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[libpng16] Implement eXIf chunk support

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This commit is contained in:
Glenn Randers-Pehrson
2017-07-13 11:19:53 -05:00
parent 40943eb67a
commit 68cb0aaee3
17 changed files with 216 additions and 5 deletions
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38
pngrutil.c
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@@ -2009,6 +2009,44 @@ png_handle_bKGD(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
}
#endif
#ifdef PNG_READ_eXIf_SUPPORTED
void /* PRIVATE */
png_handle_eXIf(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
unsigned int i;
png_bytep eXIf_buf;
png_debug(1, "in png_handle_eXIf");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_chunk_error(png_ptr, "missing IHDR");
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_eXIf) != 0)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "duplicate");
return;
}
eXIf_buf = png_voidcast(png_bytep,
png_malloc_warn(png_ptr, length));
for (i = 0; i < length; i++)
{
png_byte buf[1];
png_crc_read(png_ptr, buf, 1);
eXIf_buf[i] = buf[0];
}
if (png_crc_finish(png_ptr, 0) != 0)
return;
info_ptr->num_exif = length;
png_set_eXIf(png_ptr, info_ptr, eXIf_buf);
}
#endif
#ifdef PNG_READ_hIST_SUPPORTED
void /* PRIVATE */
png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)