57 lines
2.3 KiB
Plaintext
57 lines
2.3 KiB
Plaintext
Libpng 1.6.24beta02 - June 20, 2016
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This is not intended to be a public release. It will be replaced
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within a few weeks by a public version or by another test version.
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Files available for download:
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Source files with LF line endings (for Unix/Linux) and with a
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"configure" script
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1.6.24beta02.tar.xz (LZMA-compressed, recommended)
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1.6.24beta02.tar.gz
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Source files with CRLF line endings (for Windows), without the
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"configure" script
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lp1624b02.7z (LZMA-compressed, recommended)
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lp1624b02.zip
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Other information:
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1.6.24beta02-README.txt
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1.6.24beta02-LICENSE.txt
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libpng-1.6.24beta02-*.asc (armored detached GPG signatures)
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Changes since the last public release (1.6.23):
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Version 1.6.24beta01 [June 11, 2016]
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Avoid potential overflow of the PNG_IMAGE_SIZE macro. This macro
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is not used within libpng, but is used in some of the examples.
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Version 1.6.24beta02 [June 20, 2016]
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Correct filter heuristic overflow handling. This was broken when the
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write filter code was moved out-of-line; if there is a single filter and
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the heuristic sum overflows the calculation of the filtered line is not
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completed. In versions prior to 1.6 the code was duplicated in-line
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and the check not performed, so the filter operation completed; however,
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in the multi-filter case where the sum is performed the 'none' filter would
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be selected if all the sums overflowed, even if it wasn't in the filter
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list. The fix to the first problem is simply to provide PNG_SIZE_MAX as
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the current lmins sum value; this means the sum can never exceed it and
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overflows silently. A reasonable compiler that does choose to inline
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the code will simply eliminate the sum check.
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The fix to the second problem is to use high precision arithmetic (this is
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implemented in 1.7), however a simple safe fix here is to chose the lowest
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numbered filter in the list from png_set_filter (this only works if the
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first problem is also fixed) (John Bowler).
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Use a more efficient absolute value calculation on SSE2 (Matthieu Darbois).
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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(subscription required; visit
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https://lists.sourceforge.net/lists/listinfo/png-mng-implement
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to subscribe)
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or to glennrp at users.sourceforge.net
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Glenn R-P
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