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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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7
ANNOUNCE
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@ -1,4 +1,4 @@
Libpng 1.6.30beta04 - May 24, 2017 Libpng 1.6.30beta04 - June 6, 2017
This is not intended to be a public release. It will be replaced This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version. within a few weeks by a public version or by another test version.
@ -45,7 +45,10 @@ Version 1.6.30beta03 [May 22, 2017]
Test CMAKE_HOST_WIN32 instead of WIN32 in CMakeLists.txt. Test CMAKE_HOST_WIN32 instead of WIN32 in CMakeLists.txt.
Fix some URL in documentation. Fix some URL in documentation.
Version 1.6.30beta04 [May 24, 2017] Version 1.6.30beta04 [June 6, 2017]
Avoid writing an empty IDAT when the last IDAT exactly fills the
compression buffer (bug report by Brian Baird). This bug was
introduced in libpng-1.6.0.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

5
CHANGES
View File

@ -5840,7 +5840,10 @@ Version 1.6.30beta03 [May 22, 2017]
Test CMAKE_HOST_WIN32 instead of WIN32 in CMakeLists.txt. Test CMAKE_HOST_WIN32 instead of WIN32 in CMakeLists.txt.
Fix some URL in documentation. Fix some URL in documentation.
Version 1.6.30beta04 [May 24, 2017] Version 1.6.30beta04 [June 6, 2017]
Avoid writing an empty IDAT when the last IDAT exactly fills the
compression buffer (bug report by Brian Baird). This bug was
introduced in libpng-1.6.0.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

6
pngwutil.c
View File

@ -1003,7 +1003,8 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
optimize_cmf(data, png_image_size(png_ptr)); optimize_cmf(data, png_image_size(png_ptr));
#endif #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->mode |= PNG_HAVE_IDAT;
png_ptr->zstream.next_out = data; 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)); optimize_cmf(data, png_image_size(png_ptr));
#endif #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.avail_out = 0;
png_ptr->zstream.next_out = NULL; png_ptr->zstream.next_out = NULL;
png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;