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[libpng16] Avoid writing an empty IDAT when the last IDAT exactly fills the

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compression buffer (bug report by Brian Baird).  This bug was introduced in
libpng-1.6.0.
This commit is contained in:
Glenn Randers-Pehrson
2017-06-06 18:40:45 -05:00
parent 11629b1c1a
commit c548328904
3 changed files with 13 additions and 5 deletions
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6
pngwutil.c
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@@ -1003,7 +1003,8 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
optimize_cmf(data, png_image_size(png_ptr));
#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
if (size)
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->zstream.next_out = data;
@@ -1049,7 +1050,8 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
optimize_cmf(data, png_image_size(png_ptr));
#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
if (size)
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
png_ptr->zstream.avail_out = 0;
png_ptr->zstream.next_out = NULL;
png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;