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Check table is unicode for locate_xx_table #25

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Check table is unicode for locate_xx_table #25

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18 changes: 16 additions & 2 deletions ttf2mesh.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1411,6 +1411,16 @@ static int parse_fmt12(ttf_t *ttf, uint8_t *data, int dataSize, bool headers_onl
return TTF_DONE;
}

static int is_unicode_table(uint16_t platformID, uint16_t encodingID) {
// https://learn.microsoft.com/en-us/typography/opentype/spec/cmap#unicode-platform-platform-id--0
// UnicodePlatform
if (platformID == 0 && (encodingID == 3 || encodingID == 4)) return 1;
// https://learn.microsoft.com/en-us/typography/opentype/spec/cmap#windows-platform-platform-id--3
// WindowsPlatformUnicode
if (platformID == 3 && (encodingID == 1 || encodingID == 10)) return 1;
return 0;
}

static int locate_fmt4_table(pps_t *s)
{
int i;
Expand All @@ -1423,7 +1433,9 @@ static int locate_fmt4_table(pps_t *s)
int offset = big32toh(s->pcmap->encRecs[i].offset);
if (offset + 4 > s->scmap || offset + 4 < 0) return TTF_ERR_FMT;
uint16_t format = *(uint16_t *)((char *)s->pcmap + offset);
if (big16toh(format) != 4) continue;
uint16_t platformID = big16toh(s->pcmap->encRecs[i].platformID);
uint16_t encodingID = big16toh(s->pcmap->encRecs[i].encodingID);
if (big16toh(format) != 4 || !is_unicode_table(platformID, encodingID)) continue;
s->pfmt4 = (ttf_fmt4_t *)((char *)s->pcmap + offset);
s->sfmt4 = s->scmap - offset;
return TTF_DONE;
Expand All @@ -1443,7 +1455,9 @@ static int locate_fmt12_table(pps_t *s)
int offset = big32toh(s->pcmap->encRecs[i].offset);
if (offset + 4 > s->scmap || offset + 4 < 0) return TTF_ERR_FMT;
uint16_t format = *(uint16_t *)((char *)s->pcmap + offset);
if (big16toh(format) != 12) continue;
uint16_t platformID = big16toh(s->pcmap->encRecs[i].platformID);
uint16_t encodingID = big16toh(s->pcmap->encRecs[i].encodingID);
if (big16toh(format) != 12 || !is_unicode_table(platformID, encodingID)) continue;
s->pfmt12 = (ttf_fmt12_t *)((char *)s->pcmap + offset);
s->sfmt12 = s->scmap - offset;
return TTF_DONE;
Expand Down