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[libpng17] Port recent zlib windowBits handling from libpng-1.6.3beta06

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Glenn Randers-Pehrson
2013-05-10 17:37:42 -05:00
parent 0cc23ac171
commit bd56d76417
21 changed files with 1570 additions and 48 deletions
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@@ -285,6 +285,23 @@ Version 1.7.0beta13 [May 10, 2013]
Added a call to png_set_packing()
Initialize dimension values so if sscanf fails at least we have known
invalid values.
Calculate our own zlib windowBits when decoding rather than trusting the
CMF bytes in the PNG datastream.
Added an option to force maximum window size for inflating, which was
the behavior of libpng15 and earlier.
Added png-fix-itxt and png-fix-too-far-back to the built programs and
removed warnings from the source code and timepng that are revealed as
a result.
Detect wrong libpng versions linked to png-fix-too-far-back, which currently
only works with libpng versions that can be made to reliably fail when
the deflate data contains an out-of-window reference. This means only
1.6 and later.
Attempt to detect configuration issues with png-fix-too-far-back, which
requires both the correct libpng and the correct zlib to function
correctly.
Check ZLIB_VERNUM for mismatches, enclose #error in quotes
Added information in the documentation about problems with and fixes for
the bad CRC and bad iTXt chunk situations.
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