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/* See LICENSE file for copyright and license details. */
#include "common.h"
static uint16_t
post_parse16(const char *data)
{
uint16_t b1 = (uint16_t)((const uint8_t *)data)[0];
uint16_t b2 = (uint16_t)((const uint8_t *)data)[1];
b1 = (uint16_t)(b1 << 8);
b2 = (uint16_t)(b2 << 0);
return (uint16_t)(b1 | b2);
}
static void
post_sign16(union {uint16_t u; int16_t s;} *info)
{
info->s = ((info->u >> 15) ? -(int16_t)(~info->u + 1) : (int16_t)info->u);
}
int
libparsesfnt_parse_post(
const char *data, size_t size,
struct libparsesfnt_post *infop,
const struct libparsesfnt_tabdir_entry *tag)
{
int ret;
ret = PARSE(LIBPARSESFNT_POST__, tag->offset, 0, 0, 0, 1, tag);
if (!ret) {
if (infop->format >> 16 == 2) {
if (2 > tag->length - tag->offset)
goto ebfont;
infop->subtable.v2.number_of_glyphs = post_parse16(&data[tag->offset + 2]);
}
}
return ret;
ebfont:
errno = EBFONT;
return -1;
}
static int
post_indices(
const char *data, size_t size,
uint16_t *indexp,
const struct libparsesfnt_tabdir_entry *tag,
size_t first, size_t count,
size_t offset)
{
if (offset > tag->length || first > (tag->length - offset) / 2)
goto ebfont;
offset += first * 2;
if (count > (tag->length - offset) / 2)
goto ebfont;
if (tag->offset > size || offset > size - tag->offset)
goto ebfont;
offset += tag->offset;
for (; count--; indexp++, offset += 2)
*indexp = post_parse16(&data[offset]);
return 0;
ebfont:
errno = EBFONT;
return -1;
}
int
libparsesfnt_parse_post_format_2_0_indices(
const char *data, size_t size,
uint16_t *indexp,
const struct libparsesfnt_tabdir_entry *tag,
size_t first, size_t count)
{
return post_indices(data, size, indexp, tag, first, count, 34);
}
int
libparsesfnt_parse_post_format_2_0_name(
const char *data, size_t size,
char namep[256],
const struct libparsesfnt_tabdir_entry *tag, const struct libparsesfnt_post *post,
size_t *offsetp /* start at 0 */)
{
size_t len;
if (!*offsetp) {
if ((size_t)post->subtable.v2.number_of_glyphs > ((size_t)tag->length - 34) / 2)
goto ebfont;
*offsetp = 34 + (size_t)post->subtable.v2.number_of_glyphs / 2;
if ((size_t)tag->length > size - (size_t)tag->offset)
goto ebfont;
}
if (*offsetp >= (size_t)tag->length)
goto ebfont;
len = (size_t)*(const uint8_t *)&data[*offsetp];
*offsetp += 1;
if (len > (size_t)tag->length - *offsetp)
goto ebfont;
memcpy(namep, &data[*offsetp], len);
namep[len] = 0;
*offsetp += len;
return 0;
ebfont:
errno = EBFONT;
return -1;
}
int
libparsesfnt_parse_post_format_2_5_offsets(
const char *data, size_t size,
int16_t *offsetp,
const struct libparsesfnt_tabdir_entry *tag,
size_t first, size_t count)
{
if (post_indices(data, size, (uint16_t *)offsetp, tag, first, count, 34))
return -1;
for (; count--; offsetp++)
post_sign16((void *)offsetp);
return 0;
}
int
libparsesfnt_parse_post_format_4_0_indices(
const char *data, size_t size,
uint16_t *indexp,
const struct libparsesfnt_tabdir_entry *tag,
size_t first, size_t count)
{
return post_indices(data, size, indexp, tag, first, count, 32);
}
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