| Libpng 1.6.21 - January 15, 2016 |
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| This is a public release of libpng, intended for use in production codes. |
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| Files available for download: |
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| Source files with LF line endings (for Unix/Linux) and with a |
| "configure" script |
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| libpng-1.6.21.tar.xz (LZMA-compressed, recommended) |
| libpng-1.6.21.tar.gz |
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| Source files with CRLF line endings (for Windows), without the |
| "configure" script |
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| /scratch/glennrp/Libpng16/lpng1621.7z (LZMA-compressed, recommended) |
| /scratch/glennrp/Libpng16/lpng1621.zip |
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| Other information: |
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| libpng-1.6.21-README.txt |
| libpng-1.6.21-LICENSE.txt |
| libpng-1.6.21-*.asc (armored detached GPG signatures) |
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| Changes since the last public release (1.6.20): |
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| Fixed syntax "$(command)" in tests/pngstest that some shells other than |
| bash could not parse (Bug report by Nelson Beebe). Use `command` instead. |
| Moved png_check_keyword() from pngwutil.c to pngset.c |
| Removed LE/BE dependencies in pngvalid, to 'fix' the current problem |
| in the BigEndian tests by not testing it, making the BE code the same |
| as the LE version. |
| Fixes to pngvalid for various reduced build configurations (eliminate unused |
| statics) and a fix for the case in rgb_to_gray when the digitize option |
| reduces graylo to 0, producing a large error. |
| Widened the 'limit' check on the internally calculated error limits in |
| the 'DIGITIZE' case (the code used prior to 1.7 for rgb_to_gray error |
| checks) and changed the check to only operate in non-release builds |
| (base build type not RC or RELEASE.) |
| Fixed undefined behavior in pngvalid.c, undefined because |
| (png_byte) << shift is undefined if it changes the signed bit |
| (because png_byte is promoted to int). The libpng exported functions |
| png_get_uint_32 and png_get_uint_16 handle this. (Bug reported by |
| David Drysdale as a result of reports from UBSAN in clang 3.8). |
| This changes pngvalid to use BE random numbers; this used to produce |
| errors but these should not be fixed as a result of the previous changes. |
| In projects/vstudio, combined readme.txt and WARNING into README.txt |
| Relocated assert() in contrib/tools/pngfix.c, bug found by American |
| Fuzzy Lop, reported by Brian Carpenter. |
| Marked 'limit' UNUSED in transform_range_check(). This only affects |
| release builds. |
| Worked around a false-positive Coverity issue in pngvalid.c. |
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| Send comments/corrections/commendations to png-mng-implement at lists.sf.net |
| (subscription required; visit |
| https://lists.sourceforge.net/lists/listinfo/png-mng-implement |
| to subscribe) |
| or to glennrp at users.sourceforge.net |
| |
| Glenn R-P |