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#include "stl.h"
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) > (b) ? (b) : (a))
enum {
STL_ASCII_SOLID,
STL_ASCII_SOLID_NAME,
STL_ASCII_ENDSOLID_CHECK,
STL_ASCII_FACET_NORMAL,
STL_ASCII_FACET_NORMAL_I,
STL_ASCII_FACET_NORMAL_J,
STL_ASCII_FACET_NORMAL_K,
STL_ASCII_OUTER_LOOP,
STL_ASCII_VERTEX_1,
STL_ASCII_VERTEX_1_X,
STL_ASCII_VERTEX_1_Y,
STL_ASCII_VERTEX_1_Z,
STL_ASCII_VERTEX_2,
STL_ASCII_VERTEX_2_X,
STL_ASCII_VERTEX_2_Y,
STL_ASCII_VERTEX_2_Z,
STL_ASCII_VERTEX_3,
STL_ASCII_VERTEX_3_X,
STL_ASCII_VERTEX_3_Y,
STL_ASCII_VERTEX_3_Z,
STL_ASCII_ENDLOOP,
STL_ASCII_ENDFACET,
STL_ASCII_ENDSOLID
};
enum {
STL_BIN_HEADER,
STL_BIN_TRIANGLE
};
static const uint8_t ascii_fsm[] = {
[STL_ASCII_SOLID] = STL_ASCII_SOLID_NAME,
[STL_ASCII_SOLID_NAME] = STL_ASCII_ENDSOLID_CHECK,
[STL_ASCII_ENDSOLID_CHECK] = STL_ASCII_FACET_NORMAL,
[STL_ASCII_FACET_NORMAL] = STL_ASCII_FACET_NORMAL_I,
[STL_ASCII_FACET_NORMAL_I] = STL_ASCII_FACET_NORMAL_K,
[STL_ASCII_FACET_NORMAL_K] = STL_ASCII_FACET_NORMAL_J,
[STL_ASCII_FACET_NORMAL_J] = STL_ASCII_OUTER_LOOP,
[STL_ASCII_OUTER_LOOP] = STL_ASCII_VERTEX_1,
[STL_ASCII_VERTEX_1] = STL_ASCII_VERTEX_1_X,
[STL_ASCII_VERTEX_1_X] = STL_ASCII_VERTEX_1_Y,
[STL_ASCII_VERTEX_1_Y] = STL_ASCII_VERTEX_1_Z,
[STL_ASCII_VERTEX_1_Z] = STL_ASCII_VERTEX_2,
[STL_ASCII_VERTEX_2] = STL_ASCII_VERTEX_2_X,
[STL_ASCII_VERTEX_2_X] = STL_ASCII_VERTEX_2_Y,
[STL_ASCII_VERTEX_2_Y] = STL_ASCII_VERTEX_2_Z,
[STL_ASCII_VERTEX_2_Z] = STL_ASCII_VERTEX_3,
[STL_ASCII_VERTEX_3] = STL_ASCII_VERTEX_3_X,
[STL_ASCII_VERTEX_3_X] = STL_ASCII_VERTEX_3_Y,
[STL_ASCII_VERTEX_3_Y] = STL_ASCII_VERTEX_3_Z,
[STL_ASCII_VERTEX_3_Z] = STL_ASCII_ENDLOOP,
[STL_ASCII_ENDLOOP] = STL_ASCII_ENDFACET,
[STL_ASCII_ENDFACET] = STL_ASCII_ENDSOLID_CHECK,
};
static void
stl_skip_spn(struct stl *stl, const char *spn)
{
const char *c;
size_t i;
c = stl->pos;
for (i = 0; i < stl->nleft; i++, c++) {
if (!strchr(spn, *c))
break;
}
stl->pos += i;
stl->nleft -= i;
}
static int
stl_read_n(struct stl *stl, size_t n)
{
size_t cnt;
if (stl->buflen >= n)
return STL_OK;
cnt = MIN(n - stl->buflen, stl->nleft);
memcpy(stl->buf + stl->buflen, stl->pos, cnt);
stl->buflen += cnt;
stl->pos += cnt;
stl->nleft -= cnt;
if (stl->buflen < n)
return STL_INCOMPLETE;
return STL_OK;
}
static int
stl_read_expect(struct stl *stl, const char *str, size_t n)
{
size_t i, cnt;
int rc;
rc = stl_read_n(stl, n);
if (rc) return rc;
if (strncmp(stl->buf, str, n))
return STL_INVALID;
stl->buflen = 0;
return STL_OK;
}
static int
stl_read_until(struct stl *stl, size_t *len, char *any, size_t max)
{
const char *c;
size_t i;
c = stl->pos;
for (i = 0; i < stl->nleft; i++, c++) {
if (strchr(any, *c)) {
*len = stl->buflen;
stl->buflen = 0;
return STL_OK;
}
if (stl->buflen >= max)
return STL_INVALID;
stl->buf[stl->buflen++] = *c;
stl->pos++;
stl->nleft--;
}
return STL_INCOMPLETE;
}
static int
stl_feed_binary(struct stl *stl, struct stl_result *res,
const void *chunk, size_t size)
{
int rc;
if (stl->bin.index == stl->bin.count)
return STL_DONE;
while (stl->nleft > 0) {
switch (stl->bin.state) {
case STL_BIN_HEADER:
rc = stl_read_n(stl, 84);
if (rc) return rc;
stl->bin.count = le32toh(*(uint32_t *)(stl->buf + 80));
stl->bin.state = STL_BIN_TRIANGLE;
res->type = STL_RES_HEADER;
res->header.str = stl->buf;
res->header.len = 80;
return STL_OK;
case STL_BIN_TRIANGLE:
rc = stl_read_n(stl, 50);
if (rc) return rc;
res->type = STL_RES_TRIANGLE;
res->tri.normal.x = le32toh(*(uint32_t *)(stl->buf + 0));
res->tri.normal.y = le32toh(*(uint32_t *)(stl->buf + 4));
res->tri.normal.z = le32toh(*(uint32_t *)(stl->buf + 8));
res->tri.vtx[0].x = le32toh(*(uint32_t *)(stl->buf + 12));
res->tri.vtx[0].y = le32toh(*(uint32_t *)(stl->buf + 16));
res->tri.vtx[0].z = le32toh(*(uint32_t *)(stl->buf + 20));
res->tri.vtx[1].x = le32toh(*(uint32_t *)(stl->buf + 24));
res->tri.vtx[1].y = le32toh(*(uint32_t *)(stl->buf + 28));
res->tri.vtx[1].z = le32toh(*(uint32_t *)(stl->buf + 32));
res->tri.vtx[2].x = le32toh(*(uint32_t *)(stl->buf + 36));
res->tri.vtx[2].y = le32toh(*(uint32_t *)(stl->buf + 40));
res->tri.vtx[2].z = le32toh(*(uint32_t *)(stl->buf + 40));
stl->bin.index++;
return STL_OK;
default:
return STL_INVALID_ARG;
}
}
return STL_INCOMPLETE;
}
static int
stl_feed_ascii(struct stl *stl, struct stl_result *res,
const void *chunk, size_t size)
{
char *end;
float val;
size_t len;
int rc;
while (stl->nleft > 0) {
switch (stl->ascii.state) {
case STL_ASCII_SOLID:
rc = stl_read_expect(stl, "solid ", 6);
if (rc) return rc;
break;
case STL_ASCII_SOLID_NAME:
rc = stl_read_until(stl, &len, "\n", STL_BUFMAX - 1);
if (rc) return rc;
stl->buf[len] = '\0';
res->type = STL_RES_SOLID_NAME;
res->solid_name.str = stl->buf;
res->solid_name.len = len;
stl->ascii.state = STL_ASCII_FACET_NORMAL;
return STL_OK;
case STL_ASCII_FACET_NORMAL:
if (!stl->buflen) stl_skip_spn(stl, " \t\v\n\r");
rc = stl_read_expect(stl, "facet normal ", 13);
if (rc) return rc;
break;
case STL_ASCII_OUTER_LOOP:
if (!stl->buflen) stl_skip_spn(stl, " \t\v\n\r");
rc = stl_read_expect(stl, "outer loop", 10);
if (rc) return rc;
break;
case STL_ASCII_FACET_NORMAL_I:
case STL_ASCII_FACET_NORMAL_J:
case STL_ASCII_FACET_NORMAL_K:
case STL_ASCII_VERTEX_1_X:
case STL_ASCII_VERTEX_1_Y:
case STL_ASCII_VERTEX_1_Z:
case STL_ASCII_VERTEX_2_X:
case STL_ASCII_VERTEX_2_Y:
case STL_ASCII_VERTEX_2_Z:
case STL_ASCII_VERTEX_3_X:
case STL_ASCII_VERTEX_3_Y:
case STL_ASCII_VERTEX_3_Z:
if (!stl->buflen) stl_skip_spn(stl, " \t");
rc = stl_read_until(stl, &len, " \n", STL_BUFMAX - 1);
if (rc) return rc;
stl->buf[len] = '\0';
val = strtof(stl->buf, &end);
if (end && *end) return STL_INVALID;
switch (stl->ascii.state) {
case STL_ASCII_FACET_NORMAL_I:
stl->tri.normal.x = val;
break;
case STL_ASCII_FACET_NORMAL_J:
stl->tri.normal.y = val;
break;
case STL_ASCII_FACET_NORMAL_K:
stl->tri.normal.z = val;
break;
case STL_ASCII_VERTEX_1_X:
stl->tri.vtx[0].x = val;
break;
case STL_ASCII_VERTEX_1_Y:
stl->tri.vtx[0].y = val;
break;
case STL_ASCII_VERTEX_1_Z:
stl->tri.vtx[0].z = val;
break;
case STL_ASCII_VERTEX_2_X:
stl->tri.vtx[1].x = val;
break;
case STL_ASCII_VERTEX_2_Y:
stl->tri.vtx[1].y = val;
break;
case STL_ASCII_VERTEX_2_Z:
stl->tri.vtx[1].z = val;
break;
case STL_ASCII_VERTEX_3_X:
stl->tri.vtx[2].x = val;
break;
case STL_ASCII_VERTEX_3_Y:
stl->tri.vtx[2].y = val;
break;
case STL_ASCII_VERTEX_3_Z:
stl->tri.vtx[2].z = val;
break;
}
break;
case STL_ASCII_VERTEX_1:
case STL_ASCII_VERTEX_2:
case STL_ASCII_VERTEX_3:
if (!stl->buflen) stl_skip_spn(stl, " \t\v\n\r");
rc = stl_read_expect(stl, "vertex", 6);
if (rc) return rc;
break;
case STL_ASCII_ENDLOOP:
if (!stl->buflen) stl_skip_spn(stl, " \t\v\n\r");
rc = stl_read_expect(stl, "endloop", 7);
if (rc) return rc;
break;
case STL_ASCII_ENDFACET:
if (!stl->buflen) stl_skip_spn(stl, " \t\v\n\r");
rc = stl_read_expect(stl, "endfacet", 8);
if (rc) return rc;
res->type = STL_RES_TRIANGLE;
res->tri = stl->tri;
stl->ascii.state = STL_ASCII_ENDSOLID_CHECK;
return STL_OK;
case STL_ASCII_ENDSOLID_CHECK:
if (!stl->buflen) stl_skip_spn(stl, " \t\v\n\r");
rc = stl_read_expect(stl, "endsolid", 8);
if (!rc) return STL_DONE;
break;
defualt:
return STL_INVALID_ARG;
};
stl->ascii.state = ascii_fsm[stl->ascii.state];
}
return STL_INCOMPLETE;
}
void
stl_init(struct stl *stl, int type)
{
stl->type = type;
stl->buflen = 0;
stl->chunk = NULL;
stl->pos = NULL;
stl->nleft = 0;
}
int
stl_feed(struct stl *stl, struct stl_result *res,
const void *chunk, size_t size)
{
size_t cnt;
int rc;
if (stl->chunk != chunk) {
if (stl->nleft > 0)
return STL_INVALID;
stl->chunk = chunk;
stl->pos = stl->chunk;
stl->nleft = size;
}
if (stl->type == STL_TYPE_DETECT) {
rc = stl_read_expect(stl, "solid ", 6);
if (rc == STL_INCOMPLETE)
return STL_INCOMPLETE;
if (rc == STL_OK) {
printf("ascii file\n");
stl->type = STL_TYPE_ASCII;
stl->ascii.state = STL_ASCII_SOLID_NAME;
} else {
printf("binary file\n");
stl->type = STL_TYPE_BINARY;
stl->bin.state = STL_BIN_HEADER;
stl->bin.index = 0;
stl->bin.count = SIZE_MAX;
}
res->type = STL_RES_FILETYPE;
res->filetype = stl->type;
return STL_OK;
}
switch (stl->type) {
case STL_TYPE_ASCII:
return stl_feed_ascii(stl, res, chunk, size);
case STL_TYPE_BINARY:
return stl_feed_binary(stl, res, chunk, size);
default:
return STL_INVALID_ARG;
}
}
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