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#define _DEFAULT_SOURCE
#include "idx.h"
#include <endian.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
static const uint8_t idx_type_encode_lut[IDX_TYPE_COUNT] = {
[IDX_TYPE_UNSIGNED_BYTE] = 0x08,
[IDX_TYPE_SIGNED_BYTE] = 0x09,
[IDX_TYPE_SHORT] = 0x0B,
[IDX_TYPE_INT] = 0x0C,
[IDX_TYPE_FLOAT] = 0x0D,
[IDX_TYPE_DOUBLE] = 0x0E,
};
static const uint8_t idx_type_size[IDX_TYPE_COUNT] = {
[IDX_TYPE_UNSIGNED_BYTE] = 1,
[IDX_TYPE_SIGNED_BYTE] = 1,
[IDX_TYPE_SHORT] = 2,
[IDX_TYPE_INT] = 4,
[IDX_TYPE_FLOAT] = 4,
[IDX_TYPE_DOUBLE] = 8
};
static bool valid_idx_type(int type);
static int idx_type_decode(int val);
static bool fread_u32(FILE *f, uint32_t *val);
static bool fwrite_u32(FILE *f, uint32_t val);
bool
valid_idx_type(int type)
{
return type >= 0 && type < IDX_TYPE_COUNT;
}
int
idx_type_decode(int val)
{
int i;
for (i = 0; i < IDX_TYPE_COUNT; i++) {
if (val == idx_type_encode_lut[i])
return i;
}
return IDX_TYPE_UNKNOWN;
}
bool
fread_u32(FILE *f, uint32_t *val)
{
size_t len;
len = fread(val, 4, 1, f);
if (len != 1) return false;
*val = be32toh(*val);
return true;
}
bool
fwrite_u32(FILE *f, uint32_t val)
{
size_t len;
val = htobe32(val);
len = fwrite(&val, 4, 1, f);
if (len != 1) return false;
return true;
}
int
idx_new(struct idx *idx, uint8_t dims_count, uint32_t *dims, int data_type,
const struct allocator *allocator)
{
size_t i, size;
int rc;
if (!valid_idx_type(data_type))
return IDX_BAD_PARAM;
size = idx_type_size[data_type];
for (i = 0; i < dims_count; i++)
size *= dims[i];
idx->allocator = allocator;
idx->buf.data = allocator->alloc(allocator, size, &rc);
if (!idx->buf.data) return -rc;
idx->buf.len = size;
idx->dims.sizes = dims; /* move */
idx->dims.count = dims_count;
idx->type.size = idx_type_size[data_type];
idx->type.val = data_type;
return IDX_OK;
}
int
idx_wrap(struct idx *idx, void *data, uint8_t dims_count,
uint32_t *dims, int data_type)
{
size_t i, size;
if (!valid_idx_type(data_type))
return IDX_BAD_PARAM;
size = idx_type_size[data_type];
for (i = 0; i < dims_count; i++)
size *= dims[i];
idx->allocator = NULL;
idx->buf.data = data; /* move */
idx->buf.len = size;
idx->dims.sizes = dims; /* move */
idx->dims.count = dims_count;
idx->type.size = idx_type_size[data_type];
idx->type.val = data_type;
return IDX_OK;
}
int
idx_load(struct idx *idx, const char *filename,
const struct allocator *allocator)
{
uint32_t magic;
size_t len, i;
FILE *file;
int rc;
file = fopen(filename, "r");
if (file == NULL)
return IDX_FILE_ACCESS;
/* read magic */
if (!fread_u32(file, &magic))
return IDX_FILE_READ_MAGIC;
if ((magic & 0xFFFF0000) != 0)
return IDX_FILE_BAD_MAGIC;
idx->type.val = idx_type_decode((magic & 0xFF00) >> 8);
if (idx->type.val == IDX_TYPE_UNKNOWN)
return IDX_FILE_BAD_TYPE;
idx->type.size = idx_type_size[idx->type.val];
idx->dims.count = magic & 0xFF;
if (idx->dims.count == 0)
return IDX_FILE_BAD_DIMS;
idx->allocator = allocator;
idx->dims.sizes = allocator->alloc(allocator,
sizeof(uint32_t) * idx->dims.count, &rc);
if (!idx->dims.sizes) return -rc;
/* read dims */
idx->buf.len = 1;
for (i = 0; i < idx->dims.count; i++) {
if (!fread_u32(file, &idx->dims.sizes[i]))
return IDX_FILE_READ_DIMS;
idx->buf.len *= idx->dims.sizes[i];
}
idx->buf.data = allocator->alloc(allocator, idx->buf.len, &rc);
if (idx->buf.data) return -rc;
/* read data */
len = fread(idx->buf.data, idx->type.size, idx->buf.len, file);
if (len != idx->buf.len)
return IDX_FILE_READ_DATA;
fclose(file);
return IDX_OK;
}
int
idx_save(struct idx *idx, const char *filename)
{
FILE *file;
uint32_t val;
size_t i, len, size;
file = fopen(filename, "w+");
if (file == NULL)
return IDX_FILE_ACCESS;
if (!valid_idx_type(idx->type.val))
return IDX_BAD_PARAM;
val = idx_type_encode_lut[idx->type.val];
/* write magic */
if (!fwrite_u32(file, (val << 8) + idx->dims.count))
return IDX_FILE_WRITE_MAGIC;
/* write dims */
for (i = 0; i < idx->dims.count; i++) {
if (!fwrite_u32(file, idx->dims.sizes[i]))
return IDX_FILE_WRITE_DIMS;
}
size = idx_type_size[idx->type.val];
for (i = 0; i < idx->dims.count; i++)
size *= idx->dims.sizes[i];
/* write data */
len = fwrite(idx->buf.data, 1, size, file);
if (len != size) return IDX_FILE_WRITE_DATA;
fclose(file);
return IDX_OK;
}
int
idx_deinit(struct idx *idx)
{
int rc;
if (!idx->allocator) return IDX_OK;
rc = idx->allocator->free(idx->allocator, idx->buf.data);
if (rc) return -rc;
rc = idx->allocator->free(idx->allocator, idx->dims.sizes);
if (rc) return -rc;
return IDX_OK;
}
void *
idx_get(struct idx *idx, int dims, ...)
{
va_list ap;
size_t stride;
size_t i, val;
void *p;
if (dims < 0 || dims > idx->dims.count)
return NULL;
stride = 1;
for (i = 0; i < idx->dims.count; i++)
stride *= idx->dims.sizes[i];
p = idx->buf.data;
va_start(ap, dims);
for (i = 0; i < dims; i++) {
val = va_arg(ap, size_t);
if (val >= idx->dims.sizes[i])
return NULL;
stride /= idx->dims.sizes[i];
p += stride * val;
}
va_end(ap);
return p;
}
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