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/* tapost.c */
/*
* Copyright (C) 2011-2021 by Werner Lemberg.
*
* This file is part of the ttfautohint library, and may only be used,
* modified, and distributed under the terms given in `COPYING'. By
* continuing to use, modify, or distribute this file you indicate that you
* have read `COPYING' and understand and accept it fully.
*
* The file `COPYING' mentioned in the previous paragraph is distributed
* with the ttfautohint library.
*/
#include <string.h>
#include "ta.h"
FT_Error
TA_sfnt_update_post_table(SFNT* sfnt,
FONT* font)
{
SFNT_Table* post_table;
FT_Byte* buf;
FT_ULong buf_len;
FT_Byte* buf_new;
FT_ULong buf_new_len;
FT_ULong version;
if (sfnt->post_idx == MISSING)
return TA_Err_Ok;
post_table = &font->tables[sfnt->post_idx];
buf = post_table->buf;
buf_len = post_table->len;
if (post_table->processed)
return TA_Err_Ok;
version = (FT_ULong)(buf[0] << 24
| buf[1] << 16
| buf[2] << 8
| buf[3]);
/* since we have to add a non-standard glyph name, */
/* we must convert `name' tables in formats 1.0 and 2.5 into format 2.0 */
if (version == 0x10000)
{
/* XXX */
}
else if (version == 0x20000)
{
FT_UShort num_glyphs;
FT_UShort max_name_idx;
FT_ULong len;
FT_UShort i;
FT_Byte* p;
FT_Byte* p_new;
num_glyphs = (FT_UShort)(buf[32] << 8 | buf[33]);
p = buf + 34;
max_name_idx = 0;
/* get number of glyph names stored in `names' array */
for (i = 0; i < num_glyphs; i++)
{
FT_UShort idx;
idx = NEXT_USHORT(p);
if (idx >= 258)
{
idx -= 257;
if (idx > max_name_idx)
max_name_idx = idx;
}
}
/* we add one entry to the `glyphNameIndex' array, */
/* and append TTFAUTOHINT_GLYPH_LEN bytes to the `names' array */
buf_new_len = post_table->len + 2 + TTFAUTOHINT_GLYPH_LEN;
/* make the allocated buffer length a multiple of 4 */
len = (buf_new_len + 3) & ~3U;
buf_new = (FT_Byte*)malloc(len);
if (!buf_new)
return FT_Err_Out_Of_Memory;
/* pad end of buffer with zeros */
buf_new[len - 1] = 0x00;
buf_new[len - 2] = 0x00;
buf_new[len - 3] = 0x00;
/* copy the table and insert the new data */
p = buf;
p_new = buf_new;
memcpy(p_new, p, 32); /* header */
p += 32;
p_new += 32;
*p_new = HIGH(num_glyphs + 1);
*(p_new + 1) = LOW(num_glyphs + 1);
p += 2;
p_new += 2;
memcpy(p_new, p, num_glyphs * 2); /* glyphNameIndex */
p += num_glyphs * 2;
p_new += num_glyphs * 2;
*p_new = HIGH(max_name_idx + 1 + 257); /* new entry */
*(p_new + 1) = LOW(max_name_idx + 1 + 257);
p_new += 2;
memcpy(p_new, p, (size_t)(buf + buf_len - p)); /* names */
p_new += buf + buf_len - p;
strncpy((char*)p_new, TTFAUTOHINT_GLYPH_FIRST_BYTE TTFAUTOHINT_GLYPH,
TTFAUTOHINT_GLYPH_LEN); /* new entry */
free(buf);
post_table->buf = buf_new;
post_table->len = buf_new_len;
}
else if (version == 0x28000)
{
/* XXX */
}
else
goto Done; /* nothing to do for format 3.0 */
post_table->checksum = TA_table_compute_checksum(post_table->buf,
post_table->len);
Done:
post_table->processed = 1;
return TA_Err_Ok;
}
/* end of tapost.c */
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