Added submodule filesHEADmaster

67 files changed, 18447 insertions, 0 deletions

diff --git a/gbdk/gbdk-support/bankpack/LICENSE b/gbdk/gbdk-support/bankpack/LICENSE
new file mode 100644
index 00000000..fdddb29a
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
diff --git a/gbdk/gbdk-support/bankpack/Makefile b/gbdk/gbdk-support/bankpack/Makefile
new file mode 100644
index 00000000..635d1408
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/Makefile
@@ -0,0 +1,30 @@
+# bankcheck (auto bank tool) makefile
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+CC = $(TOOLSPREFIX)gcc
+CFLAGS = -ggdb -O -Wno-incompatible-pointer-types -DGBDKLIBDIR=\"$(TARGETDIR)\"
+OBJ = bankpack.o files.o obj_data.o list.o path_ops.o
+BIN = bankpack
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+
+clean:
+	rm -f *.o $(BIN) *~
+	rm -f *.exe
+
diff --git a/gbdk/gbdk-support/bankpack/bankpack.c b/gbdk/gbdk-support/bankpack/bankpack.c
new file mode 100644
index 00000000..8107c790
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/bankpack.c
@@ -0,0 +1,182 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+// #include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <time.h>
+
+#include "obj_data.h"
+#include "files.h"
+
+bool g_option_verbose = false;
+bool g_option_cartsize = false;
+
+static void display_help(void);
+static int handle_args(int argc, char * argv[]);
+static void option_set_verbose(bool is_enabled);
+static void init(void);
+void cleanup(void);
+
+
+static void display_help(void) {
+    fprintf(stdout,
+       "bankalloc [options] objfile1 objfile2 etc\n"
+       "Use: Read .o files and auto-assign areas with bank=255.\n"
+       "     Typically called by Lcc compiler driver before linker.\n"
+       "\n"
+       "Options\n"
+       "-h           : Show this help\n"
+       "-lkin=<file> : Load object files specified in linker file <file>\n"
+       "-lkout=<file>: Write list of object files out to linker file <file>\n"
+       "-yt<mbctype> : Set MBC type per ROM byte 149 in Decimal or Hex (0xNN) (see pandocs)\n"
+       "-mbc=N       : Similar to -yt, but sets MBC type directly to N instead\n"
+       "               of by intepreting ROM byte 149\n"
+       "               mbc1 will exclude banks {0x20,0x40,0x60} max=127, \n"
+       "               mbc2 max=15, mbc3 max=127, mbc5 max=255 (not 511!) \n"
+       "-min=N       : Min assigned ROM bank is N (default 1)\n"
+       "-max=N       : Max assigned ROM bank is N, error if exceeded\n"
+       "-ext=<.ext>  : Write files out with <.ext> instead of source extension\n"
+       "-path=<path> : Write files out to <path> (<path> *MUST* already exist)\n"
+       "-sym=<prefix>: Add symbols starting with <prefix> to match + update list.\n"
+       "               Default entry is \"___bank_\" (see below)\n"
+       "-cartsize    : Print min required cart size as \"autocartsize:<NNN>\"\n"
+       "-plat=<plat> : Select platform specific behavior (default:gb) (gb,sms)\n"
+       "-random      : Distribute banks randomly for testing (honors -min/-max)\n"
+       "-v           : Verbose output, show assignments\n"
+       "\n"
+       "Example: \"bankpack -ext=.rel -path=some/newpath/ file1.o file2.o\"\n"
+       "Unless -ext or -path specify otherwise, input files are overwritten.\n"
+       "\n"
+       "Default MBC type is not set. It *must* be specified by -mbc= or -yt!\n"
+       "\n"
+       "The following will have FF and 255 replaced with the assigned bank:\n"
+       "A _CODE_255 size <size> flags <flags> addr <address>\n"
+       "S b_<function name> Def0000FF\n"
+       "S ___bank_<const name> Def0000FF\n"
+       "    (Above can be made by: const void __at(255) __bank_<const name>;\n"
+       );
+}
+
+
+static int handle_args(int argc, char * argv[]) {
+
+    int i;
+
+    if( argc < 2 ) {
+        display_help();
+        return false;
+    }
+
+    // Start at first optional argument, argc is zero based
+    for (i = 1; i <= (argc -1); i++ ) {
+
+        if (argv[i][0] == '-') {
+            if (strstr(argv[i], "-h") == argv[i]) {
+                display_help();
+                return false;  // Don't parse input when -h is used
+            } else if (strstr(argv[i], "-min=") == argv[i]) {
+                if (!banks_set_min(atoi(argv[i] + 5))) {
+                    printf("BankPack: ERROR: Invalid min bank: %s\n", argv[i] + 5);
+                    return false;
+                }
+            } else if (strstr(argv[i], "-max=") == argv[i]) {
+                if (!banks_set_max(atoi(argv[i] + 5))) {
+                    printf("BankPack: ERROR: Invalid max bank: %s\n", argv[i] + 5);
+                    return false;
+                }
+            } else if (strstr(argv[i], "-ext=") == argv[i]) {
+                files_set_out_ext(argv[i] + 5);
+            } else if (strstr(argv[i], "-path=") == argv[i]) {
+                files_set_out_path(argv[i] + 6);
+            } else if (strstr(argv[i], "-mbc=") == argv[i]) {
+                banks_set_mbc(atoi(argv[i] + 5));
+            } else if (strstr(argv[i], "-yt") == argv[i]) {
+                banks_set_mbc_by_rom_byte_149(strtol(argv[i] + 3, NULL, 0));
+            } else if (strstr(argv[i], "-v") == argv[i]) {
+                option_set_verbose(true);
+            } else if (strstr(argv[i], "-sym=") == argv[i]) {
+                symbol_match_add(argv[i] + 5);
+            } else if (strstr(argv[i], "-cartsize") == argv[i]) {
+                g_option_cartsize = true;
+            } else if (strstr(argv[i], "-plat=") == argv[i]) {
+                banks_set_platform(argv[i] + 6);
+            } else if (strstr(argv[i], "-random") == argv[i]) {
+                banks_set_random(true);
+            } else if (strstr(argv[i], "-lkin=") == argv[i]) {
+                files_read_linkerfile(argv[i] + strlen("-lkin="));
+            } else if (strstr(argv[i], "-lkout=") == argv[i]) {
+                files_set_linkerfile_outname(argv[i] + strlen("-lkout="));
+            } else
+                printf("BankPack: Warning: Ignoring unknown option %s\n", argv[i]);
+        } else {
+            // Add to list of object files to process
+            files_add(argv[i]);
+        }
+    }
+
+    return true;
+}
+
+
+static void option_set_verbose(bool is_enabled) {
+    g_option_verbose = is_enabled;
+}
+
+
+static int matches_extension(char * filename, char * extension) {
+    return (strcmp(filename + (strlen(filename) - strlen(extension)), extension) == 0);
+}
+
+
+static void init(void) {
+    srand( time(0) );
+    files_init();
+    obj_data_init();
+}
+
+
+void cleanup(void) {
+    files_cleanup();
+    obj_data_cleanup();
+}
+
+
+int main( int argc, char *argv[] )  {
+
+    // Exit with failure by default
+    int ret = EXIT_FAILURE;
+
+    // Register cleanup with exit handler
+    atexit(cleanup);
+
+    init();
+
+    if (handle_args(argc, argv)) {
+
+        // Require MBC for Game Boy
+        // SMS doesn't require an MBC setting
+        if ((banks_get_platform() == PLATFORM_GB) && (banks_get_mbc_type() == MBC_TYPE_NONE))
+            printf("BankPack: ERROR: auto-banking does not work with unbanked ROMS (no MBC for Game Boy)\n");
+        else {
+            // Extract areas, sort and assign them to banks
+            // then rewrite object files as needed
+            files_extract();
+            files_rewrite();
+
+            if (g_option_verbose)
+                banks_show();
+            if (g_option_cartsize)
+                fprintf(stdout,"autocartsize:%d\n",banks_calc_cart_size());
+
+            cleanup();
+            ret = EXIT_SUCCESS;
+        }
+    }
+
+    return ret; // Exit with failure by default
+}
\ No newline at end of file
diff --git a/gbdk/gbdk-support/bankpack/common.h b/gbdk/gbdk-support/bankpack/common.h
new file mode 100644
index 00000000..43235216
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/common.h
@@ -0,0 +1,38 @@
+
+#ifndef _COMMON_H
+#define _COMMON_H
+
+enum {
+    MBC_TYPE_NONE = 0,
+    MBC_TYPE_MBC1 = 1,
+    MBC_TYPE_MBC2 = 2,
+    MBC_TYPE_MBC3 = 3,
+    /* MBC4 doesn't exist */
+    MBC_TYPE_MBC5 = 5,
+
+    MBC_TYPE_MIN = MBC_TYPE_MBC1,
+    MBC_TYPE_MAX = MBC_TYPE_MBC5,
+    MBC_TYPE_DEFAULT =  MBC_TYPE_NONE
+};
+
+#define MAX_FILE_STR 2048
+
+#define BANK_NUM_UNASSIGNED   0xFFFFU
+#define BANK_NUM_AUTO         255
+#define BANK_NUM_ROM_MIN      1
+#define BANK_NUM_ROM_MAX      255
+#define BANK_ROM_TOTAL        256 // Banks 0-255
+#define BANK_ROM_CALC_MAX     512 // Banks 0-512 (>256 not supported for auto-banking right now)
+#define BANK_SIZE_ROM         0x4000U
+
+#define BANK_ITEM_COUNT_MAX 0xFFFF
+
+#define BANK_NUM_ROM_MAX_MBC1  127
+#define BANK_NUM_ROM_MAX_MBC2  15
+#define BANK_NUM_ROM_MAX_MBC3  127
+#define BANK_NUM_ROM_MAX_MBC5  255 // 511 // TODO: support full MBC5 address range (currently 8 bit only)
+
+#define STRINGIFY(x) #x
+#define TOSTR(x) STRINGIFY(x)
+
+#endif // _COMMON_H
diff --git a/gbdk/gbdk-support/bankpack/files.c b/gbdk/gbdk-support/bankpack/files.c
new file mode 100644
index 00000000..30574462
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/files.c
@@ -0,0 +1,284 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#include "common.h"
+#include "path_ops.h"
+#include "list.h"
+#include "files.h"
+#include "obj_data.h"
+
+static void files_set_output_name(void);
+static char * file_read_to_buffer(char *);
+
+list_type filelist;
+
+char g_out_ext[MAX_FILE_STR];
+char g_out_path[MAX_FILE_STR];
+char g_out_linkerfile_name[MAX_FILE_STR] = {'\0'};
+
+void files_set_out_ext(char * ext_str) {
+    if (snprintf(g_out_ext, sizeof(g_out_ext), "%s", ext_str) > sizeof(g_out_ext))
+        printf("Bankpack: Warning: truncated output extension to:%s\n",g_out_ext);
+}
+
+void files_set_out_path(char * path_str) {
+    if (snprintf(g_out_path, sizeof(g_out_path), "%s", path_str) > sizeof(g_out_path))
+        printf("Bankpack: Warning: truncated output path to:%s\n",g_out_path);
+}
+
+
+void files_init(void) {
+    list_init(&filelist, sizeof(file_item));
+    g_out_ext[0]  = '\0';
+    g_out_path[0] = '\0';
+}
+
+void files_cleanup(void) {
+    list_cleanup(&filelist);
+}
+
+
+// Reads a list of object files from a linkerfile
+// (one filename per line) and adds them
+void files_read_linkerfile(char * filename_in) {
+    char strline_in[MAX_FILE_STR] = "";
+
+    FILE * in_file;
+
+    // Open each object file and try to process all the lines
+    in_file = fopen(filename_in, "r");
+    if (in_file) {
+
+        // Read one line at a time into \0 terminated string
+        // Skip empty lines
+        // Strip newlines and carraige returns from end of filename
+        while ( fgets(strline_in, sizeof(strline_in), in_file) != NULL) {
+            if ((strline_in[0] != '\n') || (strline_in[0] != '\r')) {
+                strline_in[strcspn(strline_in, "\r\n")] = '\0';
+                files_add(strline_in);
+            }
+        }
+        fclose(in_file);
+
+    } // end: if valid file
+    else {
+        printf("BankPack: ERROR: failed to open input linkerfile: %s\n", filename_in);
+        exit(EXIT_FAILURE);
+    }
+}
+
+
+void files_set_linkerfile_outname(char * filename) {
+
+    if (snprintf(g_out_linkerfile_name, sizeof(g_out_linkerfile_name), "%s", filename) > sizeof(g_out_linkerfile_name))
+        printf("Warning: truncated output linkerfile name to:%s\n",g_out_linkerfile_name);
+}
+
+
+// Writes a list of loaded object filenames to
+// a linkerfile (one filename per line)
+void files_write_linkerfile(void) {
+    uint32_t c;
+    file_item * files = (file_item *)filelist.p_array;
+    FILE * out_file;
+
+    // Open the linkerfile output and write all object filenames
+    out_file = fopen(g_out_linkerfile_name, "w");
+    if (out_file) {
+
+        // Process stored file names
+        for (c = 0; c < filelist.count; c++)
+            fprintf(out_file, "%s\n", files[c].name_out);
+
+        fclose(out_file);
+
+    } // end: if valid file
+    else {
+        printf("BankPack: ERROR: failed to open output linkerfile: %s\n", g_out_linkerfile_name);
+        exit(EXIT_FAILURE);
+    }
+}
+
+
+void files_add(char * filename) {
+
+    file_item newfile;
+
+    if (snprintf(newfile.name_in, sizeof(newfile.name_in), "%s", filename) > sizeof(newfile.name_in))
+        printf("Warning: truncated input filename to:%s\n",newfile.name_in);
+
+    newfile.name_out[0] = '\0';
+    newfile.rewrite_needed = false;
+    newfile.bank_num = BANK_NUM_UNASSIGNED;
+
+    list_additem(&filelist, &newfile);
+}
+
+
+char * file_get_name_in_by_id(uint32_t file_id) {
+
+    file_item * files = (file_item *)filelist.p_array;
+
+    if ((file_id >= 0) && (file_id < filelist.count))
+        return files[file_id].name_in;
+    else
+        return (char *)"\0";
+}
+
+
+char * file_get_name_out_by_id(uint32_t file_id) {
+
+    file_item * files = (file_item *)filelist.p_array;
+
+    if ((file_id >= 0) && (file_id < filelist.count))
+        return files[file_id].name_out;
+    else
+        return (char *)"\0";
+}
+
+
+// Update output names based on -path= and -ext= option params
+static void files_set_output_name(void) {
+
+    uint32_t c;
+    file_item * files = (file_item *)filelist.p_array;
+
+    // Process stored file names
+    for (c = 0; c < filelist.count; c++) {
+
+        snprintf(files[c].name_out, sizeof(files[c].name_out), "%s", files[c].name_in);
+
+        if (g_out_ext[0])
+            filename_replace_extension(files[c].name_out, g_out_ext, sizeof(files[c].name_out));
+        if (g_out_path[0])
+            filename_replace_path(files[c].name_out, g_out_path, sizeof(files[c].name_out));
+    }
+}
+
+
+// Read from a file into a buffer (will allocate needed memory)
+// Returns NULL if reading file didn't succeed
+static char * file_read_to_buffer(char * filename) {
+
+    long fsize;
+    FILE * file_in = fopen(filename, "rb");
+    char * filedata = NULL;
+
+    if (file_in) {
+        // Get file size
+        fseek(file_in, 0, SEEK_END);
+        fsize = ftell(file_in);
+        if (fsize != -1L) {
+            fseek(file_in, 0, SEEK_SET);
+
+            filedata = malloc(fsize + 1); // One extra byte to add string null terminator
+            if (filedata) {
+                if (fsize != fread(filedata, 1, fsize, file_in))
+                    printf("BankPack: Warning: File read size didn't match expected for %s\n", filename);
+                filedata[fsize] = '\0'; // Add null string terminator at end
+            } else printf("BankPack: ERROR: Failed to allocate memory to read file %s\n", filename);
+
+        } else printf("BankPack: ERROR: Failed to read size of file %s\n", filename);
+
+        fclose(file_in);
+    } else printf("BankPack: ERROR: Failed to open input file %s\n", filename);
+
+    return filedata;
+}
+
+
+// Extract areas from files, then collected assign them to banks
+void files_extract(void) {
+    uint32_t c;
+    char strline_in[OBJ_NAME_MAX_STR_LEN] = "";
+    file_item * files = (file_item *)filelist.p_array;
+    FILE * obj_file;
+
+    // Process stored file names
+    for (c = 0; c < filelist.count; c++) {
+
+        // Open each object file and try to process all the lines
+        obj_file = fopen(files[c].name_in, "r");
+        if (obj_file) {
+
+            // Read one line at a time into \0 terminated string
+            while ( fgets(strline_in, sizeof(strline_in), obj_file) != NULL) {
+                if (strline_in[0] == 'A')
+                    areas_add(strline_in, c);
+                else if (strline_in[0] == 'S')
+                    symbols_add(strline_in, c);
+            }
+            fclose(obj_file);
+
+        } // end: if valid file
+        else {
+            printf("BankPack: ERROR: failed to open file %s\n", files[c].name_in);
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    obj_data_process(&filelist);
+    files_set_output_name();
+}
+
+
+void files_rewrite(void) {
+
+    uint32_t c;
+    char * in_file_buf = NULL;
+    char * strline_in  = NULL;
+    FILE * out_file    = NULL;
+    file_item * files  = (file_item *)filelist.p_array;
+
+    // If linkerfile output is enabled, write it
+    if (g_out_linkerfile_name[0] != '\0')
+        files_write_linkerfile();
+
+    // Process stored file names - (including unchanged ones since output may get new extensions or path)
+    for (c = 0; c < filelist.count; c++) {
+
+        in_file_buf = file_read_to_buffer(files[c].name_in);
+        if (!in_file_buf)
+            exit(EXIT_FAILURE);
+
+        out_file = fopen(files[c].name_out, "w");
+        if (!out_file) {
+            printf("BankPack: ERROR: failed to open output file %s\n", files[c].name_out);
+            exit(EXIT_FAILURE);
+        }
+
+        // Read one line at a time from a string buffer
+        // Note: strtok will replace the \n chars with \0 on each split, so be sure to add those back
+        strline_in = strtok(in_file_buf,"\n");
+        while (strline_in != NULL) {
+
+            // Only modify lines in flagged files
+            if (files[c].rewrite_needed) {
+
+                if (!area_modify_and_write_to_file(strline_in, out_file, files[c].bank_num)) {
+                    if (!symbol_modify_and_write_to_file(strline_in, out_file, files[c].bank_num, c)) {
+                        // Default is to write line with no changes
+                        fprintf(out_file, "%s\n", strline_in);
+                    }
+                }
+            } else
+                fprintf(out_file, "%s\n", strline_in);
+
+            // Read next line
+            strline_in = strtok(NULL,"\n");
+        }
+
+        if (in_file_buf)
+            free(in_file_buf);
+        fclose(out_file);
+    }
+
+}
diff --git a/gbdk/gbdk-support/bankpack/files.h b/gbdk/gbdk-support/bankpack/files.h
new file mode 100644
index 00000000..267c7d61
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/files.h
@@ -0,0 +1,35 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _FILES_H
+#define _FILES_H
+
+#include "common.h"
+
+typedef struct file_item {
+    char     name_in[MAX_FILE_STR];
+    uint16_t bank_num;
+    bool     rewrite_needed;
+    char     name_out[MAX_FILE_STR];
+} file_item;
+
+
+void files_init(void);
+void files_cleanup(void);
+void files_add(char *);
+
+void files_read_linkerfile(char *);
+void files_set_linkerfile_outname(char *);
+void files_write_linkerfile(void);
+
+char * file_get_name_in_by_id(uint32_t);
+char * file_get_name_out_by_id(uint32_t);
+
+void files_set_out_ext(char *);
+void files_set_out_path(char *);
+
+void files_extract(void);
+void files_rewrite(void);
+
+#endif // _FILES_H
diff --git a/gbdk/gbdk-support/bankpack/list.c b/gbdk/gbdk-support/bankpack/list.c
new file mode 100644
index 00000000..1a382357
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/list.c
@@ -0,0 +1,66 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "list.h"
+
+#define LIST_GROW_SIZE 50 // grow array by N entries at a time
+
+// Initialize the list and it's array
+// typesize *must* match the type that will be used with the array
+void list_init(list_type * p_list, size_t array_typesize) {
+    p_list->typesize = array_typesize;
+    p_list->count   = 0;
+    p_list->size    = LIST_GROW_SIZE;
+    p_list->p_array = (void *)malloc(p_list->size * p_list->typesize);
+
+    if (!p_list->p_array) {
+        printf("BankPack: ERROR: Failed to allocate memory for list!\n");
+        exit(EXIT_FAILURE);
+    }
+}
+
+
+// Free the array memory allocated for the list
+void list_cleanup(list_type * p_list) {
+    if (p_list->p_array) {
+        free (p_list->p_array);
+        p_list->p_array = NULL;
+    }
+}
+
+
+// Add a new item to the lists array, resize if needed
+// p_newitem *must* be the same type the list was initialized with
+void list_additem(list_type * p_list, void * p_newitem) {
+
+    void * tmp_list;
+
+    p_list->count++;
+
+    // Grow array if needed
+    if (p_list->count == p_list->size) {
+        // Save a copy in case reallocation fails
+        tmp_list = p_list->p_array;
+
+        p_list->size += p_list->typesize * LIST_GROW_SIZE;
+        p_list->p_array = (void *)realloc(p_list->p_array, p_list->size * p_list->typesize);
+        // If realloc failed, free original buffer before quitting
+        if (!p_list->p_array) {
+            printf("BankPack: ERROR: Failed to reallocate memory for list!\n");
+            if (tmp_list) free(tmp_list);
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    // Copy new entry
+    memcpy(p_list->p_array + ((p_list->count - 1) * p_list->typesize),
+           p_newitem,
+           p_list->typesize);
+}
+
diff --git a/gbdk/gbdk-support/bankpack/list.h b/gbdk/gbdk-support/bankpack/list.h
new file mode 100644
index 00000000..ef9d3d52
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/list.h
@@ -0,0 +1,20 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _LIST_H
+#define _LIST_H
+
+
+typedef struct list_type {
+    void *   p_array;
+    uint32_t size;
+    uint32_t count;
+    size_t   typesize;
+} list_type;
+
+void list_init(list_type *, size_t);
+void list_cleanup(list_type *);
+void list_additem(list_type *, void *);
+
+#endif // _LIST_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/bankpack/obj_data.c b/gbdk/gbdk-support/bankpack/obj_data.c
new file mode 100644
index 00000000..88adf014
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/obj_data.c
@@ -0,0 +1,762 @@
+
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "common.h"
+#include "list.h"
+#include "files.h"
+#include "obj_data.h"
+
+
+static bool bank_check_mbc1_ok(uint32_t bank_num);
+static void bank_update_assigned_minmax(uint16_t bank_num);
+static void bank_update_all_max(uint16_t bank_num);
+static void bank_add_area(bank_item * p_bank, uint16_t bank_num, area_item * p_area);
+static void bank_check_area_size(area_item * p_area);
+static void banks_assign_area(area_item * p_area);
+static int area_item_compare(const void* a, const void* b);
+static void areas_sort(void);
+static bool symbol_banked_check_rewrite_ok(char *, uint32_t);
+
+extern bool g_option_verbose;
+
+
+list_type banklist;
+list_type arealist;
+list_type symbollist;
+list_type symbol_matchlist;
+
+uint16_t bank_limit_rom_min = BANK_NUM_ROM_MIN;
+uint16_t bank_limit_rom_max = BANK_NUM_ROM_MAX;
+
+
+uint16_t bank_assign_rom_min = BANK_NUM_ROM_MAX;
+uint16_t bank_assign_rom_max = 0;
+uint16_t bank_all_rom_max = 0;
+
+int g_mbc_type = MBC_TYPE_DEFAULT;
+int g_platform = PLATFORM_DEFAULT;
+bool g_opt_random_assign = false;
+
+
+int banks_get_platform(void) {
+    return g_platform;
+}
+
+void banks_set_platform(char * platform_str) {
+
+    if (strcmp(platform_str, PLATFORM_STR_GB) == 0)
+        g_platform = PLATFORM_GB;
+    else if (strcmp(platform_str, PLATFORM_STR_AP) == 0)
+        g_platform = PLATFORM_GB;  // Analogue Pocket uses GB platform
+    else if (strcmp(platform_str, PLATFORM_STR_DUCK) == 0)
+        g_platform = PLATFORM_GB;  // Megaduck uses GB platform
+    else if (strcmp(platform_str, PLATFORM_STR_SMS) == 0)
+        g_platform = PLATFORM_SMS;
+    else if (strcmp(platform_str, PLATFORM_STR_GG) == 0)
+        g_platform = PLATFORM_SMS; // GG uses SMS platform
+    else if (strcmp(platform_str, PLATFORM_STR_MSXDOS) == 0)
+        g_platform = PLATFORM_SMS; // MSXDOS uses SMS platform
+    else
+        printf("BankPack: Warning: Invalid platform option %s\n", platform_str);
+}
+
+
+
+int banks_get_mbc_type(void) {
+    return g_mbc_type;
+}
+
+
+// Set MBC type by interpreting from byte 149
+//
+//  For lcc linker option: -Wl-ytN where N is one of the numbers below
+//  (from makebin.c in SDCC)
+//
+//  ROM Byte 0147: Cartridge type:
+//  0-ROM ONLY            12-ROM+MBC3+RAM
+//  1-ROM+MBC1            13-ROM+MBC3+RAM+BATT
+//  2-ROM+MBC1+RAM        19-ROM+MBC5
+//  3-ROM+MBC1+RAM+BATT   1A-ROM+MBC5+RAM
+//  5-ROM+MBC2            1B-ROM+MBC5+RAM+BATT
+//  6-ROM+MBC2+BATTERY    1C-ROM+MBC5+RUMBLE
+//  8-ROM+RAM             1D-ROM+MBC5+RUMBLE+SRAM
+//  9-ROM+RAM+BATTERY     1E-ROM+MBC5+RUMBLE+SRAM+BATT
+//  B-ROM+MMM01           1F-Pocket Camera
+//  C-ROM+MMM01+SRAM      FD-Bandai TAMA5
+//  D-ROM+MMM01+SRAM+BATT FE - Hudson HuC-3
+//  F-ROM+MBC3+TIMER+BATT FF - Hudson HuC-1
+//  10-ROM+MBC3+TIMER+RAM+BATT
+//  11-ROM+MBC3
+void banks_set_mbc_by_rom_byte_149(int mbc_type_rom_byte) {
+
+    switch (mbc_type_rom_byte) {
+        // NO MBC
+        case 0x00U: //  0-ROM ONLY
+        case 0x08U: //  2-ROM+MBC1+RAM
+        case 0x09U: //  8-ROM+RAM
+        case 0x0BU: //  B-ROM+MMM01
+        case 0x0CU: //  C-ROM+MMM01+SRAM
+        case 0x0DU: //  D-ROM+MMM01+SRAM+BATT
+            banks_set_mbc(MBC_TYPE_NONE);
+            break;
+
+        // MBC 1
+        case 0x01U: //  1-ROM+MBC1
+        case 0x02U: //  2-ROM+MBC1+RAM
+        case 0x03U: //  3-ROM+MBC1+RAM+BATT
+            banks_set_mbc(MBC_TYPE_MBC1);
+            break;
+
+        // MBC 2
+        case 0x05U: //  5-ROM+MBC2
+        case 0x06U: //  6-ROM+MBC2+BATTERY
+            banks_set_mbc(MBC_TYPE_MBC2);
+            break;
+
+        // MBC 3
+        case 0x0FU: //  F-ROM+MBC3+TIMER+BATT
+        case 0x10U: //  10-ROM+MBC3+TIMER+RAM+BATT
+        case 0x11U: //  11-ROM+MBC3
+        case 0x12U: //  12-ROM+MBC3+RAM
+        case 0x13U: //  13-ROM+MBC3+RAM+BATT
+            banks_set_mbc(MBC_TYPE_MBC3);
+            break;
+
+        // MBC 5
+        case 0x19U: //  19-ROM+MBC5
+        case 0x1AU: //  1A-ROM+MBC5+RAM
+        case 0x1BU: //  1B-ROM+MBC5+RAM+BATT
+        case 0x1CU: //  1C-ROM+MBC5+RUMBLE
+        case 0x1DU: //  1D-ROM+MBC5+RUMBLE+SRAM
+        case 0x1EU: //  1E-ROM+MBC5+RUMBLE+SRAM+BATT
+            banks_set_mbc(MBC_TYPE_MBC5);
+            break;
+
+        default:
+            printf("BankPack: Warning: unrecognized MBC option -yt=%x\n", mbc_type_rom_byte);
+            break;
+    }
+}
+
+
+// Set MBC type directly
+void banks_set_mbc(int mbc_type) {
+
+    uint16_t mbc_bank_limit_rom_max;
+
+    switch (mbc_type) {
+        case MBC_TYPE_NONE:
+            g_mbc_type = MBC_TYPE_NONE;
+            break;
+        case MBC_TYPE_MBC1:
+            g_mbc_type = mbc_type;
+            mbc_bank_limit_rom_max = BANK_NUM_ROM_MAX_MBC1;
+            break;
+        case MBC_TYPE_MBC2:
+            g_mbc_type = mbc_type;
+            mbc_bank_limit_rom_max = BANK_NUM_ROM_MAX_MBC2;
+            break;
+        case MBC_TYPE_MBC3:
+            g_mbc_type = mbc_type;
+            mbc_bank_limit_rom_max = BANK_NUM_ROM_MAX_MBC3;
+            break;
+        case MBC_TYPE_MBC5:
+            g_mbc_type = mbc_type;
+            mbc_bank_limit_rom_max = BANK_NUM_ROM_MAX_MBC5;
+            break;
+        default:
+            printf("BankPack: Warning: unrecognized MBC option -mbc%d!\n", mbc_type);
+            break;
+    }
+    if (mbc_bank_limit_rom_max < bank_limit_rom_max)
+        bank_limit_rom_max = mbc_bank_limit_rom_max;
+}
+
+
+
+// From makebin
+//  Byte
+//  0148 - ROM size             -yt<N>
+//  0    - 256Kbit = 32KByte  =   2 banks
+//  1    - 512Kbit = 64KByte  =   4 banks
+//  2    - 1Mbit   = 128KByte =   8 banks
+//  3    - 2Mbit   = 256KByte =  16 banks
+//  4    - 4Mbit   = 512KByte =  32 banks
+//  5    - 8Mbit   = 1MByte   =  64 banks
+//  6    - 16Mbit  = 2MByte   = 128 banks
+//  7    - 16Mbit  = 2MByte   = 256 banks
+//  8    - 16Mbit  = 2MByte   = 512 banks
+//
+//  Not supported by makebin:
+//  $52 - 9Mbit = 1.1MByte = 72 banks
+//  $53 - 10Mbit = 1.2MByte = 80 banks
+//  $54 - 12Mbit = 1.5MByte = 96 banks
+uint32_t banks_calc_cart_size(void) {
+
+    uint32_t req_banks = 1;
+
+    if ((bank_all_rom_max + 1) > BANK_ROM_CALC_MAX) {
+        printf("BankPack: Warning! Can't calc cart size, too many banks: %d (max %d)\n", (bank_all_rom_max + 1), BANK_ROM_CALC_MAX);
+        return (0);
+    }
+
+    // Calculate nearest upper power of 2
+    while (req_banks < (bank_all_rom_max + 1))
+        req_banks *= 2;
+
+    return (req_banks);
+}
+
+
+bool banks_set_min(uint16_t bank_num) {
+    if (bank_num < BANK_NUM_ROM_MIN)
+        return false;
+    else bank_limit_rom_min = bank_num;
+
+    return true;
+}
+
+bool banks_set_max(uint16_t bank_num) {
+    if (bank_num > BANK_NUM_ROM_MAX)
+        return false;
+    else bank_limit_rom_max = bank_num;
+
+    return true;
+}
+
+
+void banks_set_random(bool is_random) {
+    g_opt_random_assign = is_random;
+}
+
+
+
+void obj_data_init(void) {
+    int c;
+    bank_item newbank;
+
+    list_init(&banklist,      sizeof(bank_item));
+    list_init(&arealist,      sizeof(area_item));
+    list_init(&symbollist,    sizeof(symbol_item));
+    list_init(&symbol_matchlist, sizeof(symbol_match_item));
+
+    // Pre-populate bank list with max number of of banks
+    // to allow handling fixed-bank (non-autobank) areas
+    newbank.size = newbank.free = BANK_SIZE_ROM;
+    newbank.type = BANK_TYPE_UNSET;
+    newbank.item_count = 0;
+    for (c=0; c < BANK_ROM_TOTAL; c++)
+        list_additem(&banklist, &newbank);
+
+    // Add default symbol match and replace
+    symbol_match_add("___bank_");
+}
+
+
+void obj_data_cleanup(void) {
+    list_cleanup(&banklist);
+    list_cleanup(&arealist);
+    list_cleanup(&symbollist);
+    list_cleanup(&symbol_matchlist);
+}
+
+
+// Add a symbol to the match and replace list
+void symbol_match_add(char * symbol_str) {
+
+    symbol_match_item newmatch;
+
+    if (snprintf(newmatch.name, sizeof(newmatch.name), "%s", symbol_str) > sizeof(newmatch.name))
+        printf("BankPack: Warning: truncated symbol match string to:%s\n",newmatch.name);
+
+    list_additem(&symbol_matchlist, &newmatch);
+}
+
+
+
+// Add an area into the pool of areas to assign (if it's banked CODE)
+int areas_add(char * area_str, uint32_t file_id) {
+
+    area_item newarea;
+
+    // Only match areas which are banked ("_CODE_" vs "_CODE") and ("_LIT_")
+    if (AREA_LINE_RECORDS == sscanf(area_str,"A _CODE _%3d size %4x flags %*4x addr %*4x",
+                                    &newarea.bank_num_in, &newarea.size)) {
+        newarea.type = BANK_TYPE_DEFAULT;
+    }
+    else if (AREA_LINE_RECORDS == sscanf(area_str,"A _LIT_%3d size %4x flags %*4x addr %*4x",
+                                        &newarea.bank_num_in, &newarea.size)) {
+        newarea.type = BANK_TYPE_LIT_EXCLUSIVE;
+    }
+    else
+        return false;
+
+    // Only process areas with (size > 0)
+    if (newarea.size > 0) {
+        if (newarea.type == BANK_TYPE_LIT_EXCLUSIVE)
+            sprintf(newarea.name, "_LIT_");  // Hardwired to _LIT_ for now
+        else
+            sprintf(newarea.name, "_CODE_"); // Hardwired to _CODE_ for now
+        newarea.file_id = file_id;
+        newarea.bank_num_out = BANK_NUM_UNASSIGNED;
+        list_additem(&arealist, &newarea);
+        return true;
+    } else
+        return false;
+}
+
+
+// Add an area into the pool of areas to assign (if it's banked CODE)
+int symbols_add(char * symbol_str, uint32_t file_id) {
+
+    symbol_item newsymbol;
+
+     if (SYMBOL_LINE_RECORDS == sscanf(symbol_str,"S %" TOSTR(OBJ_NAME_MAX_STR_LEN) "s Def00%4x",
+                                       newsymbol.name, &newsymbol.bank_num_in)) {
+
+        // Symbols that start with b_ store the bank num for the matching symbol without 'b'
+        newsymbol.is_banked_def          = (newsymbol.name[0] == 'b');
+        newsymbol.file_id                = file_id;
+        newsymbol.found_matching_symbol  = false;
+
+        // Don't add banked symbols if they're not set to the autobank bank #
+        if ((newsymbol.is_banked_def) && (newsymbol.bank_num_in != BANK_NUM_AUTO))
+            return false;
+
+        list_additem(&symbollist, &newsymbol);
+        return true;
+    }
+    return false;
+}
+
+
+// Track Min/Max assigned banks used
+static void bank_update_assigned_minmax(uint16_t bank_num) {
+
+    if (bank_num > bank_assign_rom_max)
+        bank_assign_rom_max = bank_num;
+
+    if (bank_num < bank_assign_rom_min)
+        bank_assign_rom_min = bank_num;
+
+    bank_update_all_max(bank_num);
+}
+
+
+// Tracks Max bank for *all* banks used, including fixed banks outside max limits
+static void bank_update_all_max(uint16_t bank_num) {
+
+    if (bank_num > bank_all_rom_max)
+        bank_all_rom_max = bank_num;
+}
+
+
+// Add an area to a bank.
+// It should only error out when there isn't enough
+// room with a fixed-bank area (non-autobank)
+static void bank_add_area(bank_item * p_bank, uint16_t bank_num, area_item * p_area) {
+
+    // Make sure there is room and then update free space
+    if (p_area->size > p_bank->free) {
+
+        // Trying to add an auto-bank area to a full bank should be prevented by previous tests, but just in case
+        if (p_area->bank_num_in == BANK_NUM_AUTO) {
+            printf("BankPack: ERROR! Auto-banked Area %s, bank %d, size %d won't fit in assigned bank %d (free %d)\n",
+                    p_area->name, p_area->bank_num_in, p_area->size, bank_num, p_bank->free);
+            exit(EXIT_FAILURE);
+        } else {
+            // Only warn for fixed bank areas. Don't exit and add the area anyway
+            printf("BankPack: Warning: Fixed-bank Area %s, bank %d, size %d won't fit in assigned bank %d (free %d)\n",
+                    p_area->name, p_area->bank_num_in, p_area->size, bank_num, p_bank->free);
+        }
+
+        // Force bank space to zero, subtracting at this point would overflow
+        p_bank->free = 0;
+    } else
+        p_bank->free -= p_area->size;
+
+    // Copy bank type from area: some platforms (sms) don't allow mixing of area types in the same bank
+    // Assign outbound bank number for the area
+    p_bank->type = p_area->type;
+    p_bank->item_count++;
+    p_area->bank_num_out = bank_num;
+    bank_update_assigned_minmax(bank_num);
+}
+
+
+// Check to see if the specified bank is allowed with MBC1
+static bool bank_check_mbc1_ok(uint32_t bank_num) {
+
+    if ((bank_num == 0x20U) || (bank_num == 0x40U) || (bank_num == 0x60U))
+        return false;
+    else
+        return true;
+}
+
+
+// Checks to make sure area size is not larger than an entire bank
+static void bank_check_area_size(area_item * p_area) {
+    if (p_area->size > BANK_SIZE_ROM) {
+        printf("BankPack: ERROR! Area %s, bank %d, size %d is too large for bank size %d (file %s)\n",
+                p_area->name, p_area->bank_num_in, p_area->size, BANK_SIZE_ROM, file_get_name_in_by_id(p_area->file_id));
+        exit(EXIT_FAILURE);
+    }
+}
+
+
+// Display a error message about bank mixing
+static void bank_report_mixed_area_error(bank_item * p_bank, uint16_t bank_num, area_item * p_area) {
+
+    printf("BankPack: ERROR! Bank %d already assigned different area type.\n"
+           "  Can't mix _CODE_ and _LIT_ areas in the same bank for this platform.\n"
+           "  Area %s, bank %d, file:%s\n",
+           p_area->bank_num_in, p_area->name, bank_num, file_get_name_in_by_id(p_area->file_id));
+
+    if (g_option_verbose)
+        banks_show();
+}
+
+
+// Checks whether mixing area types in the same bankshould be rejected
+static bool bank_check_mixed_area_types_ok(bank_item * p_bank, uint16_t bank_num, area_item * p_area) {
+
+    // Don't allow mixing of _CODE_ and _LIT_ for sms/gg ports
+    // If one type has already been assigned to the bank, lock others out
+    if ((g_platform == PLATFORM_SMS) &&
+        (p_bank->type != BANK_TYPE_UNSET) &&
+        (p_area->type != p_bank->type))
+        return false;
+    else
+        return true;
+}
+
+
+// Verify that a bank is available for an area
+// Checks: Size, MBC Availability, Mixed area restrictions
+static bool bank_check_ok_for_area(uint16_t bank_num, area_item * p_area, bank_item * banks) {
+
+    // Check for MBC bank restrictions
+    if ((g_mbc_type != MBC_TYPE_MBC1) || (bank_check_mbc1_ok(bank_num))) {
+        // Check for allowed area mixing if needed
+        if (bank_check_mixed_area_types_ok(&banks[bank_num], bank_num, p_area)) {
+            // Make sure there is enough space for the area
+            if (p_area->size <= banks[bank_num].free) {
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+
+// Assign areas randomly and distributed as sparsely as possible
+static bool banks_assign_area_random(area_item * p_area, bank_item * banks) {
+
+    uint16_t bank_num;
+    uint16_t item_count_min = BANK_ITEM_COUNT_MAX;
+    uint16_t list_of_banks[BANK_ROM_TOTAL];
+    uint16_t list_count = 0;
+
+    // Find lowest number of areas per bank among banks which have sufficient space for the area
+    for (bank_num = bank_limit_rom_min; bank_num <= bank_limit_rom_max; bank_num++)
+        if ((banks[bank_num].item_count < item_count_min) && bank_check_ok_for_area(bank_num, p_area, banks))
+            item_count_min = banks[bank_num].item_count;
+
+    // Now make a list of suitable banks below that threshold
+    for (bank_num = bank_limit_rom_min; bank_num <= bank_limit_rom_max; bank_num++)
+        if ((banks[bank_num].item_count <= item_count_min) && bank_check_ok_for_area(bank_num, p_area, banks))
+            list_of_banks[list_count++] = bank_num;
+
+    if (list_count > 0) {
+        // Choose a random bank from the selected banks and add the area to it
+        bank_num = list_of_banks[ rand() % list_count ];
+        bank_add_area(&banks[bank_num], bank_num, p_area);
+
+        return true;
+    } else
+        return false; // Fail if no banks were available
+}
+
+
+// Assign areas linearly, trying to fill up lowest banks first
+static bool banks_assign_area_linear(area_item * p_area, bank_item * banks) {
+
+    uint16_t bank_num;
+
+    // Try to assign area to first allowed bank with enough free space
+    // Bank array index maps directly to bank numbers, so [2] will be _CODE_2
+    for (bank_num = bank_limit_rom_min; bank_num <= bank_limit_rom_max; bank_num++) {
+        if (bank_check_ok_for_area(bank_num, p_area, banks)) {
+            bank_add_area(&banks[bank_num], bank_num, p_area);
+            return true;
+        }
+    }
+    return false; // Fail if no banks were available
+}
+
+
+// Find a bank for a given area using First Fit Decreasing (FFD)
+// All possible banks (0-255) were pre-created and initialized [in obj_data_init()],
+// so there is no need to add when using a fresh bank
+static void banks_assign_area(area_item * p_area) {
+
+    uint16_t bank_num;
+    bank_item * banks = (bank_item *)banklist.p_array;
+    bool result;
+
+    bank_check_area_size(p_area);
+
+    // Try to assign fixed bank areas to their expected bank.
+    // (ignore the area if it's outside the processing range)
+    if (p_area->bank_num_in != BANK_NUM_AUTO) {
+
+        bank_num = p_area->bank_num_in;
+
+        // Update max bank var that tracks regardless of limits
+        // For auto banks this will get updated via bank_add_area()
+        bank_update_all_max(bank_num);
+
+        if ((bank_num >= bank_limit_rom_min) &&
+            (bank_num <= bank_limit_rom_max)) {
+
+            if ((g_mbc_type == MBC_TYPE_MBC1) && (!bank_check_mbc1_ok(bank_num)))
+                printf("BankPack: Warning: Area in fixed bank assigned to MBC1 excluded bank: %d, file: %s\n", bank_num, file_get_name_in_by_id(p_area->file_id));
+
+            if (!bank_check_mixed_area_types_ok(&banks[bank_num], bank_num, p_area)) {
+                bank_report_mixed_area_error(&banks[bank_num], bank_num, p_area);
+                exit(EXIT_FAILURE);
+            }
+
+            bank_add_area(&banks[bank_num], bank_num, p_area);
+        }
+        //else
+        //    printf("BankPack: Notice: Ignoring Area in fixed bank %d outside specified range %d - %d, file: %s\n", bank_num, bank_limit_rom_min, bank_limit_rom_max, file_get_name_in_by_id(p_area->file_id));
+
+        return;
+    }
+    else if (p_area->bank_num_in == BANK_NUM_AUTO) {
+
+        if (g_opt_random_assign)
+            result = banks_assign_area_random(p_area, banks);
+        else
+            result = banks_assign_area_linear(p_area, banks);
+
+        if (result) // Success
+            return;
+    }
+
+    if (g_option_verbose)
+        banks_show();
+    printf("BankPack: ERROR! Failed to assign bank for Area %s, bank %d, size %d. Out of banks!\n",
+            p_area->name, p_area->bank_num_in, p_area->size);
+    exit(EXIT_FAILURE);
+}
+
+
+#define QSORT_A_FIRST -1
+#define QSORT_A_SAME   0
+#define QSORT_A_AFTER  1
+
+// qsort compare rule function for sorting areas
+static int area_item_compare(const void* a, const void* b) {
+
+    // sort by bank [asc] (fixed vs auto-bank), then by size [desc]
+    if (((area_item *)a)->bank_num_in != ((area_item *)b)->bank_num_in)
+        return  (((area_item *)a)->bank_num_in < ((area_item *)b)->bank_num_in) ? QSORT_A_FIRST : QSORT_A_AFTER;
+    else if (((area_item *)a)->size != ((area_item *)b)->size)
+        return (((area_item *)a)->size > ((area_item *)b)->size) ? QSORT_A_FIRST : QSORT_A_AFTER;
+    else
+        return QSORT_A_SAME;
+}
+
+static void areas_sort(void) {
+    // Sort banks by name
+    qsort (arealist.p_array, arealist.count, sizeof(area_item), area_item_compare);
+}
+
+
+// Assigns all areas -> banks, and bank numbers -> files
+// Fixed bank areas are placed first, then auto-banks fill the rest in
+// Only call after all areas have been collected from object files
+void obj_data_process(list_type * p_filelist) {
+    uint32_t c, s;
+    area_item   * areas   = (area_item *)arealist.p_array;
+    symbol_item * symbols = (symbol_item *)symbollist.p_array;
+    file_item   * files   = (file_item *)(p_filelist->p_array);
+
+    areas_sort();
+
+    // Assign areas to banks
+    for (c = 0; c < arealist.count; c++) {
+        banks_assign_area(&(areas[c]));
+
+        // If areas was auto-banked then set bank number in associated file
+        if ((areas[c].bank_num_in == BANK_NUM_AUTO) &&
+            (areas[c].bank_num_out != BANK_NUM_UNASSIGNED)) {
+
+            if (files[ areas[c].file_id ].bank_num != BANK_NUM_UNASSIGNED) {
+                printf("BankPack: ERROR! Can't assign bank number to a file more than once! Already %d, new is %d\n",
+                        files[ areas[c].file_id ].bank_num, areas[c].bank_num_out);
+                exit(EXIT_FAILURE);
+            }
+
+            files[ areas[c].file_id ].bank_num = areas[c].bank_num_out;
+            files[ areas[c].file_id ].rewrite_needed = true;
+        }
+    }
+
+    // Check all symbols for matches to banked entries, flag if match found
+    // TODO: ineffecient to loop over symbols for all files
+    for (c = 0; c < symbollist.count; c++) {
+        if (symbols[c].is_banked_def) {
+            for (s = 0; s < symbollist.count; s++) {
+                if (symbols[c].file_id == symbols[s].file_id) {
+                    // offset +1 bast the "b" char at start of banekd symbol entry name
+                    if (strcmp(symbols[c].name + 1, symbols[s].name) == 0) {
+                        symbols[c].found_matching_symbol = true;
+                        break;
+                    } else if (s == symbollist.count -1)
+                        printf("  -> NO MATCH FOUND%s\n", symbols[c].name);
+                }
+            }
+        }
+    }
+
+}
+
+
+// Display file/area/bank assignment
+// Should be called after obj_data_process()
+void banks_show(void) {
+
+    uint32_t c;
+    uint32_t a;
+
+    printf("\n=== Banks assigned: %d -> %d (allowed range %d -> %d). Max including fixed: %d) ===\n",
+            bank_assign_rom_min, bank_assign_rom_max,
+            bank_limit_rom_min,  bank_limit_rom_max,
+            bank_all_rom_max);
+
+    bank_item * banks = (bank_item *)banklist.p_array;
+    area_item * areas = (area_item *)arealist.p_array;
+    for (c = 0; c < banklist.count; c++) {
+        if (banks[c].free != BANK_SIZE_ROM) {
+            printf("Bank %d: size=%5d, free=%5d\n", c, banks[c].size, banks[c].free);
+            for (a = 0; a < arealist.count; a++) {
+                if (areas[a].bank_num_out == c) {
+                    printf(" +- Area: name=%8s, size=%5d, bank_in=%3d, bank_out=%3d, file=%s -> %s\n",
+                        areas[a].name,
+                        areas[a].size,
+                        areas[a].bank_num_in,
+                        areas[a].bank_num_out,
+                        file_get_name_in_by_id(areas[a].file_id),
+                        file_get_name_out_by_id(areas[a].file_id));
+                }
+            }
+        }
+    }
+
+    printf("\n");
+}
+
+
+// Accepts an input string line and writes it
+// out with an **updated bank num** to a file
+// * Adds trailing \n if missing
+bool area_modify_and_write_to_file(char * strline_in, FILE * out_file, uint16_t bank_num) {
+
+    // Only rewrite area bank number for unset banked CODE
+    if (strline_in[0] == 'A') {
+        // For lines: A _CODE_255 ...
+        if (strstr(strline_in, "A _CODE_255")) {
+            fprintf(out_file, "A _CODE_%d %s", bank_num, strstr(strline_in, "size"));
+            // Add trailing \n if missing (may be, due to using strtok() to split the string)
+            if (strline_in[(strlen(strline_in)-1)] != '\n')
+                fprintf(out_file, "\n");
+            return true;
+        }
+        else if (strstr(strline_in, "A _LIT_255")) {
+            fprintf(out_file, "A _LIT_%d %s", bank_num, strstr(strline_in, "size"));
+            // Add trailing \n if missing (may be, due to using strtok() to split the string)
+            if (strline_in[(strlen(strline_in)-1)] != '\n')
+                fprintf(out_file, "\n");
+            return true;
+        }
+    }
+    return false;
+}
+
+
+// Check to make sure a banked symbol has a matching symbol in the same file
+// This prevents mistakenly rewriting symbol b_<something> entries from asm files
+bool symbol_banked_check_rewrite_ok(char * symbol_name, uint32_t file_id) {
+
+    uint32_t c;
+    symbol_item * symbols = (symbol_item *)symbollist.p_array;
+
+    for (c = 0; c < symbollist.count; c++) {
+        if ((symbols[c].file_id == file_id) &&
+            (symbols[c].is_banked_def) &&
+            (symbols[c].found_matching_symbol)) {
+            // Make sure b_<name> matches
+            if (strcmp(symbols[c].name + 2, symbol_name) == 0)
+                return true;
+        }
+    }
+    return false;
+}
+
+
+// Accepts an input string line
+// and writes it out with an updated bank to a file
+// * Adds trailing \n if missing
+bool symbol_modify_and_write_to_file(char * strline_in, FILE * out_file, uint16_t bank_num, uint32_t file_id) {
+
+    uint32_t c;
+    uint32_t bank_in = 0;
+    char strmatch[OBJ_NAME_MAX_STR_LEN];
+    char symbol_name[OBJ_NAME_MAX_STR_LEN];
+    symbol_match_item * sym_match = (symbol_match_item *)symbol_matchlist.p_array;
+
+    // Only rewrite banked symbol entries
+    if (strline_in[0] == 'S') {
+        // For lines: S b_<symbol name>... Def0000FF
+        if (SYMBOL_REWRITE_RECORDS == sscanf(strline_in,"S b_%" TOSTR(OBJ_NAME_MAX_STR_LEN) "s Def%06x", symbol_name, &bank_in)) {
+            if (bank_in == BANK_NUM_AUTO) {
+                if (symbol_banked_check_rewrite_ok(symbol_name, file_id))  {
+                    fprintf(out_file, "S b_%s Def0000%02x", symbol_name, bank_num);
+                    if (strline_in[(strlen(strline_in)-1)] != '\n')
+                        fprintf(out_file, "\n");
+                    return true;
+                }
+            }
+        } // For lines: S ___bank_<trailing symbol name>... Def0000FF
+        else {
+            for (c = 0; c < symbol_matchlist.count; c++) {
+                // Prepare a sscanf match test string for the current symbol name
+                if (snprintf(strmatch, sizeof(strmatch), "S %s%%" TOSTR(OBJ_NAME_MAX_STR_LEN) "s Def%%06x", sym_match[c].name) > sizeof(strmatch))
+                    printf("BankPack: Warning: truncated symbol match string to:%s\n",strmatch);
+
+                if (SYMBOL_REWRITE_RECORDS == sscanf(strline_in, strmatch, symbol_name, &bank_in)) {
+                    if (bank_in == BANK_NUM_AUTO) {
+                        fprintf(out_file, "S %s%s Def0000%02x", sym_match[c].name, symbol_name, bank_num);
+                        if (strline_in[(strlen(strline_in)-1)] != '\n')
+                            fprintf(out_file, "\n");
+                        return true;
+                    }
+                }
+            }
+        }
+    }
+    return false;
+}
diff --git a/gbdk/gbdk-support/bankpack/obj_data.h b/gbdk/gbdk-support/bankpack/obj_data.h
new file mode 100644
index 00000000..0ec1828f
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/obj_data.h
@@ -0,0 +1,88 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _AREAS_H
+#define _AREAS_H
+
+#include "list.h"
+
+#define OBJ_NAME_MAX_STR_LEN 255
+#define AREA_LINE_RECORDS      2 // Bank number, Size
+#define SYMBOL_LINE_RECORDS    2 // Name, DefVal
+#define SYMBOL_REWRITE_RECORDS 2 // Name, DefVal
+
+#define PLATFORM_GB                 0
+#define PLATFORM_SMS                1
+#define PLATFORM_DEFAULT            PLATFORM_GB
+
+#define PLATFORM_STR_GB             "gb"
+#define PLATFORM_STR_AP             "ap"     // Uses PLATFORM_GB
+#define PLATFORM_STR_DUCK           "duck"   // Uses PLATFORM_GB
+#define PLATFORM_STR_SMS            "sms"
+#define PLATFORM_STR_GG             "gg"     // Uses PLATFORM_SMS
+#define PLATFORM_STR_MSXDOS         "msxdos" // Uses PLATFORM_SMS
+
+#define BANK_TYPE_UNSET             0
+#define BANK_TYPE_DEFAULT           1
+#define BANK_TYPE_LIT_EXCLUSIVE     2
+
+
+typedef struct bank_item {
+    uint32_t size;
+    uint32_t free;
+    uint32_t type;
+    uint16_t item_count;
+} bank_item;
+
+
+typedef struct area_item {
+    uint32_t file_id;
+    char     name[OBJ_NAME_MAX_STR_LEN];
+    uint32_t size;         // uint32_t to avoid mingw sscanf() buffer overflow
+    uint32_t bank_num_in;  // uint32_t to avoid mingw sscanf() buffer overflow
+    uint32_t bank_num_out; // uint32_t to avoid mingw sscanf() buffer overflow
+    uint32_t type;
+} area_item;
+
+typedef struct symbol_item {
+    uint32_t file_id;
+    char     name[OBJ_NAME_MAX_STR_LEN];
+    bool     is_banked_def;
+    uint32_t bank_num_in;   // uint32_t to avoid mingw sscanf() buffer overflow
+    bool     found_matching_symbol;
+} symbol_item;
+
+typedef struct symbol_match_item {
+    char     name[OBJ_NAME_MAX_STR_LEN];
+} symbol_match_item;
+
+void banks_set_platform(char * platform_str);
+int banks_get_platform(void);
+int banks_get_mbc_type(void);
+void banks_set_mbc(int);
+void banks_set_mbc_by_rom_byte_149(int);
+
+uint32_t banks_calc_cart_size(void);
+
+bool banks_set_min(uint16_t bank_num);
+bool banks_set_max(uint16_t bank_num);
+
+void banks_set_random(bool is_random);
+
+void obj_data_init(void);
+void obj_data_cleanup(void);
+
+int areas_add(char * area_str, uint32_t file_id);
+int symbols_add(char * area_str, uint32_t file_id);
+void symbol_match_add(char *);
+
+void obj_data_process(list_type *);
+
+bool area_modify_and_write_to_file(char * strline_in, FILE * out_file, uint16_t bank_num);
+bool symbol_modify_and_write_to_file(char * strline_in, FILE * out_file, uint16_t bank_num, uint32_t file_id);
+
+void banks_show(void);
+
+
+#endif // _AREAS_H
diff --git a/gbdk/gbdk-support/bankpack/path_ops.c b/gbdk/gbdk-support/bankpack/path_ops.c
new file mode 100644
index 00000000..58c064cd
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/path_ops.c
@@ -0,0 +1,103 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include "common.h"
+
+const char kExtensionSeparator = '.';
+const char kPathSeparator =
+
+#ifdef _WIN32
+  #ifndef _WIN32
+     #define __WIN32__
+  #endif
+#endif
+
+#ifdef __WIN32__
+                            '\\';
+#else
+                            '/';
+#endif
+
+
+static const char * get_filename_from_path(const char * path);
+static void filename_remove_extension(char * path);
+
+
+void filename_replace_extension(char * filename, char * new_ext, size_t maxlen) {
+
+    // Use a temp work string in case out and in filename are the same pointer
+    char temp[MAX_FILE_STR];
+    char ext_sep[2] = {'\0'}; // default to empty string
+
+    // Add leading . to path if needed
+    if (new_ext[0] != kExtensionSeparator) {
+        ext_sep[0] = kExtensionSeparator;
+        ext_sep[1] = '\0';
+    }
+
+    // Strip extension from filename, append new extension
+    filename_remove_extension(filename);
+    snprintf(temp, maxlen, "%s%s%s", filename, ext_sep, new_ext);
+    snprintf(filename, maxlen, "%s", temp);
+}
+
+
+void filename_replace_path(char * filename, char * new_path, size_t maxlen) {
+
+    // Use a temp work string in case out and in filename are the same pointer
+    char temp[MAX_FILE_STR];
+    char path_sep[2] = {'\0'}; // default to empty string
+
+    // Add trailing slash to path if needed
+    if ((new_path[(strlen(new_path)-1)] != kPathSeparator)) {
+        path_sep[0] = kPathSeparator;
+        path_sep[1] = '\0';
+    }
+
+    // Strip path from path+filename, pre-pend new path
+    snprintf(temp, maxlen, "%s%s%s", new_path, path_sep, get_filename_from_path(filename));
+    snprintf(filename, maxlen, "%s", temp);
+}
+
+
+static const char * get_filename_from_path(const char * path)
+{
+    size_t i;
+
+    // Returns string starting at last occurrance of path separator char
+    for(i = strlen(path) - 1; i; i--) {
+        if (path[i] == kPathSeparator) {
+            return &path[i+1];
+        }
+    }
+    return path;
+}
+
+
+static void filename_remove_extension(char * path)
+{
+    char * last_ext;
+    char * last_slash;
+
+    // Find the last path separator if present
+    // Starting from here ensures that no path ".." characters
+    // get mistaken as extension delimiters.
+    last_slash = strrchr (path, kExtensionSeparator);
+    if (!last_slash)
+        last_slash = path;
+
+    // Then check to see if there is an extension (starting with the last occurance of '.')
+    // (tries to remove *all* trailing extensions backward until the last slash)
+    last_ext = strrchr (last_slash, kExtensionSeparator);
+    while (last_ext) {
+        if (last_ext != NULL) {
+            // If an extension is found then overwrite it with a string terminator
+            *last_ext = '\0';
+        }
+        last_ext = strrchr (last_slash, kExtensionSeparator);
+    }
+}
+
diff --git a/gbdk/gbdk-support/bankpack/path_ops.h b/gbdk/gbdk-support/bankpack/path_ops.h
new file mode 100644
index 00000000..3d4c1ae5
--- /dev/null
+++ b/gbdk/gbdk-support/bankpack/path_ops.h
@@ -0,0 +1,11 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _PATH_OPS_H
+#define _PATH_OPS_H
+
+void filename_replace_extension(char * filename, char * new_ext, size_t maxlen);
+void filename_replace_path(char * filename, char * new_path, size_t maxlen);
+
+#endif // _PATH_OPS_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/gbcompress/LICENSE b/gbdk/gbdk-support/gbcompress/LICENSE
new file mode 100644
index 00000000..fdddb29a
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
diff --git a/gbdk/gbdk-support/gbcompress/Makefile b/gbdk/gbdk-support/gbcompress/Makefile
new file mode 100644
index 00000000..b87f0504
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/Makefile
@@ -0,0 +1,43 @@
+# gbcompress makefile
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+CC = $(TOOLSPREFIX)gcc
+CFLAGS = -ggdb -O -Wno-incompatible-pointer-types -DGBDKLIBDIR=\"$(TARGETDIR)\"
+OBJ = main.o gbcompress.o rlecompress.o files.o files_c_source.o
+BIN = gbcompress
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+
+clean:
+	rm -f *.o $(BIN) *~
+	rm -f tmp.*
+	rm -f *.exe
+
+# round trip the executable through compression and de-compression as a brief test
+test:
+	rm -f tmp.cmp; rm -f tmp.dcmp
+	cp $(BIN) tmp.in; ./gbcompress -v tmp.in tmp.cmp; ./gbcompress -v -d tmp.cmp tmp.dcmp; diff -s tmp.in tmp.dcmp
+	rm -f tmp.cmp.c; rm -f tmp.dcmp.c; 	rm -f tmp.cmp; rm -f tmp.dcmp
+	cp $(BIN) tmp.in; ./gbcompress -v --cout --varname=some_array tmp.in tmp.cmp.c; ./gbcompress -v -d --cin tmp.cmp.c tmp.dcmp; diff -s tmp.in tmp.dcmp
+	rm tmp.*
+	rm -f tmp.cmp; rm -f tmp.dcmp
+	cp $(BIN) tmp.in; ./gbcompress --alg=rle -v tmp.in tmp.cmp; ./gbcompress  --alg=rle -v -d tmp.cmp tmp.dcmp; diff -s tmp.in tmp.dcmp
+	rm -f tmp.cmp.c; rm -f tmp.dcmp.c; 	rm -f tmp.cmp; rm -f tmp.dcmp
+	cp $(BIN) tmp.in; ./gbcompress  --alg=rle -v --cout --varname=some_array tmp.in tmp.cmp.c; ./gbcompress --alg=rle -v -d --cin tmp.cmp.c tmp.dcmp; diff -s tmp.in tmp.dcmp
+	rm tmp.*
diff --git a/gbdk/gbdk-support/gbcompress/files.c b/gbdk/gbdk-support/gbcompress/files.c
new file mode 100644
index 00000000..c8bda1c8
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/files.c
@@ -0,0 +1,115 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+
+
+// Read from a file into a buffer (will allocate needed memory)
+// Returns NULL if reading file didn't succeed
+uint8_t * file_read_into_buffer(char * filename, uint32_t *ret_size) {
+
+    long fsize;
+    FILE * file_in = fopen(filename, "rb");
+    uint8_t * filedata = NULL;
+
+    if (file_in) {
+        // Get file size
+        fseek(file_in, 0, SEEK_END);
+        fsize = ftell(file_in);
+        if (fsize != -1L) {
+            fseek(file_in, 0, SEEK_SET);
+
+            filedata = malloc(fsize);
+            if (filedata) {
+                if (fsize != fread(filedata, 1, fsize, file_in)) {
+                    printf("gbcompress: Warning: File read size didn't match expected for %s\n", filename);
+                    filedata = NULL;
+                }
+                // Read was successful, set return size
+                *ret_size = fsize;
+            } else printf("gbcompress: ERROR: Failed to allocate memory to read file %s\n", filename);
+
+        } else printf("gbcompress: ERROR: Failed to read size of file %s\n", filename);
+
+        fclose(file_in);
+    } else printf("gbcompress: ERROR: Failed to open input file %s\n", filename);
+
+    return filedata;
+}
+
+
+
+// Writes a buffer to a file
+bool file_write_from_buffer(char * filename, uint8_t * p_buf, uint32_t data_len) {
+
+    bool status = false;
+    size_t wrote_bytes;
+    FILE * file_out = fopen(filename, "wb");
+
+    if (file_out) {
+        if (data_len == fwrite(p_buf, 1, data_len, file_out))
+            status = true;
+        else
+            printf("gbcompress: Warning: File write size didn't match expected for %s\n", filename);
+
+        fclose(file_out);
+    }
+    return status;
+}
+
+
+
+
+// Read from a file into a buffer (will allocate needed memory)
+// Returns NULL if reading file didn't succeed
+char * file_read_into_buffer_char(char * filename, uint32_t *ret_size) {
+
+    long fsize;
+    FILE * file_in = fopen(filename, "r");
+    char * filedata = NULL;
+
+    if (file_in) {
+        // Get file size
+        fseek(file_in, 0, SEEK_END);
+        fsize = ftell(file_in);
+        if (fsize != -1L) {
+            fseek(file_in, 0, SEEK_SET);
+
+            filedata = malloc(fsize);
+            if (filedata) {
+                if (fsize != fread(filedata, 1, fsize, file_in)) {
+                    printf("gbcompress: Warning: File read size didn't match expected for %s\n", filename);
+                    filedata = NULL;
+                }
+                // Read was successful, set return size
+                *ret_size = fsize;
+            } else printf("gbcompress: ERROR: Failed to allocate memory to read file %s\n", filename);
+
+        } else printf("gbcompress: ERROR: Failed to read size of file %s\n", filename);
+
+        fclose(file_in);
+    } else printf("gbcompress: ERROR: Failed to open input file %s\n", filename);
+
+    return filedata;
+}
+
+
+
+// Writes a buffer to a file
+bool file_write_from_buffer_char(char * filename, char * p_buf, uint32_t data_len) {
+
+    bool status = false;
+    size_t wrote_bytes;
+    FILE * file_out = fopen(filename, "w");
+
+    if (file_out) {
+        if (data_len == fwrite(p_buf, 1, data_len, file_out))
+            status = true;
+        else
+            printf("gbcompress: Warning: File write size didn't match expected for %s\n", filename);
+
+        fclose(file_out);
+    }
+    return status;
+}
diff --git a/gbdk/gbdk-support/gbcompress/files.h b/gbdk/gbdk-support/gbcompress/files.h
new file mode 100644
index 00000000..ca0fe3b0
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/files.h
@@ -0,0 +1,10 @@
+#ifndef _FILES_H
+#define _FILES_H
+
+uint8_t * file_read_into_buffer(char * filename, uint32_t *ret_size);
+bool file_write_from_buffer(char * filename, uint8_t * p_buf, uint32_t data_len);
+
+char * file_read_into_buffer_char(char * filename, uint32_t *ret_size);
+bool file_write_from_buffer_char(char * filename, char * p_buf, uint32_t data_len);
+
+#endif // _FILES_H
diff --git a/gbdk/gbdk-support/gbcompress/files_c_source.c b/gbdk/gbdk-support/gbcompress/files_c_source.c
new file mode 100644
index 00000000..deffe1ca
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/files_c_source.c
@@ -0,0 +1,228 @@
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "files.h"
+
+#define STR_FFWD_MATCH_ANY NULL
+
+#define BUF_DEFAULT_SIZE 20000
+#define BUF_GROW_SIZE    10000
+
+
+static uint32_t size_compressed = 0;
+static uint32_t size_decompressed = 0;
+
+
+void c_source_set_sizes(uint32_t size_compressed_in, uint32_t size_decompressed_in) {
+    size_compressed = size_compressed_in;
+    size_decompressed = size_decompressed_in;
+}
+
+
+// Search for a character in a string
+//
+// Terminate search if:
+// * any non-allowed character was found (str_chars_allowed, NULL for allow any chars)
+// * end of string is reached (by terminator or length)
+//
+static char * str_ffwd_to(char * str_in, uint32_t * max_len, char char_match, char * str_chars_allowed) {
+
+    char str_cur[2] = " \0"; // current character to test, for strpbrk
+
+    while ((*max_len) && (*str_in != '\0')) {
+
+        str_cur[0] = *str_in;
+        if (*str_in == char_match)
+            return str_in;
+        else if (str_chars_allowed) {
+            if (strpbrk(str_cur, str_chars_allowed) == NULL) {
+                // signal failure if any non-allowed character was found
+                return NULL;
+            }
+        } 
+
+        str_in++;
+        (*max_len)--;
+    }
+
+    return NULL;
+}
+
+
+
+// Convert an array of comma delimtied numbers into a buffer
+//
+// If conversion fails: returns NULL, *p_ret_size == 0
+//
+static uint8_t * str_array_to_buf(char * str_in, uint32_t * p_ret_len) {
+
+    uint32_t  buf_size  = BUF_DEFAULT_SIZE; 
+    uint8_t * p_buf     = malloc(buf_size);
+    uint8_t * p_buf_last;
+    char    * end_ptr;
+
+    // Read value at a time from a string buffer
+    // (strtok will replace the , chars with \0 on each split)
+    char * str_cur = strtok(str_in,",");
+
+    if (p_buf) {
+        
+        // Start with size zero
+        *p_ret_len = 0;
+
+        // Loop as long as strtok returns comma separated items
+        while (str_cur != NULL) {
+
+            // Grow buffer if needed
+            if ((*p_ret_len) >= buf_size)  {
+
+                buf_size += BUF_GROW_SIZE;
+                p_buf_last = p_buf;
+                p_buf = (uint8_t *)realloc(p_buf, buf_size);
+
+                // Exit if realloc failed
+                if (p_buf == NULL) {
+                    *p_ret_len = 0;
+                    free(p_buf_last);
+                    return NULL;
+                }
+            }
+
+            // Store current value
+            p_buf[ *p_ret_len ] = (uint8_t)strtol(str_cur, &end_ptr, 0);
+
+            // Only advance data buffer if conversion didn't fail
+            if (str_cur != end_ptr)
+                (*p_ret_len)++;
+
+            // Read next value (strtok maintains state of last call)
+            str_cur = strtok(NULL,",");
+        }
+    }
+
+    return p_buf;
+}
+
+
+
+// Read from a file into a buffer, find first C source formatted
+// array and parse it into another buffer (will allocate needed memory)
+//
+// Returns NULL if reading file didn't succeed
+//
+uint8_t * file_read_c_input_into_buffer(char * filename, uint32_t *ret_size) {
+
+    char * filedata = NULL;
+    uint32_t  file_size;
+
+    char * str_c_array = NULL;
+    char * str_c_array_start = NULL;
+    uint8_t * p_array_data = NULL;
+
+    filedata = file_read_into_buffer_char(filename, &file_size);
+
+    if (filedata) {
+        str_c_array = filedata; 
+
+        // Find array opening bracket `[`
+        str_c_array = str_ffwd_to(str_c_array, &file_size, '[', STR_FFWD_MATCH_ANY);
+        if (str_c_array) {
+            // Find Array closing bracket `]`
+            str_c_array = str_ffwd_to(str_c_array, &file_size, ']', "[xX0123456789ABCDEFabcdef\t\n\r ");
+            if (str_c_array) {
+                // Find Start or array
+                str_c_array = str_ffwd_to(str_c_array, &file_size, '{', "]\t\n\r =");
+                if (str_c_array) {
+                    // Save start of array
+                    str_c_array_start = str_c_array + 1;
+                    
+                    // Find end of array
+                    str_c_array = str_ffwd_to(str_c_array, &file_size, '}', "{xX0123456789ABCDEFabcdef,\t\n\r ");
+                    if (str_c_array) {
+                        // Terminate string at end of array
+                        *str_c_array = '\0';
+
+                        // If conversion fails: p_array_data == NULL, ret_size == 0
+                        p_array_data = str_array_to_buf(str_c_array_start, ret_size);
+
+                        // printf("C array length in = %d", *ret_size);
+                    }
+                }
+            }
+        }
+
+        // Free file data if allocated
+        free(filedata);
+        filedata = NULL;
+    }
+
+    return p_array_data;
+}
+
+
+
+// Writes a buffer to a file in C source format
+// Adds a matching .h if possible
+//
+bool file_write_c_output_from_buffer(char * filename, uint8_t * p_buf, uint32_t data_len, char * var_name, bool var_is_const) {
+
+    bool status = false;
+    size_t wrote_bytes;
+    FILE * file_out = fopen(filename, "w");
+    int i;
+
+    if (file_out) {
+
+        // Array entry with variable name
+        fprintf(file_out, "\n\n%s unsigned char %s[] = {", (var_is_const) ? "const" : "", var_name);
+
+        for (i = 0; i < data_len; i++) {
+
+            // Line break every 16 bytes (includes at start. but exclude if on last entry)
+            if ((i != data_len -1 ) && ((i % 16) == 0))
+                fprintf(file_out, "\n    ");
+
+            // Write current byte
+            fprintf(file_out, "0x%.2X", p_buf[i]);
+            
+            // Add comma after every entry except last one
+            if (i != data_len -1)
+                fprintf(file_out, ", ");
+        }
+        fprintf(file_out, "\n};\n\n");
+        status = true;
+
+        fclose(file_out);
+
+
+        // Create matching .h header file output, if file ends in .c or .C
+        if (strlen(filename) >= 2) {
+            if ((strcmp(&filename[strlen(filename) - 2],".c") == 0) ||
+                (strcmp(&filename[strlen(filename) - 2],".C") == 0)) {
+         
+                // Replace file extension
+                filename[strlen(filename) - 2] = '.';
+                filename[strlen(filename) - 1] = 'h';
+
+                FILE * file_out = fopen(filename, "w");
+
+                if (file_out) {
+
+                    fprintf(file_out, "\n\n#define %s_sz_comp %d\n", var_name, size_compressed);
+                    fprintf(file_out, "#define %s_sz_decomp %d\n", var_name, size_decompressed);
+
+                    // array entry with variable name
+                    fprintf(file_out, "\n\nextern %s unsigned char %s[];\n\n", (var_is_const) ? "const" : "", var_name);
+
+                    fclose(file_out);
+                }
+            }
+        }
+    }
+
+    return status;
+}
diff --git a/gbdk/gbdk-support/gbcompress/files_c_source.h b/gbdk/gbdk-support/gbcompress/files_c_source.h
new file mode 100644
index 00000000..1e3522a3
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/files_c_source.h
@@ -0,0 +1,9 @@
+#ifndef _FILES_C_SOURCE_H
+#define _FILES_C_SOURCE_H
+
+void c_source_set_sizes(uint32_t, uint32_t);
+
+bool file_write_c_output_from_buffer(char *, uint8_t *, uint32_t, char *, bool);
+uint8_t * file_read_c_input_into_buffer(char * filename, uint32_t *ret_size);
+
+#endif // _FILES_C_SOURCE_H
diff --git a/gbdk/gbdk-support/gbcompress/gbcompress.c b/gbdk/gbdk-support/gbcompress/gbcompress.c
new file mode 100644
index 00000000..6e493e5e
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/gbcompress.c
@@ -0,0 +1,382 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+//#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include "gbcompress.h"
+
+const uint8_t len_mask    = 0x3F;
+const uint8_t token_mask  = 0xC0;
+
+#define token_byte  0x00
+#define token_word  0x40
+#define token_str   0x80
+#define token_trash 0xC0
+
+const uint8_t EOFMarker  = 0x00;
+
+uint8_t * FinBuf      = NULL;
+uint32_t  Fsize_in    = 0;
+uint32_t  FinIndex    = 0;
+
+uint8_t ** pp_FoutBuf = NULL;
+uint8_t * FoutBuf     = NULL;
+uint32_t  Fsize_out   = 0;
+uint32_t  FoutIndex   = 0;
+
+
+static void check_write_size(uint8_t len) {
+
+    // Grow output buffer if needed
+    if ((FoutIndex + len) >= Fsize_out) {
+        uint8_t * p_tmp = *pp_FoutBuf;
+
+        // Reallocate to twice as large
+        Fsize_out = Fsize_out * 2;
+        *pp_FoutBuf = (void *)realloc(*pp_FoutBuf, Fsize_out);
+
+        // If realloc failed, free original buffer before quitting
+        if (!(*pp_FoutBuf)) {
+            printf("Error: Failed to grow memory for output buffer!\n");
+            if (p_tmp) free(p_tmp);
+            p_tmp = NULL;
+            exit(EXIT_FAILURE);
+        } else
+            FoutBuf = *pp_FoutBuf; // Update working pointer
+    }
+}
+
+
+static void write_byte(uint8_t len, uint8_t data) {
+
+    check_write_size(2); // writing 2 bytes
+
+    FoutBuf[FoutIndex++] = ((len - 1) & len_mask);
+    FoutBuf[FoutIndex++] = data;
+}
+
+
+static void write_word( uint8_t len, uint16_t data ) {
+
+    check_write_size(3); // writing 3 bytes
+
+    FoutBuf[FoutIndex++] = (((len - 1) & len_mask) | token_word);
+    FoutBuf[FoutIndex++] = (uint8_t)((data >> 8) & 0xFF);
+    FoutBuf[FoutIndex++] = (uint8_t)(data & 0xFF);
+}
+
+
+static void write_string( uint8_t len, uint16_t data) {
+
+    check_write_size(3); // writing 3 bytes
+
+    // conver's complement does not give the negation, see § Most negative number below. t back-ref offset from positive unsigned to negative signed
+    data = (data ^ 0xFFFF) + 1;
+
+    FoutBuf[FoutIndex++] = (((len - 1) & len_mask) | token_str);
+    FoutBuf[FoutIndex++] = (uint8_t)(data & 0xFF);
+    FoutBuf[FoutIndex++] = (uint8_t)((data >> 8) & 0xFF);
+}
+
+
+static void write_trash( uint8_t len, uint8_t * pos) {
+
+    uint8_t i;
+
+    check_write_size(len); // writing len bytes
+
+    FoutBuf[FoutIndex++] = (((len-1) & len_mask) | token_trash);
+    for (i=0; i < len; i++)
+        FoutBuf[FoutIndex++] = pos[i];
+}
+
+
+static void write_end(void) {
+
+    check_write_size(1); // writing 1 byte
+
+    FoutBuf[FoutIndex++] = EOFMarker;
+}
+
+
+static int read_uint16_t(uint32_t byte_pos, uint16_t * out_data) {
+
+    if ((byte_pos + 2) < Fsize_in) {
+        *out_data = (uint16_t)((FinBuf[byte_pos] << 8) + (uint16_t)FinBuf[byte_pos+1]);
+        return true;
+    }
+    else return false;
+}
+
+
+// Writes out any pending "trash" (non-rle sequence) and resets the counter
+static void flush_trash(uint32_t * byte_pos, uint32_t * trash_len) {
+
+    if (*trash_len > 0) {
+        write_trash(*trash_len, &FinBuf[*byte_pos - *trash_len]);
+        *trash_len = 0;
+    }
+}
+
+
+// Convert buffer inBuf to gbcompress rle encoding and write out to outBuf
+// Returns converted length
+uint32_t gbcompress_buf(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out) {
+
+    uint8_t   rle_u8_match;  // x
+    uint16_t  rle_u16_match; // y
+
+    uint32_t  rle_u8_len;   // r_rb
+    uint32_t  rle_u16_len;  // r_rw
+    uint32_t  rle_str_len;  // r_rs
+    uint32_t  trash_len;    // tb (by "trash" the original author meant, "non-rle sequence of bytes")
+
+    uint32_t  rle_str_start;       // rr
+    uint32_t  rle_str_back_offset; // sr (this is signed in original code, handled differently to be unsigned now)
+    uint32_t  rle_str_len_work;    // rl
+
+    FinBuf     = inBuf;
+    Fsize_in   = size_in;
+    FinIndex   = 0;         // bp
+
+    pp_FoutBuf = pp_outBuf;
+    FoutBuf    = *pp_outBuf;
+    Fsize_out  = size_out;
+    FoutIndex = 0;
+
+    trash_len = 0;
+
+    while (FinIndex < Fsize_in) {
+
+        // Check for u8 RLE run up to 63 bytes max
+        rle_u8_match = FinBuf[FinIndex];
+        rle_u8_len = 1;
+        while ((FinIndex + rle_u8_len) < Fsize_in) {
+            // If the current u8 matches, increment the length
+            if ((FinBuf[FinIndex + rle_u8_len] == rle_u8_match) &&
+                (rle_u8_len < 64)) {
+                rle_u8_len++;
+            }
+            else break;
+        }
+
+        // Check for overlapping uint16_t RLE run up to 63 bytes max
+        // Read in initial u16 to match against
+        if (read_uint16_t(FinIndex, &rle_u16_match)) {
+            uint16_t  temp_u16;
+            rle_u16_len = 1;
+            // If the current u16 matches, increment the length
+            while (read_uint16_t(FinIndex + (rle_u16_len * 2), &temp_u16)) {
+                if ((temp_u16 == rle_u16_match) &&
+                    (rle_u16_len < 64)) {
+                    rle_u16_len++;
+                }
+                else break;
+            }
+        }
+
+        // Check for matching sequences starting at current position
+        // against all previous data beginning at start up to 63 bytes max
+        // (back reference "strings")
+        rle_str_back_offset = 0;
+        rle_str_len = 0;
+        // Max string backreference length is 16 bits unsigned
+        // adjust search start accordingly
+        if (FinIndex > 0xFFFF)
+            rle_str_start = FinIndex - 0xFFFF;
+        else
+            rle_str_start = 0;
+
+        while (rle_str_start < FinIndex) {
+            rle_str_len_work = 0;
+
+            // Check for a matching run at rle_str_start against FinIndex
+            // and save length to rle_str_len_work
+            while ((FinIndex + rle_str_len_work) < Fsize_in) {
+                // Test to see if u8 in current sequence matches the u8 for a previous sequence
+                // Break out of the current sequence if it would reach 64 bytes
+                // or it would reach the current byte pos (and cause an overlap)
+                if ((FinBuf[rle_str_start + rle_str_len_work] == FinBuf[FinIndex + rle_str_len_work]) &&
+                    ((rle_str_start + rle_str_len_work) < FinIndex) &&
+                    (rle_str_len_work < 64)) {
+
+                    rle_str_len_work++;
+                }
+                else break;
+            }
+
+            // If the newly tested sequence length is greater than the previous length
+            // then save the length and store an negative offset to it in rle_str_back_offset
+            if (rle_str_len_work > rle_str_len) {
+                rle_str_back_offset = FinIndex - rle_str_start; // Changed this from neg offset to pos, and gets flipped to negative on writing it out
+                rle_str_len = rle_str_len_work;
+            }
+
+            rle_str_start++;
+        }
+
+
+        // Write out any rle data if it's ready
+        if ((rle_u8_len > 2) &&
+            (rle_u8_len > rle_u16_len) &&
+            (rle_u8_len > rle_str_len)) {
+            flush_trash(&FinIndex, &trash_len);
+            write_byte(rle_u8_len, rle_u8_match);
+            FinIndex = FinIndex + rle_u8_len;
+        }
+        else if ((rle_u16_len > 2) &&
+                 ((rle_u16_len*2) > rle_str_len)) {
+            flush_trash(&FinIndex, &trash_len);
+            write_word(rle_u16_len, rle_u16_match);
+            FinIndex = FinIndex + rle_u16_len*2;
+        }
+        else if (rle_str_len > 3) {
+            flush_trash(&FinIndex, &trash_len);
+            write_string(rle_str_len, rle_str_back_offset);
+            FinIndex = FinIndex + rle_str_len;
+        }
+        else if (trash_len >= 64) {
+            write_trash(trash_len, &FinBuf[FinIndex-trash_len]);
+            trash_len = 0;
+        }
+        else {
+            trash_len++;
+            FinIndex++;
+        }
+
+    }
+
+    // Flush any remaining "trash" bytes
+    flush_trash(&FinIndex, &trash_len);
+
+    write_end();
+
+    return FoutIndex;
+}
+
+
+
+static void write_single_byte(uint8_t data) {
+
+    check_write_size(1);
+
+    FoutBuf[FoutIndex++] = data;
+}
+
+
+static uint8_t read_single_byte(void) {
+
+    if (FinIndex >= Fsize_in) {
+        printf("Error: Read past end of input buffer!\n");
+        exit(EXIT_FAILURE);
+    }
+
+    return (FinBuf[FinIndex++]);
+}
+
+
+// Decompress buffer inBuf from gbcompress rle encoding and write to outBuf
+// Returns converted length
+uint32_t gbdecompress_buf(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out) {
+
+    uint8_t  rle_val[2];
+    uint8_t  token;
+    uint8_t  rle_toggle;
+    uint8_t * inBuf_end = inBuf + size_in - 1;
+    uint32_t rle_len;
+    uint32_t backref_index;
+
+    FinBuf     = inBuf;
+    Fsize_in   = size_in;
+    FinIndex   = 0;
+
+    pp_FoutBuf = pp_outBuf;
+    FoutBuf    = *pp_outBuf;
+    Fsize_out  = size_out;
+    FoutIndex  = 0;
+
+
+    while (FinIndex < size_in) {
+
+        token = read_single_byte();
+
+        // Check for EOF token, exit if encountered
+        if (token == EOFMarker)
+            break;
+
+        // Read a RLE token
+        // First byte should always be a token
+        rle_len = (token & len_mask) + 1;
+        token   =  token & token_mask;
+
+        // Read how to handle ENCODED RLE Value
+        switch (token) {
+            case token_byte:
+                // Load only one byte
+                rle_val[0] = read_single_byte();
+                break;
+
+            case token_word:
+                // If token is Word double the RLE decode length
+                rle_len *= 2;
+                rle_toggle = 0; // Reset RLE decoded word/byte flipflop
+
+                // Load LS byte then MS Byte
+                rle_val[0] = read_single_byte();
+                rle_val[1] = read_single_byte();
+                break;
+
+            case token_str:
+                // This token: copy N bytes from negative offset of current
+                // DECODED memory location (back reference)
+                backref_index = ((uint16_t)read_single_byte() | (( (uint16_t)read_single_byte() ) << 8));
+                // Convert input from from Signed to Unsigned
+                backref_index = (backref_index ^ 0xFFFF) + 1;
+
+                // Assign the string back reference relative to the current buffer pointer
+                backref_index = (FoutIndex - (uint32_t)backref_index);
+                break;
+
+            case token_trash: // AKA "Trash Bytes" in GBTD
+                // This token : copy next N bytes directly from ENCODED input
+                break;
+        }
+
+        while (rle_len) {
+
+            // Copy the decoded byte into VRAM
+            switch (token) {
+                case token_byte:
+                    // Copy from cached repeating RLE value
+                    write_single_byte(rle_val[0]);
+                    break;
+
+                case token_word:
+                    // Copy from cached repeating RLE value
+                    // Toggle between MS/LS bytes input values
+                    write_single_byte(rle_val[rle_toggle]);
+                    rle_toggle ^= 0x01;
+                    break;
+
+                case token_str:
+                    // Copy byte from the backreferenced VRAM address
+                    // Then increment backreference to next VRAM byte
+                    write_single_byte(FoutBuf[backref_index++]);
+                    break;
+
+                case token_trash:
+                    // Copy directly from encoded input
+                    write_single_byte(read_single_byte());
+                    break;
+            }
+
+            rle_len--; // Decrement number of RLE bytes remaining
+        }
+    }
+
+    return FoutIndex;
+}
diff --git a/gbdk/gbdk-support/gbcompress/gbcompress.h b/gbdk/gbdk-support/gbcompress/gbcompress.h
new file mode 100644
index 00000000..746b15db
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/gbcompress.h
@@ -0,0 +1,11 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _GBCOMPRESS_H
+#define _GBCOMPRESS_H
+
+uint32_t gbcompress_buf(uint8_t * inBuf, uint32_t InSize, uint8_t ** pp_outBuf, uint32_t size_out);
+uint32_t gbdecompress_buf(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out);
+
+#endif // _GBCOMPRESS_H
diff --git a/gbdk/gbdk-support/gbcompress/main.c b/gbdk/gbdk-support/gbcompress/main.c
new file mode 100644
index 00000000..13c82748
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/main.c
@@ -0,0 +1,242 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "gbcompress.h"
+#include "rlecompress.h"
+#include "files.h"
+#include "files_c_source.h"
+
+#define MAX_STR_LEN     4096
+
+#define COMPRESSION_TYPE_GB        0
+#define COMPRESSION_TYPE_RLE_BLOCK 1
+#define COMPRESSION_TYPE_DEFAULT   COMPRESSION_TYPE_GB
+
+char filename_in[MAX_STR_LEN] = {'\0'};
+char filename_out[MAX_STR_LEN] = {'\0'};
+
+uint8_t * p_buf_in  = NULL;
+uint8_t * p_buf_out = NULL;
+
+bool opt_mode_compress    = true;
+bool opt_verbose          = false;
+bool opt_compression_type = COMPRESSION_TYPE_DEFAULT;
+bool opt_c_source_input   = false;
+bool opt_c_source_output  = false;
+char opt_c_source_output_varname[MAX_STR_LEN] = "var_name";
+
+static void display_help(void);
+static int handle_args(int argc, char * argv[]);
+static int compress(void);
+static int decompress(void);
+void cleanup(void);
+
+
+static void display_help(void) {
+    fprintf(stdout,
+       "gbcompress [options] infile outfile\n"
+       "Use: compress a binary file and write it out.\n"
+       "\n"
+       "Options\n"
+       "-h    : Show this help screen\n"
+       "-d    : Decompress (default is compress)\n"
+       "-v    : Verbose output\n"
+       "--cin  : Read input as .c source format (8 bit char ONLY, uses first array found)\n"
+       "--cout : Write output in .c / .h source format (8 bit char ONLY) \n"
+       "--varname=<NAME> : specify variable name for c source output\n"
+       "--alg=<type>     : specify compression type: 'rle', 'gb' (default)\n"
+       "Example: \"gbcompress binaryfile.bin compressed.bin\"\n"
+       "Example: \"gbcompress -d compressedfile.bin decompressed.bin\"\n"
+       "Example: \"gbcompress --alg=rle binaryfile.bin compressed.bin\"\n"
+       "\n"
+       "The default compression (gb) is the type used by gbtd/gbmb\n"
+       "The rle compression is Amiga IFF style\n"
+       );
+}
+
+
+int handle_args(int argc, char * argv[]) {
+
+    int i = 1; // start at first arg
+
+    if( argc < 3 ) {
+        display_help();
+        return false;
+    }
+
+    // Start at first optional argument
+    // Last two arguments *must* be input/output files
+    for (i = 1; i < (argc - 2); i++ ) {
+
+        if (argv[i][0] == '-') {
+            if (strstr(argv[i], "-h") == argv[i]) {
+                display_help();
+                return false;  // Don't parse input when -h is used
+            } else if (strstr(argv[i], "-v") == argv[i]) {
+                opt_verbose = true;
+            } else if (strstr(argv[i], "--cin") == argv[i]) {
+                opt_c_source_input = true;
+            } else if (strstr(argv[i], "--cout") == argv[i]) {
+                opt_c_source_output = true;
+            } else if (strstr(argv[i], "--varname=") == argv[i]) {
+                snprintf(opt_c_source_output_varname, sizeof(opt_c_source_output_varname), "%s", argv[i] + 10);
+            } else if (strstr(argv[i], "--alg=gb") == argv[i]) {
+                opt_compression_type = COMPRESSION_TYPE_GB;
+            } else if (strstr(argv[i], "--alg=rle") == argv[i]) {
+                opt_compression_type = COMPRESSION_TYPE_RLE_BLOCK;
+            } else if (strstr(argv[i], "-d") == argv[i]) {
+                opt_mode_compress = false;
+            } else
+                printf("gbcompress: Warning: Ignoring unknown option %s\n", argv[i]);
+        }
+    }
+
+    // Copy input and output filenames from last two arguments
+    // if not preceded with option dash
+    if (argv[i][0] != '-') {
+        snprintf(filename_in, sizeof(filename_in), "%s", argv[i++]);
+
+        if (argv[i][0] != '-') {
+            snprintf(filename_out, sizeof(filename_out), "%s", argv[i++]);
+            return true;
+        }
+    }
+
+
+    return false;
+}
+
+
+void cleanup(void) {
+    if (p_buf_in != NULL) {
+        free(p_buf_in);
+        p_buf_in = NULL;
+    }
+    if (p_buf_out != NULL) {
+        free(p_buf_out);
+        p_buf_out = NULL;
+    }
+}
+
+
+static int compress() {
+
+    uint32_t  buf_size_in = 0;
+    uint32_t  buf_size_out = 0;
+    uint32_t  out_len = 0;
+    bool      result = false;
+
+    if (opt_c_source_input)
+        p_buf_in =  file_read_c_input_into_buffer(filename_in, &buf_size_in);
+    else
+        p_buf_in =  file_read_into_buffer(filename_in, &buf_size_in);
+
+    // Allocate buffer output buffer same size as input
+    // It can grow more in gbdecompress_buf()
+    buf_size_out = buf_size_in;
+    p_buf_out = malloc(buf_size_out);
+
+    if ((p_buf_in) && (p_buf_out) && (buf_size_in > 0)) {
+
+        if (opt_compression_type == COMPRESSION_TYPE_GB)
+            out_len = gbcompress_buf(p_buf_in, buf_size_in, &p_buf_out, buf_size_out);
+        else if (opt_compression_type == COMPRESSION_TYPE_RLE_BLOCK)
+            out_len = rlecompress_buf(p_buf_in, buf_size_in, &p_buf_out, buf_size_out);
+        else
+            return EXIT_FAILURE;
+
+        if (out_len > 0) {
+
+            if (opt_c_source_output) {
+                c_source_set_sizes(out_len, buf_size_in); // compressed, decompressed
+                result = file_write_c_output_from_buffer(filename_out, p_buf_out, out_len, opt_c_source_output_varname, true);
+            }
+            else
+                result = file_write_from_buffer(filename_out, p_buf_out, out_len);
+
+            if (result) {
+                if (opt_verbose)
+                    printf("Compressed: %d bytes -> %d bytes (%%%.2f)\n", buf_size_in, out_len, ((double)out_len / (double)buf_size_in) * 100);
+                return EXIT_SUCCESS;
+            }
+        }
+    }
+
+    return EXIT_FAILURE;
+}
+
+
+static int decompress() {
+
+    uint32_t  buf_size_in = 0;
+    uint32_t  buf_size_out = 0;
+    uint32_t  out_len = 0;
+    bool      result = false;
+
+    if (opt_c_source_input)
+        p_buf_in =  file_read_c_input_into_buffer(filename_in, &buf_size_in);
+    else
+        p_buf_in =  file_read_into_buffer(filename_in, &buf_size_in);
+
+    // Allocate buffer output buffer 3x size of input
+    // It can grow more in gbdecompress_buf()
+    buf_size_out = buf_size_in * 3;
+    p_buf_out = malloc(buf_size_out);
+
+    if ((p_buf_in) && (p_buf_out) && (buf_size_in > 0)) {
+
+        if (opt_compression_type == COMPRESSION_TYPE_GB)
+            out_len = gbdecompress_buf(p_buf_in, buf_size_in, &p_buf_out, buf_size_out);
+        else if (opt_compression_type == COMPRESSION_TYPE_RLE_BLOCK)
+            out_len = rledecompress_buf(p_buf_in, buf_size_in, &p_buf_out, buf_size_out);
+        else
+            return EXIT_FAILURE;
+
+        if (out_len > 0) {
+
+            if (opt_c_source_output) {
+                c_source_set_sizes(buf_size_in, out_len); // compressed, decompressed
+                result = file_write_c_output_from_buffer(filename_out, p_buf_out, out_len, opt_c_source_output_varname, true);
+            }
+            else {
+                result = file_write_from_buffer(filename_out, p_buf_out, out_len);
+            }
+
+            if (result) {
+                if (opt_verbose)
+                    printf("Decompressed: %d bytes -> %d bytes (compression was %%%.2f)\n", buf_size_in, out_len, ((double)buf_size_in / (double)out_len) * 100);
+                return EXIT_SUCCESS;
+            }
+        }
+    }
+
+    return EXIT_FAILURE;
+}
+
+
+int main( int argc, char *argv[] )  {
+
+    // Exit with failure by default
+    int ret = EXIT_FAILURE;
+
+    // Register cleanup with exit handler
+    atexit(cleanup);
+
+    if (handle_args(argc, argv)) {
+
+        if (opt_mode_compress)
+            ret = compress();
+        else
+            ret = decompress();
+    }
+    cleanup();
+
+    return ret; // Exit with failure by default
+}
diff --git a/gbdk/gbdk-support/gbcompress/rlecompress.c b/gbdk/gbdk-support/gbcompress/rlecompress.c
new file mode 100644
index 00000000..47f02637
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/rlecompress.c
@@ -0,0 +1,232 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+//#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include "rlecompress.h"
+
+
+static uint8_t * FinBuf      = NULL;
+static uint32_t  Fsize_in    = 0;
+static uint32_t  FinIndex    = 0;
+
+static uint8_t ** pp_FoutBuf = NULL;
+static uint8_t * FoutBuf     = NULL;
+static uint32_t  Fsize_out   = 0;
+static uint32_t  FoutIndex   = 0;
+
+
+#define RLE_MASK_LEN    0x7F
+#define RLE_MASK_TYPE   0x80
+#define RLE_TYPE_RAND   0x00
+#define RLE_TYPE_REPEAT 0x80
+#define RLE_MAX_LEN     127
+#define RLE_CTRL_END    0x00
+#define RLE_MAX_BLOCK   127
+#define RLE_CHANGE_COST 2
+
+
+static uint8_t rle_queued[128];
+static int rle_queue_idx = 0;
+static int run_len = 0;
+
+
+// Initialize the buffer vars
+static void initbufs(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out) {
+
+    FinBuf     = inBuf;
+    Fsize_in   = size_in;
+    FinIndex   = 0;
+
+    pp_FoutBuf = pp_outBuf;
+    FoutBuf    = *pp_outBuf;
+    Fsize_out  = size_out;
+    FoutIndex = 0;
+}
+
+
+static void check_write_size(int len) {
+
+    // Grow output buffer if needed
+    if ((FoutIndex + len) >= Fsize_out) {
+        uint8_t * p_tmp = *pp_FoutBuf;
+
+        // Reallocate to twice as large
+        Fsize_out = Fsize_out * 2;
+        *pp_FoutBuf = (void *)realloc(*pp_FoutBuf, Fsize_out);
+
+        // If realloc failed, free original buffer before quitting
+        if (!(*pp_FoutBuf)) {
+            printf("Error: Failed to grow memory for output buffer!\n");
+            if (p_tmp) free(p_tmp);
+            p_tmp = NULL;
+            exit(EXIT_FAILURE);
+        } else
+            FoutBuf = *pp_FoutBuf; // Update working pointer
+    }
+}
+
+
+
+static void write_end_of_data(void) {
+
+    check_write_size(1);                 // writing 1 control byte
+    FoutBuf[FoutIndex++] = RLE_CTRL_END; // Write sequence control byte
+}
+
+
+static void write_run_repeat(int len, uint8_t value) {
+
+    if (len) {
+        check_write_size(2); // writing 1 repeated value bytes + 1 control byte
+        // Write sequence control byte (length + type)
+        // Convert length to twos complement to identify it as repeat run
+        FoutBuf[FoutIndex++] = ((len & RLE_MASK_LEN) ^ 0xFFu) + 1u;
+        FoutBuf[FoutIndex++] = value;
+    }
+}
+
+
+static void rle_commit() {
+
+    int idx = 0;
+
+    if (rle_queue_idx > 0) {
+        check_write_size(rle_queue_idx + 1); // writing len bytes + 1 control byte
+        // Write sequence control byte (length + type)
+        FoutBuf[FoutIndex++] = (rle_queue_idx & RLE_MASK_LEN) | RLE_TYPE_RAND;
+        while (rle_queue_idx > 0) {
+            FoutBuf[FoutIndex++] = rle_queued[idx++];
+            rle_queue_idx--;
+        }
+    }
+    rle_queue_idx = 0; // redundant
+}
+
+
+
+// Convert buffer inBuf to rlecompress rle encoding and write out to outBuf
+// Returns converted length
+uint32_t rlecompress_buf(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out) {
+
+    uint8_t  last, current;
+    initbufs(inBuf, size_in, pp_outBuf, size_out);
+
+    last = 0;
+    run_len = 0;
+    rle_queue_idx = 0;
+
+    while (FinIndex < Fsize_in) {
+
+        current = FinBuf[FinIndex++];
+
+        if (current != last) {
+            // The run stopped, if switching to repeat is worthwhile then
+            // flush preceding random data
+            if (run_len > RLE_CHANGE_COST) {
+                rle_commit();
+                write_run_repeat(run_len, last);
+            } else {
+                // Otherwise treat repeat data as random and queue it
+                // with flushing as needed
+                while(run_len--) {
+                    if (rle_queue_idx >= RLE_MAX_BLOCK) {
+                        rle_commit();
+                    }
+                    rle_queued[rle_queue_idx++] = last;
+                }
+            }
+          run_len = 1;
+          last = current;
+        }
+        else {
+            // Flush pending repeat if max length is encountered
+            if (run_len >= RLE_MAX_BLOCK) {
+                rle_commit();
+                write_run_repeat(run_len, last);
+                run_len = 0;
+            }
+            run_len++;
+        }
+
+    }
+
+    // If switching to repeat is worthwhile then flush preceding random data
+    if (run_len > RLE_CHANGE_COST) {
+        rle_commit();
+        write_run_repeat(run_len, last);
+    } else {
+        // Otherwise treat repeat data as random and queue it
+        // with flushing as needed
+        while(run_len--) {
+            if (rle_queue_idx >= RLE_MAX_BLOCK) {
+                rle_commit();
+            }
+            rle_queued[rle_queue_idx++] = last;
+        }
+    }
+
+    // Flush any trailing data
+    rle_commit();
+    write_end_of_data();
+
+    return FoutIndex;
+
+}
+
+
+
+static void write_single_byte(uint8_t data) {
+
+    check_write_size(1);
+
+    FoutBuf[FoutIndex++] = data;
+}
+
+
+static uint8_t read_single_byte(void) {
+
+    if (FinIndex >= Fsize_in) {
+        printf("Error: Read past end of input buffer!\n");
+        exit(EXIT_FAILURE);
+    }
+
+    return (FinBuf[FinIndex++]);
+}
+
+
+
+// Decompress buffer inBuf from gbcompress rle encoding and write to outBuf
+// Returns converted length
+uint32_t rledecompress_buf(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out) {
+
+    initbufs(inBuf, size_in, pp_outBuf, size_out);
+
+    uint8_t token, rle_len, value;
+
+    while (FinIndex < size_in) {
+
+        token = read_single_byte();
+
+        // Check for EOF token, exit if encountered
+        if (token == RLE_CTRL_END)
+            break;
+        else if ((token & RLE_MASK_TYPE) == RLE_TYPE_RAND) {
+            rle_len = token & RLE_MASK_LEN;
+            while (rle_len--)
+                write_single_byte(read_single_byte());
+        }
+        else { // if ((token & RLE_MASK_TYPE) == RLE_TYPE_REPEAT) {
+            rle_len = ((token ^ 0xFF) + 1) & RLE_MASK_LEN; // length is two's complement
+            value = read_single_byte();
+            while (rle_len--)
+                write_single_byte(value);
+        }
+    }
+
+    return FoutIndex;
+}
diff --git a/gbdk/gbdk-support/gbcompress/rlecompress.h b/gbdk/gbdk-support/gbcompress/rlecompress.h
new file mode 100644
index 00000000..c39ae43d
--- /dev/null
+++ b/gbdk/gbdk-support/gbcompress/rlecompress.h
@@ -0,0 +1,12 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _RLECOMPRESS_H
+#define _RLECOMPRESS_H
+
+uint32_t rlecompress_buf(uint8_t * inBuf, uint32_t InSize, uint8_t ** pp_outBuf, uint32_t size_out);
+uint32_t rledecompress_buf(uint8_t * inBuf, uint32_t size_in, uint8_t ** pp_outBuf, uint32_t size_out);
+uint32_t rlecompress_buf_escaped(uint8_t * inBuf, uint32_t InSize, uint8_t ** pp_outBuf, uint32_t size_out);
+
+#endif // _RLECOMPRESS_H
diff --git a/gbdk/gbdk-support/ihxcheck/LICENSE b/gbdk/gbdk-support/ihxcheck/LICENSE
new file mode 100644
index 00000000..fdddb29a
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
diff --git a/gbdk/gbdk-support/ihxcheck/Makefile b/gbdk/gbdk-support/ihxcheck/Makefile
new file mode 100644
index 00000000..472eda8b
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/Makefile
@@ -0,0 +1,31 @@
+# ihxcheck makefile
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+CC = $(TOOLSPREFIX)gcc
+CFLAGS = -ggdb -O -Wno-incompatible-pointer-types -DGBDKLIBDIR=\"$(TARGETDIR)\"
+OBJ = ihxcheck.o areas.o ihx_file.o
+BIN = ihxcheck
+
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+
+clean:
+	rm -f *.o $(BIN) *~
+	rm -f *.exe
+
diff --git a/gbdk/gbdk-support/ihxcheck/areas.c b/gbdk/gbdk-support/ihxcheck/areas.c
new file mode 100644
index 00000000..9289b58c
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/areas.c
@@ -0,0 +1,97 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+// #include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "areas.h"
+
+#define AREA_GROW_SIZE 500
+
+area_item * arealist;
+uint32_t    arealist_size;
+uint32_t    arealist_count;
+
+
+uint32_t min(uint32_t a, uint32_t b) {
+    return (a < b) ? a : b;
+}
+
+uint32_t max(uint32_t a, uint32_t b) {
+    return (a > b) ? a : b;
+}
+
+
+// Returns size of overlap between two address ranges,
+// if zero then no overlap
+static uint32_t addrs_check_overlap(uint32_t a_start, uint32_t a_end, uint32_t b_start, uint32_t b_end) {
+
+    uint32_t size_used;
+
+    // Check whether the address range *doesn't* overlap
+    if ((b_start > a_end) || (b_end < a_start)) {
+        size_used =  0; // no overlap, size = 0
+    } else {
+        size_used = min(b_end, a_end) - max(b_start, a_start) + 1; // Calculate minimum overlap
+
+        printf("WARNING: Multiple write of %5d bytes at 0x%x -> 0x%x (%x -> %x, %x -> %x)\n",
+                size_used, max(b_start, a_start), min(b_end, a_end),
+                a_start, a_end, b_start, b_end);
+    }
+    return size_used;
+}
+
+
+void arealist_additem(area_item * p_area) {
+
+    arealist_count++;
+    // Grow array if needed
+    if (arealist_count == arealist_size) {
+        arealist_size += AREA_GROW_SIZE;
+        arealist = (area_item *)realloc(arealist, arealist_size * sizeof(area_item));
+    }
+
+    arealist[arealist_count-1] = *p_area;
+}
+
+
+void areas_init(void) {
+    arealist_count  = 0;
+    arealist_size   = AREA_GROW_SIZE;
+    arealist        = (area_item *)malloc(arealist_size * sizeof(area_item));
+}
+
+
+void areas_cleanup(void) {
+    if (arealist)
+        free (arealist);
+}
+
+
+int areas_add(area_item * p_area) {
+
+    uint32_t c;
+    uint32_t size_used;
+    int ret = true; // default to success
+
+    // Check for overlap with existing areas
+    for (c = 0; c < arealist_count; c++) {
+
+        size_used = addrs_check_overlap(arealist[c].start, arealist[c].end,
+                                        p_area->start, p_area->end);
+        // Signal failure on any overlap
+        // (Keep looping to display all warnings though)
+        if (size_used > 0)
+            ret = false;
+    }
+
+    // Now add the area
+    arealist_additem(p_area);
+
+    return ret;
+}
\ No newline at end of file
diff --git a/gbdk/gbdk-support/ihxcheck/areas.h b/gbdk/gbdk-support/ihxcheck/areas.h
new file mode 100644
index 00000000..1596a7de
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/areas.h
@@ -0,0 +1,19 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _AREAS_H
+#define _AREAS_H
+
+typedef struct area_item {
+    uint32_t start;
+    uint32_t end;
+    uint32_t length;
+} area_item;
+
+
+void areas_init(void);
+void areas_cleanup(void);
+int areas_add(area_item * p_area);
+
+#endif // _AREAS_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/ihxcheck/ihx_file.c b/gbdk/gbdk-support/ihxcheck/ihx_file.c
new file mode 100644
index 00000000..e2b8a6e3
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/ihx_file.c
@@ -0,0 +1,271 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "areas.h"
+#include "ihx_file.h"
+
+// Example data to parse from a .ihx file
+// No area names
+// : 01 0020 00 E9 F6
+// S BB AAAA RR DD CC
+//
+// S:    Start (":") (1 char)
+// BB:   ByteCount   (2 chars, one byte)
+// AAAA: Address     (4 chars, two bytes)
+// RR:   Record Type (2 chars, one byte. 00=data, 01=EOF, Others)
+// DD:   Data        (<ByteCount>  bytes)
+// CC:   Checksum    (2 chars, one byte. Sum record bytes, 2's complement of LSByte)
+/*
+:01002000E9F6
+:05002800220D20FCC9BF
+:070030001A22130D20FAC98A
+.
+.
+.
+:00000001FF (EOF indicator)
+*/
+
+/* TODO/WARNING/BUG: 100% full banks
+It may not be possible to easily tell the difference between a perfectly filled
+bank (100% and no more) and an adjacent partially filled bank that starts at
+zero - versus - the first bank overflowed into the second that is empty.
+
+Currently the 100% bank will get merged into the next one and present as overflow
+*/
+
+
+#define BANK_NUM(addr)  ((addr & 0xFFFFC000U) >> 14)
+#define ADDR_UNSET      0xFFFFFFFEU
+
+#define MAX_STR_LEN     4096
+#define IHX_DATA_LEN_MAX 255
+#define IHX_REC_LEN_MIN  (1 + 2 + 4 + 2 + 0 + 2) // Start(1), ByteCount(2), Addr(4), Rec(2), Data(0..255x2), Checksum(2)
+
+// IHX record types
+#define IHX_REC_DATA     0x00U
+#define IHX_REC_EOF      0x01U
+#define IHX_REC_EXTSEG   0x02U
+#define IHX_REC_STARTSEG 0x03U
+#define IHX_REC_EXTLIN   0x04U
+#define IHX_REC_STARTLIN 0x05U
+
+typedef struct ihx_record {
+    uint16_t length;
+    uint32_t byte_count;
+    uint32_t address;
+    uint32_t address_end;
+    uint32_t type;
+    uint32_t checksum; // Would prefer this be a uint8_t, but mingw sscanf("%2hhx") has a buffer overflow that corrupts adjacent data
+} ihx_record;
+
+uint32_t g_address_upper;
+bool     g_option_warnings_as_errors = false;
+
+void set_option_warnings_as_errors(bool new_val) {
+    g_option_warnings_as_errors = new_val;
+}
+
+
+// Return false if any character isn't a valid hex digit
+int check_hex(char * c) {
+    while (*c != '\0') {
+        if ((*c >= '0') && (*c <= '9'))
+            c++;
+        if ((*c >= 'A') && (*c <= 'F'))
+            c++;
+        if ((*c >= 'a') && (*c <= 'f'))
+            c++;
+        else
+            return false;
+    }
+
+    return true;
+}
+
+
+// Parse and validate an IHX record
+int ihx_parse_and_validate_record(char * p_str, ihx_record * p_rec) {
+
+        int calc_length = 0;
+        int c;
+        uint32_t ctemp, checksum_calc = 0; // Avoid mingw sscanf("%2hhx") buffer overflow with uint8_t
+
+        // Remove trailing CR and LF
+        p_rec->length = strlen(p_str);
+        for (c = 0;c < p_rec->length;c++) {
+            if (p_str[c] == '\n' || p_str[c] == '\r') {
+                p_str[c] = '\0';   // Replace char with string terminator
+                p_rec->length = c; // Shrink length to truncated size
+                break;             // Exit loop after finding first CR or LF
+            }
+        }
+
+        // Only parse lines that start with ':' character (Start token for IHX record)
+        if (p_str[0] != ':') {
+            printf("Warning: IHX: Invalid start of line token for line: %s \n", p_str);
+            return false;
+        }
+
+       // Require minimum length
+        if (p_rec->length < IHX_REC_LEN_MIN) {
+            printf("Warning: IHX: Invalid line, too few characters: %s. Is %d, needs at least %d \n", p_str, p_rec->length, IHX_REC_LEN_MIN);
+            return false;
+        }
+
+        // Only hex characters are allowed after start token
+        p_str++; // Advance past Start code
+        if (check_hex(p_str)) {
+            printf("Warning: IHX: Invalid line, non-hex characters present: %s\n", p_str);
+            return false;
+        }
+
+        // Read record header: byte count, start address, type
+        sscanf(p_str, "%2x%4x%2x", &p_rec->byte_count, &p_rec->address, &p_rec->type);
+        p_str += (2 + 4 + 2);
+
+
+        // Require expected data byte count to fit within record length (at 2 chars per hex byte)
+        calc_length = IHX_REC_LEN_MIN + (p_rec->byte_count * 2);
+        if (p_rec->length != calc_length) {
+            printf("Warning: IHX: byte count doesn't match length available in record! Record length = %d, Calc length = %d, bytecount = %d \n", p_rec->length, calc_length, p_rec->byte_count);
+            return false;
+        }
+
+        // Is this an extended linear address record? Read in offset address if so
+        if (p_rec->type == IHX_REC_EXTLIN) {
+            sscanf(p_str, "%4x", &g_address_upper);
+            g_address_upper <<= 16; // Shift into upper 16 bits of address space
+        }
+        else if (p_rec->type == IHX_REC_DATA) {
+
+            // Don't process records with zero bytes of length
+            if (p_rec->byte_count == 0) {
+                printf("Warning: IHX: Zero length record starting at %x\n", p_rec->address);
+                return false;
+            }
+
+            // Apply extended linear address (upper 16 bits of address space)
+            // Calculate end address
+            p_rec->address |= g_address_upper;
+            p_rec->address_end = p_rec->address + p_rec->byte_count - 1;
+        }
+
+
+        // Read data segment and calculate checsum of data + headers
+        checksum_calc = p_rec->byte_count + (p_rec->address & 0xFF) + ((p_rec->address >> 8) & 0xFF) + p_rec->type;
+        for (c = 0;c < p_rec->byte_count;c++) {
+            sscanf(p_str, "%2x", &ctemp);
+            p_str += 2;
+            checksum_calc += ctemp;
+        }
+
+        // Final calculated checeksum is 2's complement of LSByte
+        checksum_calc = (((checksum_calc & 0xFF) ^ 0xFF) + 1) & 0xFF;
+
+        // Read checksum from data
+        sscanf(p_str, "%2x", &p_rec->checksum);
+        p_str += 2;
+
+        if (p_rec->checksum != checksum_calc) {
+            printf("Warning: IHX: record checksum %x didn't match calculated checksum %x\n", p_rec->checksum, checksum_calc);
+            return false;
+        }
+
+        // For records that start in banks above the unbanked region (0x000 - 0x3FFF)
+        // Warn (but don't error) if they cross the boundary between different banks
+        if ((p_rec->address >= 0x00004000U) &&
+            ((p_rec->address & 0xFFFFC000U) != (p_rec->address_end & 0xFFFFC000U))) {
+            printf("Warning: Write from one bank spans into the next. %x -> %x (bank %d -> %d)\n",
+                   p_rec->address, p_rec->address_end, BANK_NUM(p_rec->address), BANK_NUM(p_rec->address_end));
+        }
+
+        return true;
+}
+
+
+int ihx_file_process_areas(char * filename_in) {
+
+    int  ret = EXIT_SUCCESS; // default to success
+    char cols;
+    char strline_in[MAX_STR_LEN] = "";
+    FILE * ihx_file = fopen(filename_in, "r");
+    area_item area;
+    ihx_record ihx_rec;
+
+    areas_init();
+
+    // Initialize global upper address modifier
+    g_address_upper = 0x0000;
+
+    // Initialize area record
+    area.start = ADDR_UNSET;
+    area.end   = ADDR_UNSET;
+
+
+    if (ihx_file) {
+
+        // Read one line at a time into \0 terminated string
+        while (fgets(strline_in, sizeof(strline_in), ihx_file) != NULL) {
+
+            // Parse record, skip if fails validation
+            if (!ihx_parse_and_validate_record(strline_in, &ihx_rec))
+                continue;
+
+            // Process the pending record and exit if last record (EOF)
+            // Also ignore non-default data records (don't seem to occur for gbz80)
+            if (ihx_rec.type == IHX_REC_EOF) {
+                if (!areas_add(&area) && g_option_warnings_as_errors)
+                    ret = EXIT_FAILURE;
+                continue;
+            } else if (ihx_rec.type == IHX_REC_EXTLIN) {
+                // printf("Extended linear address changed to %08x %s\n\n\n", g_address_upper, strline_in);
+                continue;
+            } else if (ihx_rec.type != IHX_REC_DATA) {
+                printf("Warning: IHX: dropped record %s of type %d\n", strline_in, ihx_rec.type);
+                continue;
+            }
+
+            // Records are left pending (non-processed) until they don't merge
+            // with the current incoming record *or* the final (EOF) record is found.
+
+            // Try to merge with (pending) previous record if it's address-adjacent,
+            // except when the new record starts or ends on a bank boundary
+            // (this reduces count from 1000's since most are only 32 bytes long)
+            if ((ihx_rec.address == area.end + 1) && ((ihx_rec.address & 0x00003FFFU) != 0x00000000U)) {
+                area.end = ihx_rec.address_end;  // append to previous area
+            } else if ((ihx_rec.address_end == area.start + 1) && !((ihx_rec.address_end & 0x00003FFFU) != 0x00003FFFU)) {
+                area.start = ihx_rec.address;    // pre-pend to previous area
+            } else {
+                // New record was *not* adjacent to last,
+                // so process the last/pending record
+                if (area.start != ADDR_UNSET) {
+                    if (!areas_add(&area) && g_option_warnings_as_errors)
+                        ret = EXIT_FAILURE;
+                }
+                // Now queue current record as pending for next loop
+                area.start = ihx_rec.address;
+                area.end   = ihx_rec.address + ihx_rec.byte_count - 1;
+            }
+
+        } // end: while still lines to process
+
+        fclose(ihx_file);
+
+    } // end: if valid file
+    else {
+        printf("Problem with filename or unable to open file! %s\n", filename_in);
+        ret = EXIT_FAILURE;
+    }
+
+    areas_cleanup();
+    return ret;
+}
+
diff --git a/gbdk/gbdk-support/ihxcheck/ihx_file.h b/gbdk/gbdk-support/ihxcheck/ihx_file.h
new file mode 100644
index 00000000..04e3cbd2
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/ihx_file.h
@@ -0,0 +1,12 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+
+#ifndef _IHX_FILE_H
+#define _IHX_FILE_H
+
+int ihx_file_process_areas(char * filename_in);
+void set_option_warnings_as_errors(bool new_val);
+
+#endif // _IHX_FILE_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/ihxcheck/ihxcheck.c b/gbdk/gbdk-support/ihxcheck/ihxcheck.c
new file mode 100644
index 00000000..603b9bf1
--- /dev/null
+++ b/gbdk/gbdk-support/ihxcheck/ihxcheck.c
@@ -0,0 +1,88 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "ihx_file.h"
+#include "areas.h"
+
+#define MAX_STR_LEN     4096
+
+void display_help(void);
+int handle_args(int argc, char * argv[]);
+
+char filename_in[MAX_STR_LEN] = {'\0'};
+
+
+void display_help(void) {
+    fprintf(stdout,
+           "ihx_check input_file.ihx [options]\n"
+           "\n"
+           "Options\n"
+           "-h : Show this help\n"
+           "-e : Treat warnings as errors\n"
+           "\n"
+           "Use: Read a .ihx and warn about overlapped areas.\n"
+           "Example: \"ihx_check build/MyProject.ihx\"\n"
+           );
+}
+
+
+int handle_args(int argc, char * argv[]) {
+
+    int i;
+
+    if( argc < 2 ) {
+        display_help();
+        return false;
+    }
+
+    // Copy input filename (if not preceded with option dash)
+    if (argv[1][0] != '-')
+        snprintf(filename_in, sizeof(filename_in), "%s", argv[1]);
+
+    // Start at first optional argument, argc is zero based
+    for (i = 1; i <= (argc -1); i++ ) {
+
+        if (strstr(argv[i], "-h") == argv[i]) {
+            display_help();
+            return false;  // Don't parse input when -h is used
+
+        } else if (strstr(argv[i], "-e") == argv[i]) {
+            set_option_warnings_as_errors(true);
+        }
+
+    }
+
+    return true;
+}
+
+
+int matches_extension(char * filename, char * extension) {
+    return (strcmp(filename + (strlen(filename) - strlen(extension)), extension) == 0);
+}
+
+
+int main( int argc, char *argv[] )  {
+
+    int ret = EXIT_FAILURE; // Exit with failure by default
+
+    if (handle_args(argc, argv)) {
+
+        // Must at least have extension
+        if (strlen(filename_in) >=5) {
+            // detect file extension
+            if (matches_extension(filename_in, (char *)".ihx")) {
+                ret = ihx_file_process_areas(filename_in);
+            }
+        }
+    }
+
+    return ret; // Exit with failure by default
+}
\ No newline at end of file
diff --git a/gbdk/gbdk-support/lcc/Makefile b/gbdk/gbdk-support/lcc/Makefile
new file mode 100644
index 00000000..1320b482
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/Makefile
@@ -0,0 +1,39 @@
+# Simple Makefile for the lcc frontend.
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+# MacOS date doesn't support '--utc', use '-u'
+BUILDDATE=$(shell date -u +%Y/%m/%d)
+BUILDTIME=$(shell date -u +%H:%M:%S)
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+
+CC = $(TOOLSPREFIX)gcc
+CFLAGS = -ggdb -O -Wno-incompatible-pointer-types -DGBDKLIBDIR=\"$(TARGETDIR)\"
+CFLAGS += -DBUILDDATE=\"$(BUILDDATE)\" -DBUILDTIME=\"$(BUILDTIME)\"
+ifdef BINDIR
+CFLAGS += -DGBDKBINDIR=\"$(BINDIR)\"
+endif
+OBJ = lcc.o gb.o targets.o list.o
+BIN = lcc
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+
+clean:
+	rm -f *.o $(BIN) *~
+	rm -f *.exe
+
diff --git a/gbdk/gbdk-support/lcc/gb.c b/gbdk/gbdk-support/lcc/gb.c
new file mode 100644
index 00000000..276ccad7
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/gb.c
@@ -0,0 +1,353 @@
+/* Unix */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <ctype.h>
+
+#ifdef __WIN32__
+#include <windows.h>
+#endif
+
+#include "gb.h"
+#include "targets.h"
+
+#ifndef GBDKLIBDIR
+#define GBDKLIBDIR "\\gbdk\\"
+#endif
+
+extern char *progname;
+extern char * strsave(const char *);
+
+// Set default class as the first entry in classes (Game Boy)
+static CLASS *_class = &classes[0];
+
+static struct {
+	const char *name;
+	const char *val;
+} _tokens[] = {
+		// expandable string tokens used in "CLASS" command strings
+		{ "port",		"sm83" },  // if default class is ever changed from Game Boy, this default (and plat) may need to be changed to match
+		{ "plat",		"gb" },
+		{ "sdccdir", "%bindir%"},
+		{ "cpp",		"%sdccdir%sdcpp" },
+		{ "cppdefault", 	"-Wall -DSDCC_PORT=%port% -DSDCC_PLAT=%plat% -D%cppmodel%"
+		},
+		{ "cppmodel",	"SDCC_MODEL_SMALL" },
+		{ "includedefault",	"-I%includedir%" },
+		{ "includedir", 	"%prefix%include" },
+		{ "prefix",		GBDKLIBDIR },
+		{ "comopt",		"--noinvariant --noinduction" },
+		{ "commodel", 	"small" },
+		{ "com",		"%sdccdir%sdcc" },
+		{ "comflag",	"-c"},
+		{ "comdefault",	"-m%port% --no-std-crt0 --fsigned-char --use-stdout -D__PORT_%port% -D__TARGET_%plat% "},
+		/* asdsgb assembler defaults:
+			-p: disable pagination
+			-o: create object file
+			-g: make undef symbols global
+			-n: defer symbol resolving to link time (autobanking relies on this) [requires sdcc 12238+]
+		*/
+		{ "asdefault",	"-pogn -I%libdir%%plat%" },
+		{ "as_gb",		"%sdccdir%sdasgb" },
+		{ "as_z80",		"%sdccdir%sdasz80" },
+		{ "bankpack", "%bindir%bankpack" },
+		{ "ld_gb",		"%sdccdir%sdldgb" },
+		{ "ld_z80",		"%sdccdir%sdldz80" },
+		{ "libdir",		"%prefix%lib/%libmodel%/asxxxx/" },
+		{ "libmodel",	"small" },
+#ifndef GBDKBINDIR
+		{ "bindir",		"%prefix%bin/" },
+#else
+		{ "bindir",		GBDKBINDIR },
+#endif
+		{ "ihxcheck", "%bindir%ihxcheck" },
+		{ "mkbin", "%sdccdir%makebin" },
+		{ "crt0dir", "%libdir%%plat%/crt0.o"},
+		{ "libs_include", "-k %libdir%%port%/ -l %port%.lib -k %libdir%%plat%/ -l %plat%.lib"},
+                { "mkcom", "%sdccdir%makecom"}
+};
+
+static char *getTokenVal(const char *key)
+{
+	int i;
+	for (i = 0; i < ARRAY_LEN(_tokens); i++) {
+		if (!strcmp(_tokens[i].name, key))
+			return strdup(_tokens[i].val);
+	}
+	assert(0);
+	return NULL;
+}
+
+static void setTokenVal(const char *key, const char *val)
+{
+	int i;
+	for (i = 0; i < ARRAY_LEN(_tokens); i++) {
+		if (!strcmp(_tokens[i].name, key)) {
+			_tokens[i].val = strdup(val);
+			return;
+		}
+	}
+	assert(0);
+}
+
+// Sets the local _class to a given Port/Platform from classes[]
+static int setClass(const char *port, const char *plat)
+{
+	int i;
+	for (i = 0; i < classes_count; i++) {
+		if (!strcmp(classes[i].port, port)) {
+			if (plat && classes[i].plat && !strcmp(classes[i].plat, plat)) {
+				_class = classes + i;
+				return 1;
+			}
+			else if (!classes[i].plat || !plat) {
+				_class = classes + i;
+				return 1;
+			}
+		}
+	}
+	return 0;
+}
+
+/* Algorithim
+	 while (chars in string)
+		if space, concat on end
+	if %
+		Copy off what we have sofar
+		Call ourself on value of token
+		Continue scanning
+*/
+
+/* src is destroyed */
+static char **subBuildArgs(char **args, char *template)
+{
+	char *src = template;
+	char *last = src;
+	static int quoting = 0;
+
+	/* Shared buffer between calls of this function. */
+	static char buffer[128];
+	static int indent = 0;
+
+	indent++;
+	while (*src) {
+		if (isspace(*src) && !quoting) {
+			/* End of set - add in the command */
+			*src = '\0';
+			strcat(buffer, last);
+			*args = strdup(buffer);
+			buffer[0] = '\0';
+			args++;
+			last = src + 1;
+		}
+		else if (*src == '%') {
+			/* Again copy off what we already have */
+			*src = '\0';
+			strcat(buffer, last);
+			*src = '%';
+			src++;
+			last = src;
+			while (*src != '%') {
+				if (!*src) {
+					/* End of string without closing % */
+					assert(0);
+				}
+				src++;
+			}
+			*src = '\0';
+			/* And recurse :) */
+			args = subBuildArgs(args, getTokenVal(last));
+			*src = '%';
+			last = src + 1;
+		}
+		else if (*src == '\"') {
+			quoting = !quoting;
+		}
+		src++;
+	}
+	strcat(buffer, last);
+	if (indent == 1) {
+		*args = strdup(buffer);
+		args++;
+		buffer[0] = '\0';
+	}
+
+	indent--;
+	return args;
+}
+
+static void buildArgs(char **args, const char *template)
+{
+	char *s = strdup(template);
+	char **last;
+	last = subBuildArgs(args, s);
+	*last = NULL;
+}
+
+// If order is changed here, file type handling MUST be updated
+// in lcc.c: "switch (suffix(name, suffixes, 5)) {"
+char *suffixes[] = {
+    EXT_C,               // 0
+    EXT_I,               // 1
+    EXT_ASM ";" EXT_S,   // 2
+    EXT_O   ";" EXT_OBJ, // 3
+    EXT_IHX,             // 4
+    EXT_GB,              // 5
+    0
+};
+
+char inputs[256] = "";
+
+char *cpp[256];
+char *include[256];
+char *com[256] = { "", "", "" };
+char *as[256];
+char *ihxcheck[256];
+char *ld[256];
+char *bankpack[256];
+char *mkbin[256];
+char *postproc[256];
+char *rom_extension;
+arg_entry *llist0_defaults;
+int llist0_defaults_len = 0;
+
+
+const char *starts_with(const char *s1, const char *s2)
+{
+	if (!strncmp(s1, s2, strlen(s2))) {
+		return s1 + strlen(s2);
+	}
+	return NULL;
+}
+
+int option(char *arg) {
+	const char *tail;
+	if ((tail = starts_with(arg, "--prefix="))) {
+		/* Go through and set all of the paths */
+		setTokenVal("prefix", tail);
+		return 1;
+	}
+	else if ((tail = starts_with(arg, "--gbdklibdir="))) {
+		setTokenVal("libdir", tail);
+		return 1;
+	}
+	else if ((tail = starts_with(arg, "--gbdkincludedir="))) {
+		setTokenVal("includedir", tail);
+		return 1;
+	}
+	else if ((tail = starts_with(arg, "--sdccbindir="))) {
+		// Allow to easily run with external SDCC snapshot / release
+		setTokenVal("sdccdir", tail);
+		return 1;
+	}
+	else if ((tail = starts_with(arg, "-S"))) {
+		// -S is compile to ASM only
+		// When composing the compile stage, swap in of -S instead of default -c
+		setTokenVal("comflag", "-S");
+	}
+	else if ((tail = starts_with(arg, "-no-crt"))) {
+		// When composing link stage, clear out crt0dir path
+		setTokenVal("crt0dir", "");
+	}
+	else if ((tail = starts_with(arg, "-no-libs"))) {
+		// When composing link stage, clear out crt0dir path
+		setTokenVal("libs_include", "");
+	}
+	else if ((tail = starts_with(arg, "-m"))) {
+		char word_count = 0;
+		char * p_str = strtok( strsave(tail),":"); // Copy arg str so it doesn't get unmodified by strtok()
+		char * words[3]; // +1 in size of expected number of entries to detect excess
+
+		// Split string into words separated by ':' chars (expecting PORT and PLAT)
+		while (p_str != NULL) {
+			words[word_count++] = p_str;
+			p_str = strtok(NULL, ":");
+			if (word_count >= ARRAY_LEN(words)) break;
+		}
+
+		// Requires both PORT and PLAT, must match a valid setClass entry.
+		if (word_count == 2) {
+			setTokenVal("port", words[0]);
+			setTokenVal("plat", words[1]);
+			if (!setClass(words[0], words[1])) {
+				fprintf(stderr, "Error: %s: unrecognised PORT:PLATFORM from %s:%s\n", progname, words[0], words[1]);
+				exit(-1);
+			}
+		} else {
+			fprintf(stderr, "Error: -m requires both/only PORT and PLATFORM values (ex: -msm83:gb) : %s\n", arg);
+			exit(-1);
+		}
+
+		return 1;
+	}
+	else if ((tail = starts_with(arg, "--model-"))) {
+		if (!strcmp(tail, "small")) {
+			setTokenVal("commodel", "small");
+			setTokenVal("libmodel", "small");
+			setTokenVal("cppmodel", "SDCC_MODEL_SMALL");
+			return 1;
+		}
+		else if (!strcmp(tail, "medium")) {
+			setTokenVal("commodel", "medium");
+			setTokenVal("libmodel", "medium");
+			setTokenVal("cppmodel", "SDCC_MODEL_MEDIUM");
+			return 1;
+		}
+	}
+	return 0;
+}
+
+// Build the port/platform specific toolchain command strings
+// and apply any related settings
+void finalise(void)
+{
+	if (!_class->plat) {
+		setTokenVal("plat", _class->default_plat);
+	}
+	buildArgs(cpp, _class->cpp);
+	buildArgs(include, _class->include);
+	buildArgs(com, _class->com);
+	buildArgs(as, _class->as);
+	buildArgs(bankpack, _class->bankpack);
+	buildArgs(ld, _class->ld);
+	buildArgs(ihxcheck, _class->ihxcheck);
+	buildArgs(mkbin, _class->mkbin);
+        if (strlen(_class->postproc) != 0) buildArgs(postproc, _class->postproc); else postproc[0] = '\0';
+	rom_extension = strdup(_class->rom_extension);
+	llist0_defaults = _class->llist0_defaults;
+	llist0_defaults_len = _class->llist0_defaults_len;
+}
+
+void set_gbdk_dir(char* argv_0)
+{
+	char buf[1024 - 2]; // Path will get quoted below, so reserve two characters for them
+#ifdef __WIN32__
+	char slash = '\\';
+	if (GetModuleFileName(NULL,buf, sizeof(buf)) == 0)
+	{
+		return;
+	}
+#else
+	char slash = '/';
+	strncpy(buf, argv_0, sizeof(buf));
+	buf[sizeof(buf) - 1] = '\0';
+#endif
+
+	// Strip of the trailing GBDKDIR/bin/lcc.exe and use it as the prefix.
+	char *p = strrchr(buf, slash);
+	if (p) {
+		while(p != buf && *(p - 1) == slash) //Fixes https://github.com/Zal0/gbdk-2020/issues/29
+			-- p;
+		*p = '\0';
+
+		p = strrchr(buf, slash);
+		if (p) {
+			*++p = '\0';
+			char quotedBuf[1024];
+			snprintf(quotedBuf, sizeof(quotedBuf), "\"%s\"", buf);
+			setTokenVal("prefix", quotedBuf);
+		}
+	}
+}
diff --git a/gbdk/gbdk-support/lcc/gb.h b/gbdk/gbdk-support/lcc/gb.h
new file mode 100644
index 00000000..51abf237
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/gb.h
@@ -0,0 +1,31 @@
+// gb.h
+
+#ifndef _LCC_GB_H
+#define _LCC_GB_H
+
+#define SUFX_NOMATCH -1
+
+#define EXT_C    ".c"
+#define EXT_I    ".i"
+#define EXT_ASM  ".asm"
+#define EXT_S    ".s"
+#define EXT_O    ".o"
+#define EXT_OBJ  ".obj"
+#define EXT_IHX  ".ihx"
+#define EXT_LK   ".lk"
+#define EXT_ROM  ".rom"
+
+// ROM file extensions
+#define EXT_GB     ".gb"
+#define EXT_AP     ".pocket"
+#define EXT_DUCK   ".duck"
+#define EXT_SMS    ".sms"
+#define EXT_GG     ".gg"
+#define EXT_MSXDOS ".com"
+
+#define ARRAY_LEN(A) (sizeof(A) / sizeof(A[0]))
+
+#endif // _LCC_GB_H
+
+
+
diff --git a/gbdk/gbdk-support/lcc/lcc.c b/gbdk/gbdk-support/lcc/lcc.c
new file mode 100644
index 00000000..c3d12a7c
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/lcc.c
@@ -0,0 +1,1188 @@
+/*
+ * lcc [ option ]... [ file | -llib ]...
+ * front end for the ANSI C compiler
+ */
+static char rcsid[] = "$Id: lcc.c,v 2.0 " BUILDDATE " " BUILDTIME " gbdk-2020 Exp $";
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>
+#include <ctype.h>
+#include <signal.h>
+
+#ifdef _WIN32
+# include <io.h>
+# include <process.h>
+#else
+# include <unistd.h>
+# include <sys/types.h>
+# include <sys/wait.h>
+#endif
+
+#include "gb.h"
+#include "list.h"
+#include "targets.h"
+
+#ifndef TEMPDIR
+#define TEMPDIR "/tmp"
+#endif
+
+void *alloc(int);
+extern char *basepath(char *);
+extern char *path_stripext(char *);
+extern char *path_newext(char *, char *);
+static int callsys(char *[]);
+extern char *concat(const char *, const char *);
+static void compose(char *[], List, List, List);
+static void error(char *, char *);
+static char *exists(char *);
+static char *first(char *);
+static int filename(char *, char *);
+static void help(void);
+static void initinputs(void);
+static void interrupt(int);
+static void opt(char *);
+extern int main(int, char *[]);
+extern char *replace(const char *, int, int);
+static void rm(List);
+extern char *strsave(const char *);
+extern char *stringf(const char *, ...);
+extern int suffix(char *, char *[], int);
+extern char *tempname(char *);
+
+static bool arg_has_searchkey(char *, char *);
+
+// Adds linker default required vars if not present (defined by user)
+static void Fixllist();
+
+static void handle_autobanking(void);
+
+
+// These get populated from _class using finalise() in gb.c
+extern char *cpp[], *include[], *com[], *as[], *bankpack[], *ld[], *ihxcheck[], *mkbin[], *postproc[], inputs[], *suffixes[], *rom_extension;
+extern arg_entry *llist0_defaults;
+extern int llist0_defaults_len;
+
+extern int option(char *);
+extern void set_gbdk_dir(char*);
+
+void finalise(void);
+
+static int errcnt;		/* number of errors */
+static int Eflag;		/* -E specified */
+static int Sflag;		/* -S specified */
+static int cflag;		/* -c specified */
+static int Kflag;		/* -K specified */
+static int autobankflag;	/* -K specified */
+int verbose;		/* incremented for each -v */
+static List bankpack_flags;	/* bankpack flags */
+static List ihxchecklist;	/* ihxcheck flags */
+static List mkbinlist;		/* loader files, flags */
+
+// Index entries for llist[]
+#define L_ARGS 0
+#define L_FILES 1
+#define L_LKFILES 2
+static List llist[3];       /* [2] = .lkfiles, [1] = linker object file list, [0] = linker flags */
+
+static List alist;		/* assembler flags */
+List clist;		/* compiler flags */
+static List plist;		/* preprocessor flags */
+static List ilist;		/* list of additional includes from LCCINPUTS */
+static List rmlist;		/* list of files to remove */
+static char *outfile;		/* ld output file or -[cS] object file */
+static int ac;			/* argument count */
+static char **av;		/* argument vector */
+char *tempdir = TEMPDIR;	/* directory for temporary files */
+char *progname;
+static List lccinputs;		/* list of input directories */
+char bankpack_newext[1024] = {'\0'};
+static int ihx_inputs = 0;  // Number of ihx files present in input list
+static char ihxFile[256] = {'\0'};
+static char binFile[256] = {'\0'};
+
+
+int main(int argc, char *argv[]) {
+	int i, j, nf;
+
+	progname = argv[0];
+	ac = argc + 50;
+	av = alloc(ac * sizeof(char *));
+	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
+		signal(SIGINT, interrupt);
+	if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
+		signal(SIGTERM, interrupt);
+#ifdef SIGHUP
+	if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
+		signal(SIGHUP, interrupt);
+#endif
+	if (getenv("TMP"))
+		tempdir = getenv("TMP");
+	else if (getenv("TEMP"))
+		tempdir = getenv("TEMP");
+	else if (getenv("TMPDIR"))
+		tempdir = getenv("TMPDIR");
+	assert(tempdir);
+
+	// Remove trailing slashes
+	i = strlen(tempdir);
+	for (; (i > 0) && ((tempdir[i - 1] == '/') || (tempdir[i - 1] == '\\')); i--)
+		tempdir[i - 1] = '\0';
+	if (argc <= 1) {
+		help();
+		exit(0);
+	}
+//	clist = append("-D__LCC__", 0);
+	initinputs();
+	if (getenv("GBDKDIR"))
+		option(stringf("--prefix=%s", getenv("GBDKDIR")));
+	else
+		set_gbdk_dir(argv[0]);
+	for (nf = 0, i = j = 1; i < argc; i++) {
+		if (strcmp(argv[i], "-o") == 0) {
+			if (++i < argc) {
+				// Don't allow output file to have ".c" or ".i" extension (first two in suffixes[])
+				if (suffix(argv[i], suffixes, 2) != SUFX_NOMATCH) {
+					error("-o would overwrite %s", argv[i]);
+					exit(8);
+				}
+				// Valid output file found
+				outfile = argv[i];
+				continue;
+			}
+			else {
+				error("unrecognized option `%s'", argv[i - 1]);
+				exit(8);
+			}
+		}
+		else if (strcmp(argv[i], "-target") == 0) {
+			if (argv[i + 1] && *argv[i + 1] != '-')
+				i++;
+			continue;
+		}
+		else if (*argv[i] == '-' && argv[i][1] != 'l') {
+			opt(argv[i]);
+			continue;
+		}
+		else if (*argv[i] != '-') {
+			// Count number of (.ihx) files
+			if (suffix(argv[i], (char * []){EXT_IHX}, 1) != SUFX_NOMATCH)
+				ihx_inputs++;
+			// Count number of (.c, .i, .asm, .s) files
+			else if (suffix(argv[i], suffixes, 3) != SUFX_NOMATCH)
+				nf++;
+		}
+		argv[j++] = argv[i];
+	}
+
+	// Ignore -o output request if:
+	// * compile only (-c) *OR* compile to ASM (-S) is specified
+	// * and there are 2 or more source files (.c, .i, .asm, .s) in the input list (what "nf" seems to count)
+	// Instead, it will generate output matching each input filename
+	if ((cflag || Sflag) && outfile && nf != 1) {
+		fprintf(stderr, "%s: -o %s ignored\n", progname, outfile);
+		outfile = 0;
+	}
+
+	// When .ihx is an input only ihxcheck and makebin will be called.
+	// Warn that all source files won't be processed
+	if ((ihx_inputs > 0) && (nf > 0)) {
+		fprintf(stderr, "%s: Warning: .ihx file present as input, all other input files ignored\n", progname);
+	}
+
+	// Add includes
+	argv[j] = 0;
+
+	// This copies settings from port:platform "class" structure
+	// into command strings used for compose()
+	finalise();
+
+	for (i = 0; include[i]; i++)
+		clist = append(include[i], clist);
+	if (ilist) {
+		List b = ilist;
+		do {
+			b = b->link;
+			clist = append(b->str, clist);
+		} while (b != ilist);
+	}
+	ilist = 0;
+	for (i = 1; argv[i]; i++)
+		// Process arguments
+		if (*argv[i] == '-')
+			opt(argv[i]);
+		else {
+			// Process filenames
+			char *name = exists(argv[i]);
+			if (name) {
+				if (strcmp(name, argv[i]) != 0
+					|| ((nf > 1) && (suffix(name, suffixes, 3) != SUFX_NOMATCH)) ) // Does it match: .c, .i, .asm, .s
+
+					fprintf(stderr, "%s:\n", name);
+				// Send input filename argument to "filename processor"
+				// which will add them to llist[n] in some form most of the time
+				filename(name, 0);
+			}
+			else
+				error("can't find `%s'", argv[i]);
+		}
+
+
+	// Perform Link / ihxcheck / makebin stages (unless some conditions prevent it)
+	if (errcnt == 0 && !Eflag && !cflag && !Sflag &&
+		(llist[L_FILES] || llist[L_LKFILES] || ((ihxFile[0] != '\0') && ihx_inputs))) {
+
+		int target_is_ihx = 0;
+
+		// if outfile is not specified, set it to default rom extension for active port:platform
+		if(!outfile)
+			outfile = concat("a", rom_extension);
+
+		// If an .ihx file is present as input skip link related stages
+		if (ihx_inputs > 0) {
+
+			// Only one .ihx can be used for input, warn that others will be ignored
+			if (ihx_inputs > 1)
+				fprintf(stderr, "%s: Warning: Multiple (%d) .ihx files present as input, only one (%s) will be used\n", progname, ihx_inputs, ihxFile);
+		}
+		else {
+
+			//file.gb to file.ihx (don't use tmpfile because maps and other stuffs are created there)
+			// Check to see if output target is a .ihx file
+			target_is_ihx = (suffix(outfile, (char *[]){EXT_IHX}, 1) != SUFX_NOMATCH);
+
+			// Build ihx file name from output name
+			sprintf(ihxFile, "%s%s", path_stripext(outfile), EXT_IHX);
+
+			// Only remove .ihx from the delete-list if it's not the final target
+			if (!target_is_ihx)
+				append(ihxFile, rmlist);
+
+			// If auto bank assignment is enabled, modify obj files before linking
+			// Will alter: llist[L_FILES] and llist[L_LKFILES]
+			if (autobankflag)
+				handle_autobanking();
+
+			// Copy any pending linkerfiles into the linker list (with "-f" as preceding arg)
+			llist[L_FILES] = list_add_to_another(llist[L_FILES], llist[L_LKFILES], NULL, "-f");
+			// Call linker (add output ihxfile in compose $3)
+			Fixllist();   // Fixlist adds required default linker vars if not added by user
+			compose(ld, llist[L_ARGS], llist[L_FILES], append(ihxFile, 0));
+
+			if (callsys(av))
+				errcnt++;
+		} // end: non-ihx input file handling
+
+		// ihxcheck (test for multiple writes to the same ROM address)
+		if (!Kflag) {
+			compose(ihxcheck, ihxchecklist, append(ihxFile, 0), 0);
+			if (callsys(av))
+				errcnt++;
+		}
+
+		// No need to makebin (.ihx -> .gb [or other rom_extension]) if .ihx is final target
+		if (!target_is_ihx)
+		{
+			if(errcnt == 0)
+			{
+                // makebin - use output filename unless there is a post-process step
+                if (strlen(postproc) == 0)
+                    sprintf(binFile, "%s", outfile);
+                else
+                    sprintf(binFile, "%s", path_newext(outfile, EXT_ROM));
+
+                compose(mkbin, mkbinlist, append(ihxFile, 0), append(binFile, 0));
+                if (callsys(av))
+                    errcnt++;
+
+                // post-process step (such as makecom), if applicable
+                if ((strlen(postproc) != 0) && (errcnt == 0)) {
+                    compose(postproc, append(binFile, 0), append(outfile, 0), 0);
+                    if (callsys(av))
+                        errcnt++;
+                }
+			}
+		}
+	}
+	rm(rmlist);
+    if (verbose > 0)
+        fprintf(stderr, "\n");
+	return errcnt ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+
+
+// Check whether string "arg" has "searchkey" at the first possible
+// occurrence of searchkey's starting character in arg (typically "." or "_")
+static bool arg_has_searchkey(char * arg, char * searchkey) {
+	char * str_start = strchr(arg, searchkey[0]);
+
+	if (str_start)
+		return (strncmp(str_start, searchkey, strlen(searchkey)) == 0);
+	else
+		return false;
+}
+
+
+// Adds linker default required vars if not present (defined by user)
+// Uses data from targets.c for per port/platform defaults
+static void Fixllist()
+{
+	int c;
+
+	// Iterate through linker list entries
+	if(llist[L_ARGS]) {
+		List b = llist[L_ARGS];
+		do {
+			b = b->link;
+			// Only -g and -b settings are supported at this time
+			if(b->str[1] == 'g' || b->str[1] == 'b')
+			{
+				// '-g' and '-b' now have their values separated by a space.
+				// That splits them into two consecutive llist items,
+				// so try advancing to the next item to access it's value.
+				// Example:  b = "-g", next = ".STACK=0xE000"
+				if (b != llist[L_ARGS])
+					b = b->link;
+				else
+					break; // end of list
+
+				// Check current linker arg to see if any default settings are present
+				// If they do, flag them as present so they don't need to be added later
+				for (c = 0; c < llist0_defaults_len; c++)
+					if (arg_has_searchkey(b->str, llist0_defaults[c].searchkey))
+						llist0_defaults[c].found = true;
+			}
+		} while (b != llist[L_ARGS]);
+	}
+
+	// Add required default settings to the linker list if they weren't found
+	for (c = 0; c < llist0_defaults_len; c++)
+		if (llist0_defaults[c].found == false) {
+			// Add the entry to the linker llist[L_ARGS], flag first then value
+			llist[L_ARGS] = append(llist0_defaults[c].addflag,  llist[L_ARGS]);
+			llist[L_ARGS] = append(llist0_defaults[c].addvalue, llist[L_ARGS]);
+		}
+}
+
+
+/* alloc - allocate n bytes or die */
+void *alloc(int n) {
+	static char *avail, *limit;
+
+	n = (n + sizeof(char *) - 1)&~(sizeof(char *) - 1);
+	if (n >= limit - avail) {
+		avail = malloc(n + 4 * 1024);
+		assert(avail);
+		limit = avail + n + 4 * 1024;
+	}
+	avail += n;
+	return avail - n;
+}
+
+
+/* basepath - return base name for name, e.g. /usr/drh/foo.c => foo */
+char *basepath(char *name) {
+	char *s, *b, *t = 0;
+
+	for (b = s = name; *s; s++)
+		if (*s == '/' || *s == '\\') {
+			b = s + 1;
+			t = 0;
+		}
+		else if (*s == '.')
+			t = s;
+	s = strsave(b);
+	if (t)
+		s[t - b] = 0;
+	return s;
+}
+
+// path_stripext - return a new string of path [name] with extension removed
+//              e.g. /usr/drh/foo.c => /usr/drh/foo
+char *path_stripext(char *name) {
+	char * copy_str = strsave(name);
+	char * end_str = copy_str + strlen(copy_str);
+
+	// Work from end of string backward,
+	// truncate string at first "." char
+	while (end_str > copy_str) {
+		if (*end_str == '.') {
+			*end_str = '\0';
+			break;
+		}
+		end_str--;
+	}
+	return copy_str;
+}
+
+
+// path_newext - return a new string of path [name] with extension replaced
+//              e.g. /usr/drh/foo.c => /usr/drh/foo
+char *path_newext(char *name, char *new_ext) {
+     return stringf("%s%s", path_stripext(name), new_ext);
+}
+
+
+// Check if an extension matches the end of a filename
+int matches_ext(const char * filename, const char * ext)
+{
+	// Only test match if filename is larger than extension
+	// Then check the end of the filename for [ext] length of chars
+	if (strlen(filename) >= strlen(ext))
+		return strncmp(filename + strlen(filename) - strlen(ext), ext, strlen(ext)) == 0;
+	else return 0;
+}
+
+
+#ifndef WIN32
+#define _P_WAIT 0
+
+static int _spawnvp(int mode, const char *cmdname, char *argv[]) {
+	int status;
+	pid_t pid, n;
+
+	switch (pid = fork()) {
+	case -1:
+		fprintf(stderr, "%s: no more processes\n", progname);
+		return 100;
+	case 0:
+		execv(cmdname, argv);
+		fprintf(stderr, "%s: ", progname);
+		perror(cmdname);
+		fflush(stdout);
+		exit(100);
+	}
+	while ((n = wait(&status)) != pid && n != -1)
+		;
+	if (n == -1)
+		status = -1;
+	if (status & 0377) {
+		fprintf(stderr, "%s: fatal error in %s\n", progname, cmdname);
+		status |= 0400;
+	}
+	return (status >> 8) & 0377;
+}
+#endif
+
+/* removes quotes from src and stores it on dst */
+void removeQuotes(char* src, char* dst)
+{
+	while(*src != '\0')
+	{
+		if(*src != '\"')
+    {
+      if(*dst != *src)
+				*(dst) = *src;
+      dst ++;
+    }
+		src ++;
+	}
+  if(*dst != '\0')
+	  *dst = '\0';
+}
+
+/* turns "C:\Users\Zalo\Desktop\gb\gbdk 2020\build\gbdk\"bin/sdcpp
+   into  "C:\Users\Zalo\Desktop\gb\gbdk 2020\build\gbdk\bin/sdcpp" */
+void fixQuotes(char* str)
+{
+	while(*str != '\"' && *str != '\0')
+		str ++;
+
+	char* src = str;
+	if(*src == '\"')
+	{
+		*(str ++) = '\"';
+		while(*src != '\0')
+		{
+			if(*src != '\"')
+				*(str ++) = *src;
+			src ++;
+		}
+		*(str ++) = '\"';
+		*(str ++) = '\0';
+	}
+}
+
+/* callsys - execute the command described by av[0...], return status */
+static int callsys(char **av) {
+	int i, status = 0;
+	static char **argv;
+	static int argc;
+
+	for (i = 0; av[i] != NULL; i++)
+		;
+	if (i + 1 > argc) {
+		argc = i + 1;
+		if (argv == NULL)
+			argv = malloc(argc * sizeof *argv);
+		else {
+			char **argv0 = argv;
+			argv = realloc(argv0, argc * sizeof *argv);
+			if (argv == NULL)
+				free(argv0);
+		}
+		assert(argv);
+	}
+	for (i = 0; status == 0 && av[i] != NULL; ) {
+		int j = 0;
+		char *s;
+		for (; av[i] != NULL && (s = strchr(av[i], '\n')) == NULL; i++)
+			argv[j++] = av[i];
+		if (s != NULL) {
+			if (s > av[i])
+				argv[j++] = stringf("%.*s", s - av[i], av[i]);
+			if (s[1] != '\0')
+				av[i] = s + 1;
+			else
+				i++;
+		}
+		argv[j] = NULL;
+		if (verbose > 0) {
+			int k;
+			fprintf(stderr, "%s", argv[0]);
+			for (k = 1; argv[k] != NULL; k++)
+				fprintf(stderr, " %s", argv[k]);
+			fprintf(stderr, "\n");
+		}
+		if (verbose < 2)
+		{
+			char argv_0_no_quotes[256];
+			removeQuotes(argv[0], argv_0_no_quotes);
+			for(char** it = argv; *it != 0; it ++)
+			{
+#ifdef __WIN32__
+				fixQuotes(*it); //On windows quotes must be kept, and fixed
+#else
+        removeQuotes(*it, *it); //On macos, quotes must be fully removed from args
+#endif
+			}
+			//For future reference:
+			//_spawnvp requires _FileName to not have quotes
+			//_Arguments must have quotes on windows, but not in macos
+			//Quoted strings must begin and end with quotes, no quotes in the middle
+			status = _spawnvp(_P_WAIT, argv_0_no_quotes, argv);
+		}
+		if (status == -1) {
+			fprintf(stderr, "%s: ", progname);
+			perror(argv[0]);
+		}
+	}
+	return status;
+}
+
+/* concat - return concatenation of strings s1 and s2 */
+char *concat(const char *s1, const char *s2) {
+	int n = strlen(s1);
+	char *s = alloc(n + strlen(s2) + 1);
+
+	strcpy(s, s1);
+	strcpy(s + n, s2);
+	return s;
+}
+
+/* compose - compose cmd into av substituting a, b, c for $1, $2, $3, resp. */
+static void compose(char *cmd[], List a, List b, List c) {
+	int i, j;
+	List lists[3];
+
+	lists[0] = a;
+	lists[1] = b;
+	lists[2] = c;
+	for (i = j = 0; cmd[i]; i++) {
+		char *s = strchr(cmd[i], '$');
+		if (s && isdigit(s[1])) {
+			int k = s[1] - '0';
+			assert(k >= 1 && k <= 3);
+			b = lists[k - 1];
+			if (b) {
+				b = b->link;
+				av[j] = alloc(strlen(cmd[i]) + strlen(b->str) - 1);
+				strncpy(av[j], cmd[i], s - cmd[i]);
+				av[j][s - cmd[i]] = '\0';
+				strcat(av[j], b->str);
+				strcat(av[j++], s + 2);
+				while (b != lists[k - 1]) {
+					b = b->link;
+					assert(j < ac);
+					av[j++] = b->str;
+				};
+			}
+		}
+		else if (*cmd[i]) {
+			assert(j < ac);
+			av[j++] = cmd[i];
+		}
+	}
+	av[j] = NULL;
+}
+
+/* error - issue error msg according to fmt, bump error count */
+static void error(char *fmt, char *msg) {
+	fprintf(stderr, "%s: ", progname);
+	fprintf(stderr, fmt, msg);
+	fprintf(stderr, "\n");
+	errcnt++;
+}
+
+/* exists - if `name' readable return its path name or return null */
+static char *exists(char *name) {
+	List b;
+
+	if ((name[0] == '/' || name[0] == '\\' || name[2] == ':')
+		&& access(name, 4) == 0)
+		return name;
+	if (!(name[0] == '/' || name[0] == '\\' || name[2] == ':')
+		&& (b = lccinputs))
+		do {
+			b = b->link;
+			if (b->str[0]) {
+				char buf[1024];
+				sprintf(buf, "%s/%s", b->str, name);
+				if (access(buf, 4) == 0)
+					return strsave(buf);
+			}
+			else if (access(name, 4) == 0)
+				return name;
+		} while (b != lccinputs);
+		if (verbose > 1)
+			return name;
+		return 0;
+}
+
+/* first - return first component in semicolon separated list */
+static char *first(char *list) {
+	char *s = strchr(list, ';');
+
+	if (s) {
+		char buf[1024];
+		size_t len = s - list;
+		if(len >= sizeof(buf)) len = sizeof(buf)-1;
+		strncpy(buf, list, len);
+		buf[len] = '\0';
+		return strsave(buf);
+	}
+	else
+		return list;
+}
+
+/* filename - process file name argument `name', return status */
+static int filename(char *name, char *base) {
+	int status = 0;
+	static char *stemp, *itemp;
+
+	if (base == 0)
+		base = basepath(name);
+
+	// Handle all available suffixes except .gb (last in list)
+	switch (suffix(name, suffixes, 5)) {
+	case 0:	/* C source files */
+		{
+			char *ofile;
+			if ((cflag || Sflag) && outfile)
+				ofile = outfile;
+			else if (cflag)
+				ofile = concat(base, EXT_O);
+			else if (Sflag) {
+				// When compiling to asm only, set outfile as .asm
+				ofile = concat(base, EXT_ASM);
+			}
+			else
+			{
+				ofile = tempname(EXT_O);
+
+				char* ofileBase = basepath(ofile);
+				rmlist = append(stringf("%s/%s%s", tempdir, ofileBase, EXT_ASM), rmlist);
+				rmlist = append(stringf("%s/%s%s", tempdir, ofileBase, ".lst"), rmlist);
+				rmlist = append(stringf("%s/%s%s", tempdir, ofileBase, ".sym"), rmlist);
+				rmlist = append(stringf("%s/%s%s", tempdir, ofileBase, ".adb"), rmlist);
+			}
+
+			compose(com, clist, append(name, 0), append(ofile, 0));
+			status = callsys(av);
+			if (!find(ofile, llist[L_FILES]))
+				llist[L_FILES] = append(ofile, llist[L_FILES]);
+		}
+		break;
+	case 2:	/* assembly language files */
+		if (Eflag)
+			break;
+		if (!Sflag) {
+			char *ofile;
+			if (cflag && outfile)
+				ofile = outfile;
+			else if (cflag)
+				ofile = concat(base, EXT_O);
+			else
+				ofile = tempname(EXT_O);
+			compose(as, alist, append(name, 0), append(ofile, 0));
+			status = callsys(av);
+			if (!find(ofile, llist[L_FILES]))
+				llist[L_FILES] = append(ofile, llist[L_FILES]);
+		}
+		break;
+	case 3:	/* object files */
+		if (!find(name, llist[L_FILES]))
+			llist[L_FILES] = append(name, llist[L_FILES]);
+		break;
+	case 4: // .ihx files
+		// Apply "name" as .ihx file (there can be only one as input)
+		strncpy(ihxFile, name, sizeof(ihxFile) - 1);
+		break;
+	default:
+		if (Eflag) {
+			compose(cpp, plist, append(name, 0), 0);
+			status = callsys(av);
+		}
+		llist[L_FILES] = append(name, llist[L_FILES]);
+		break;
+	}
+	if (status)
+		errcnt++;
+	return status;
+}
+
+/* help - print help message */
+static void help(void) {
+	static char *msgs[] = {
+"", " [ option | file ]...\n",
+"	except for -l, options are processed left-to-right before files\n",
+"	unrecognized options are taken to be linker options\n",
+"-A	warn about nonANSI usage; 2nd -A warns more\n",
+"-b	emit expression-level profiling code; see bprint(1)\n",
+#ifdef sparc
+"-Bstatic -Bdynamic	specify static or dynamic libraries\n",
+#endif
+"-Bdir/	use the compiler named `dir/rcc'\n",
+"-c	compile only\n",
+"-dn	set switch statement density to `n'\n",
+"-debug	Turns on --debug for compiler, -y (.cdb) and -j (.noi) for linker\n",
+"-Dname -Dname=def	define the preprocessor symbol `name'\n",
+"-E	run only the preprocessor on the named C programs and unsuffixed files\n",
+"-g	produce symbol table information for debuggers\n",
+"-help or -?	print this message\n",
+"-Idir	add `dir' to the beginning of the list of #include directories\n",
+"-K don't run ihxcheck test on linker ihx output\n",
+"-lx	search library `x'\n",
+"-m	select port and platform: \"-m[port]:[plat]\" ports:sm83,z80 plats:ap,duck,gb,sms,gg\n",
+"-N	do not search the standard directories for #include files\n",
+"-n	emit code to check for dereferencing zero pointers\n",
+"-no-crt do not auto-include the gbdk crt0.o runtime in linker list\n",
+"-no-libs do not auto-include the gbdk libs in linker list\n",
+"-O	is ignored\n",
+"-o file	leave the output in `file'\n",
+"-P	print ANSI-style declarations for globals\n",
+"-p -pg	emit profiling code; see prof(1) and gprof(1)\n",
+"-S	compile to assembly language\n",
+"-autobank auto-assign banks set to 255 (bankpack)\n"
+#ifdef linux
+"-static	specify static libraries (default is dynamic)\n",
+#endif
+"-t -tname	emit function tracing calls to printf or to `name'\n",
+"-target name	is ignored\n",
+"-tempdir=dir	place temporary files in `dir/'", "\n"
+"-Uname	undefine the preprocessor symbol `name'\n",
+"-v	show commands as they are executed; 2nd -v suppresses execution\n",
+"-w	suppress warnings\n",
+"-Woarg	specify system-specific `arg'\n",
+"-W[pfablim]arg	pass `arg' to the preprocessor, compiler, assembler, bankpack, linker, ihxcheck, or makebin\n",
+	0 };
+	int i;
+	char *s;
+
+	msgs[0] = progname;
+	for (i = 0; msgs[i]; i++) {
+		fprintf(stderr, "%s", msgs[i]);
+		if (strncmp("-tempdir", msgs[i], 8) == 0 && tempdir)
+			fprintf(stderr, "; default=%s", tempdir);
+	}
+#define xx(v) if ((s = getenv(#v))) fprintf(stderr, #v "=%s\n", s)
+	xx(LCCINPUTS);
+	xx(LCCDIR);
+#ifdef WIN32
+	xx(include);
+	xx(lib);
+#endif
+#undef xx
+}
+
+/* initinputs - if LCCINPUTS or include is defined, use them to initialize various lists */
+static void initinputs(void) {
+	char *s = getenv("LCCINPUTS");
+	List list, b;
+
+	if (s == 0 || (s = inputs)[0] == 0)
+		s = ".";
+	if (s) {
+		lccinputs = path2list(s);
+		b = lccinputs;
+		if (b)
+			do {
+				b = b->link;
+				if (strcmp(b->str, ".") != 0) {
+					ilist = append(concat("-I", b->str), ilist);
+					if (strstr(com[1], "win32") == NULL)
+						llist[L_ARGS] = append(concat("-L", b->str), llist[L_ARGS]);
+				}
+				else
+					b->str = "";
+			} while (b != lccinputs);
+	}
+#ifdef WIN32
+	if (list = b = path2list(getenv("include")))
+		do {
+			b = b->link;
+			ilist = append(stringf("-I\"%s\"", b->str), ilist);
+		} while (b != list);
+#endif
+}
+
+/* interrupt - catch interrupt signals */
+static void interrupt(int n) {
+	rm(rmlist);
+	exit(n = 100);
+}
+
+/* opt - process option in arg */
+static void opt(char *arg) {
+	switch (arg[1]) {	/* multi-character options */
+	case 'W':	/* -Wxarg */
+		if (arg[2] && arg[3])
+			switch (arg[2]) {
+			case 'o':
+				if (option(&arg[3]))
+					return;
+				break;
+			case 'p': /* Preprocessor */
+				clist = append(&arg[3], clist);
+				return;
+			case 'f': /* Compiler */
+				if (strcmp(&arg[3], "-C") || option("-b")) {
+					clist = append(&arg[3], clist);
+					return;
+				}
+				break; /* and fall thru */
+			case 'a': /* Assembler */
+				alist = append(&arg[3], alist);
+				return;
+			case 'i': /* ihxcheck arg list */
+				ihxchecklist = append(&arg[3], ihxchecklist);
+				return;
+			case 'b': /* auto bankpack_flags arg list */
+				bankpack_flags = append(&arg[3], bankpack_flags);
+				// -Wb-ext=[.some-extension]
+				// If bankpack is going to rewrite input object files to a new extension
+				// then save that extension for rewriting the linker list (llist[L_FILES])
+				if (strstr(&arg[3], "-ext=") != NULL) {
+					if (arg[8]) {
+						sprintf(bankpack_newext, "%s", &arg[8]);
+					}
+				}
+				return;
+			case 'l': /* Linker */
+				if(arg[4] == 'y' && (arg[5] == 't' || arg[5] == 'o' || arg[5] == 'a' || arg[5] == 'p') && (arg[6] != '\0' && arg[6] != ' '))
+					goto makebinoption; //automatically pass -yo -ya -yt -yp options to makebin (backwards compatibility)
+				{
+					// If using linker file for sdldgb (-f file[.lk]).
+					// Starting at arg[5] should be name of the linkerfile
+					if ((arg[4] == 'f') && (arg[5])) {
+						// Items in llist[L_LKFILES] get added to llist[L_FILES] right before the linker is called.
+						// That avoids sending to bankpack with the "-f" flag mixed in with the names of the .o object files.
+						llist[L_LKFILES] = append(stringf(&arg[5]), llist[L_LKFILES]);
+					} else {
+						//sdldgb requires spaces between -k and the path
+						llist[L_ARGS] = append(stringf("%c%c", arg[3], arg[4]), llist[L_ARGS]);     //splitting the args into 2 works on Win and Linux
+						if (arg[5]) {
+							llist[L_ARGS] = append(&arg[5], llist[L_ARGS]);  // Add filename separately if present
+						}
+					}
+				}
+				return;
+			case 'm': /* Makebin */
+			makebinoption:{
+				char *tmp = malloc(256);
+				char *tmp2 = malloc(256);
+				tmp2[0] = '\0'; // Zero out second arg by default
+				if (arg[4] == 'y') {
+					sprintf(tmp, "%c%c%c", arg[3], arg[4], arg[5]); //-yo -ya -yt -yl -yk -yn -yp
+					if (!(arg[5] == 'c' || arg[5] == 'C' || arg[5] == 's'  || arg[5] == 'S' || arg[5] == 'j' || arg[5] == 'p')) // Don't add second arg for -yc -yC -ys -yS -yj
+						sprintf(tmp2, "%s", &arg[6]);
+					// -yp of SDCC 4.1.0's makebin erroneously does not use a space between flag and it's value
+					// So append trailing values to first arg that would otherwise go in the second arg
+					if (arg[5] == 'p')
+						sprintf(tmp, "%s", &arg[3]);
+
+					// If MBC option is present for makebin (-Wl-yt <n> or -Wm-yt <n>) then make a copy for bankpack to use
+					if (arg[5] == 't')
+						bankpack_flags = append(&arg[3], bankpack_flags);
+				} else if ((arg[4] == 'x') && arg[5] && arg[6]) {
+					// SMS options
+					// Print "-" plus first two option chars into first arg
+					// and any trailing option chars into a separate arg
+					sprintf(tmp, "%c%c%c", arg[3], arg[4], arg[5]);  //-xo -xj -xv
+					if(arg[6])
+						sprintf(tmp2, "%s", &arg[6]);
+				} else {
+					sprintf(tmp, "%c%c", arg[3], arg[4]); //-s
+					if(arg[5])
+						sprintf(tmp2, "%s", &arg[5]);
+				}
+				mkbinlist = append(tmp, mkbinlist);
+				if (tmp2[0] != '\0')  // Only append second argument if it's populated
+					mkbinlist = append(tmp2, mkbinlist);
+				}return;
+			}
+		fprintf(stderr, "%s: %s ignored\n", progname, arg);
+		return;
+	case 'd':	/* -dn */
+		if (strcmp(arg, "-debug") == 0) {
+			// Load default debug options
+			clist    = append("--debug", clist);  // Debug for sdcc compiler
+			llist[L_ARGS] = append("-y", llist[L_ARGS]);    // Enable .cdb output for sdldgb linker
+			llist[L_ARGS] = append("-j", llist[L_ARGS]);    // Enable .noi output
+			return;
+		}
+
+		arg[1] = 's';
+		clist = append(arg, clist);
+		return;
+	case 't':	/* -t -tname -tempdir=dir */
+		if (strncmp(arg, "-tempdir=", 9) == 0)
+			tempdir = arg + 9;
+		else
+			clist = append(arg, clist);
+		return;
+	case 'p':	/* -p -pg */
+		if (option(arg))
+			clist = append(arg, clist);
+		else
+			fprintf(stderr, "%s: %s ignored\n", progname, arg);
+		return;
+	case 'D':	/* -Dname -Dname=def */
+	case 'U':	/* -Uname */
+	case 'I':	/* -Idir */
+		clist = append(arg, clist);
+		return;
+	case 'K':
+		Kflag++;
+		return;
+	case 'a':
+		if (strcmp(arg, "-autobank") == 0) {
+			autobankflag++;
+			return;
+		}
+	case 'n':
+		if (strcmp(arg, "-no-crt") == 0) {
+			option(arg);  // Clear crt0 entry in linker compose string
+			return;
+		}
+		else if (strcmp(arg, "-no-libs") == 0) {
+			option(arg);  // Clear libs entry in linker compose string
+			return;
+		}
+	case 'B':	/* -Bdir -Bstatic -Bdynamic */
+#ifdef sparc
+		if (strcmp(arg, "-Bstatic") == 0 || strcmp(arg, "-Bdynamic") == 0)
+			llist[L_FILES] = append(arg, llist[L_FILES]);
+		else
+#endif
+		{
+			static char *path;
+			if (path)
+				error("-B overwrites earlier option", 0);
+			path = arg + 2;
+			if (strstr(com[1], "win32") != NULL)
+				com[0] = concat(replace(path, '/', '\\'), concat("rcc", EXT_IHX));
+			else
+				com[0] = concat(path, "rcc");
+			if (path[0] == 0)
+				error("missing directory in -B option", 0);
+		}
+		return;
+	case 'h':
+		if (strcmp(arg, "-help") == 0) {
+			static int printed = 0;
+	case '?':
+		if (!printed)
+			help();
+		printed = 1;
+		return;
+		}
+#ifdef linux
+	case 's':
+		if (strcmp(arg, "-static") == 0) {
+			if (!option(arg))
+				fprintf(stderr, "%s: %s ignored\n", progname, arg);
+			return;
+		}
+#endif
+	}
+	if (arg[2] == 0)
+		switch (arg[1]) {	/* single-character options */
+		case 'S':        // Requested compile to assembly only
+			Sflag++;
+			option(arg); // Update composing the compile stage, use of -S instead of -c
+			return;
+		case 'O':
+			fprintf(stderr, "%s: %s ignored\n", progname, arg);
+			return;
+		case 'A': case 'n': case 'w': case 'P':
+			clist = append(arg, clist);
+			return;
+		case 'g': case 'b':
+			if (option(arg))
+				clist = append(arg[1] == 'g' ? "-g2" : arg, clist);
+			else
+				fprintf(stderr, "%s: %s ignored\n", progname, arg);
+			return;
+		case 'G':
+			if (option(arg)) {
+				clist = append("-g3", clist);
+				llist[L_ARGS] = append("-N", llist[L_ARGS]);
+			}
+			else
+				fprintf(stderr, "%s: %s ignored\n", progname, arg);
+			return;
+		case 'E':
+			Eflag++;
+			return;
+		case 'c':
+			cflag++;
+			return;
+		case 'N':
+			if (strcmp(basepath(cpp[0]), "gcc-cpp") == 0)
+				clist = append("-nostdinc", clist);
+			include[0] = 0;
+			ilist = 0;
+			return;
+		case 'v':
+			if (verbose++ == 0) {
+#if 0
+				/* GBDK removed */
+				if (strcmp(basepath(cpp[0]), "gcc-cpp") == 0)
+					clist = append(arg, clist);
+				clist = append(arg, clist);
+#endif
+				fprintf(stderr, "%s %s\n", progname, rcsid);
+			}
+			return;
+		}
+	if (option(arg))
+		return;
+	if (cflag || Sflag || Eflag)
+		fprintf(stderr, "%s: %s ignored\n", progname, arg);
+	else
+		llist[L_FILES] = append(arg, llist[L_FILES]);
+}
+
+
+/* replace - copy str, then replace occurrences of from with to, return the copy */
+char *replace(const char *str, int from, int to) {
+	char *s = strsave(str), *p = s;
+
+	for (; (p = strchr(p, from)) != NULL; p++)
+		*p = to;
+	return s;
+}
+
+/* rm - remove files in list */
+static void rm(List list) {
+	if (list) {
+		List b = list;
+		if (verbose)
+			fprintf(stderr, "rm");
+		do {
+			if (verbose)
+				fprintf(stderr, " %s", b->str);
+			if (verbose < 2)
+				remove(b->str);
+		} while ((b = b->link) != list);
+		if (verbose)
+			fprintf(stderr, "\n");
+	}
+}
+
+/* strsave - return a saved copy of string str */
+char *strsave(const char *str) {
+	return strcpy(alloc(strlen(str) + 1), str);
+}
+
+/* stringf - format and return a string */
+char *stringf(const char *fmt, ...) {
+	char buf[1024];
+	va_list ap;
+	int n;
+
+	va_start(ap, fmt);
+	n = vsnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+	return strsave(buf);
+}
+
+/* suffix - if one of tails[0..n-1] holds a proper suffix of name, return its index */
+int suffix(char *name, char *tails[], int n) {
+	int i, len = strlen(name);
+
+	for (i = 0; i < n; i++) {
+		char *s = tails[i], *t;
+		for (; (t = strchr(s, ';')); s = t + 1) {
+			int m = t - s;
+			if (len > m && strncmp(&name[len - m], s, m) == 0)
+				return i;
+		}
+		if (*s) {
+			int m = strlen(s);
+			if (len > m && strncmp(&name[len - m], s, m) == 0)
+				return i;
+		}
+	}
+	return SUFX_NOMATCH;
+}
+
+/* tempname - generate a temporary file name in tempdir with given suffix */
+char *tempname(char *suffix) {
+	static int n;
+	char *name = stringf("%s/lcc%d%d%s", tempdir, getpid(), n++, suffix);
+
+	if (strstr(com[1], "win32") != NULL)
+		name = replace(name, '/', '\\');
+	rmlist = append(name, rmlist);
+	return name;
+}
+
+
+// Performs the autobanking stage
+//
+// Should be called prior to doing compose() for the linker
+//
+static void handle_autobanking(void) {
+
+    // bankpack will be populated if supported by active port:platform
+    if (bankpack[0][0] != '\0') {
+
+        char * bankpack_linkerfile_name = tempname(EXT_LK);
+        rmlist = append(bankpack_linkerfile_name, rmlist); // Delete the linkerfile when done
+        // Always use a linkerfile when using bankpack through lcc
+        // Writes all input object files out to [bankpack_linkerfile_name]
+        bankpack_flags = append(stringf("%s%s","-lkout=", bankpack_linkerfile_name), bankpack_flags);
+
+        // Add linkerfile entries (usually *.lk) to the bankpack arg list if any are present
+        bankpack_flags = list_add_to_another(bankpack_flags, llist[L_LKFILES], "-lkin=", NULL);
+
+        // Prepare the bankpack command line, then execute it
+        compose(bankpack, bankpack_flags, llist[L_FILES], 0);
+        if (callsys(av))
+            errcnt++;
+
+        // Clear out the objects file and linkerfiles from their lists
+        // Then replace them with the filename passed to bankpack for "-lkout="
+        llist[L_FILES]   = list_remove_all(llist[L_FILES]);
+        llist[L_LKFILES] = list_remove_all(llist[L_LKFILES]);
+        llist[L_LKFILES] = append(stringf("%s", bankpack_linkerfile_name), llist[L_LKFILES]);
+    }
+    else
+        fprintf(stderr, "Warning: bankpack enabled but not supported by active port:platform\n");
+}
\ No newline at end of file
diff --git a/gbdk/gbdk-support/lcc/lcc.sln b/gbdk/gbdk-support/lcc/lcc.sln
new file mode 100644
index 00000000..ab150a4e
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/lcc.sln
@@ -0,0 +1,28 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25123.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "lcc", "lcc.vcxproj", "{2B573C10-5A15-4E77-8F33-804EABADC75B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Debug|x64.ActiveCfg = Debug|x64
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Debug|x64.Build.0 = Debug|x64
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Debug|x86.ActiveCfg = Debug|Win32
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Debug|x86.Build.0 = Debug|Win32
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Release|x64.ActiveCfg = Release|x64
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Release|x64.Build.0 = Release|x64
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Release|x86.ActiveCfg = Release|Win32
+		{2B573C10-5A15-4E77-8F33-804EABADC75B}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/gbdk/gbdk-support/lcc/lcc.vcxproj b/gbdk/gbdk-support/lcc/lcc.vcxproj
new file mode 100644
index 00000000..5881bc65
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/lcc.vcxproj
@@ -0,0 +1,148 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="gb.c" />
+    <ClCompile Include="lcc.c" />
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{2B573C10-5A15-4E77-8F33-804EABADC75B}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>lcc</RootNamespace>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)..\build\gbdk\bin\</OutDir>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;__WIN32__;_DEBUG;_CONSOLE;%(PreprocessorDefinitions);WIN32;__WIN32__</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions);WIN32;__WIN32__</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;__WIN32__;NDEBUG;_CONSOLE;%(PreprocessorDefinitions);WIN32;__WIN32__</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions);WIN32;__WIN32__</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/gbdk/gbdk-support/lcc/lcc.vcxproj.filters b/gbdk/gbdk-support/lcc/lcc.vcxproj.filters
new file mode 100644
index 00000000..828cb55b
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/lcc.vcxproj.filters
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="lcc\gb.c" />
+    <ClCompile Include="lcc\lcc.c" />
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/gbdk/gbdk-support/lcc/list.c b/gbdk/gbdk-support/lcc/list.c
new file mode 100644
index 00000000..f58005f1
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/list.c
@@ -0,0 +1,193 @@
+// list.c
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+//#include <assert.h>
+//#include <ctype.h>
+//#include <signal.h>
+
+#include "list.h"
+
+// From lcc.c
+extern void *alloc(int);
+extern char *strsave(const char *str);
+extern char *stringf(const char *fmt, ...);
+extern char *path_stripext(char *name);
+extern int matches_ext(const char * filename, const char * ext);
+extern int verbose;
+
+
+
+/* append - append a node with string str onto list, return new list */
+List append(char *str, List list) {
+    List p = alloc(sizeof *p);
+
+    p->str = str;
+    if (list) {
+        p->link = list->link;
+        list->link = p;
+    }
+    else
+        p->link = p;
+    return p;
+}
+
+
+/* find - find 1st occurrence of str in list, return list node or 0 */
+List find(char *str, List list) {
+    List b;
+
+    b = list;
+    if (b)
+        do {
+            if (strcmp(str, b->str) == 0)
+                return b;
+        } while ((b = b->link) != list);
+        return 0;
+}
+
+
+/* path2list - convert a colon- or semicolon-separated list to a list */
+List path2list(const char *path) {
+    List list = NULL;
+    char sep = ':';
+
+    if (path == NULL)
+        return NULL;
+    if (strchr(path, ';'))
+        sep = ';';
+    while (*path) {
+        char *p, buf[512];
+        p = strchr(path, sep);
+        if (p) {
+            size_t len = p - path;
+            if(len >= sizeof(buf)) len = sizeof(buf)-1;
+            strncpy(buf, path, len);
+            buf[len] = '\0';
+        }
+        else {
+            strncpy(buf, path, sizeof(buf));
+            buf[sizeof(buf)-1] = '\0';
+        }
+        if (!find(buf, list))
+            list = append(strsave(buf), list);
+        if (p == 0)
+            break;
+        path = p + 1;
+    }
+    return list;
+}
+
+
+// Replace extensions for filenames in a list
+void list_rewrite_exts(List list_in, char * ext_match, char * ext_new)
+{
+    char * filepath_old;
+
+    // Iterate through list and replace file extensions
+    if (list_in) {
+        List list_t = list_in;
+        do {
+            if (list_t->str) {
+                // Check to see if filname has desired extension
+                if (matches_ext(list_t->str, ext_match)) {
+
+                    // Save a copy to free after re-assignment
+                    filepath_old = list_t->str;
+                    // Create a new string with the replaced suffix (stringf() allocs)
+                    list_t->str = stringf("%s%s", path_stripext(list_t->str), ext_new);
+                    if (verbose > 0) fprintf(stderr,"lcc: rename link obj (from -autobank): %s -> %s\n", filepath_old, list_t->str);
+                }
+            }
+            // Move to next list item, exit if start of list is reached
+            list_t = list_t->link;
+        } while (list_t != list_in);
+    }
+}
+
+
+// Duplicate items with [ext_match] into new list items with [ext_new]
+void list_duplicate_to_new_exts(List list_in, char * ext_match, char * ext_new)
+{
+    // List may have entries appended, cache original start
+    List list_start = list_in;
+
+    // Iterate through list and replace file extensions
+    if (list_in) {
+        List list_t = list_in;
+        do {
+            if (list_t->str) {
+                // Check to see if filname has desired extension
+                if (matches_ext(list_t->str, ext_match)) {
+                    // Make a copy with the replaced extension into the list
+                    list_in = append(stringf("%s%s", path_stripext(list_t->str), ext_new), list_in);
+                    if (verbose > 0) fprintf(stderr,"lcc: add to rmlist (from -autobank): %s -> %s\n", list_t->str, stringf("%s%s", path_stripext(list_t->str), ext_new));
+                }
+            }
+            // Move to next list item, exit if start of list is reached
+            list_t = list_t->link;
+        } while (list_t != list_start);
+    }
+}
+
+
+// Remove all items from a list
+List list_remove_all(List list_in) {
+
+    // Well... the custom alloc() used for lists makes it hard to free their memory.
+    // Instead just set the list to NULL to erase it and let cleanup happen on program exit.
+    return NULL;
+
+    /*
+    List list_next;
+    // Iterate through list and free memory
+    if (list_in) {
+        List list_t = list_in->link; // Advance to next item
+        list_in->link = NULL; // Break list to create a stopping point
+
+        do {
+            // Copy next link before freeing the current item
+            list_next = list_t->link;
+            if (list_t) {
+                free(list_t);
+                list_t = NULL;
+            }
+            // Move to next list item, exit if start of list is reached
+            list_t = list_next;
+        } while (list_t && list_t->link);
+    }
+    return NULL;
+    */
+}
+
+
+// Copies all items from [list_src] to [list_dest]
+// * optionally prefix items from [list_src] with [str_prefix]
+// * optionally append() a separate [str_add_before] for each item in [list_src] (use for space separated flags)
+List list_add_to_another(List list_dest, List list_src, char * str_prefix, char * str_add_before) {
+
+    if (list_src) {
+        List list_t = list_src->link; // Start at first list item (list usually points to END)
+
+        // Iterate through [list_src] and copy into to [list_dest], exit once start is reached again
+        do {
+            if (list_t->str)
+                // Add str_add_before string as a separate item if present
+                if (str_add_before)
+                    list_dest = append( stringf("%s", str_add_before), list_dest);
+
+                // pre-pend string prefix if present
+                if (str_prefix)
+                    list_dest = append( stringf("%s%s", str_prefix, list_t->str), list_dest);
+                else
+                    list_dest = append( stringf("%s", list_t->str), list_dest);
+            // Move to next list item
+            list_t = list_t->link;
+        } while (list_t != list_src);
+    }
+
+    return list_dest; // Return updated list
+}
diff --git a/gbdk/gbdk-support/lcc/list.h b/gbdk/gbdk-support/lcc/list.h
new file mode 100644
index 00000000..cac291fc
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/list.h
@@ -0,0 +1,26 @@
+// list.h
+
+#include <stdbool.h>
+
+#ifndef _LCC_LIST_H
+#define _LCC_LIST_H
+
+
+typedef struct list *List;
+struct list {       /* circular list nodes: */
+    char *str;      /* option or file name */
+    List link;      /* next list element */
+};
+
+List append(char *, List);
+List find(char *, List);
+
+List path2list(const char *);
+
+void list_rewrite_exts(List, char *, char *);
+void list_duplicate_to_new_exts(List, char *, char *);
+List list_remove_all(List);
+List list_add_to_another(List, List, char *, char *);
+
+
+#endif // _LCC_LIST_H
diff --git a/gbdk/gbdk-support/lcc/targets.c b/gbdk/gbdk-support/lcc/targets.c
new file mode 100644
index 00000000..7e0d17b1
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/targets.c
@@ -0,0 +1,143 @@
+// targets.c
+
+#include "gb.h"
+#include "targets.h"
+
+// Default Linker list arguments
+//
+// These get processed in Fixllist()
+//
+// NOTE: Only -g and -b entries are supported by Fixllist() right now
+
+// Game Boy / Analogue Pocket / Megaduck
+arg_entry llist0_defaults_gb[] = {
+    {.searchkey= "_shadow_OAM=", .addflag= "-g",.addvalue= "_shadow_OAM=0xC000", .found= false},
+    {.searchkey= ".STACK=",      .addflag= "-g",.addvalue= ".STACK=0xE000",      .found= false},
+    {.searchkey= ".refresh_OAM=",.addflag= "-g",.addvalue= ".refresh_OAM=0xFF80",.found= false},
+    {.searchkey= "_DATA=",       .addflag= "-b",.addvalue= "_DATA=0xC0A0",       .found= false},
+    {.searchkey= "_CODE=",       .addflag= "-b",.addvalue= "_CODE=0x0200",       .found= false},
+};
+
+// SMS / GG
+arg_entry llist0_defaults_sms[] = {
+    {.searchkey= "_shadow_OAM=", .addflag= "-g",.addvalue= "_shadow_OAM=0xC000", .found= false},
+    {.searchkey= ".STACK=",      .addflag= "-g",.addvalue= ".STACK=0xDFF0",      .found= false},
+    {.searchkey= "_DATA=",       .addflag= "-b",.addvalue= "_DATA=0xC0C0",       .found= false},
+    {.searchkey= "_CODE=",       .addflag= "-b",.addvalue= "_CODE=0x0100",       .found= false},
+};
+
+// MSX
+arg_entry llist0_defaults_msxdos[] = {
+    {.searchkey= "_DATA=",       .addflag= "-b",.addvalue= "_DATA=0x8000",       .found= false},
+    {.searchkey= "_CODE=",       .addflag= "-b",.addvalue= "_CODE=0x0100",       .found= false},
+};
+
+// Port/Platform specific settings
+//
+// $1 are extra parameters passed using -W
+// $2 is the list of objects passed as parameters
+// $3 is the output file
+CLASS classes[] = {
+    // GB
+    { "sm83",      // port
+        "gb",       // plat
+        "gb",       // default_plat
+        EXT_GB,     // ROM file extension
+        "%cpp% %cppdefault% -DINT_16_BITS $1 $2 $3",
+        "%includedefault%",
+        "%com% %comdefault% -Wa%asdefault% -DINT_16_BITS $1 %comflag% $2 -o $3",
+        "%as_gb% %asdefault% $1 $3 $2",
+        "%bankpack% $1 $2",
+        "%ld_gb% -n -i $1 %libs_include% $3 %crt0dir% $2",
+        "%ihxcheck% $2 $1",
+        "%mkbin% -yN -Z $1 $2 $3",  // -yN: Don't paste in the Nintendo logo bytes for gameboy and clones (-Z)
+        "",
+        llist0_defaults_gb, ARRAY_LEN(llist0_defaults_gb),
+    },
+    // Analogue Pocket
+    { "sm83",      // port
+        "ap",       // plat
+        "ap",       // default_plat
+        EXT_AP,     // ROM file extension
+        "%cpp% %cppdefault% -DINT_16_BITS $1 $2 $3",
+        "%includedefault%",
+        "%com% %comdefault% -Wa%asdefault% -DINT_16_BITS $1 %comflag% $2 -o $3",
+        "%as_gb% %asdefault% $1 $3 $2",
+        "%bankpack% $1 $2",
+        "%ld_gb% -n -i $1 %libs_include% $3 %crt0dir% $2",
+        "%ihxcheck% $2 $1",
+        "%mkbin% -yN -Z $1 $2 $3",  // -yN: Don't paste in the Nintendo logo bytes for gameboy and clones (-Z)
+        "",
+        llist0_defaults_gb, ARRAY_LEN(llist0_defaults_gb), // Use GB linker list defaults
+    },
+    // Megaduck
+    { "sm83",      // port
+        "duck",     // plat
+        "duck",     // default_plat
+        EXT_DUCK,   // ROM file extension
+        "%cpp% %cppdefault% -DINT_16_BITS $1 $2 $3",
+        "%includedefault%",
+        "%com% %comdefault% -Wa%asdefault% -DINT_16_BITS $1 %comflag% $2 -o $3",
+        "%as_gb% %asdefault% $1 $3 $2",
+        "%bankpack% $1 $2",
+        "%ld_gb% -n -i $1 %libs_include% $3 %crt0dir% $2",
+        "%ihxcheck% $2 $1",
+        "%mkbin% -yN -Z $1 $2 $3",  // -yN: Don't paste in the Nintendo logo bytes for gameboy and clones (-Z)
+        "",
+        llist0_defaults_gb, ARRAY_LEN(llist0_defaults_gb), // Use GB linker list defaults
+    },
+
+    // SMS
+    { "z80",        // port
+        "sms",      // plat
+        "sms",      // default_plat
+        EXT_SMS,    // ROM file extension
+        "%cpp% %cppdefault% -DINT_16_BITS $1 $2 $3",
+        "%includedefault%",
+        "%com% %comdefault% -Wa%asdefault% -DINT_16_BITS $1 %comflag% $2 -o $3",
+        "%as_z80% %asdefault% $1 $3 $2",
+        "%bankpack% -plat=sms $1 $2",
+        "%ld_z80% -a sms -n -i $1 %libs_include% $3 %crt0dir% $2",
+        "%ihxcheck% $2 $1",
+        "%mkbin% -S -xj 4 $1 $2 $3",
+        "",
+        llist0_defaults_sms, ARRAY_LEN(llist0_defaults_sms),
+    },
+    // GG
+    { "z80",        // port
+        "gg",       // plat
+        "gg",       // default_plat
+        EXT_GG,     // ROM file extension
+        "%cpp% %cppdefault% -DINT_16_BITS $1 $2 $3",
+        "%includedefault%",
+        "%com% %comdefault% -Wa%asdefault% -DINT_16_BITS $1 %comflag% $2 -o $3",
+        "%as_z80% %asdefault% $1 $3 $2",
+        "%bankpack% -plat=sms $1 $2",
+        "%ld_z80% -a sms -n -i $1 %libs_include% $3 %crt0dir% $2",
+        "%ihxcheck% $2 $1",
+        "%mkbin% -S $1 $2 $3",
+        "",
+        llist0_defaults_sms, ARRAY_LEN(llist0_defaults_sms),  // Use SMS linker list defaults
+    },
+
+    // MSX
+    { "z80",        // port
+        "msxdos",   // plat
+        "msxdos",   // default_plat
+        EXT_MSXDOS, // ROM file extension
+        "%cpp% %cppdefault% -DINT_16_BITS $1 $2 $3",
+        "%includedefault%",
+        "%com% %comdefault% -Wa%asdefault% -DINT_16_BITS $1 %comflag% $2 -o $3",
+        "%as_z80% %asdefault% $1 $3 $2",
+        "%bankpack% -plat=sms $1 $2",
+        "%ld_z80% -a sms -n -i -j $1 %libs_include% $3 %crt0dir% $2",
+        "%ihxcheck% $2 $1",
+        "%mkbin% $1 $2 $3",
+        "%mkcom% $1 $2",
+        llist0_defaults_msxdos, ARRAY_LEN(llist0_defaults_msxdos),
+    }
+
+};
+
+int classes_count = ARRAY_LEN(classes);
+
diff --git a/gbdk/gbdk-support/lcc/targets.h b/gbdk/gbdk-support/lcc/targets.h
new file mode 100644
index 00000000..c355668f
--- /dev/null
+++ b/gbdk/gbdk-support/lcc/targets.h
@@ -0,0 +1,39 @@
+// targets.h
+
+#include <stdbool.h>
+
+#ifndef _LCC_TARGETS_H
+#define _LCC_TARGETS_H
+
+// For Linker list defaults (llist0)
+typedef struct arg_entry {
+    char searchkey[255];
+    char addflag[255];
+    char addvalue[255];
+    bool found;
+} arg_entry;
+
+// For Port/Platform specific settings
+typedef struct CLASS {
+    const char *port;
+    const char *plat;
+    const char *default_plat;
+    const char *rom_extension;
+    const char *cpp;
+    const char *include;
+    const char *com;
+    const char *as;
+    const char *bankpack;
+    const char *ld;
+    const char *ihxcheck;
+    const char *mkbin;
+    const char *postproc;
+    arg_entry  *llist0_defaults;
+    int         llist0_defaults_len;
+} CLASS;
+
+
+extern CLASS classes[];
+extern int classes_count;
+
+#endif // _TARGETS_H
diff --git a/gbdk/gbdk-support/makebin/Makefile b/gbdk/gbdk-support/makebin/Makefile
new file mode 100644
index 00000000..e1bf87c4
--- /dev/null
+++ b/gbdk/gbdk-support/makebin/Makefile
@@ -0,0 +1,30 @@
+# bankcheck (auto bank tool) makefile
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+CC = $(TOOLSPREFIX)gcc
+CFLAGS = -ggdb -O -Wno-incompatible-pointer-types -DGBDKLIBDIR=\"$(TARGETDIR)\"
+OBJ = makebin.o
+BIN = makebin
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+
+clean:
+	rm -f *.o $(BIN) *~
+	rm -f *.exe
+
diff --git a/gbdk/gbdk-support/makebin/makebin.c b/gbdk/gbdk-support/makebin/makebin.c
new file mode 100644
index 00000000..b279a539
--- /dev/null
+++ b/gbdk/gbdk-support/makebin/makebin.c
@@ -0,0 +1,1022 @@
+/*
+  makebin - turn a .ihx file into a binary image or GameBoy format binaryimage
+
+  Copyright (c) 2000 Michael Hope
+  Copyright (c) 2010 Borut Razem
+  Copyright (c) 2012 Noel Lemouel
+  Copyright (c) 2020-2021 Sebastian 'basxto' Riedel
+  Copyright (c) 2020 'bbbbbr'
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+
+#if defined(_WIN32)
+#include <fcntl.h>
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+
+
+typedef unsigned char BYTE;
+
+#define FILL_BYTE 0xff
+
+int
+getnibble (FILE *fin)
+{
+  int ret;
+  int c = getc (fin);
+
+  if (feof (fin) || ferror (fin))
+    {
+      fprintf (stderr, "error: unexpected end of file.\n");
+      exit (6);
+    }
+
+  ret = c - '0';
+  if (ret > 9)
+    {
+      ret -= 'A' - '9' - 1;
+    }
+
+  if (ret > 0xf)
+    {
+       ret -= 'a' - 'A';
+    }
+
+  if (ret < 0 || ret > 0xf)
+    {
+      fprintf (stderr, "error: character %02x.\n", ret);
+      exit (7);
+    }
+  return ret;
+}
+
+int
+getbyte (FILE *fin, int *sum)
+{
+  int b = (getnibble (fin) << 4) | getnibble (fin);
+  *sum += b;
+  return b;
+}
+
+void
+usage (void)
+{
+  fprintf (stderr,
+           "makebin: convert a Intel IHX file to binary or GameBoy format binary.\n"
+           "Usage: makebin [options] [<in_file> [<out_file>]]\n"
+           "Options:\n"
+           "  -p             pack mode: the binary file size will be truncated to the last occupied byte\n"
+           "  -s romsize     size of the binary file (default: rom banks * 16384)\n"
+           "  -Z             generate GameBoy format binary file\n"
+           "  -S             generate Sega Master System format binary file\n"
+           "  -t size        skip size bytes from the beginning of the rom"
+
+           "SMS format options (applicable only with -S option):\n"
+           "  -xo n          rom size (0xa-0x2)\n"
+           "  -xj n          set region code (3-7)\n"
+           //"  -xc n          product code (0-159999)\n"
+           "  -xv n          version number (0-15)\n"
+           //"  -xV n          SDSC version number\n"
+           //"  -xd n          SDSC date\n"
+           //"  -xA n          SDSC author pointer\n"
+           //"  -xn n          SDSC program name pointer\n"
+           //"  -xD n          SDSC description pointer\n"
+
+           "GameBoy format options (applicable only with -Z option):\n"
+           "  -yo n          number of rom banks (default: 2) (autosize: A)\n"
+           "  -ya n          number of ram banks (default: 0)\n"
+           "  -yt n          MBC type (default: no MBC)\n"
+           "  -yl n          old licensee code (default: 0x33)\n"
+           "  -yk cc         new licensee string (default: 00)\n"
+           "  -yn name       cartridge name (default: none)\n"
+           "  -yc            GameBoy Color compatible\n"
+           "  -yC            GameBoy Color only\n"
+           "  -ys            Super GameBoy\n"
+           "  -yS            Convert .noi file named like input file to .sym\n"
+           "  -yj            set non-Japanese region flag\n"
+           "  -yN            do not copy big N validation logo into ROM header\n"
+           "  -yp addr=value Set address in ROM to given value (address 0x100-0x1FE)\n"
+           "Arguments:\n"
+           "  <in_file>      optional IHX input file, '-' means stdin. (default: stdin)\n"
+           "  <out_file>     optional output file, '-' means stdout. (default: stdout)\n");
+}
+
+#define CART_NAME_LEN 16
+
+struct gb_opt_s
+{
+  char cart_name[CART_NAME_LEN];  /* cartridge name buffer */
+  char licensee_str[2];           /* new licensee string */
+  BYTE mbc_type;                  /* MBC type (default: no MBC) */
+  short nb_rom_banks;             /* Number of rom banks (default: 2) */
+  BYTE nb_ram_banks;              /* Number of ram banks (default: 0) */
+  BYTE licensee_id;               /* old licensee code */
+  BYTE is_gbc;                    /* 1 if GBC compatible, 2 if GBC only, false for all other*/
+  BYTE is_sgb;                    /* True if SGB, false for all other*/
+  BYTE sym_conversion;            /* True if .noi file should be converted to .sym (default false)*/
+  BYTE non_jp;                    /* True if non-Japanese region, false for all other*/
+  BYTE rom_banks_autosize;        /* True if rom banks should be auto-sized (default false)*/
+  bool do_logo_copy;              /* True if the nintendo logo should be copied into the ROM (default true) */
+  BYTE address_overwrite[16];     /* For limited compatibility with very old versions */
+};
+
+struct sms_opt_s
+{
+  BYTE rom_size;                  /* Doesn't have to be the real size, needed for checksum */
+  BYTE region_code;               /* Region code Japan/Export/International and SMS/GG */
+  BYTE version;                   /* Game version */
+};
+
+void
+gb_postproc (BYTE * rom, int size, int *real_size, struct gb_opt_s *o)
+{
+  int i, chk;
+  static const BYTE gb_logo[] =
+    {
+      0xce, 0xed, 0x66, 0x66, 0xcc, 0x0d, 0x00, 0x0b,
+      0x03, 0x73, 0x00, 0x83, 0x00, 0x0c, 0x00, 0x0d,
+      0x00, 0x08, 0x11, 0x1f, 0x88, 0x89, 0x00, 0x0e,
+      0xdc, 0xcc, 0x6e, 0xe6, 0xdd, 0xdd, 0xd9, 0x99,
+      0xbb, 0xbb, 0x67, 0x63, 0x6e, 0x0e, 0xec, 0xcc,
+      0xdd, 0xdc, 0x99, 0x9f, 0xbb, 0xb9, 0x33, 0x3e
+    };
+
+  /* $0104-$0133: Nintendo logo
+   * If missing, an actual Game Boy won't run the ROM.
+   */
+
+  if (o->do_logo_copy)
+    {
+      memcpy (&rom[0x104], gb_logo, sizeof (gb_logo));
+    }
+
+  rom[0x144] = o->licensee_str[0];
+  rom[0x145] = o->licensee_str[1];
+
+  /*
+   * 0134-0142: Title of the game in UPPER CASE ASCII. If it
+   * is less than 16 characters then the
+   * remaining bytes are filled with 00's.
+   */
+
+  /* capitalize cartridge name */
+  for (i = 0; i < CART_NAME_LEN; ++i)
+    {
+      rom[0x134 + i] = toupper (o->cart_name[i]);
+    }
+
+  if (o->is_gbc == 1)
+    {
+      rom[0x143] = 0x80;
+    }
+
+  if (o->is_gbc == 2)
+    {
+      rom[0x143] = 0xC0;
+    }
+
+  if (o->is_sgb)
+    {
+      rom[0x146] = 0x03;
+    }
+
+  /*
+   * 0147: Cartridge type:
+   * 0-ROM ONLY            12-ROM+MBC3+RAM
+   * 1-ROM+MBC1            13-ROM+MBC3+RAM+BATT
+   * 2-ROM+MBC1+RAM        19-ROM+MBC5
+   * 3-ROM+MBC1+RAM+BATT   1A-ROM+MBC5+RAM
+   * 5-ROM+MBC2            1B-ROM+MBC5+RAM+BATT
+   * 6-ROM+MBC2+BATTERY    1C-ROM+MBC5+RUMBLE
+   * 8-ROM+RAM             1D-ROM+MBC5+RUMBLE+SRAM
+   * 9-ROM+RAM+BATTERY     1E-ROM+MBC5+RUMBLE+SRAM+BATT
+   * B-ROM+MMM01           1F-Pocket Camera
+   * C-ROM+MMM01+SRAM      FD-Bandai TAMA5
+   * D-ROM+MMM01+SRAM+BATT FE - Hudson HuC-3
+   * F-ROM+MBC3+TIMER+BATT FF - Hudson HuC-1
+   * 10-ROM+MBC3+TIMER+RAM+BATT
+   * 11-ROM+MBC3
+   */
+  rom[0x147] = o->mbc_type;
+
+  /*
+   * 0148 ROM size:
+   * 0 - 256Kbit = 32KByte = 2 banks
+   * 1 - 512Kbit = 64KByte = 4 banks
+   * 2 - 1Mbit = 128KByte = 8 banks
+   * 3 - 2Mbit = 256KByte = 16 banks
+   * 4 - 4Mbit = 512KByte = 32 banks
+   * 5 - 8Mbit = 1MByte = 64 banks
+   * 6 - 16Mbit = 2MByte = 128 banks
+   * $52 - 9Mbit = 1.1MByte = 72 banks
+   * $53 - 10Mbit = 1.2MByte = 80 banks
+   * $54 - 12Mbit = 1.5MByte = 96 banks
+   */
+  switch (o->nb_rom_banks)
+    {
+    case 2:
+      rom[0x148] = 0;
+      break;
+
+    case 4:
+      rom[0x148] = 1;
+      break;
+
+    case 8:
+      rom[0x148] = 2;
+      break;
+
+    case 16:
+      rom[0x148] = 3;
+      break;
+
+    case 32:
+      rom[0x148] = 4;
+      break;
+
+    case 64:
+      rom[0x148] = 5;
+      break;
+
+    case 128:
+      rom[0x148] = 6;
+      break;
+
+    case 256:
+      rom[0x148] = 7;
+      break;
+
+    case 512:
+      rom[0x148] = 8;
+      break;
+
+    default:
+      fprintf (stderr, "warning: unsupported number of ROM banks (%d)\n", o->nb_rom_banks);
+      rom[0x148] = 0;
+      break;
+    }
+
+  /*
+   * 0149 RAM size:
+   * 0 - None
+   * 1 - 16kBit = 2kB = 1 bank
+   * 2 - 64kBit = 8kB = 1 bank
+   * 3 - 256kBit = 32kB = 4 banks
+   * 4 - 1MBit =128kB =16 banks
+   */
+  switch (o->nb_ram_banks)
+    {
+    case 0:
+      rom[0x149] = 0;
+      break;
+
+    case 1:
+      rom[0x149] = 2;
+      break;
+
+    case 4:
+      rom[0x149] = 3;
+      break;
+
+    case 16:
+      rom[0x149] = 4;
+      break;
+
+    default:
+      fprintf (stderr, "warning: unsupported number of RAM banks (%d)\n", o->nb_ram_banks);
+      rom[0x149] = 0;
+      break;
+    }
+
+  rom[0x14A] = o->non_jp;
+
+  rom[0x14B] = o->licensee_id;
+
+  for (i = 0; i < 16; i+=2)
+    {
+      if(o->address_overwrite[i] != 0xFF)
+        {
+          rom[0x0100 & o->address_overwrite[i]] = o->address_overwrite[i+1];
+          // warnings for builds ported from ancient GBDK
+          fprintf (stderr, "caution: -yp0x01%02x=0x%02x is outdated", o->address_overwrite[i], o->address_overwrite[i+1]);
+          if(o->address_overwrite[i] == 0x43)
+            switch(o->address_overwrite[i+1]&0xC0)
+              {
+              case 0x80:
+                fprintf (stderr, ", please use -yc instead");
+                break;
+              case 0xC0:
+                fprintf (stderr, ", please use -yC instead");
+                break;
+              default:
+                o->address_overwrite[i] = 0xFF;
+              }
+          if(o->address_overwrite[i] == 0x44 || o->address_overwrite[i] == 0x45)
+              fprintf (stderr, ", please use -yk cc instead");
+          if(o->address_overwrite[i] == 0x46)
+            if(o->address_overwrite[i+1] == 0x03)
+              fprintf (stderr, ", please use -ys instead");
+            else
+              o->address_overwrite[i] = 0xFF;
+          if(o->address_overwrite[i] == 0x47)
+            fprintf (stderr, ", please use -yt 0x%02x instead", o->address_overwrite[i+1]);
+          if(o->address_overwrite[i] == 0x4A)
+            fprintf (stderr, ", please use -yl 0x%02x instead", o->address_overwrite[i+1]);
+          if(o->address_overwrite[i] == 0x4B && o->address_overwrite[i+1] == 1)
+            fprintf (stderr, ", please use -yj instead");
+          if(o->address_overwrite[i] == 0xFF)
+            fprintf (stderr, ", this setting is the default");
+          fprintf (stderr, ".\n");
+        }
+    }
+
+  /* Update complement checksum */
+  chk = 0;
+  for (i = 0x134; i < 0x14d; ++i)
+    chk += rom[i];
+  rom[0x014d] = (unsigned char) (0xe7 - (chk & 0xff));
+
+  /* Update checksum */
+  chk = 0;
+  rom[0x14e] = 0;
+  rom[0x14f] = 0;
+  for (i = 0; i < size; ++i)
+    chk += rom[i];
+  rom[0x14e] = (unsigned char) ((chk >> 8) & 0xff);
+  rom[0x14f] = (unsigned char) (chk & 0xff);
+
+  if (*real_size < 0x150)
+    *real_size = 0x150;
+}
+
+void
+sms_postproc (BYTE * rom, int size, int *real_size, struct sms_opt_s *o)
+{
+  // based on https://www.smspower.org/Development/ROMHeader
+  // 0x1ff0 and 0x3ff0 are also possible, but never used
+  static const char tmr_sega[] = "TMR SEGA  ";
+  short header_base = 0x7ff0;
+  int chk = 0;
+  unsigned long i;
+  // choose earlier positions for smaller roms
+  if (header_base > size)
+    header_base = 0x3ff0;
+  if (header_base > size)
+    header_base = 0x1ff0;
+
+  memcpy (&rom[header_base], tmr_sega, sizeof (tmr_sega) - 1);
+  // configure amounts of bytes to check
+  switch(o->rom_size)
+    {
+      case 0xa:
+      default:
+        i = 0x1FEF;
+        break;
+      case 0xb:
+        i = 0x3FEF;
+        break;
+      case 0xc:
+        i = 0x7FEF;
+        break;
+      case 0xd:
+        i = 0xBFEF;
+        break;
+      case 0xe:
+        i = 0xFFFF;
+        break;
+      case 0xf:
+        i = 0x1FFFF;
+        break;
+      case 0x0:
+        i = 0x3FFFF;
+        break;
+      case 0x1:
+        i = 0x7FFFF;
+        break;
+      case 0x2:
+        i = 0xFFFFF;
+        break;
+    }
+  // calculate checksum
+  for(;i > 0; --i)
+    {
+      chk += rom[i];
+      // 0x7FF0 - 0x7FFF is skipped
+      if(i == 0x8000)
+        i = 0x7FF0;
+    }
+  // we  skipped index 0
+  chk += rom[0];
+  // little endian
+  rom[header_base + 0xa] = chk & 0xff;
+  rom[header_base + 0xb] = (chk>>8) & 0xff;
+  // game version
+  rom[header_base + 0xe] &= 0xF0;
+  rom[header_base + 0xe] |= o->version;
+  // rom size
+  rom[header_base + 0xf] = (o->region_code << 4) | o->rom_size;
+}
+
+int
+rom_autosize_grow(BYTE **rom, int test_size, int *size, struct gb_opt_s *o)
+{
+  int last_size = *size;
+
+  while ((test_size > *size) && (o->nb_rom_banks <= 512))
+    {
+      o->nb_rom_banks *= 2;
+      // banks work differently for mbc6, they have half the size
+      // but this in general ignored by -yo
+      *size = o->nb_rom_banks * 0x4000;
+    }
+
+  if (o->nb_rom_banks > 512)
+    {
+      fprintf (stderr, "error: auto-size banks exceeded max of 512 banks.\n");
+      return 0;
+    }
+  else
+    {
+      BYTE * t_rom = *rom;
+      *rom = realloc (*rom, *size);
+      if (*rom == NULL)
+        {
+          free(t_rom);
+          fprintf (stderr, "error: couldn't re-allocate size for larger rom image.\n");
+          return 0;
+        }
+      memset (*rom + last_size, FILL_BYTE, *size - last_size);
+    }
+
+  return 1;
+}
+
+int
+noi2sym (char *filename)
+{
+  FILE *noi, *sym;
+  char *nname, *sname;
+  //ssize_t read;
+  char read = ' ';
+  // no$gmb's implementation is limited to 32 character labels
+  // we can safely throw away the rest
+  char label[33];
+  // 0x + 6 digit hex number
+  // -> 65536 rom banks is the maximum homebrew cartrideges support (TPP1)
+  char value[9];
+  int name_len = strlen(filename);
+  int i = 0;
+  // copy filename's value to nname and sname
+  nname = malloc((name_len+1) * sizeof(char));
+  strcpy (nname, filename);
+  sname = malloc((name_len+1) * sizeof(char));
+  strcpy (sname, filename);
+  // change the extensions
+  nname[name_len-1]='i';
+  nname[name_len-2]='o';
+  nname[name_len-3]='n';
+  sname[name_len-1]='m';
+  sname[name_len-2]='y';
+  sname[name_len-3]='s';
+
+  if (NULL == (noi = fopen (nname, "r")))
+    {
+      fprintf (stderr, "error: can't open %s: ", nname);
+      perror(NULL);
+      return 1;
+    }
+  if (NULL == (sym = fopen (sname, "w")))
+    {
+      fprintf (stderr, "error: can't create %s: ", sname);
+      perror(NULL);
+      return 1;
+    }
+  // write header
+  fprintf (sym, "; no$gmb compatible .sym file\n; Generated automagically by makebin\n");
+  // iterate through .noi file
+  while (read != EOF && (read = fgetc(noi)) != EOF)
+    {
+      // just skip line breaks
+      if (read == '\r' || read == '\n')
+        continue;
+      // read first 4 chars
+      for (i = 0; i < 4; ++i)
+        {
+          value[i] = read;
+          if ((read = fgetc(noi)) == EOF || read == '\r' || read == '\n')
+            {
+              // leave for-loop
+              break;
+            }
+        }
+      // we left loop early
+      if (i != 4)
+        continue;
+      // only accept if line starts with this
+      if (strncmp(value, "DEF ", 4) == 0)
+        {
+          // read label
+          for (i = 0; i < 32; ++i)
+            {
+              label[i] = read;
+              if ((read = fgetc(noi)) == EOF || read == '\r' || read == '\n' || read == ' ')
+                {
+                  // leave for-loop
+                  break;
+                }
+            }
+          // skip rest of the label
+          while (read != EOF && read != '\r' && read != '\n' && read != ' ')
+            read = fgetc(noi);
+          // it has to be end of file or line if it's not space
+          if (read != ' ')
+            continue;
+          // strings have to end with \0
+          label[i+1] = '\0';
+          // read value
+          for (i = 0; i < 8; ++i)
+            {
+              value[i] = read;
+              if ((read = fgetc(noi)) == EOF || read == '\r' || read == '\n')
+                {
+                  // leave for-loop
+                  break;
+                }
+            }
+          // number is too long; ignore
+          if (read != EOF && read != '\r' && read != '\n')
+            continue;
+          value[i+1] = '\0';
+          // we successfully read label and value
+
+          // but filter out some invalid symbols
+          if (strcmp(label, ".__.ABS.") != 0 && strncmp(label, "l__", 3) != 0)
+            fprintf (sym, "%02X:%04X %s\n", (unsigned int)(strtoul(value, NULL, 0)>>16), (unsigned int)strtoul(value, NULL, 0)&0xFFFF, label);
+        }
+      else
+        // skip until file/line end
+        while ((read = fgetc(noi))!= EOF && read != '\r' && read != '\n');
+    }
+
+  // free close files
+  fclose (noi);
+  fclose (sym);
+
+  fprintf (stderr, "Converted %s to %s.\n", nname, sname);
+  return 0;
+}
+
+int
+read_ihx (FILE *fin, BYTE **rom, int *size, int *real_size, struct gb_opt_s *o)
+{
+  int record_type;
+
+  int extaddr = 0;
+  do
+    {
+      int nbytes;
+      int addr;
+      int checksum, sum = 0;
+
+      if (getc (fin) != ':')
+        {
+          fprintf (stderr, "error: invalid IHX line.\n");
+          return 0;
+        }
+      nbytes = getbyte (fin, &sum);
+      addr = getbyte (fin, &sum) << 8 | getbyte (fin, &sum);
+      record_type = getbyte (fin, &sum);
+      if(record_type == 4)
+        {
+          extaddr = getbyte (fin, &sum) << 8 | getbyte (fin, &sum);
+          extaddr <<= 16; // those are the upper 16 bits
+          checksum = getbyte (fin, &sum);
+          // move to the next record
+          if (0 != (sum & 0xff))
+            {
+              fprintf (stderr, "error: bad checksum: %02x.\n", checksum);
+              return 0;
+            }
+          while (isspace (sum = getc (fin)))  /* skip all kind of spaces */
+            ;
+          ungetc (sum, fin);
+          if (getc (fin) != ':')
+            {
+              fprintf (stderr, "error: invalid IHX line.\n");
+              return 0;
+            }
+          // parse real data part
+          checksum = sum = 0;
+          nbytes = getbyte (fin, &sum);
+          // lower 16 bits
+          addr = getbyte (fin, &sum) << 8 | getbyte (fin, &sum);
+          record_type = getbyte (fin, &sum);
+        }
+      // add linear address extension
+      addr |= extaddr;
+      // TODO: warn for unreachable banks according to chosen MBC
+      if (record_type > 1)
+        {
+          fprintf (stderr, "error: unsupported record type: %02x.\n", record_type);
+          return 0;
+        }
+
+      if (addr + nbytes > *size)
+        {
+          // If auto-size is enabled, grow rom bank size by power of 2 when needed
+          if (o->rom_banks_autosize)
+            {
+              if (rom_autosize_grow(rom, addr + nbytes, size, o) == 0)
+                return 0;
+            }
+          else
+            {
+              fprintf (stderr, "error: size of the buffer is too small.\n");
+              return 0;
+            }
+        }
+
+      while (nbytes--)
+        {
+          if (addr < *size)
+            (*rom)[addr++] = getbyte (fin, &sum);
+        }
+
+      if (addr > *real_size)
+        *real_size = addr;
+
+      checksum = getbyte (fin, &sum);
+      if (0 != (sum & 0xff))
+        {
+          fprintf (stderr, "error: bad checksum: %02x.\n", checksum);
+          return 0;
+        }
+
+      while (isspace (sum = getc (fin)))  /* skip all kind of spaces */
+        ;
+      ungetc (sum, fin);
+    }
+  while (1 != record_type); /* EOF record */
+
+  return 1;
+}
+
+int
+main (int argc, char **argv)
+{
+  int size = 32768, skipsize = 0, pack = 0, real_size = 0, i = 0;
+  char *token;
+  BYTE *rom;
+  FILE *fin, *fout;
+  char *filename = NULL;
+  int ret;
+  int gb = 0;
+  int sms = 0;
+
+  struct gb_opt_s gb_opt = {.cart_name="",
+                            .licensee_str={'0', '0'},
+                            .mbc_type=0,
+                            .nb_rom_banks=2,
+                            .nb_ram_banks=0,
+                            .licensee_id=0x33,
+                            .is_gbc=0,
+                            .is_sgb=0,
+                            .sym_conversion=0,
+                            .non_jp=0,
+                            .rom_banks_autosize=0,
+                            .do_logo_copy=true,
+                            .address_overwrite={0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0} };
+
+  struct sms_opt_s sms_opt = {.rom_size=0xa,
+                              .region_code=7,
+                              .version=0 };
+
+#if defined(_WIN32)
+  setmode (fileno (stdout), O_BINARY);
+#endif
+
+  while (*++argv && '-' == argv[0][0] && '\0' != argv[0][1])
+    {
+      switch (argv[0][1])
+        {
+        case 's':
+          if (!*++argv)
+            {
+              usage ();
+              return 1;
+            }
+          size = strtoul (*argv, NULL, 0);
+          break;
+
+        case 't':
+          if (!*++argv)
+            {
+              usage ();
+              return 1;
+            }
+          skipsize = strtoul (*argv, NULL, 0);
+          break;
+
+        case 'h':
+          usage ();
+          return 0;
+
+        case 'p':
+          pack = 1;
+          break;
+
+        case 'Z':
+          /* generate GameBoy binary file */
+          gb = 1;
+          break;
+
+        case 'y':
+          /* GameBoy options:
+           * -yo  Number of rom banks (default: 2)
+           * -ya  Number of ram banks (default: 0)
+           * -yt  MBC type (default: no MBC)
+           * -yn  Name of program (default: name of output file)
+           */
+          switch (argv[0][2])
+            {
+            case 'o':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              // Use auto-size for rom banks if -yto size param is 'A'
+              if ((*argv)[0] == 'A' || (*argv)[0] == 'a')
+                  gb_opt.rom_banks_autosize = 1;
+              else
+                {
+                  gb_opt.nb_rom_banks = strtoul (*argv, NULL, 0);
+                  size = gb_opt.nb_rom_banks * 0x4000;
+                }
+              break;
+
+            case 'a':
+              if (!++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              gb_opt.nb_ram_banks = strtoul (*argv, NULL, 0);
+              break;
+
+            case 't':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              gb_opt.mbc_type = strtoul (*argv, NULL, 0);
+              break;
+
+            case 'n':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              strncpy (gb_opt.cart_name, *argv, CART_NAME_LEN-1);
+              gb_opt.cart_name[CART_NAME_LEN-1] = '\0';
+              break;
+
+            case 'k':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              strncpy (gb_opt.licensee_str, *argv, 2);
+              break;
+
+            case 'l':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              gb_opt.licensee_id = strtoul (*argv, NULL, 0);
+              break;
+
+            case 'c':
+              gb_opt.is_gbc = 1;
+              break;
+
+            case 'C':
+              gb_opt.is_gbc = 2;
+              break;
+
+            case 'N':
+              gb_opt.do_logo_copy = false; // when switch is present, turn off logo copy
+              break;
+
+            case 's':
+              gb_opt.is_sgb = 1;
+              break;
+
+            case 'S':
+              gb_opt.sym_conversion = 1;
+              break;
+
+            case 'j':
+              gb_opt.non_jp = 1;
+              break;
+
+            // like -yp0x143=0x80
+            case 'p':
+              // remove "-yp"
+              *argv += 3;
+              // effectively split string into argv and token
+              strtok(*argv, "=");
+              token = strtok(NULL, "=");
+              for (i = 0; i < 16; i+=2)
+                {
+                  if(gb_opt.address_overwrite[i] == 0xFF)
+                    {
+                      gb_opt.address_overwrite[i] = strtoul (*argv, NULL, 0);
+                      gb_opt.address_overwrite[i+1] = strtoul (token, NULL, 0);
+                      break;
+                    }
+                }
+              break;
+
+            default:
+              usage ();
+              return 1;
+            }
+          break;
+
+        case 'S':
+          /* generate SMS binary file */
+          sms = 1;
+          break;
+
+        case 'x':
+
+          switch (argv[0][2])
+            {
+            case 'o':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              sms_opt.rom_size = strtoul (*argv, NULL, 0);
+              if ( sms_opt.rom_size > 2 && (sms_opt.rom_size < 0xa || sms_opt.rom_size > 0xf ) )
+                {
+                  fprintf (stderr, "error: invalid rom size (0x%X)", sms_opt.rom_size);
+                  perror(NULL);
+                  return 1;
+                }
+              if ( sms_opt.rom_size == 0xd || sms_opt.rom_size == 0x2 )
+                {
+                  fprintf (stderr, "warning: this rom size (0x%X) is bugged in some BIOSes\n", sms_opt.rom_size);
+                }
+              break;
+
+            case 'j':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              sms_opt.region_code = strtoul (*argv, NULL, 0);
+              if ( sms_opt.region_code < 3 && sms_opt.region_code > 7 )
+                {
+                  fprintf (stderr, "error: invalid region code (0x%X)", sms_opt.region_code);
+                  perror(NULL);
+                  return 1;
+                }
+              break;
+
+            case 'v':
+              if (!*++argv)
+                {
+                  usage ();
+                  return 1;
+                }
+              sms_opt.version = strtoul (*argv, NULL, 0);
+              if ( sms_opt.version > 0xf )
+                {
+                  fprintf (stderr, "error: invalid version (0x%X)", sms_opt.version);
+                  perror(NULL);
+                  return 1;
+                }
+              break;
+
+            default:
+              usage ();
+              return 1;
+            }
+          break;
+
+        default:
+          usage ();
+          return 1;
+        }
+    }
+
+  fin = stdin;
+  fout = stdout;
+  if (*argv)
+    {
+      if ('-' != argv[0][0] || '\0' != argv[0][1])
+        {
+          if (NULL == (fin = fopen (*argv, "r")))
+            {
+              fprintf (stderr, "error: can't open %s: ", *argv);
+              perror(NULL);
+              return 1;
+            }
+          filename = *argv;
+        }
+      ++argv;
+    }
+
+  if (NULL != argv[0] && NULL != argv[1])
+    {
+      usage ();
+      return 1;
+    }
+
+  rom = malloc (size);
+  if (rom == NULL)
+    {
+      fclose (fin);
+      fprintf (stderr, "error: couldn't allocate room for the image.\n");
+      return 1;
+    }
+  memset (rom, FILL_BYTE, size);
+
+  if (gb_opt.sym_conversion == 1)
+    {
+      if (filename)
+        noi2sym(filename);
+      else
+        {
+          fprintf (stderr, "error: .noi to .sym conversion needs an input file.\n");
+        }
+    }
+
+  ret = read_ihx (fin, &rom, &size, &real_size, &gb_opt);
+
+  fclose (fin);
+
+  if (ret)
+    {
+      if (gb)
+        gb_postproc (rom, size, &real_size, &gb_opt);
+      else if (sms)
+        sms_postproc (rom, size, &real_size, &sms_opt);
+
+      if (*argv)
+        {
+          if ('-' != argv[0][0] || '\0' != argv[0][1])
+            {
+              if (NULL == (fout = fopen (*argv, "wb")))
+                {
+                  fprintf (stderr, "error: can't create %s: ", *argv);
+                  perror(NULL);
+                  return 1;
+                }
+            }
+        }
+
+      int writesize = (pack ? real_size : size) - skipsize;
+      if (writesize > 0) fwrite (rom + skipsize, 1, writesize, fout);
+
+      fclose (fout);
+
+      return 0;
+    }
+  else
+    return 1;
+}
+
diff --git a/gbdk/gbdk-support/makecom/Makefile b/gbdk/gbdk-support/makecom/Makefile
new file mode 100644
index 00000000..7e46e311
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/Makefile
@@ -0,0 +1,32 @@
+# makecom makefile
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+CC = $(TOOLSPREFIX)gcc
+CFLAGS = -ggdb -O -Wno-incompatible-pointer-types -DGBDKLIBDIR=\"$(TARGETDIR)\"
+OBJ = makecom.o noi_file.o files.o bin_to_com.o list.o path_ops.o
+BIN = makecom
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+
+clean:
+	rm -f *.o $(BIN) *~
+	rm -f tmp.*
+	rm -f *.exe
+
+
diff --git a/gbdk/gbdk-support/makecom/bin_to_com.c b/gbdk/gbdk-support/makecom/bin_to_com.c
new file mode 100644
index 00000000..dd3b7722
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/bin_to_com.c
@@ -0,0 +1,164 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "common.h"
+#include "list.h"
+#include "files.h"
+#include "noi_file.h"
+#include "bin_to_com.h"
+
+
+uint8_t * banks[BANKS_MAX_COUNT] = {NULL};
+uint16_t  banks_len[BANKS_MAX_COUNT] = {0};
+uint16_t  banks_count = 0;
+
+
+void banks_cleanup(void) {
+    for (int c = 0; c <= BANKS_MAX_ID; c++) {
+        if (banks[c] != NULL) {
+
+            free(banks[c]);
+            banks[c] = NULL;
+        }
+    }
+}
+
+
+// Allocate memory for banks as banks are requested
+// If preceding banks are not yet allocated then do those too
+uint8_t * bank_get_ptr(uint16_t bank_num) {
+
+    if (bank_num > BANKS_MAX_ID) {
+        printf("makecom: ERROR: Requested bank %d is larger than max bank num %d!\n", bank_num, BANKS_MAX_ID);
+        exit(EXIT_FAILURE);
+    }
+
+    if (banks[bank_num] == NULL) {
+
+        // Make sure all banks leading up to requested are also allocated
+        for (int c = 0; c <= bank_num; c++) {
+            if (banks[c] == NULL) {
+
+                banks[c] = malloc(BANK_SIZE);
+
+                if (!banks[c]) {
+                    printf("makecom: ERROR: Failed to allocate memory for bank %d!\n", c);
+                    exit(EXIT_FAILURE);
+                }
+
+                // zero out buffer (though unused space will not get written out)
+                memset(banks[c], 0x00u, BANK_SIZE);
+            }
+        }
+    }
+
+    return banks[bank_num];
+}
+
+
+
+// Copy data from source bin file at offset address into requested bank buffer
+void copy_to_bank(uint16_t bank_num, uint32_t rom_src_addr, uint32_t bank_out_addr, uint32_t length) {
+
+    // TODO: make sure bin src addr doesn't exceed source file buffer length
+    if ((rom_src_addr + length) > rom_buf_in_len) {
+        printf("makecom: ERROR: Can't copy %d bytes from %x for bank %d, would overflow past end of ROM source buffer of size %d!\n", length, rom_src_addr, bank_num, (uint32_t)rom_buf_in_len);
+        exit(EXIT_FAILURE);
+    }
+
+    if ((bank_out_addr + length) > BANK_SIZE) {
+        printf("makecom: ERROR: Can't copy %d bytes to %04x for bank %d, would overflow past end of bank buffer of size %d!\n",length, bank_out_addr, bank_num, BANK_SIZE);
+        exit(EXIT_FAILURE);
+    }
+
+    if (bank_num > banks_count)
+        banks_count = bank_num;
+
+    // Update length of bank data buffers (to allow for truncating output later)
+    if ((bank_out_addr + length) > banks_len[bank_num])
+        banks_len[bank_num] = (bank_out_addr + length);
+
+    // printf("* copying... bank:%d from:%x to:%x len:%d\n",
+    //         bank_num, rom_src_addr, bank_out_addr, length);
+
+    memcpy(bank_get_ptr(bank_num) + bank_out_addr, p_rom_buf_in + rom_src_addr, length);
+}
+
+
+void banks_write_out(void) {
+
+    // If any of below fails it will trigger exit() and cleanup() will be called
+
+    // Write first bank out, handled differently than rest
+    if ((banks[0] != NULL) && (banks_len[0] > 0)) {
+        // printf("Bank %d: Writing %d bytes to %s\n",0, banks_len[0], filename_out_com);
+        file_write_from_buffer(filename_out_com, banks[0], banks_len[0]);
+    } else {
+        printf("makecom: Error: Bank 0 was empty, no data written\n");
+        exit;
+    }
+
+    // Write out remaining banks if applicable
+    char bank_fname[MAX_STR_LEN] = "";
+    for (int c = 1; c <= BANKS_MAX_ID; c++) {
+        if ((banks[c] != NULL) && (banks_len[0] > 0)) {
+            // Format to 8.3 filename with bank num as zero padded extension
+            sprintf(bank_fname, "%s.%03d", filename_banks_base, c);
+            // printf("Bank %d: Writing %d bytes to %s\n",c, banks_len[c], bank_fname);
+            file_write_from_buffer(bank_fname, banks[c], banks_len[c]);
+        } else
+            break; // Exit loop on first unpopulated bank
+    }
+
+}
+
+
+
+int bin2com(void) {
+
+    symbol_item * symbols = (symbol_item *)symbol_list.p_array;
+
+    for(int c = 0; c < symbol_list.count; c++) {
+
+        // Only process completed symbols (start and length both set, lenth not zero)
+        if ((symbols[c].addr_start != SYM_VAL_UNSET) &&
+            (symbols[c].length != SYM_VAL_UNSET) &&
+            (symbols[c].length > 0)) {
+
+            // If symbol is for a bank > 0
+            if ((strncmp(symbols[c].name, "_CODE_", (sizeof("_CODE_") - 1)) == 0) && (symbols[c].bank_num > 0)) {
+                // Copy data from bank addr in source ROM to start of separate bank buffer
+                copy_to_bank(symbols[c].bank_num, symbols[c].src_rom_addr, BANK_START_ADDR, symbols[c].length);
+            } else {
+                // For remaining symbols (assume bank 0), relocate them by -100 when possible (addr -> addr - 100)
+                copy_to_bank(BANK_0, symbols[c].addr_start, BANK_0_RELOC_ADDR(symbols[c].addr_start), symbols[c].length);
+            }
+        }
+    }
+
+    // Patch in updated bank / overlay count and bank filename
+    if ((banks_count > 0) && (overlay_count_addr != SYM_VAL_UNSET) && (overlay_name_addr != SYM_VAL_UNSET)) {
+
+        if (overlay_count_addr > BANK_0_ADDR_OFFSET)
+            *(banks[0] + (overlay_count_addr - BANK_0_ADDR_OFFSET)) = banks_count;
+
+        if (overlay_name_addr > BANK_0_ADDR_OFFSET)
+            memcpy(banks[0] + (overlay_name_addr - BANK_0_ADDR_OFFSET), filename_overlay, COM_OVERLAY_NAME_LEN-1);
+    }
+
+    // No write the data out
+    banks_write_out();
+
+    return EXIT_SUCCESS;
+}
+
+
+
diff --git a/gbdk/gbdk-support/makecom/bin_to_com.h b/gbdk/gbdk-support/makecom/bin_to_com.h
new file mode 100644
index 00000000..79d38c2b
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/bin_to_com.h
@@ -0,0 +1,31 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _BIN_TO_COM_H
+#define _BIN_TO_COM_H
+
+#define MAX(a, b)            ((a > b) ? a : b)
+#define BANKS_MAX_COUNT  256
+#define BANKS_MAX_ID     (BANKS_MAX_COUNT - 1)
+#define BANK_SIZE        (0x4000u)
+#define BANK_START_ADDR  (0x0000u)
+#define BANK_0           0
+#define BANK_0_ADDR_OFFSET 0x100
+
+#define BANK_GET_NUM(addr)   ((addr & 0xFFFF0000U) >> 16)
+#define WITHOUT_BANK(addr)   (addr & 0x0000FFFFU)
+// Converts a symbol bank address such as 0x34000 to a bin/rom address such as 0x12000 (i.e: ~0x4000 * 3)
+// Make sure base bank addess doesn't go negative
+#define BANK_GET_ROM_ADDR(addr) ( (MAX(WITHOUT_BANK(addr), BANK_SIZE) - BANK_SIZE) + (BANK_SIZE * BANK_GET_NUM(addr)) )
+
+// Apply bank 0 address offset and make sure it doesn't go negative
+#define BANK_0_RELOC_ADDR(addr)   (MAX((addr), BANK_0_ADDR_OFFSET) - BANK_0_ADDR_OFFSET)
+
+void copy_data(uint16_t bank_num, uint32_t rom_src_addr, uint32_t bank_out_addr, uint32_t length);
+uint8_t * bank_get_ptr(uint16_t bank_num);
+void copy_to_bank(uint16_t bank_num, uint32_t rom_src_addr, uint32_t bank_out_addr, uint32_t length);
+void banks_cleanup(void);
+int bin2com(void);
+
+#endif // _BIN_TO_COM_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/makecom/common.h b/gbdk/gbdk-support/makecom/common.h
new file mode 100644
index 00000000..b38600aa
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/common.h
@@ -0,0 +1,25 @@
+#ifndef _COMMON_H
+#define _COMMON_H
+
+#include <stdint.h>
+
+#define ARRAY_LEN(A)  (sizeof(A) / sizeof(A[0]))
+
+#define MAX_STR_LEN     4096
+#define MAX_FILE_STR    (MAX_STR_LEN)
+#define SYM_MAX_STR_LEN 1024
+
+#define BANK_FNAME_LEN  (8+1+3 +1) // 8.3 filename style + terminator, ex: MYCOMFIL.001 (from "mycomfile.com")
+#define COM_OVERLAY_NAME_LEN (8 + 1) // 8 chars for overlay string + terminator "MYCOMFIL"
+
+
+extern char filename_in_bin[];
+extern char filename_in_noi[];
+extern char filename_out_com[];
+extern char filename_banks_base[];
+extern char filename_overlay[];
+
+extern uint8_t * p_rom_buf_in;
+extern size_t    rom_buf_in_len;
+
+#endif // _COMMON_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/makecom/files.c b/gbdk/gbdk-support/makecom/files.c
new file mode 100644
index 00000000..c6f78e9d
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/files.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+
+
+// Read from a file into a buffer (will allocate needed memory)
+// Returns NULL if reading file didn't succeed
+uint8_t * file_read_into_buffer(char * filename, uint32_t *ret_size) {
+
+    long fsize;
+    FILE * file_in = fopen(filename, "rb");
+    uint8_t * filedata = NULL;
+
+    if (file_in) {
+        // Get file size
+        fseek(file_in, 0, SEEK_END);
+        fsize = ftell(file_in);
+        if (fsize != -1L) {
+            fseek(file_in, 0, SEEK_SET);
+
+            filedata = malloc(fsize);
+            if (filedata) {
+                if (fsize != fread(filedata, 1, fsize, file_in)) {
+                    printf("makecom: Warning: File read size didn't match expected for %s\n", filename);
+                    filedata = NULL;
+                }
+                // Read was successful, set return size
+                *ret_size = fsize;
+            } else printf("makecom: ERROR: Failed to allocate memory to read file %s\n", filename);
+
+        } else printf("makecom: ERROR: Failed to read size of file %s\n", filename);
+
+        fclose(file_in);
+    } else printf("makecom: ERROR: Failed to open input file %s\n", filename);
+
+    return filedata;
+}
+
+
+
+// Writes a buffer to a file
+bool file_write_from_buffer(char * filename, uint8_t * p_buf, uint32_t data_len) {
+
+    bool status = false;
+    size_t wrote_bytes;
+    FILE * file_out = fopen(filename, "wb");
+    if (file_out) {
+        if (data_len == fwrite(p_buf, 1, data_len, file_out))
+            status = true;
+        else
+            printf("makecom: Warning: File write size didn't match expected for %s\n", filename);
+
+        fclose(file_out);
+    } else {
+        printf("makecom: ERROR: Failed to open output file %s!\n",filename);
+        exit(EXIT_FAILURE);
+    }
+
+    return status;
+}
diff --git a/gbdk/gbdk-support/makecom/files.h b/gbdk/gbdk-support/makecom/files.h
new file mode 100644
index 00000000..c027b173
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/files.h
@@ -0,0 +1,7 @@
+#ifndef _FILES_H
+#define _FILES_H
+
+uint8_t * file_read_into_buffer(char * filename, uint32_t *ret_size);
+bool file_write_from_buffer(char * filename, uint8_t * p_buf, uint32_t data_len);
+
+#endif // _FILES_H
diff --git a/gbdk/gbdk-support/makecom/list.c b/gbdk/gbdk-support/makecom/list.c
new file mode 100644
index 00000000..868bee3a
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/list.c
@@ -0,0 +1,70 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "common.h"
+#include "list.h"
+
+#define LIST_GROW_SIZE 100 // 50 // grow array by N entries at a time
+
+// Initialize the list and it's array
+// typesize *must* match the type that will be used with the array
+void list_init(list_type * p_list, size_t array_typesize) {
+    p_list->typesize = array_typesize;
+    p_list->count   = 0;
+    p_list->size    = LIST_GROW_SIZE;
+    p_list->p_array = (void *)malloc(p_list->size * p_list->typesize);
+
+    if (!p_list->p_array) {
+        printf("makecom: ERROR: Failed to allocate memory for list!\n");
+        exit(EXIT_FAILURE);
+    }
+}
+
+
+// Free the array memory allocated for the list
+void list_cleanup(list_type * p_list) {
+    if (p_list->p_array) {
+        free (p_list->p_array);
+        p_list->p_array = NULL;
+    }
+}
+
+
+// Add a new item to the lists array, resize if needed
+// p_newitem *must* be the same type the list was initialized with
+void list_additem(list_type * p_list, void * p_newitem) {
+
+    void * tmp_list;
+
+    p_list->count++;
+
+    // Grow array if needed
+    if (p_list->count == p_list->size) {
+        // Save a copy in case reallocation fails
+        tmp_list = p_list->p_array;
+
+        p_list->size += p_list->typesize * LIST_GROW_SIZE;
+        p_list->p_array = (void *)realloc(p_list->p_array, p_list->size * p_list->typesize);
+        // If realloc failed, free original buffer before quitting
+        if (!p_list->p_array) {
+            printf("makecom: ERROR: Failed to reallocate memory for list!\n");
+            if (tmp_list) {
+                free(tmp_list);
+                tmp_list = NULL;
+            }
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    // Copy new entry
+    memcpy((uint_least8_t *)p_list->p_array + ((p_list->count - 1) * p_list->typesize),
+           p_newitem,
+           p_list->typesize);
+}
+
diff --git a/gbdk/gbdk-support/makecom/list.h b/gbdk/gbdk-support/makecom/list.h
new file mode 100644
index 00000000..ef9d3d52
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/list.h
@@ -0,0 +1,20 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _LIST_H
+#define _LIST_H
+
+
+typedef struct list_type {
+    void *   p_array;
+    uint32_t size;
+    uint32_t count;
+    size_t   typesize;
+} list_type;
+
+void list_init(list_type *, size_t);
+void list_cleanup(list_type *);
+void list_additem(list_type *, void *);
+
+#endif // _LIST_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/makecom/makecom.c b/gbdk/gbdk-support/makecom/makecom.c
new file mode 100644
index 00000000..a6abd51d
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/makecom.c
@@ -0,0 +1,147 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2022
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include "path_ops.h"
+#include "common.h"
+#include "files.h"
+#include "noi_file.h"
+#include "bin_to_com.h"
+
+#define EXT_NOI "noi"
+
+char filename_in_bin[MAX_STR_LEN] = "";
+char filename_in_noi[MAX_STR_LEN] = "";
+char filename_out_com[MAX_STR_LEN] = "";
+char filename_banks_base[MAX_STR_LEN] = "";
+char filename_overlay[COM_OVERLAY_NAME_LEN] = "";
+
+uint8_t * p_rom_buf_in  = NULL;
+size_t    rom_buf_in_len = 0;
+
+static void str_to_upper(char * str);
+static void filenames_out_prepare(void);
+static void display_help(void);
+static int handle_args(int argc, char * argv[]);
+void cleanup(void);
+
+
+static void str_to_upper(char * str) {
+    while (*str) {
+        *str = toupper(*str);
+        str++;
+    }
+}
+
+
+
+// Generate names for the exported bank/overlay files
+// based on the output COM filename and path
+static void filenames_out_prepare(void) {
+
+    char str_banks_name[MAX_STR_LEN];
+    char str_path_only[MAX_STR_LEN];
+
+    snprintf(str_banks_name,  sizeof(str_banks_name), "%s", filename_out_com);
+
+    if (!get_path_without_filename(filename_out_com, str_path_only, sizeof(str_path_only))) {
+        printf("makecom: Error: source path %s exceeds max length\n", filename_out_com);
+        exit;
+    }
+
+    // Convert filename to uppercase and remove extension
+    str_to_upper(str_banks_name);
+    filename_remove_extension(str_banks_name);
+
+    // Then truncate it to 8 characters with no padding for bank filenames
+    int ret = snprintf(filename_banks_base, sizeof(filename_banks_base), "%s%.8s", str_path_only, get_filename_from_path(str_banks_name));
+    if (ret < 0) printf("makecom: Warning, banks output path truncated\n");
+    // Then with trailing space char padding for the overlay filename patch
+    snprintf(filename_overlay, sizeof(filename_overlay), "%-8.8s", get_filename_from_path(str_banks_name));
+}
+
+
+static void display_help(void) {
+
+    fprintf(stdout,
+       "makecom image.rom image.noi output.com\n"
+       "Use: convert a binary .rom file to .msxdos com format.\n"
+       );
+}
+
+
+int handle_args(int argc, char * argv[]) {
+
+    if (argc == 3) {
+        // Copy input and output filenames from arguments
+        snprintf(filename_in_bin,  sizeof(filename_in_bin),  "%s", argv[1]);
+        snprintf(filename_out_com, sizeof(filename_out_com), "%s", argv[2]);
+        // Generate .noi file name from input .bin file name
+        snprintf(filename_in_noi,  sizeof(filename_in_noi),  "%s", argv[1]);
+        filename_replace_extension(filename_in_noi, EXT_NOI, MAX_STR_LEN);
+    } else if (argc == 4) {
+        // Copy input and output filenames from arguments
+        snprintf(filename_in_bin,  sizeof(filename_in_bin),  "%s", argv[1]);
+        snprintf(filename_in_noi,  sizeof(filename_in_noi),  "%s", argv[2]);
+        snprintf(filename_out_com, sizeof(filename_out_com), "%s", argv[3]);
+    } else {
+        display_help();
+        return false;
+    }
+
+    filenames_out_prepare();
+
+
+    // printf("bin: %s\n",filename_in_bin);
+    // printf("noi: %s\n",filename_in_noi);
+    // printf("com: %s\n",filename_out_com);
+
+    // printf("banks base: _%s_\n",filename_banks_base);
+    // printf("overlay   : _%s_\n",filename_overlay);
+
+
+    return true;
+}
+
+
+// Registered as atexit() handler
+// Free resources during normal shutdown or from a call to exit()
+void cleanup(void) {
+
+    banks_cleanup();
+    noi_cleanup();
+
+    if (p_rom_buf_in != NULL) {
+        free(p_rom_buf_in);
+        p_rom_buf_in = NULL;
+    }
+}
+
+
+int main( int argc, char *argv[] )  {
+
+    // Exit with failure by default
+    int ret = EXIT_FAILURE;
+
+    // Register cleanup with exit handler
+    atexit(cleanup);
+
+    if (handle_args(argc, argv)) {
+
+        p_rom_buf_in = file_read_into_buffer(filename_in_bin, &rom_buf_in_len);
+
+        if (p_rom_buf_in)
+            if (noi_file_load_symbols(filename_in_noi))
+                ret = bin2com();
+    }
+    cleanup();
+
+    return ret; // Exit with failure by default
+}
diff --git a/gbdk/gbdk-support/makecom/noi_file.c b/gbdk/gbdk-support/makecom/noi_file.c
new file mode 100644
index 00000000..f2fc935d
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/noi_file.c
@@ -0,0 +1,164 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "common.h"
+#include "noi_file.h"
+#include "bin_to_com.h"
+
+// Example data to parse from a .noi file:
+/*
+DEF s__CODE 0x200
+DEF l__BASE 0x2A3
+DEF __shadow_OAM_OFF 0x455
+DEF .mode 0x456
+*/
+
+const char * known_section_names[] =
+        {"_CODE","_HOME","_BASE","_CODE_0","_INITIALIZER","_LIT","_GSINIT","_GSFINAL"};
+
+
+list_type symbol_list;
+uint32_t overlay_count_addr = SYM_VAL_UNSET;
+uint32_t overlay_name_addr = SYM_VAL_UNSET;
+
+
+// Initialize the symbol list
+void noi_init(void) {
+
+    list_init(&symbol_list, sizeof(symbol_item));
+}
+
+
+// Free the symbol list
+void noi_cleanup(void) {
+
+    list_cleanup(&symbol_list);
+}
+
+
+// Find a matching symbol, if none matches a new one is added and returned
+static int symbollist_get_id_by_name(char * symbol_name) {
+
+    symbol_item * symbols = (symbol_item *)symbol_list.p_array;
+
+    // Check for matching symbol name
+    for(int c = 0;c < symbol_list.count; c++) {
+        // Return matching symbol index if present
+        if (strcmp(symbol_name, symbols[c].name) == 0) {
+            return c;
+        }
+    }
+
+    // no match was found, add symbol
+    symbol_item new_symbol = {.name = "", .addr_start = SYM_VAL_UNSET, .length = SYM_VAL_UNSET, .bank_num = 0x00, .src_rom_addr = SYM_VAL_UNSET};
+    snprintf(new_symbol.name, sizeof(new_symbol.name), "%s", symbol_name);
+    list_additem(&symbol_list, &new_symbol);
+
+    return (symbol_list.count - 1);
+}
+
+
+// Add the start address or length for a s_ or l_ symbol record
+static void noi_symbollist_add(char rec_type, char * name, char * value) {
+
+    // Only add symbols if they're in the known section name list
+    for (int c = 0; c < ARRAY_LEN(known_section_names); c++) {
+
+        if ((strcmp(name, known_section_names[c]) == 0) ||
+            (strncmp(name, "_CODE_", (sizeof("_CODE_") - 1)) == 0)) {
+
+            symbol_item * symbols = (symbol_item *)symbol_list.p_array;
+
+            // Check to see if there is an existing record to update
+            // If one isn't found a new record will have been created automatically
+            int symbol_id = symbollist_get_id_by_name(name);
+            if (symbol_id != ERR_NO_SYMBOLS_LEFT) {
+
+                // Handle whether it's a start-of-address or a length record for the given symbol
+                if (rec_type == NOI_REC_START) {
+                    symbols[symbol_id].addr_start   = strtol(value, NULL, 16);
+                    symbols[symbol_id].bank_num     = BANK_GET_NUM(symbols[symbol_id].addr_start);
+                    symbols[symbol_id].src_rom_addr = BANK_GET_ROM_ADDR(symbols[symbol_id].addr_start);
+                }
+                else if (rec_type == NOI_REC_LENGTH) {
+                    symbols[symbol_id].length = strtol(value, NULL, 16);
+                }
+            }
+
+            return;
+        }
+    }
+}
+
+
+// Load symbols from a .noi file and create paired records for start & length entries
+// Plus, look for and store for overlay symbol information
+int noi_file_load_symbols(char * filename_in) {
+
+    char cols;
+    char * p_str;
+    char * p_words[MAX_SPLIT_WORDS];
+    char strline_in[MAX_STR_LEN] = "";
+    FILE * noi_file = fopen(filename_in, "r");
+    symbol_item symbol;
+    int symbol_id;
+
+    noi_init();
+
+    if (noi_file) {
+
+        // Read one line at a time into \0 terminated string
+        while ( fgets(strline_in, sizeof(strline_in), noi_file) != NULL) {
+
+            // Require minimum length to match
+            if (strlen(strline_in) >= NOI_REC_START_LEN) {
+
+                // Split string into words separated by spaces
+                cols = 0;
+                p_str = strtok(strline_in," ");
+                while (p_str != NULL)
+                {
+                    p_words[cols++] = p_str;
+                    // Only split on underscore for the second match
+                    p_str = strtok(NULL, " ");
+                    if (cols >= MAX_SPLIT_WORDS) break;
+                }
+
+                // [0] = "DEF"
+                // [1] = symbol name
+                // [2] = symbol value
+                if (cols >= NOI_REC_COUNT_MATCH) {
+
+                    // If it matches either _s_egment or _l_ength records (first two chars)
+                    // then add a record for it with the first two chars truncated
+                    if ((strncmp(p_words[1], "l_", NOI_REC_S_L_CHK) == 0) ||
+                        (strncmp(p_words[1], "s_", NOI_REC_S_L_CHK) == 0)) {
+                        noi_symbollist_add(p_words[1][0], p_words[1] + NOI_REC_S_L_CHK, p_words[2]);
+                    }
+                    // Otherwise check for records of interest and store them
+                    else if (strcmp(p_words[1], "___overlay_count") == 0) {
+                        overlay_count_addr = strtol(p_words[2], NULL, 16);
+                    }
+                    else if (strcmp(p_words[1], "___overlay_name") == 0) {
+                        overlay_name_addr = strtol(p_words[2], NULL, 16);
+                    }
+                }
+            } // end: valid min chars to process line
+
+        } // end: while still lines to process
+
+        fclose(noi_file);
+
+    } // end: if valid file
+    else return (false);
+
+   return true;
+}
diff --git a/gbdk/gbdk-support/makecom/noi_file.h b/gbdk/gbdk-support/makecom/noi_file.h
new file mode 100644
index 00000000..b6d873b7
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/noi_file.h
@@ -0,0 +1,40 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _NOI_FILE_H
+#define _NOI_FILE_H
+
+#include "list.h"
+
+#define MAX_STR_LEN     4096
+#define MAX_SPLIT_WORDS 4
+
+#define NOI_REC_COUNT_MATCH 3 // "DEF ...symbol_name... ...symbol_value...
+
+#define ERR_NO_SYMBOLS_LEFT -1
+#define SYM_VAL_UNSET   0xFFFFFFFF
+
+#define NOI_REC_START_LEN 4 // length of "DEF "
+#define NOI_REC_S_L_CHK   2 // length of "s_" or "l_"
+#define NOI_REC_START   's'
+#define NOI_REC_LENGTH  'l'
+
+typedef struct symbol_item {
+    char     name[SYM_MAX_STR_LEN];
+    uint32_t addr_start;
+    uint32_t length;
+    uint16_t bank_num;
+    uint32_t src_rom_addr;
+} symbol_item;
+
+extern list_type symbol_list;
+extern uint32_t overlay_count_addr;
+extern uint32_t overlay_name_addr;
+
+
+int noi_file_load_symbols(char * filename_in);
+void noi_init(void);
+void noi_cleanup(void);
+
+#endif // _NOI_FILE_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/makecom/pascal/Makefile b/gbdk/gbdk-support/makecom/pascal/Makefile
new file mode 100644
index 00000000..5a1d29ed
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/pascal/Makefile
@@ -0,0 +1,31 @@
+# bankcheck (auto bank tool) makefile
+
+ifndef TARGETDIR
+TARGETDIR = /opt/gbdk
+endif
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+CC =
+CFLAGS = 
+OBJ = 
+BIN = makecom
+
+all: $(BIN)
+
+$(BIN): makecom.dpr
+	fpc -B $< 
+
+clean:
+	rm -f *.o $(BIN) *~ *.dof *.cfg *.dsk
+	rm -f *.exe
+
diff --git a/gbdk/gbdk-support/makecom/pascal/makecom.dpr b/gbdk/gbdk-support/makecom/pascal/makecom.dpr
new file mode 100644
index 00000000..c2164095
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/pascal/makecom.dpr
@@ -0,0 +1,184 @@
+{$APPTYPE CONSOLE}
+{$IFDEF FPC}
+  {$MODE DELPHI}
+{$ENDIF}
+uses classes, sysutils, math;
+
+procedure ERROR(const msg: ansistring; const params: array of const);
+begin
+  writeln(format(msg, params));
+  writeln('USAGE: makecom <image.bin> [<image.noi>] <output.com>');
+  halt(1);
+end;
+
+procedure DecodeCommaText(const Value: ansistring; result: tStringList; adelimiter: ansichar);
+var P, P1 : PAnsiChar;
+    S     : ansistring;
+begin
+  if assigned(result) then begin
+    result.BeginUpdate;
+    try
+      result.Clear;
+      P := PChar(Value);
+      while P^ in [#1..#31] do inc(P);
+      while P^ <> #0 do
+      begin
+        if P^ = '"' then
+          S := AnsiExtractQuotedStr(P, '"')
+        else
+        begin
+          P1 := P;
+          while (P^ >= ' ') and (P^ <> adelimiter) do inc(P);
+          SetString(S, P1, P - P1);
+        end;
+        result.Add(S);
+        while P^ in [#1..#31] do inc(P);
+        if P^ = adelimiter then
+          repeat
+            inc(P);
+          until not (P^ in [#1..#31]);
+      end;
+    finally
+      result.EndUpdate;
+    end;
+  end;
+end;
+
+function load_symbols(const filename: ansistring; symbols: tStringList): boolean;
+var s   : textfile;
+    str : ansistring;
+    row : tStringList;
+begin
+  result:= assigned(symbols);
+  if result then begin
+    assignfile(s, filename); reset(s);
+    try
+      row := tStringList.create;
+      try
+        while not eof(s) do begin
+          readln(s, str);
+          DecodeCommaText(str, row, ' ');
+          if (row[0] = 'DEF') then begin
+            symbols.Values[row[1]] := row[2];
+          end;
+        end;
+        result:= true;
+      finally freeandnil(row); end;
+    finally closefile(s); end;
+  end;
+end;
+
+function CopyData(banks: tList; bank: longint; image: tMemoryStream; source_ofs, dest_ofs: longint; len: longint): boolean;
+var i    : longint;
+    data : tMemoryStream;
+begin
+  result:= (bank < 255);
+  if result then begin
+    if (banks.count <= bank) then
+      for i:= banks.count to bank do banks.Add(tMemoryStream.Create());
+    data:= banks[bank];
+    data.Seek(dest_ofs, soFromBeginning);
+    data.Write(pAnsiChar(image.Memory)[source_ofs], len);
+  end;
+end;
+procedure WriteData(banks: tList; const destname: ansistring);
+var i   : longint;
+    ovr : ansistring;
+begin
+  if (banks.count > 0) then begin
+    with tMemoryStream(banks[0]) do try
+      writeln(format('writing program: %s', [destname]));
+      SaveToFile(destname);
+    finally free; end;
+    for i:= 1 to banks.count - 1 do
+      with tMemoryStream(banks[i]) do try
+        ovr:= ChangeFileExt(destname, format('.%.3d', [i]));
+        writeln(format('writing overlay: %s', [ovr]));
+        SaveToFile(ovr);
+      finally free; end;
+  end;
+end;
+
+function Hex2Int(value: ansistring): longint;
+begin
+  if (copy(value, 1, 2)) = '0x' then begin value[1]:= ' '; value[2]:= '$'; end;
+  result:= StrToIntDef(value, 0);
+end;
+
+const section_names = '_CODE,_HOME,_BASE,_CODE_0,_INITIALIZER,_LIT,_GSINIT,_GSFINAL';
+var   name_bin   : ansistring;
+      name_noi   : ansistring;
+      name_out   : ansistring;
+      symbols    : tStringList;
+      known      : tStringList;
+      banks      : tList;
+      source     : tMemoryStream;
+      i, bank    : longint;
+      name, v, l : ansistring;
+      addr, len  : longint;
+begin
+  if (paramcount() = 2) then begin
+    name_bin:= paramstr(1); name_noi:= changefileext(name_bin, '.noi'); name_out:= paramstr(2);
+  end else begin
+    if (paramcount() < 3) then ERROR('ERROR: Not sufficient parameters', []);
+    name_bin:= paramstr(1); name_noi:= paramstr(2); name_out:= paramstr(3);
+  end;
+
+  if not fileexists(name_noi) then ERROR('ERROR: symbol file: "%s" not found', [name_noi]);
+  if not fileexists(name_bin) then ERROR('ERROR: binary image: "%s" not found', [name_bin]);
+
+  known:= tStringList.create;
+  symbols := tStringList.create;
+  try
+    DecodeCommaText(section_names, known, ',');
+    if load_symbols(name_noi, symbols) then begin
+      source:= tMemoryStream.Create;
+      try
+        source.LoadFromFile(name_bin);
+        banks:= tList.Create;
+        with banks do try
+          for i:= 0 to symbols.count - 1 do begin
+            name:= symbols.Names[i];
+            v:= symbols.Values[name];
+            if (copy(name, 1, 2) = 's_') then begin
+              name:= copy(name, 3, length(name));
+              l:= symbols.Values[format('l_%s',[name])];
+              if length(l) > 0 then begin
+                addr:= Hex2Int(v);
+                len:= Hex2Int(l);
+
+                if (len > 0) then begin
+                  if (known.IndexOf(name) >= 0) then begin
+                    CopyData(banks, 0, source, addr, math.max(0, addr - $100), len);
+                  end;
+                  if (copy(Name, 1, 6) = '_CODE_') then begin
+                    bank:= addr shr 16;
+                    CopyData(banks, bank, source, math.max(0, (addr and $ffff) - $4000) + $4000 * bank, 0, len);
+                  end;
+                end;
+              end;
+            end;
+          end;
+
+          if (banks.Count > 0) then begin
+            addr:= Hex2Int(symbols.Values['___overlay_count']);
+            if (addr > $100) then pAnsiChar(tMemoryStream(banks[0]).Memory)[addr - $100]:= chr(banks.Count - 1);
+            addr:= Hex2Int(symbols.Values['___overlay_name']);
+            if (addr > $100) then begin
+              name:= format('%-8.8s', [uppercase(changefileext(extractfilename(name_out), ''))]);
+              system.move(name[1], pAnsiChar(tMemoryStream(banks[0]).Memory)[addr - $100], 8);
+            end;
+          end;
+
+          writeln('writing...');
+          WriteData(banks, name_out);
+          writeln('done!');
+        finally banks.free; end;
+      finally freeandnil(source); end;
+    end;
+  finally
+    freeandnil(symbols);
+    freeandnil(known);
+  end;
+
+end.
\ No newline at end of file
diff --git a/gbdk/gbdk-support/makecom/path_ops.c b/gbdk/gbdk-support/makecom/path_ops.c
new file mode 100644
index 00000000..974a4870
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/path_ops.c
@@ -0,0 +1,145 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#include "common.h"
+#include "path_ops.h"
+
+const char kExtensionSeparator = '.';
+const char kPathSeparator =
+
+#ifdef _WIN32
+  #ifndef _WIN32
+     #define __WIN32__
+  #endif
+#endif
+
+#ifdef __WIN32__
+                            '\\';
+#else
+                            '/';
+#endif
+
+const char kPathSeparator_unix = '/';
+
+
+void filename_replace_extension(char * filename, char * new_ext, size_t maxlen) {
+
+    // Use a temp work string in case out and in filename are the same pointer
+    char temp[MAX_FILE_STR];
+    char ext_sep[2] = {'\0'}; // default to empty string
+
+    // Add leading . to path if needed
+    if (new_ext[0] != kExtensionSeparator) {
+        ext_sep[0] = kExtensionSeparator;
+        ext_sep[1] = '\0';
+    }
+
+    // Strip extension from filename, append new extension
+    filename_remove_extension(filename);
+    snprintf(temp, maxlen, "%s%s%s", filename, ext_sep, new_ext);
+    snprintf(filename, maxlen, "%s", temp);
+}
+
+
+void filename_replace_path(char * filename, char * new_path, size_t maxlen) {
+
+    // Use a temp work string in case out and in filename are the same pointer
+    char temp[MAX_FILE_STR];
+    char path_sep[2] = {'\0'}; // default to empty string
+
+    // Add trailing slash to path if needed (Windows needs both for when running under linix like env)
+#ifdef __WIN32__
+    if (((new_path[(strlen(new_path)-1)] != kPathSeparator)) &&
+       ((new_path[(strlen(new_path)-1)] != kPathSeparator_unix)))
+#else
+    if ((new_path[(strlen(new_path)-1)] != kPathSeparator))
+#endif
+    {
+        path_sep[0] = kPathSeparator;
+        path_sep[1] = '\0';
+    }
+
+    // Strip path from path+filename, pre-pend new path
+    snprintf(temp, maxlen, "%s%s%s", new_path, path_sep, get_filename_from_path(filename));
+    snprintf(filename, maxlen, "%s", temp);
+}
+
+
+const char * get_filename_from_path(const char * path)
+{
+    size_t i;
+
+    // Returns string starting at last occurrance of path separator char
+    for(i = strlen(path) - 1; i; i--) {
+
+    // Add trailing slash to path if needed (Windows needs both for when running under linix like env)
+    #ifdef __WIN32__
+        if ((path[i] == kPathSeparator) || (path[i] == kPathSeparator_unix))
+    #else
+        if (path[i] == kPathSeparator)
+    #endif
+        {
+            return &path[i+1];
+        }
+    }
+    return path;
+}
+
+
+void filename_remove_extension(char * path)
+{
+    char * last_ext;
+    char * last_slash;
+
+    // Find the last path separator if present
+    // Starting from here ensures that no path ".." characters
+    // get mistaken as extension delimiters.
+    last_slash = strrchr (path, kExtensionSeparator);
+    if (!last_slash)
+        last_slash = path;
+
+    // Then check to see if there is an extension (starting with the last occurance of '.')
+    // (tries to remove *all* trailing extensions backward until the last slash)
+    last_ext = strrchr (last_slash, kExtensionSeparator);
+    while (last_ext) {
+        if (last_ext != NULL) {
+            // If an extension is found then overwrite it with a string terminator
+            *last_ext = '\0';
+        }
+        last_ext = strrchr (last_slash, kExtensionSeparator);
+    }
+}
+
+
+bool get_path_without_filename(const char * path, char * path_only, uint32_t str_max)
+{
+    size_t i;
+
+   if (strlen(path) + 1 > str_max)
+        return false;
+
+   for(i = strlen(path) - 1; i; i--) {
+
+    // Add trailing slash to path if needed (Windows needs both for when running under linix like env)
+    #ifdef __WIN32__
+        if ((path[i] == kPathSeparator) || (path[i] == kPathSeparator_unix))
+    #else
+        if (path[i] == kPathSeparator)
+    #endif
+        {
+            memcpy(path_only, path, i+1 );
+            path_only[i+1] = '\0';
+            return true;
+        }
+    }
+
+    // memcpy(path_only, path, strlen(path));
+    // No separater found, so no path
+    path_only[0] = '\0';
+    return true;
+}
+
diff --git a/gbdk/gbdk-support/makecom/path_ops.h b/gbdk/gbdk-support/makecom/path_ops.h
new file mode 100644
index 00000000..2ae8e3a0
--- /dev/null
+++ b/gbdk/gbdk-support/makecom/path_ops.h
@@ -0,0 +1,15 @@
+// This is free and unencumbered software released into the public domain.
+// For more information, please refer to <https://unlicense.org>
+// bbbbbr 2020
+
+#ifndef _PATH_OPS_H
+#define _PATH_OPS_H
+
+void filename_replace_extension(char * filename, char * new_ext, size_t maxlen);
+void filename_replace_path(char * filename, char * new_path, size_t maxlen);
+const char * get_filename_from_path(const char * path);
+void filename_remove_extension(char * path);
+bool get_path_without_filename(const char * path, char * path_only, uint32_t str_max);
+
+
+#endif // _PATH_OPS_H
\ No newline at end of file
diff --git a/gbdk/gbdk-support/png2asset/.gitignore b/gbdk/gbdk-support/png2asset/.gitignore
new file mode 100644
index 00000000..34c8dee4
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/.gitignore
@@ -0,0 +1,388 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_h.h
+*.ilk
+*.meta
+*.obj
+*.iobj
+*.pch
+*.pdb
+*.ipdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*_wpftmp.csproj
+*.log
+*.tlog
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Coverlet is a free, cross platform Code Coverage Tool
+coverage*.json
+coverage*.xml
+coverage*.info
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Nuget personal access tokens and Credentials
+nuget.config
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+*.appxbundle
+*.appxupload
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!?*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+ServiceFabricBackup/
+*.rptproj.bak
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+*.rptproj.rsuser
+*- [Bb]ackup.rdl
+*- [Bb]ackup ([0-9]).rdl
+*- [Bb]ackup ([0-9][0-9]).rdl
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# CodeRush personal settings
+.cr/personal
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
+
+# OpenCover UI analysis results
+OpenCover/
+
+# Azure Stream Analytics local run output
+ASALocalRun/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder
+.mfractor/
+
+# Local History for Visual Studio
+.localhistory/
+
+# BeatPulse healthcheck temp database
+healthchecksdb
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/
+
+# Fody - auto-generated XML schema
+FodyWeavers.xsd
+
+# VS Code files for those working on multiple tools
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+# Windows Installer files from build outputs
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# JetBrains Rider
+.idea/
+*.sln.iml
diff --git a/gbdk/gbdk-support/png2asset/Makefile b/gbdk/gbdk-support/png2asset/Makefile
new file mode 100644
index 00000000..fad5212f
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/Makefile
@@ -0,0 +1,60 @@
+# *****************************************************
+# Variables to control Makefile operation
+
+# Might want when doing linux -> win cross build
+# LFLAGS = -s -static
+
+CXX = $(TOOLSPREFIX)g++
+CXXFLAGS = -Os -Wall -g
+LFLAGS = -g
+
+ifeq ($(OS),Windows_NT)
+	BUILD_OS := Windows_NT
+else
+	BUILD_OS := $(shell uname -s)
+endif
+
+# Target older macOS version than whatever build OS is for better compatibility
+ifeq ($(BUILD_OS),Darwin)
+	export MACOSX_DEPLOYMENT_TARGET=10.10
+endif
+
+
+# Static flag for windows cross and native builds
+ifeq ($(TOOLSPREFIX),i686-w64-mingw32-)
+#   prefix will automatically be .exe for cross build
+	EXT = .exe
+	LFLAGS += -static 
+endif
+
+ifeq ($(OS),Windows_NT)
+	EXT = .exe
+	LFLAGS += -static 
+endif
+
+
+
+
+# ****************************************************
+# Targets needed to bring the executable up to date
+
+TARGET = png2asset
+
+
+SRCS := lodepng.cpp png2asset.cpp
+OBJS := $(SRCS:%.cpp=%.o)
+
+$(TARGET): $(OBJS)
+	$(CXX) $(LFLAGS) -o $(TARGET) $(OBJS)
+	strip $@$(EXT)
+
+# The main.o target can be written more simply
+
+%.cpp.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+clean:
+	rm -f *.o
+	rm -f *.exe
+	rm -f TARGET
+
diff --git a/gbdk/gbdk-support/png2asset/lodepng.cpp b/gbdk/gbdk-support/png2asset/lodepng.cpp
new file mode 100644
index 00000000..c6e7f384
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/lodepng.cpp
@@ -0,0 +1,6497 @@
+/*
+LodePNG version 20210627
+
+Copyright (c) 2005-2021 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+/*
+The manual and changelog are in the header file "lodepng.h"
+Rename this file to lodepng.cpp to use it for C++, or to lodepng.c to use it for C.
+*/
+
+#include "lodepng.h"
+
+#ifdef LODEPNG_COMPILE_DISK
+#include <limits.h> /* LONG_MAX */
+#include <stdio.h> /* file handling */
+#endif /* LODEPNG_COMPILE_DISK */
+
+#ifdef LODEPNG_COMPILE_ALLOCATORS
+#include <stdlib.h> /* allocations */
+#endif /* LODEPNG_COMPILE_ALLOCATORS */
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1310) /*Visual Studio: A few warning types are not desired here.*/
+#pragma warning( disable : 4244 ) /*implicit conversions: not warned by gcc -Wall -Wextra and requires too much casts*/
+#pragma warning( disable : 4996 ) /*VS does not like fopen, but fopen_s is not standard C so unusable here*/
+#endif /*_MSC_VER */
+
+const char* LODEPNG_VERSION_STRING = "20210627";
+
+/*
+This source file is built up in the following large parts. The code sections
+with the "LODEPNG_COMPILE_" #defines divide this up further in an intermixed way.
+-Tools for C and common code for PNG and Zlib
+-C Code for Zlib (huffman, deflate, ...)
+-C Code for PNG (file format chunks, adam7, PNG filters, color conversions, ...)
+-The C++ wrapper around all of the above
+*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // Tools for C, and common code for PNG and Zlib.                       // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*The malloc, realloc and free functions defined here with "lodepng_" in front
+of the name, so that you can easily change them to others related to your
+platform if needed. Everything else in the code calls these. Pass
+-DLODEPNG_NO_COMPILE_ALLOCATORS to the compiler, or comment out
+#define LODEPNG_COMPILE_ALLOCATORS in the header, to disable the ones here and
+define them in your own project's source files without needing to change
+lodepng source code. Don't forget to remove "static" if you copypaste them
+from here.*/
+
+#ifdef LODEPNG_COMPILE_ALLOCATORS
+static void* lodepng_malloc(size_t size) {
+#ifdef LODEPNG_MAX_ALLOC
+  if(size > LODEPNG_MAX_ALLOC) return 0;
+#endif
+  return malloc(size);
+}
+
+/* NOTE: when realloc returns NULL, it leaves the original memory untouched */
+static void* lodepng_realloc(void* ptr, size_t new_size) {
+#ifdef LODEPNG_MAX_ALLOC
+  if(new_size > LODEPNG_MAX_ALLOC) return 0;
+#endif
+  return realloc(ptr, new_size);
+}
+
+static void lodepng_free(void* ptr) {
+  free(ptr);
+}
+#else /*LODEPNG_COMPILE_ALLOCATORS*/
+/* TODO: support giving additional void* payload to the custom allocators */
+void* lodepng_malloc(size_t size);
+void* lodepng_realloc(void* ptr, size_t new_size);
+void lodepng_free(void* ptr);
+#endif /*LODEPNG_COMPILE_ALLOCATORS*/
+
+/* convince the compiler to inline a function, for use when this measurably improves performance */
+/* inline is not available in C90, but use it when supported by the compiler */
+#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || (defined(__cplusplus) && (__cplusplus >= 199711L))
+#define LODEPNG_INLINE inline
+#else
+#define LODEPNG_INLINE /* not available */
+#endif
+
+/* restrict is not available in C90, but use it when supported by the compiler */
+#if (defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))) ||\
+    (defined(_MSC_VER) && (_MSC_VER >= 1400)) || \
+    (defined(__WATCOMC__) && (__WATCOMC__ >= 1250) && !defined(__cplusplus))
+#define LODEPNG_RESTRICT __restrict
+#else
+#define LODEPNG_RESTRICT /* not available */
+#endif
+
+/* Replacements for C library functions such as memcpy and strlen, to support platforms
+where a full C library is not available. The compiler can recognize them and compile
+to something as fast. */
+
+static void lodepng_memcpy(void* LODEPNG_RESTRICT dst,
+                           const void* LODEPNG_RESTRICT src, size_t size) {
+  size_t i;
+  for(i = 0; i < size; i++) ((char*)dst)[i] = ((const char*)src)[i];
+}
+
+static void lodepng_memset(void* LODEPNG_RESTRICT dst,
+                           int value, size_t num) {
+  size_t i;
+  for(i = 0; i < num; i++) ((char*)dst)[i] = (char)value;
+}
+
+/* does not check memory out of bounds, do not use on untrusted data */
+static size_t lodepng_strlen(const char* a) {
+  const char* orig = a;
+  /* avoid warning about unused function in case of disabled COMPILE... macros */
+  (void)(&lodepng_strlen);
+  while(*a) a++;
+  return (size_t)(a - orig);
+}
+
+#define LODEPNG_MAX(a, b) (((a) > (b)) ? (a) : (b))
+#define LODEPNG_MIN(a, b) (((a) < (b)) ? (a) : (b))
+#define LODEPNG_ABS(x) ((x) < 0 ? -(x) : (x))
+
+#if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_DECODER)
+/* Safely check if adding two integers will overflow (no undefined
+behavior, compiler removing the code, etc...) and output result. */
+static int lodepng_addofl(size_t a, size_t b, size_t* result) {
+  *result = a + b; /* Unsigned addition is well defined and safe in C90 */
+  return *result < a;
+}
+#endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_DECODER)*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/* Safely check if multiplying two integers will overflow (no undefined
+behavior, compiler removing the code, etc...) and output result. */
+static int lodepng_mulofl(size_t a, size_t b, size_t* result) {
+  *result = a * b; /* Unsigned multiplication is well defined and safe in C90 */
+  return (a != 0 && *result / a != b);
+}
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/* Safely check if a + b > c, even if overflow could happen. */
+static int lodepng_gtofl(size_t a, size_t b, size_t c) {
+  size_t d;
+  if(lodepng_addofl(a, b, &d)) return 1;
+  return d > c;
+}
+#endif /*LODEPNG_COMPILE_ZLIB*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+
+/*
+Often in case of an error a value is assigned to a variable and then it breaks
+out of a loop (to go to the cleanup phase of a function). This macro does that.
+It makes the error handling code shorter and more readable.
+
+Example: if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83);
+*/
+#define CERROR_BREAK(errorvar, code){\
+  errorvar = code;\
+  break;\
+}
+
+/*version of CERROR_BREAK that assumes the common case where the error variable is named "error"*/
+#define ERROR_BREAK(code) CERROR_BREAK(error, code)
+
+/*Set error var to the error code, and return it.*/
+#define CERROR_RETURN_ERROR(errorvar, code){\
+  errorvar = code;\
+  return code;\
+}
+
+/*Try the code, if it returns error, also return the error.*/
+#define CERROR_TRY_RETURN(call){\
+  unsigned error = call;\
+  if(error) return error;\
+}
+
+/*Set error var to the error code, and return from the void function.*/
+#define CERROR_RETURN(errorvar, code){\
+  errorvar = code;\
+  return;\
+}
+
+/*
+About uivector, ucvector and string:
+-All of them wrap dynamic arrays or text strings in a similar way.
+-LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version.
+-The string tools are made to avoid problems with compilers that declare things like strncat as deprecated.
+-They're not used in the interface, only internally in this file as static functions.
+-As with many other structs in this file, the init and cleanup functions serve as ctor and dtor.
+*/
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_ENCODER
+/*dynamic vector of unsigned ints*/
+typedef struct uivector {
+  unsigned* data;
+  size_t size; /*size in number of unsigned longs*/
+  size_t allocsize; /*allocated size in bytes*/
+} uivector;
+
+static void uivector_cleanup(void* p) {
+  ((uivector*)p)->size = ((uivector*)p)->allocsize = 0;
+  lodepng_free(((uivector*)p)->data);
+  ((uivector*)p)->data = NULL;
+}
+
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned uivector_resize(uivector* p, size_t size) {
+  size_t allocsize = size * sizeof(unsigned);
+  if(allocsize > p->allocsize) {
+    size_t newsize = allocsize + (p->allocsize >> 1u);
+    void* data = lodepng_realloc(p->data, newsize);
+    if(data) {
+      p->allocsize = newsize;
+      p->data = (unsigned*)data;
+    }
+    else return 0; /*error: not enough memory*/
+  }
+  p->size = size;
+  return 1; /*success*/
+}
+
+static void uivector_init(uivector* p) {
+  p->data = NULL;
+  p->size = p->allocsize = 0;
+}
+
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned uivector_push_back(uivector* p, unsigned c) {
+  if(!uivector_resize(p, p->size + 1)) return 0;
+  p->data[p->size - 1] = c;
+  return 1;
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+/* /////////////////////////////////////////////////////////////////////////// */
+
+/*dynamic vector of unsigned chars*/
+typedef struct ucvector {
+  unsigned char* data;
+  size_t size; /*used size*/
+  size_t allocsize; /*allocated size*/
+} ucvector;
+
+/*returns 1 if success, 0 if failure ==> nothing done*/
+static unsigned ucvector_resize(ucvector* p, size_t size) {
+  if(size > p->allocsize) {
+    size_t newsize = size + (p->allocsize >> 1u);
+    void* data = lodepng_realloc(p->data, newsize);
+    if(data) {
+      p->allocsize = newsize;
+      p->data = (unsigned char*)data;
+    }
+    else return 0; /*error: not enough memory*/
+  }
+  p->size = size;
+  return 1; /*success*/
+}
+
+static ucvector ucvector_init(unsigned char* buffer, size_t size) {
+  ucvector v;
+  v.data = buffer;
+  v.allocsize = v.size = size;
+  return v;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_PNG
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+/*free string pointer and set it to NULL*/
+static void string_cleanup(char** out) {
+  lodepng_free(*out);
+  *out = NULL;
+}
+
+/*also appends null termination character*/
+static char* alloc_string_sized(const char* in, size_t insize) {
+  char* out = (char*)lodepng_malloc(insize + 1);
+  if(out) {
+    lodepng_memcpy(out, in, insize);
+    out[insize] = 0;
+  }
+  return out;
+}
+
+/* dynamically allocates a new string with a copy of the null terminated input text */
+static char* alloc_string(const char* in) {
+  return alloc_string_sized(in, lodepng_strlen(in));
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_PNG)
+static unsigned lodepng_read32bitInt(const unsigned char* buffer) {
+  return (((unsigned)buffer[0] << 24u) | ((unsigned)buffer[1] << 16u) |
+         ((unsigned)buffer[2] << 8u) | (unsigned)buffer[3]);
+}
+#endif /*defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_PNG)*/
+
+#if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)
+/*buffer must have at least 4 allocated bytes available*/
+static void lodepng_set32bitInt(unsigned char* buffer, unsigned value) {
+  buffer[0] = (unsigned char)((value >> 24) & 0xff);
+  buffer[1] = (unsigned char)((value >> 16) & 0xff);
+  buffer[2] = (unsigned char)((value >>  8) & 0xff);
+  buffer[3] = (unsigned char)((value      ) & 0xff);
+}
+#endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / File IO                                                                / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_DISK
+
+/* returns negative value on error. This should be pure C compatible, so no fstat. */
+static long lodepng_filesize(const char* filename) {
+  FILE* file;
+  long size;
+  file = fopen(filename, "rb");
+  if(!file) return -1;
+
+  if(fseek(file, 0, SEEK_END) != 0) {
+    fclose(file);
+    return -1;
+  }
+
+  size = ftell(file);
+  /* It may give LONG_MAX as directory size, this is invalid for us. */
+  if(size == LONG_MAX) size = -1;
+
+  fclose(file);
+  return size;
+}
+
+/* load file into buffer that already has the correct allocated size. Returns error code.*/
+static unsigned lodepng_buffer_file(unsigned char* out, size_t size, const char* filename) {
+  FILE* file;
+  size_t readsize;
+  file = fopen(filename, "rb");
+  if(!file) return 78;
+
+  readsize = fread(out, 1, size, file);
+  fclose(file);
+
+  if(readsize != size) return 78;
+  return 0;
+}
+
+unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename) {
+  long size = lodepng_filesize(filename);
+  if(size < 0) return 78;
+  *outsize = (size_t)size;
+
+  *out = (unsigned char*)lodepng_malloc((size_t)size);
+  if(!(*out) && size > 0) return 83; /*the above malloc failed*/
+
+  return lodepng_buffer_file(*out, (size_t)size, filename);
+}
+
+/*write given buffer to the file, overwriting the file, it doesn't append to it.*/
+unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename) {
+  FILE* file;
+  file = fopen(filename, "wb" );
+  if(!file) return 79;
+  fwrite(buffer, 1, buffersize, file);
+  fclose(file);
+  return 0;
+}
+
+#endif /*LODEPNG_COMPILE_DISK*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // End of common code and tools. Begin of Zlib related code.            // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_ENCODER
+
+typedef struct {
+  ucvector* data;
+  unsigned char bp; /*ok to overflow, indicates bit pos inside byte*/
+} LodePNGBitWriter;
+
+static void LodePNGBitWriter_init(LodePNGBitWriter* writer, ucvector* data) {
+  writer->data = data;
+  writer->bp = 0;
+}
+
+/*TODO: this ignores potential out of memory errors*/
+#define WRITEBIT(writer, bit){\
+  /* append new byte */\
+  if(((writer->bp) & 7u) == 0) {\
+    if(!ucvector_resize(writer->data, writer->data->size + 1)) return;\
+    writer->data->data[writer->data->size - 1] = 0;\
+  }\
+  (writer->data->data[writer->data->size - 1]) |= (bit << ((writer->bp) & 7u));\
+  ++writer->bp;\
+}
+
+/* LSB of value is written first, and LSB of bytes is used first */
+static void writeBits(LodePNGBitWriter* writer, unsigned value, size_t nbits) {
+  if(nbits == 1) { /* compiler should statically compile this case if nbits == 1 */
+    WRITEBIT(writer, value);
+  } else {
+    /* TODO: increase output size only once here rather than in each WRITEBIT */
+    size_t i;
+    for(i = 0; i != nbits; ++i) {
+      WRITEBIT(writer, (unsigned char)((value >> i) & 1));
+    }
+  }
+}
+
+/* This one is to use for adding huffman symbol, the value bits are written MSB first */
+static void writeBitsReversed(LodePNGBitWriter* writer, unsigned value, size_t nbits) {
+  size_t i;
+  for(i = 0; i != nbits; ++i) {
+    /* TODO: increase output size only once here rather than in each WRITEBIT */
+    WRITEBIT(writer, (unsigned char)((value >> (nbits - 1u - i)) & 1u));
+  }
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+typedef struct {
+  const unsigned char* data;
+  size_t size; /*size of data in bytes*/
+  size_t bitsize; /*size of data in bits, end of valid bp values, should be 8*size*/
+  size_t bp;
+  unsigned buffer; /*buffer for reading bits. NOTE: 'unsigned' must support at least 32 bits*/
+} LodePNGBitReader;
+
+/* data size argument is in bytes. Returns error if size too large causing overflow */
+static unsigned LodePNGBitReader_init(LodePNGBitReader* reader, const unsigned char* data, size_t size) {
+  size_t temp;
+  reader->data = data;
+  reader->size = size;
+  /* size in bits, return error if overflow (if size_t is 32 bit this supports up to 500MB)  */
+  if(lodepng_mulofl(size, 8u, &reader->bitsize)) return 105;
+  /*ensure incremented bp can be compared to bitsize without overflow even when it would be incremented 32 too much and
+  trying to ensure 32 more bits*/
+  if(lodepng_addofl(reader->bitsize, 64u, &temp)) return 105;
+  reader->bp = 0;
+  reader->buffer = 0;
+  return 0; /*ok*/
+}
+
+/*
+ensureBits functions:
+Ensures the reader can at least read nbits bits in one or more readBits calls,
+safely even if not enough bits are available.
+Returns 1 if there are enough bits available, 0 if not.
+*/
+
+/*See ensureBits documentation above. This one ensures exactly 1 bit */
+/*static unsigned ensureBits1(LodePNGBitReader* reader) {
+  if(reader->bp >= reader->bitsize) return 0;
+  reader->buffer = (unsigned)reader->data[reader->bp >> 3u] >> (reader->bp & 7u);
+  return 1;
+}*/
+
+/*See ensureBits documentation above. This one ensures up to 9 bits */
+static unsigned ensureBits9(LodePNGBitReader* reader, size_t nbits) {
+  size_t start = reader->bp >> 3u;
+  size_t size = reader->size;
+  if(start + 1u < size) {
+    reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u);
+    reader->buffer >>= (reader->bp & 7u);
+    return 1;
+  } else {
+    reader->buffer = 0;
+    if(start + 0u < size) reader->buffer |= reader->data[start + 0];
+    reader->buffer >>= (reader->bp & 7u);
+    return reader->bp + nbits <= reader->bitsize;
+  }
+}
+
+/*See ensureBits documentation above. This one ensures up to 17 bits */
+static unsigned ensureBits17(LodePNGBitReader* reader, size_t nbits) {
+  size_t start = reader->bp >> 3u;
+  size_t size = reader->size;
+  if(start + 2u < size) {
+    reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) |
+                     ((unsigned)reader->data[start + 2] << 16u);
+    reader->buffer >>= (reader->bp & 7u);
+    return 1;
+  } else {
+    reader->buffer = 0;
+    if(start + 0u < size) reader->buffer |= reader->data[start + 0];
+    if(start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u);
+    reader->buffer >>= (reader->bp & 7u);
+    return reader->bp + nbits <= reader->bitsize;
+  }
+}
+
+/*See ensureBits documentation above. This one ensures up to 25 bits */
+static LODEPNG_INLINE unsigned ensureBits25(LodePNGBitReader* reader, size_t nbits) {
+  size_t start = reader->bp >> 3u;
+  size_t size = reader->size;
+  if(start + 3u < size) {
+    reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) |
+                     ((unsigned)reader->data[start + 2] << 16u) | ((unsigned)reader->data[start + 3] << 24u);
+    reader->buffer >>= (reader->bp & 7u);
+    return 1;
+  } else {
+    reader->buffer = 0;
+    if(start + 0u < size) reader->buffer |= reader->data[start + 0];
+    if(start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u);
+    if(start + 2u < size) reader->buffer |= ((unsigned)reader->data[start + 2] << 16u);
+    reader->buffer >>= (reader->bp & 7u);
+    return reader->bp + nbits <= reader->bitsize;
+  }
+}
+
+/*See ensureBits documentation above. This one ensures up to 32 bits */
+static LODEPNG_INLINE unsigned ensureBits32(LodePNGBitReader* reader, size_t nbits) {
+  size_t start = reader->bp >> 3u;
+  size_t size = reader->size;
+  if(start + 4u < size) {
+    reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) |
+                     ((unsigned)reader->data[start + 2] << 16u) | ((unsigned)reader->data[start + 3] << 24u);
+    reader->buffer >>= (reader->bp & 7u);
+    reader->buffer |= (((unsigned)reader->data[start + 4] << 24u) << (8u - (reader->bp & 7u)));
+    return 1;
+  } else {
+    reader->buffer = 0;
+    if(start + 0u < size) reader->buffer |= reader->data[start + 0];
+    if(start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u);
+    if(start + 2u < size) reader->buffer |= ((unsigned)reader->data[start + 2] << 16u);
+    if(start + 3u < size) reader->buffer |= ((unsigned)reader->data[start + 3] << 24u);
+    reader->buffer >>= (reader->bp & 7u);
+    return reader->bp + nbits <= reader->bitsize;
+  }
+}
+
+/* Get bits without advancing the bit pointer. Must have enough bits available with ensureBits. Max nbits is 31. */
+static unsigned peekBits(LodePNGBitReader* reader, size_t nbits) {
+  /* The shift allows nbits to be only up to 31. */
+  return reader->buffer & ((1u << nbits) - 1u);
+}
+
+/* Must have enough bits available with ensureBits */
+static void advanceBits(LodePNGBitReader* reader, size_t nbits) {
+  reader->buffer >>= nbits;
+  reader->bp += nbits;
+}
+
+/* Must have enough bits available with ensureBits */
+static unsigned readBits(LodePNGBitReader* reader, size_t nbits) {
+  unsigned result = peekBits(reader, nbits);
+  advanceBits(reader, nbits);
+  return result;
+}
+
+/* Public for testing only. steps and result must have numsteps values. */
+unsigned lode_png_test_bitreader(const unsigned char* data, size_t size,
+                                 size_t numsteps, const size_t* steps, unsigned* result) {
+  size_t i;
+  LodePNGBitReader reader;
+  unsigned error = LodePNGBitReader_init(&reader, data, size);
+  if(error) return 0;
+  for(i = 0; i < numsteps; i++) {
+    size_t step = steps[i];
+    unsigned ok;
+    if(step > 25) ok = ensureBits32(&reader, step);
+    else if(step > 17) ok = ensureBits25(&reader, step);
+    else if(step > 9) ok = ensureBits17(&reader, step);
+    else ok = ensureBits9(&reader, step);
+    if(!ok) return 0;
+    result[i] = readBits(&reader, step);
+  }
+  return 1;
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+static unsigned reverseBits(unsigned bits, unsigned num) {
+  /*TODO: implement faster lookup table based version when needed*/
+  unsigned i, result = 0;
+  for(i = 0; i < num; i++) result |= ((bits >> (num - i - 1u)) & 1u) << i;
+  return result;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Deflate - Huffman                                                      / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#define FIRST_LENGTH_CODE_INDEX 257
+#define LAST_LENGTH_CODE_INDEX 285
+/*256 literals, the end code, some length codes, and 2 unused codes*/
+#define NUM_DEFLATE_CODE_SYMBOLS 288
+/*the distance codes have their own symbols, 30 used, 2 unused*/
+#define NUM_DISTANCE_SYMBOLS 32
+/*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/
+#define NUM_CODE_LENGTH_CODES 19
+
+/*the base lengths represented by codes 257-285*/
+static const unsigned LENGTHBASE[29]
+  = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59,
+     67, 83, 99, 115, 131, 163, 195, 227, 258};
+
+/*the extra bits used by codes 257-285 (added to base length)*/
+static const unsigned LENGTHEXTRA[29]
+  = {0, 0, 0, 0, 0, 0, 0,  0,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  3,
+      4,  4,  4,   4,   5,   5,   5,   5,   0};
+
+/*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/
+static const unsigned DISTANCEBASE[30]
+  = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513,
+     769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
+
+/*the extra bits of backwards distances (added to base)*/
+static const unsigned DISTANCEEXTRA[30]
+  = {0, 0, 0, 0, 1, 1, 2,  2,  3,  3,  4,  4,  5,  5,   6,   6,   7,   7,   8,
+       8,    9,    9,   10,   10,   11,   11,   12,    12,    13,    13};
+
+/*the order in which "code length alphabet code lengths" are stored as specified by deflate, out of this the huffman
+tree of the dynamic huffman tree lengths is generated*/
+static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES]
+  = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+Huffman tree struct, containing multiple representations of the tree
+*/
+typedef struct HuffmanTree {
+  unsigned* codes; /*the huffman codes (bit patterns representing the symbols)*/
+  unsigned* lengths; /*the lengths of the huffman codes*/
+  unsigned maxbitlen; /*maximum number of bits a single code can get*/
+  unsigned numcodes; /*number of symbols in the alphabet = number of codes*/
+  /* for reading only */
+  unsigned char* table_len; /*length of symbol from lookup table, or max length if secondary lookup needed*/
+  unsigned short* table_value; /*value of symbol from lookup table, or pointer to secondary table if needed*/
+} HuffmanTree;
+
+static void HuffmanTree_init(HuffmanTree* tree) {
+  tree->codes = 0;
+  tree->lengths = 0;
+  tree->table_len = 0;
+  tree->table_value = 0;
+}
+
+static void HuffmanTree_cleanup(HuffmanTree* tree) {
+  lodepng_free(tree->codes);
+  lodepng_free(tree->lengths);
+  lodepng_free(tree->table_len);
+  lodepng_free(tree->table_value);
+}
+
+/* amount of bits for first huffman table lookup (aka root bits), see HuffmanTree_makeTable and huffmanDecodeSymbol.*/
+/* values 8u and 9u work the fastest */
+#define FIRSTBITS 9u
+
+/* a symbol value too big to represent any valid symbol, to indicate reading disallowed huffman bits combination,
+which is possible in case of only 0 or 1 present symbols. */
+#define INVALIDSYMBOL 65535u
+
+/* make table for huffman decoding */
+static unsigned HuffmanTree_makeTable(HuffmanTree* tree) {
+  static const unsigned headsize = 1u << FIRSTBITS; /*size of the first table*/
+  static const unsigned mask = (1u << FIRSTBITS) /*headsize*/ - 1u;
+  size_t i, numpresent, pointer, size; /*total table size*/
+  unsigned* maxlens = (unsigned*)lodepng_malloc(headsize * sizeof(unsigned));
+  if(!maxlens) return 83; /*alloc fail*/
+
+  /* compute maxlens: max total bit length of symbols sharing prefix in the first table*/
+  lodepng_memset(maxlens, 0, headsize * sizeof(*maxlens));
+  for(i = 0; i < tree->numcodes; i++) {
+    unsigned symbol = tree->codes[i];
+    unsigned l = tree->lengths[i];
+    unsigned index;
+    if(l <= FIRSTBITS) continue; /*symbols that fit in first table don't increase secondary table size*/
+    /*get the FIRSTBITS MSBs, the MSBs of the symbol are encoded first. See later comment about the reversing*/
+    index = reverseBits(symbol >> (l - FIRSTBITS), FIRSTBITS);
+    maxlens[index] = LODEPNG_MAX(maxlens[index], l);
+  }
+  /* compute total table size: size of first table plus all secondary tables for symbols longer than FIRSTBITS */
+  size = headsize;
+  for(i = 0; i < headsize; ++i) {
+    unsigned l = maxlens[i];
+    if(l > FIRSTBITS) size += (1u << (l - FIRSTBITS));
+  }
+  tree->table_len = (unsigned char*)lodepng_malloc(size * sizeof(*tree->table_len));
+  tree->table_value = (unsigned short*)lodepng_malloc(size * sizeof(*tree->table_value));
+  if(!tree->table_len || !tree->table_value) {
+    lodepng_free(maxlens);
+    /* freeing tree->table values is done at a higher scope */
+    return 83; /*alloc fail*/
+  }
+  /*initialize with an invalid length to indicate unused entries*/
+  for(i = 0; i < size; ++i) tree->table_len[i] = 16;
+
+  /*fill in the first table for long symbols: max prefix size and pointer to secondary tables*/
+  pointer = headsize;
+  for(i = 0; i < headsize; ++i) {
+    unsigned l = maxlens[i];
+    if(l <= FIRSTBITS) continue;
+    tree->table_len[i] = l;
+    tree->table_value[i] = pointer;
+    pointer += (1u << (l - FIRSTBITS));
+  }
+  lodepng_free(maxlens);
+
+  /*fill in the first table for short symbols, or secondary table for long symbols*/
+  numpresent = 0;
+  for(i = 0; i < tree->numcodes; ++i) {
+    unsigned l = tree->lengths[i];
+    unsigned symbol = tree->codes[i]; /*the huffman bit pattern. i itself is the value.*/
+    /*reverse bits, because the huffman bits are given in MSB first order but the bit reader reads LSB first*/
+    unsigned reverse = reverseBits(symbol, l);
+    if(l == 0) continue;
+    numpresent++;
+
+    if(l <= FIRSTBITS) {
+      /*short symbol, fully in first table, replicated num times if l < FIRSTBITS*/
+      unsigned num = 1u << (FIRSTBITS - l);
+      unsigned j;
+      for(j = 0; j < num; ++j) {
+        /*bit reader will read the l bits of symbol first, the remaining FIRSTBITS - l bits go to the MSB's*/
+        unsigned index = reverse | (j << l);
+        if(tree->table_len[index] != 16) return 55; /*invalid tree: long symbol shares prefix with short symbol*/
+        tree->table_len[index] = l;
+        tree->table_value[index] = i;
+      }
+    } else {
+      /*long symbol, shares prefix with other long symbols in first lookup table, needs second lookup*/
+      /*the FIRSTBITS MSBs of the symbol are the first table index*/
+      unsigned index = reverse & mask;
+      unsigned maxlen = tree->table_len[index];
+      /*log2 of secondary table length, should be >= l - FIRSTBITS*/
+      unsigned tablelen = maxlen - FIRSTBITS;
+      unsigned start = tree->table_value[index]; /*starting index in secondary table*/
+      unsigned num = 1u << (tablelen - (l - FIRSTBITS)); /*amount of entries of this symbol in secondary table*/
+      unsigned j;
+      if(maxlen < l) return 55; /*invalid tree: long symbol shares prefix with short symbol*/
+      for(j = 0; j < num; ++j) {
+        unsigned reverse2 = reverse >> FIRSTBITS; /* l - FIRSTBITS bits */
+        unsigned index2 = start + (reverse2 | (j << (l - FIRSTBITS)));
+        tree->table_len[index2] = l;
+        tree->table_value[index2] = i;
+      }
+    }
+  }
+
+  if(numpresent < 2) {
+    /* In case of exactly 1 symbol, in theory the huffman symbol needs 0 bits,
+    but deflate uses 1 bit instead. In case of 0 symbols, no symbols can
+    appear at all, but such huffman tree could still exist (e.g. if distance
+    codes are never used). In both cases, not all symbols of the table will be
+    filled in. Fill them in with an invalid symbol value so returning them from
+    huffmanDecodeSymbol will cause error. */
+    for(i = 0; i < size; ++i) {
+      if(tree->table_len[i] == 16) {
+        /* As length, use a value smaller than FIRSTBITS for the head table,
+        and a value larger than FIRSTBITS for the secondary table, to ensure
+        valid behavior for advanceBits when reading this symbol. */
+        tree->table_len[i] = (i < headsize) ? 1 : (FIRSTBITS + 1);
+        tree->table_value[i] = INVALIDSYMBOL;
+      }
+    }
+  } else {
+    /* A good huffman tree has N * 2 - 1 nodes, of which N - 1 are internal nodes.
+    If that is not the case (due to too long length codes), the table will not
+    have been fully used, and this is an error (not all bit combinations can be
+    decoded): an oversubscribed huffman tree, indicated by error 55. */
+    for(i = 0; i < size; ++i) {
+      if(tree->table_len[i] == 16) return 55;
+    }
+  }
+
+  return 0;
+}
+
+/*
+Second step for the ...makeFromLengths and ...makeFromFrequencies functions.
+numcodes, lengths and maxbitlen must already be filled in correctly. return
+value is error.
+*/
+static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) {
+  unsigned* blcount;
+  unsigned* nextcode;
+  unsigned error = 0;
+  unsigned bits, n;
+
+  tree->codes = (unsigned*)lodepng_malloc(tree->numcodes * sizeof(unsigned));
+  blcount = (unsigned*)lodepng_malloc((tree->maxbitlen + 1) * sizeof(unsigned));
+  nextcode = (unsigned*)lodepng_malloc((tree->maxbitlen + 1) * sizeof(unsigned));
+  if(!tree->codes || !blcount || !nextcode) error = 83; /*alloc fail*/
+
+  if(!error) {
+    for(n = 0; n != tree->maxbitlen + 1; n++) blcount[n] = nextcode[n] = 0;
+    /*step 1: count number of instances of each code length*/
+    for(bits = 0; bits != tree->numcodes; ++bits) ++blcount[tree->lengths[bits]];
+    /*step 2: generate the nextcode values*/
+    for(bits = 1; bits <= tree->maxbitlen; ++bits) {
+      nextcode[bits] = (nextcode[bits - 1] + blcount[bits - 1]) << 1u;
+    }
+    /*step 3: generate all the codes*/
+    for(n = 0; n != tree->numcodes; ++n) {
+      if(tree->lengths[n] != 0) {
+        tree->codes[n] = nextcode[tree->lengths[n]]++;
+        /*remove superfluous bits from the code*/
+        tree->codes[n] &= ((1u << tree->lengths[n]) - 1u);
+      }
+    }
+  }
+
+  lodepng_free(blcount);
+  lodepng_free(nextcode);
+
+  if(!error) error = HuffmanTree_makeTable(tree);
+  return error;
+}
+
+/*
+given the code lengths (as stored in the PNG file), generate the tree as defined
+by Deflate. maxbitlen is the maximum bits that a code in the tree can have.
+return value is error.
+*/
+static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen,
+                                            size_t numcodes, unsigned maxbitlen) {
+  unsigned i;
+  tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned));
+  if(!tree->lengths) return 83; /*alloc fail*/
+  for(i = 0; i != numcodes; ++i) tree->lengths[i] = bitlen[i];
+  tree->numcodes = (unsigned)numcodes; /*number of symbols*/
+  tree->maxbitlen = maxbitlen;
+  return HuffmanTree_makeFromLengths2(tree);
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/*BPM: Boundary Package Merge, see "A Fast and Space-Economical Algorithm for Length-Limited Coding",
+Jyrki Katajainen, Alistair Moffat, Andrew Turpin, 1995.*/
+
+/*chain node for boundary package merge*/
+typedef struct BPMNode {
+  int weight; /*the sum of all weights in this chain*/
+  unsigned index; /*index of this leaf node (called "count" in the paper)*/
+  struct BPMNode* tail; /*the next nodes in this chain (null if last)*/
+  int in_use;
+} BPMNode;
+
+/*lists of chains*/
+typedef struct BPMLists {
+  /*memory pool*/
+  unsigned memsize;
+  BPMNode* memory;
+  unsigned numfree;
+  unsigned nextfree;
+  BPMNode** freelist;
+  /*two heads of lookahead chains per list*/
+  unsigned listsize;
+  BPMNode** chains0;
+  BPMNode** chains1;
+} BPMLists;
+
+/*creates a new chain node with the given parameters, from the memory in the lists */
+static BPMNode* bpmnode_create(BPMLists* lists, int weight, unsigned index, BPMNode* tail) {
+  unsigned i;
+  BPMNode* result;
+
+  /*memory full, so garbage collect*/
+  if(lists->nextfree >= lists->numfree) {
+    /*mark only those that are in use*/
+    for(i = 0; i != lists->memsize; ++i) lists->memory[i].in_use = 0;
+    for(i = 0; i != lists->listsize; ++i) {
+      BPMNode* node;
+      for(node = lists->chains0[i]; node != 0; node = node->tail) node->in_use = 1;
+      for(node = lists->chains1[i]; node != 0; node = node->tail) node->in_use = 1;
+    }
+    /*collect those that are free*/
+    lists->numfree = 0;
+    for(i = 0; i != lists->memsize; ++i) {
+      if(!lists->memory[i].in_use) lists->freelist[lists->numfree++] = &lists->memory[i];
+    }
+    lists->nextfree = 0;
+  }
+
+  result = lists->freelist[lists->nextfree++];
+  result->weight = weight;
+  result->index = index;
+  result->tail = tail;
+  return result;
+}
+
+/*sort the leaves with stable mergesort*/
+static void bpmnode_sort(BPMNode* leaves, size_t num) {
+  BPMNode* mem = (BPMNode*)lodepng_malloc(sizeof(*leaves) * num);
+  size_t width, counter = 0;
+  for(width = 1; width < num; width *= 2) {
+    BPMNode* a = (counter & 1) ? mem : leaves;
+    BPMNode* b = (counter & 1) ? leaves : mem;
+    size_t p;
+    for(p = 0; p < num; p += 2 * width) {
+      size_t q = (p + width > num) ? num : (p + width);
+      size_t r = (p + 2 * width > num) ? num : (p + 2 * width);
+      size_t i = p, j = q, k;
+      for(k = p; k < r; k++) {
+        if(i < q && (j >= r || a[i].weight <= a[j].weight)) b[k] = a[i++];
+        else b[k] = a[j++];
+      }
+    }
+    counter++;
+  }
+  if(counter & 1) lodepng_memcpy(leaves, mem, sizeof(*leaves) * num);
+  lodepng_free(mem);
+}
+
+/*Boundary Package Merge step, numpresent is the amount of leaves, and c is the current chain.*/
+static void boundaryPM(BPMLists* lists, BPMNode* leaves, size_t numpresent, int c, int num) {
+  unsigned lastindex = lists->chains1[c]->index;
+
+  if(c == 0) {
+    if(lastindex >= numpresent) return;
+    lists->chains0[c] = lists->chains1[c];
+    lists->chains1[c] = bpmnode_create(lists, leaves[lastindex].weight, lastindex + 1, 0);
+  } else {
+    /*sum of the weights of the head nodes of the previous lookahead chains.*/
+    int sum = lists->chains0[c - 1]->weight + lists->chains1[c - 1]->weight;
+    lists->chains0[c] = lists->chains1[c];
+    if(lastindex < numpresent && sum > leaves[lastindex].weight) {
+      lists->chains1[c] = bpmnode_create(lists, leaves[lastindex].weight, lastindex + 1, lists->chains1[c]->tail);
+      return;
+    }
+    lists->chains1[c] = bpmnode_create(lists, sum, lastindex, lists->chains1[c - 1]);
+    /*in the end we are only interested in the chain of the last list, so no
+    need to recurse if we're at the last one (this gives measurable speedup)*/
+    if(num + 1 < (int)(2 * numpresent - 2)) {
+      boundaryPM(lists, leaves, numpresent, c - 1, num);
+      boundaryPM(lists, leaves, numpresent, c - 1, num);
+    }
+  }
+}
+
+unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies,
+                                      size_t numcodes, unsigned maxbitlen) {
+  unsigned error = 0;
+  unsigned i;
+  size_t numpresent = 0; /*number of symbols with non-zero frequency*/
+  BPMNode* leaves; /*the symbols, only those with > 0 frequency*/
+
+  if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/
+  if((1u << maxbitlen) < (unsigned)numcodes) return 80; /*error: represent all symbols*/
+
+  leaves = (BPMNode*)lodepng_malloc(numcodes * sizeof(*leaves));
+  if(!leaves) return 83; /*alloc fail*/
+
+  for(i = 0; i != numcodes; ++i) {
+    if(frequencies[i] > 0) {
+      leaves[numpresent].weight = (int)frequencies[i];
+      leaves[numpresent].index = i;
+      ++numpresent;
+    }
+  }
+
+  lodepng_memset(lengths, 0, numcodes * sizeof(*lengths));
+
+  /*ensure at least two present symbols. There should be at least one symbol
+  according to RFC 1951 section 3.2.7. Some decoders incorrectly require two. To
+  make these work as well ensure there are at least two symbols. The
+  Package-Merge code below also doesn't work correctly if there's only one
+  symbol, it'd give it the theoretical 0 bits but in practice zlib wants 1 bit*/
+  if(numpresent == 0) {
+    lengths[0] = lengths[1] = 1; /*note that for RFC 1951 section 3.2.7, only lengths[0] = 1 is needed*/
+  } else if(numpresent == 1) {
+    lengths[leaves[0].index] = 1;
+    lengths[leaves[0].index == 0 ? 1 : 0] = 1;
+  } else {
+    BPMLists lists;
+    BPMNode* node;
+
+    bpmnode_sort(leaves, numpresent);
+
+    lists.listsize = maxbitlen;
+    lists.memsize = 2 * maxbitlen * (maxbitlen + 1);
+    lists.nextfree = 0;
+    lists.numfree = lists.memsize;
+    lists.memory = (BPMNode*)lodepng_malloc(lists.memsize * sizeof(*lists.memory));
+    lists.freelist = (BPMNode**)lodepng_malloc(lists.memsize * sizeof(BPMNode*));
+    lists.chains0 = (BPMNode**)lodepng_malloc(lists.listsize * sizeof(BPMNode*));
+    lists.chains1 = (BPMNode**)lodepng_malloc(lists.listsize * sizeof(BPMNode*));
+    if(!lists.memory || !lists.freelist || !lists.chains0 || !lists.chains1) error = 83; /*alloc fail*/
+
+    if(!error) {
+      for(i = 0; i != lists.memsize; ++i) lists.freelist[i] = &lists.memory[i];
+
+      bpmnode_create(&lists, leaves[0].weight, 1, 0);
+      bpmnode_create(&lists, leaves[1].weight, 2, 0);
+
+      for(i = 0; i != lists.listsize; ++i) {
+        lists.chains0[i] = &lists.memory[0];
+        lists.chains1[i] = &lists.memory[1];
+      }
+
+      /*each boundaryPM call adds one chain to the last list, and we need 2 * numpresent - 2 chains.*/
+      for(i = 2; i != 2 * numpresent - 2; ++i) boundaryPM(&lists, leaves, numpresent, (int)maxbitlen - 1, (int)i);
+
+      for(node = lists.chains1[maxbitlen - 1]; node; node = node->tail) {
+        for(i = 0; i != node->index; ++i) ++lengths[leaves[i].index];
+      }
+    }
+
+    lodepng_free(lists.memory);
+    lodepng_free(lists.freelist);
+    lodepng_free(lists.chains0);
+    lodepng_free(lists.chains1);
+  }
+
+  lodepng_free(leaves);
+  return error;
+}
+
+/*Create the Huffman tree given the symbol frequencies*/
+static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies,
+                                                size_t mincodes, size_t numcodes, unsigned maxbitlen) {
+  unsigned error = 0;
+  while(!frequencies[numcodes - 1] && numcodes > mincodes) --numcodes; /*trim zeroes*/
+  tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned));
+  if(!tree->lengths) return 83; /*alloc fail*/
+  tree->maxbitlen = maxbitlen;
+  tree->numcodes = (unsigned)numcodes; /*number of symbols*/
+
+  error = lodepng_huffman_code_lengths(tree->lengths, frequencies, numcodes, maxbitlen);
+  if(!error) error = HuffmanTree_makeFromLengths2(tree);
+  return error;
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/
+static unsigned generateFixedLitLenTree(HuffmanTree* tree) {
+  unsigned i, error = 0;
+  unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned));
+  if(!bitlen) return 83; /*alloc fail*/
+
+  /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/
+  for(i =   0; i <= 143; ++i) bitlen[i] = 8;
+  for(i = 144; i <= 255; ++i) bitlen[i] = 9;
+  for(i = 256; i <= 279; ++i) bitlen[i] = 7;
+  for(i = 280; i <= 287; ++i) bitlen[i] = 8;
+
+  error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DEFLATE_CODE_SYMBOLS, 15);
+
+  lodepng_free(bitlen);
+  return error;
+}
+
+/*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/
+static unsigned generateFixedDistanceTree(HuffmanTree* tree) {
+  unsigned i, error = 0;
+  unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned));
+  if(!bitlen) return 83; /*alloc fail*/
+
+  /*there are 32 distance codes, but 30-31 are unused*/
+  for(i = 0; i != NUM_DISTANCE_SYMBOLS; ++i) bitlen[i] = 5;
+  error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DISTANCE_SYMBOLS, 15);
+
+  lodepng_free(bitlen);
+  return error;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/*
+returns the code. The bit reader must already have been ensured at least 15 bits
+*/
+static unsigned huffmanDecodeSymbol(LodePNGBitReader* reader, const HuffmanTree* codetree) {
+  unsigned short code = peekBits(reader, FIRSTBITS);
+  unsigned short l = codetree->table_len[code];
+  unsigned short value = codetree->table_value[code];
+  if(l <= FIRSTBITS) {
+    advanceBits(reader, l);
+    return value;
+  } else {
+    unsigned index2;
+    advanceBits(reader, FIRSTBITS);
+    index2 = value + peekBits(reader, l - FIRSTBITS);
+    advanceBits(reader, codetree->table_len[index2] - FIRSTBITS);
+    return codetree->table_value[index2];
+  }
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Inflator (Decompressor)                                                / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*get the tree of a deflated block with fixed tree, as specified in the deflate specification
+Returns error code.*/
+static unsigned getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) {
+  unsigned error = generateFixedLitLenTree(tree_ll);
+  if(error) return error;
+  return generateFixedDistanceTree(tree_d);
+}
+
+/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/
+static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d,
+                                      LodePNGBitReader* reader) {
+  /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/
+  unsigned error = 0;
+  unsigned n, HLIT, HDIST, HCLEN, i;
+
+  /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/
+  unsigned* bitlen_ll = 0; /*lit,len code lengths*/
+  unsigned* bitlen_d = 0; /*dist code lengths*/
+  /*code length code lengths ("clcl"), the bit lengths of the huffman tree used to compress bitlen_ll and bitlen_d*/
+  unsigned* bitlen_cl = 0;
+  HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/
+
+  if(!ensureBits17(reader, 14)) return 49; /*error: the bit pointer is or will go past the memory*/
+
+  /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/
+  HLIT =  readBits(reader, 5) + 257;
+  /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/
+  HDIST = readBits(reader, 5) + 1;
+  /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/
+  HCLEN = readBits(reader, 4) + 4;
+
+  bitlen_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned));
+  if(!bitlen_cl) return 83 /*alloc fail*/;
+
+  HuffmanTree_init(&tree_cl);
+
+  while(!error) {
+    /*read the code length codes out of 3 * (amount of code length codes) bits*/
+    if(lodepng_gtofl(reader->bp, HCLEN * 3, reader->bitsize)) {
+      ERROR_BREAK(50); /*error: the bit pointer is or will go past the memory*/
+    }
+    for(i = 0; i != HCLEN; ++i) {
+      ensureBits9(reader, 3); /*out of bounds already checked above */
+      bitlen_cl[CLCL_ORDER[i]] = readBits(reader, 3);
+    }
+    for(i = HCLEN; i != NUM_CODE_LENGTH_CODES; ++i) {
+      bitlen_cl[CLCL_ORDER[i]] = 0;
+    }
+
+    error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl, NUM_CODE_LENGTH_CODES, 7);
+    if(error) break;
+
+    /*now we can use this tree to read the lengths for the tree that this function will return*/
+    bitlen_ll = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned));
+    bitlen_d = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned));
+    if(!bitlen_ll || !bitlen_d) ERROR_BREAK(83 /*alloc fail*/);
+    lodepng_memset(bitlen_ll, 0, NUM_DEFLATE_CODE_SYMBOLS * sizeof(*bitlen_ll));
+    lodepng_memset(bitlen_d, 0, NUM_DISTANCE_SYMBOLS * sizeof(*bitlen_d));
+
+    /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/
+    i = 0;
+    while(i < HLIT + HDIST) {
+      unsigned code;
+      ensureBits25(reader, 22); /* up to 15 bits for huffman code, up to 7 extra bits below*/
+      code = huffmanDecodeSymbol(reader, &tree_cl);
+      if(code <= 15) /*a length code*/ {
+        if(i < HLIT) bitlen_ll[i] = code;
+        else bitlen_d[i - HLIT] = code;
+        ++i;
+      } else if(code == 16) /*repeat previous*/ {
+        unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/
+        unsigned value; /*set value to the previous code*/
+
+        if(i == 0) ERROR_BREAK(54); /*can't repeat previous if i is 0*/
+
+        replength += readBits(reader, 2);
+
+        if(i < HLIT + 1) value = bitlen_ll[i - 1];
+        else value = bitlen_d[i - HLIT - 1];
+        /*repeat this value in the next lengths*/
+        for(n = 0; n < replength; ++n) {
+          if(i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/
+          if(i < HLIT) bitlen_ll[i] = value;
+          else bitlen_d[i - HLIT] = value;
+          ++i;
+        }
+      } else if(code == 17) /*repeat "0" 3-10 times*/ {
+        unsigned replength = 3; /*read in the bits that indicate repeat length*/
+        replength += readBits(reader, 3);
+
+        /*repeat this value in the next lengths*/
+        for(n = 0; n < replength; ++n) {
+          if(i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/
+
+          if(i < HLIT) bitlen_ll[i] = 0;
+          else bitlen_d[i - HLIT] = 0;
+          ++i;
+        }
+      } else if(code == 18) /*repeat "0" 11-138 times*/ {
+        unsigned replength = 11; /*read in the bits that indicate repeat length*/
+        replength += readBits(reader, 7);
+
+        /*repeat this value in the next lengths*/
+        for(n = 0; n < replength; ++n) {
+          if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/
+
+          if(i < HLIT) bitlen_ll[i] = 0;
+          else bitlen_d[i - HLIT] = 0;
+          ++i;
+        }
+      } else /*if(code == INVALIDSYMBOL)*/ {
+        ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/
+      }
+      /*check if any of the ensureBits above went out of bounds*/
+      if(reader->bp > reader->bitsize) {
+        /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
+        (10=no endcode, 11=wrong jump outside of tree)*/
+        /* TODO: revise error codes 10,11,50: the above comment is no longer valid */
+        ERROR_BREAK(50); /*error, bit pointer jumps past memory*/
+      }
+    }
+    if(error) break;
+
+    if(bitlen_ll[256] == 0) ERROR_BREAK(64); /*the length of the end code 256 must be larger than 0*/
+
+    /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/
+    error = HuffmanTree_makeFromLengths(tree_ll, bitlen_ll, NUM_DEFLATE_CODE_SYMBOLS, 15);
+    if(error) break;
+    error = HuffmanTree_makeFromLengths(tree_d, bitlen_d, NUM_DISTANCE_SYMBOLS, 15);
+
+    break; /*end of error-while*/
+  }
+
+  lodepng_free(bitlen_cl);
+  lodepng_free(bitlen_ll);
+  lodepng_free(bitlen_d);
+  HuffmanTree_cleanup(&tree_cl);
+
+  return error;
+}
+
+/*inflate a block with dynamic of fixed Huffman tree. btype must be 1 or 2.*/
+static unsigned inflateHuffmanBlock(ucvector* out, LodePNGBitReader* reader,
+                                    unsigned btype, size_t max_output_size) {
+  unsigned error = 0;
+  HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/
+  HuffmanTree tree_d; /*the huffman tree for distance codes*/
+
+  HuffmanTree_init(&tree_ll);
+  HuffmanTree_init(&tree_d);
+
+  if(btype == 1) error = getTreeInflateFixed(&tree_ll, &tree_d);
+  else /*if(btype == 2)*/ error = getTreeInflateDynamic(&tree_ll, &tree_d, reader);
+
+  while(!error) /*decode all symbols until end reached, breaks at end code*/ {
+    /*code_ll is literal, length or end code*/
+    unsigned code_ll;
+    ensureBits25(reader, 20); /* up to 15 for the huffman symbol, up to 5 for the length extra bits */
+    code_ll = huffmanDecodeSymbol(reader, &tree_ll);
+    if(code_ll <= 255) /*literal symbol*/ {
+      if(!ucvector_resize(out, out->size + 1)) ERROR_BREAK(83 /*alloc fail*/);
+      out->data[out->size - 1] = (unsigned char)code_ll;
+    } else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/ {
+      unsigned code_d, distance;
+      unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/
+      size_t start, backward, length;
+
+      /*part 1: get length base*/
+      length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX];
+
+      /*part 2: get extra bits and add the value of that to length*/
+      numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX];
+      if(numextrabits_l != 0) {
+        /* bits already ensured above */
+        length += readBits(reader, numextrabits_l);
+      }
+
+      /*part 3: get distance code*/
+      ensureBits32(reader, 28); /* up to 15 for the huffman symbol, up to 13 for the extra bits */
+      code_d = huffmanDecodeSymbol(reader, &tree_d);
+      if(code_d > 29) {
+        if(code_d <= 31) {
+          ERROR_BREAK(18); /*error: invalid distance code (30-31 are never used)*/
+        } else /* if(code_d == INVALIDSYMBOL) */{
+          ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/
+        }
+      }
+      distance = DISTANCEBASE[code_d];
+
+      /*part 4: get extra bits from distance*/
+      numextrabits_d = DISTANCEEXTRA[code_d];
+      if(numextrabits_d != 0) {
+        /* bits already ensured above */
+        distance += readBits(reader, numextrabits_d);
+      }
+
+      /*part 5: fill in all the out[n] values based on the length and dist*/
+      start = out->size;
+      if(distance > start) ERROR_BREAK(52); /*too long backward distance*/
+      backward = start - distance;
+
+      if(!ucvector_resize(out, out->size + length)) ERROR_BREAK(83 /*alloc fail*/);
+      if(distance < length) {
+        size_t forward;
+        lodepng_memcpy(out->data + start, out->data + backward, distance);
+        start += distance;
+        for(forward = distance; forward < length; ++forward) {
+          out->data[start++] = out->data[backward++];
+        }
+      } else {
+        lodepng_memcpy(out->data + start, out->data + backward, length);
+      }
+    } else if(code_ll == 256) {
+      break; /*end code, break the loop*/
+    } else /*if(code_ll == INVALIDSYMBOL)*/ {
+      ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/
+    }
+    /*check if any of the ensureBits above went out of bounds*/
+    if(reader->bp > reader->bitsize) {
+      /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol
+      (10=no endcode, 11=wrong jump outside of tree)*/
+      /* TODO: revise error codes 10,11,50: the above comment is no longer valid */
+      ERROR_BREAK(51); /*error, bit pointer jumps past memory*/
+    }
+    if(max_output_size && out->size > max_output_size) {
+      ERROR_BREAK(109); /*error, larger than max size*/
+    }
+  }
+
+  HuffmanTree_cleanup(&tree_ll);
+  HuffmanTree_cleanup(&tree_d);
+
+  return error;
+}
+
+static unsigned inflateNoCompression(ucvector* out, LodePNGBitReader* reader,
+                                     const LodePNGDecompressSettings* settings) {
+  size_t bytepos;
+  size_t size = reader->size;
+  unsigned LEN, NLEN, error = 0;
+
+  /*go to first boundary of byte*/
+  bytepos = (reader->bp + 7u) >> 3u;
+
+  /*read LEN (2 bytes) and NLEN (2 bytes)*/
+  if(bytepos + 4 >= size) return 52; /*error, bit pointer will jump past memory*/
+  LEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2;
+  NLEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2;
+
+  /*check if 16-bit NLEN is really the one's complement of LEN*/
+  if(!settings->ignore_nlen && LEN + NLEN != 65535) {
+    return 21; /*error: NLEN is not one's complement of LEN*/
+  }
+
+  if(!ucvector_resize(out, out->size + LEN)) return 83; /*alloc fail*/
+
+  /*read the literal data: LEN bytes are now stored in the out buffer*/
+  if(bytepos + LEN > size) return 23; /*error: reading outside of in buffer*/
+
+  lodepng_memcpy(out->data + out->size - LEN, reader->data + bytepos, LEN);
+  bytepos += LEN;
+
+  reader->bp = bytepos << 3u;
+
+  return error;
+}
+
+static unsigned lodepng_inflatev(ucvector* out,
+                                 const unsigned char* in, size_t insize,
+                                 const LodePNGDecompressSettings* settings) {
+  unsigned BFINAL = 0;
+  LodePNGBitReader reader;
+  unsigned error = LodePNGBitReader_init(&reader, in, insize);
+
+  if(error) return error;
+
+  while(!BFINAL) {
+    unsigned BTYPE;
+    if(!ensureBits9(&reader, 3)) return 52; /*error, bit pointer will jump past memory*/
+    BFINAL = readBits(&reader, 1);
+    BTYPE = readBits(&reader, 2);
+
+    if(BTYPE == 3) return 20; /*error: invalid BTYPE*/
+    else if(BTYPE == 0) error = inflateNoCompression(out, &reader, settings); /*no compression*/
+    else error = inflateHuffmanBlock(out, &reader, BTYPE, settings->max_output_size); /*compression, BTYPE 01 or 10*/
+    if(!error && settings->max_output_size && out->size > settings->max_output_size) error = 109;
+    if(error) break;
+  }
+
+  return error;
+}
+
+unsigned lodepng_inflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGDecompressSettings* settings) {
+  ucvector v = ucvector_init(*out, *outsize);
+  unsigned error = lodepng_inflatev(&v, in, insize, settings);
+  *out = v.data;
+  *outsize = v.size;
+  return error;
+}
+
+static unsigned inflatev(ucvector* out, const unsigned char* in, size_t insize,
+                        const LodePNGDecompressSettings* settings) {
+  if(settings->custom_inflate) {
+    unsigned error = settings->custom_inflate(&out->data, &out->size, in, insize, settings);
+    out->allocsize = out->size;
+    if(error) {
+      /*the custom inflate is allowed to have its own error codes, however, we translate it to code 110*/
+      error = 110;
+      /*if there's a max output size, and the custom zlib returned error, then indicate that error instead*/
+      if(settings->max_output_size && out->size > settings->max_output_size) error = 109;
+    }
+    return error;
+  } else {
+    return lodepng_inflatev(out, in, insize, settings);
+  }
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Deflator (Compressor)                                                  / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258;
+
+/*search the index in the array, that has the largest value smaller than or equal to the given value,
+given array must be sorted (if no value is smaller, it returns the size of the given array)*/
+static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) {
+  /*binary search (only small gain over linear). TODO: use CPU log2 instruction for getting symbols instead*/
+  size_t left = 1;
+  size_t right = array_size - 1;
+
+  while(left <= right) {
+    size_t mid = (left + right) >> 1;
+    if(array[mid] >= value) right = mid - 1;
+    else left = mid + 1;
+  }
+  if(left >= array_size || array[left] > value) left--;
+  return left;
+}
+
+static void addLengthDistance(uivector* values, size_t length, size_t distance) {
+  /*values in encoded vector are those used by deflate:
+  0-255: literal bytes
+  256: end
+  257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits)
+  286-287: invalid*/
+
+  unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length);
+  unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]);
+  unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance);
+  unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]);
+
+  size_t pos = values->size;
+  /*TODO: return error when this fails (out of memory)*/
+  unsigned ok = uivector_resize(values, values->size + 4);
+  if(ok) {
+    values->data[pos + 0] = length_code + FIRST_LENGTH_CODE_INDEX;
+    values->data[pos + 1] = extra_length;
+    values->data[pos + 2] = dist_code;
+    values->data[pos + 3] = extra_distance;
+  }
+}
+
+/*3 bytes of data get encoded into two bytes. The hash cannot use more than 3
+bytes as input because 3 is the minimum match length for deflate*/
+static const unsigned HASH_NUM_VALUES = 65536;
+static const unsigned HASH_BIT_MASK = 65535; /*HASH_NUM_VALUES - 1, but C90 does not like that as initializer*/
+
+typedef struct Hash {
+  int* head; /*hash value to head circular pos - can be outdated if went around window*/
+  /*circular pos to prev circular pos*/
+  unsigned short* chain;
+  int* val; /*circular pos to hash value*/
+
+  /*TODO: do this not only for zeros but for any repeated byte. However for PNG
+  it's always going to be the zeros that dominate, so not important for PNG*/
+  int* headz; /*similar to head, but for chainz*/
+  unsigned short* chainz; /*those with same amount of zeros*/
+  unsigned short* zeros; /*length of zeros streak, used as a second hash chain*/
+} Hash;
+
+static unsigned hash_init(Hash* hash, unsigned windowsize) {
+  unsigned i;
+  hash->head = (int*)lodepng_malloc(sizeof(int) * HASH_NUM_VALUES);
+  hash->val = (int*)lodepng_malloc(sizeof(int) * windowsize);
+  hash->chain = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize);
+
+  hash->zeros = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize);
+  hash->headz = (int*)lodepng_malloc(sizeof(int) * (MAX_SUPPORTED_DEFLATE_LENGTH + 1));
+  hash->chainz = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize);
+
+  if(!hash->head || !hash->chain || !hash->val  || !hash->headz|| !hash->chainz || !hash->zeros) {
+    return 83; /*alloc fail*/
+  }
+
+  /*initialize hash table*/
+  for(i = 0; i != HASH_NUM_VALUES; ++i) hash->head[i] = -1;
+  for(i = 0; i != windowsize; ++i) hash->val[i] = -1;
+  for(i = 0; i != windowsize; ++i) hash->chain[i] = i; /*same value as index indicates uninitialized*/
+
+  for(i = 0; i <= MAX_SUPPORTED_DEFLATE_LENGTH; ++i) hash->headz[i] = -1;
+  for(i = 0; i != windowsize; ++i) hash->chainz[i] = i; /*same value as index indicates uninitialized*/
+
+  return 0;
+}
+
+static void hash_cleanup(Hash* hash) {
+  lodepng_free(hash->head);
+  lodepng_free(hash->val);
+  lodepng_free(hash->chain);
+
+  lodepng_free(hash->zeros);
+  lodepng_free(hash->headz);
+  lodepng_free(hash->chainz);
+}
+
+
+
+static unsigned getHash(const unsigned char* data, size_t size, size_t pos) {
+  unsigned result = 0;
+  if(pos + 2 < size) {
+    /*A simple shift and xor hash is used. Since the data of PNGs is dominated
+    by zeroes due to the filters, a better hash does not have a significant
+    effect on speed in traversing the chain, and causes more time spend on
+    calculating the hash.*/
+    result ^= ((unsigned)data[pos + 0] << 0u);
+    result ^= ((unsigned)data[pos + 1] << 4u);
+    result ^= ((unsigned)data[pos + 2] << 8u);
+  } else {
+    size_t amount, i;
+    if(pos >= size) return 0;
+    amount = size - pos;
+    for(i = 0; i != amount; ++i) result ^= ((unsigned)data[pos + i] << (i * 8u));
+  }
+  return result & HASH_BIT_MASK;
+}
+
+static unsigned countZeros(const unsigned char* data, size_t size, size_t pos) {
+  const unsigned char* start = data + pos;
+  const unsigned char* end = start + MAX_SUPPORTED_DEFLATE_LENGTH;
+  if(end > data + size) end = data + size;
+  data = start;
+  while(data != end && *data == 0) ++data;
+  /*subtracting two addresses returned as 32-bit number (max value is MAX_SUPPORTED_DEFLATE_LENGTH)*/
+  return (unsigned)(data - start);
+}
+
+/*wpos = pos & (windowsize - 1)*/
+static void updateHashChain(Hash* hash, size_t wpos, unsigned hashval, unsigned short numzeros) {
+  hash->val[wpos] = (int)hashval;
+  if(hash->head[hashval] != -1) hash->chain[wpos] = hash->head[hashval];
+  hash->head[hashval] = (int)wpos;
+
+  hash->zeros[wpos] = numzeros;
+  if(hash->headz[numzeros] != -1) hash->chainz[wpos] = hash->headz[numzeros];
+  hash->headz[numzeros] = (int)wpos;
+}
+
+/*
+LZ77-encode the data. Return value is error code. The input are raw bytes, the output
+is in the form of unsigned integers with codes representing for example literal bytes, or
+length/distance pairs.
+It uses a hash table technique to let it encode faster. When doing LZ77 encoding, a
+sliding window (of windowsize) is used, and all past bytes in that window can be used as
+the "dictionary". A brute force search through all possible distances would be slow, and
+this hash technique is one out of several ways to speed this up.
+*/
+static unsigned encodeLZ77(uivector* out, Hash* hash,
+                           const unsigned char* in, size_t inpos, size_t insize, unsigned windowsize,
+                           unsigned minmatch, unsigned nicematch, unsigned lazymatching) {
+  size_t pos;
+  unsigned i, error = 0;
+  /*for large window lengths, assume the user wants no compression loss. Otherwise, max hash chain length speedup.*/
+  unsigned maxchainlength = windowsize >= 8192 ? windowsize : windowsize / 8u;
+  unsigned maxlazymatch = windowsize >= 8192 ? MAX_SUPPORTED_DEFLATE_LENGTH : 64;
+
+  unsigned usezeros = 1; /*not sure if setting it to false for windowsize < 8192 is better or worse*/
+  unsigned numzeros = 0;
+
+  unsigned offset; /*the offset represents the distance in LZ77 terminology*/
+  unsigned length;
+  unsigned lazy = 0;
+  unsigned lazylength = 0, lazyoffset = 0;
+  unsigned hashval;
+  unsigned current_offset, current_length;
+  unsigned prev_offset;
+  const unsigned char *lastptr, *foreptr, *backptr;
+  unsigned hashpos;
+
+  if(windowsize == 0 || windowsize > 32768) return 60; /*error: windowsize smaller/larger than allowed*/
+  if((windowsize & (windowsize - 1)) != 0) return 90; /*error: must be power of two*/
+
+  if(nicematch > MAX_SUPPORTED_DEFLATE_LENGTH) nicematch = MAX_SUPPORTED_DEFLATE_LENGTH;
+
+  for(pos = inpos; pos < insize; ++pos) {
+    size_t wpos = pos & (windowsize - 1); /*position for in 'circular' hash buffers*/
+    unsigned chainlength = 0;
+
+    hashval = getHash(in, insize, pos);
+
+    if(usezeros && hashval == 0) {
+      if(numzeros == 0) numzeros = countZeros(in, insize, pos);
+      else if(pos + numzeros > insize || in[pos + numzeros - 1] != 0) --numzeros;
+    } else {
+      numzeros = 0;
+    }
+
+    updateHashChain(hash, wpos, hashval, numzeros);
+
+    /*the length and offset found for the current position*/
+    length = 0;
+    offset = 0;
+
+    hashpos = hash->chain[wpos];
+
+    lastptr = &in[insize < pos + MAX_SUPPORTED_DEFLATE_LENGTH ? insize : pos + MAX_SUPPORTED_DEFLATE_LENGTH];
+
+    /*search for the longest string*/
+    prev_offset = 0;
+    for(;;) {
+      if(chainlength++ >= maxchainlength) break;
+      current_offset = (unsigned)(hashpos <= wpos ? wpos - hashpos : wpos - hashpos + windowsize);
+
+      if(current_offset < prev_offset) break; /*stop when went completely around the circular buffer*/
+      prev_offset = current_offset;
+      if(current_offset > 0) {
+        /*test the next characters*/
+        foreptr = &in[pos];
+        backptr = &in[pos - current_offset];
+
+        /*common case in PNGs is lots of zeros. Quickly skip over them as a speedup*/
+        if(numzeros >= 3) {
+          unsigned skip = hash->zeros[hashpos];
+          if(skip > numzeros) skip = numzeros;
+          backptr += skip;
+          foreptr += skip;
+        }
+
+        while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/ {
+          ++backptr;
+          ++foreptr;
+        }
+        current_length = (unsigned)(foreptr - &in[pos]);
+
+        if(current_length > length) {
+          length = current_length; /*the longest length*/
+          offset = current_offset; /*the offset that is related to this longest length*/
+          /*jump out once a length of max length is found (speed gain). This also jumps
+          out if length is MAX_SUPPORTED_DEFLATE_LENGTH*/
+          if(current_length >= nicematch) break;
+        }
+      }
+
+      if(hashpos == hash->chain[hashpos]) break;
+
+      if(numzeros >= 3 && length > numzeros) {
+        hashpos = hash->chainz[hashpos];
+        if(hash->zeros[hashpos] != numzeros) break;
+      } else {
+        hashpos = hash->chain[hashpos];
+        /*outdated hash value, happens if particular value was not encountered in whole last window*/
+        if(hash->val[hashpos] != (int)hashval) break;
+      }
+    }
+
+    if(lazymatching) {
+      if(!lazy && length >= 3 && length <= maxlazymatch && length < MAX_SUPPORTED_DEFLATE_LENGTH) {
+        lazy = 1;
+        lazylength = length;
+        lazyoffset = offset;
+        continue; /*try the next byte*/
+      }
+      if(lazy) {
+        lazy = 0;
+        if(pos == 0) ERROR_BREAK(81);
+        if(length > lazylength + 1) {
+          /*push the previous character as literal*/
+          if(!uivector_push_back(out, in[pos - 1])) ERROR_BREAK(83 /*alloc fail*/);
+        } else {
+          length = lazylength;
+          offset = lazyoffset;
+          hash->head[hashval] = -1; /*the same hashchain update will be done, this ensures no wrong alteration*/
+          hash->headz[numzeros] = -1; /*idem*/
+          --pos;
+        }
+      }
+    }
+    if(length >= 3 && offset > windowsize) ERROR_BREAK(86 /*too big (or overflown negative) offset*/);
+
+    /*encode it as length/distance pair or literal value*/
+    if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ {
+      if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/);
+    } else if(length < minmatch || (length == 3 && offset > 4096)) {
+      /*compensate for the fact that longer offsets have more extra bits, a
+      length of only 3 may be not worth it then*/
+      if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/);
+    } else {
+      addLengthDistance(out, length, offset);
+      for(i = 1; i < length; ++i) {
+        ++pos;
+        wpos = pos & (windowsize - 1);
+        hashval = getHash(in, insize, pos);
+        if(usezeros && hashval == 0) {
+          if(numzeros == 0) numzeros = countZeros(in, insize, pos);
+          else if(pos + numzeros > insize || in[pos + numzeros - 1] != 0) --numzeros;
+        } else {
+          numzeros = 0;
+        }
+        updateHashChain(hash, wpos, hashval, numzeros);
+      }
+    }
+  } /*end of the loop through each character of input*/
+
+  return error;
+}
+
+/* /////////////////////////////////////////////////////////////////////////// */
+
+static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) {
+  /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte,
+  2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/
+
+  size_t i, numdeflateblocks = (datasize + 65534u) / 65535u;
+  unsigned datapos = 0;
+  for(i = 0; i != numdeflateblocks; ++i) {
+    unsigned BFINAL, BTYPE, LEN, NLEN;
+    unsigned char firstbyte;
+    size_t pos = out->size;
+
+    BFINAL = (i == numdeflateblocks - 1);
+    BTYPE = 0;
+
+    LEN = 65535;
+    if(datasize - datapos < 65535u) LEN = (unsigned)datasize - datapos;
+    NLEN = 65535 - LEN;
+
+    if(!ucvector_resize(out, out->size + LEN + 5)) return 83; /*alloc fail*/
+
+    firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1u) << 1u) + ((BTYPE & 2u) << 1u));
+    out->data[pos + 0] = firstbyte;
+    out->data[pos + 1] = (unsigned char)(LEN & 255);
+    out->data[pos + 2] = (unsigned char)(LEN >> 8u);
+    out->data[pos + 3] = (unsigned char)(NLEN & 255);
+    out->data[pos + 4] = (unsigned char)(NLEN >> 8u);
+    lodepng_memcpy(out->data + pos + 5, data + datapos, LEN);
+    datapos += LEN;
+  }
+
+  return 0;
+}
+
+/*
+write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees.
+tree_ll: the tree for lit and len codes.
+tree_d: the tree for distance codes.
+*/
+static void writeLZ77data(LodePNGBitWriter* writer, const uivector* lz77_encoded,
+                          const HuffmanTree* tree_ll, const HuffmanTree* tree_d) {
+  size_t i = 0;
+  for(i = 0; i != lz77_encoded->size; ++i) {
+    unsigned val = lz77_encoded->data[i];
+    writeBitsReversed(writer, tree_ll->codes[val], tree_ll->lengths[val]);
+    if(val > 256) /*for a length code, 3 more things have to be added*/ {
+      unsigned length_index = val - FIRST_LENGTH_CODE_INDEX;
+      unsigned n_length_extra_bits = LENGTHEXTRA[length_index];
+      unsigned length_extra_bits = lz77_encoded->data[++i];
+
+      unsigned distance_code = lz77_encoded->data[++i];
+
+      unsigned distance_index = distance_code;
+      unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index];
+      unsigned distance_extra_bits = lz77_encoded->data[++i];
+
+      writeBits(writer, length_extra_bits, n_length_extra_bits);
+      writeBitsReversed(writer, tree_d->codes[distance_code], tree_d->lengths[distance_code]);
+      writeBits(writer, distance_extra_bits, n_distance_extra_bits);
+    }
+  }
+}
+
+/*Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/
+static unsigned deflateDynamic(LodePNGBitWriter* writer, Hash* hash,
+                               const unsigned char* data, size_t datapos, size_t dataend,
+                               const LodePNGCompressSettings* settings, unsigned final) {
+  unsigned error = 0;
+
+  /*
+  A block is compressed as follows: The PNG data is lz77 encoded, resulting in
+  literal bytes and length/distance pairs. This is then huffman compressed with
+  two huffman trees. One huffman tree is used for the lit and len values ("ll"),
+  another huffman tree is used for the dist values ("d"). These two trees are
+  stored using their code lengths, and to compress even more these code lengths
+  are also run-length encoded and huffman compressed. This gives a huffman tree
+  of code lengths "cl". The code lengths used to describe this third tree are
+  the code length code lengths ("clcl").
+  */
+
+  /*The lz77 encoded data, represented with integers since there will also be length and distance codes in it*/
+  uivector lz77_encoded;
+  HuffmanTree tree_ll; /*tree for lit,len values*/
+  HuffmanTree tree_d; /*tree for distance codes*/
+  HuffmanTree tree_cl; /*tree for encoding the code lengths representing tree_ll and tree_d*/
+  unsigned* frequencies_ll = 0; /*frequency of lit,len codes*/
+  unsigned* frequencies_d = 0; /*frequency of dist codes*/
+  unsigned* frequencies_cl = 0; /*frequency of code length codes*/
+  unsigned* bitlen_lld = 0; /*lit,len,dist code lengths (int bits), literally (without repeat codes).*/
+  unsigned* bitlen_lld_e = 0; /*bitlen_lld encoded with repeat codes (this is a rudimentary run length compression)*/
+  size_t datasize = dataend - datapos;
+
+  /*
+  If we could call "bitlen_cl" the the code length code lengths ("clcl"), that is the bit lengths of codes to represent
+  tree_cl in CLCL_ORDER, then due to the huffman compression of huffman tree representations ("two levels"), there are
+  some analogies:
+  bitlen_lld is to tree_cl what data is to tree_ll and tree_d.
+  bitlen_lld_e is to bitlen_lld what lz77_encoded is to data.
+  bitlen_cl is to bitlen_lld_e what bitlen_lld is to lz77_encoded.
+  */
+
+  unsigned BFINAL = final;
+  size_t i;
+  size_t numcodes_ll, numcodes_d, numcodes_lld, numcodes_lld_e, numcodes_cl;
+  unsigned HLIT, HDIST, HCLEN;
+
+  uivector_init(&lz77_encoded);
+  HuffmanTree_init(&tree_ll);
+  HuffmanTree_init(&tree_d);
+  HuffmanTree_init(&tree_cl);
+  /* could fit on stack, but >1KB is on the larger side so allocate instead */
+  frequencies_ll = (unsigned*)lodepng_malloc(286 * sizeof(*frequencies_ll));
+  frequencies_d = (unsigned*)lodepng_malloc(30 * sizeof(*frequencies_d));
+  frequencies_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(*frequencies_cl));
+
+  if(!frequencies_ll || !frequencies_d || !frequencies_cl) error = 83; /*alloc fail*/
+
+  /*This while loop never loops due to a break at the end, it is here to
+  allow breaking out of it to the cleanup phase on error conditions.*/
+  while(!error) {
+    lodepng_memset(frequencies_ll, 0, 286 * sizeof(*frequencies_ll));
+    lodepng_memset(frequencies_d, 0, 30 * sizeof(*frequencies_d));
+    lodepng_memset(frequencies_cl, 0, NUM_CODE_LENGTH_CODES * sizeof(*frequencies_cl));
+
+    if(settings->use_lz77) {
+      error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize,
+                         settings->minmatch, settings->nicematch, settings->lazymatching);
+      if(error) break;
+    } else {
+      if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83 /*alloc fail*/);
+      for(i = datapos; i < dataend; ++i) lz77_encoded.data[i - datapos] = data[i]; /*no LZ77, but still will be Huffman compressed*/
+    }
+
+    /*Count the frequencies of lit, len and dist codes*/
+    for(i = 0; i != lz77_encoded.size; ++i) {
+      unsigned symbol = lz77_encoded.data[i];
+      ++frequencies_ll[symbol];
+      if(symbol > 256) {
+        unsigned dist = lz77_encoded.data[i + 2];
+        ++frequencies_d[dist];
+        i += 3;
+      }
+    }
+    frequencies_ll[256] = 1; /*there will be exactly 1 end code, at the end of the block*/
+
+    /*Make both huffman trees, one for the lit and len codes, one for the dist codes*/
+    error = HuffmanTree_makeFromFrequencies(&tree_ll, frequencies_ll, 257, 286, 15);
+    if(error) break;
+    /*2, not 1, is chosen for mincodes: some buggy PNG decoders require at least 2 symbols in the dist tree*/
+    error = HuffmanTree_makeFromFrequencies(&tree_d, frequencies_d, 2, 30, 15);
+    if(error) break;
+
+    numcodes_ll = LODEPNG_MIN(tree_ll.numcodes, 286);
+    numcodes_d = LODEPNG_MIN(tree_d.numcodes, 30);
+    /*store the code lengths of both generated trees in bitlen_lld*/
+    numcodes_lld = numcodes_ll + numcodes_d;
+    bitlen_lld = (unsigned*)lodepng_malloc(numcodes_lld * sizeof(*bitlen_lld));
+    /*numcodes_lld_e never needs more size than bitlen_lld*/
+    bitlen_lld_e = (unsigned*)lodepng_malloc(numcodes_lld * sizeof(*bitlen_lld_e));
+    if(!bitlen_lld || !bitlen_lld_e) ERROR_BREAK(83); /*alloc fail*/
+    numcodes_lld_e = 0;
+
+    for(i = 0; i != numcodes_ll; ++i) bitlen_lld[i] = tree_ll.lengths[i];
+    for(i = 0; i != numcodes_d; ++i) bitlen_lld[numcodes_ll + i] = tree_d.lengths[i];
+
+    /*run-length compress bitlen_ldd into bitlen_lld_e by using repeat codes 16 (copy length 3-6 times),
+    17 (3-10 zeroes), 18 (11-138 zeroes)*/
+    for(i = 0; i != numcodes_lld; ++i) {
+      unsigned j = 0; /*amount of repetitions*/
+      while(i + j + 1 < numcodes_lld && bitlen_lld[i + j + 1] == bitlen_lld[i]) ++j;
+
+      if(bitlen_lld[i] == 0 && j >= 2) /*repeat code for zeroes*/ {
+        ++j; /*include the first zero*/
+        if(j <= 10) /*repeat code 17 supports max 10 zeroes*/ {
+          bitlen_lld_e[numcodes_lld_e++] = 17;
+          bitlen_lld_e[numcodes_lld_e++] = j - 3;
+        } else /*repeat code 18 supports max 138 zeroes*/ {
+          if(j > 138) j = 138;
+          bitlen_lld_e[numcodes_lld_e++] = 18;
+          bitlen_lld_e[numcodes_lld_e++] = j - 11;
+        }
+        i += (j - 1);
+      } else if(j >= 3) /*repeat code for value other than zero*/ {
+        size_t k;
+        unsigned num = j / 6u, rest = j % 6u;
+        bitlen_lld_e[numcodes_lld_e++] = bitlen_lld[i];
+        for(k = 0; k < num; ++k) {
+          bitlen_lld_e[numcodes_lld_e++] = 16;
+          bitlen_lld_e[numcodes_lld_e++] = 6 - 3;
+        }
+        if(rest >= 3) {
+          bitlen_lld_e[numcodes_lld_e++] = 16;
+          bitlen_lld_e[numcodes_lld_e++] = rest - 3;
+        }
+        else j -= rest;
+        i += j;
+      } else /*too short to benefit from repeat code*/ {
+        bitlen_lld_e[numcodes_lld_e++] = bitlen_lld[i];
+      }
+    }
+
+    /*generate tree_cl, the huffmantree of huffmantrees*/
+    for(i = 0; i != numcodes_lld_e; ++i) {
+      ++frequencies_cl[bitlen_lld_e[i]];
+      /*after a repeat code come the bits that specify the number of repetitions,
+      those don't need to be in the frequencies_cl calculation*/
+      if(bitlen_lld_e[i] >= 16) ++i;
+    }
+
+    error = HuffmanTree_makeFromFrequencies(&tree_cl, frequencies_cl,
+                                            NUM_CODE_LENGTH_CODES, NUM_CODE_LENGTH_CODES, 7);
+    if(error) break;
+
+    /*compute amount of code-length-code-lengths to output*/
+    numcodes_cl = NUM_CODE_LENGTH_CODES;
+    /*trim zeros at the end (using CLCL_ORDER), but minimum size must be 4 (see HCLEN below)*/
+    while(numcodes_cl > 4u && tree_cl.lengths[CLCL_ORDER[numcodes_cl - 1u]] == 0) {
+      numcodes_cl--;
+    }
+
+    /*
+    Write everything into the output
+
+    After the BFINAL and BTYPE, the dynamic block consists out of the following:
+    - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN
+    - (HCLEN+4)*3 bits code lengths of code length alphabet
+    - HLIT + 257 code lengths of lit/length alphabet (encoded using the code length
+      alphabet, + possible repetition codes 16, 17, 18)
+    - HDIST + 1 code lengths of distance alphabet (encoded using the code length
+      alphabet, + possible repetition codes 16, 17, 18)
+    - compressed data
+    - 256 (end code)
+    */
+
+    /*Write block type*/
+    writeBits(writer, BFINAL, 1);
+    writeBits(writer, 0, 1); /*first bit of BTYPE "dynamic"*/
+    writeBits(writer, 1, 1); /*second bit of BTYPE "dynamic"*/
+
+    /*write the HLIT, HDIST and HCLEN values*/
+    /*all three sizes take trimmed ending zeroes into account, done either by HuffmanTree_makeFromFrequencies
+    or in the loop for numcodes_cl above, which saves space. */
+    HLIT = (unsigned)(numcodes_ll - 257);
+    HDIST = (unsigned)(numcodes_d - 1);
+    HCLEN = (unsigned)(numcodes_cl - 4);
+    writeBits(writer, HLIT, 5);
+    writeBits(writer, HDIST, 5);
+    writeBits(writer, HCLEN, 4);
+
+    /*write the code lengths of the code length alphabet ("bitlen_cl")*/
+    for(i = 0; i != numcodes_cl; ++i) writeBits(writer, tree_cl.lengths[CLCL_ORDER[i]], 3);
+
+    /*write the lengths of the lit/len AND the dist alphabet*/
+    for(i = 0; i != numcodes_lld_e; ++i) {
+      writeBitsReversed(writer, tree_cl.codes[bitlen_lld_e[i]], tree_cl.lengths[bitlen_lld_e[i]]);
+      /*extra bits of repeat codes*/
+      if(bitlen_lld_e[i] == 16) writeBits(writer, bitlen_lld_e[++i], 2);
+      else if(bitlen_lld_e[i] == 17) writeBits(writer, bitlen_lld_e[++i], 3);
+      else if(bitlen_lld_e[i] == 18) writeBits(writer, bitlen_lld_e[++i], 7);
+    }
+
+    /*write the compressed data symbols*/
+    writeLZ77data(writer, &lz77_encoded, &tree_ll, &tree_d);
+    /*error: the length of the end code 256 must be larger than 0*/
+    if(tree_ll.lengths[256] == 0) ERROR_BREAK(64);
+
+    /*write the end code*/
+    writeBitsReversed(writer, tree_ll.codes[256], tree_ll.lengths[256]);
+
+    break; /*end of error-while*/
+  }
+
+  /*cleanup*/
+  uivector_cleanup(&lz77_encoded);
+  HuffmanTree_cleanup(&tree_ll);
+  HuffmanTree_cleanup(&tree_d);
+  HuffmanTree_cleanup(&tree_cl);
+  lodepng_free(frequencies_ll);
+  lodepng_free(frequencies_d);
+  lodepng_free(frequencies_cl);
+  lodepng_free(bitlen_lld);
+  lodepng_free(bitlen_lld_e);
+
+  return error;
+}
+
+static unsigned deflateFixed(LodePNGBitWriter* writer, Hash* hash,
+                             const unsigned char* data,
+                             size_t datapos, size_t dataend,
+                             const LodePNGCompressSettings* settings, unsigned final) {
+  HuffmanTree tree_ll; /*tree for literal values and length codes*/
+  HuffmanTree tree_d; /*tree for distance codes*/
+
+  unsigned BFINAL = final;
+  unsigned error = 0;
+  size_t i;
+
+  HuffmanTree_init(&tree_ll);
+  HuffmanTree_init(&tree_d);
+
+  error = generateFixedLitLenTree(&tree_ll);
+  if(!error) error = generateFixedDistanceTree(&tree_d);
+
+  if(!error) {
+    writeBits(writer, BFINAL, 1);
+    writeBits(writer, 1, 1); /*first bit of BTYPE*/
+    writeBits(writer, 0, 1); /*second bit of BTYPE*/
+
+    if(settings->use_lz77) /*LZ77 encoded*/ {
+      uivector lz77_encoded;
+      uivector_init(&lz77_encoded);
+      error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize,
+                         settings->minmatch, settings->nicematch, settings->lazymatching);
+      if(!error) writeLZ77data(writer, &lz77_encoded, &tree_ll, &tree_d);
+      uivector_cleanup(&lz77_encoded);
+    } else /*no LZ77, but still will be Huffman compressed*/ {
+      for(i = datapos; i < dataend; ++i) {
+        writeBitsReversed(writer, tree_ll.codes[data[i]], tree_ll.lengths[data[i]]);
+      }
+    }
+    /*add END code*/
+    if(!error) writeBitsReversed(writer,tree_ll.codes[256], tree_ll.lengths[256]);
+  }
+
+  /*cleanup*/
+  HuffmanTree_cleanup(&tree_ll);
+  HuffmanTree_cleanup(&tree_d);
+
+  return error;
+}
+
+static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t insize,
+                                 const LodePNGCompressSettings* settings) {
+  unsigned error = 0;
+  size_t i, blocksize, numdeflateblocks;
+  Hash hash;
+  LodePNGBitWriter writer;
+
+  LodePNGBitWriter_init(&writer, out);
+
+  if(settings->btype > 2) return 61;
+  else if(settings->btype == 0) return deflateNoCompression(out, in, insize);
+  else if(settings->btype == 1) blocksize = insize;
+  else /*if(settings->btype == 2)*/ {
+    /*on PNGs, deflate blocks of 65-262k seem to give most dense encoding*/
+    blocksize = insize / 8u + 8;
+    if(blocksize < 65536) blocksize = 65536;
+    if(blocksize > 262144) blocksize = 262144;
+  }
+
+  numdeflateblocks = (insize + blocksize - 1) / blocksize;
+  if(numdeflateblocks == 0) numdeflateblocks = 1;
+
+  error = hash_init(&hash, settings->windowsize);
+
+  if(!error) {
+    for(i = 0; i != numdeflateblocks && !error; ++i) {
+      unsigned final = (i == numdeflateblocks - 1);
+      size_t start = i * blocksize;
+      size_t end = start + blocksize;
+      if(end > insize) end = insize;
+
+      if(settings->btype == 1) error = deflateFixed(&writer, &hash, in, start, end, settings, final);
+      else if(settings->btype == 2) error = deflateDynamic(&writer, &hash, in, start, end, settings, final);
+    }
+  }
+
+  hash_cleanup(&hash);
+
+  return error;
+}
+
+unsigned lodepng_deflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGCompressSettings* settings) {
+  ucvector v = ucvector_init(*out, *outsize);
+  unsigned error = lodepng_deflatev(&v, in, insize, settings);
+  *out = v.data;
+  *outsize = v.size;
+  return error;
+}
+
+static unsigned deflate(unsigned char** out, size_t* outsize,
+                        const unsigned char* in, size_t insize,
+                        const LodePNGCompressSettings* settings) {
+  if(settings->custom_deflate) {
+    unsigned error = settings->custom_deflate(out, outsize, in, insize, settings);
+    /*the custom deflate is allowed to have its own error codes, however, we translate it to code 111*/
+    return error ? 111 : 0;
+  } else {
+    return lodepng_deflate(out, outsize, in, insize, settings);
+  }
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Adler32                                                                / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) {
+  unsigned s1 = adler & 0xffffu;
+  unsigned s2 = (adler >> 16u) & 0xffffu;
+
+  while(len != 0u) {
+    unsigned i;
+    /*at least 5552 sums can be done before the sums overflow, saving a lot of module divisions*/
+    unsigned amount = len > 5552u ? 5552u : len;
+    len -= amount;
+    for(i = 0; i != amount; ++i) {
+      s1 += (*data++);
+      s2 += s1;
+    }
+    s1 %= 65521u;
+    s2 %= 65521u;
+  }
+
+  return (s2 << 16u) | s1;
+}
+
+/*Return the adler32 of the bytes data[0..len-1]*/
+static unsigned adler32(const unsigned char* data, unsigned len) {
+  return update_adler32(1u, data, len);
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Zlib                                                                   / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+static unsigned lodepng_zlib_decompressv(ucvector* out,
+                                         const unsigned char* in, size_t insize,
+                                         const LodePNGDecompressSettings* settings) {
+  unsigned error = 0;
+  unsigned CM, CINFO, FDICT;
+
+  if(insize < 2) return 53; /*error, size of zlib data too small*/
+  /*read information from zlib header*/
+  if((in[0] * 256 + in[1]) % 31 != 0) {
+    /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/
+    return 24;
+  }
+
+  CM = in[0] & 15;
+  CINFO = (in[0] >> 4) & 15;
+  /*FCHECK = in[1] & 31;*/ /*FCHECK is already tested above*/
+  FDICT = (in[1] >> 5) & 1;
+  /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/
+
+  if(CM != 8 || CINFO > 7) {
+    /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/
+    return 25;
+  }
+  if(FDICT != 0) {
+    /*error: the specification of PNG says about the zlib stream:
+      "The additional flags shall not specify a preset dictionary."*/
+    return 26;
+  }
+
+  error = inflatev(out, in + 2, insize - 2, settings);
+  if(error) return error;
+
+  if(!settings->ignore_adler32) {
+    unsigned ADLER32 = lodepng_read32bitInt(&in[insize - 4]);
+    unsigned checksum = adler32(out->data, (unsigned)(out->size));
+    if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/
+  }
+
+  return 0; /*no error*/
+}
+
+
+unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                                 size_t insize, const LodePNGDecompressSettings* settings) {
+  ucvector v = ucvector_init(*out, *outsize);
+  unsigned error = lodepng_zlib_decompressv(&v, in, insize, settings);
+  *out = v.data;
+  *outsize = v.size;
+  return error;
+}
+
+/*expected_size is expected output size, to avoid intermediate allocations. Set to 0 if not known. */
+static unsigned zlib_decompress(unsigned char** out, size_t* outsize, size_t expected_size,
+                                const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) {
+  unsigned error;
+  if(settings->custom_zlib) {
+    error = settings->custom_zlib(out, outsize, in, insize, settings);
+    if(error) {
+      /*the custom zlib is allowed to have its own error codes, however, we translate it to code 110*/
+      error = 110;
+      /*if there's a max output size, and the custom zlib returned error, then indicate that error instead*/
+      if(settings->max_output_size && *outsize > settings->max_output_size) error = 109;
+    }
+  } else {
+    ucvector v = ucvector_init(*out, *outsize);
+    if(expected_size) {
+      /*reserve the memory to avoid intermediate reallocations*/
+      ucvector_resize(&v, *outsize + expected_size);
+      v.size = *outsize;
+    }
+    error = lodepng_zlib_decompressv(&v, in, insize, settings);
+    *out = v.data;
+    *outsize = v.size;
+  }
+  return error;
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                               size_t insize, const LodePNGCompressSettings* settings) {
+  size_t i;
+  unsigned error;
+  unsigned char* deflatedata = 0;
+  size_t deflatesize = 0;
+
+  error = deflate(&deflatedata, &deflatesize, in, insize, settings);
+
+  *out = NULL;
+  *outsize = 0;
+  if(!error) {
+    *outsize = deflatesize + 6;
+    *out = (unsigned char*)lodepng_malloc(*outsize);
+    if(!*out) error = 83; /*alloc fail*/
+  }
+
+  if(!error) {
+    unsigned ADLER32 = adler32(in, (unsigned)insize);
+    /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/
+    unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/
+    unsigned FLEVEL = 0;
+    unsigned FDICT = 0;
+    unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64;
+    unsigned FCHECK = 31 - CMFFLG % 31;
+    CMFFLG += FCHECK;
+
+    (*out)[0] = (unsigned char)(CMFFLG >> 8);
+    (*out)[1] = (unsigned char)(CMFFLG & 255);
+    for(i = 0; i != deflatesize; ++i) (*out)[i + 2] = deflatedata[i];
+    lodepng_set32bitInt(&(*out)[*outsize - 4], ADLER32);
+  }
+
+  lodepng_free(deflatedata);
+  return error;
+}
+
+/* compress using the default or custom zlib function */
+static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                              size_t insize, const LodePNGCompressSettings* settings) {
+  if(settings->custom_zlib) {
+    unsigned error = settings->custom_zlib(out, outsize, in, insize, settings);
+    /*the custom zlib is allowed to have its own error codes, however, we translate it to code 111*/
+    return error ? 111 : 0;
+  } else {
+    return lodepng_zlib_compress(out, outsize, in, insize, settings);
+  }
+}
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#else /*no LODEPNG_COMPILE_ZLIB*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+static unsigned zlib_decompress(unsigned char** out, size_t* outsize, size_t expected_size,
+                                const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) {
+  if(!settings->custom_zlib) return 87; /*no custom zlib function provided */
+  (void)expected_size;
+  return settings->custom_zlib(out, outsize, in, insize, settings);
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in,
+                              size_t insize, const LodePNGCompressSettings* settings) {
+  if(!settings->custom_zlib) return 87; /*no custom zlib function provided */
+  return settings->custom_zlib(out, outsize, in, insize, settings);
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/*this is a good tradeoff between speed and compression ratio*/
+#define DEFAULT_WINDOWSIZE 2048
+
+void lodepng_compress_settings_init(LodePNGCompressSettings* settings) {
+  /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/
+  settings->btype = 2;
+  settings->use_lz77 = 1;
+  settings->windowsize = DEFAULT_WINDOWSIZE;
+  settings->minmatch = 3;
+  settings->nicematch = 128;
+  settings->lazymatching = 1;
+
+  settings->custom_zlib = 0;
+  settings->custom_deflate = 0;
+  settings->custom_context = 0;
+}
+
+const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, DEFAULT_WINDOWSIZE, 3, 128, 1, 0, 0, 0};
+
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings) {
+  settings->ignore_adler32 = 0;
+  settings->ignore_nlen = 0;
+  settings->max_output_size = 0;
+
+  settings->custom_zlib = 0;
+  settings->custom_inflate = 0;
+  settings->custom_context = 0;
+}
+
+const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0, 0, 0, 0};
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // End of Zlib related code. Begin of PNG related code.                 // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_PNG
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / CRC32                                                                  / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+
+#ifndef LODEPNG_NO_COMPILE_CRC
+/* CRC polynomial: 0xedb88320 */
+static unsigned lodepng_crc32_table[256] = {
+           0u, 1996959894u, 3993919788u, 2567524794u,  124634137u, 1886057615u, 3915621685u, 2657392035u,
+   249268274u, 2044508324u, 3772115230u, 2547177864u,  162941995u, 2125561021u, 3887607047u, 2428444049u,
+   498536548u, 1789927666u, 4089016648u, 2227061214u,  450548861u, 1843258603u, 4107580753u, 2211677639u,
+   325883990u, 1684777152u, 4251122042u, 2321926636u,  335633487u, 1661365465u, 4195302755u, 2366115317u,
+   997073096u, 1281953886u, 3579855332u, 2724688242u, 1006888145u, 1258607687u, 3524101629u, 2768942443u,
+   901097722u, 1119000684u, 3686517206u, 2898065728u,  853044451u, 1172266101u, 3705015759u, 2882616665u,
+   651767980u, 1373503546u, 3369554304u, 3218104598u,  565507253u, 1454621731u, 3485111705u, 3099436303u,
+   671266974u, 1594198024u, 3322730930u, 2970347812u,  795835527u, 1483230225u, 3244367275u, 3060149565u,
+  1994146192u,   31158534u, 2563907772u, 4023717930u, 1907459465u,  112637215u, 2680153253u, 3904427059u,
+  2013776290u,  251722036u, 2517215374u, 3775830040u, 2137656763u,  141376813u, 2439277719u, 3865271297u,
+  1802195444u,  476864866u, 2238001368u, 4066508878u, 1812370925u,  453092731u, 2181625025u, 4111451223u,
+  1706088902u,  314042704u, 2344532202u, 4240017532u, 1658658271u,  366619977u, 2362670323u, 4224994405u,
+  1303535960u,  984961486u, 2747007092u, 3569037538u, 1256170817u, 1037604311u, 2765210733u, 3554079995u,
+  1131014506u,  879679996u, 2909243462u, 3663771856u, 1141124467u,  855842277u, 2852801631u, 3708648649u,
+  1342533948u,  654459306u, 3188396048u, 3373015174u, 1466479909u,  544179635u, 3110523913u, 3462522015u,
+  1591671054u,  702138776u, 2966460450u, 3352799412u, 1504918807u,  783551873u, 3082640443u, 3233442989u,
+  3988292384u, 2596254646u,   62317068u, 1957810842u, 3939845945u, 2647816111u,   81470997u, 1943803523u,
+  3814918930u, 2489596804u,  225274430u, 2053790376u, 3826175755u, 2466906013u,  167816743u, 2097651377u,
+  4027552580u, 2265490386u,  503444072u, 1762050814u, 4150417245u, 2154129355u,  426522225u, 1852507879u,
+  4275313526u, 2312317920u,  282753626u, 1742555852u, 4189708143u, 2394877945u,  397917763u, 1622183637u,
+  3604390888u, 2714866558u,  953729732u, 1340076626u, 3518719985u, 2797360999u, 1068828381u, 1219638859u,
+  3624741850u, 2936675148u,  906185462u, 1090812512u, 3747672003u, 2825379669u,  829329135u, 1181335161u,
+  3412177804u, 3160834842u,  628085408u, 1382605366u, 3423369109u, 3138078467u,  570562233u, 1426400815u,
+  3317316542u, 2998733608u,  733239954u, 1555261956u, 3268935591u, 3050360625u,  752459403u, 1541320221u,
+  2607071920u, 3965973030u, 1969922972u,   40735498u, 2617837225u, 3943577151u, 1913087877u,   83908371u,
+  2512341634u, 3803740692u, 2075208622u,  213261112u, 2463272603u, 3855990285u, 2094854071u,  198958881u,
+  2262029012u, 4057260610u, 1759359992u,  534414190u, 2176718541u, 4139329115u, 1873836001u,  414664567u,
+  2282248934u, 4279200368u, 1711684554u,  285281116u, 2405801727u, 4167216745u, 1634467795u,  376229701u,
+  2685067896u, 3608007406u, 1308918612u,  956543938u, 2808555105u, 3495958263u, 1231636301u, 1047427035u,
+  2932959818u, 3654703836u, 1088359270u,  936918000u, 2847714899u, 3736837829u, 1202900863u,  817233897u,
+  3183342108u, 3401237130u, 1404277552u,  615818150u, 3134207493u, 3453421203u, 1423857449u,  601450431u,
+  3009837614u, 3294710456u, 1567103746u,  711928724u, 3020668471u, 3272380065u, 1510334235u,  755167117u
+};
+
+/*Return the CRC of the bytes buf[0..len-1].*/
+unsigned lodepng_crc32(const unsigned char* data, size_t length) {
+  unsigned r = 0xffffffffu;
+  size_t i;
+  for(i = 0; i < length; ++i) {
+    r = lodepng_crc32_table[(r ^ data[i]) & 0xffu] ^ (r >> 8u);
+  }
+  return r ^ 0xffffffffu;
+}
+#else /* !LODEPNG_NO_COMPILE_CRC */
+unsigned lodepng_crc32(const unsigned char* data, size_t length);
+#endif /* !LODEPNG_NO_COMPILE_CRC */
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Reading and writing PNG color channel bits                             / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/* The color channel bits of less-than-8-bit pixels are read with the MSB of bytes first,
+so LodePNGBitWriter and LodePNGBitReader can't be used for those. */
+
+static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) {
+  unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1);
+  ++(*bitpointer);
+  return result;
+}
+
+/* TODO: make this faster */
+static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) {
+  unsigned result = 0;
+  size_t i;
+  for(i = 0 ; i < nbits; ++i) {
+    result <<= 1u;
+    result |= (unsigned)readBitFromReversedStream(bitpointer, bitstream);
+  }
+  return result;
+}
+
+static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) {
+  /*the current bit in bitstream may be 0 or 1 for this to work*/
+  if(bit == 0) bitstream[(*bitpointer) >> 3u] &=  (unsigned char)(~(1u << (7u - ((*bitpointer) & 7u))));
+  else         bitstream[(*bitpointer) >> 3u] |=  (1u << (7u - ((*bitpointer) & 7u)));
+  ++(*bitpointer);
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / PNG chunks                                                             / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+unsigned lodepng_chunk_length(const unsigned char* chunk) {
+  return lodepng_read32bitInt(&chunk[0]);
+}
+
+void lodepng_chunk_type(char type[5], const unsigned char* chunk) {
+  unsigned i;
+  for(i = 0; i != 4; ++i) type[i] = (char)chunk[4 + i];
+  type[4] = 0; /*null termination char*/
+}
+
+unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type) {
+  if(lodepng_strlen(type) != 4) return 0;
+  return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]);
+}
+
+unsigned char lodepng_chunk_ancillary(const unsigned char* chunk) {
+  return((chunk[4] & 32) != 0);
+}
+
+unsigned char lodepng_chunk_private(const unsigned char* chunk) {
+  return((chunk[6] & 32) != 0);
+}
+
+unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk) {
+  return((chunk[7] & 32) != 0);
+}
+
+unsigned char* lodepng_chunk_data(unsigned char* chunk) {
+  return &chunk[8];
+}
+
+const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk) {
+  return &chunk[8];
+}
+
+unsigned lodepng_chunk_check_crc(const unsigned char* chunk) {
+  unsigned length = lodepng_chunk_length(chunk);
+  unsigned CRC = lodepng_read32bitInt(&chunk[length + 8]);
+  /*the CRC is taken of the data and the 4 chunk type letters, not the length*/
+  unsigned checksum = lodepng_crc32(&chunk[4], length + 4);
+  if(CRC != checksum) return 1;
+  else return 0;
+}
+
+void lodepng_chunk_generate_crc(unsigned char* chunk) {
+  unsigned length = lodepng_chunk_length(chunk);
+  unsigned CRC = lodepng_crc32(&chunk[4], length + 4);
+  lodepng_set32bitInt(chunk + 8 + length, CRC);
+}
+
+unsigned char* lodepng_chunk_next(unsigned char* chunk, unsigned char* end) {
+  if(chunk >= end || end - chunk < 12) return end; /*too small to contain a chunk*/
+  if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47
+    && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) {
+    /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */
+    return chunk + 8;
+  } else {
+    size_t total_chunk_length;
+    unsigned char* result;
+    if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return end;
+    result = chunk + total_chunk_length;
+    if(result < chunk) return end; /*pointer overflow*/
+    return result;
+  }
+}
+
+const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk, const unsigned char* end) {
+  if(chunk >= end || end - chunk < 12) return end; /*too small to contain a chunk*/
+  if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47
+    && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) {
+    /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */
+    return chunk + 8;
+  } else {
+    size_t total_chunk_length;
+    const unsigned char* result;
+    if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return end;
+    result = chunk + total_chunk_length;
+    if(result < chunk) return end; /*pointer overflow*/
+    return result;
+  }
+}
+
+unsigned char* lodepng_chunk_find(unsigned char* chunk, unsigned char* end, const char type[5]) {
+  for(;;) {
+    if(chunk >= end || end - chunk < 12) return 0; /* past file end: chunk + 12 > end */
+    if(lodepng_chunk_type_equals(chunk, type)) return chunk;
+    chunk = lodepng_chunk_next(chunk, end);
+  }
+}
+
+const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]) {
+  for(;;) {
+    if(chunk >= end || end - chunk < 12) return 0; /* past file end: chunk + 12 > end */
+    if(lodepng_chunk_type_equals(chunk, type)) return chunk;
+    chunk = lodepng_chunk_next_const(chunk, end);
+  }
+}
+
+unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk) {
+  unsigned i;
+  size_t total_chunk_length, new_length;
+  unsigned char *chunk_start, *new_buffer;
+
+  if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return 77;
+  if(lodepng_addofl(*outsize, total_chunk_length, &new_length)) return 77;
+
+  new_buffer = (unsigned char*)lodepng_realloc(*out, new_length);
+  if(!new_buffer) return 83; /*alloc fail*/
+  (*out) = new_buffer;
+  (*outsize) = new_length;
+  chunk_start = &(*out)[new_length - total_chunk_length];
+
+  for(i = 0; i != total_chunk_length; ++i) chunk_start[i] = chunk[i];
+
+  return 0;
+}
+
+/*Sets length and name and allocates the space for data and crc but does not
+set data or crc yet. Returns the start of the chunk in chunk. The start of
+the data is at chunk + 8. To finalize chunk, add the data, then use
+lodepng_chunk_generate_crc */
+static unsigned lodepng_chunk_init(unsigned char** chunk,
+                                   ucvector* out,
+                                   unsigned length, const char* type) {
+  size_t new_length = out->size;
+  if(lodepng_addofl(new_length, length, &new_length)) return 77;
+  if(lodepng_addofl(new_length, 12, &new_length)) return 77;
+  if(!ucvector_resize(out, new_length)) return 83; /*alloc fail*/
+  *chunk = out->data + new_length - length - 12u;
+
+  /*1: length*/
+  lodepng_set32bitInt(*chunk, length);
+
+  /*2: chunk name (4 letters)*/
+  lodepng_memcpy(*chunk + 4, type, 4);
+
+  return 0;
+}
+
+/* like lodepng_chunk_create but with custom allocsize */
+static unsigned lodepng_chunk_createv(ucvector* out,
+                                      unsigned length, const char* type, const unsigned char* data) {
+  unsigned char* chunk;
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, length, type));
+
+  /*3: the data*/
+  lodepng_memcpy(chunk + 8, data, length);
+
+  /*4: CRC (of the chunkname characters and the data)*/
+  lodepng_chunk_generate_crc(chunk);
+
+  return 0;
+}
+
+unsigned lodepng_chunk_create(unsigned char** out, size_t* outsize,
+                              unsigned length, const char* type, const unsigned char* data) {
+  ucvector v = ucvector_init(*out, *outsize);
+  unsigned error = lodepng_chunk_createv(&v, length, type, data);
+  *out = v.data;
+  *outsize = v.size;
+  return error;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / Color types, channels, bits                                            / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*checks if the colortype is valid and the bitdepth bd is allowed for this colortype.
+Return value is a LodePNG error code.*/
+static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) {
+  switch(colortype) {
+    case LCT_GREY:       if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break;
+    case LCT_RGB:        if(!(                                 bd == 8 || bd == 16)) return 37; break;
+    case LCT_PALETTE:    if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8            )) return 37; break;
+    case LCT_GREY_ALPHA: if(!(                                 bd == 8 || bd == 16)) return 37; break;
+    case LCT_RGBA:       if(!(                                 bd == 8 || bd == 16)) return 37; break;
+    case LCT_MAX_OCTET_VALUE: return 31; /* invalid color type */
+    default: return 31; /* invalid color type */
+  }
+  return 0; /*allowed color type / bits combination*/
+}
+
+static unsigned getNumColorChannels(LodePNGColorType colortype) {
+  switch(colortype) {
+    case LCT_GREY: return 1;
+    case LCT_RGB: return 3;
+    case LCT_PALETTE: return 1;
+    case LCT_GREY_ALPHA: return 2;
+    case LCT_RGBA: return 4;
+    case LCT_MAX_OCTET_VALUE: return 0; /* invalid color type */
+    default: return 0; /*invalid color type*/
+  }
+}
+
+static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth) {
+  /*bits per pixel is amount of channels * bits per channel*/
+  return getNumColorChannels(colortype) * bitdepth;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+void lodepng_color_mode_init(LodePNGColorMode* info) {
+  info->key_defined = 0;
+  info->key_r = info->key_g = info->key_b = 0;
+  info->colortype = LCT_RGBA;
+  info->bitdepth = 8;
+  info->palette = 0;
+  info->palettesize = 0;
+}
+
+/*allocates palette memory if needed, and initializes all colors to black*/
+static void lodepng_color_mode_alloc_palette(LodePNGColorMode* info) {
+  size_t i;
+  /*if the palette is already allocated, it will have size 1024 so no reallocation needed in that case*/
+  /*the palette must have room for up to 256 colors with 4 bytes each.*/
+  if(!info->palette) info->palette = (unsigned char*)lodepng_malloc(1024);
+  if(!info->palette) return; /*alloc fail*/
+  for(i = 0; i != 256; ++i) {
+    /*Initialize all unused colors with black, the value used for invalid palette indices.
+    This is an error according to the PNG spec, but common PNG decoders make it black instead.
+    That makes color conversion slightly faster due to no error handling needed.*/
+    info->palette[i * 4 + 0] = 0;
+    info->palette[i * 4 + 1] = 0;
+    info->palette[i * 4 + 2] = 0;
+    info->palette[i * 4 + 3] = 255;
+  }
+}
+
+void lodepng_color_mode_cleanup(LodePNGColorMode* info) {
+  lodepng_palette_clear(info);
+}
+
+unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source) {
+  lodepng_color_mode_cleanup(dest);
+  lodepng_memcpy(dest, source, sizeof(LodePNGColorMode));
+  if(source->palette) {
+    dest->palette = (unsigned char*)lodepng_malloc(1024);
+    if(!dest->palette && source->palettesize) return 83; /*alloc fail*/
+    lodepng_memcpy(dest->palette, source->palette, source->palettesize * 4);
+  }
+  return 0;
+}
+
+LodePNGColorMode lodepng_color_mode_make(LodePNGColorType colortype, unsigned bitdepth) {
+  LodePNGColorMode result;
+  lodepng_color_mode_init(&result);
+  result.colortype = colortype;
+  result.bitdepth = bitdepth;
+  return result;
+}
+
+static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b) {
+  size_t i;
+  if(a->colortype != b->colortype) return 0;
+  if(a->bitdepth != b->bitdepth) return 0;
+  if(a->key_defined != b->key_defined) return 0;
+  if(a->key_defined) {
+    if(a->key_r != b->key_r) return 0;
+    if(a->key_g != b->key_g) return 0;
+    if(a->key_b != b->key_b) return 0;
+  }
+  if(a->palettesize != b->palettesize) return 0;
+  for(i = 0; i != a->palettesize * 4; ++i) {
+    if(a->palette[i] != b->palette[i]) return 0;
+  }
+  return 1;
+}
+
+void lodepng_palette_clear(LodePNGColorMode* info) {
+  if(info->palette) lodepng_free(info->palette);
+  info->palette = 0;
+  info->palettesize = 0;
+}
+
+unsigned lodepng_palette_add(LodePNGColorMode* info,
+                             unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
+  if(!info->palette) /*allocate palette if empty*/ {
+    lodepng_color_mode_alloc_palette(info);
+    if(!info->palette) return 83; /*alloc fail*/
+  }
+  if(info->palettesize >= 256) {
+    return 108; /*too many palette values*/
+  }
+  info->palette[4 * info->palettesize + 0] = r;
+  info->palette[4 * info->palettesize + 1] = g;
+  info->palette[4 * info->palettesize + 2] = b;
+  info->palette[4 * info->palettesize + 3] = a;
+  ++info->palettesize;
+  return 0;
+}
+
+/*calculate bits per pixel out of colortype and bitdepth*/
+unsigned lodepng_get_bpp(const LodePNGColorMode* info) {
+  return lodepng_get_bpp_lct(info->colortype, info->bitdepth);
+}
+
+unsigned lodepng_get_channels(const LodePNGColorMode* info) {
+  return getNumColorChannels(info->colortype);
+}
+
+unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info) {
+  return info->colortype == LCT_GREY || info->colortype == LCT_GREY_ALPHA;
+}
+
+unsigned lodepng_is_alpha_type(const LodePNGColorMode* info) {
+  return (info->colortype & 4) != 0; /*4 or 6*/
+}
+
+unsigned lodepng_is_palette_type(const LodePNGColorMode* info) {
+  return info->colortype == LCT_PALETTE;
+}
+
+unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info) {
+  size_t i;
+  for(i = 0; i != info->palettesize; ++i) {
+    if(info->palette[i * 4 + 3] < 255) return 1;
+  }
+  return 0;
+}
+
+unsigned lodepng_can_have_alpha(const LodePNGColorMode* info) {
+  return info->key_defined
+      || lodepng_is_alpha_type(info)
+      || lodepng_has_palette_alpha(info);
+}
+
+static size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) {
+  size_t bpp = lodepng_get_bpp_lct(colortype, bitdepth);
+  size_t n = (size_t)w * (size_t)h;
+  return ((n / 8u) * bpp) + ((n & 7u) * bpp + 7u) / 8u;
+}
+
+size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color) {
+  return lodepng_get_raw_size_lct(w, h, color->colortype, color->bitdepth);
+}
+
+
+#ifdef LODEPNG_COMPILE_PNG
+
+/*in an idat chunk, each scanline is a multiple of 8 bits, unlike the lodepng output buffer,
+and in addition has one extra byte per line: the filter byte. So this gives a larger
+result than lodepng_get_raw_size. Set h to 1 to get the size of 1 row including filter byte. */
+static size_t lodepng_get_raw_size_idat(unsigned w, unsigned h, unsigned bpp) {
+  /* + 1 for the filter byte, and possibly plus padding bits per line. */
+  /* Ignoring casts, the expression is equal to (w * bpp + 7) / 8 + 1, but avoids overflow of w * bpp */
+  size_t line = ((size_t)(w / 8u) * bpp) + 1u + ((w & 7u) * bpp + 7u) / 8u;
+  return (size_t)h * line;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Safely checks whether size_t overflow can be caused due to amount of pixels.
+This check is overcautious rather than precise. If this check indicates no overflow,
+you can safely compute in a size_t (but not an unsigned):
+-(size_t)w * (size_t)h * 8
+-amount of bytes in IDAT (including filter, padding and Adam7 bytes)
+-amount of bytes in raw color model
+Returns 1 if overflow possible, 0 if not.
+*/
+static int lodepng_pixel_overflow(unsigned w, unsigned h,
+                                  const LodePNGColorMode* pngcolor, const LodePNGColorMode* rawcolor) {
+  size_t bpp = LODEPNG_MAX(lodepng_get_bpp(pngcolor), lodepng_get_bpp(rawcolor));
+  size_t numpixels, total;
+  size_t line; /* bytes per line in worst case */
+
+  if(lodepng_mulofl((size_t)w, (size_t)h, &numpixels)) return 1;
+  if(lodepng_mulofl(numpixels, 8, &total)) return 1; /* bit pointer with 8-bit color, or 8 bytes per channel color */
+
+  /* Bytes per scanline with the expression "(w / 8u) * bpp) + ((w & 7u) * bpp + 7u) / 8u" */
+  if(lodepng_mulofl((size_t)(w / 8u), bpp, &line)) return 1;
+  if(lodepng_addofl(line, ((w & 7u) * bpp + 7u) / 8u, &line)) return 1;
+
+  if(lodepng_addofl(line, 5, &line)) return 1; /* 5 bytes overhead per line: 1 filterbyte, 4 for Adam7 worst case */
+  if(lodepng_mulofl(line, h, &total)) return 1; /* Total bytes in worst case */
+
+  return 0; /* no overflow */
+}
+#endif /*LODEPNG_COMPILE_DECODER*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+static void LodePNGUnknownChunks_init(LodePNGInfo* info) {
+  unsigned i;
+  for(i = 0; i != 3; ++i) info->unknown_chunks_data[i] = 0;
+  for(i = 0; i != 3; ++i) info->unknown_chunks_size[i] = 0;
+}
+
+static void LodePNGUnknownChunks_cleanup(LodePNGInfo* info) {
+  unsigned i;
+  for(i = 0; i != 3; ++i) lodepng_free(info->unknown_chunks_data[i]);
+}
+
+static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* src) {
+  unsigned i;
+
+  LodePNGUnknownChunks_cleanup(dest);
+
+  for(i = 0; i != 3; ++i) {
+    size_t j;
+    dest->unknown_chunks_size[i] = src->unknown_chunks_size[i];
+    dest->unknown_chunks_data[i] = (unsigned char*)lodepng_malloc(src->unknown_chunks_size[i]);
+    if(!dest->unknown_chunks_data[i] && dest->unknown_chunks_size[i]) return 83; /*alloc fail*/
+    for(j = 0; j < src->unknown_chunks_size[i]; ++j) {
+      dest->unknown_chunks_data[i][j] = src->unknown_chunks_data[i][j];
+    }
+  }
+
+  return 0;
+}
+
+/******************************************************************************/
+
+static void LodePNGText_init(LodePNGInfo* info) {
+  info->text_num = 0;
+  info->text_keys = NULL;
+  info->text_strings = NULL;
+}
+
+static void LodePNGText_cleanup(LodePNGInfo* info) {
+  size_t i;
+  for(i = 0; i != info->text_num; ++i) {
+    string_cleanup(&info->text_keys[i]);
+    string_cleanup(&info->text_strings[i]);
+  }
+  lodepng_free(info->text_keys);
+  lodepng_free(info->text_strings);
+}
+
+static unsigned LodePNGText_copy(LodePNGInfo* dest, const LodePNGInfo* source) {
+  size_t i = 0;
+  dest->text_keys = NULL;
+  dest->text_strings = NULL;
+  dest->text_num = 0;
+  for(i = 0; i != source->text_num; ++i) {
+    CERROR_TRY_RETURN(lodepng_add_text(dest, source->text_keys[i], source->text_strings[i]));
+  }
+  return 0;
+}
+
+static unsigned lodepng_add_text_sized(LodePNGInfo* info, const char* key, const char* str, size_t size) {
+  char** new_keys = (char**)(lodepng_realloc(info->text_keys, sizeof(char*) * (info->text_num + 1)));
+  char** new_strings = (char**)(lodepng_realloc(info->text_strings, sizeof(char*) * (info->text_num + 1)));
+
+  if(new_keys) info->text_keys = new_keys;
+  if(new_strings) info->text_strings = new_strings;
+
+  if(!new_keys || !new_strings) return 83; /*alloc fail*/
+
+  ++info->text_num;
+  info->text_keys[info->text_num - 1] = alloc_string(key);
+  info->text_strings[info->text_num - 1] = alloc_string_sized(str, size);
+  if(!info->text_keys[info->text_num - 1] || !info->text_strings[info->text_num - 1]) return 83; /*alloc fail*/
+
+  return 0;
+}
+
+unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str) {
+  return lodepng_add_text_sized(info, key, str, lodepng_strlen(str));
+}
+
+void lodepng_clear_text(LodePNGInfo* info) {
+  LodePNGText_cleanup(info);
+}
+
+/******************************************************************************/
+
+static void LodePNGIText_init(LodePNGInfo* info) {
+  info->itext_num = 0;
+  info->itext_keys = NULL;
+  info->itext_langtags = NULL;
+  info->itext_transkeys = NULL;
+  info->itext_strings = NULL;
+}
+
+static void LodePNGIText_cleanup(LodePNGInfo* info) {
+  size_t i;
+  for(i = 0; i != info->itext_num; ++i) {
+    string_cleanup(&info->itext_keys[i]);
+    string_cleanup(&info->itext_langtags[i]);
+    string_cleanup(&info->itext_transkeys[i]);
+    string_cleanup(&info->itext_strings[i]);
+  }
+  lodepng_free(info->itext_keys);
+  lodepng_free(info->itext_langtags);
+  lodepng_free(info->itext_transkeys);
+  lodepng_free(info->itext_strings);
+}
+
+static unsigned LodePNGIText_copy(LodePNGInfo* dest, const LodePNGInfo* source) {
+  size_t i = 0;
+  dest->itext_keys = NULL;
+  dest->itext_langtags = NULL;
+  dest->itext_transkeys = NULL;
+  dest->itext_strings = NULL;
+  dest->itext_num = 0;
+  for(i = 0; i != source->itext_num; ++i) {
+    CERROR_TRY_RETURN(lodepng_add_itext(dest, source->itext_keys[i], source->itext_langtags[i],
+                                        source->itext_transkeys[i], source->itext_strings[i]));
+  }
+  return 0;
+}
+
+void lodepng_clear_itext(LodePNGInfo* info) {
+  LodePNGIText_cleanup(info);
+}
+
+static unsigned lodepng_add_itext_sized(LodePNGInfo* info, const char* key, const char* langtag,
+                                        const char* transkey, const char* str, size_t size) {
+  char** new_keys = (char**)(lodepng_realloc(info->itext_keys, sizeof(char*) * (info->itext_num + 1)));
+  char** new_langtags = (char**)(lodepng_realloc(info->itext_langtags, sizeof(char*) * (info->itext_num + 1)));
+  char** new_transkeys = (char**)(lodepng_realloc(info->itext_transkeys, sizeof(char*) * (info->itext_num + 1)));
+  char** new_strings = (char**)(lodepng_realloc(info->itext_strings, sizeof(char*) * (info->itext_num + 1)));
+
+  if(new_keys) info->itext_keys = new_keys;
+  if(new_langtags) info->itext_langtags = new_langtags;
+  if(new_transkeys) info->itext_transkeys = new_transkeys;
+  if(new_strings) info->itext_strings = new_strings;
+
+  if(!new_keys || !new_langtags || !new_transkeys || !new_strings) return 83; /*alloc fail*/
+
+  ++info->itext_num;
+
+  info->itext_keys[info->itext_num - 1] = alloc_string(key);
+  info->itext_langtags[info->itext_num - 1] = alloc_string(langtag);
+  info->itext_transkeys[info->itext_num - 1] = alloc_string(transkey);
+  info->itext_strings[info->itext_num - 1] = alloc_string_sized(str, size);
+
+  return 0;
+}
+
+unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag,
+                           const char* transkey, const char* str) {
+  return lodepng_add_itext_sized(info, key, langtag, transkey, str, lodepng_strlen(str));
+}
+
+/* same as set but does not delete */
+static unsigned lodepng_assign_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size) {
+  if(profile_size == 0) return 100; /*invalid ICC profile size*/
+
+  info->iccp_name = alloc_string(name);
+  info->iccp_profile = (unsigned char*)lodepng_malloc(profile_size);
+
+  if(!info->iccp_name || !info->iccp_profile) return 83; /*alloc fail*/
+
+  lodepng_memcpy(info->iccp_profile, profile, profile_size);
+  info->iccp_profile_size = profile_size;
+
+  return 0; /*ok*/
+}
+
+unsigned lodepng_set_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size) {
+  if(info->iccp_name) lodepng_clear_icc(info);
+  info->iccp_defined = 1;
+
+  return lodepng_assign_icc(info, name, profile, profile_size);
+}
+
+void lodepng_clear_icc(LodePNGInfo* info) {
+  string_cleanup(&info->iccp_name);
+  lodepng_free(info->iccp_profile);
+  info->iccp_profile = NULL;
+  info->iccp_profile_size = 0;
+  info->iccp_defined = 0;
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+void lodepng_info_init(LodePNGInfo* info) {
+  lodepng_color_mode_init(&info->color);
+  info->interlace_method = 0;
+  info->compression_method = 0;
+  info->filter_method = 0;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  info->background_defined = 0;
+  info->background_r = info->background_g = info->background_b = 0;
+
+  LodePNGText_init(info);
+  LodePNGIText_init(info);
+
+  info->time_defined = 0;
+  info->phys_defined = 0;
+
+  info->gama_defined = 0;
+  info->chrm_defined = 0;
+  info->srgb_defined = 0;
+  info->iccp_defined = 0;
+  info->iccp_name = NULL;
+  info->iccp_profile = NULL;
+
+  LodePNGUnknownChunks_init(info);
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+}
+
+void lodepng_info_cleanup(LodePNGInfo* info) {
+  lodepng_color_mode_cleanup(&info->color);
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  LodePNGText_cleanup(info);
+  LodePNGIText_cleanup(info);
+
+  lodepng_clear_icc(info);
+
+  LodePNGUnknownChunks_cleanup(info);
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+}
+
+unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) {
+  lodepng_info_cleanup(dest);
+  lodepng_memcpy(dest, source, sizeof(LodePNGInfo));
+  lodepng_color_mode_init(&dest->color);
+  CERROR_TRY_RETURN(lodepng_color_mode_copy(&dest->color, &source->color));
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  CERROR_TRY_RETURN(LodePNGText_copy(dest, source));
+  CERROR_TRY_RETURN(LodePNGIText_copy(dest, source));
+  if(source->iccp_defined) {
+    CERROR_TRY_RETURN(lodepng_assign_icc(dest, source->iccp_name, source->iccp_profile, source->iccp_profile_size));
+  }
+
+  LodePNGUnknownChunks_init(dest);
+  CERROR_TRY_RETURN(LodePNGUnknownChunks_copy(dest, source));
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  return 0;
+}
+
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to*/
+static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in) {
+  unsigned m = bits == 1 ? 7 : bits == 2 ? 3 : 1; /*8 / bits - 1*/
+  /*p = the partial index in the byte, e.g. with 4 palettebits it is 0 for first half or 1 for second half*/
+  unsigned p = index & m;
+  in &= (1u << bits) - 1u; /*filter out any other bits of the input value*/
+  in = in << (bits * (m - p));
+  if(p == 0) out[index * bits / 8u] = in;
+  else out[index * bits / 8u] |= in;
+}
+
+typedef struct ColorTree ColorTree;
+
+/*
+One node of a color tree
+This is the data structure used to count the number of unique colors and to get a palette
+index for a color. It's like an octree, but because the alpha channel is used too, each
+node has 16 instead of 8 children.
+*/
+struct ColorTree {
+  ColorTree* children[16]; /*up to 16 pointers to ColorTree of next level*/
+  int index; /*the payload. Only has a meaningful value if this is in the last level*/
+};
+
+static void color_tree_init(ColorTree* tree) {
+  lodepng_memset(tree->children, 0, 16 * sizeof(*tree->children));
+  tree->index = -1;
+}
+
+static void color_tree_cleanup(ColorTree* tree) {
+  int i;
+  for(i = 0; i != 16; ++i) {
+    if(tree->children[i]) {
+      color_tree_cleanup(tree->children[i]);
+      lodepng_free(tree->children[i]);
+    }
+  }
+}
+
+/*returns -1 if color not present, its index otherwise*/
+static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
+  int bit = 0;
+  for(bit = 0; bit < 8; ++bit) {
+    int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1);
+    if(!tree->children[i]) return -1;
+    else tree = tree->children[i];
+  }
+  return tree ? tree->index : -1;
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
+  return color_tree_get(tree, r, g, b, a) >= 0;
+}
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*color is not allowed to already exist.
+Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist")
+Returns error code, or 0 if ok*/
+static unsigned color_tree_add(ColorTree* tree,
+                               unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned index) {
+  int bit;
+  for(bit = 0; bit < 8; ++bit) {
+    int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1);
+    if(!tree->children[i]) {
+      tree->children[i] = (ColorTree*)lodepng_malloc(sizeof(ColorTree));
+      if(!tree->children[i]) return 83; /*alloc fail*/
+      color_tree_init(tree->children[i]);
+    }
+    tree = tree->children[i];
+  }
+  tree->index = (int)index;
+  return 0;
+}
+
+/*put a pixel, given its RGBA color, into image of any color type*/
+static unsigned rgba8ToPixel(unsigned char* out, size_t i,
+                             const LodePNGColorMode* mode, ColorTree* tree /*for palette*/,
+                             unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
+  if(mode->colortype == LCT_GREY) {
+    unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/
+    if(mode->bitdepth == 8) out[i] = gray;
+    else if(mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = gray;
+    else {
+      /*take the most significant bits of gray*/
+      gray = ((unsigned)gray >> (8u - mode->bitdepth)) & ((1u << mode->bitdepth) - 1u);
+      addColorBits(out, i, mode->bitdepth, gray);
+    }
+  } else if(mode->colortype == LCT_RGB) {
+    if(mode->bitdepth == 8) {
+      out[i * 3 + 0] = r;
+      out[i * 3 + 1] = g;
+      out[i * 3 + 2] = b;
+    } else {
+      out[i * 6 + 0] = out[i * 6 + 1] = r;
+      out[i * 6 + 2] = out[i * 6 + 3] = g;
+      out[i * 6 + 4] = out[i * 6 + 5] = b;
+    }
+  } else if(mode->colortype == LCT_PALETTE) {
+    int index = color_tree_get(tree, r, g, b, a);
+    if(index < 0) return 82; /*color not in palette*/
+    if(mode->bitdepth == 8) out[i] = index;
+    else addColorBits(out, i, mode->bitdepth, (unsigned)index);
+  } else if(mode->colortype == LCT_GREY_ALPHA) {
+    unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/
+    if(mode->bitdepth == 8) {
+      out[i * 2 + 0] = gray;
+      out[i * 2 + 1] = a;
+    } else if(mode->bitdepth == 16) {
+      out[i * 4 + 0] = out[i * 4 + 1] = gray;
+      out[i * 4 + 2] = out[i * 4 + 3] = a;
+    }
+  } else if(mode->colortype == LCT_RGBA) {
+    if(mode->bitdepth == 8) {
+      out[i * 4 + 0] = r;
+      out[i * 4 + 1] = g;
+      out[i * 4 + 2] = b;
+      out[i * 4 + 3] = a;
+    } else {
+      out[i * 8 + 0] = out[i * 8 + 1] = r;
+      out[i * 8 + 2] = out[i * 8 + 3] = g;
+      out[i * 8 + 4] = out[i * 8 + 5] = b;
+      out[i * 8 + 6] = out[i * 8 + 7] = a;
+    }
+  }
+
+  return 0; /*no error*/
+}
+
+/*put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type*/
+static void rgba16ToPixel(unsigned char* out, size_t i,
+                         const LodePNGColorMode* mode,
+                         unsigned short r, unsigned short g, unsigned short b, unsigned short a) {
+  if(mode->colortype == LCT_GREY) {
+    unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/
+    out[i * 2 + 0] = (gray >> 8) & 255;
+    out[i * 2 + 1] = gray & 255;
+  } else if(mode->colortype == LCT_RGB) {
+    out[i * 6 + 0] = (r >> 8) & 255;
+    out[i * 6 + 1] = r & 255;
+    out[i * 6 + 2] = (g >> 8) & 255;
+    out[i * 6 + 3] = g & 255;
+    out[i * 6 + 4] = (b >> 8) & 255;
+    out[i * 6 + 5] = b & 255;
+  } else if(mode->colortype == LCT_GREY_ALPHA) {
+    unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/
+    out[i * 4 + 0] = (gray >> 8) & 255;
+    out[i * 4 + 1] = gray & 255;
+    out[i * 4 + 2] = (a >> 8) & 255;
+    out[i * 4 + 3] = a & 255;
+  } else if(mode->colortype == LCT_RGBA) {
+    out[i * 8 + 0] = (r >> 8) & 255;
+    out[i * 8 + 1] = r & 255;
+    out[i * 8 + 2] = (g >> 8) & 255;
+    out[i * 8 + 3] = g & 255;
+    out[i * 8 + 4] = (b >> 8) & 255;
+    out[i * 8 + 5] = b & 255;
+    out[i * 8 + 6] = (a >> 8) & 255;
+    out[i * 8 + 7] = a & 255;
+  }
+}
+
+/*Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/
+static void getPixelColorRGBA8(unsigned char* r, unsigned char* g,
+                               unsigned char* b, unsigned char* a,
+                               const unsigned char* in, size_t i,
+                               const LodePNGColorMode* mode) {
+  if(mode->colortype == LCT_GREY) {
+    if(mode->bitdepth == 8) {
+      *r = *g = *b = in[i];
+      if(mode->key_defined && *r == mode->key_r) *a = 0;
+      else *a = 255;
+    } else if(mode->bitdepth == 16) {
+      *r = *g = *b = in[i * 2 + 0];
+      if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0;
+      else *a = 255;
+    } else {
+      unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/
+      size_t j = i * mode->bitdepth;
+      unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth);
+      *r = *g = *b = (value * 255) / highest;
+      if(mode->key_defined && value == mode->key_r) *a = 0;
+      else *a = 255;
+    }
+  } else if(mode->colortype == LCT_RGB) {
+    if(mode->bitdepth == 8) {
+      *r = in[i * 3 + 0]; *g = in[i * 3 + 1]; *b = in[i * 3 + 2];
+      if(mode->key_defined && *r == mode->key_r && *g == mode->key_g && *b == mode->key_b) *a = 0;
+      else *a = 255;
+    } else {
+      *r = in[i * 6 + 0];
+      *g = in[i * 6 + 2];
+      *b = in[i * 6 + 4];
+      if(mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r
+         && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g
+         && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0;
+      else *a = 255;
+    }
+  } else if(mode->colortype == LCT_PALETTE) {
+    unsigned index;
+    if(mode->bitdepth == 8) index = in[i];
+    else {
+      size_t j = i * mode->bitdepth;
+      index = readBitsFromReversedStream(&j, in, mode->bitdepth);
+    }
+    /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/
+    *r = mode->palette[index * 4 + 0];
+    *g = mode->palette[index * 4 + 1];
+    *b = mode->palette[index * 4 + 2];
+    *a = mode->palette[index * 4 + 3];
+  } else if(mode->colortype == LCT_GREY_ALPHA) {
+    if(mode->bitdepth == 8) {
+      *r = *g = *b = in[i * 2 + 0];
+      *a = in[i * 2 + 1];
+    } else {
+      *r = *g = *b = in[i * 4 + 0];
+      *a = in[i * 4 + 2];
+    }
+  } else if(mode->colortype == LCT_RGBA) {
+    if(mode->bitdepth == 8) {
+      *r = in[i * 4 + 0];
+      *g = in[i * 4 + 1];
+      *b = in[i * 4 + 2];
+      *a = in[i * 4 + 3];
+    } else {
+      *r = in[i * 8 + 0];
+      *g = in[i * 8 + 2];
+      *b = in[i * 8 + 4];
+      *a = in[i * 8 + 6];
+    }
+  }
+}
+
+/*Similar to getPixelColorRGBA8, but with all the for loops inside of the color
+mode test cases, optimized to convert the colors much faster, when converting
+to the common case of RGBA with 8 bit per channel. buffer must be RGBA with
+enough memory.*/
+static void getPixelColorsRGBA8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels,
+                                const unsigned char* LODEPNG_RESTRICT in,
+                                const LodePNGColorMode* mode) {
+  unsigned num_channels = 4;
+  size_t i;
+  if(mode->colortype == LCT_GREY) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i];
+        buffer[3] = 255;
+      }
+      if(mode->key_defined) {
+        buffer -= numpixels * num_channels;
+        for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+          if(buffer[0] == mode->key_r) buffer[3] = 0;
+        }
+      }
+    } else if(mode->bitdepth == 16) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i * 2];
+        buffer[3] = mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r ? 0 : 255;
+      }
+    } else {
+      unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/
+      size_t j = 0;
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth);
+        buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest;
+        buffer[3] = mode->key_defined && value == mode->key_r ? 0 : 255;
+      }
+    }
+  } else if(mode->colortype == LCT_RGB) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        lodepng_memcpy(buffer, &in[i * 3], 3);
+        buffer[3] = 255;
+      }
+      if(mode->key_defined) {
+        buffer -= numpixels * num_channels;
+        for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+          if(buffer[0] == mode->key_r && buffer[1]== mode->key_g && buffer[2] == mode->key_b) buffer[3] = 0;
+        }
+      }
+    } else {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = in[i * 6 + 0];
+        buffer[1] = in[i * 6 + 2];
+        buffer[2] = in[i * 6 + 4];
+        buffer[3] = mode->key_defined
+           && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r
+           && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g
+           && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b ? 0 : 255;
+      }
+    }
+  } else if(mode->colortype == LCT_PALETTE) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        unsigned index = in[i];
+        /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/
+        lodepng_memcpy(buffer, &mode->palette[index * 4], 4);
+      }
+    } else {
+      size_t j = 0;
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth);
+        /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/
+        lodepng_memcpy(buffer, &mode->palette[index * 4], 4);
+      }
+    }
+  } else if(mode->colortype == LCT_GREY_ALPHA) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0];
+        buffer[3] = in[i * 2 + 1];
+      }
+    } else {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0];
+        buffer[3] = in[i * 4 + 2];
+      }
+    }
+  } else if(mode->colortype == LCT_RGBA) {
+    if(mode->bitdepth == 8) {
+      lodepng_memcpy(buffer, in, numpixels * 4);
+    } else {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = in[i * 8 + 0];
+        buffer[1] = in[i * 8 + 2];
+        buffer[2] = in[i * 8 + 4];
+        buffer[3] = in[i * 8 + 6];
+      }
+    }
+  }
+}
+
+/*Similar to getPixelColorsRGBA8, but with 3-channel RGB output.*/
+static void getPixelColorsRGB8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels,
+                               const unsigned char* LODEPNG_RESTRICT in,
+                               const LodePNGColorMode* mode) {
+  const unsigned num_channels = 3;
+  size_t i;
+  if(mode->colortype == LCT_GREY) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i];
+      }
+    } else if(mode->bitdepth == 16) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i * 2];
+      }
+    } else {
+      unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/
+      size_t j = 0;
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth);
+        buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest;
+      }
+    }
+  } else if(mode->colortype == LCT_RGB) {
+    if(mode->bitdepth == 8) {
+      lodepng_memcpy(buffer, in, numpixels * 3);
+    } else {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = in[i * 6 + 0];
+        buffer[1] = in[i * 6 + 2];
+        buffer[2] = in[i * 6 + 4];
+      }
+    }
+  } else if(mode->colortype == LCT_PALETTE) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        unsigned index = in[i];
+        /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/
+        lodepng_memcpy(buffer, &mode->palette[index * 4], 3);
+      }
+    } else {
+      size_t j = 0;
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth);
+        /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/
+        lodepng_memcpy(buffer, &mode->palette[index * 4], 3);
+      }
+    }
+  } else if(mode->colortype == LCT_GREY_ALPHA) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0];
+      }
+    } else {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0];
+      }
+    }
+  } else if(mode->colortype == LCT_RGBA) {
+    if(mode->bitdepth == 8) {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        lodepng_memcpy(buffer, &in[i * 4], 3);
+      }
+    } else {
+      for(i = 0; i != numpixels; ++i, buffer += num_channels) {
+        buffer[0] = in[i * 8 + 0];
+        buffer[1] = in[i * 8 + 2];
+        buffer[2] = in[i * 8 + 4];
+      }
+    }
+  }
+}
+
+/*Get RGBA16 color of pixel with index i (y * width + x) from the raw image with
+given color type, but the given color type must be 16-bit itself.*/
+static void getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned short* b, unsigned short* a,
+                                const unsigned char* in, size_t i, const LodePNGColorMode* mode) {
+  if(mode->colortype == LCT_GREY) {
+    *r = *g = *b = 256 * in[i * 2 + 0] + in[i * 2 + 1];
+    if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0;
+    else *a = 65535;
+  } else if(mode->colortype == LCT_RGB) {
+    *r = 256u * in[i * 6 + 0] + in[i * 6 + 1];
+    *g = 256u * in[i * 6 + 2] + in[i * 6 + 3];
+    *b = 256u * in[i * 6 + 4] + in[i * 6 + 5];
+    if(mode->key_defined
+       && 256u * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r
+       && 256u * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g
+       && 256u * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0;
+    else *a = 65535;
+  } else if(mode->colortype == LCT_GREY_ALPHA) {
+    *r = *g = *b = 256u * in[i * 4 + 0] + in[i * 4 + 1];
+    *a = 256u * in[i * 4 + 2] + in[i * 4 + 3];
+  } else if(mode->colortype == LCT_RGBA) {
+    *r = 256u * in[i * 8 + 0] + in[i * 8 + 1];
+    *g = 256u * in[i * 8 + 2] + in[i * 8 + 3];
+    *b = 256u * in[i * 8 + 4] + in[i * 8 + 5];
+    *a = 256u * in[i * 8 + 6] + in[i * 8 + 7];
+  }
+}
+
+unsigned lodepng_convert(unsigned char* out, const unsigned char* in,
+                         const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in,
+                         unsigned w, unsigned h) {
+  size_t i;
+  ColorTree tree;
+  size_t numpixels = (size_t)w * (size_t)h;
+  unsigned error = 0;
+
+  if(mode_in->colortype == LCT_PALETTE && !mode_in->palette) {
+    return 107; /* error: must provide palette if input mode is palette */
+  }
+
+  if(lodepng_color_mode_equal(mode_out, mode_in)) {
+    size_t numbytes = lodepng_get_raw_size(w, h, mode_in);
+    lodepng_memcpy(out, in, numbytes);
+    return 0;
+  }
+
+  if(mode_out->colortype == LCT_PALETTE) {
+    size_t palettesize = mode_out->palettesize;
+    const unsigned char* palette = mode_out->palette;
+    size_t palsize = (size_t)1u << mode_out->bitdepth;
+    /*if the user specified output palette but did not give the values, assume
+    they want the values of the input color type (assuming that one is palette).
+    Note that we never create a new palette ourselves.*/
+    if(palettesize == 0) {
+      palettesize = mode_in->palettesize;
+      palette = mode_in->palette;
+      /*if the input was also palette with same bitdepth, then the color types are also
+      equal, so copy literally. This to preserve the exact indices that were in the PNG
+      even in case there are duplicate colors in the palette.*/
+      if(mode_in->colortype == LCT_PALETTE && mode_in->bitdepth == mode_out->bitdepth) {
+        size_t numbytes = lodepng_get_raw_size(w, h, mode_in);
+        lodepng_memcpy(out, in, numbytes);
+        return 0;
+      }
+    }
+    if(palettesize < palsize) palsize = palettesize;
+    color_tree_init(&tree);
+    for(i = 0; i != palsize; ++i) {
+      const unsigned char* p = &palette[i * 4];
+      error = color_tree_add(&tree, p[0], p[1], p[2], p[3], (unsigned)i);
+      if(error) break;
+    }
+  }
+
+  if(!error) {
+    if(mode_in->bitdepth == 16 && mode_out->bitdepth == 16) {
+      for(i = 0; i != numpixels; ++i) {
+        unsigned short r = 0, g = 0, b = 0, a = 0;
+        getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in);
+        rgba16ToPixel(out, i, mode_out, r, g, b, a);
+      }
+    } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGBA) {
+      getPixelColorsRGBA8(out, numpixels, in, mode_in);
+    } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGB) {
+      getPixelColorsRGB8(out, numpixels, in, mode_in);
+    } else {
+      unsigned char r = 0, g = 0, b = 0, a = 0;
+      for(i = 0; i != numpixels; ++i) {
+        getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in);
+        error = rgba8ToPixel(out, i, mode_out, &tree, r, g, b, a);
+        if(error) break;
+      }
+    }
+  }
+
+  if(mode_out->colortype == LCT_PALETTE) {
+    color_tree_cleanup(&tree);
+  }
+
+  return error;
+}
+
+
+/* Converts a single rgb color without alpha from one type to another, color bits truncated to
+their bitdepth. In case of single channel (gray or palette), only the r channel is used. Slow
+function, do not use to process all pixels of an image. Alpha channel not supported on purpose:
+this is for bKGD, supporting alpha may prevent it from finding a color in the palette, from the
+specification it looks like bKGD should ignore the alpha values of the palette since it can use
+any palette index but doesn't have an alpha channel. Idem with ignoring color key. */
+unsigned lodepng_convert_rgb(
+    unsigned* r_out, unsigned* g_out, unsigned* b_out,
+    unsigned r_in, unsigned g_in, unsigned b_in,
+    const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in) {
+  unsigned r = 0, g = 0, b = 0;
+  unsigned mul = 65535 / ((1u << mode_in->bitdepth) - 1u); /*65535, 21845, 4369, 257, 1*/
+  unsigned shift = 16 - mode_out->bitdepth;
+
+  if(mode_in->colortype == LCT_GREY || mode_in->colortype == LCT_GREY_ALPHA) {
+    r = g = b = r_in * mul;
+  } else if(mode_in->colortype == LCT_RGB || mode_in->colortype == LCT_RGBA) {
+    r = r_in * mul;
+    g = g_in * mul;
+    b = b_in * mul;
+  } else if(mode_in->colortype == LCT_PALETTE) {
+    if(r_in >= mode_in->palettesize) return 82;
+    r = mode_in->palette[r_in * 4 + 0] * 257u;
+    g = mode_in->palette[r_in * 4 + 1] * 257u;
+    b = mode_in->palette[r_in * 4 + 2] * 257u;
+  } else {
+    return 31;
+  }
+
+  /* now convert to output format */
+  if(mode_out->colortype == LCT_GREY || mode_out->colortype == LCT_GREY_ALPHA) {
+    *r_out = r >> shift ;
+  } else if(mode_out->colortype == LCT_RGB || mode_out->colortype == LCT_RGBA) {
+    *r_out = r >> shift ;
+    *g_out = g >> shift ;
+    *b_out = b >> shift ;
+  } else if(mode_out->colortype == LCT_PALETTE) {
+    unsigned i;
+    /* a 16-bit color cannot be in the palette */
+    if((r >> 8) != (r & 255) || (g >> 8) != (g & 255) || (b >> 8) != (b & 255)) return 82;
+    for(i = 0; i < mode_out->palettesize; i++) {
+      unsigned j = i * 4;
+      if((r >> 8) == mode_out->palette[j + 0] && (g >> 8) == mode_out->palette[j + 1] &&
+          (b >> 8) == mode_out->palette[j + 2]) {
+        *r_out = i;
+        return 0;
+      }
+    }
+    return 82;
+  } else {
+    return 31;
+  }
+
+  return 0;
+}
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+void lodepng_color_stats_init(LodePNGColorStats* stats) {
+  /*stats*/
+  stats->colored = 0;
+  stats->key = 0;
+  stats->key_r = stats->key_g = stats->key_b = 0;
+  stats->alpha = 0;
+  stats->numcolors = 0;
+  stats->bits = 1;
+  stats->numpixels = 0;
+  /*settings*/
+  stats->allow_palette = 1;
+  stats->allow_greyscale = 1;
+}
+
+/*function used for debug purposes with C++*/
+/*void printColorStats(LodePNGColorStats* p) {
+  std::cout << "colored: " << (int)p->colored << ", ";
+  std::cout << "key: " << (int)p->key << ", ";
+  std::cout << "key_r: " << (int)p->key_r << ", ";
+  std::cout << "key_g: " << (int)p->key_g << ", ";
+  std::cout << "key_b: " << (int)p->key_b << ", ";
+  std::cout << "alpha: " << (int)p->alpha << ", ";
+  std::cout << "numcolors: " << (int)p->numcolors << ", ";
+  std::cout << "bits: " << (int)p->bits << std::endl;
+}*/
+
+/*Returns how many bits needed to represent given value (max 8 bit)*/
+static unsigned getValueRequiredBits(unsigned char value) {
+  if(value == 0 || value == 255) return 1;
+  /*The scaling of 2-bit and 4-bit values uses multiples of 85 and 17*/
+  if(value % 17 == 0) return value % 85 == 0 ? 2 : 4;
+  return 8;
+}
+
+/*stats must already have been inited. */
+unsigned lodepng_compute_color_stats(LodePNGColorStats* stats,
+                                     const unsigned char* in, unsigned w, unsigned h,
+                                     const LodePNGColorMode* mode_in) {
+  size_t i;
+  ColorTree tree;
+  size_t numpixels = (size_t)w * (size_t)h;
+  unsigned error = 0;
+
+  /* mark things as done already if it would be impossible to have a more expensive case */
+  unsigned colored_done = lodepng_is_greyscale_type(mode_in) ? 1 : 0;
+  unsigned alpha_done = lodepng_can_have_alpha(mode_in) ? 0 : 1;
+  unsigned numcolors_done = 0;
+  unsigned bpp = lodepng_get_bpp(mode_in);
+  unsigned bits_done = (stats->bits == 1 && bpp == 1) ? 1 : 0;
+  unsigned sixteen = 0; /* whether the input image is 16 bit */
+  unsigned maxnumcolors = 257;
+  if(bpp <= 8) maxnumcolors = LODEPNG_MIN(257, stats->numcolors + (1u << bpp));
+
+  stats->numpixels += numpixels;
+
+  /*if palette not allowed, no need to compute numcolors*/
+  if(!stats->allow_palette) numcolors_done = 1;
+
+  color_tree_init(&tree);
+
+  /*If the stats was already filled in from previous data, fill its palette in tree
+  and mark things as done already if we know they are the most expensive case already*/
+  if(stats->alpha) alpha_done = 1;
+  if(stats->colored) colored_done = 1;
+  if(stats->bits == 16) numcolors_done = 1;
+  if(stats->bits >= bpp) bits_done = 1;
+  if(stats->numcolors >= maxnumcolors) numcolors_done = 1;
+
+  if(!numcolors_done) {
+    for(i = 0; i < stats->numcolors; i++) {
+      const unsigned char* color = &stats->palette[i * 4];
+      error = color_tree_add(&tree, color[0], color[1], color[2], color[3], i);
+      if(error) goto cleanup;
+    }
+  }
+
+  /*Check if the 16-bit input is truly 16-bit*/
+  if(mode_in->bitdepth == 16 && !sixteen) {
+    unsigned short r = 0, g = 0, b = 0, a = 0;
+    for(i = 0; i != numpixels; ++i) {
+      getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in);
+      if((r & 255) != ((r >> 8) & 255) || (g & 255) != ((g >> 8) & 255) ||
+         (b & 255) != ((b >> 8) & 255) || (a & 255) != ((a >> 8) & 255)) /*first and second byte differ*/ {
+        stats->bits = 16;
+        sixteen = 1;
+        bits_done = 1;
+        numcolors_done = 1; /*counting colors no longer useful, palette doesn't support 16-bit*/
+        break;
+      }
+    }
+  }
+
+  if(sixteen) {
+    unsigned short r = 0, g = 0, b = 0, a = 0;
+
+    for(i = 0; i != numpixels; ++i) {
+      getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in);
+
+      if(!colored_done && (r != g || r != b)) {
+        stats->colored = 1;
+        colored_done = 1;
+      }
+
+      if(!alpha_done) {
+        unsigned matchkey = (r == stats->key_r && g == stats->key_g && b == stats->key_b);
+        if(a != 65535 && (a != 0 || (stats->key && !matchkey))) {
+          stats->alpha = 1;
+          stats->key = 0;
+          alpha_done = 1;
+        } else if(a == 0 && !stats->alpha && !stats->key) {
+          stats->key = 1;
+          stats->key_r = r;
+          stats->key_g = g;
+          stats->key_b = b;
+        } else if(a == 65535 && stats->key && matchkey) {
+          /* Color key cannot be used if an opaque pixel also has that RGB color. */
+          stats->alpha = 1;
+          stats->key = 0;
+          alpha_done = 1;
+        }
+      }
+      if(alpha_done && numcolors_done && colored_done && bits_done) break;
+    }
+
+    if(stats->key && !stats->alpha) {
+      for(i = 0; i != numpixels; ++i) {
+        getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in);
+        if(a != 0 && r == stats->key_r && g == stats->key_g && b == stats->key_b) {
+          /* Color key cannot be used if an opaque pixel also has that RGB color. */
+          stats->alpha = 1;
+          stats->key = 0;
+          alpha_done = 1;
+        }
+      }
+    }
+  } else /* < 16-bit */ {
+    unsigned char r = 0, g = 0, b = 0, a = 0;
+    for(i = 0; i != numpixels; ++i) {
+      getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in);
+
+      if(!bits_done && stats->bits < 8) {
+        /*only r is checked, < 8 bits is only relevant for grayscale*/
+        unsigned bits = getValueRequiredBits(r);
+        if(bits > stats->bits) stats->bits = bits;
+      }
+      bits_done = (stats->bits >= bpp);
+
+      if(!colored_done && (r != g || r != b)) {
+        stats->colored = 1;
+        colored_done = 1;
+        if(stats->bits < 8) stats->bits = 8; /*PNG has no colored modes with less than 8-bit per channel*/
+      }
+
+      if(!alpha_done) {
+        unsigned matchkey = (r == stats->key_r && g == stats->key_g && b == stats->key_b);
+        if(a != 255 && (a != 0 || (stats->key && !matchkey))) {
+          stats->alpha = 1;
+          stats->key = 0;
+          alpha_done = 1;
+          if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/
+        } else if(a == 0 && !stats->alpha && !stats->key) {
+          stats->key = 1;
+          stats->key_r = r;
+          stats->key_g = g;
+          stats->key_b = b;
+        } else if(a == 255 && stats->key && matchkey) {
+          /* Color key cannot be used if an opaque pixel also has that RGB color. */
+          stats->alpha = 1;
+          stats->key = 0;
+          alpha_done = 1;
+          if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/
+        }
+      }
+
+      if(!numcolors_done) {
+        if(!color_tree_has(&tree, r, g, b, a)) {
+          error = color_tree_add(&tree, r, g, b, a, stats->numcolors);
+          if(error) goto cleanup;
+          if(stats->numcolors < 256) {
+            unsigned char* p = stats->palette;
+            unsigned n = stats->numcolors;
+            p[n * 4 + 0] = r;
+            p[n * 4 + 1] = g;
+            p[n * 4 + 2] = b;
+            p[n * 4 + 3] = a;
+          }
+          ++stats->numcolors;
+          numcolors_done = stats->numcolors >= maxnumcolors;
+        }
+      }
+
+      if(alpha_done && numcolors_done && colored_done && bits_done) break;
+    }
+
+    if(stats->key && !stats->alpha) {
+      for(i = 0; i != numpixels; ++i) {
+        getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in);
+        if(a != 0 && r == stats->key_r && g == stats->key_g && b == stats->key_b) {
+          /* Color key cannot be used if an opaque pixel also has that RGB color. */
+          stats->alpha = 1;
+          stats->key = 0;
+          alpha_done = 1;
+          if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/
+        }
+      }
+    }
+
+    /*make the stats's key always 16-bit for consistency - repeat each byte twice*/
+    stats->key_r += (stats->key_r << 8);
+    stats->key_g += (stats->key_g << 8);
+    stats->key_b += (stats->key_b << 8);
+  }
+
+cleanup:
+  color_tree_cleanup(&tree);
+  return error;
+}
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*Adds a single color to the color stats. The stats must already have been inited. The color must be given as 16-bit
+(with 2 bytes repeating for 8-bit and 65535 for opaque alpha channel). This function is expensive, do not call it for
+all pixels of an image but only for a few additional values. */
+static unsigned lodepng_color_stats_add(LodePNGColorStats* stats,
+                                        unsigned r, unsigned g, unsigned b, unsigned a) {
+  unsigned error = 0;
+  unsigned char image[8];
+  LodePNGColorMode mode;
+  lodepng_color_mode_init(&mode);
+  image[0] = r >> 8; image[1] = r; image[2] = g >> 8; image[3] = g;
+  image[4] = b >> 8; image[5] = b; image[6] = a >> 8; image[7] = a;
+  mode.bitdepth = 16;
+  mode.colortype = LCT_RGBA;
+  error = lodepng_compute_color_stats(stats, image, 1, 1, &mode);
+  lodepng_color_mode_cleanup(&mode);
+  return error;
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*Computes a minimal PNG color model that can contain all colors as indicated by the stats.
+The stats should be computed with lodepng_compute_color_stats.
+mode_in is raw color profile of the image the stats were computed on, to copy palette order from when relevant.
+Minimal PNG color model means the color type and bit depth that gives smallest amount of bits in the output image,
+e.g. gray if only grayscale pixels, palette if less than 256 colors, color key if only single transparent color, ...
+This is used if auto_convert is enabled (it is by default).
+*/
+static unsigned auto_choose_color(LodePNGColorMode* mode_out,
+                                  const LodePNGColorMode* mode_in,
+                                  const LodePNGColorStats* stats) {
+  unsigned error = 0;
+  unsigned palettebits;
+  size_t i, n;
+  size_t numpixels = stats->numpixels;
+  unsigned palette_ok, gray_ok;
+
+  unsigned alpha = stats->alpha;
+  unsigned key = stats->key;
+  unsigned bits = stats->bits;
+
+  mode_out->key_defined = 0;
+
+  if(key && numpixels <= 16) {
+    alpha = 1; /*too few pixels to justify tRNS chunk overhead*/
+    key = 0;
+    if(bits < 8) bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/
+  }
+
+  gray_ok = !stats->colored;
+  if(!stats->allow_greyscale) gray_ok = 0;
+  if(!gray_ok && bits < 8) bits = 8;
+
+  n = stats->numcolors;
+  palettebits = n <= 2 ? 1 : (n <= 4 ? 2 : (n <= 16 ? 4 : 8));
+  palette_ok = n <= 256 && bits <= 8 && n != 0; /*n==0 means likely numcolors wasn't computed*/
+  if(numpixels < n * 2) palette_ok = 0; /*don't add palette overhead if image has only a few pixels*/
+  if(gray_ok && !alpha && bits <= palettebits) palette_ok = 0; /*gray is less overhead*/
+  if(!stats->allow_palette) palette_ok = 0;
+
+  if(palette_ok) {
+    const unsigned char* p = stats->palette;
+    lodepng_palette_clear(mode_out); /*remove potential earlier palette*/
+    for(i = 0; i != stats->numcolors; ++i) {
+      error = lodepng_palette_add(mode_out, p[i * 4 + 0], p[i * 4 + 1], p[i * 4 + 2], p[i * 4 + 3]);
+      if(error) break;
+    }
+
+    mode_out->colortype = LCT_PALETTE;
+    mode_out->bitdepth = palettebits;
+
+    if(mode_in->colortype == LCT_PALETTE && mode_in->palettesize >= mode_out->palettesize
+        && mode_in->bitdepth == mode_out->bitdepth) {
+      /*If input should have same palette colors, keep original to preserve its order and prevent conversion*/
+      lodepng_color_mode_cleanup(mode_out);
+      lodepng_color_mode_copy(mode_out, mode_in);
+    }
+  } else /*8-bit or 16-bit per channel*/ {
+    mode_out->bitdepth = bits;
+    mode_out->colortype = alpha ? (gray_ok ? LCT_GREY_ALPHA : LCT_RGBA)
+                                : (gray_ok ? LCT_GREY : LCT_RGB);
+    if(key) {
+      unsigned mask = (1u << mode_out->bitdepth) - 1u; /*stats always uses 16-bit, mask converts it*/
+      mode_out->key_r = stats->key_r & mask;
+      mode_out->key_g = stats->key_g & mask;
+      mode_out->key_b = stats->key_b & mask;
+      mode_out->key_defined = 1;
+    }
+  }
+
+  return error;
+}
+
+#endif /* #ifdef LODEPNG_COMPILE_ENCODER */
+
+/*
+Paeth predictor, used by PNG filter type 4
+The parameters are of type short, but should come from unsigned chars, the shorts
+are only needed to make the paeth calculation correct.
+*/
+static unsigned char paethPredictor(short a, short b, short c) {
+  short pa = LODEPNG_ABS(b - c);
+  short pb = LODEPNG_ABS(a - c);
+  short pc = LODEPNG_ABS(a + b - c - c);
+  /* return input value associated with smallest of pa, pb, pc (with certain priority if equal) */
+  if(pb < pa) { a = b; pa = pb; }
+  return (pc < pa) ? c : a;
+}
+
+/*shared values used by multiple Adam7 related functions*/
+
+static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/
+static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/
+static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/
+static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/
+
+/*
+Outputs various dimensions and positions in the image related to the Adam7 reduced images.
+passw: output containing the width of the 7 passes
+passh: output containing the height of the 7 passes
+filter_passstart: output containing the index of the start and end of each
+ reduced image with filter bytes
+padded_passstart output containing the index of the start and end of each
+ reduced image when without filter bytes but with padded scanlines
+passstart: output containing the index of the start and end of each reduced
+ image without padding between scanlines, but still padding between the images
+w, h: width and height of non-interlaced image
+bpp: bits per pixel
+"padded" is only relevant if bpp is less than 8 and a scanline or image does not
+ end at a full byte
+*/
+static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8],
+                                size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) {
+  /*the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass*/
+  unsigned i;
+
+  /*calculate width and height in pixels of each pass*/
+  for(i = 0; i != 7; ++i) {
+    passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i];
+    passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i];
+    if(passw[i] == 0) passh[i] = 0;
+    if(passh[i] == 0) passw[i] = 0;
+  }
+
+  filter_passstart[0] = padded_passstart[0] = passstart[0] = 0;
+  for(i = 0; i != 7; ++i) {
+    /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/
+    filter_passstart[i + 1] = filter_passstart[i]
+                            + ((passw[i] && passh[i]) ? passh[i] * (1u + (passw[i] * bpp + 7u) / 8u) : 0);
+    /*bits padded if needed to fill full byte at end of each scanline*/
+    padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7u) / 8u);
+    /*only padded at end of reduced image*/
+    passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7u) / 8u;
+  }
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / PNG Decoder                                                            / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*read the information from the header and store it in the LodePNGInfo. return value is error*/
+unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state,
+                         const unsigned char* in, size_t insize) {
+  unsigned width, height;
+  LodePNGInfo* info = &state->info_png;
+  if(insize == 0 || in == 0) {
+    CERROR_RETURN_ERROR(state->error, 48); /*error: the given data is empty*/
+  }
+  if(insize < 33) {
+    CERROR_RETURN_ERROR(state->error, 27); /*error: the data length is smaller than the length of a PNG header*/
+  }
+
+  /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/
+  /* TODO: remove this. One should use a new LodePNGState for new sessions */
+  lodepng_info_cleanup(info);
+  lodepng_info_init(info);
+
+  if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71
+     || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) {
+    CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signature*/
+  }
+  if(lodepng_chunk_length(in + 8) != 13) {
+    CERROR_RETURN_ERROR(state->error, 94); /*error: header size must be 13 bytes*/
+  }
+  if(!lodepng_chunk_type_equals(in + 8, "IHDR")) {
+    CERROR_RETURN_ERROR(state->error, 29); /*error: it doesn't start with a IHDR chunk!*/
+  }
+
+  /*read the values given in the header*/
+  width = lodepng_read32bitInt(&in[16]);
+  height = lodepng_read32bitInt(&in[20]);
+  /*TODO: remove the undocumented feature that allows to give null pointers to width or height*/
+  if(w) *w = width;
+  if(h) *h = height;
+  info->color.bitdepth = in[24];
+  info->color.colortype = (LodePNGColorType)in[25];
+  info->compression_method = in[26];
+  info->filter_method = in[27];
+  info->interlace_method = in[28];
+
+  /*errors returned only after the parsing so other values are still output*/
+
+  /*error: invalid image size*/
+  if(width == 0 || height == 0) CERROR_RETURN_ERROR(state->error, 93);
+  /*error: invalid colortype or bitdepth combination*/
+  state->error = checkColorValidity(info->color.colortype, info->color.bitdepth);
+  if(state->error) return state->error;
+  /*error: only compression method 0 is allowed in the specification*/
+  if(info->compression_method != 0) CERROR_RETURN_ERROR(state->error, 32);
+  /*error: only filter method 0 is allowed in the specification*/
+  if(info->filter_method != 0) CERROR_RETURN_ERROR(state->error, 33);
+  /*error: only interlace methods 0 and 1 exist in the specification*/
+  if(info->interlace_method > 1) CERROR_RETURN_ERROR(state->error, 34);
+
+  if(!state->decoder.ignore_crc) {
+    unsigned CRC = lodepng_read32bitInt(&in[29]);
+    unsigned checksum = lodepng_crc32(&in[12], 17);
+    if(CRC != checksum) {
+      CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/
+    }
+  }
+
+  return state->error;
+}
+
+static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon,
+                                 size_t bytewidth, unsigned char filterType, size_t length) {
+  /*
+  For PNG filter method 0
+  unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte,
+  the filter works byte per byte (bytewidth = 1)
+  precon is the previous unfiltered scanline, recon the result, scanline the current one
+  the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead
+  recon and scanline MAY be the same memory address! precon must be disjoint.
+  */
+
+  size_t i;
+  switch(filterType) {
+    case 0:
+      for(i = 0; i != length; ++i) recon[i] = scanline[i];
+      break;
+    case 1: {
+      size_t j = 0;
+      for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i];
+      for(i = bytewidth; i != length; ++i, ++j) recon[i] = scanline[i] + recon[j];
+      break;
+    }
+    case 2:
+      if(precon) {
+        for(i = 0; i != length; ++i) recon[i] = scanline[i] + precon[i];
+      } else {
+        for(i = 0; i != length; ++i) recon[i] = scanline[i];
+      }
+      break;
+    case 3:
+      if(precon) {
+        size_t j = 0;
+        for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i] + (precon[i] >> 1u);
+        /* Unroll independent paths of this predictor. A 6x and 8x version is also possible but that adds
+        too much code. Whether this speeds up anything depends on compiler and settings. */
+        if(bytewidth >= 4) {
+          for(; i + 3 < length; i += 4, j += 4) {
+            unsigned char s0 = scanline[i + 0], r0 = recon[j + 0], p0 = precon[i + 0];
+            unsigned char s1 = scanline[i + 1], r1 = recon[j + 1], p1 = precon[i + 1];
+            unsigned char s2 = scanline[i + 2], r2 = recon[j + 2], p2 = precon[i + 2];
+            unsigned char s3 = scanline[i + 3], r3 = recon[j + 3], p3 = precon[i + 3];
+            recon[i + 0] = s0 + ((r0 + p0) >> 1u);
+            recon[i + 1] = s1 + ((r1 + p1) >> 1u);
+            recon[i + 2] = s2 + ((r2 + p2) >> 1u);
+            recon[i + 3] = s3 + ((r3 + p3) >> 1u);
+          }
+        } else if(bytewidth >= 3) {
+          for(; i + 2 < length; i += 3, j += 3) {
+            unsigned char s0 = scanline[i + 0], r0 = recon[j + 0], p0 = precon[i + 0];
+            unsigned char s1 = scanline[i + 1], r1 = recon[j + 1], p1 = precon[i + 1];
+            unsigned char s2 = scanline[i + 2], r2 = recon[j + 2], p2 = precon[i + 2];
+            recon[i + 0] = s0 + ((r0 + p0) >> 1u);
+            recon[i + 1] = s1 + ((r1 + p1) >> 1u);
+            recon[i + 2] = s2 + ((r2 + p2) >> 1u);
+          }
+        } else if(bytewidth >= 2) {
+          for(; i + 1 < length; i += 2, j += 2) {
+            unsigned char s0 = scanline[i + 0], r0 = recon[j + 0], p0 = precon[i + 0];
+            unsigned char s1 = scanline[i + 1], r1 = recon[j + 1], p1 = precon[i + 1];
+            recon[i + 0] = s0 + ((r0 + p0) >> 1u);
+            recon[i + 1] = s1 + ((r1 + p1) >> 1u);
+          }
+        }
+        for(; i != length; ++i, ++j) recon[i] = scanline[i] + ((recon[j] + precon[i]) >> 1u);
+      } else {
+        size_t j = 0;
+        for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i];
+        for(i = bytewidth; i != length; ++i, ++j) recon[i] = scanline[i] + (recon[j] >> 1u);
+      }
+      break;
+    case 4:
+      if(precon) {
+        size_t j = 0;
+        for(i = 0; i != bytewidth; ++i) {
+          recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/
+        }
+
+        /* Unroll independent paths of the paeth predictor. A 6x and 8x version is also possible but that
+        adds too much code. Whether this speeds up anything depends on compiler and settings. */
+        if(bytewidth >= 4) {
+          for(; i + 3 < length; i += 4, j += 4) {
+            unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2], s3 = scanline[i + 3];
+            unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2], r3 = recon[j + 3];
+            unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2], p3 = precon[i + 3];
+            unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2], q3 = precon[j + 3];
+            recon[i + 0] = s0 + paethPredictor(r0, p0, q0);
+            recon[i + 1] = s1 + paethPredictor(r1, p1, q1);
+            recon[i + 2] = s2 + paethPredictor(r2, p2, q2);
+            recon[i + 3] = s3 + paethPredictor(r3, p3, q3);
+          }
+        } else if(bytewidth >= 3) {
+          for(; i + 2 < length; i += 3, j += 3) {
+            unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2];
+            unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2];
+            unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2];
+            unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2];
+            recon[i + 0] = s0 + paethPredictor(r0, p0, q0);
+            recon[i + 1] = s1 + paethPredictor(r1, p1, q1);
+            recon[i + 2] = s2 + paethPredictor(r2, p2, q2);
+          }
+        } else if(bytewidth >= 2) {
+          for(; i + 1 < length; i += 2, j += 2) {
+            unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1];
+            unsigned char r0 = recon[j + 0], r1 = recon[j + 1];
+            unsigned char p0 = precon[i + 0], p1 = precon[i + 1];
+            unsigned char q0 = precon[j + 0], q1 = precon[j + 1];
+            recon[i + 0] = s0 + paethPredictor(r0, p0, q0);
+            recon[i + 1] = s1 + paethPredictor(r1, p1, q1);
+          }
+        }
+
+        for(; i != length; ++i, ++j) {
+          recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[j]));
+        }
+      } else {
+        size_t j = 0;
+        for(i = 0; i != bytewidth; ++i) {
+          recon[i] = scanline[i];
+        }
+        for(i = bytewidth; i != length; ++i, ++j) {
+          /*paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth]*/
+          recon[i] = (scanline[i] + recon[j]);
+        }
+      }
+      break;
+    default: return 36; /*error: invalid filter type given*/
+  }
+  return 0;
+}
+
+static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) {
+  /*
+  For PNG filter method 0
+  this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times)
+  out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline
+  w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel
+  in and out are allowed to be the same memory address (but aren't the same size since in has the extra filter bytes)
+  */
+
+  unsigned y;
+  unsigned char* prevline = 0;
+
+  /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/
+  size_t bytewidth = (bpp + 7u) / 8u;
+  /*the width of a scanline in bytes, not including the filter type*/
+  size_t linebytes = lodepng_get_raw_size_idat(w, 1, bpp) - 1u;
+
+  for(y = 0; y < h; ++y) {
+    size_t outindex = linebytes * y;
+    size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
+    unsigned char filterType = in[inindex];
+
+    CERROR_TRY_RETURN(unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes));
+
+    prevline = &out[outindex];
+  }
+
+  return 0;
+}
+
+/*
+in: Adam7 interlaced image, with no padding bits between scanlines, but between
+ reduced images so that each reduced image starts at a byte.
+out: the same pixels, but re-ordered so that they're now a non-interlaced image with size w*h
+bpp: bits per pixel
+out has the following size in bits: w * h * bpp.
+in is possibly bigger due to padding bits between reduced images.
+out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation
+(because that's likely a little bit faster)
+NOTE: comments about padding bits are only relevant if bpp < 8
+*/
+static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) {
+  unsigned passw[7], passh[7];
+  size_t filter_passstart[8], padded_passstart[8], passstart[8];
+  unsigned i;
+
+  Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+  if(bpp >= 8) {
+    for(i = 0; i != 7; ++i) {
+      unsigned x, y, b;
+      size_t bytewidth = bpp / 8u;
+      for(y = 0; y < passh[i]; ++y)
+      for(x = 0; x < passw[i]; ++x) {
+        size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth;
+        size_t pixeloutstart = ((ADAM7_IY[i] + (size_t)y * ADAM7_DY[i]) * (size_t)w
+                             + ADAM7_IX[i] + (size_t)x * ADAM7_DX[i]) * bytewidth;
+        for(b = 0; b < bytewidth; ++b) {
+          out[pixeloutstart + b] = in[pixelinstart + b];
+        }
+      }
+    }
+  } else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ {
+    for(i = 0; i != 7; ++i) {
+      unsigned x, y, b;
+      unsigned ilinebits = bpp * passw[i];
+      unsigned olinebits = bpp * w;
+      size_t obp, ibp; /*bit pointers (for out and in buffer)*/
+      for(y = 0; y < passh[i]; ++y)
+      for(x = 0; x < passw[i]; ++x) {
+        ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp);
+        obp = (ADAM7_IY[i] + (size_t)y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + (size_t)x * ADAM7_DX[i]) * bpp;
+        for(b = 0; b < bpp; ++b) {
+          unsigned char bit = readBitFromReversedStream(&ibp, in);
+          setBitOfReversedStream(&obp, out, bit);
+        }
+      }
+    }
+  }
+}
+
+static void removePaddingBits(unsigned char* out, const unsigned char* in,
+                              size_t olinebits, size_t ilinebits, unsigned h) {
+  /*
+  After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need
+  to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers
+  for the Adam7 code, the color convert code and the output to the user.
+  in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must
+  have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits
+  also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7
+  only useful if (ilinebits - olinebits) is a value in the range 1..7
+  */
+  unsigned y;
+  size_t diff = ilinebits - olinebits;
+  size_t ibp = 0, obp = 0; /*input and output bit pointers*/
+  for(y = 0; y < h; ++y) {
+    size_t x;
+    for(x = 0; x < olinebits; ++x) {
+      unsigned char bit = readBitFromReversedStream(&ibp, in);
+      setBitOfReversedStream(&obp, out, bit);
+    }
+    ibp += diff;
+  }
+}
+
+/*out must be buffer big enough to contain full image, and in must contain the full decompressed data from
+the IDAT chunks (with filter index bytes and possible padding bits)
+return value is error*/
+static unsigned postProcessScanlines(unsigned char* out, unsigned char* in,
+                                     unsigned w, unsigned h, const LodePNGInfo* info_png) {
+  /*
+  This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype.
+  Steps:
+  *) if no Adam7: 1) unfilter 2) remove padding bits (= possible extra bits per scanline if bpp < 8)
+  *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace
+  NOTE: the in buffer will be overwritten with intermediate data!
+  */
+  unsigned bpp = lodepng_get_bpp(&info_png->color);
+  if(bpp == 0) return 31; /*error: invalid colortype*/
+
+  if(info_png->interlace_method == 0) {
+    if(bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) {
+      CERROR_TRY_RETURN(unfilter(in, in, w, h, bpp));
+      removePaddingBits(out, in, w * bpp, ((w * bpp + 7u) / 8u) * 8u, h);
+    }
+    /*we can immediately filter into the out buffer, no other steps needed*/
+    else CERROR_TRY_RETURN(unfilter(out, in, w, h, bpp));
+  } else /*interlace_method is 1 (Adam7)*/ {
+    unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8];
+    unsigned i;
+
+    Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+    for(i = 0; i != 7; ++i) {
+      CERROR_TRY_RETURN(unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp));
+      /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline,
+      move bytes instead of bits or move not at all*/
+      if(bpp < 8) {
+        /*remove padding bits in scanlines; after this there still may be padding
+        bits between the different reduced images: each reduced image still starts nicely at a byte*/
+        removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp,
+                          ((passw[i] * bpp + 7u) / 8u) * 8u, passh[i]);
+      }
+    }
+
+    Adam7_deinterlace(out, in, w, h, bpp);
+  }
+
+  return 0;
+}
+
+static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) {
+  unsigned pos = 0, i;
+  color->palettesize = chunkLength / 3u;
+  if(color->palettesize == 0 || color->palettesize > 256) return 38; /*error: palette too small or big*/
+  lodepng_color_mode_alloc_palette(color);
+  if(!color->palette && color->palettesize) {
+    color->palettesize = 0;
+    return 83; /*alloc fail*/
+  }
+
+  for(i = 0; i != color->palettesize; ++i) {
+    color->palette[4 * i + 0] = data[pos++]; /*R*/
+    color->palette[4 * i + 1] = data[pos++]; /*G*/
+    color->palette[4 * i + 2] = data[pos++]; /*B*/
+    color->palette[4 * i + 3] = 255; /*alpha*/
+  }
+
+  return 0; /* OK */
+}
+
+static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) {
+  unsigned i;
+  if(color->colortype == LCT_PALETTE) {
+    /*error: more alpha values given than there are palette entries*/
+    if(chunkLength > color->palettesize) return 39;
+
+    for(i = 0; i != chunkLength; ++i) color->palette[4 * i + 3] = data[i];
+  } else if(color->colortype == LCT_GREY) {
+    /*error: this chunk must be 2 bytes for grayscale image*/
+    if(chunkLength != 2) return 30;
+
+    color->key_defined = 1;
+    color->key_r = color->key_g = color->key_b = 256u * data[0] + data[1];
+  } else if(color->colortype == LCT_RGB) {
+    /*error: this chunk must be 6 bytes for RGB image*/
+    if(chunkLength != 6) return 41;
+
+    color->key_defined = 1;
+    color->key_r = 256u * data[0] + data[1];
+    color->key_g = 256u * data[2] + data[3];
+    color->key_b = 256u * data[4] + data[5];
+  }
+  else return 42; /*error: tRNS chunk not allowed for other color models*/
+
+  return 0; /* OK */
+}
+
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*background color chunk (bKGD)*/
+static unsigned readChunk_bKGD(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  if(info->color.colortype == LCT_PALETTE) {
+    /*error: this chunk must be 1 byte for indexed color image*/
+    if(chunkLength != 1) return 43;
+
+    /*error: invalid palette index, or maybe this chunk appeared before PLTE*/
+    if(data[0] >= info->color.palettesize) return 103;
+
+    info->background_defined = 1;
+    info->background_r = info->background_g = info->background_b = data[0];
+  } else if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) {
+    /*error: this chunk must be 2 bytes for grayscale image*/
+    if(chunkLength != 2) return 44;
+
+    /*the values are truncated to bitdepth in the PNG file*/
+    info->background_defined = 1;
+    info->background_r = info->background_g = info->background_b = 256u * data[0] + data[1];
+  } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) {
+    /*error: this chunk must be 6 bytes for grayscale image*/
+    if(chunkLength != 6) return 45;
+
+    /*the values are truncated to bitdepth in the PNG file*/
+    info->background_defined = 1;
+    info->background_r = 256u * data[0] + data[1];
+    info->background_g = 256u * data[2] + data[3];
+    info->background_b = 256u * data[4] + data[5];
+  }
+
+  return 0; /* OK */
+}
+
+/*text chunk (tEXt)*/
+static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  unsigned error = 0;
+  char *key = 0, *str = 0;
+
+  while(!error) /*not really a while loop, only used to break on error*/ {
+    unsigned length, string2_begin;
+
+    length = 0;
+    while(length < chunkLength && data[length] != 0) ++length;
+    /*even though it's not allowed by the standard, no error is thrown if
+    there's no null termination char, if the text is empty*/
+    if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/
+
+    key = (char*)lodepng_malloc(length + 1);
+    if(!key) CERROR_BREAK(error, 83); /*alloc fail*/
+
+    lodepng_memcpy(key, data, length);
+    key[length] = 0;
+
+    string2_begin = length + 1; /*skip keyword null terminator*/
+
+    length = (unsigned)(chunkLength < string2_begin ? 0 : chunkLength - string2_begin);
+    str = (char*)lodepng_malloc(length + 1);
+    if(!str) CERROR_BREAK(error, 83); /*alloc fail*/
+
+    lodepng_memcpy(str, data + string2_begin, length);
+    str[length] = 0;
+
+    error = lodepng_add_text(info, key, str);
+
+    break;
+  }
+
+  lodepng_free(key);
+  lodepng_free(str);
+
+  return error;
+}
+
+/*compressed text chunk (zTXt)*/
+static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecoderSettings* decoder,
+                               const unsigned char* data, size_t chunkLength) {
+  unsigned error = 0;
+
+  /*copy the object to change parameters in it*/
+  LodePNGDecompressSettings zlibsettings = decoder->zlibsettings;
+
+  unsigned length, string2_begin;
+  char *key = 0;
+  unsigned char* str = 0;
+  size_t size = 0;
+
+  while(!error) /*not really a while loop, only used to break on error*/ {
+    for(length = 0; length < chunkLength && data[length] != 0; ++length) ;
+    if(length + 2 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/
+    if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/
+
+    key = (char*)lodepng_malloc(length + 1);
+    if(!key) CERROR_BREAK(error, 83); /*alloc fail*/
+
+    lodepng_memcpy(key, data, length);
+    key[length] = 0;
+
+    if(data[length + 1] != 0) CERROR_BREAK(error, 72); /*the 0 byte indicating compression must be 0*/
+
+    string2_begin = length + 2;
+    if(string2_begin > chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/
+
+    length = (unsigned)chunkLength - string2_begin;
+    zlibsettings.max_output_size = decoder->max_text_size;
+    /*will fail if zlib error, e.g. if length is too small*/
+    error = zlib_decompress(&str, &size, 0, &data[string2_begin],
+                            length, &zlibsettings);
+    /*error: compressed text larger than  decoder->max_text_size*/
+    if(error && size > zlibsettings.max_output_size) error = 112;
+    if(error) break;
+    error = lodepng_add_text_sized(info, key, (char*)str, size);
+    break;
+  }
+
+  lodepng_free(key);
+  lodepng_free(str);
+
+  return error;
+}
+
+/*international text chunk (iTXt)*/
+static unsigned readChunk_iTXt(LodePNGInfo* info, const LodePNGDecoderSettings* decoder,
+                               const unsigned char* data, size_t chunkLength) {
+  unsigned error = 0;
+  unsigned i;
+
+  /*copy the object to change parameters in it*/
+  LodePNGDecompressSettings zlibsettings = decoder->zlibsettings;
+
+  unsigned length, begin, compressed;
+  char *key = 0, *langtag = 0, *transkey = 0;
+
+  while(!error) /*not really a while loop, only used to break on error*/ {
+    /*Quick check if the chunk length isn't too small. Even without check
+    it'd still fail with other error checks below if it's too short. This just gives a different error code.*/
+    if(chunkLength < 5) CERROR_BREAK(error, 30); /*iTXt chunk too short*/
+
+    /*read the key*/
+    for(length = 0; length < chunkLength && data[length] != 0; ++length) ;
+    if(length + 3 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination char, corrupt?*/
+    if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/
+
+    key = (char*)lodepng_malloc(length + 1);
+    if(!key) CERROR_BREAK(error, 83); /*alloc fail*/
+
+    lodepng_memcpy(key, data, length);
+    key[length] = 0;
+
+    /*read the compression method*/
+    compressed = data[length + 1];
+    if(data[length + 2] != 0) CERROR_BREAK(error, 72); /*the 0 byte indicating compression must be 0*/
+
+    /*even though it's not allowed by the standard, no error is thrown if
+    there's no null termination char, if the text is empty for the next 3 texts*/
+
+    /*read the langtag*/
+    begin = length + 3;
+    length = 0;
+    for(i = begin; i < chunkLength && data[i] != 0; ++i) ++length;
+
+    langtag = (char*)lodepng_malloc(length + 1);
+    if(!langtag) CERROR_BREAK(error, 83); /*alloc fail*/
+
+    lodepng_memcpy(langtag, data + begin, length);
+    langtag[length] = 0;
+
+    /*read the transkey*/
+    begin += length + 1;
+    length = 0;
+    for(i = begin; i < chunkLength && data[i] != 0; ++i) ++length;
+
+    transkey = (char*)lodepng_malloc(length + 1);
+    if(!transkey) CERROR_BREAK(error, 83); /*alloc fail*/
+
+    lodepng_memcpy(transkey, data + begin, length);
+    transkey[length] = 0;
+
+    /*read the actual text*/
+    begin += length + 1;
+
+    length = (unsigned)chunkLength < begin ? 0 : (unsigned)chunkLength - begin;
+
+    if(compressed) {
+      unsigned char* str = 0;
+      size_t size = 0;
+      zlibsettings.max_output_size = decoder->max_text_size;
+      /*will fail if zlib error, e.g. if length is too small*/
+      error = zlib_decompress(&str, &size, 0, &data[begin],
+                              length, &zlibsettings);
+      /*error: compressed text larger than  decoder->max_text_size*/
+      if(error && size > zlibsettings.max_output_size) error = 112;
+      if(!error) error = lodepng_add_itext_sized(info, key, langtag, transkey, (char*)str, size);
+      lodepng_free(str);
+    } else {
+      error = lodepng_add_itext_sized(info, key, langtag, transkey, (char*)(data + begin), length);
+    }
+
+    break;
+  }
+
+  lodepng_free(key);
+  lodepng_free(langtag);
+  lodepng_free(transkey);
+
+  return error;
+}
+
+static unsigned readChunk_tIME(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  if(chunkLength != 7) return 73; /*invalid tIME chunk size*/
+
+  info->time_defined = 1;
+  info->time.year = 256u * data[0] + data[1];
+  info->time.month = data[2];
+  info->time.day = data[3];
+  info->time.hour = data[4];
+  info->time.minute = data[5];
+  info->time.second = data[6];
+
+  return 0; /* OK */
+}
+
+static unsigned readChunk_pHYs(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  if(chunkLength != 9) return 74; /*invalid pHYs chunk size*/
+
+  info->phys_defined = 1;
+  info->phys_x = 16777216u * data[0] + 65536u * data[1] + 256u * data[2] + data[3];
+  info->phys_y = 16777216u * data[4] + 65536u * data[5] + 256u * data[6] + data[7];
+  info->phys_unit = data[8];
+
+  return 0; /* OK */
+}
+
+static unsigned readChunk_gAMA(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  if(chunkLength != 4) return 96; /*invalid gAMA chunk size*/
+
+  info->gama_defined = 1;
+  info->gama_gamma = 16777216u * data[0] + 65536u * data[1] + 256u * data[2] + data[3];
+
+  return 0; /* OK */
+}
+
+static unsigned readChunk_cHRM(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  if(chunkLength != 32) return 97; /*invalid cHRM chunk size*/
+
+  info->chrm_defined = 1;
+  info->chrm_white_x = 16777216u * data[ 0] + 65536u * data[ 1] + 256u * data[ 2] + data[ 3];
+  info->chrm_white_y = 16777216u * data[ 4] + 65536u * data[ 5] + 256u * data[ 6] + data[ 7];
+  info->chrm_red_x   = 16777216u * data[ 8] + 65536u * data[ 9] + 256u * data[10] + data[11];
+  info->chrm_red_y   = 16777216u * data[12] + 65536u * data[13] + 256u * data[14] + data[15];
+  info->chrm_green_x = 16777216u * data[16] + 65536u * data[17] + 256u * data[18] + data[19];
+  info->chrm_green_y = 16777216u * data[20] + 65536u * data[21] + 256u * data[22] + data[23];
+  info->chrm_blue_x  = 16777216u * data[24] + 65536u * data[25] + 256u * data[26] + data[27];
+  info->chrm_blue_y  = 16777216u * data[28] + 65536u * data[29] + 256u * data[30] + data[31];
+
+  return 0; /* OK */
+}
+
+static unsigned readChunk_sRGB(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) {
+  if(chunkLength != 1) return 98; /*invalid sRGB chunk size (this one is never ignored)*/
+
+  info->srgb_defined = 1;
+  info->srgb_intent = data[0];
+
+  return 0; /* OK */
+}
+
+static unsigned readChunk_iCCP(LodePNGInfo* info, const LodePNGDecoderSettings* decoder,
+                               const unsigned char* data, size_t chunkLength) {
+  unsigned error = 0;
+  unsigned i;
+  size_t size = 0;
+  /*copy the object to change parameters in it*/
+  LodePNGDecompressSettings zlibsettings = decoder->zlibsettings;
+
+  unsigned length, string2_begin;
+
+  info->iccp_defined = 1;
+  if(info->iccp_name) lodepng_clear_icc(info);
+
+  for(length = 0; length < chunkLength && data[length] != 0; ++length) ;
+  if(length + 2 >= chunkLength) return 75; /*no null termination, corrupt?*/
+  if(length < 1 || length > 79) return 89; /*keyword too short or long*/
+
+  info->iccp_name = (char*)lodepng_malloc(length + 1);
+  if(!info->iccp_name) return 83; /*alloc fail*/
+
+  info->iccp_name[length] = 0;
+  for(i = 0; i != length; ++i) info->iccp_name[i] = (char)data[i];
+
+  if(data[length + 1] != 0) return 72; /*the 0 byte indicating compression must be 0*/
+
+  string2_begin = length + 2;
+  if(string2_begin > chunkLength) return 75; /*no null termination, corrupt?*/
+
+  length = (unsigned)chunkLength - string2_begin;
+  zlibsettings.max_output_size = decoder->max_icc_size;
+  error = zlib_decompress(&info->iccp_profile, &size, 0,
+                          &data[string2_begin],
+                          length, &zlibsettings);
+  /*error: ICC profile larger than  decoder->max_icc_size*/
+  if(error && size > zlibsettings.max_output_size) error = 113;
+  info->iccp_profile_size = size;
+  if(!error && !info->iccp_profile_size) error = 100; /*invalid ICC profile size*/
+  return error;
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+unsigned lodepng_inspect_chunk(LodePNGState* state, size_t pos,
+                               const unsigned char* in, size_t insize) {
+  const unsigned char* chunk = in + pos;
+  unsigned chunkLength;
+  const unsigned char* data;
+  unsigned unhandled = 0;
+  unsigned error = 0;
+
+  if(pos + 4 > insize) return 30;
+  chunkLength = lodepng_chunk_length(chunk);
+  if(chunkLength > 2147483647) return 63;
+  data = lodepng_chunk_data_const(chunk);
+  if(data + chunkLength + 4 > in + insize) return 30;
+
+  if(lodepng_chunk_type_equals(chunk, "PLTE")) {
+    error = readChunk_PLTE(&state->info_png.color, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "tRNS")) {
+    error = readChunk_tRNS(&state->info_png.color, data, chunkLength);
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  } else if(lodepng_chunk_type_equals(chunk, "bKGD")) {
+    error = readChunk_bKGD(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "tEXt")) {
+    error = readChunk_tEXt(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "zTXt")) {
+    error = readChunk_zTXt(&state->info_png, &state->decoder, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "iTXt")) {
+    error = readChunk_iTXt(&state->info_png, &state->decoder, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "tIME")) {
+    error = readChunk_tIME(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "pHYs")) {
+    error = readChunk_pHYs(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "gAMA")) {
+    error = readChunk_gAMA(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "cHRM")) {
+    error = readChunk_cHRM(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "sRGB")) {
+    error = readChunk_sRGB(&state->info_png, data, chunkLength);
+  } else if(lodepng_chunk_type_equals(chunk, "iCCP")) {
+    error = readChunk_iCCP(&state->info_png, &state->decoder, data, chunkLength);
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  } else {
+    /* unhandled chunk is ok (is not an error) */
+    unhandled = 1;
+  }
+
+  if(!error && !unhandled && !state->decoder.ignore_crc) {
+    if(lodepng_chunk_check_crc(chunk)) return 57; /*invalid CRC*/
+  }
+
+  return error;
+}
+
+/*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/
+static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h,
+                          LodePNGState* state,
+                          const unsigned char* in, size_t insize) {
+  unsigned char IEND = 0;
+  const unsigned char* chunk;
+  unsigned char* idat; /*the data from idat chunks, zlib compressed*/
+  size_t idatsize = 0;
+  unsigned char* scanlines = 0;
+  size_t scanlines_size = 0, expected_size = 0;
+  size_t outsize = 0;
+
+  /*for unknown chunk order*/
+  unsigned unknown = 0;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+
+  /* safe output values in case error happens */
+  *out = 0;
+  *w = *h = 0;
+
+  state->error = lodepng_inspect(w, h, state, in, insize); /*reads header and resets other parameters in state->info_png*/
+  if(state->error) return;
+
+  if(lodepng_pixel_overflow(*w, *h, &state->info_png.color, &state->info_raw)) {
+    CERROR_RETURN(state->error, 92); /*overflow possible due to amount of pixels*/
+  }
+
+  /*the input filesize is a safe upper bound for the sum of idat chunks size*/
+  idat = (unsigned char*)lodepng_malloc(insize);
+  if(!idat) CERROR_RETURN(state->error, 83); /*alloc fail*/
+
+  chunk = &in[33]; /*first byte of the first chunk after the header*/
+
+  /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk.
+  IDAT data is put at the start of the in buffer*/
+  while(!IEND && !state->error) {
+    unsigned chunkLength;
+    const unsigned char* data; /*the data in the chunk*/
+
+    /*error: size of the in buffer too small to contain next chunk*/
+    if((size_t)((chunk - in) + 12) > insize || chunk < in) {
+      if(state->decoder.ignore_end) break; /*other errors may still happen though*/
+      CERROR_BREAK(state->error, 30);
+    }
+
+    /*length of the data of the chunk, excluding the length bytes, chunk type and CRC bytes*/
+    chunkLength = lodepng_chunk_length(chunk);
+    /*error: chunk length larger than the max PNG chunk size*/
+    if(chunkLength > 2147483647) {
+      if(state->decoder.ignore_end) break; /*other errors may still happen though*/
+      CERROR_BREAK(state->error, 63);
+    }
+
+    if((size_t)((chunk - in) + chunkLength + 12) > insize || (chunk + chunkLength + 12) < in) {
+      CERROR_BREAK(state->error, 64); /*error: size of the in buffer too small to contain next chunk*/
+    }
+
+    data = lodepng_chunk_data_const(chunk);
+
+    unknown = 0;
+
+    /*IDAT chunk, containing compressed image data*/
+    if(lodepng_chunk_type_equals(chunk, "IDAT")) {
+      size_t newsize;
+      if(lodepng_addofl(idatsize, chunkLength, &newsize)) CERROR_BREAK(state->error, 95);
+      if(newsize > insize) CERROR_BREAK(state->error, 95);
+      lodepng_memcpy(idat + idatsize, data, chunkLength);
+      idatsize += chunkLength;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      critical_pos = 3;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    } else if(lodepng_chunk_type_equals(chunk, "IEND")) {
+      /*IEND chunk*/
+      IEND = 1;
+    } else if(lodepng_chunk_type_equals(chunk, "PLTE")) {
+      /*palette chunk (PLTE)*/
+      state->error = readChunk_PLTE(&state->info_png.color, data, chunkLength);
+      if(state->error) break;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      critical_pos = 2;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    } else if(lodepng_chunk_type_equals(chunk, "tRNS")) {
+      /*palette transparency chunk (tRNS). Even though this one is an ancillary chunk , it is still compiled
+      in without 'LODEPNG_COMPILE_ANCILLARY_CHUNKS' because it contains essential color information that
+      affects the alpha channel of pixels. */
+      state->error = readChunk_tRNS(&state->info_png.color, data, chunkLength);
+      if(state->error) break;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      /*background color chunk (bKGD)*/
+    } else if(lodepng_chunk_type_equals(chunk, "bKGD")) {
+      state->error = readChunk_bKGD(&state->info_png, data, chunkLength);
+      if(state->error) break;
+    } else if(lodepng_chunk_type_equals(chunk, "tEXt")) {
+      /*text chunk (tEXt)*/
+      if(state->decoder.read_text_chunks) {
+        state->error = readChunk_tEXt(&state->info_png, data, chunkLength);
+        if(state->error) break;
+      }
+    } else if(lodepng_chunk_type_equals(chunk, "zTXt")) {
+      /*compressed text chunk (zTXt)*/
+      if(state->decoder.read_text_chunks) {
+        state->error = readChunk_zTXt(&state->info_png, &state->decoder, data, chunkLength);
+        if(state->error) break;
+      }
+    } else if(lodepng_chunk_type_equals(chunk, "iTXt")) {
+      /*international text chunk (iTXt)*/
+      if(state->decoder.read_text_chunks) {
+        state->error = readChunk_iTXt(&state->info_png, &state->decoder, data, chunkLength);
+        if(state->error) break;
+      }
+    } else if(lodepng_chunk_type_equals(chunk, "tIME")) {
+      state->error = readChunk_tIME(&state->info_png, data, chunkLength);
+      if(state->error) break;
+    } else if(lodepng_chunk_type_equals(chunk, "pHYs")) {
+      state->error = readChunk_pHYs(&state->info_png, data, chunkLength);
+      if(state->error) break;
+    } else if(lodepng_chunk_type_equals(chunk, "gAMA")) {
+      state->error = readChunk_gAMA(&state->info_png, data, chunkLength);
+      if(state->error) break;
+    } else if(lodepng_chunk_type_equals(chunk, "cHRM")) {
+      state->error = readChunk_cHRM(&state->info_png, data, chunkLength);
+      if(state->error) break;
+    } else if(lodepng_chunk_type_equals(chunk, "sRGB")) {
+      state->error = readChunk_sRGB(&state->info_png, data, chunkLength);
+      if(state->error) break;
+    } else if(lodepng_chunk_type_equals(chunk, "iCCP")) {
+      state->error = readChunk_iCCP(&state->info_png, &state->decoder, data, chunkLength);
+      if(state->error) break;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    } else /*it's not an implemented chunk type, so ignore it: skip over the data*/ {
+      /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/
+      if(!state->decoder.ignore_critical && !lodepng_chunk_ancillary(chunk)) {
+        CERROR_BREAK(state->error, 69);
+      }
+
+      unknown = 1;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+      if(state->decoder.remember_unknown_chunks) {
+        state->error = lodepng_chunk_append(&state->info_png.unknown_chunks_data[critical_pos - 1],
+                                            &state->info_png.unknown_chunks_size[critical_pos - 1], chunk);
+        if(state->error) break;
+      }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    }
+
+    if(!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/ {
+      if(lodepng_chunk_check_crc(chunk)) CERROR_BREAK(state->error, 57); /*invalid CRC*/
+    }
+
+    if(!IEND) chunk = lodepng_chunk_next_const(chunk, in + insize);
+  }
+
+  if(!state->error && state->info_png.color.colortype == LCT_PALETTE && !state->info_png.color.palette) {
+    state->error = 106; /* error: PNG file must have PLTE chunk if color type is palette */
+  }
+
+  if(!state->error) {
+    /*predict output size, to allocate exact size for output buffer to avoid more dynamic allocation.
+    If the decompressed size does not match the prediction, the image must be corrupt.*/
+    if(state->info_png.interlace_method == 0) {
+      size_t bpp = lodepng_get_bpp(&state->info_png.color);
+      expected_size = lodepng_get_raw_size_idat(*w, *h, bpp);
+    } else {
+      size_t bpp = lodepng_get_bpp(&state->info_png.color);
+      /*Adam-7 interlaced: expected size is the sum of the 7 sub-images sizes*/
+      expected_size = 0;
+      expected_size += lodepng_get_raw_size_idat((*w + 7) >> 3, (*h + 7) >> 3, bpp);
+      if(*w > 4) expected_size += lodepng_get_raw_size_idat((*w + 3) >> 3, (*h + 7) >> 3, bpp);
+      expected_size += lodepng_get_raw_size_idat((*w + 3) >> 2, (*h + 3) >> 3, bpp);
+      if(*w > 2) expected_size += lodepng_get_raw_size_idat((*w + 1) >> 2, (*h + 3) >> 2, bpp);
+      expected_size += lodepng_get_raw_size_idat((*w + 1) >> 1, (*h + 1) >> 2, bpp);
+      if(*w > 1) expected_size += lodepng_get_raw_size_idat((*w + 0) >> 1, (*h + 1) >> 1, bpp);
+      expected_size += lodepng_get_raw_size_idat((*w + 0), (*h + 0) >> 1, bpp);
+    }
+
+    state->error = zlib_decompress(&scanlines, &scanlines_size, expected_size, idat, idatsize, &state->decoder.zlibsettings);
+  }
+  if(!state->error && scanlines_size != expected_size) state->error = 91; /*decompressed size doesn't match prediction*/
+  lodepng_free(idat);
+
+  if(!state->error) {
+    outsize = lodepng_get_raw_size(*w, *h, &state->info_png.color);
+    *out = (unsigned char*)lodepng_malloc(outsize);
+    if(!*out) state->error = 83; /*alloc fail*/
+  }
+  if(!state->error) {
+    lodepng_memset(*out, 0, outsize);
+    state->error = postProcessScanlines(*out, scanlines, *w, *h, &state->info_png);
+  }
+  lodepng_free(scanlines);
+}
+
+unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h,
+                        LodePNGState* state,
+                        const unsigned char* in, size_t insize) {
+  *out = 0;
+  decodeGeneric(out, w, h, state, in, insize);
+  if(state->error) return state->error;
+  if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) {
+    /*same color type, no copying or converting of data needed*/
+    /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype
+    the raw image has to the end user*/
+    if(!state->decoder.color_convert) {
+      state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color);
+      if(state->error) return state->error;
+    }
+  } else { /*color conversion needed*/
+    unsigned char* data = *out;
+    size_t outsize;
+
+    /*TODO: check if this works according to the statement in the documentation: "The converter can convert
+    from grayscale input color type, to 8-bit grayscale or grayscale with alpha"*/
+    if(!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA)
+       && !(state->info_raw.bitdepth == 8)) {
+      return 56; /*unsupported color mode conversion*/
+    }
+
+    outsize = lodepng_get_raw_size(*w, *h, &state->info_raw);
+    *out = (unsigned char*)lodepng_malloc(outsize);
+    if(!(*out)) {
+      state->error = 83; /*alloc fail*/
+    }
+    else state->error = lodepng_convert(*out, data, &state->info_raw,
+                                        &state->info_png.color, *w, *h);
+    lodepng_free(data);
+  }
+  return state->error;
+}
+
+unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in,
+                               size_t insize, LodePNGColorType colortype, unsigned bitdepth) {
+  unsigned error;
+  LodePNGState state;
+  lodepng_state_init(&state);
+  state.info_raw.colortype = colortype;
+  state.info_raw.bitdepth = bitdepth;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*disable reading things that this function doesn't output*/
+  state.decoder.read_text_chunks = 0;
+  state.decoder.remember_unknown_chunks = 0;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  error = lodepng_decode(out, w, h, &state, in, insize);
+  lodepng_state_cleanup(&state);
+  return error;
+}
+
+unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) {
+  return lodepng_decode_memory(out, w, h, in, insize, LCT_RGBA, 8);
+}
+
+unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) {
+  return lodepng_decode_memory(out, w, h, in, insize, LCT_RGB, 8);
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename,
+                             LodePNGColorType colortype, unsigned bitdepth) {
+  unsigned char* buffer = 0;
+  size_t buffersize;
+  unsigned error;
+  /* safe output values in case error happens */
+  *out = 0;
+  *w = *h = 0;
+  error = lodepng_load_file(&buffer, &buffersize, filename);
+  if(!error) error = lodepng_decode_memory(out, w, h, buffer, buffersize, colortype, bitdepth);
+  lodepng_free(buffer);
+  return error;
+}
+
+unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) {
+  return lodepng_decode_file(out, w, h, filename, LCT_RGBA, 8);
+}
+
+unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) {
+  return lodepng_decode_file(out, w, h, filename, LCT_RGB, 8);
+}
+#endif /*LODEPNG_COMPILE_DISK*/
+
+void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) {
+  settings->color_convert = 1;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  settings->read_text_chunks = 1;
+  settings->remember_unknown_chunks = 0;
+  settings->max_text_size = 16777216;
+  settings->max_icc_size = 16777216; /* 16MB is much more than enough for any reasonable ICC profile */
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  settings->ignore_crc = 0;
+  settings->ignore_critical = 0;
+  settings->ignore_end = 0;
+  lodepng_decompress_settings_init(&settings->zlibsettings);
+}
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER)
+
+void lodepng_state_init(LodePNGState* state) {
+#ifdef LODEPNG_COMPILE_DECODER
+  lodepng_decoder_settings_init(&state->decoder);
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+  lodepng_encoder_settings_init(&state->encoder);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+  lodepng_color_mode_init(&state->info_raw);
+  lodepng_info_init(&state->info_png);
+  state->error = 1;
+}
+
+void lodepng_state_cleanup(LodePNGState* state) {
+  lodepng_color_mode_cleanup(&state->info_raw);
+  lodepng_info_cleanup(&state->info_png);
+}
+
+void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source) {
+  lodepng_state_cleanup(dest);
+  *dest = *source;
+  lodepng_color_mode_init(&dest->info_raw);
+  lodepng_info_init(&dest->info_png);
+  dest->error = lodepng_color_mode_copy(&dest->info_raw, &source->info_raw); if(dest->error) return;
+  dest->error = lodepng_info_copy(&dest->info_png, &source->info_png); if(dest->error) return;
+}
+
+#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* / PNG Encoder                                                            / */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+
+static unsigned writeSignature(ucvector* out) {
+  size_t pos = out->size;
+  const unsigned char signature[] = {137, 80, 78, 71, 13, 10, 26, 10};
+  /*8 bytes PNG signature, aka the magic bytes*/
+  if(!ucvector_resize(out, out->size + 8)) return 83; /*alloc fail*/
+  lodepng_memcpy(out->data + pos, signature, 8);
+  return 0;
+}
+
+static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h,
+                              LodePNGColorType colortype, unsigned bitdepth, unsigned interlace_method) {
+  unsigned char *chunk, *data;
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 13, "IHDR"));
+  data = chunk + 8;
+
+  lodepng_set32bitInt(data + 0, w); /*width*/
+  lodepng_set32bitInt(data + 4, h); /*height*/
+  data[8] = (unsigned char)bitdepth; /*bit depth*/
+  data[9] = (unsigned char)colortype; /*color type*/
+  data[10] = 0; /*compression method*/
+  data[11] = 0; /*filter method*/
+  data[12] = interlace_method; /*interlace method*/
+
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+/* only adds the chunk if needed (there is a key or palette with alpha) */
+static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info) {
+  unsigned char* chunk;
+  size_t i, j = 8;
+
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, info->palettesize * 3, "PLTE"));
+
+  for(i = 0; i != info->palettesize; ++i) {
+    /*add all channels except alpha channel*/
+    chunk[j++] = info->palette[i * 4 + 0];
+    chunk[j++] = info->palette[i * 4 + 1];
+    chunk[j++] = info->palette[i * 4 + 2];
+  }
+
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info) {
+  unsigned char* chunk = 0;
+
+  if(info->colortype == LCT_PALETTE) {
+    size_t i, amount = info->palettesize;
+    /*the tail of palette values that all have 255 as alpha, does not have to be encoded*/
+    for(i = info->palettesize; i != 0; --i) {
+      if(info->palette[4 * (i - 1) + 3] != 255) break;
+      --amount;
+    }
+    if(amount) {
+      CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, amount, "tRNS"));
+      /*add the alpha channel values from the palette*/
+      for(i = 0; i != amount; ++i) chunk[8 + i] = info->palette[4 * i + 3];
+    }
+  } else if(info->colortype == LCT_GREY) {
+    if(info->key_defined) {
+      CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 2, "tRNS"));
+      chunk[8] = (unsigned char)(info->key_r >> 8);
+      chunk[9] = (unsigned char)(info->key_r & 255);
+    }
+  } else if(info->colortype == LCT_RGB) {
+    if(info->key_defined) {
+      CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 6, "tRNS"));
+      chunk[8] = (unsigned char)(info->key_r >> 8);
+      chunk[9] = (unsigned char)(info->key_r & 255);
+      chunk[10] = (unsigned char)(info->key_g >> 8);
+      chunk[11] = (unsigned char)(info->key_g & 255);
+      chunk[12] = (unsigned char)(info->key_b >> 8);
+      chunk[13] = (unsigned char)(info->key_b & 255);
+    }
+  }
+
+  if(chunk) lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize,
+                              LodePNGCompressSettings* zlibsettings) {
+  unsigned error = 0;
+  unsigned char* zlib = 0;
+  size_t zlibsize = 0;
+
+  error = zlib_compress(&zlib, &zlibsize, data, datasize, zlibsettings);
+  if(!error) {
+    error = lodepng_chunk_createv(out, zlibsize, "IDAT", zlib);
+  }
+  lodepng_free(zlib);
+  return error;
+}
+
+static unsigned addChunk_IEND(ucvector* out) {
+  return lodepng_chunk_createv(out, 0, "IEND", 0);
+}
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) {
+  unsigned char* chunk = 0;
+  size_t keysize = lodepng_strlen(keyword), textsize = lodepng_strlen(textstring);
+  size_t size = keysize + 1 + textsize;
+  if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, size, "tEXt"));
+  lodepng_memcpy(chunk + 8, keyword, keysize);
+  chunk[8 + keysize] = 0; /*null termination char*/
+  lodepng_memcpy(chunk + 9 + keysize, textstring, textsize);
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring,
+                              LodePNGCompressSettings* zlibsettings) {
+  unsigned error = 0;
+  unsigned char* chunk = 0;
+  unsigned char* compressed = 0;
+  size_t compressedsize = 0;
+  size_t textsize = lodepng_strlen(textstring);
+  size_t keysize = lodepng_strlen(keyword);
+  if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/
+
+  error = zlib_compress(&compressed, &compressedsize,
+                        (const unsigned char*)textstring, textsize, zlibsettings);
+  if(!error) {
+    size_t size = keysize + 2 + compressedsize;
+    error = lodepng_chunk_init(&chunk, out, size, "zTXt");
+  }
+  if(!error) {
+    lodepng_memcpy(chunk + 8, keyword, keysize);
+    chunk[8 + keysize] = 0; /*null termination char*/
+    chunk[9 + keysize] = 0; /*compression method: 0*/
+    lodepng_memcpy(chunk + 10 + keysize, compressed, compressedsize);
+    lodepng_chunk_generate_crc(chunk);
+  }
+
+  lodepng_free(compressed);
+  return error;
+}
+
+static unsigned addChunk_iTXt(ucvector* out, unsigned compress, const char* keyword, const char* langtag,
+                              const char* transkey, const char* textstring, LodePNGCompressSettings* zlibsettings) {
+  unsigned error = 0;
+  unsigned char* chunk = 0;
+  unsigned char* compressed = 0;
+  size_t compressedsize = 0;
+  size_t textsize = lodepng_strlen(textstring);
+  size_t keysize = lodepng_strlen(keyword), langsize = lodepng_strlen(langtag), transsize = lodepng_strlen(transkey);
+
+  if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/
+
+  if(compress) {
+    error = zlib_compress(&compressed, &compressedsize,
+                          (const unsigned char*)textstring, textsize, zlibsettings);
+  }
+  if(!error) {
+    size_t size = keysize + 3 + langsize + 1 + transsize + 1 + (compress ? compressedsize : textsize);
+    error = lodepng_chunk_init(&chunk, out, size, "iTXt");
+  }
+  if(!error) {
+    size_t pos = 8;
+    lodepng_memcpy(chunk + pos, keyword, keysize);
+    pos += keysize;
+    chunk[pos++] = 0; /*null termination char*/
+    chunk[pos++] = (compress ? 1 : 0); /*compression flag*/
+    chunk[pos++] = 0; /*compression method: 0*/
+    lodepng_memcpy(chunk + pos, langtag, langsize);
+    pos += langsize;
+    chunk[pos++] = 0; /*null termination char*/
+    lodepng_memcpy(chunk + pos, transkey, transsize);
+    pos += transsize;
+    chunk[pos++] = 0; /*null termination char*/
+    if(compress) {
+      lodepng_memcpy(chunk + pos, compressed, compressedsize);
+    } else {
+      lodepng_memcpy(chunk + pos, textstring, textsize);
+    }
+    lodepng_chunk_generate_crc(chunk);
+  }
+
+  lodepng_free(compressed);
+  return error;
+}
+
+static unsigned addChunk_bKGD(ucvector* out, const LodePNGInfo* info) {
+  unsigned char* chunk = 0;
+  if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) {
+    CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 2, "bKGD"));
+    chunk[8] = (unsigned char)(info->background_r >> 8);
+    chunk[9] = (unsigned char)(info->background_r & 255);
+  } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) {
+    CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 6, "bKGD"));
+    chunk[8] = (unsigned char)(info->background_r >> 8);
+    chunk[9] = (unsigned char)(info->background_r & 255);
+    chunk[10] = (unsigned char)(info->background_g >> 8);
+    chunk[11] = (unsigned char)(info->background_g & 255);
+    chunk[12] = (unsigned char)(info->background_b >> 8);
+    chunk[13] = (unsigned char)(info->background_b & 255);
+  } else if(info->color.colortype == LCT_PALETTE) {
+    CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 1, "bKGD"));
+    chunk[8] = (unsigned char)(info->background_r & 255); /*palette index*/
+  }
+  if(chunk) lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time) {
+  unsigned char* chunk;
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 7, "tIME"));
+  chunk[8] = (unsigned char)(time->year >> 8);
+  chunk[9] = (unsigned char)(time->year & 255);
+  chunk[10] = (unsigned char)time->month;
+  chunk[11] = (unsigned char)time->day;
+  chunk[12] = (unsigned char)time->hour;
+  chunk[13] = (unsigned char)time->minute;
+  chunk[14] = (unsigned char)time->second;
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_pHYs(ucvector* out, const LodePNGInfo* info) {
+  unsigned char* chunk;
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 9, "pHYs"));
+  lodepng_set32bitInt(chunk + 8, info->phys_x);
+  lodepng_set32bitInt(chunk + 12, info->phys_y);
+  chunk[16] = info->phys_unit;
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_gAMA(ucvector* out, const LodePNGInfo* info) {
+  unsigned char* chunk;
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 4, "gAMA"));
+  lodepng_set32bitInt(chunk + 8, info->gama_gamma);
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_cHRM(ucvector* out, const LodePNGInfo* info) {
+  unsigned char* chunk;
+  CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 32, "cHRM"));
+  lodepng_set32bitInt(chunk + 8, info->chrm_white_x);
+  lodepng_set32bitInt(chunk + 12, info->chrm_white_y);
+  lodepng_set32bitInt(chunk + 16, info->chrm_red_x);
+  lodepng_set32bitInt(chunk + 20, info->chrm_red_y);
+  lodepng_set32bitInt(chunk + 24, info->chrm_green_x);
+  lodepng_set32bitInt(chunk + 28, info->chrm_green_y);
+  lodepng_set32bitInt(chunk + 32, info->chrm_blue_x);
+  lodepng_set32bitInt(chunk + 36, info->chrm_blue_y);
+  lodepng_chunk_generate_crc(chunk);
+  return 0;
+}
+
+static unsigned addChunk_sRGB(ucvector* out, const LodePNGInfo* info) {
+  unsigned char data = info->srgb_intent;
+  return lodepng_chunk_createv(out, 1, "sRGB", &data);
+}
+
+static unsigned addChunk_iCCP(ucvector* out, const LodePNGInfo* info, LodePNGCompressSettings* zlibsettings) {
+  unsigned error = 0;
+  unsigned char* chunk = 0;
+  unsigned char* compressed = 0;
+  size_t compressedsize = 0;
+  size_t keysize = lodepng_strlen(info->iccp_name);
+
+  if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/
+  error = zlib_compress(&compressed, &compressedsize,
+                        info->iccp_profile, info->iccp_profile_size, zlibsettings);
+  if(!error) {
+    size_t size = keysize + 2 + compressedsize;
+    error = lodepng_chunk_init(&chunk, out, size, "iCCP");
+  }
+  if(!error) {
+    lodepng_memcpy(chunk + 8, info->iccp_name, keysize);
+    chunk[8 + keysize] = 0; /*null termination char*/
+    chunk[9 + keysize] = 0; /*compression method: 0*/
+    lodepng_memcpy(chunk + 10 + keysize, compressed, compressedsize);
+    lodepng_chunk_generate_crc(chunk);
+  }
+
+  lodepng_free(compressed);
+  return error;
+}
+
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline,
+                           size_t length, size_t bytewidth, unsigned char filterType) {
+  size_t i;
+  switch(filterType) {
+    case 0: /*None*/
+      for(i = 0; i != length; ++i) out[i] = scanline[i];
+      break;
+    case 1: /*Sub*/
+      for(i = 0; i != bytewidth; ++i) out[i] = scanline[i];
+      for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - scanline[i - bytewidth];
+      break;
+    case 2: /*Up*/
+      if(prevline) {
+        for(i = 0; i != length; ++i) out[i] = scanline[i] - prevline[i];
+      } else {
+        for(i = 0; i != length; ++i) out[i] = scanline[i];
+      }
+      break;
+    case 3: /*Average*/
+      if(prevline) {
+        for(i = 0; i != bytewidth; ++i) out[i] = scanline[i] - (prevline[i] >> 1);
+        for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) >> 1);
+      } else {
+        for(i = 0; i != bytewidth; ++i) out[i] = scanline[i];
+        for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - (scanline[i - bytewidth] >> 1);
+      }
+      break;
+    case 4: /*Paeth*/
+      if(prevline) {
+        /*paethPredictor(0, prevline[i], 0) is always prevline[i]*/
+        for(i = 0; i != bytewidth; ++i) out[i] = (scanline[i] - prevline[i]);
+        for(i = bytewidth; i < length; ++i) {
+          out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth]));
+        }
+      } else {
+        for(i = 0; i != bytewidth; ++i) out[i] = scanline[i];
+        /*paethPredictor(scanline[i - bytewidth], 0, 0) is always scanline[i - bytewidth]*/
+        for(i = bytewidth; i < length; ++i) out[i] = (scanline[i] - scanline[i - bytewidth]);
+      }
+      break;
+    default: return; /*invalid filter type given*/
+  }
+}
+
+/* integer binary logarithm, max return value is 31 */
+static size_t ilog2(size_t i) {
+  size_t result = 0;
+  if(i >= 65536) { result += 16; i >>= 16; }
+  if(i >= 256) { result += 8; i >>= 8; }
+  if(i >= 16) { result += 4; i >>= 4; }
+  if(i >= 4) { result += 2; i >>= 2; }
+  if(i >= 2) { result += 1; /*i >>= 1;*/ }
+  return result;
+}
+
+/* integer approximation for i * log2(i), helper function for LFS_ENTROPY */
+static size_t ilog2i(size_t i) {
+  size_t l;
+  if(i == 0) return 0;
+  l = ilog2(i);
+  /* approximate i*log2(i): l is integer logarithm, ((i - (1u << l)) << 1u)
+  linearly approximates the missing fractional part multiplied by i */
+  return i * l + ((i - (1u << l)) << 1u);
+}
+
+static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h,
+                       const LodePNGColorMode* color, const LodePNGEncoderSettings* settings) {
+  /*
+  For PNG filter method 0
+  out must be a buffer with as size: h + (w * h * bpp + 7u) / 8u, because there are
+  the scanlines with 1 extra byte per scanline
+  */
+
+  unsigned bpp = lodepng_get_bpp(color);
+  /*the width of a scanline in bytes, not including the filter type*/
+  size_t linebytes = lodepng_get_raw_size_idat(w, 1, bpp) - 1u;
+
+  /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/
+  size_t bytewidth = (bpp + 7u) / 8u;
+  const unsigned char* prevline = 0;
+  unsigned x, y;
+  unsigned error = 0;
+  LodePNGFilterStrategy strategy = settings->filter_strategy;
+
+  /*
+  There is a heuristic called the minimum sum of absolute differences heuristic, suggested by the PNG standard:
+   *  If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e.
+      use fixed filtering, with the filter None).
+   * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is
+     not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply
+     all five filters and select the filter that produces the smallest sum of absolute values per row.
+  This heuristic is used if filter strategy is LFS_MINSUM and filter_palette_zero is true.
+
+  If filter_palette_zero is true and filter_strategy is not LFS_MINSUM, the above heuristic is followed,
+  but for "the other case", whatever strategy filter_strategy is set to instead of the minimum sum
+  heuristic is used.
+  */
+  if(settings->filter_palette_zero &&
+     (color->colortype == LCT_PALETTE || color->bitdepth < 8)) strategy = LFS_ZERO;
+
+  if(bpp == 0) return 31; /*error: invalid color type*/
+
+  if(strategy >= LFS_ZERO && strategy <= LFS_FOUR) {
+    unsigned char type = (unsigned char)strategy;
+    for(y = 0; y != h; ++y) {
+      size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
+      size_t inindex = linebytes * y;
+      out[outindex] = type; /*filter type byte*/
+      filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type);
+      prevline = &in[inindex];
+    }
+  } else if(strategy == LFS_MINSUM) {
+    /*adaptive filtering*/
+    unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/
+    size_t smallest = 0;
+    unsigned char type, bestType = 0;
+
+    for(type = 0; type != 5; ++type) {
+      attempt[type] = (unsigned char*)lodepng_malloc(linebytes);
+      if(!attempt[type]) error = 83; /*alloc fail*/
+    }
+
+    if(!error) {
+      for(y = 0; y != h; ++y) {
+        /*try the 5 filter types*/
+        for(type = 0; type != 5; ++type) {
+          size_t sum = 0;
+          filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type);
+
+          /*calculate the sum of the result*/
+          if(type == 0) {
+            for(x = 0; x != linebytes; ++x) sum += (unsigned char)(attempt[type][x]);
+          } else {
+            for(x = 0; x != linebytes; ++x) {
+              /*For differences, each byte should be treated as signed, values above 127 are negative
+              (converted to signed char). Filtertype 0 isn't a difference though, so use unsigned there.
+              This means filtertype 0 is almost never chosen, but that is justified.*/
+              unsigned char s = attempt[type][x];
+              sum += s < 128 ? s : (255U - s);
+            }
+          }
+
+          /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/
+          if(type == 0 || sum < smallest) {
+            bestType = type;
+            smallest = sum;
+          }
+        }
+
+        prevline = &in[y * linebytes];
+
+        /*now fill the out values*/
+        out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
+        for(x = 0; x != linebytes; ++x) out[y * (linebytes + 1) + 1 + x] = attempt[bestType][x];
+      }
+    }
+
+    for(type = 0; type != 5; ++type) lodepng_free(attempt[type]);
+  } else if(strategy == LFS_ENTROPY) {
+    unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/
+    size_t bestSum = 0;
+    unsigned type, bestType = 0;
+    unsigned count[256];
+
+    for(type = 0; type != 5; ++type) {
+      attempt[type] = (unsigned char*)lodepng_malloc(linebytes);
+      if(!attempt[type]) error = 83; /*alloc fail*/
+    }
+
+    if(!error) {
+      for(y = 0; y != h; ++y) {
+        /*try the 5 filter types*/
+        for(type = 0; type != 5; ++type) {
+          size_t sum = 0;
+          filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type);
+          lodepng_memset(count, 0, 256 * sizeof(*count));
+          for(x = 0; x != linebytes; ++x) ++count[attempt[type][x]];
+          ++count[type]; /*the filter type itself is part of the scanline*/
+          for(x = 0; x != 256; ++x) {
+            sum += ilog2i(count[x]);
+          }
+          /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/
+          if(type == 0 || sum > bestSum) {
+            bestType = type;
+            bestSum = sum;
+          }
+        }
+
+        prevline = &in[y * linebytes];
+
+        /*now fill the out values*/
+        out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
+        for(x = 0; x != linebytes; ++x) out[y * (linebytes + 1) + 1 + x] = attempt[bestType][x];
+      }
+    }
+
+    for(type = 0; type != 5; ++type) lodepng_free(attempt[type]);
+  } else if(strategy == LFS_PREDEFINED) {
+    for(y = 0; y != h; ++y) {
+      size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/
+      size_t inindex = linebytes * y;
+      unsigned char type = settings->predefined_filters[y];
+      out[outindex] = type; /*filter type byte*/
+      filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type);
+      prevline = &in[inindex];
+    }
+  } else if(strategy == LFS_BRUTE_FORCE) {
+    /*brute force filter chooser.
+    deflate the scanline after every filter attempt to see which one deflates best.
+    This is very slow and gives only slightly smaller, sometimes even larger, result*/
+    size_t size[5];
+    unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/
+    size_t smallest = 0;
+    unsigned type = 0, bestType = 0;
+    unsigned char* dummy;
+    LodePNGCompressSettings zlibsettings;
+    lodepng_memcpy(&zlibsettings, &settings->zlibsettings, sizeof(LodePNGCompressSettings));
+    /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose,
+    to simulate the true case where the tree is the same for the whole image. Sometimes it gives
+    better result with dynamic tree anyway. Using the fixed tree sometimes gives worse, but in rare
+    cases better compression. It does make this a bit less slow, so it's worth doing this.*/
+    zlibsettings.btype = 1;
+    /*a custom encoder likely doesn't read the btype setting and is optimized for complete PNG
+    images only, so disable it*/
+    zlibsettings.custom_zlib = 0;
+    zlibsettings.custom_deflate = 0;
+    for(type = 0; type != 5; ++type) {
+      attempt[type] = (unsigned char*)lodepng_malloc(linebytes);
+      if(!attempt[type]) error = 83; /*alloc fail*/
+    }
+    if(!error) {
+      for(y = 0; y != h; ++y) /*try the 5 filter types*/ {
+        for(type = 0; type != 5; ++type) {
+          unsigned testsize = (unsigned)linebytes;
+          /*if(testsize > 8) testsize /= 8;*/ /*it already works good enough by testing a part of the row*/
+
+          filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type);
+          size[type] = 0;
+          dummy = 0;
+          zlib_compress(&dummy, &size[type], attempt[type], testsize, &zlibsettings);
+          lodepng_free(dummy);
+          /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/
+          if(type == 0 || size[type] < smallest) {
+            bestType = type;
+            smallest = size[type];
+          }
+        }
+        prevline = &in[y * linebytes];
+        out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/
+        for(x = 0; x != linebytes; ++x) out[y * (linebytes + 1) + 1 + x] = attempt[bestType][x];
+      }
+    }
+    for(type = 0; type != 5; ++type) lodepng_free(attempt[type]);
+  }
+  else return 88; /* unknown filter strategy */
+
+  return error;
+}
+
+static void addPaddingBits(unsigned char* out, const unsigned char* in,
+                           size_t olinebits, size_t ilinebits, unsigned h) {
+  /*The opposite of the removePaddingBits function
+  olinebits must be >= ilinebits*/
+  unsigned y;
+  size_t diff = olinebits - ilinebits;
+  size_t obp = 0, ibp = 0; /*bit pointers*/
+  for(y = 0; y != h; ++y) {
+    size_t x;
+    for(x = 0; x < ilinebits; ++x) {
+      unsigned char bit = readBitFromReversedStream(&ibp, in);
+      setBitOfReversedStream(&obp, out, bit);
+    }
+    /*obp += diff; --> no, fill in some value in the padding bits too, to avoid
+    "Use of uninitialised value of size ###" warning from valgrind*/
+    for(x = 0; x != diff; ++x) setBitOfReversedStream(&obp, out, 0);
+  }
+}
+
+/*
+in: non-interlaced image with size w*h
+out: the same pixels, but re-ordered according to PNG's Adam7 interlacing, with
+ no padding bits between scanlines, but between reduced images so that each
+ reduced image starts at a byte.
+bpp: bits per pixel
+there are no padding bits, not between scanlines, not between reduced images
+in has the following size in bits: w * h * bpp.
+out is possibly bigger due to padding bits between reduced images
+NOTE: comments about padding bits are only relevant if bpp < 8
+*/
+static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) {
+  unsigned passw[7], passh[7];
+  size_t filter_passstart[8], padded_passstart[8], passstart[8];
+  unsigned i;
+
+  Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+  if(bpp >= 8) {
+    for(i = 0; i != 7; ++i) {
+      unsigned x, y, b;
+      size_t bytewidth = bpp / 8u;
+      for(y = 0; y < passh[i]; ++y)
+      for(x = 0; x < passw[i]; ++x) {
+        size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth;
+        size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth;
+        for(b = 0; b < bytewidth; ++b) {
+          out[pixeloutstart + b] = in[pixelinstart + b];
+        }
+      }
+    }
+  } else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ {
+    for(i = 0; i != 7; ++i) {
+      unsigned x, y, b;
+      unsigned ilinebits = bpp * passw[i];
+      unsigned olinebits = bpp * w;
+      size_t obp, ibp; /*bit pointers (for out and in buffer)*/
+      for(y = 0; y < passh[i]; ++y)
+      for(x = 0; x < passw[i]; ++x) {
+        ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp;
+        obp = (8 * passstart[i]) + (y * ilinebits + x * bpp);
+        for(b = 0; b < bpp; ++b) {
+          unsigned char bit = readBitFromReversedStream(&ibp, in);
+          setBitOfReversedStream(&obp, out, bit);
+        }
+      }
+    }
+  }
+}
+
+/*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image.
+return value is error**/
+static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in,
+                                    unsigned w, unsigned h,
+                                    const LodePNGInfo* info_png, const LodePNGEncoderSettings* settings) {
+  /*
+  This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps:
+  *) if no Adam7: 1) add padding bits (= possible extra bits per scanline if bpp < 8) 2) filter
+  *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter
+  */
+  unsigned bpp = lodepng_get_bpp(&info_png->color);
+  unsigned error = 0;
+
+  if(info_png->interlace_method == 0) {
+    *outsize = h + (h * ((w * bpp + 7u) / 8u)); /*image size plus an extra byte per scanline + possible padding bits*/
+    *out = (unsigned char*)lodepng_malloc(*outsize);
+    if(!(*out) && (*outsize)) error = 83; /*alloc fail*/
+
+    if(!error) {
+      /*non multiple of 8 bits per scanline, padding bits needed per scanline*/
+      if(bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) {
+        unsigned char* padded = (unsigned char*)lodepng_malloc(h * ((w * bpp + 7u) / 8u));
+        if(!padded) error = 83; /*alloc fail*/
+        if(!error) {
+          addPaddingBits(padded, in, ((w * bpp + 7u) / 8u) * 8u, w * bpp, h);
+          error = filter(*out, padded, w, h, &info_png->color, settings);
+        }
+        lodepng_free(padded);
+      } else {
+        /*we can immediately filter into the out buffer, no other steps needed*/
+        error = filter(*out, in, w, h, &info_png->color, settings);
+      }
+    }
+  } else /*interlace_method is 1 (Adam7)*/ {
+    unsigned passw[7], passh[7];
+    size_t filter_passstart[8], padded_passstart[8], passstart[8];
+    unsigned char* adam7;
+
+    Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp);
+
+    *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/
+    *out = (unsigned char*)lodepng_malloc(*outsize);
+    if(!(*out)) error = 83; /*alloc fail*/
+
+    adam7 = (unsigned char*)lodepng_malloc(passstart[7]);
+    if(!adam7 && passstart[7]) error = 83; /*alloc fail*/
+
+    if(!error) {
+      unsigned i;
+
+      Adam7_interlace(adam7, in, w, h, bpp);
+      for(i = 0; i != 7; ++i) {
+        if(bpp < 8) {
+          unsigned char* padded = (unsigned char*)lodepng_malloc(padded_passstart[i + 1] - padded_passstart[i]);
+          if(!padded) ERROR_BREAK(83); /*alloc fail*/
+          addPaddingBits(padded, &adam7[passstart[i]],
+                         ((passw[i] * bpp + 7u) / 8u) * 8u, passw[i] * bpp, passh[i]);
+          error = filter(&(*out)[filter_passstart[i]], padded,
+                         passw[i], passh[i], &info_png->color, settings);
+          lodepng_free(padded);
+        } else {
+          error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]],
+                         passw[i], passh[i], &info_png->color, settings);
+        }
+
+        if(error) break;
+      }
+    }
+
+    lodepng_free(adam7);
+  }
+
+  return error;
+}
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) {
+  unsigned char* inchunk = data;
+  while((size_t)(inchunk - data) < datasize) {
+    CERROR_TRY_RETURN(lodepng_chunk_append(&out->data, &out->size, inchunk));
+    out->allocsize = out->size; /*fix the allocsize again*/
+    inchunk = lodepng_chunk_next(inchunk, data + datasize);
+  }
+  return 0;
+}
+
+static unsigned isGrayICCProfile(const unsigned char* profile, unsigned size) {
+  /*
+  It is a gray profile if bytes 16-19 are "GRAY", rgb profile if bytes 16-19
+  are "RGB ". We do not perform any full parsing of the ICC profile here, other
+  than check those 4 bytes to grayscale profile. Other than that, validity of
+  the profile is not checked. This is needed only because the PNG specification
+  requires using a non-gray color model if there is an ICC profile with "RGB "
+  (sadly limiting compression opportunities if the input data is grayscale RGB
+  data), and requires using a gray color model if it is "GRAY".
+  */
+  if(size < 20) return 0;
+  return profile[16] == 'G' &&  profile[17] == 'R' &&  profile[18] == 'A' &&  profile[19] == 'Y';
+}
+
+static unsigned isRGBICCProfile(const unsigned char* profile, unsigned size) {
+  /* See comment in isGrayICCProfile*/
+  if(size < 20) return 0;
+  return profile[16] == 'R' &&  profile[17] == 'G' &&  profile[18] == 'B' &&  profile[19] == ' ';
+}
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+unsigned lodepng_encode(unsigned char** out, size_t* outsize,
+                        const unsigned char* image, unsigned w, unsigned h,
+                        LodePNGState* state) {
+  unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/
+  size_t datasize = 0;
+  ucvector outv = ucvector_init(NULL, 0);
+  LodePNGInfo info;
+  const LodePNGInfo* info_png = &state->info_png;
+
+  lodepng_info_init(&info);
+
+  /*provide some proper output values if error will happen*/
+  *out = 0;
+  *outsize = 0;
+  state->error = 0;
+
+  /*check input values validity*/
+  if((info_png->color.colortype == LCT_PALETTE || state->encoder.force_palette)
+      && (info_png->color.palettesize == 0 || info_png->color.palettesize > 256)) {
+    state->error = 68; /*invalid palette size, it is only allowed to be 1-256*/
+    goto cleanup;
+  }
+  if(state->encoder.zlibsettings.btype > 2) {
+    state->error = 61; /*error: invalid btype*/
+    goto cleanup;
+  }
+  if(info_png->interlace_method > 1) {
+    state->error = 71; /*error: invalid interlace mode*/
+    goto cleanup;
+  }
+  state->error = checkColorValidity(info_png->color.colortype, info_png->color.bitdepth);
+  if(state->error) goto cleanup; /*error: invalid color type given*/
+  state->error = checkColorValidity(state->info_raw.colortype, state->info_raw.bitdepth);
+  if(state->error) goto cleanup; /*error: invalid color type given*/
+
+  /* color convert and compute scanline filter types */
+  lodepng_info_copy(&info, &state->info_png);
+  if(state->encoder.auto_convert) {
+    LodePNGColorStats stats;
+    lodepng_color_stats_init(&stats);
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    if(info_png->iccp_defined &&
+        isGrayICCProfile(info_png->iccp_profile, info_png->iccp_profile_size)) {
+      /*the PNG specification does not allow to use palette with a GRAY ICC profile, even
+      if the palette has only gray colors, so disallow it.*/
+      stats.allow_palette = 0;
+    }
+    if(info_png->iccp_defined &&
+        isRGBICCProfile(info_png->iccp_profile, info_png->iccp_profile_size)) {
+      /*the PNG specification does not allow to use grayscale color with RGB ICC profile, so disallow gray.*/
+      stats.allow_greyscale = 0;
+    }
+#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */
+    state->error = lodepng_compute_color_stats(&stats, image, w, h, &state->info_raw);
+    if(state->error) goto cleanup;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    if(info_png->background_defined) {
+      /*the background chunk's color must be taken into account as well*/
+      unsigned r = 0, g = 0, b = 0;
+      LodePNGColorMode mode16 = lodepng_color_mode_make(LCT_RGB, 16);
+      lodepng_convert_rgb(&r, &g, &b, info_png->background_r, info_png->background_g, info_png->background_b, &mode16, &info_png->color);
+      state->error = lodepng_color_stats_add(&stats, r, g, b, 65535);
+      if(state->error) goto cleanup;
+    }
+#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */
+    state->error = auto_choose_color(&info.color, &state->info_raw, &stats);
+    if(state->error) goto cleanup;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*also convert the background chunk*/
+    if(info_png->background_defined) {
+      if(lodepng_convert_rgb(&info.background_r, &info.background_g, &info.background_b,
+          info_png->background_r, info_png->background_g, info_png->background_b, &info.color, &info_png->color)) {
+        state->error = 104;
+        goto cleanup;
+      }
+    }
+#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */
+  }
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  if(info_png->iccp_defined) {
+    unsigned gray_icc = isGrayICCProfile(info_png->iccp_profile, info_png->iccp_profile_size);
+    unsigned rgb_icc = isRGBICCProfile(info_png->iccp_profile, info_png->iccp_profile_size);
+    unsigned gray_png = info.color.colortype == LCT_GREY || info.color.colortype == LCT_GREY_ALPHA;
+    if(!gray_icc && !rgb_icc) {
+      state->error = 100; /* Disallowed profile color type for PNG */
+      goto cleanup;
+    }
+    if(gray_icc != gray_png) {
+      /*Not allowed to use RGB/RGBA/palette with GRAY ICC profile or vice versa,
+      or in case of auto_convert, it wasn't possible to find appropriate model*/
+      state->error = state->encoder.auto_convert ? 102 : 101;
+      goto cleanup;
+    }
+  }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+  if(!lodepng_color_mode_equal(&state->info_raw, &info.color)) {
+    unsigned char* converted;
+    size_t size = ((size_t)w * (size_t)h * (size_t)lodepng_get_bpp(&info.color) + 7u) / 8u;
+
+    converted = (unsigned char*)lodepng_malloc(size);
+    if(!converted && size) state->error = 83; /*alloc fail*/
+    if(!state->error) {
+      state->error = lodepng_convert(converted, image, &info.color, &state->info_raw, w, h);
+    }
+    if(!state->error) {
+      state->error = preProcessScanlines(&data, &datasize, converted, w, h, &info, &state->encoder);
+    }
+    lodepng_free(converted);
+    if(state->error) goto cleanup;
+  } else {
+    state->error = preProcessScanlines(&data, &datasize, image, w, h, &info, &state->encoder);
+    if(state->error) goto cleanup;
+  }
+
+  /* output all PNG chunks */ {
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    size_t i;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*write signature and chunks*/
+    state->error = writeSignature(&outv);
+    if(state->error) goto cleanup;
+    /*IHDR*/
+    state->error = addChunk_IHDR(&outv, w, h, info.color.colortype, info.color.bitdepth, info.interlace_method);
+    if(state->error) goto cleanup;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*unknown chunks between IHDR and PLTE*/
+    if(info.unknown_chunks_data[0]) {
+      state->error = addUnknownChunks(&outv, info.unknown_chunks_data[0], info.unknown_chunks_size[0]);
+      if(state->error) goto cleanup;
+    }
+    /*color profile chunks must come before PLTE */
+    if(info.iccp_defined) {
+      state->error = addChunk_iCCP(&outv, &info, &state->encoder.zlibsettings);
+      if(state->error) goto cleanup;
+    }
+    if(info.srgb_defined) {
+      state->error = addChunk_sRGB(&outv, &info);
+      if(state->error) goto cleanup;
+    }
+    if(info.gama_defined) {
+      state->error = addChunk_gAMA(&outv, &info);
+      if(state->error) goto cleanup;
+    }
+    if(info.chrm_defined) {
+      state->error = addChunk_cHRM(&outv, &info);
+      if(state->error) goto cleanup;
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*PLTE*/
+    if(info.color.colortype == LCT_PALETTE) {
+      state->error = addChunk_PLTE(&outv, &info.color);
+      if(state->error) goto cleanup;
+    }
+    if(state->encoder.force_palette && (info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA)) {
+      /*force_palette means: write suggested palette for truecolor in PLTE chunk*/
+      state->error = addChunk_PLTE(&outv, &info.color);
+      if(state->error) goto cleanup;
+    }
+    /*tRNS (this will only add if when necessary) */
+    state->error = addChunk_tRNS(&outv, &info.color);
+    if(state->error) goto cleanup;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*bKGD (must come between PLTE and the IDAt chunks*/
+    if(info.background_defined) {
+      state->error = addChunk_bKGD(&outv, &info);
+      if(state->error) goto cleanup;
+    }
+    /*pHYs (must come before the IDAT chunks)*/
+    if(info.phys_defined) {
+      state->error = addChunk_pHYs(&outv, &info);
+      if(state->error) goto cleanup;
+    }
+
+    /*unknown chunks between PLTE and IDAT*/
+    if(info.unknown_chunks_data[1]) {
+      state->error = addUnknownChunks(&outv, info.unknown_chunks_data[1], info.unknown_chunks_size[1]);
+      if(state->error) goto cleanup;
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    /*IDAT (multiple IDAT chunks must be consecutive)*/
+    state->error = addChunk_IDAT(&outv, data, datasize, &state->encoder.zlibsettings);
+    if(state->error) goto cleanup;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    /*tIME*/
+    if(info.time_defined) {
+      state->error = addChunk_tIME(&outv, &info.time);
+      if(state->error) goto cleanup;
+    }
+    /*tEXt and/or zTXt*/
+    for(i = 0; i != info.text_num; ++i) {
+      if(lodepng_strlen(info.text_keys[i]) > 79) {
+        state->error = 66; /*text chunk too large*/
+        goto cleanup;
+      }
+      if(lodepng_strlen(info.text_keys[i]) < 1) {
+        state->error = 67; /*text chunk too small*/
+        goto cleanup;
+      }
+      if(state->encoder.text_compression) {
+        state->error = addChunk_zTXt(&outv, info.text_keys[i], info.text_strings[i], &state->encoder.zlibsettings);
+        if(state->error) goto cleanup;
+      } else {
+        state->error = addChunk_tEXt(&outv, info.text_keys[i], info.text_strings[i]);
+        if(state->error) goto cleanup;
+      }
+    }
+    /*LodePNG version id in text chunk*/
+    if(state->encoder.add_id) {
+      unsigned already_added_id_text = 0;
+      for(i = 0; i != info.text_num; ++i) {
+        const char* k = info.text_keys[i];
+        /* Could use strcmp, but we're not calling or reimplementing this C library function for this use only */
+        if(k[0] == 'L' && k[1] == 'o' && k[2] == 'd' && k[3] == 'e' &&
+           k[4] == 'P' && k[5] == 'N' && k[6] == 'G' && k[7] == '\0') {
+          already_added_id_text = 1;
+          break;
+        }
+      }
+      if(already_added_id_text == 0) {
+        state->error = addChunk_tEXt(&outv, "LodePNG", LODEPNG_VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/
+        if(state->error) goto cleanup;
+      }
+    }
+    /*iTXt*/
+    for(i = 0; i != info.itext_num; ++i) {
+      if(lodepng_strlen(info.itext_keys[i]) > 79) {
+        state->error = 66; /*text chunk too large*/
+        goto cleanup;
+      }
+      if(lodepng_strlen(info.itext_keys[i]) < 1) {
+        state->error = 67; /*text chunk too small*/
+        goto cleanup;
+      }
+      state->error = addChunk_iTXt(
+          &outv, state->encoder.text_compression,
+          info.itext_keys[i], info.itext_langtags[i], info.itext_transkeys[i], info.itext_strings[i],
+          &state->encoder.zlibsettings);
+      if(state->error) goto cleanup;
+    }
+
+    /*unknown chunks between IDAT and IEND*/
+    if(info.unknown_chunks_data[2]) {
+      state->error = addUnknownChunks(&outv, info.unknown_chunks_data[2], info.unknown_chunks_size[2]);
+      if(state->error) goto cleanup;
+    }
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+    state->error = addChunk_IEND(&outv);
+    if(state->error) goto cleanup;
+  }
+
+cleanup:
+  lodepng_info_cleanup(&info);
+  lodepng_free(data);
+
+  /*instead of cleaning the vector up, give it to the output*/
+  *out = outv.data;
+  *outsize = outv.size;
+
+  return state->error;
+}
+
+unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, const unsigned char* image,
+                               unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) {
+  unsigned error;
+  LodePNGState state;
+  lodepng_state_init(&state);
+  state.info_raw.colortype = colortype;
+  state.info_raw.bitdepth = bitdepth;
+  state.info_png.color.colortype = colortype;
+  state.info_png.color.bitdepth = bitdepth;
+  lodepng_encode(out, outsize, image, w, h, &state);
+  error = state.error;
+  lodepng_state_cleanup(&state);
+  return error;
+}
+
+unsigned lodepng_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) {
+  return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGBA, 8);
+}
+
+unsigned lodepng_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) {
+  return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGB, 8);
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned lodepng_encode_file(const char* filename, const unsigned char* image, unsigned w, unsigned h,
+                             LodePNGColorType colortype, unsigned bitdepth) {
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error = lodepng_encode_memory(&buffer, &buffersize, image, w, h, colortype, bitdepth);
+  if(!error) error = lodepng_save_file(buffer, buffersize, filename);
+  lodepng_free(buffer);
+  return error;
+}
+
+unsigned lodepng_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) {
+  return lodepng_encode_file(filename, image, w, h, LCT_RGBA, 8);
+}
+
+unsigned lodepng_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) {
+  return lodepng_encode_file(filename, image, w, h, LCT_RGB, 8);
+}
+#endif /*LODEPNG_COMPILE_DISK*/
+
+void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings) {
+  lodepng_compress_settings_init(&settings->zlibsettings);
+  settings->filter_palette_zero = 1;
+  settings->filter_strategy = LFS_MINSUM;
+  settings->auto_convert = 1;
+  settings->force_palette = 0;
+  settings->predefined_filters = 0;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  settings->add_id = 0;
+  settings->text_compression = 1;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+}
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ERROR_TEXT
+/*
+This returns the description of a numerical error code in English. This is also
+the documentation of all the error codes.
+*/
+const char* lodepng_error_text(unsigned code) {
+  switch(code) {
+    case 0: return "no error, everything went ok";
+    case 1: return "nothing done yet"; /*the Encoder/Decoder has done nothing yet, error checking makes no sense yet*/
+    case 10: return "end of input memory reached without huffman end code"; /*while huffman decoding*/
+    case 11: return "error in code tree made it jump outside of huffman tree"; /*while huffman decoding*/
+    case 13: return "problem while processing dynamic deflate block";
+    case 14: return "problem while processing dynamic deflate block";
+    case 15: return "problem while processing dynamic deflate block";
+    /*this error could happen if there are only 0 or 1 symbols present in the huffman code:*/
+    case 16: return "invalid code while processing dynamic deflate block";
+    case 17: return "end of out buffer memory reached while inflating";
+    case 18: return "invalid distance code while inflating";
+    case 19: return "end of out buffer memory reached while inflating";
+    case 20: return "invalid deflate block BTYPE encountered while decoding";
+    case 21: return "NLEN is not ones complement of LEN in a deflate block";
+
+    /*end of out buffer memory reached while inflating:
+    This can happen if the inflated deflate data is longer than the amount of bytes required to fill up
+    all the pixels of the image, given the color depth and image dimensions. Something that doesn't
+    happen in a normal, well encoded, PNG image.*/
+    case 22: return "end of out buffer memory reached while inflating";
+    case 23: return "end of in buffer memory reached while inflating";
+    case 24: return "invalid FCHECK in zlib header";
+    case 25: return "invalid compression method in zlib header";
+    case 26: return "FDICT encountered in zlib header while it's not used for PNG";
+    case 27: return "PNG file is smaller than a PNG header";
+    /*Checks the magic file header, the first 8 bytes of the PNG file*/
+    case 28: return "incorrect PNG signature, it's no PNG or corrupted";
+    case 29: return "first chunk is not the header chunk";
+    case 30: return "chunk length too large, chunk broken off at end of file";
+    case 31: return "illegal PNG color type or bpp";
+    case 32: return "illegal PNG compression method";
+    case 33: return "illegal PNG filter method";
+    case 34: return "illegal PNG interlace method";
+    case 35: return "chunk length of a chunk is too large or the chunk too small";
+    case 36: return "illegal PNG filter type encountered";
+    case 37: return "illegal bit depth for this color type given";
+    case 38: return "the palette is too small or too big"; /*0, or more than 256 colors*/
+    case 39: return "tRNS chunk before PLTE or has more entries than palette size";
+    case 40: return "tRNS chunk has wrong size for grayscale image";
+    case 41: return "tRNS chunk has wrong size for RGB image";
+    case 42: return "tRNS chunk appeared while it was not allowed for this color type";
+    case 43: return "bKGD chunk has wrong size for palette image";
+    case 44: return "bKGD chunk has wrong size for grayscale image";
+    case 45: return "bKGD chunk has wrong size for RGB image";
+    case 48: return "empty input buffer given to decoder. Maybe caused by non-existing file?";
+    case 49: return "jumped past memory while generating dynamic huffman tree";
+    case 50: return "jumped past memory while generating dynamic huffman tree";
+    case 51: return "jumped past memory while inflating huffman block";
+    case 52: return "jumped past memory while inflating";
+    case 53: return "size of zlib data too small";
+    case 54: return "repeat symbol in tree while there was no value symbol yet";
+    /*jumped past tree while generating huffman tree, this could be when the
+    tree will have more leaves than symbols after generating it out of the
+    given lengths. They call this an oversubscribed dynamic bit lengths tree in zlib.*/
+    case 55: return "jumped past tree while generating huffman tree";
+    case 56: return "given output image colortype or bitdepth not supported for color conversion";
+    case 57: return "invalid CRC encountered (checking CRC can be disabled)";
+    case 58: return "invalid ADLER32 encountered (checking ADLER32 can be disabled)";
+    case 59: return "requested color conversion not supported";
+    case 60: return "invalid window size given in the settings of the encoder (must be 0-32768)";
+    case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)";
+    /*LodePNG leaves the choice of RGB to grayscale conversion formula to the user.*/
+    case 62: return "conversion from color to grayscale not supported";
+    /*(2^31-1)*/
+    case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk";
+    /*this would result in the inability of a deflated block to ever contain an end code. It must be at least 1.*/
+    case 64: return "the length of the END symbol 256 in the Huffman tree is 0";
+    case 66: return "the length of a text chunk keyword given to the encoder is longer than the maximum of 79 bytes";
+    case 67: return "the length of a text chunk keyword given to the encoder is smaller than the minimum of 1 byte";
+    case 68: return "tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors";
+    case 69: return "unknown chunk type with 'critical' flag encountered by the decoder";
+    case 71: return "invalid interlace mode given to encoder (must be 0 or 1)";
+    case 72: return "while decoding, invalid compression method encountering in zTXt or iTXt chunk (it must be 0)";
+    case 73: return "invalid tIME chunk size";
+    case 74: return "invalid pHYs chunk size";
+    /*length could be wrong, or data chopped off*/
+    case 75: return "no null termination char found while decoding text chunk";
+    case 76: return "iTXt chunk too short to contain required bytes";
+    case 77: return "integer overflow in buffer size";
+    case 78: return "failed to open file for reading"; /*file doesn't exist or couldn't be opened for reading*/
+    case 79: return "failed to open file for writing";
+    case 80: return "tried creating a tree of 0 symbols";
+    case 81: return "lazy matching at pos 0 is impossible";
+    case 82: return "color conversion to palette requested while a color isn't in palette, or index out of bounds";
+    case 83: return "memory allocation failed";
+    case 84: return "given image too small to contain all pixels to be encoded";
+    case 86: return "impossible offset in lz77 encoding (internal bug)";
+    case 87: return "must provide custom zlib function pointer if LODEPNG_COMPILE_ZLIB is not defined";
+    case 88: return "invalid filter strategy given for LodePNGEncoderSettings.filter_strategy";
+    case 89: return "text chunk keyword too short or long: must have size 1-79";
+    /*the windowsize in the LodePNGCompressSettings. Requiring POT(==> & instead of %) makes encoding 12% faster.*/
+    case 90: return "windowsize must be a power of two";
+    case 91: return "invalid decompressed idat size";
+    case 92: return "integer overflow due to too many pixels";
+    case 93: return "zero width or height is invalid";
+    case 94: return "header chunk must have a size of 13 bytes";
+    case 95: return "integer overflow with combined idat chunk size";
+    case 96: return "invalid gAMA chunk size";
+    case 97: return "invalid cHRM chunk size";
+    case 98: return "invalid sRGB chunk size";
+    case 99: return "invalid sRGB rendering intent";
+    case 100: return "invalid ICC profile color type, the PNG specification only allows RGB or GRAY";
+    case 101: return "PNG specification does not allow RGB ICC profile on gray color types and vice versa";
+    case 102: return "not allowed to set grayscale ICC profile with colored pixels by PNG specification";
+    case 103: return "invalid palette index in bKGD chunk. Maybe it came before PLTE chunk?";
+    case 104: return "invalid bKGD color while encoding (e.g. palette index out of range)";
+    case 105: return "integer overflow of bitsize";
+    case 106: return "PNG file must have PLTE chunk if color type is palette";
+    case 107: return "color convert from palette mode requested without setting the palette data in it";
+    case 108: return "tried to add more than 256 values to a palette";
+    /*this limit can be configured in LodePNGDecompressSettings*/
+    case 109: return "tried to decompress zlib or deflate data larger than desired max_output_size";
+    case 110: return "custom zlib or inflate decompression failed";
+    case 111: return "custom zlib or deflate compression failed";
+    /*max text size limit can be configured in LodePNGDecoderSettings. This error prevents
+    unreasonable memory consumption when decoding due to impossibly large text sizes.*/
+    case 112: return "compressed text unreasonably large";
+    /*max ICC size limit can be configured in LodePNGDecoderSettings. This error prevents
+    unreasonable memory consumption when decoding due to impossibly large ICC profile*/
+    case 113: return "ICC profile unreasonably large";
+  }
+  return "unknown error code";
+}
+#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* // C++ Wrapper                                                          // */
+/* ////////////////////////////////////////////////////////////////////////// */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+#ifdef LODEPNG_COMPILE_CPP
+namespace lodepng {
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned load_file(std::vector<unsigned char>& buffer, const std::string& filename) {
+  long size = lodepng_filesize(filename.c_str());
+  if(size < 0) return 78;
+  buffer.resize((size_t)size);
+  return size == 0 ? 0 : lodepng_buffer_file(&buffer[0], (size_t)size, filename.c_str());
+}
+
+/*write given buffer to the file, overwriting the file, it doesn't append to it.*/
+unsigned save_file(const std::vector<unsigned char>& buffer, const std::string& filename) {
+  return lodepng_save_file(buffer.empty() ? 0 : &buffer[0], buffer.size(), filename.c_str());
+}
+#endif /* LODEPNG_COMPILE_DISK */
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_DECODER
+unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                    const LodePNGDecompressSettings& settings) {
+  unsigned char* buffer = 0;
+  size_t buffersize = 0;
+  unsigned error = zlib_decompress(&buffer, &buffersize, 0, in, insize, &settings);
+  if(buffer) {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    lodepng_free(buffer);
+  }
+  return error;
+}
+
+unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                    const LodePNGDecompressSettings& settings) {
+  return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings);
+}
+#endif /* LODEPNG_COMPILE_DECODER */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                  const LodePNGCompressSettings& settings) {
+  unsigned char* buffer = 0;
+  size_t buffersize = 0;
+  unsigned error = zlib_compress(&buffer, &buffersize, in, insize, &settings);
+  if(buffer) {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    lodepng_free(buffer);
+  }
+  return error;
+}
+
+unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                  const LodePNGCompressSettings& settings) {
+  return compress(out, in.empty() ? 0 : &in[0], in.size(), settings);
+}
+#endif /* LODEPNG_COMPILE_ENCODER */
+#endif /* LODEPNG_COMPILE_ZLIB */
+
+
+#ifdef LODEPNG_COMPILE_PNG
+
+State::State() {
+  lodepng_state_init(this);
+}
+
+State::State(const State& other) {
+  lodepng_state_init(this);
+  lodepng_state_copy(this, &other);
+}
+
+State::~State() {
+  lodepng_state_cleanup(this);
+}
+
+State& State::operator=(const State& other) {
+  lodepng_state_copy(this, &other);
+  return *this;
+}
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const unsigned char* in,
+                size_t insize, LodePNGColorType colortype, unsigned bitdepth) {
+  unsigned char* buffer = 0;
+  unsigned error = lodepng_decode_memory(&buffer, &w, &h, in, insize, colortype, bitdepth);
+  if(buffer && !error) {
+    State state;
+    state.info_raw.colortype = colortype;
+    state.info_raw.bitdepth = bitdepth;
+    size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw);
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+  }
+  lodepng_free(buffer);
+  return error;
+}
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const std::vector<unsigned char>& in, LodePNGColorType colortype, unsigned bitdepth) {
+  return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colortype, bitdepth);
+}
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const unsigned char* in, size_t insize) {
+  unsigned char* buffer = NULL;
+  unsigned error = lodepng_decode(&buffer, &w, &h, &state, in, insize);
+  if(buffer && !error) {
+    size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw);
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+  }
+  lodepng_free(buffer);
+  return error;
+}
+
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const std::vector<unsigned char>& in) {
+  return decode(out, w, h, state, in.empty() ? 0 : &in[0], in.size());
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h, const std::string& filename,
+                LodePNGColorType colortype, unsigned bitdepth) {
+  std::vector<unsigned char> buffer;
+  /* safe output values in case error happens */
+  w = h = 0;
+  unsigned error = load_file(buffer, filename);
+  if(error) return error;
+  return decode(out, w, h, buffer, colortype, bitdepth);
+}
+#endif /* LODEPNG_COMPILE_DECODER */
+#endif /* LODEPNG_COMPILE_DISK */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+unsigned encode(std::vector<unsigned char>& out, const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth) {
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error = lodepng_encode_memory(&buffer, &buffersize, in, w, h, colortype, bitdepth);
+  if(buffer) {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    lodepng_free(buffer);
+  }
+  return error;
+}
+
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth) {
+  if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84;
+  return encode(out, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth);
+}
+
+unsigned encode(std::vector<unsigned char>& out,
+                const unsigned char* in, unsigned w, unsigned h,
+                State& state) {
+  unsigned char* buffer;
+  size_t buffersize;
+  unsigned error = lodepng_encode(&buffer, &buffersize, in, w, h, &state);
+  if(buffer) {
+    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
+    lodepng_free(buffer);
+  }
+  return error;
+}
+
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                State& state) {
+  if(lodepng_get_raw_size(w, h, &state.info_raw) > in.size()) return 84;
+  return encode(out, in.empty() ? 0 : &in[0], w, h, state);
+}
+
+#ifdef LODEPNG_COMPILE_DISK
+unsigned encode(const std::string& filename,
+                const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth) {
+  std::vector<unsigned char> buffer;
+  unsigned error = encode(buffer, in, w, h, colortype, bitdepth);
+  if(!error) error = save_file(buffer, filename);
+  return error;
+}
+
+unsigned encode(const std::string& filename,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype, unsigned bitdepth) {
+  if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84;
+  return encode(filename, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth);
+}
+#endif /* LODEPNG_COMPILE_DISK */
+#endif /* LODEPNG_COMPILE_ENCODER */
+#endif /* LODEPNG_COMPILE_PNG */
+} /* namespace lodepng */
+#endif /*LODEPNG_COMPILE_CPP*/
diff --git a/gbdk/gbdk-support/png2asset/lodepng.h b/gbdk/gbdk-support/png2asset/lodepng.h
new file mode 100644
index 00000000..3e1da92d
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/lodepng.h
@@ -0,0 +1,2019 @@
+/*
+LodePNG version 20210627
+
+Copyright (c) 2005-2021 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#ifndef LODEPNG_H
+#define LODEPNG_H
+
+#include <string.h> /*for size_t*/
+
+extern const char* LODEPNG_VERSION_STRING;
+
+/*
+The following #defines are used to create code sections. They can be disabled
+to disable code sections, which can give faster compile time and smaller binary.
+The "NO_COMPILE" defines are designed to be used to pass as defines to the
+compiler command to disable them without modifying this header, e.g.
+-DLODEPNG_NO_COMPILE_ZLIB for gcc.
+In addition to those below, you can also define LODEPNG_NO_COMPILE_CRC to
+allow implementing a custom lodepng_crc32.
+*/
+/*deflate & zlib. If disabled, you must specify alternative zlib functions in
+the custom_zlib field of the compress and decompress settings*/
+#ifndef LODEPNG_NO_COMPILE_ZLIB
+#define LODEPNG_COMPILE_ZLIB
+#endif
+
+/*png encoder and png decoder*/
+#ifndef LODEPNG_NO_COMPILE_PNG
+#define LODEPNG_COMPILE_PNG
+#endif
+
+/*deflate&zlib decoder and png decoder*/
+#ifndef LODEPNG_NO_COMPILE_DECODER
+#define LODEPNG_COMPILE_DECODER
+#endif
+
+/*deflate&zlib encoder and png encoder*/
+#ifndef LODEPNG_NO_COMPILE_ENCODER
+#define LODEPNG_COMPILE_ENCODER
+#endif
+
+/*the optional built in harddisk file loading and saving functions*/
+#ifndef LODEPNG_NO_COMPILE_DISK
+#define LODEPNG_COMPILE_DISK
+#endif
+
+/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/
+#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS
+#define LODEPNG_COMPILE_ANCILLARY_CHUNKS
+#endif
+
+/*ability to convert error numerical codes to English text string*/
+#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT
+#define LODEPNG_COMPILE_ERROR_TEXT
+#endif
+
+/*Compile the default allocators (C's free, malloc and realloc). If you disable this,
+you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your
+source files with custom allocators.*/
+#ifndef LODEPNG_NO_COMPILE_ALLOCATORS
+#define LODEPNG_COMPILE_ALLOCATORS
+#endif
+
+/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/
+#ifdef __cplusplus
+#ifndef LODEPNG_NO_COMPILE_CPP
+#define LODEPNG_COMPILE_CPP
+#endif
+#endif
+
+#ifdef LODEPNG_COMPILE_CPP
+#include <vector>
+#include <string>
+#endif /*LODEPNG_COMPILE_CPP*/
+
+#ifdef LODEPNG_COMPILE_PNG
+/*The PNG color types (also used for raw image).*/
+typedef enum LodePNGColorType {
+  LCT_GREY = 0, /*grayscale: 1,2,4,8,16 bit*/
+  LCT_RGB = 2, /*RGB: 8,16 bit*/
+  LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/
+  LCT_GREY_ALPHA = 4, /*grayscale with alpha: 8,16 bit*/
+  LCT_RGBA = 6, /*RGB with alpha: 8,16 bit*/
+  /*LCT_MAX_OCTET_VALUE lets the compiler allow this enum to represent any invalid
+  byte value from 0 to 255 that could be present in an invalid PNG file header. Do
+  not use, compare with or set the name LCT_MAX_OCTET_VALUE, instead either use
+  the valid color type names above, or numeric values like 1 or 7 when checking for
+  particular disallowed color type byte values, or cast to integer to print it.*/
+  LCT_MAX_OCTET_VALUE = 255
+} LodePNGColorType;
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Converts PNG data in memory to raw pixel data.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     After decoding, its size is w * h * (bytes per pixel) bytes larger than
+     initially. Bytes per pixel depends on colortype and bitdepth.
+     Must be freed after usage with free(*out).
+     Note: for 16-bit per channel colors, uses big endian format like PNG does.
+w: Output parameter. Pointer to width of pixel data.
+h: Output parameter. Pointer to height of pixel data.
+in: Memory buffer with the PNG file.
+insize: size of the in buffer.
+colortype: the desired color type for the raw output image. See explanation on PNG color types.
+bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h,
+                               const unsigned char* in, size_t insize,
+                               LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/
+unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h,
+                          const unsigned char* in, size_t insize);
+
+/*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/
+unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h,
+                          const unsigned char* in, size_t insize);
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load PNG from disk, from file with given name.
+Same as the other decode functions, but instead takes a filename as input.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory.*/
+unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h,
+                             const char* filename,
+                             LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory.*/
+unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h,
+                               const char* filename);
+
+/*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory.*/
+unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h,
+                               const char* filename);
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Converts raw pixel data into a PNG image in memory. The colortype and bitdepth
+  of the output PNG image cannot be chosen, they are automatically determined
+  by the colortype, bitdepth and content of the input pixel data.
+  Note: for 16-bit per channel colors, needs big endian format like PNG does.
+out: Output parameter. Pointer to buffer that will contain the PNG image data.
+     Must be freed after usage with free(*out).
+outsize: Output parameter. Pointer to the size in bytes of the out buffer.
+image: The raw pixel data to encode. The size of this buffer should be
+       w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth.
+w: width of the raw pixel data in pixels.
+h: height of the raw pixel data in pixels.
+colortype: the color type of the raw input image. See explanation on PNG color types.
+bitdepth: the bit depth of the raw input image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize,
+                               const unsigned char* image, unsigned w, unsigned h,
+                               LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/
+unsigned lodepng_encode32(unsigned char** out, size_t* outsize,
+                          const unsigned char* image, unsigned w, unsigned h);
+
+/*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/
+unsigned lodepng_encode24(unsigned char** out, size_t* outsize,
+                          const unsigned char* image, unsigned w, unsigned h);
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+
+NOTE: This overwrites existing files without warning!
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and encode in-memory.*/
+unsigned lodepng_encode_file(const char* filename,
+                             const unsigned char* image, unsigned w, unsigned h,
+                             LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and encode in-memory.*/
+unsigned lodepng_encode32_file(const char* filename,
+                               const unsigned char* image, unsigned w, unsigned h);
+
+/*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and encode in-memory.*/
+unsigned lodepng_encode24_file(const char* filename,
+                               const unsigned char* image, unsigned w, unsigned h);
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#ifdef LODEPNG_COMPILE_CPP
+namespace lodepng {
+#ifdef LODEPNG_COMPILE_DECODER
+/*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype
+is the format to output the pixels to. Default is RGBA 8-bit per channel.*/
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const unsigned char* in, size_t insize,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const std::vector<unsigned char>& in,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts PNG file from disk to raw pixel data in memory.
+Same as the other decode functions, but instead takes a filename as input.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory.
+*/
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                const std::string& filename,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#endif /* LODEPNG_COMPILE_DISK */
+#endif /* LODEPNG_COMPILE_DECODER */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*Same as lodepng_encode_memory, but encodes to an std::vector. colortype
+is that of the raw input data. The output PNG color type will be auto chosen.*/
+unsigned encode(std::vector<unsigned char>& out,
+                const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts 32-bit RGBA raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+
+NOTE: This overwrites existing files without warning!
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory.
+*/
+unsigned encode(const std::string& filename,
+                const unsigned char* in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned encode(const std::string& filename,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#endif /* LODEPNG_COMPILE_DISK */
+#endif /* LODEPNG_COMPILE_ENCODER */
+} /* namespace lodepng */
+#endif /*LODEPNG_COMPILE_CPP*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ERROR_TEXT
+/*Returns an English description of the numerical error code.*/
+const char* lodepng_error_text(unsigned code);
+#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Settings for zlib decompression*/
+typedef struct LodePNGDecompressSettings LodePNGDecompressSettings;
+struct LodePNGDecompressSettings {
+  /* Check LodePNGDecoderSettings for more ignorable errors such as ignore_crc */
+  unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/
+  unsigned ignore_nlen; /*ignore complement of len checksum in uncompressed blocks*/
+
+  /*Maximum decompressed size, beyond this the decoder may (and is encouraged to) stop decoding,
+  return an error, output a data size > max_output_size and all the data up to that point. This is
+  not hard limit nor a guarantee, but can prevent excessive memory usage. This setting is
+  ignored by the PNG decoder, but is used by the deflate/zlib decoder and can be used by custom ones.
+  Set to 0 to impose no limit (the default).*/
+  size_t max_output_size;
+
+  /*use custom zlib decoder instead of built in one (default: null).
+  Should return 0 if success, any non-0 if error (numeric value not exposed).*/
+  unsigned (*custom_zlib)(unsigned char**, size_t*,
+                          const unsigned char*, size_t,
+                          const LodePNGDecompressSettings*);
+  /*use custom deflate decoder instead of built in one (default: null)
+  if custom_zlib is not null, custom_inflate is ignored (the zlib format uses deflate).
+  Should return 0 if success, any non-0 if error (numeric value not exposed).*/
+  unsigned (*custom_inflate)(unsigned char**, size_t*,
+                             const unsigned char*, size_t,
+                             const LodePNGDecompressSettings*);
+
+  const void* custom_context; /*optional custom settings for custom functions*/
+};
+
+extern const LodePNGDecompressSettings lodepng_default_decompress_settings;
+void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Settings for zlib compression. Tweaking these settings tweaks the balance
+between speed and compression ratio.
+*/
+typedef struct LodePNGCompressSettings LodePNGCompressSettings;
+struct LodePNGCompressSettings /*deflate = compress*/ {
+  /*LZ77 related settings*/
+  unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/
+  unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
+  unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/
+  unsigned minmatch; /*minimum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/
+  unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/
+  unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/
+
+  /*use custom zlib encoder instead of built in one (default: null)*/
+  unsigned (*custom_zlib)(unsigned char**, size_t*,
+                          const unsigned char*, size_t,
+                          const LodePNGCompressSettings*);
+  /*use custom deflate encoder instead of built in one (default: null)
+  if custom_zlib is used, custom_deflate is ignored since only the built in
+  zlib function will call custom_deflate*/
+  unsigned (*custom_deflate)(unsigned char**, size_t*,
+                             const unsigned char*, size_t,
+                             const LodePNGCompressSettings*);
+
+  const void* custom_context; /*optional custom settings for custom functions*/
+};
+
+extern const LodePNGCompressSettings lodepng_default_compress_settings;
+void lodepng_compress_settings_init(LodePNGCompressSettings* settings);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_PNG
+/*
+Color mode of an image. Contains all information required to decode the pixel
+bits to RGBA colors. This information is the same as used in the PNG file
+format, and is used both for PNG and raw image data in LodePNG.
+*/
+typedef struct LodePNGColorMode {
+  /*header (IHDR)*/
+  LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/
+  unsigned bitdepth;  /*bits per sample, see PNG standard or documentation further in this header file*/
+
+  /*
+  palette (PLTE and tRNS)
+
+  Dynamically allocated with the colors of the palette, including alpha.
+  This field may not be allocated directly, use lodepng_color_mode_init first,
+  then lodepng_palette_add per color to correctly initialize it (to ensure size
+  of exactly 1024 bytes).
+
+  The alpha channels must be set as well, set them to 255 for opaque images.
+
+  When decoding, by default you can ignore this palette, since LodePNG already
+  fills the palette colors in the pixels of the raw RGBA output.
+
+  The palette is only supported for color type 3.
+  */
+  unsigned char* palette; /*palette in RGBARGBA... order. Must be either 0, or when allocated must have 1024 bytes*/
+  size_t palettesize; /*palette size in number of colors (amount of used bytes is 4 * palettesize)*/
+
+  /*
+  transparent color key (tRNS)
+
+  This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit.
+  For grayscale PNGs, r, g and b will all 3 be set to the same.
+
+  When decoding, by default you can ignore this information, since LodePNG sets
+  pixels with this key to transparent already in the raw RGBA output.
+
+  The color key is only supported for color types 0 and 2.
+  */
+  unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/
+  unsigned key_r;       /*red/grayscale component of color key*/
+  unsigned key_g;       /*green component of color key*/
+  unsigned key_b;       /*blue component of color key*/
+} LodePNGColorMode;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_color_mode_init(LodePNGColorMode* info);
+void lodepng_color_mode_cleanup(LodePNGColorMode* info);
+/*return value is error code (0 means no error)*/
+unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source);
+/* Makes a temporary LodePNGColorMode that does not need cleanup (no palette) */
+LodePNGColorMode lodepng_color_mode_make(LodePNGColorType colortype, unsigned bitdepth);
+
+void lodepng_palette_clear(LodePNGColorMode* info);
+/*add 1 color to the palette*/
+unsigned lodepng_palette_add(LodePNGColorMode* info,
+                             unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+
+/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/
+unsigned lodepng_get_bpp(const LodePNGColorMode* info);
+/*get the amount of color channels used, based on colortype in the struct.
+If a palette is used, it counts as 1 channel.*/
+unsigned lodepng_get_channels(const LodePNGColorMode* info);
+/*is it a grayscale type? (only colortype 0 or 4)*/
+unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info);
+/*has it got an alpha channel? (only colortype 2 or 6)*/
+unsigned lodepng_is_alpha_type(const LodePNGColorMode* info);
+/*has it got a palette? (only colortype 3)*/
+unsigned lodepng_is_palette_type(const LodePNGColorMode* info);
+/*only returns true if there is a palette and there is a value in the palette with alpha < 255.
+Loops through the palette to check this.*/
+unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info);
+/*
+Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image.
+Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels).
+Returns false if the image can only have opaque pixels.
+In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values,
+or if "key_defined" is true.
+*/
+unsigned lodepng_can_have_alpha(const LodePNGColorMode* info);
+/*Returns the byte size of a raw image buffer with given width, height and color mode*/
+size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*The information of a Time chunk in PNG.*/
+typedef struct LodePNGTime {
+  unsigned year;    /*2 bytes used (0-65535)*/
+  unsigned month;   /*1-12*/
+  unsigned day;     /*1-31*/
+  unsigned hour;    /*0-23*/
+  unsigned minute;  /*0-59*/
+  unsigned second;  /*0-60 (to allow for leap seconds)*/
+} LodePNGTime;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*Information about the PNG image, except pixels, width and height.*/
+typedef struct LodePNGInfo {
+  /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/
+  unsigned compression_method;/*compression method of the original file. Always 0.*/
+  unsigned filter_method;     /*filter method of the original file*/
+  unsigned interlace_method;  /*interlace method of the original file: 0=none, 1=Adam7*/
+  LodePNGColorMode color;     /*color type and bits, palette and transparency of the PNG file*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*
+  Suggested background color chunk (bKGD)
+
+  This uses the same color mode and bit depth as the PNG (except no alpha channel),
+  with values truncated to the bit depth in the unsigned integer.
+
+  For grayscale and palette PNGs, the value is stored in background_r. The values
+  in background_g and background_b are then unused.
+
+  So when decoding, you may get these in a different color mode than the one you requested
+  for the raw pixels.
+
+  When encoding with auto_convert, you must use the color model defined in info_png.color for
+  these values. The encoder normally ignores info_png.color when auto_convert is on, but will
+  use it to interpret these values (and convert copies of them to its chosen color model).
+
+  When encoding, avoid setting this to an expensive color, such as a non-gray value
+  when the image is gray, or the compression will be worse since it will be forced to
+  write the PNG with a more expensive color mode (when auto_convert is on).
+
+  The decoder does not use this background color to edit the color of pixels. This is a
+  completely optional metadata feature.
+  */
+  unsigned background_defined; /*is a suggested background color given?*/
+  unsigned background_r;       /*red/gray/palette component of suggested background color*/
+  unsigned background_g;       /*green component of suggested background color*/
+  unsigned background_b;       /*blue component of suggested background color*/
+
+  /*
+  Non-international text chunks (tEXt and zTXt)
+
+  The char** arrays each contain num strings. The actual messages are in
+  text_strings, while text_keys are keywords that give a short description what
+  the actual text represents, e.g. Title, Author, Description, or anything else.
+
+  All the string fields below including strings, keys, names and language tags are null terminated.
+  The PNG specification uses null characters for the keys, names and tags, and forbids null
+  characters to appear in the main text which is why we can use null termination everywhere here.
+
+  A keyword is minimum 1 character and maximum 79 characters long (plus the
+  additional null terminator). It's discouraged to use a single line length
+  longer than 79 characters for texts.
+
+  Don't allocate these text buffers yourself. Use the init/cleanup functions
+  correctly and use lodepng_add_text and lodepng_clear_text.
+
+  Standard text chunk keywords and strings are encoded using Latin-1.
+  */
+  size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/
+  char** text_keys; /*the keyword of a text chunk (e.g. "Comment")*/
+  char** text_strings; /*the actual text*/
+
+  /*
+  International text chunks (iTXt)
+  Similar to the non-international text chunks, but with additional strings
+  "langtags" and "transkeys", and the following text encodings are used:
+  keys: Latin-1, langtags: ASCII, transkeys and strings: UTF-8.
+  keys must be 1-79 characters (plus the additional null terminator), the other
+  strings are any length.
+  */
+  size_t itext_num; /*the amount of international texts in this PNG*/
+  char** itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/
+  char** itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/
+  char** itext_transkeys; /*keyword translated to the international language - UTF-8 string*/
+  char** itext_strings; /*the actual international text - UTF-8 string*/
+
+  /*time chunk (tIME)*/
+  unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/
+  LodePNGTime time;
+
+  /*phys chunk (pHYs)*/
+  unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/
+  unsigned phys_x; /*pixels per unit in x direction*/
+  unsigned phys_y; /*pixels per unit in y direction*/
+  unsigned phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/
+
+  /*
+  Color profile related chunks: gAMA, cHRM, sRGB, iCPP
+
+  LodePNG does not apply any color conversions on pixels in the encoder or decoder and does not interpret these color
+  profile values. It merely passes on the information. If you wish to use color profiles and convert colors, please
+  use these values with a color management library.
+
+  See the PNG, ICC and sRGB specifications for more information about the meaning of these values.
+  */
+
+  /* gAMA chunk: optional, overridden by sRGB or iCCP if those are present. */
+  unsigned gama_defined; /* Whether a gAMA chunk is present (0 = not present, 1 = present). */
+  unsigned gama_gamma;   /* Gamma exponent times 100000 */
+
+  /* cHRM chunk: optional, overridden by sRGB or iCCP if those are present. */
+  unsigned chrm_defined; /* Whether a cHRM chunk is present (0 = not present, 1 = present). */
+  unsigned chrm_white_x; /* White Point x times 100000 */
+  unsigned chrm_white_y; /* White Point y times 100000 */
+  unsigned chrm_red_x;   /* Red x times 100000 */
+  unsigned chrm_red_y;   /* Red y times 100000 */
+  unsigned chrm_green_x; /* Green x times 100000 */
+  unsigned chrm_green_y; /* Green y times 100000 */
+  unsigned chrm_blue_x;  /* Blue x times 100000 */
+  unsigned chrm_blue_y;  /* Blue y times 100000 */
+
+  /*
+  sRGB chunk: optional. May not appear at the same time as iCCP.
+  If gAMA is also present gAMA must contain value 45455.
+  If cHRM is also present cHRM must contain respectively 31270,32900,64000,33000,30000,60000,15000,6000.
+  */
+  unsigned srgb_defined; /* Whether an sRGB chunk is present (0 = not present, 1 = present). */
+  unsigned srgb_intent;  /* Rendering intent: 0=perceptual, 1=rel. colorimetric, 2=saturation, 3=abs. colorimetric */
+
+  /*
+  iCCP chunk: optional. May not appear at the same time as sRGB.
+
+  LodePNG does not parse or use the ICC profile (except its color space header field for an edge case), a
+  separate library to handle the ICC data (not included in LodePNG) format is needed to use it for color
+  management and conversions.
+
+  For encoding, if iCCP is present, gAMA and cHRM are recommended to be added as well with values that match the ICC
+  profile as closely as possible, if you wish to do this you should provide the correct values for gAMA and cHRM and
+  enable their '_defined' flags since LodePNG will not automatically compute them from the ICC profile.
+
+  For encoding, the ICC profile is required by the PNG specification to be an "RGB" profile for non-gray
+  PNG color types and a "GRAY" profile for gray PNG color types. If you disable auto_convert, you must ensure
+  the ICC profile type matches your requested color type, else the encoder gives an error. If auto_convert is
+  enabled (the default), and the ICC profile is not a good match for the pixel data, this will result in an encoder
+  error if the pixel data has non-gray pixels for a GRAY profile, or a silent less-optimal compression of the pixel
+  data if the pixels could be encoded as grayscale but the ICC profile is RGB.
+
+  To avoid this do not set an ICC profile in the image unless there is a good reason for it, and when doing so
+  make sure you compute it carefully to avoid the above problems.
+  */
+  unsigned iccp_defined;      /* Whether an iCCP chunk is present (0 = not present, 1 = present). */
+  char* iccp_name;            /* Null terminated string with profile name, 1-79 bytes */
+  /*
+  The ICC profile in iccp_profile_size bytes.
+  Don't allocate this buffer yourself. Use the init/cleanup functions
+  correctly and use lodepng_set_icc and lodepng_clear_icc.
+  */
+  unsigned char* iccp_profile;
+  unsigned iccp_profile_size; /* The size of iccp_profile in bytes */
+
+  /* End of color profile related chunks */
+
+
+  /*
+  unknown chunks: chunks not known by LodePNG, passed on byte for byte.
+
+  There are 3 buffers, one for each position in the PNG where unknown chunks can appear.
+  Each buffer contains all unknown chunks for that position consecutively.
+  The 3 positions are:
+  0: between IHDR and PLTE, 1: between PLTE and IDAT, 2: between IDAT and IEND.
+
+  For encoding, do not store critical chunks or known chunks that are enabled with a "_defined" flag
+  above in here, since the encoder will blindly follow this and could then encode an invalid PNG file
+  (such as one with two IHDR chunks or the disallowed combination of sRGB with iCCP). But do use
+  this if you wish to store an ancillary chunk that is not supported by LodePNG (such as sPLT or hIST),
+  or any non-standard PNG chunk.
+
+  Do not allocate or traverse this data yourself. Use the chunk traversing functions declared
+  later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct.
+  */
+  unsigned char* unknown_chunks_data[3];
+  size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGInfo;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_info_init(LodePNGInfo* info);
+void lodepng_info_cleanup(LodePNGInfo* info);
+/*return value is error code (0 means no error)*/
+unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /*push back both texts at once*/
+void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/
+
+unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag,
+                           const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/
+void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled them in*/
+
+/*replaces if exists*/
+unsigned lodepng_set_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size);
+void lodepng_clear_icc(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*
+Converts raw buffer from one color type to another color type, based on
+LodePNGColorMode structs to describe the input and output color type.
+See the reference manual at the end of this header file to see which color conversions are supported.
+return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported)
+The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
+of the output color type (lodepng_get_bpp).
+For < 8 bpp images, there should not be padding bits at the end of scanlines.
+For 16-bit per channel colors, uses big endian format like PNG does.
+Return value is LodePNG error code
+*/
+unsigned lodepng_convert(unsigned char* out, const unsigned char* in,
+                         const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in,
+                         unsigned w, unsigned h);
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Settings for the decoder. This contains settings for the PNG and the Zlib
+decoder, but not the Info settings from the Info structs.
+*/
+typedef struct LodePNGDecoderSettings {
+  LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
+
+  /* Check LodePNGDecompressSettings for more ignorable errors such as ignore_adler32 */
+  unsigned ignore_crc; /*ignore CRC checksums*/
+  unsigned ignore_critical; /*ignore unknown critical chunks*/
+  unsigned ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/
+  /* TODO: make a system involving warnings with levels and a strict mode instead. Other potentially recoverable
+     errors: srgb rendering intent value, size of content of ancillary chunks, more than 79 characters for some
+     strings, placement/combination rules for ancillary chunks, crc of unknown chunks, allowed characters
+     in string keys, etc... */
+
+  unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/
+
+  /*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/
+  unsigned remember_unknown_chunks;
+
+  /* maximum size for decompressed text chunks. If a text chunk's text is larger than this, an error is returned,
+  unless reading text chunks is disabled or this limit is set higher or disabled. Set to 0 to allow any size.
+  By default it is a value that prevents unreasonably large strings from hogging memory. */
+  size_t max_text_size;
+
+  /* maximum size for compressed ICC chunks. If the ICC profile is larger than this, an error will be returned. Set to
+  0 to allow any size. By default this is a value that prevents ICC profiles that would be much larger than any
+  legitimate profile could be to hog memory. */
+  size_t max_icc_size;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGDecoderSettings;
+
+void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/
+typedef enum LodePNGFilterStrategy {
+  /*every filter at zero*/
+  LFS_ZERO = 0,
+  /*every filter at 1, 2, 3 or 4 (paeth), unlike LFS_ZERO not a good choice, but for testing*/
+  LFS_ONE = 1,
+  LFS_TWO = 2,
+  LFS_THREE = 3,
+  LFS_FOUR = 4,
+  /*Use filter that gives minimum sum, as described in the official PNG filter heuristic.*/
+  LFS_MINSUM,
+  /*Use the filter type that gives smallest Shannon entropy for this scanline. Depending
+  on the image, this is better or worse than minsum.*/
+  LFS_ENTROPY,
+  /*
+  Brute-force-search PNG filters by compressing each filter for each scanline.
+  Experimental, very slow, and only rarely gives better compression than MINSUM.
+  */
+  LFS_BRUTE_FORCE,
+  /*use predefined_filters buffer: you specify the filter type for each scanline*/
+  LFS_PREDEFINED
+} LodePNGFilterStrategy;
+
+/*Gives characteristics about the integer RGBA colors of the image (count, alpha channel usage, bit depth, ...),
+which helps decide which color model to use for encoding.
+Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/
+typedef struct LodePNGColorStats {
+  unsigned colored; /*not grayscale*/
+  unsigned key; /*image is not opaque and color key is possible instead of full alpha*/
+  unsigned short key_r; /*key values, always as 16-bit, in 8-bit case the byte is duplicated, e.g. 65535 means 255*/
+  unsigned short key_g;
+  unsigned short key_b;
+  unsigned alpha; /*image is not opaque and alpha channel or alpha palette required*/
+  unsigned numcolors; /*amount of colors, up to 257. Not valid if bits == 16 or allow_palette is disabled.*/
+  unsigned char palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order, only valid when numcolors is valid*/
+  unsigned bits; /*bits per channel (not for palette). 1,2 or 4 for grayscale only. 16 if 16-bit per channel required.*/
+  size_t numpixels;
+
+  /*user settings for computing/using the stats*/
+  unsigned allow_palette; /*default 1. if 0, disallow choosing palette colortype in auto_choose_color, and don't count numcolors*/
+  unsigned allow_greyscale; /*default 1. if 0, choose RGB or RGBA even if the image only has gray colors*/
+} LodePNGColorStats;
+
+void lodepng_color_stats_init(LodePNGColorStats* stats);
+
+/*Get a LodePNGColorStats of the image. The stats must already have been inited.
+Returns error code (e.g. alloc fail) or 0 if ok.*/
+unsigned lodepng_compute_color_stats(LodePNGColorStats* stats,
+                                     const unsigned char* image, unsigned w, unsigned h,
+                                     const LodePNGColorMode* mode_in);
+
+/*Settings for the encoder.*/
+typedef struct LodePNGEncoderSettings {
+  LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
+
+  unsigned auto_convert; /*automatically choose output PNG color type. Default: true*/
+
+  /*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than
+  8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to
+  completely follow the official PNG heuristic, filter_palette_zero must be true and
+  filter_strategy must be LFS_MINSUM*/
+  unsigned filter_palette_zero;
+  /*Which filter strategy to use when not using zeroes due to filter_palette_zero.
+  Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/
+  LodePNGFilterStrategy filter_strategy;
+  /*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with
+  the same length as the amount of scanlines in the image, and each value must <= 5. You
+  have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero
+  must be set to 0 to ensure this is also used on palette or low bitdepth images.*/
+  const unsigned char* predefined_filters;
+
+  /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette).
+  If colortype is 3, PLTE is _always_ created.*/
+  unsigned force_palette;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*add LodePNG identifier and version as a text chunk, for debugging*/
+  unsigned add_id;
+  /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/
+  unsigned text_compression;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGEncoderSettings;
+
+void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER)
+/*The settings, state and information for extended encoding and decoding.*/
+typedef struct LodePNGState {
+#ifdef LODEPNG_COMPILE_DECODER
+  LodePNGDecoderSettings decoder; /*the decoding settings*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+  LodePNGEncoderSettings encoder; /*the encoding settings*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+  LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/
+  LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/
+  unsigned error;
+} LodePNGState;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_state_init(LodePNGState* state);
+void lodepng_state_cleanup(LodePNGState* state);
+void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source);
+#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and
+getting much more information about the PNG image and color mode.
+*/
+unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h,
+                        LodePNGState* state,
+                        const unsigned char* in, size_t insize);
+
+/*
+Read the PNG header, but not the actual data. This returns only the information
+that is in the IHDR chunk of the PNG, such as width, height and color type. The
+information is placed in the info_png field of the LodePNGState.
+*/
+unsigned lodepng_inspect(unsigned* w, unsigned* h,
+                         LodePNGState* state,
+                         const unsigned char* in, size_t insize);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+/*
+Reads one metadata chunk (other than IHDR) of the PNG file and outputs what it
+read in the state. Returns error code on failure.
+Use lodepng_inspect first with a new state, then e.g. lodepng_chunk_find_const
+to find the desired chunk type, and if non null use lodepng_inspect_chunk (with
+chunk_pointer - start_of_file as pos).
+Supports most metadata chunks from the PNG standard (gAMA, bKGD, tEXt, ...).
+Ignores unsupported, unknown, non-metadata or IHDR chunks (without error).
+Requirements: &in[pos] must point to start of a chunk, must use regular
+lodepng_inspect first since format of most other chunks depends on IHDR, and if
+there is a PLTE chunk, that one must be inspected before tRNS or bKGD.
+*/
+unsigned lodepng_inspect_chunk(LodePNGState* state, size_t pos,
+                               const unsigned char* in, size_t insize);
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/
+unsigned lodepng_encode(unsigned char** out, size_t* outsize,
+                        const unsigned char* image, unsigned w, unsigned h,
+                        LodePNGState* state);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*
+The lodepng_chunk functions are normally not needed, except to traverse the
+unknown chunks stored in the LodePNGInfo struct, or add new ones to it.
+It also allows traversing the chunks of an encoded PNG file yourself.
+
+The chunk pointer always points to the beginning of the chunk itself, that is
+the first byte of the 4 length bytes.
+
+In the PNG file format, chunks have the following format:
+-4 bytes length: length of the data of the chunk in bytes (chunk itself is 12 bytes longer)
+-4 bytes chunk type (ASCII a-z,A-Z only, see below)
+-length bytes of data (may be 0 bytes if length was 0)
+-4 bytes of CRC, computed on chunk name + data
+
+The first chunk starts at the 8th byte of the PNG file, the entire rest of the file
+exists out of concatenated chunks with the above format.
+
+PNG standard chunk ASCII naming conventions:
+-First byte: uppercase = critical, lowercase = ancillary
+-Second byte: uppercase = public, lowercase = private
+-Third byte: must be uppercase
+-Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy
+*/
+
+/*
+Gets the length of the data of the chunk. Total chunk length has 12 bytes more.
+There must be at least 4 bytes to read from. If the result value is too large,
+it may be corrupt data.
+*/
+unsigned lodepng_chunk_length(const unsigned char* chunk);
+
+/*puts the 4-byte type in null terminated string*/
+void lodepng_chunk_type(char type[5], const unsigned char* chunk);
+
+/*check if the type is the given type*/
+unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type);
+
+/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/
+unsigned char lodepng_chunk_ancillary(const unsigned char* chunk);
+
+/*0: public, 1: private (see PNG standard)*/
+unsigned char lodepng_chunk_private(const unsigned char* chunk);
+
+/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/
+unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk);
+
+/*get pointer to the data of the chunk, where the input points to the header of the chunk*/
+unsigned char* lodepng_chunk_data(unsigned char* chunk);
+const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk);
+
+/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/
+unsigned lodepng_chunk_check_crc(const unsigned char* chunk);
+
+/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/
+void lodepng_chunk_generate_crc(unsigned char* chunk);
+
+/*
+Iterate to next chunks, allows iterating through all chunks of the PNG file.
+Input must be at the beginning of a chunk (result of a previous lodepng_chunk_next call,
+or the 8th byte of a PNG file which always has the first chunk), or alternatively may
+point to the first byte of the PNG file (which is not a chunk but the magic header, the
+function will then skip over it and return the first real chunk).
+Will output pointer to the start of the next chunk, or at or beyond end of the file if there
+is no more chunk after this or possibly if the chunk is corrupt.
+Start this process at the 8th byte of the PNG file.
+In a non-corrupt PNG file, the last chunk should have name "IEND".
+*/
+unsigned char* lodepng_chunk_next(unsigned char* chunk, unsigned char* end);
+const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk, const unsigned char* end);
+
+/*Finds the first chunk with the given type in the range [chunk, end), or returns NULL if not found.*/
+unsigned char* lodepng_chunk_find(unsigned char* chunk, unsigned char* end, const char type[5]);
+const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]);
+
+/*
+Appends chunk to the data in out. The given chunk should already have its chunk header.
+The out variable and outsize are updated to reflect the new reallocated buffer.
+Returns error code (0 if it went ok)
+*/
+unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk);
+
+/*
+Appends new chunk to out. The chunk to append is given by giving its length, type
+and data separately. The type is a 4-letter string.
+The out variable and outsize are updated to reflect the new reallocated buffer.
+Returne error code (0 if it went ok)
+*/
+unsigned lodepng_chunk_create(unsigned char** out, size_t* outsize, unsigned length,
+                              const char* type, const unsigned char* data);
+
+
+/*Calculate CRC32 of buffer*/
+unsigned lodepng_crc32(const unsigned char* buf, size_t len);
+#endif /*LODEPNG_COMPILE_PNG*/
+
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/*
+This zlib part can be used independently to zlib compress and decompress a
+buffer. It cannot be used to create gzip files however, and it only supports the
+part of zlib that is required for PNG, it does not support dictionaries.
+*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/
+unsigned lodepng_inflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGDecompressSettings* settings);
+
+/*
+Decompresses Zlib data. Reallocates the out buffer and appends the data. The
+data must be according to the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.
+*/
+unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize,
+                                 const unsigned char* in, size_t insize,
+                                 const LodePNGDecompressSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Compresses data with Zlib. Reallocates the out buffer and appends the data.
+Zlib adds a small header and trailer around the deflate data.
+The data is output in the format of the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.
+*/
+unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize,
+                               const unsigned char* in, size_t insize,
+                               const LodePNGCompressSettings* settings);
+
+/*
+Find length-limited Huffman code for given frequencies. This function is in the
+public interface only for tests, it's used internally by lodepng_deflate.
+*/
+unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies,
+                                      size_t numcodes, unsigned maxbitlen);
+
+/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/
+unsigned lodepng_deflate(unsigned char** out, size_t* outsize,
+                         const unsigned char* in, size_t insize,
+                         const LodePNGCompressSettings* settings);
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load a file from disk into buffer. The function allocates the out buffer, and
+after usage you should free it.
+out: output parameter, contains pointer to loaded buffer.
+outsize: output parameter, size of the allocated out buffer
+filename: the path to the file to load
+return value: error code (0 means ok)
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory.
+*/
+unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename);
+
+/*
+Save a file from buffer to disk. Warning, if it exists, this function overwrites
+the file without warning!
+buffer: the buffer to write
+buffersize: size of the buffer to write
+filename: the path to the file to save to
+return value: error code (0 means ok)
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and encode in-memory
+*/
+unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename);
+#endif /*LODEPNG_COMPILE_DISK*/
+
+#ifdef LODEPNG_COMPILE_CPP
+/* The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. */
+namespace lodepng {
+#ifdef LODEPNG_COMPILE_PNG
+class State : public LodePNGState {
+  public:
+    State();
+    State(const State& other);
+    ~State();
+    State& operator=(const State& other);
+};
+
+#ifdef LODEPNG_COMPILE_DECODER
+/* Same as other lodepng::decode, but using a State for more settings and information. */
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const unsigned char* in, size_t insize);
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                State& state,
+                const std::vector<unsigned char>& in);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/* Same as other lodepng::encode, but using a State for more settings and information. */
+unsigned encode(std::vector<unsigned char>& out,
+                const unsigned char* in, unsigned w, unsigned h,
+                State& state);
+unsigned encode(std::vector<unsigned char>& out,
+                const std::vector<unsigned char>& in, unsigned w, unsigned h,
+                State& state);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load a file from disk into an std::vector.
+return value: error code (0 means ok)
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and decode in-memory
+*/
+unsigned load_file(std::vector<unsigned char>& buffer, const std::string& filename);
+
+/*
+Save the binary data in an std::vector to a file on disk. The file is overwritten
+without warning.
+
+NOTE: Wide-character filenames are not supported, you can use an external method
+to handle such files and encode in-memory
+*/
+unsigned save_file(const std::vector<unsigned char>& buffer, const std::string& filename);
+#endif /* LODEPNG_COMPILE_DISK */
+#endif /* LODEPNG_COMPILE_PNG */
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#ifdef LODEPNG_COMPILE_DECODER
+/* Zlib-decompress an unsigned char buffer */
+unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                    const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
+
+/* Zlib-decompress an std::vector */
+unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                    const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
+#endif /* LODEPNG_COMPILE_DECODER */
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/* Zlib-compress an unsigned char buffer */
+unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                  const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
+
+/* Zlib-compress an std::vector */
+unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                  const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
+#endif /* LODEPNG_COMPILE_ENCODER */
+#endif /* LODEPNG_COMPILE_ZLIB */
+} /* namespace lodepng */
+#endif /*LODEPNG_COMPILE_CPP*/
+
+/*
+TODO:
+[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often
+[.] check compatibility with various compilers  - done but needs to be redone for every newer version
+[X] converting color to 16-bit per channel types
+[X] support color profile chunk types (but never let them touch RGB values by default)
+[ ] support all public PNG chunk types (almost done except sBIT, sPLT and hIST)
+[ ] make sure encoder generates no chunks with size > (2^31)-1
+[ ] partial decoding (stream processing)
+[X] let the "isFullyOpaque" function check color keys and transparent palettes too
+[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
+[ ] allow treating some errors like warnings, when image is recoverable (e.g. 69, 57, 58)
+[ ] make warnings like: oob palette, checksum fail, data after iend, wrong/unknown crit chunk, no null terminator in text, ...
+[ ] error messages with line numbers (and version)
+[ ] errors in state instead of as return code?
+[ ] new errors/warnings like suspiciously big decompressed ztxt or iccp chunk
+[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes
+[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ...
+[ ] allow user to give data (void*) to custom allocator
+[X] provide alternatives for C library functions not present on some platforms (memcpy, ...)
+*/
+
+#endif /*LODEPNG_H inclusion guard*/
+
+/*
+LodePNG Documentation
+---------------------
+
+0. table of contents
+--------------------
+
+  1. about
+   1.1. supported features
+   1.2. features not supported
+  2. C and C++ version
+  3. security
+  4. decoding
+  5. encoding
+  6. color conversions
+    6.1. PNG color types
+    6.2. color conversions
+    6.3. padding bits
+    6.4. A note about 16-bits per channel and endianness
+  7. error values
+  8. chunks and PNG editing
+  9. compiler support
+  10. examples
+   10.1. decoder C++ example
+   10.2. decoder C example
+  11. state settings reference
+  12. changes
+  13. contact information
+
+
+1. about
+--------
+
+PNG is a file format to store raster images losslessly with good compression,
+supporting different color types and alpha channel.
+
+LodePNG is a PNG codec according to the Portable Network Graphics (PNG)
+Specification (Second Edition) - W3C Recommendation 10 November 2003.
+
+The specifications used are:
+
+*) Portable Network Graphics (PNG) Specification (Second Edition):
+     http://www.w3.org/TR/2003/REC-PNG-20031110
+*) RFC 1950 ZLIB Compressed Data Format version 3.3:
+     http://www.gzip.org/zlib/rfc-zlib.html
+*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3:
+     http://www.gzip.org/zlib/rfc-deflate.html
+
+The most recent version of LodePNG can currently be found at
+http://lodev.org/lodepng/
+
+LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds
+extra functionality.
+
+LodePNG exists out of two files:
+-lodepng.h: the header file for both C and C++
+-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage
+
+If you want to start using LodePNG right away without reading this doc, get the
+examples from the LodePNG website to see how to use it in code, or check the
+smaller examples in chapter 13 here.
+
+LodePNG is simple but only supports the basic requirements. To achieve
+simplicity, the following design choices were made: There are no dependencies
+on any external library. There are functions to decode and encode a PNG with
+a single function call, and extended versions of these functions taking a
+LodePNGState struct allowing to specify or get more information. By default
+the colors of the raw image are always RGB or RGBA, no matter what color type
+the PNG file uses. To read and write files, there are simple functions to
+convert the files to/from buffers in memory.
+
+This all makes LodePNG suitable for loading textures in games, demos and small
+programs, ... It's less suitable for full fledged image editors, loading PNGs
+over network (it requires all the image data to be available before decoding can
+begin), life-critical systems, ...
+
+1.1. supported features
+-----------------------
+
+The following features are supported by the decoder:
+
+*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image,
+   or the same color type as the PNG
+*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image
+*) Adam7 interlace and deinterlace for any color type
+*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk
+*) support for alpha channels, including RGBA color model, translucent palettes and color keying
+*) zlib decompression (inflate)
+*) zlib compression (deflate)
+*) CRC32 and ADLER32 checksums
+*) colorimetric color profile conversions: currently experimentally available in lodepng_util.cpp only,
+   plus alternatively ability to pass on chroma/gamma/ICC profile information to other color management system.
+*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks.
+*) the following chunks are supported by both encoder and decoder:
+    IHDR: header information
+    PLTE: color palette
+    IDAT: pixel data
+    IEND: the final chunk
+    tRNS: transparency for palettized images
+    tEXt: textual information
+    zTXt: compressed textual information
+    iTXt: international textual information
+    bKGD: suggested background color
+    pHYs: physical dimensions
+    tIME: modification time
+    cHRM: RGB chromaticities
+    gAMA: RGB gamma correction
+    iCCP: ICC color profile
+    sRGB: rendering intent
+
+1.2. features not supported
+---------------------------
+
+The following features are _not_ supported:
+
+*) some features needed to make a conformant PNG-Editor might be still missing.
+*) partial loading/stream processing. All data must be available and is processed in one call.
+*) The following public chunks are not (yet) supported but treated as unknown chunks by LodePNG:
+    sBIT
+    hIST
+    sPLT
+
+
+2. C and C++ version
+--------------------
+
+The C version uses buffers allocated with alloc that you need to free()
+yourself. You need to use init and cleanup functions for each struct whenever
+using a struct from the C version to avoid exploits and memory leaks.
+
+The C++ version has extra functions with std::vectors in the interface and the
+lodepng::State class which is a LodePNGState with constructor and destructor.
+
+These files work without modification for both C and C++ compilers because all
+the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers
+ignore it, and the C code is made to compile both with strict ISO C90 and C++.
+
+To use the C++ version, you need to rename the source file to lodepng.cpp
+(instead of lodepng.c), and compile it with a C++ compiler.
+
+To use the C version, you need to rename the source file to lodepng.c (instead
+of lodepng.cpp), and compile it with a C compiler.
+
+
+3. Security
+-----------
+
+Even if carefully designed, it's always possible that LodePNG contains possible
+exploits. If you discover one, please let me know, and it will be fixed.
+
+When using LodePNG, care has to be taken with the C version of LodePNG, as well
+as the C-style structs when working with C++. The following conventions are used
+for all C-style structs:
+
+-if a struct has a corresponding init function, always call the init function when making a new one
+-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks
+-if a struct has a corresponding copy function, use the copy function instead of "=".
+ The destination must also be inited already.
+
+
+4. Decoding
+-----------
+
+Decoding converts a PNG compressed image to a raw pixel buffer.
+
+Most documentation on using the decoder is at its declarations in the header
+above. For C, simple decoding can be done with functions such as
+lodepng_decode32, and more advanced decoding can be done with the struct
+LodePNGState and lodepng_decode. For C++, all decoding can be done with the
+various lodepng::decode functions, and lodepng::State can be used for advanced
+features.
+
+When using the LodePNGState, it uses the following fields for decoding:
+*) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here
+*) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get
+*) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use
+
+LodePNGInfo info_png
+--------------------
+
+After decoding, this contains extra information of the PNG image, except the actual
+pixels, width and height because these are already gotten directly from the decoder
+functions.
+
+It contains for example the original color type of the PNG image, text comments,
+suggested background color, etc... More details about the LodePNGInfo struct are
+at its declaration documentation.
+
+LodePNGColorMode info_raw
+-------------------------
+
+When decoding, here you can specify which color type you want
+the resulting raw image to be. If this is different from the colortype of the
+PNG, then the decoder will automatically convert the result. This conversion
+always works, except if you want it to convert a color PNG to grayscale or to
+a palette with missing colors.
+
+By default, 32-bit color is used for the result.
+
+LodePNGDecoderSettings decoder
+------------------------------
+
+The settings can be used to ignore the errors created by invalid CRC and Adler32
+chunks, and to disable the decoding of tEXt chunks.
+
+There's also a setting color_convert, true by default. If false, no conversion
+is done, the resulting data will be as it was in the PNG (after decompression)
+and you'll have to puzzle the colors of the pixels together yourself using the
+color type information in the LodePNGInfo.
+
+
+5. Encoding
+-----------
+
+Encoding converts a raw pixel buffer to a PNG compressed image.
+
+Most documentation on using the encoder is at its declarations in the header
+above. For C, simple encoding can be done with functions such as
+lodepng_encode32, and more advanced decoding can be done with the struct
+LodePNGState and lodepng_encode. For C++, all encoding can be done with the
+various lodepng::encode functions, and lodepng::State can be used for advanced
+features.
+
+Like the decoder, the encoder can also give errors. However it gives less errors
+since the encoder input is trusted, the decoder input (a PNG image that could
+be forged by anyone) is not trusted.
+
+When using the LodePNGState, it uses the following fields for encoding:
+*) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be.
+*) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has
+*) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use
+
+LodePNGInfo info_png
+--------------------
+
+When encoding, you use this the opposite way as when decoding: for encoding,
+you fill in the values you want the PNG to have before encoding. By default it's
+not needed to specify a color type for the PNG since it's automatically chosen,
+but it's possible to choose it yourself given the right settings.
+
+The encoder will not always exactly match the LodePNGInfo struct you give,
+it tries as close as possible. Some things are ignored by the encoder. The
+encoder uses, for example, the following settings from it when applicable:
+colortype and bitdepth, text chunks, time chunk, the color key, the palette, the
+background color, the interlace method, unknown chunks, ...
+
+When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk.
+If the palette contains any colors for which the alpha channel is not 255 (so
+there are translucent colors in the palette), it'll add a tRNS chunk.
+
+LodePNGColorMode info_raw
+-------------------------
+
+You specify the color type of the raw image that you give to the input here,
+including a possible transparent color key and palette you happen to be using in
+your raw image data.
+
+By default, 32-bit color is assumed, meaning your input has to be in RGBA
+format with 4 bytes (unsigned chars) per pixel.
+
+LodePNGEncoderSettings encoder
+------------------------------
+
+The following settings are supported (some are in sub-structs):
+*) auto_convert: when this option is enabled, the encoder will
+automatically choose the smallest possible color mode (including color key) that
+can encode the colors of all pixels without information loss.
+*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree,
+   2 = dynamic huffman tree (best compression). Should be 2 for proper
+   compression.
+*) use_lz77: whether or not to use LZ77 for compressed block types. Should be
+   true for proper compression.
+*) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value
+   2048 by default, but can be set to 32768 for better, but slow, compression.
+*) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE
+   chunk if force_palette is true. This can used as suggested palette to convert
+   to by viewers that don't support more than 256 colors (if those still exist)
+*) add_id: add text chunk "Encoder: LodePNG <version>" to the image.
+*) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks.
+  zTXt chunks use zlib compression on the text. This gives a smaller result on
+  large texts but a larger result on small texts (such as a single program name).
+  It's all tEXt or all zTXt though, there's no separate setting per text yet.
+
+
+6. color conversions
+--------------------
+
+An important thing to note about LodePNG, is that the color type of the PNG, and
+the color type of the raw image, are completely independent. By default, when
+you decode a PNG, you get the result as a raw image in the color type you want,
+no matter whether the PNG was encoded with a palette, grayscale or RGBA color.
+And if you encode an image, by default LodePNG will automatically choose the PNG
+color type that gives good compression based on the values of colors and amount
+of colors in the image. It can be configured to let you control it instead as
+well, though.
+
+To be able to do this, LodePNG does conversions from one color mode to another.
+It can convert from almost any color type to any other color type, except the
+following conversions: RGB to grayscale is not supported, and converting to a
+palette when the palette doesn't have a required color is not supported. This is
+not supported on purpose: this is information loss which requires a color
+reduction algorithm that is beyond the scope of a PNG encoder (yes, RGB to gray
+is easy, but there are multiple ways if you want to give some channels more
+weight).
+
+By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB
+color, no matter what color type the PNG has. And by default when encoding,
+LodePNG automatically picks the best color model for the output PNG, and expects
+the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control
+the color format of the images yourself, you can skip this chapter.
+
+6.1. PNG color types
+--------------------
+
+A PNG image can have many color types, ranging from 1-bit color to 64-bit color,
+as well as palettized color modes. After the zlib decompression and unfiltering
+in the PNG image is done, the raw pixel data will have that color type and thus
+a certain amount of bits per pixel. If you want the output raw image after
+decoding to have another color type, a conversion is done by LodePNG.
+
+The PNG specification gives the following color types:
+
+0: grayscale, bit depths 1, 2, 4, 8, 16
+2: RGB, bit depths 8 and 16
+3: palette, bit depths 1, 2, 4 and 8
+4: grayscale with alpha, bit depths 8 and 16
+6: RGBA, bit depths 8 and 16
+
+Bit depth is the amount of bits per pixel per color channel. So the total amount
+of bits per pixel is: amount of channels * bitdepth.
+
+6.2. color conversions
+----------------------
+
+As explained in the sections about the encoder and decoder, you can specify
+color types and bit depths in info_png and info_raw to change the default
+behaviour.
+
+If, when decoding, you want the raw image to be something else than the default,
+you need to set the color type and bit depth you want in the LodePNGColorMode,
+or the parameters colortype and bitdepth of the simple decoding function.
+
+If, when encoding, you use another color type than the default in the raw input
+image, you need to specify its color type and bit depth in the LodePNGColorMode
+of the raw image, or use the parameters colortype and bitdepth of the simple
+encoding function.
+
+If, when encoding, you don't want LodePNG to choose the output PNG color type
+but control it yourself, you need to set auto_convert in the encoder settings
+to false, and specify the color type you want in the LodePNGInfo of the
+encoder (including palette: it can generate a palette if auto_convert is true,
+otherwise not).
+
+If the input and output color type differ (whether user chosen or auto chosen),
+LodePNG will do a color conversion, which follows the rules below, and may
+sometimes result in an error.
+
+To avoid some confusion:
+-the decoder converts from PNG to raw image
+-the encoder converts from raw image to PNG
+-the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image
+-the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG
+-when encoding, the color type in LodePNGInfo is ignored if auto_convert
+ is enabled, it is automatically generated instead
+-when decoding, the color type in LodePNGInfo is set by the decoder to that of the original
+ PNG image, but it can be ignored since the raw image has the color type you requested instead
+-if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion
+ between the color types is done if the color types are supported. If it is not
+ supported, an error is returned. If the types are the same, no conversion is done.
+-even though some conversions aren't supported, LodePNG supports loading PNGs from any
+ colortype and saving PNGs to any colortype, sometimes it just requires preparing
+ the raw image correctly before encoding.
+-both encoder and decoder use the same color converter.
+
+The function lodepng_convert does the color conversion. It is available in the
+interface but normally isn't needed since the encoder and decoder already call
+it.
+
+Non supported color conversions:
+-color to grayscale when non-gray pixels are present: no error is thrown, but
+the result will look ugly because only the red channel is taken (it assumes all
+three channels are the same in this case so ignores green and blue). The reason
+no error is given is to allow converting from three-channel grayscale images to
+one-channel even if there are numerical imprecisions.
+-anything to palette when the palette does not have an exact match for a from-color
+in it: in this case an error is thrown
+
+Supported color conversions:
+-anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA
+-any gray or gray+alpha, to gray or gray+alpha
+-anything to a palette, as long as the palette has the requested colors in it
+-removing alpha channel
+-higher to smaller bitdepth, and vice versa
+
+If you want no color conversion to be done (e.g. for speed or control):
+-In the encoder, you can make it save a PNG with any color type by giving the
+raw color mode and LodePNGInfo the same color mode, and setting auto_convert to
+false.
+-In the decoder, you can make it store the pixel data in the same color type
+as the PNG has, by setting the color_convert setting to false. Settings in
+info_raw are then ignored.
+
+6.3. padding bits
+-----------------
+
+In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines
+have a bit amount that isn't a multiple of 8, then padding bits are used so that each
+scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output.
+The raw input image you give to the encoder, and the raw output image you get from the decoder
+will NOT have these padding bits, e.g. in the case of a 1-bit image with a width
+of 7 pixels, the first pixel of the second scanline will the 8th bit of the first byte,
+not the first bit of a new byte.
+
+6.4. A note about 16-bits per channel and endianness
+----------------------------------------------------
+
+LodePNG uses unsigned char arrays for 16-bit per channel colors too, just like
+for any other color format. The 16-bit values are stored in big endian (most
+significant byte first) in these arrays. This is the opposite order of the
+little endian used by x86 CPU's.
+
+LodePNG always uses big endian because the PNG file format does so internally.
+Conversions to other formats than PNG uses internally are not supported by
+LodePNG on purpose, there are myriads of formats, including endianness of 16-bit
+colors, the order in which you store R, G, B and A, and so on. Supporting and
+converting to/from all that is outside the scope of LodePNG.
+
+This may mean that, depending on your use case, you may want to convert the big
+endian output of LodePNG to little endian with a for loop. This is certainly not
+always needed, many applications and libraries support big endian 16-bit colors
+anyway, but it means you cannot simply cast the unsigned char* buffer to an
+unsigned short* buffer on x86 CPUs.
+
+
+7. error values
+---------------
+
+All functions in LodePNG that return an error code, return 0 if everything went
+OK, or a non-zero code if there was an error.
+
+The meaning of the LodePNG error values can be retrieved with the function
+lodepng_error_text: given the numerical error code, it returns a description
+of the error in English as a string.
+
+Check the implementation of lodepng_error_text to see the meaning of each code.
+
+It is not recommended to use the numerical values to programmatically make
+different decisions based on error types as the numbers are not guaranteed to
+stay backwards compatible. They are for human consumption only. Programmatically
+only 0 or non-0 matter.
+
+
+8. chunks and PNG editing
+-------------------------
+
+If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG
+editor that should follow the rules about handling of unknown chunks, or if your
+program is able to read other types of chunks than the ones handled by LodePNG,
+then that's possible with the chunk functions of LodePNG.
+
+A PNG chunk has the following layout:
+
+4 bytes length
+4 bytes type name
+length bytes data
+4 bytes CRC
+
+8.1. iterating through chunks
+-----------------------------
+
+If you have a buffer containing the PNG image data, then the first chunk (the
+IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the
+signature of the PNG and are not part of a chunk. But if you start at byte 8
+then you have a chunk, and can check the following things of it.
+
+NOTE: none of these functions check for memory buffer boundaries. To avoid
+exploits, always make sure the buffer contains all the data of the chunks.
+When using lodepng_chunk_next, make sure the returned value is within the
+allocated memory.
+
+unsigned lodepng_chunk_length(const unsigned char* chunk):
+
+Get the length of the chunk's data. The total chunk length is this length + 12.
+
+void lodepng_chunk_type(char type[5], const unsigned char* chunk):
+unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type):
+
+Get the type of the chunk or compare if it's a certain type
+
+unsigned char lodepng_chunk_critical(const unsigned char* chunk):
+unsigned char lodepng_chunk_private(const unsigned char* chunk):
+unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk):
+
+Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are).
+Check if the chunk is private (public chunks are part of the standard, private ones not).
+Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical
+chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your
+program doesn't handle that type of unknown chunk.
+
+unsigned char* lodepng_chunk_data(unsigned char* chunk):
+const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk):
+
+Get a pointer to the start of the data of the chunk.
+
+unsigned lodepng_chunk_check_crc(const unsigned char* chunk):
+void lodepng_chunk_generate_crc(unsigned char* chunk):
+
+Check if the crc is correct or generate a correct one.
+
+unsigned char* lodepng_chunk_next(unsigned char* chunk):
+const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk):
+
+Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these
+functions do no boundary checking of the allocated data whatsoever, so make sure there is enough
+data available in the buffer to be able to go to the next chunk.
+
+unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk):
+unsigned lodepng_chunk_create(unsigned char** out, size_t* outsize, unsigned length,
+                              const char* type, const unsigned char* data):
+
+These functions are used to create new chunks that are appended to the data in *out that has
+length *outsize. The append function appends an existing chunk to the new data. The create
+function creates a new chunk with the given parameters and appends it. Type is the 4-letter
+name of the chunk.
+
+8.2. chunks in info_png
+-----------------------
+
+The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3
+buffers (each with size) to contain 3 types of unknown chunks:
+the ones that come before the PLTE chunk, the ones that come between the PLTE
+and the IDAT chunks, and the ones that come after the IDAT chunks.
+It's necessary to make the distinction between these 3 cases because the PNG
+standard forces to keep the ordering of unknown chunks compared to the critical
+chunks, but does not force any other ordering rules.
+
+info_png.unknown_chunks_data[0] is the chunks before PLTE
+info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT
+info_png.unknown_chunks_data[2] is the chunks after IDAT
+
+The chunks in these 3 buffers can be iterated through and read by using the same
+way described in the previous subchapter.
+
+When using the decoder to decode a PNG, you can make it store all unknown chunks
+if you set the option settings.remember_unknown_chunks to 1. By default, this
+option is off (0).
+
+The encoder will always encode unknown chunks that are stored in the info_png.
+If you need it to add a particular chunk that isn't known by LodePNG, you can
+use lodepng_chunk_append or lodepng_chunk_create to the chunk data in
+info_png.unknown_chunks_data[x].
+
+Chunks that are known by LodePNG should not be added in that way. E.g. to make
+LodePNG add a bKGD chunk, set background_defined to true and add the correct
+parameters there instead.
+
+
+9. compiler support
+-------------------
+
+No libraries other than the current standard C library are needed to compile
+LodePNG. For the C++ version, only the standard C++ library is needed on top.
+Add the files lodepng.c(pp) and lodepng.h to your project, include
+lodepng.h where needed, and your program can read/write PNG files.
+
+It is compatible with C90 and up, and C++03 and up.
+
+If performance is important, use optimization when compiling! For both the
+encoder and decoder, this makes a large difference.
+
+Make sure that LodePNG is compiled with the same compiler of the same version
+and with the same settings as the rest of the program, or the interfaces with
+std::vectors and std::strings in C++ can be incompatible.
+
+CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets.
+
+*) gcc and g++
+
+LodePNG is developed in gcc so this compiler is natively supported. It gives no
+warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++
+version 4.7.1 on Linux, 32-bit and 64-bit.
+
+*) Clang
+
+Fully supported and warning-free.
+
+*) Mingw
+
+The Mingw compiler (a port of gcc for Windows) should be fully supported by
+LodePNG.
+
+*) Visual Studio and Visual C++ Express Edition
+
+LodePNG should be warning-free with warning level W4. Two warnings were disabled
+with pragmas though: warning 4244 about implicit conversions, and warning 4996
+where it wants to use a non-standard function fopen_s instead of the standard C
+fopen.
+
+Visual Studio may want "stdafx.h" files to be included in each source file and
+give an error "unexpected end of file while looking for precompiled header".
+This is not standard C++ and will not be added to the stock LodePNG. You can
+disable it for lodepng.cpp only by right clicking it, Properties, C/C++,
+Precompiled Headers, and set it to Not Using Precompiled Headers there.
+
+NOTE: Modern versions of VS should be fully supported, but old versions, e.g.
+VS6, are not guaranteed to work.
+
+*) Compilers on Macintosh
+
+LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for
+C and C++.
+
+*) Other Compilers
+
+If you encounter problems on any compilers, feel free to let me know and I may
+try to fix it if the compiler is modern and standards compliant.
+
+
+10. examples
+------------
+
+This decoder example shows the most basic usage of LodePNG. More complex
+examples can be found on the LodePNG website.
+
+NOTE: these examples do not support wide-character filenames, you can use an
+external method to handle such files and encode or decode in-memory
+
+10.1. decoder C++ example
+-------------------------
+
+#include "lodepng.h"
+#include <iostream>
+
+int main(int argc, char *argv[]) {
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  //load and decode
+  std::vector<unsigned char> image;
+  unsigned width, height;
+  unsigned error = lodepng::decode(image, width, height, filename);
+
+  //if there's an error, display it
+  if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl;
+
+  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
+}
+
+10.2. decoder C example
+-----------------------
+
+#include "lodepng.h"
+
+int main(int argc, char *argv[]) {
+  unsigned error;
+  unsigned char* image;
+  size_t width, height;
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  error = lodepng_decode32_file(&image, &width, &height, filename);
+
+  if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error));
+
+  / * use image here * /
+
+  free(image);
+  return 0;
+}
+
+11. state settings reference
+----------------------------
+
+A quick reference of some settings to set on the LodePNGState
+
+For decoding:
+
+state.decoder.zlibsettings.ignore_adler32: ignore ADLER32 checksums
+state.decoder.zlibsettings.custom_...: use custom inflate function
+state.decoder.ignore_crc: ignore CRC checksums
+state.decoder.ignore_critical: ignore unknown critical chunks
+state.decoder.ignore_end: ignore missing IEND chunk. May fail if this corruption causes other errors
+state.decoder.color_convert: convert internal PNG color to chosen one
+state.decoder.read_text_chunks: whether to read in text metadata chunks
+state.decoder.remember_unknown_chunks: whether to read in unknown chunks
+state.info_raw.colortype: desired color type for decoded image
+state.info_raw.bitdepth: desired bit depth for decoded image
+state.info_raw....: more color settings, see struct LodePNGColorMode
+state.info_png....: no settings for decoder but ouput, see struct LodePNGInfo
+
+For encoding:
+
+state.encoder.zlibsettings.btype: disable compression by setting it to 0
+state.encoder.zlibsettings.use_lz77: use LZ77 in compression
+state.encoder.zlibsettings.windowsize: tweak LZ77 windowsize
+state.encoder.zlibsettings.minmatch: tweak min LZ77 length to match
+state.encoder.zlibsettings.nicematch: tweak LZ77 match where to stop searching
+state.encoder.zlibsettings.lazymatching: try one more LZ77 matching
+state.encoder.zlibsettings.custom_...: use custom deflate function
+state.encoder.auto_convert: choose optimal PNG color type, if 0 uses info_png
+state.encoder.filter_palette_zero: PNG filter strategy for palette
+state.encoder.filter_strategy: PNG filter strategy to encode with
+state.encoder.force_palette: add palette even if not encoding to one
+state.encoder.add_id: add LodePNG identifier and version as a text chunk
+state.encoder.text_compression: use compressed text chunks for metadata
+state.info_raw.colortype: color type of raw input image you provide
+state.info_raw.bitdepth: bit depth of raw input image you provide
+state.info_raw: more color settings, see struct LodePNGColorMode
+state.info_png.color.colortype: desired color type if auto_convert is false
+state.info_png.color.bitdepth: desired bit depth if auto_convert is false
+state.info_png.color....: more color settings, see struct LodePNGColorMode
+state.info_png....: more PNG related settings, see struct LodePNGInfo
+
+
+12. changes
+-----------
+
+The version number of LodePNG is the date of the change given in the format
+yyyymmdd.
+
+Some changes aren't backwards compatible. Those are indicated with a (!)
+symbol.
+
+Not all changes are listed here, the commit history in github lists more:
+https://github.com/lvandeve/lodepng
+
+*) 27 jun 2021: added warnings that file reading/writing functions don't support
+   wide-character filenames (support for this is not planned, opening files is
+   not the core part of PNG decoding/decoding and is platform dependent).
+*) 17 okt 2020: prevent decoding too large text/icc chunks by default.
+*) 06 mar 2020: simplified some of the dynamic memory allocations.
+*) 12 jan 2020: (!) added 'end' argument to lodepng_chunk_next to allow correct
+   overflow checks.
+*) 14 aug 2019: around 25% faster decoding thanks to huffman lookup tables.
+*) 15 jun 2019: (!) auto_choose_color API changed (for bugfix: don't use palette
+   if gray ICC profile) and non-ICC LodePNGColorProfile renamed to
+   LodePNGColorStats.
+*) 30 dec 2018: code style changes only: removed newlines before opening braces.
+*) 10 sep 2018: added way to inspect metadata chunks without full decoding.
+*) 19 aug 2018: (!) fixed color mode bKGD is encoded with and made it use
+   palette index in case of palette.
+*) 10 aug 2018: (!) added support for gAMA, cHRM, sRGB and iCCP chunks. This
+   change is backwards compatible unless you relied on unknown_chunks for those.
+*) 11 jun 2018: less restrictive check for pixel size integer overflow
+*) 14 jan 2018: allow optionally ignoring a few more recoverable errors
+*) 17 sep 2017: fix memory leak for some encoder input error cases
+*) 27 nov 2016: grey+alpha auto color model detection bugfix
+*) 18 apr 2016: Changed qsort to custom stable sort (for platforms w/o qsort).
+*) 09 apr 2016: Fixed colorkey usage detection, and better file loading (within
+   the limits of pure C90).
+*) 08 dec 2015: Made load_file function return error if file can't be opened.
+*) 24 okt 2015: Bugfix with decoding to palette output.
+*) 18 apr 2015: Boundary PM instead of just package-merge for faster encoding.
+*) 24 aug 2014: Moved to github
+*) 23 aug 2014: Reduced needless memory usage of decoder.
+*) 28 jun 2014: Removed fix_png setting, always support palette OOB for
+    simplicity. Made ColorProfile public.
+*) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization.
+*) 22 dec 2013: Power of two windowsize required for optimization.
+*) 15 apr 2013: Fixed bug with LAC_ALPHA and color key.
+*) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png).
+*) 11 mar 2013: (!) Bugfix with custom free. Changed from "my" to "lodepng_"
+    prefix for the custom allocators and made it possible with a new #define to
+    use custom ones in your project without needing to change lodepng's code.
+*) 28 jan 2013: Bugfix with color key.
+*) 27 okt 2012: Tweaks in text chunk keyword length error handling.
+*) 8 okt 2012: (!) Added new filter strategy (entropy) and new auto color mode.
+    (no palette). Better deflate tree encoding. New compression tweak settings.
+    Faster color conversions while decoding. Some internal cleanups.
+*) 23 sep 2012: Reduced warnings in Visual Studio a little bit.
+*) 1 sep 2012: (!) Removed #define's for giving custom (de)compression functions
+    and made it work with function pointers instead.
+*) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc
+    and free functions and toggle #defines from compiler flags. Small fixes.
+*) 6 may 2012: (!) Made plugging in custom zlib/deflate functions more flexible.
+*) 22 apr 2012: (!) Made interface more consistent, renaming a lot. Removed
+    redundant C++ codec classes. Reduced amount of structs. Everything changed,
+    but it is cleaner now imho and functionality remains the same. Also fixed
+    several bugs and shrunk the implementation code. Made new samples.
+*) 6 nov 2011: (!) By default, the encoder now automatically chooses the best
+    PNG color model and bit depth, based on the amount and type of colors of the
+    raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color.
+*) 9 okt 2011: simpler hash chain implementation for the encoder.
+*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching.
+*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking.
+    A bug with the PNG filtertype heuristic was fixed, so that it chooses much
+    better ones (it's quite significant). A setting to do an experimental, slow,
+    brute force search for PNG filter types is added.
+*) 17 aug 2011: (!) changed some C zlib related function names.
+*) 16 aug 2011: made the code less wide (max 120 characters per line).
+*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors.
+*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled.
+*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman
+    to optimize long sequences of zeros.
+*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and
+    LodePNG_InfoColor_canHaveAlpha functions for convenience.
+*) 7 nov 2010: added LodePNG_error_text function to get error code description.
+*) 30 okt 2010: made decoding slightly faster
+*) 26 okt 2010: (!) changed some C function and struct names (more consistent).
+     Reorganized the documentation and the declaration order in the header.
+*) 08 aug 2010: only changed some comments and external samples.
+*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version.
+*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers.
+*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could
+    read by ignoring the problem but windows apps couldn't.
+*) 06 jun 2008: added more error checks for out of memory cases.
+*) 26 apr 2008: added a few more checks here and there to ensure more safety.
+*) 06 mar 2008: crash with encoding of strings fixed
+*) 02 feb 2008: support for international text chunks added (iTXt)
+*) 23 jan 2008: small cleanups, and #defines to divide code in sections
+*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor.
+*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder.
+*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added
+    Also various fixes, such as in the deflate and the padding bits code.
+*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved
+    filtering code of encoder.
+*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A
+    C++ wrapper around this provides an interface almost identical to before.
+    Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code
+    are together in these files but it works both for C and C++ compilers.
+*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks
+*) 30 aug 2007: bug fixed which makes this Borland C++ compatible
+*) 09 aug 2007: some VS2005 warnings removed again
+*) 21 jul 2007: deflate code placed in new namespace separate from zlib code
+*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images
+*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing
+    invalid std::vector element [0] fixed, and level 3 and 4 warnings removed
+*) 02 jun 2007: made the encoder add a tag with version by default
+*) 27 may 2007: zlib and png code separated (but still in the same file),
+    simple encoder/decoder functions added for more simple usage cases
+*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69),
+    moved some examples from here to lodepng_examples.cpp
+*) 12 may 2007: palette decoding bug fixed
+*) 24 apr 2007: changed the license from BSD to the zlib license
+*) 11 mar 2007: very simple addition: ability to encode bKGD chunks.
+*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding
+    palettized PNG images. Plus little interface change with palette and texts.
+*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes.
+    Fixed a bug where the end code of a block had length 0 in the Huffman tree.
+*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented
+    and supported by the encoder, resulting in smaller PNGs at the output.
+*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone.
+*) 24 jan 2007: gave encoder an error interface. Added color conversion from any
+    greyscale type to 8-bit greyscale with or without alpha.
+*) 21 jan 2007: (!) Totally changed the interface. It allows more color types
+    to convert to and is more uniform. See the manual for how it works now.
+*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days:
+    encode/decode custom tEXt chunks, separate classes for zlib & deflate, and
+    at last made the decoder give errors for incorrect Adler32 or Crc.
+*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel.
+*) 29 dec 2006: Added support for encoding images without alpha channel, and
+    cleaned out code as well as making certain parts faster.
+*) 28 dec 2006: Added "Settings" to the encoder.
+*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now.
+    Removed some code duplication in the decoder. Fixed little bug in an example.
+*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter.
+    Fixed a bug of the decoder with 16-bit per color.
+*) 15 okt 2006: Changed documentation structure
+*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the
+    given image buffer, however for now it's not compressed.
+*) 08 sep 2006: (!) Changed to interface with a Decoder class
+*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different
+    way. Renamed decodePNG to decodePNGGeneric.
+*) 29 jul 2006: (!) Changed the interface: image info is now returned as a
+    struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy.
+*) 28 jul 2006: Cleaned the code and added new error checks.
+    Corrected terminology "deflate" into "inflate".
+*) 23 jun 2006: Added SDL example in the documentation in the header, this
+    example allows easy debugging by displaying the PNG and its transparency.
+*) 22 jun 2006: (!) Changed way to obtain error value. Added
+    loadFile function for convenience. Made decodePNG32 faster.
+*) 21 jun 2006: (!) Changed type of info vector to unsigned.
+    Changed position of palette in info vector. Fixed an important bug that
+    happened on PNGs with an uncompressed block.
+*) 16 jun 2006: Internally changed unsigned into unsigned where
+    needed, and performed some optimizations.
+*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them
+    in LodePNG namespace. Changed the order of the parameters. Rewrote the
+    documentation in the header. Renamed files to lodepng.cpp and lodepng.h
+*) 22 apr 2006: Optimized and improved some code
+*) 07 sep 2005: (!) Changed to std::vector interface
+*) 12 aug 2005: Initial release (C++, decoder only)
+
+
+13. contact information
+-----------------------
+
+Feel free to contact me with suggestions, problems, comments, ... concerning
+LodePNG. If you encounter a PNG image that doesn't work properly with this
+decoder, feel free to send it and I'll use it to find and fix the problem.
+
+My email address is (puzzle the account and domain together with an @ symbol):
+Domain: gmail dot com.
+Account: lode dot vandevenne.
+
+
+Copyright (c) 2005-2021 Lode Vandevenne
+*/
diff --git a/gbdk/gbdk-support/png2asset/png2asset.cpp b/gbdk/gbdk-support/png2asset/png2asset.cpp
new file mode 100644
index 00000000..3016c065
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/png2asset.cpp
@@ -0,0 +1,1339 @@
+#include <vector>
+#include <string>
+#include <algorithm>
+#include <cstring>
+#include <set>
+#include <stdio.h>
+#include <fstream>
+#include "lodepng.h"
+
+using namespace std;
+
+int decodePNG(vector<unsigned char>& out_image, unsigned long& image_width, unsigned long& image_height, const unsigned char* in_png, size_t in_size, bool convert_to_rgba32 = true);
+void loadFile(vector<unsigned char>& buffer, const std::string& filename);
+
+#define BIT(VALUE, INDEX) (1 & ((VALUE) >> (INDEX)))
+
+bool export_as_map = false;
+bool use_map_attributes = false;
+size_t pal_size;
+#define TILE_W 8
+int tile_h;
+int bpp = 2;
+unsigned int tile_origin = 0; // Default to no tile index offset
+
+struct Tile
+{
+	vector< unsigned char > data;
+	unsigned char pal;
+
+	Tile(size_t size = 0) : data(size), pal(0) {}
+	bool operator==(const Tile& t) const
+	{
+		return data == t.data && pal == t.pal;
+	}
+
+	const Tile& operator=(const Tile& t)
+	{
+		data = t.data;
+		pal = t.pal;
+		return *this;
+	}
+
+	enum PackMode {
+		GB,
+		SGB,
+		SMS,
+	};
+
+	vector< unsigned char > GetPackedData(PackMode pack_mode) {
+		vector< unsigned char > ret(tile_h * bpp, 0);
+		if(pack_mode == GB) {
+			for(int j = 0; j < tile_h; ++j) {
+				for(int i = 0; i < 8; ++ i) {
+					unsigned char col = data[8 * j + i];
+					ret[j * 2    ] |= BIT(col, 0) << (7 - i);
+					ret[j * 2 + 1] |= BIT(col, 1) << (7 - i);
+				}
+			}
+		}
+		else if(pack_mode == SGB)
+		{
+			for(int j = 0; j < tile_h; ++j) {
+				for(int i = 0; i < 8; ++ i) {
+					unsigned char col = data[8 * j + i];
+					ret[j * 2    ] |= BIT(col, 0) << (7 - i);
+					ret[j * 2 + 1] |= BIT(col, 1) << (7 - i);
+					ret[(tile_h + j) * 2    ] |= BIT(col, 2) << (7 - i);
+					ret[(tile_h + j) * 2 + 1] |= BIT(col, 3) << (7 - i);
+				}
+			}
+		}
+		else if(pack_mode == SMS)
+		{
+			for(int j = 0; j < tile_h; ++j) {
+				for(int i = 0; i < 8; ++ i) {
+					unsigned char col = data[8 * j + i];
+					ret[j * 4    ] |= BIT(col, 0) << (7 - i);
+					ret[j * 4 + 1] |= BIT(col, 1) << (7 - i);
+					ret[j * 4 + 2] |= BIT(col, 2) << (7 - i);
+					ret[j * 4 + 3] |= BIT(col, 3) << (7 - i);
+				}
+			}
+		}
+		return ret;
+	}
+};
+
+struct PNGImage
+{
+	vector< unsigned char > data; //data in indexed format
+	unsigned int w;
+	unsigned int h;
+
+	size_t palettesize; //number of palette colors
+	unsigned char* palette; //palette colors in RGBA (1 color == 4 bytes)
+
+	unsigned char GetGBColor(int x, int y)
+	{
+		return data[w * y + x] % pal_size;
+	}
+
+	bool ExtractGBTile(int x, int y, int tile_h, Tile& tile)
+	{
+		tile.pal = (export_as_map && !use_map_attributes) ? data[w * y + x] >> 2 : 0; //Set the palette to 0 when pals are not stored in tiles to allow tiles to be equal even when their palettes are different
+
+		bool all_zero = true;
+		for(int j = 0; j < tile_h; ++ j)
+		{
+			for(int i = 0; i < 8; ++i)
+			{
+				unsigned char color_idx = GetGBColor(x + i, y + j);
+				tile.data[j * 8 + i] = color_idx;
+				all_zero = all_zero && (color_idx == 0);
+			}
+		}
+		return !all_zero;
+	}
+};
+
+struct MTTile
+{
+	char offset_x;
+	char offset_y;
+	unsigned char offset_idx;
+	unsigned char props;
+
+	MTTile(char offset_x, char offset_y, unsigned char offset_idx, unsigned char props) : offset_x(offset_x), offset_y(offset_y), offset_idx(offset_idx), props(props) {}
+	MTTile() : offset_x(0), offset_y(0), offset_idx(0), props(0) {}
+};
+string source_tileset;
+unsigned int extra_tile_count = 0;
+unsigned int source_palette_count = 0;
+unsigned int source_tileset_size = 0;
+bool includeTileData = true;
+bool includedMapOrMetaspriteData = true;
+PNGImage source_tileset_image;
+bool use_source_tileset = false;
+bool keep_duplicate_tiles = false;
+
+typedef vector< MTTile > MetaSprite;
+vector< Tile > tiles;
+vector<	MetaSprite > sprites;
+vector< unsigned char > map;
+vector< unsigned char > map_attributes;
+PNGImage image;
+int props_default = 0x00;  // Default Sprite props has no attributes enabled
+bool use_structs = false;
+bool flip_tiles = true;
+Tile::PackMode pack_mode = Tile::GB;
+
+Tile FlipH(const Tile& tile)
+{
+	Tile ret;
+	for(int j = (int)tile.data.size() - 8; j >= 0; j -= 8)
+	{
+		for(int i = 0; i < 8; ++ i)
+		{
+			ret.data.push_back(tile.data[j + i]);
+		}
+	}
+	ret.pal = tile.pal;
+	return ret;
+}
+
+Tile FlipV(const Tile& tile)
+{
+	Tile ret;
+	for(int j = 0; j < (int)tile.data.size(); j += 8)
+	{
+		for(int i = 7; i >= 0; -- i)
+		{
+			ret.data.push_back(tile.data[j + i]);
+		}
+	}
+	ret.pal = tile.pal;
+	return ret;
+}
+
+bool FindTile(const Tile& t, size_t& idx, unsigned char& props)
+{
+	vector< Tile >::iterator it;
+	it = find(tiles.begin(), tiles.end(), t);
+	if(it != tiles.end())
+	{
+		idx = (size_t)(it - tiles.begin());
+		props = props_default;
+		return true;
+	}
+
+	if(flip_tiles)
+	{
+		Tile tile = FlipV(t);
+		it = find(tiles.begin(), tiles.end(), tile);
+		if(it != tiles.end())
+		{
+			idx = (size_t)(it - tiles.begin());
+			props = props_default | (1 << 5);
+			return true;
+		}
+
+		tile = FlipH(tile);
+		it = find(tiles.begin(), tiles.end(), tile);
+		if(it != tiles.end())
+		{
+			idx = (size_t)(it - tiles.begin());
+			props = props_default | (1 << 5) | (1 << 6);
+			return true;
+		}
+
+		tile = FlipV(tile);
+		it = find(tiles.begin(), tiles.end(), tile);
+		if(it != tiles.end())
+		{
+			idx = (size_t)(it - tiles.begin());
+			props = props_default | (1 << 6);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+void GetMetaSprite(int _x, int _y, int _w, int _h, int pivot_x, int pivot_y)
+{
+	int last_x = _x + pivot_x;
+	int last_y = _y + pivot_y;
+
+	sprites.push_back(MetaSprite());
+	MetaSprite& mt_sprite = sprites.back();
+	for(int y = _y; y < _y + _h && y < (int)image.h; y += tile_h)
+	{
+		for(int x = _x; x < _x + _w && x < (int)image.w; x += 8)
+		{
+			Tile tile(tile_h * 8);
+			if (image.ExtractGBTile(x, y, tile_h, tile))
+			{
+				size_t idx;
+				unsigned char props;
+				unsigned char pal_idx = image.data[y * image.w + x] >> 2; //We can pick the palette from the first pixel of this tile
+
+				if(keep_duplicate_tiles)
+				{
+					tiles.push_back(tile);
+					idx = tiles.size() - 1;
+					props = props_default;
+				}
+				else
+				{
+					if(!FindTile(tile, idx, props))
+					{
+						if (use_source_tileset) {
+							printf("found a tile not in the source tileset at %d,%d. The target tileset has %d extra tiles.\n", x, y,extra_tile_count+1);
+							extra_tile_count++;
+							includeTileData = true;
+						}
+						tiles.push_back(tile);
+						idx = tiles.size() - 1;
+						props = props_default;
+					}
+				}
+
+				props |= pal_idx;
+
+				if(tile_h == 16)
+					idx *= 2;
+
+				mt_sprite.push_back(MTTile(x - last_x, y - last_y, (unsigned char)idx, props));
+
+				last_x = x;
+				last_y = y;
+			}
+		}
+	}
+}
+
+void GetMap()
+{
+	for(int y = 0; y < (int)image.h; y += 8)
+	{
+		for(int x = 0; x < (int)image.w; x += 8)
+		{
+			Tile tile(8 * 8);
+			image.ExtractGBTile(x, y, 8, tile);
+
+			size_t idx;
+			unsigned char props;
+
+			if(keep_duplicate_tiles)
+			{
+				tiles.push_back(tile);
+				idx = tiles.size() - 1;
+				props = props_default;
+			}
+			else
+			{
+				if(!FindTile(tile, idx, props))
+				{
+					if (use_source_tileset) {
+						printf("found a tile not in the source tileset at %d,%d. The target tileset has %d extra tiles.\n", x, y, extra_tile_count + 1);
+						extra_tile_count++;
+						includeTileData = true;
+					}
+					tiles.push_back(tile);
+					idx = tiles.size() - 1;
+					props = props_default;
+
+					if(tiles.size() > 256 && pack_mode != Tile::SMS)
+						printf("Warning: found more than 256 tiles on x:%d,y:%d\n", x, y);
+
+					if(((tiles.size() + tile_origin) > 256) && (pack_mode != Tile::SMS))
+						printf("Warning: tile count (%d) + tile origin (%d) exceeds 256 at x:%d,y:%d\n", (unsigned int)tiles.size(), tile_origin, x, y);
+				}
+			}
+
+			map.push_back((unsigned char)idx + tile_origin);
+
+			if(use_map_attributes)
+			{
+				unsigned char pal_idx = image.data[y * image.w + x] >> bpp; //We can pick the palette from the first pixel of this tile
+				if(pack_mode == Tile::SGB)
+				{
+					props = props << 1; //Mirror flags in SGB are on bit 7
+					props |= (pal_idx + 4) << 2; //Pals are in bits 2,3,4 and need to go from 4 to 7
+					map.push_back(props); //Also they are stored within the map tiles
+				}
+				else if(pack_mode == Tile::SMS)
+				{
+					props = props >> 4;
+					if(idx > 255)
+						props |= 1;
+					map.push_back(props);
+				}
+				else
+				{
+					props |= pal_idx;
+					map_attributes.push_back(props);
+				}
+			}
+
+		}
+	}
+}
+//Functor to compare entries in SetPal
+struct CmpIntColor {
+  bool operator() (unsigned int const& c1, unsigned int const& c2) const
+  {
+    unsigned char* c1_ptr = (unsigned char*)&c1;
+		unsigned char* c2_ptr = (unsigned char*)&c2;
+
+		//Compare alpha first, transparent color is considered smaller
+		if(c1_ptr[0] != c2_ptr[0])
+		{
+			return c1_ptr[0] < c2_ptr[0];
+		}
+		else
+		{
+			unsigned int lum_1 = (unsigned int)(c1_ptr[3] * 0.299f + c1_ptr[2] * 0.587f + c1_ptr[1] * 0.114f);
+			unsigned int lum_2 = (unsigned int)(c2_ptr[3] * 0.299f + c2_ptr[2] * 0.587f + c2_ptr[1] * 0.114f);
+			return lum_1 > lum_2;
+		}
+  }
+};
+
+//This set will keep colors in the palette ordered based on their grayscale values to ensure they look good on DMG
+//This assumes the palette used in DMG will be 00 01 10 11
+typedef set< unsigned int, CmpIntColor > SetPal;
+
+SetPal GetPaletteColors(const PNGImage& image, int x, int y, int w, int h)
+{
+	SetPal ret;
+	for(int j = y; j < (y + h); ++ j)
+	{
+		for(int i = x; i < (x + w); ++ i)
+		{
+			const unsigned char* color = &image.data[(j * image.w + i) * 4];
+			int color_int = (color[0] << 24) | (color[1] << 16) | (color[2] << 8) | color[3];
+			ret.insert(color_int);
+		}
+	}
+
+	for(SetPal::iterator it = ret.begin(); it != ret.end(); ++it)
+	{
+		if(it != ret.begin() && ((0xFF & *it) != 0xFF)) //ret.begin() should be the only one transparent
+			printf("Warning: found more than one transparent color in tile at x:%d, y:%d of size w:%d, h:%d\n", x, y, w, h);
+	}
+
+	return ret;
+}
+
+unsigned int PaletteCountApplyMaxLimit(unsigned int max_palettes, unsigned int cur_palette_size)
+{
+	if (cur_palette_size > max_palettes)
+	{
+		printf("Warning: %d palettes found, truncating to %d (-max_palettes)\n", (unsigned int)cur_palette_size, (unsigned int)max_palettes);
+		return max_palettes;
+	}
+	else
+		return cur_palette_size;
+}
+
+bool GetSourceTileset(bool keep_palette_order, unsigned int max_palettes, vector< SetPal >& palettes) {
+
+	lodepng::State sourceTilesetState;
+	vector<unsigned char> buffer2;
+
+	lodepng::load_file(buffer2, source_tileset);
+
+
+	if (keep_palette_order) {
+		//Calling with keep_palette_order means
+			//-The image is png8
+			//-Each 4 colors define a gbc palette, the first color is the transparent one
+			//-Each rectangle with dimension(8, tile_h) in the image has colors from one of those palettes only
+		sourceTilesetState.info_raw.colortype = LCT_PALETTE;
+		sourceTilesetState.info_raw.bitdepth = 8;
+		sourceTilesetState.decoder.color_convert = false;
+
+			unsigned error = lodepng::decode(source_tileset_image.data, source_tileset_image.w, source_tileset_image.h, sourceTilesetState, buffer2);
+			if (error)
+			{
+				printf("decoder error %s\n", lodepng_error_text(error));
+				return false;
+			}
+
+
+		if (sourceTilesetState.info_raw.colortype != LCT_PALETTE)
+		{
+			printf("error: keep_palette_order only works with png8");
+			return false;
+		}
+
+		unsigned int palette_count = PaletteCountApplyMaxLimit(max_palettes, sourceTilesetState.info_raw.palettesize / pal_size);
+		source_tileset_image.palettesize = palette_count * pal_size;
+		source_tileset_image.palette = sourceTilesetState.info_raw.palette;
+	}
+	else {
+
+		PNGImage image32;
+		unsigned error = lodepng::decode(image32.data, image32.w, image32.h, sourceTilesetState, buffer2); //decode as 32 bit
+		if (error)
+		{
+			printf("decoder error %s\n", lodepng_error_text(error));
+			return false;
+		}
+
+
+		int* palettes_per_tile = new int[(image32.w / 8) * (image32.h / tile_h)];
+
+		for (unsigned int y = 0; y < image32.h; y += tile_h)
+		{
+			for (unsigned int x = 0; x < image32.w; x += 8)
+			{
+				//Get palette colors on (x, y, 8, tile_h)
+				SetPal pal = GetPaletteColors(image32, x, y, 8, tile_h);
+				if (pal.size() > pal_size)
+				{
+					printf("Error: more than %d colors found in tile at x:%d, y:%d of size w:%d, h:%d\n", (unsigned int)pal_size, x, y, 8, tile_h);
+					return false;
+				}
+
+				//Check if it matches any palettes or create a new one
+				size_t i;
+				for (i = 0; i < palettes.size(); ++i)
+				{
+					//Try to merge this palette with any of the palettes (checking if they are equal is not enough since the palettes can have less than 4 colors)
+					SetPal merged(palettes[i]);
+					merged.insert(pal.begin(), pal.end());
+					if (merged.size() <= pal_size)
+					{
+						if (palettes[i].size() <= pal_size)
+							palettes[i] = merged; //Increase colors with this palette (it has less than 4 colors)
+						break; //Found palette
+					}
+				}
+
+				if (i == palettes.size())
+				{
+					//Palette not found, add a new one
+					palettes.push_back(pal);
+				}
+
+				palettes_per_tile[(y / tile_h) * (image32.w / 8) + (x / 8)] = i;
+			}
+		};
+
+		//Create the indexed image
+		source_tileset_image.data.clear();
+		source_tileset_image.w = image32.w;
+		source_tileset_image.h = image32.h;
+
+		unsigned int palette_count = PaletteCountApplyMaxLimit(max_palettes, palettes.size());
+
+		source_tileset_image.palettesize = palette_count * pal_size;
+		source_tileset_image.palette = new unsigned char[palette_count * pal_size * 4]; //pal_size colors * 4 bytes each
+		source_palette_count = source_tileset_image.palettesize;
+
+		for (size_t p = 0; p < palette_count; ++p)
+		{
+			int* color_ptr = (int*)&source_tileset_image.palette[p * pal_size * 4];
+
+			//TODO: if palettes[p].size() != pal_size we should probably try to fill the gaps based on grayscale values
+
+			for (SetPal::iterator it = palettes[p].begin(); it != palettes[p].end(); ++it, color_ptr++)
+			{
+				unsigned char* c = (unsigned char*)&(*it);
+				*color_ptr = (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
+			}
+		}
+
+		for (size_t y = 0; y < image32.h; ++y)
+		{
+			for (size_t x = 0; x < image32.w; ++x)
+			{
+				unsigned char* c32ptr = &image32.data[(image32.w * y + x) * 4];
+				int color32 = (c32ptr[0] << 24) | (c32ptr[1] << 16) | (c32ptr[2] << 8) | c32ptr[3];
+				unsigned char palette = palettes_per_tile[(y / tile_h) * (image32.w / 8) + (x / 8)];
+				unsigned char index = std::distance(palettes[palette].begin(), palettes[palette].find(color32));
+				source_tileset_image.data.push_back((palette << bpp) + index);
+			}
+		}
+	}
+
+	// We'll change the image variable
+	// So we don't have to change any of the existing code
+	PNGImage temp = image;
+	image = source_tileset_image;
+	use_source_tileset = false;
+	GetMap();
+
+	// Our source tileset shouldn't build the map arrays up
+	// Clear anything from the previous 'GetMap' call
+	map.clear();
+	map_attributes.clear();
+	use_source_tileset = true;
+
+	// Change the image variable back
+	image = temp;
+
+	source_tileset_size = tiles.size();
+
+	printf("Got %d tiles from the source tileset.\n", (unsigned int)tiles.size());
+	printf("Got %d palettes from the source tileset.\n", (unsigned int)source_tileset_image.palettesize/4);
+
+	return true;
+
+}
+
+
+void Export(const PNGImage& image, const char* path)
+{
+	lodepng::State state;
+	state.info_png.color.colortype = LCT_PALETTE;
+	state.info_png.color.bitdepth = 8;
+	state.info_raw.colortype = LCT_PALETTE;
+	state.info_raw.bitdepth = 8;
+	state.encoder.auto_convert = 0; //we specify ourselves exactly what output PNG color mode we want
+
+#define ADD_PALETTE(R, G, B, A) lodepng_palette_add(&state.info_png.color, R, G, B, A); lodepng_palette_add(&state.info_raw, R, G, B, A)
+	for(size_t p = 0; p < image.palettesize; ++ p)
+	{
+		unsigned char* c = &image.palette[p * 4];
+		ADD_PALETTE(c[0], c[1], c[2], c[3]);
+	}
+
+	std::vector<unsigned char> buffer;
+	lodepng::encode(buffer, image.data, image.w, image.h, state);
+	lodepng::save_file(buffer, path);
+}
+
+int main(int argc, char* argv[])
+{
+	if (argc < 2)
+	{
+		printf("usage: png2asset    <file>.png [options]\n");
+		printf("-c                  ouput file (default: <png file>.c)\n");
+		printf("-sw <width>         metasprites width size (default: png width)\n");
+		printf("-sh <height>        metasprites height size (default: png height)\n");
+		printf("-sp <props>         change default for sprite OAM property bytes (in hex) (default: 0x00)\n");
+		printf("-px <x coord>       metasprites pivot x coordinate (default: metasprites width / 2)\n");
+		printf("-py <y coord>       metasprites pivot y coordinate (default: metasprites height / 2)\n");
+		printf("-pw <width>         metasprites collision rect widht (default: metasprites width)\n");
+		printf("-ph <height>        metasprites collision rect height (default: metasprites height)\n");
+		printf("-spr8x8             use SPRITES_8x8 (default: SPRITES_8x16)\n");
+		printf("-spr8x16            use SPRITES_8x16 (default: SPRITES_8x16)\n");
+		printf("-b <bank>           bank (default 0)\n");
+		printf("-keep_palette_order use png palette\n");
+		printf("-noflip             disable tile flip\n");
+		printf("-map                Export as map (tileset + bg)\n");
+		printf("-use_map_attributes Use CGB BG Map attributes (default: palettes are stored for each tile in a separate array)\n");
+		printf("-use_structs        Group the exported info into structs (default: false) (used by ZGB Game Engine)\n");
+		printf("-bpp                bits per pixel: 2, 4 (default: 2)\n");
+		printf("-max_palettes       max number of palettes allowed (default: 8)\n");
+		printf("                    (note: max colors = max_palettes x num colors per palette)\n");
+		printf("-pack_mode          gb, sgb or sms (default: gb)\n");
+		printf("-tile_origin        tile index offset for maps (default: 0)\n");
+
+		printf("-tiles_only         export tile data only\n");
+		printf("-maps_only          export map tilemap only\n");
+		printf("-metasprites_only   export metasprite descriptors only\n");
+		printf("-source_tileset     use source tileset (image with common tiles)\n");
+		printf("-keep_duplicate_tiles   do not remove duplicate tiles (default: not enabled)\n");
+
+		printf("-bin                export to binary format\n");
+		printf("-transposed         export transposed (column-by-column instead of row-by-row)\n");
+		return 0;
+	}
+
+	//default params
+	int sprite_w = 0;
+	int sprite_h = 0;
+	int pivot_x = 0xFFFFFF;
+	int pivot_y = 0xFFFFFF;
+	int pivot_w = 0xFFFFFF;
+	int pivot_h = 0xFFFFFF;
+	tile_h = 16;
+	string output_filename = argv[1];
+	output_filename = output_filename.substr(0, output_filename.size() - 4) + ".c";
+	int bank = 0;
+	bool keep_palette_order = false;
+	bool output_binary = false;
+	bool output_transposed = false;
+	size_t max_palettes = 8;
+
+	//Parse argv
+	for(int i = 2; i < argc; ++i)
+	{
+		if(!strcmp(argv[i], "-sw"))
+		{
+			sprite_w = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-sh"))
+		{
+			sprite_h = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-sp"))
+		{
+			props_default = strtol(argv[++i], NULL, 16);
+		}
+		if(!strcmp(argv[i], "-px"))
+		{
+			pivot_x = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-py"))
+		{
+			pivot_y = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-pw"))
+		{
+			pivot_w = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-ph"))
+		{
+			pivot_h = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-spr8x8"))
+		{
+			tile_h = 8;
+		}
+		else if(!strcmp(argv[i],"-spr8x16"))
+		{
+			tile_h = 16;
+		}
+		else if(!strcmp(argv[i], "-c"))
+		{
+			output_filename = argv[++ i];
+		}
+		else if(!strcmp(argv[i], "-b"))
+		{
+			bank = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-keep_palette_order"))
+		{
+			keep_palette_order = true;
+		}
+		else if(!strcmp(argv[i], "-noflip"))
+		{
+			flip_tiles = false;
+		}
+		else if(!strcmp(argv[i], "-map"))
+		{
+			export_as_map = true;
+		}
+		else if(!strcmp(argv[i], "-use_map_attributes"))
+		{
+			use_map_attributes = true;
+		}
+		else if(!strcmp(argv[i], "-use_structs"))
+		{
+			use_structs = true;
+		}
+		else if(!strcmp(argv[i], "-bpp"))
+		{
+			bpp = atoi(argv[++ i]);
+		}
+		else if(!strcmp(argv[i], "-max_palettes"))
+		{
+			max_palettes = atoi(argv[++ i]);
+			if (max_palettes == 0)
+			{
+				printf("-max_palettes must be larger than zero\n");
+				return 1;
+			}
+		}
+		else if(!strcmp(argv[i], "-pack_mode"))
+		{
+			std::string pack_mode_str = argv[++ i];
+			if     (pack_mode_str == "gb")  pack_mode = Tile::GB;
+			else if(pack_mode_str == "sgb") pack_mode = Tile::SGB;
+			else if(pack_mode_str == "sms") pack_mode = Tile::SMS;
+			else
+			{
+				printf("-pack_mode must be one of gb, sgb or sms\n");
+				return 1;
+			}
+		}
+		else if(!strcmp(argv[i], "-tile_origin"))
+		{
+			tile_origin = atoi(argv[++ i]);
+		}
+		else if (!strcmp(argv[i], "-maps_only") || !strcmp(argv[i], "-metasprites_only"))
+		{
+			includeTileData = false;
+		}
+		else if (!strcmp(argv[i], "-tiles_only"))
+		{
+			includedMapOrMetaspriteData = false;
+		}
+		else if (!strcmp(argv[i], "-keep_duplicate_tiles"))
+		{
+			keep_duplicate_tiles = true;
+		}
+		else if (!strcmp(argv[i], "-source_tileset"))
+		{
+			use_source_tileset = true;
+			includeTileData = false;
+			source_tileset = argv[++i];
+		}
+		else if (!strcmp(argv[i], "-bin"))
+		{
+			output_binary = true;
+		}
+		else if (!strcmp(argv[i], "-transposed"))
+		{
+			output_transposed = true;
+		}
+	}
+
+	pal_size = 1 << bpp;
+
+	if(export_as_map)
+		tile_h = 8; //Force tiles_h to 8 on maps
+
+	int slash_pos = (int)output_filename.find_last_of('/');
+	if(slash_pos == -1)
+		slash_pos = (int)output_filename.find_last_of('\\');
+	int dot_pos = (int)output_filename.find_first_of('.', slash_pos == -1 ? 0 : slash_pos);
+
+	string output_filename_h = output_filename.substr(0, dot_pos) + ".h";
+	string output_filename_bin = output_filename.substr(0, dot_pos) + "_map.bin";
+	string output_filename_attributes_bin = output_filename.substr(0, dot_pos) + "_map_attributes.bin";
+	string output_filename_tiles_bin = output_filename.substr(0, dot_pos) + "_tiles.bin";
+	string data_name = output_filename.substr(slash_pos + 1, dot_pos - 1 - slash_pos);
+	replace(data_name.begin(), data_name.end(), '-', '_');
+
+	// This was moved from outside the upcoming else statement when not using keep_palette_order
+	// So the 'GetSourceTileset' function can pre-populate it from the source tileset
+	vector< SetPal > palettes;
+
+	if (use_source_tileset) {
+
+		if (!GetSourceTileset(keep_palette_order, max_palettes, palettes)) {
+			return 1;
+		}
+	}
+
+
+	//load and decode png
+	vector<unsigned char> buffer;
+	lodepng::load_file(buffer, argv[1]);
+	lodepng::State state;
+	if(keep_palette_order)
+	{
+		//Calling with keep_palette_order means
+		//-The image is png8
+		//-For CGB: Each 4 colors define a gbc palette, the first color is the transparent one
+		//-Each rectangle with dimension(8, tile_h) in the image has colors from one of those palettes only
+		state.info_raw.colortype = LCT_PALETTE;
+		state.info_raw.bitdepth = 8;
+		state.decoder.color_convert = false;
+		unsigned error = lodepng::decode(image.data, image.w, image.h, state, buffer);
+		if(error)
+		{
+			printf("decoder error %s\n", lodepng_error_text(error));
+			return 1;
+		}
+
+		if(state.info_raw.colortype != LCT_PALETTE)
+		{
+			printf("error: keep_palette_order only works with png8");
+			return 1;
+		}
+
+		unsigned int palette_count = PaletteCountApplyMaxLimit(max_palettes, state.info_raw.palettesize / pal_size);
+		image.palettesize = palette_count * pal_size;
+		image.palette = state.info_raw.palette;
+
+		if (use_source_tileset) {
+
+			// Make sure these two values match when keeping palette order
+			if (image.palettesize != source_tileset_image.palettesize) {
+
+				printf("error: The number of color palette's for your source tileset (%d) and target image (%d) do not match.", (unsigned int)source_tileset_image.palettesize, (unsigned int)image.palettesize);
+				return 1;
+			}
+
+			size_t size = max(image.palettesize, source_tileset_image.palettesize);
+
+			// Make sure these two values match when keeping palette order
+			if (memcmp(image.palette, source_tileset_image.palette, size) != 0) {
+
+				printf("error: The palette's for your source tileset and target image do not match.");
+				return 1;
+			}
+		}
+	}
+	else
+	{
+		PNGImage image32;
+		unsigned error = lodepng::decode(image32.data, image32.w, image32.h, state, buffer); //decode as 32 bit
+		if(error)
+		{
+			printf("decoder error %s\n", lodepng_error_text(error));
+			return 1;
+		}
+
+		// Validate image dimensions
+		if( ((image32.w % TILE_W) != 0) || ((image32.h % tile_h) != 0) )
+		{
+			printf("Error: Image size %d x %d isn't an even multiple of tile size %d x %d\n", image32.w, image32.h, TILE_W, tile_h);
+			return 1;
+		}
+
+		int* palettes_per_tile = new int[(image32.w / 8) * (image32.h /tile_h)];
+		for(unsigned int y = 0; y < image32.h; y += tile_h)
+		{
+			for(unsigned int x = 0; x < image32.w; x += 8)
+			{
+				//Get palette colors on (x, y, 8, tile_h)
+				SetPal pal = GetPaletteColors(image32, x, y, 8, tile_h);
+				if(pal.size() > pal_size)
+				{
+					printf("Error: more than %d colors found in tile at x:%d, y:%d of size w:%d, h:%d\n", (unsigned int)pal_size, x, y, 8, tile_h);
+					return 1;
+				}
+
+				//Check if it matches any palettes or create a new one
+				size_t i;
+				for(i = 0; i < palettes.size(); ++i)
+				{
+					//Try to merge this palette wit any of the palettes (checking if they are equal is not enough since the palettes can have less than 4 colors)
+					SetPal merged(palettes[i]);
+					merged.insert(pal.begin(), pal.end());
+					if(merged.size() <= pal_size)
+					{
+						if(palettes[i].size() <= pal_size)
+							palettes[i] = merged; //Increase colors with this palette (it has less than 4 colors)
+						break; //Found palette
+					}
+				}
+
+				if(i == palettes.size())
+				{
+					//Palette not found, add a new one
+					palettes.push_back(pal);
+				}
+
+				palettes_per_tile[(y / tile_h) * (image32.w / 8) + (x / 8)] = i;
+			}
+		}
+
+		//Create the indexed image
+		image.data.clear();
+		image.w = image32.w;
+		image.h = image32.h;
+
+		unsigned int palette_count = PaletteCountApplyMaxLimit(max_palettes, palettes.size());
+
+		image.palettesize = palette_count * pal_size;
+		image.palette = new unsigned char[palette_count * pal_size * 4]; //pal_size colors * 4 bytes each
+
+		// If we are using a sourcetileset and have more palettes than it defines
+		if (use_source_tileset && image.palettesize > source_palette_count) {
+			printf("Found %d extra palette(s) for target tilemap.\n", (unsigned int)(image.palettesize - source_palette_count) / 4);
+		}
+		for(size_t p = 0; p < palette_count; ++p)
+		{
+			int *color_ptr = (int*)&image.palette[p * pal_size * 4];
+
+			//TODO: if palettes[p].size() != pal_size we should probably try to fill the gaps based on grayscale values
+
+			for(SetPal::iterator it = palettes[p].begin(); it != palettes[p].end(); ++ it, color_ptr ++)
+			{
+				unsigned char* c = (unsigned char*)&(*it);
+				*color_ptr = (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
+			}
+		}
+
+		for(size_t y = 0; y < image32.h; ++ y)
+		{
+			for(size_t x = 0; x < image32.w; ++x)
+			{
+				unsigned char* c32ptr = &image32.data[(image32.w * y + x) * 4];
+				int color32 = (c32ptr[0] << 24) | (c32ptr[1] << 16) | (c32ptr[2] << 8) | c32ptr[3];
+				unsigned char palette = palettes_per_tile[(y / tile_h) * (image32.w / 8) + (x / 8)];
+				unsigned char index = std::distance(palettes[palette].begin(), palettes[palette].find(color32));
+				image.data.push_back((palette << bpp) + index);
+			}
+		}
+
+		//Test: output png to see how it looks
+		//Export(image, "temp.png");
+	}
+
+	if(sprite_w == 0) sprite_w = (int)image.w;
+	if(sprite_h == 0) sprite_h = (int)image.h;
+	if(pivot_x == 0xFFFFFF) pivot_x = sprite_w / 2;
+	if(pivot_y == 0xFFFFFF) pivot_y = sprite_h / 2;
+	if(pivot_w == 0xFFFFFF) pivot_w = sprite_w;
+	if(pivot_h == 0xFFFFFF) pivot_h = sprite_h;
+
+	if(export_as_map)
+	{
+		//Extract map
+		GetMap();
+	}
+	else
+	{
+		//Extract metasprites
+		for(int y = 0; y < (int)image.h; y += sprite_h)
+		{
+			for(int x = 0; x < (int)image.w; x += sprite_w)
+			{
+				GetMetaSprite(x, y, sprite_w, sprite_h, pivot_x, pivot_y);
+			}
+		}
+	}
+
+	//Output .h FILE
+	FILE* file;
+	if(!output_binary||!export_as_map){
+		file=fopen(output_filename_h.c_str(), "w");
+		if (!file) {
+			printf("Error writing file");
+			return 1;
+		}
+
+		fprintf(file, "//AUTOGENERATED FILE FROM png2asset\n");
+		fprintf(file, "#ifndef METASPRITE_%s_H\n", data_name.c_str());
+		fprintf(file, "#define METASPRITE_%s_H\n", data_name.c_str());
+		fprintf(file, "\n");
+		fprintf(file, "#include <stdint.h>\n");
+		fprintf(file, "#include <gbdk/platform.h>\n");
+		fprintf(file, "#include <gbdk/metasprites.h>\n");
+		fprintf(file, "\n");
+		if(use_structs)
+		{
+			if(export_as_map)
+			{
+				fprintf(file, "#include \"TilesInfo.h\"\n");
+				fprintf(file, "#include \"MapInfo.h\"\n");
+				fprintf(file, "\n");
+				fprintf(file, "extern const struct TilesInfo %s_tiles_info;\n", data_name.c_str());
+				fprintf(file, "extern const struct MapInfo %s;\n", data_name.c_str());
+			}
+			else
+			{
+				fprintf(file, "#include \"MetaSpriteInfo.h\"\n");
+				fprintf(file, "\n");
+				fprintf(file, "extern const struct MetaSpriteInfo %s;\n", data_name.c_str());
+			}
+		}
+		else
+		{
+			fprintf(file, "#define %s_TILE_ORIGIN %d\n", data_name.c_str(), tile_origin);
+			fprintf(file, "#define %s_TILE_H %d\n", data_name.c_str(), tile_h);
+			fprintf(file, "#define %s_WIDTH %d\n",  data_name.c_str(), sprite_w);
+			fprintf(file, "#define %s_HEIGHT %d\n", data_name.c_str(), sprite_h);
+			fprintf(file, "#define %s_TILE_COUNT %d\n", data_name.c_str(), ((unsigned int)tiles.size() - source_tileset_size) * (tile_h >> 3));
+			fprintf(file, "#define %s_PALETTE_COUNT %d\n", data_name.c_str(), (unsigned int)image.palettesize / 4);
+
+			if (includedMapOrMetaspriteData) {
+
+				if(export_as_map)
+				{
+					fprintf(file, "#define %s_MAP_ATTRIBUTES ",  data_name.c_str());
+					if(use_map_attributes && map_attributes.size())
+						fprintf(file, "%s_map_attributes\n", data_name.c_str());
+					else
+						fprintf(file, "0\n");
+
+					fprintf(file, "#define %s_TILE_PALS ",  data_name.c_str());
+					if(use_map_attributes)
+						fprintf(file, "0\n");
+					else
+						fprintf(file, "%s_tile_pals\n", data_name.c_str());
+				}
+				else
+				{
+					fprintf(file, "#define %s_PIVOT_X %d\n", data_name.c_str(), pivot_x);
+					fprintf(file, "#define %s_PIVOT_Y %d\n", data_name.c_str(), pivot_y);
+					fprintf(file, "#define %s_PIVOT_W %d\n", data_name.c_str(), pivot_w);
+					fprintf(file, "#define %s_PIVOT_H %d\n", data_name.c_str(), pivot_h);
+				}
+			}
+			fprintf(file, "\n");
+			fprintf(file, "BANKREF_EXTERN(%s)\n", data_name.c_str());
+			fprintf(file, "\n");
+
+			// If we are not using a source tileset, or if we have extra palettes defined
+			if (image.palettesize - source_palette_count > 0 || !use_source_tileset) {
+				fprintf(file, "extern const palette_color_t %s_palettes[%d];\n", data_name.c_str(), (unsigned int)image.palettesize - source_palette_count);
+			}
+			if (includeTileData) {
+				fprintf(file, "extern const uint8_t %s_tiles[%d];\n", data_name.c_str(), (unsigned int)((tiles.size() - source_tileset_size) * (8 * tile_h * bpp / 8)));
+			}
+
+			fprintf(file, "\n");
+			if (includedMapOrMetaspriteData) {
+				if(export_as_map)
+				{
+					fprintf(file, "extern const unsigned char %s_map[%d];\n", data_name.c_str(), (unsigned int)map.size());
+
+					if(use_map_attributes) {
+						if(map_attributes.size()) {
+							fprintf(file, "extern const unsigned char %s_map_attributes[%d];\n", data_name.c_str(), (unsigned int)map_attributes.size());
+						}
+					}
+					else if (includeTileData)
+						fprintf(file, "extern const unsigned char* %s_tile_pals[%d];\n", data_name.c_str(), (unsigned int)tiles.size());
+				}
+				else
+				{
+					fprintf(file, "extern const metasprite_t* const %s_metasprites[%d];\n", data_name.c_str(), (unsigned int)sprites.size());
+				}
+			}
+		}
+		fprintf(file, "\n");
+		fprintf(file, "#endif");
+
+
+		fclose(file);
+
+		//Output .c FILE
+		file = fopen(output_filename.c_str(), "w");
+		if(!file) {
+			printf("Error writing file");
+			return 1;
+		}
+
+		if (bank) fprintf(file, "#pragma bank %d\n\n", bank);
+
+		fprintf(file, "//AUTOGENERATED FILE FROM png2asset\n\n");
+
+		fprintf(file, "#include <stdint.h>\n");
+		fprintf(file, "#include <gbdk/platform.h>\n");
+		fprintf(file, "#include <gbdk/metasprites.h>\n");
+		fprintf(file, "\n");
+
+		fprintf(file, "BANKREF(%s)\n\n", data_name.c_str());
+
+		// Are we not using a source tileset, or do we have extra colors
+		if (image.palettesize - source_palette_count > 0||!use_source_tileset) {
+
+				// Subtract however many palettes we had in the source tileset
+				fprintf(file, "const palette_color_t %s_palettes[%d] = {\n", data_name.c_str(), (unsigned int)image.palettesize - source_palette_count);
+
+				// Offset by however many palettes we had in the source ileset
+				for (size_t i = source_palette_count/4; i < image.palettesize / 4; ++i)
+				{
+					if(i != 0)
+						fprintf(file, ",\n");
+					fprintf(file, "\t");
+
+					unsigned char* pal_ptr = &image.palette[i * 16];
+					for(int c = 0; c < 4; ++ c, pal_ptr += 4)
+					{
+						fprintf(file, "RGB8(%d, %d, %d)", pal_ptr[0], pal_ptr[1], pal_ptr[2]);
+						if(c != 3)
+							fprintf(file, ", ");
+					}
+				}
+				fprintf(file, "\n};\n");
+		}
+
+		if (includeTileData) {
+			fprintf(file, "\n");
+			fprintf(file, "const uint8_t %s_tiles[%d] = {\n", data_name.c_str(), (unsigned int)((tiles.size()-source_tileset_size) * 8 * tile_h * bpp / 8));
+			for (vector< Tile >::iterator it = tiles.begin()+ source_tileset_size; it != tiles.end(); ++it)
+			{
+				fprintf(file, "\t");
+
+				vector< unsigned char > packed_data = (*it).GetPackedData(pack_mode);
+				for(vector< unsigned char >::iterator it2 = packed_data.begin(); it2 != packed_data.end(); ++it2)
+				{
+					fprintf(file, "0x%02x", (*it2));
+					if((it + 1) != tiles.end() || (it2 + 1) != packed_data.end())
+						fprintf(file, ",");
+				}
+
+				if(it != tiles.end())
+					fprintf(file, "\n");
+			}
+			fprintf(file, "};\n\n");
+		}
+
+		if(includedMapOrMetaspriteData) {
+
+			if(!export_as_map)
+			{
+				for(vector< MetaSprite >::iterator it = sprites.begin(); it != sprites.end(); ++ it)
+				{
+					fprintf(file, "const metasprite_t %s_metasprite%d[] = {\n", data_name.c_str(), (int)(it - sprites.begin()));
+					fprintf(file, "\t");
+					for(MetaSprite::iterator it2 = (*it).begin(); it2 != (*it).end(); ++ it2)
+					{
+						fprintf(file, "METASPR_ITEM(%d, %d, %d, %d), ", (*it2).offset_y, (*it2).offset_x, (*it2).offset_idx, (*it2).props);
+					}
+					fprintf(file, "METASPR_TERM\n");
+					fprintf(file, "};\n\n");
+				}
+
+				fprintf(file, "const metasprite_t* const %s_metasprites[%d] = {\n\t", data_name.c_str(), (unsigned int)sprites.size());
+				for(vector< MetaSprite >::iterator it = sprites.begin(); it != sprites.end(); ++ it)
+				{
+					fprintf(file, "%s_metasprite%d", data_name.c_str(), (int)(it - sprites.begin()));
+					if(it + 1 != sprites.end())
+						fprintf(file, ", ");
+				}
+				fprintf(file, "\n};\n");
+
+				if(use_structs)
+				{
+					fprintf(file, "\n");
+					fprintf(file, "#include \"MetaSpriteInfo.h\"\n");
+					fprintf(file, "const struct MetaSpriteInfo %s = {\n", data_name.c_str());
+					fprintf(file, "\t%d, //width\n", pivot_w);
+					fprintf(file, "\t%d, //height\n", pivot_h);
+					fprintf(file, "\t%d, //num tiles\n", (unsigned int)tiles.size() * (tile_h >> 3));
+					fprintf(file, "\t%s_tiles, //tiles\n", data_name.c_str());
+					fprintf(file, "\t%d, //num palettes\n", (unsigned int)(image.palettesize / pal_size));
+					fprintf(file, "\t%s_palettes, //CGB palette\n", data_name.c_str());
+					fprintf(file, "\t%d, //num sprites\n", (unsigned int)sprites.size());
+					fprintf(file, "\t%s_metasprites, //metasprites\n", data_name.c_str());
+					fprintf(file, "};\n");
+				}
+			}
+			else
+			{
+				if (includeTileData) {
+					//Export tiles pals (if any)
+					if(!use_map_attributes)
+					{
+						fprintf(file, "\n");
+						fprintf(file, "const uint8_t %s_tile_pals[%d] = {\n\t", data_name.c_str(), (unsigned int)tiles.size()- source_tileset_size);
+						for(vector< Tile >::iterator it = tiles.begin()+ source_tileset_size; it != tiles.end(); ++ it)
+						{
+							if(it != tiles.begin())
+								fprintf(file, ", ");
+							fprintf(file, "%d", it->pal);
+						}
+						fprintf(file, "\n};\n");
+					}
+
+					if(use_structs)
+					{
+						//Export Tiles Info
+						fprintf(file, "\n");
+						fprintf(file, "#include \"TilesInfo.h\"\n");
+						fprintf(file, "BANKREF(%s_tiles_info)\n", data_name.c_str());
+						fprintf(file, "const struct TilesInfo %s_tiles_info = {\n", data_name.c_str());
+						fprintf(file, "\t%d, //num tiles\n", (unsigned int)tiles.size() * (tile_h >> 3));
+						fprintf(file, "\t%s_tiles, //tiles\n", data_name.c_str());
+						fprintf(file, "\t%d, //num palettes\n", (unsigned int)(image.palettesize / pal_size));
+						fprintf(file, "\t%s_palettes, //palettes\n", data_name.c_str());
+						if(!use_map_attributes)
+							fprintf(file, "\t%s_tile_pals, //tile palettes\n", data_name.c_str());
+						else
+							fprintf(file, "\t0 //tile palettes\n");
+						fprintf(file, "};\n");
+					}
+				}
+
+				//Export map
+				fprintf(file, "\n");
+				fprintf(file, "const unsigned char %s_map[%d] = {\n", data_name.c_str(), (unsigned int)map.size());
+				size_t line_size = map.size() / (image.h / 8);
+				if (output_transposed) {
+
+					for(size_t i = 0; i < line_size; ++i)
+					{
+						fprintf(file, "\t");
+						for (size_t j = 0; j < image.h / 8; ++j)
+						{
+							fprintf(file, "0x%02x,", map[j * line_size + i]);
+						}
+						fprintf(file, "\n");
+					}
+				}
+				else {
+
+					for (size_t j = 0; j < image.h / 8; ++j)
+					{
+						fprintf(file, "\t");
+						for (size_t i = 0; i < line_size; ++i)
+						{
+							fprintf(file, "0x%02x,", map[j * line_size + i]);
+						}
+						fprintf(file, "\n");
+					}
+				}
+				fprintf(file, "};\n");
+
+
+				//Export map attributes (if any)
+				if(use_map_attributes && map_attributes.size())
+				{
+					fprintf(file, "\n");
+					fprintf(file, "const unsigned char %s_map_attributes[%d] = {\n", data_name.c_str(), (unsigned int)map_attributes.size());
+					if (output_transposed) {
+						for (size_t i = 0; i < line_size; ++i)
+						{
+							fprintf(file, "\t");
+							for (size_t j = 0; j < image.h / 8; ++j)
+							{
+								fprintf(file, "0x%02x,", map_attributes[j * line_size + i]);
+							}
+							fprintf(file, "\n");
+						}
+					}
+					else {
+						for (size_t j = 0; j < image.h / 8; ++j)
+						{
+							fprintf(file, "\t");
+							for (size_t i = 0; i < line_size; ++i)
+							{
+								fprintf(file, "0x%02x,", map_attributes[j * line_size + i]);
+							}
+							fprintf(file, "\n");
+						}
+					}
+
+					fprintf(file, "};\n");
+				}
+
+				if(use_structs)
+				{
+					//Export Map Info
+					fprintf(file, "\n");
+					fprintf(file, "#include \"MapInfo.h\"\n");
+					fprintf(file, "BANKREF_EXTERN(%s_tiles_info)\n", data_name.c_str());
+					fprintf(file, "const struct MapInfo %s = {\n", data_name.c_str());
+					fprintf(file, "\t%s_map, //map\n", data_name.c_str());
+					fprintf(file, "\t%d, //with\n", image.w >> 3);
+					fprintf(file, "\t%d, //height\n", image.h >> 3);
+					if (use_map_attributes && map_attributes.size())
+						fprintf(file, "\t%s_map_attributes, //map attributes\n", data_name.c_str());
+					else
+						fprintf(file, "\t%s, //map attributes\n", "0");
+					fprintf(file, "\tBANK(%s_tiles_info), //tiles bank\n", data_name.c_str());
+					fprintf(file, "\t&%s_tiles_info, //tiles info\n", data_name.c_str());
+					fprintf(file, "};\n");
+				}
+			}
+		}
+
+		fclose(file);
+	}
+
+	// If we are exporting as a map, and binary output is desired
+	else if (export_as_map) {
+
+		std::ofstream mapBinaryFile, mapAttributesBinaryfile,tilesBinaryFile;
+		mapBinaryFile.open(output_filename_bin, std::ios_base::binary);
+		tilesBinaryFile.open(output_filename_tiles_bin, std::ios_base::binary);
+
+		for (vector< Tile >::iterator it = tiles.begin() + source_tileset_size; it != tiles.end(); ++it)
+		{
+
+			vector< unsigned char > packed_data = (*it).GetPackedData(pack_mode);
+			for (vector< unsigned char >::iterator it2 = packed_data.begin(); it2 != packed_data.end(); ++it2)
+			{
+
+				const char chars[] = { (const char)(*it2) };
+				tilesBinaryFile.write(chars, 1);
+			}
+
+		}
+
+
+		// Open our file for writing attributes if speciied
+		if (use_map_attributes)mapAttributesBinaryfile.open(output_filename_attributes_bin, std::ios_base::binary);
+
+		int columns = image.w >> 3;
+		int rows = image.h >> 3;
+
+		// If we want the values to be column-by-column
+		if (output_transposed) {
+
+			// Swap the column/row for loops
+			for (int column = 0; column < columns; column++) {
+				for (int row = 0; row < rows; ++row) {
+
+					int tile = column + row * columns;
+
+					const char mapChars[] = { (const char)map[tile] };
+
+					// Write map items column-by-column
+					mapBinaryFile.write(mapChars, 1);
+					if(use_map_attributes) {
+						const char mapAttributeChars[] = { (const char)map_attributes[tile] };
+						mapAttributesBinaryfile.write(mapAttributeChars, 1);
+					}
+				}
+			}
+		}
+		else {
+
+			// Write the arrays as-is, row-by-row
+			mapBinaryFile.write((const char*)(&map[0]), rows * columns);
+			if (use_map_attributes)mapAttributesBinaryfile.write((const char*)(&map_attributes[0]), rows * columns);
+		}
+
+		// Finalzie the files
+		mapBinaryFile.close();
+		tilesBinaryFile.close();
+		if (use_map_attributes)mapAttributesBinaryfile.close();
+
+	}
+}
diff --git a/gbdk/gbdk-support/png2asset/png2asset.sln b/gbdk/gbdk-support/png2asset/png2asset.sln
new file mode 100644
index 00000000..c10e3616
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/png2asset.sln
@@ -0,0 +1,28 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25123.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "png2asset", "png2asset.vcxproj", "{6BA57070-30F6-442A-9DDA-32876359CB99}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Debug|x64.ActiveCfg = Debug|x64
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Debug|x64.Build.0 = Debug|x64
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Debug|x86.ActiveCfg = Debug|Win32
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Debug|x86.Build.0 = Debug|Win32
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Release|x64.ActiveCfg = Release|x64
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Release|x64.Build.0 = Release|x64
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Release|x86.ActiveCfg = Release|Win32
+		{6BA57070-30F6-442A-9DDA-32876359CB99}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/gbdk/gbdk-support/png2asset/png2asset.vcxproj b/gbdk/gbdk-support/png2asset/png2asset.vcxproj
new file mode 100644
index 00000000..e7fbf6f2
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/png2asset.vcxproj
@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{6BA57070-30F6-442A-9DDA-32876359CB99}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>png2asset</RootNamespace>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_CRT_SECURE_NO_WARNINGS;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+    <PostBuildEvent>
+      <Command>copy $(TargetPath) $(ZGB_PATH)\..\env\gbdk\bin
+copy $(TargetPath) C:\Users\Zalo\Desktop\gb\gbdk-2020\build\gbdk\bin</Command>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;_CRT_SECURE_NO_WARNINGS;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+    <PostBuildEvent>
+      <Command>copy $(TargetPath) $(ZGB_PATH)\..\env\gbdk\bin</Command>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+    <PostBuildEvent>
+      <Command>copy $(TargetPath) $(ZGB_PATH)\..\env\gbdk\bin</Command>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="lodepng.cpp" />
+    <ClCompile Include="png2asset.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="lodepng.h" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/gbdk/gbdk-support/png2asset/png2asset.vcxproj.filters b/gbdk/gbdk-support/png2asset/png2asset.vcxproj.filters
new file mode 100644
index 00000000..3884e1af
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/png2asset.vcxproj.filters
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="png2asset.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="lodepng.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="lodepng.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/gbdk/gbdk-support/png2asset/readme.md b/gbdk/gbdk-support/png2asset/readme.md
new file mode 100644
index 00000000..a1bb1f41
--- /dev/null
+++ b/gbdk/gbdk-support/png2asset/readme.md
@@ -0,0 +1,53 @@
+# png2asset
+A tool that converts png to maps or meta sprites in C for gbdk 2020
+
+### Working with png2asset
+  - The origin (pivot) for the metasprite is not required to be in the upper left-hand corner as with regular hardware sprites. See `-px` and `-py`.
+
+  - The conversion process supports using both SPRITES_8x8 (`-spr8x8`) and SPRITES_8x16 mode (`-spr8x16`). If 8x16 mode is used then the height of the metasprite must be a multiple of 16.
+
+#### Terminology
+The following abbreviations are used in this section:
+* Original Game Boy and Game Boy Pocket style hardware: `DMG`
+* Game Boy Color: `CGB`
+
+#### Conversion Process
+png2asset accepts any png as input, although that does not mean any image will be valid. The program will follow the next steps:
+  - The image will be subdivided into tiles of 8x8 or 8x16
+  - For each tile a palette will be generated
+  - If there are more than 4 colors in the palette it will throw an error
+  - The palette will be sorted from darkest to lightest. If there is a transparent color that will be the first one (this will create a palette that will also work with `DMG` devices)
+  - If there are more than 8 palettes the program will throw an error
+
+With all this, the program will generate a new indexed image (with palette), where each 4 colors define a palette and all colors within a tile can only have colors from one of these palettes
+
+It is also posible to pass an indexed 8-bit png with the palette properly sorted out, using `-keep_palette_order`
+  - Palettes will be extracted from the image palette in groups of 4 colors.
+  - Each tile can only have colors from one of these palettes per tile
+  - The maximum number of colors is 32
+
+Using this image a tileset will be created
+  - Duplicated tiles will be removed
+  - Tiles will be matched without mirror, using vertical mirror, horizontal mirror or both (use `-noflip` to turn off matching mirrored tiles)
+  - The palette won't be taken into account for matching, only the pixel color order, meaning there will be a match between tiles using different palettes but looking identical on grayscale
+
+#### Maps
+Passing `-map` the png can be converted to a map that can be used in both the background and the window. In this case, png2asset will generate:
+  - The palettes
+  - The tileset
+  - The map
+  - The color info
+    - By default, an array of palette index for each tile. This is not the way the hardware works but it takes less space and will create maps compatibles with both `DMG` and `CGB` devices.
+    - Passing `-use_map_attributes` will create an array of map attributes. It will also add mirroring info for each tile and because of that maps created with this won't be compatible with.
+      - Use `-noflip` to make background maps which are compatible with `DMG` devices.
+
+#### Meta sprites
+By default the png will be converted to metasprites. The image will be subdivided into meta sprites of `-sw` x `-sh`. In this case png2asset will generate:
+  - The metasprites, containing an array of:
+    - tile index
+    - y offset
+    - x offset
+    - flags, containing the mirror info, the palettes for both DMG and GBC and the sprite priority
+  - The metasprites array
+
+