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Code Issues Releases Activity

Correct Android failure to open an old CJK font

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* src/sfnt.c (sfnt_read_cmap_format_2): Properly compute
subtable count, and append the empty table at position 0.
(sfnt_lookup_glyph_2): Update commentary.
This commit is contained in:
Po Lu 2024-08-20 21:56:41 +08:00
parent 45ae4de0e7
commit 3419e7ea52
1 changed files with 12 additions and 7 deletions
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19
src/sfnt.c
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@ -383,15 +383,18 @@ sfnt_read_cmap_format_2 (int fd,
for (i = 0; i < 256; ++i)
{
/* Values in sub_header_keys are actually offsets from the end of
that array. Since the language of the spec is such as to imply
that they must be divisible by eight, divide them by the
same. */
sfnt_swap16 (&format2->sub_header_keys[i]);
if (format2->sub_header_keys[i] > nsub)
nsub = format2->sub_header_keys[i];
nsub = format2->sub_header_keys[i] / 8;
}
if (!nsub)
/* If there are no subheaders, then things are finished. */
return format2;
/* There always exists a subheader at index zero. */
nsub ++;
/* Otherwise, read the rest of the variable length data to the end
of format2. */
@ -1108,9 +1111,11 @@ sfnt_lookup_glyph_2 (sfnt_char character,
&& j <= ((int) subheader->first_code
+ (int) subheader->entry_count))
{
/* id_range_offset is actually the number of bytes past
itself containing the uint16_t ``slice''. It is possibly
unaligned. */
/* id_range_offset is actually the number of bytes past itself
containing the uint16_t ``slice''. Whether this may be
unaligned is not stated in the specification, but I doubt
it, for that would render values meaningless if the array
were byte swapped when read. */
slice = (unsigned char *) &subheader->id_range_offset;
slice += subheader->id_range_offset;
slice += (j - subheader->first_code) * sizeof (uint16_t);