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[master] Imported from libpng-1.6.19.tar
This commit is contained in:
Glenn Randers-Pehrson
153
ANNOUNCE
153
ANNOUNCE
@@ -1,4 +1,4 @@
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Libpng 1.6.18 - July 23, 2015
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Libpng 1.6.19 - November 12, 2015
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This is a public release of libpng, intended for use in production codes.
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@@ -7,79 +7,104 @@ 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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libpng-1.6.18.tar.xz (LZMA-compressed, recommended)
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libpng-1.6.18.tar.gz
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libpng-1.6.19.tar.xz (LZMA-compressed, recommended)
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libpng-1.6.19.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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lpng1618.7z (LZMA-compressed, recommended)
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lpng1618.zip
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lpng1619.7z (LZMA-compressed, recommended)
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lpng1619.zip
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Other information:
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libpng-1.6.18-README.txt
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libpng-1.6.18-LICENSE.txt
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libpng-1.6.18-*.asc (armored detached GPG signatures)
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libpng-1.6.19-README.txt
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libpng-1.6.19-LICENSE.txt
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libpng-1.6.19-*.asc (armored detached GPG signatures)
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Changes since the last public release (1.6.17):
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Removed PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED macros. They
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have been combined with PNG_SET_USER_LIMITS_SUPPORTED (resolves
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bug report by Andrew Church).
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Fixed rgb_to_gray checks and added tRNS checks to pngvalid.c. This
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fixes some arithmetic errors that caused some tests to fail on
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some 32-bit platforms (Bug reports by Peter Breitenlohner [i686]
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and Petr Gajdos [i586]).
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Changes since the last public release (1.6.18):
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Updated obsolete information about the simplified API macros in the
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manual pages (Bug report by Arc Riley).
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Avoid potentially dereferencing NULL info_ptr in png_info_init_3().
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Rearranged png.h to put the major sections in the same order as
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in libpng17.
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Eliminated unused PNG_COST_SHIFT, PNG_WEIGHT_SHIFT, PNG_COST_FACTOR, and
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PNG_WEIGHT_FACTOR macros.
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Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
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(Bug report by Viktor Szaka'ts).
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Replaced "unexpected" with an integer (0xabadca11) in pngset.c
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where a long was expected, to avoid a compiler warning when PNG_DEBUG > 1.
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Added contrib/examples/simpleover.c, to demonstrate how to handle
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alpha compositing of multiple images, using the "simplified API"
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and an example PNG generation tool, contrib/examples/genpng.c
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(Bug report by Viktor Szakats). Several warnings remain and are
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unavoidable, where we test for overflow.
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Fixed potential leak of png_pixels in contrib/pngminus/pnm2png.c
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Fixed uninitialized variable in contrib/gregbook/rpng2-x.c
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Moved config.h.in~ from the "libpng_autotools_files" list to the
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"libpng_autotools_extra" list in autogen.sh because it was causing a
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false positive for missing files (bug report by Robert C. Seacord).
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Removed unreachable "break" statements in png.c, pngread.c, and pngrtran.c
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to suppress clang warnings (Bug report by Viktor Szakats).
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Fixed some bad links in the man page.
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Changed "n bit" to "n-bit" in comments.
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Added signed/unsigned 16-bit safety net. This removes the dubious
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0x8000 flag definitions on 16-bit systems. They aren't supported
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yet the defs *probably* work, however it seems much safer to do this
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and be advised if anyone, contrary to advice, is building libpng 1.6
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on a 16-bit system. It also adds back various switch default clauses
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for GCC; GCC errors out if they are not present (with an appropriately
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high level of warnings).
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Safely convert num_bytes to a png_byte in png_set_sig_bytes() (Robert
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Seacord).
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Fixed the recently reported 1's complement security issue by replacing
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the value that is illegal in the PNG spec, in both signed and unsigned
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values, with 0. Illegal unsigned values (anything greater than or equal
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to 0x80000000) can still pass through, but since these are not illegal
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in ANSI-C (unlike 0x80000000 in the signed case) the checking that
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occurs later can catch them (John Bowler).
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Fixed png_save_int_32 when int is not 2's complement (John Bowler).
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Updated libpng16 with all the recent test changes from libpng17,
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including changes to pngvalid.c to ensure that the original,
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distributed, version of contrib/visupng/cexcept.h can be used
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(John Bowler).
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PNG_RELEASE_BUILD replaces tests where the code depended on the build base
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type and can be defined on the command line, allowing testing in beta
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builds (John Bowler).
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Avoid Coverity issue 80858 (REVERSE NULL) in pngtest.c
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Avoid a harmless potential integer overflow in png_XYZ_from_xy() (Bug
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report from Christopher Ferris).
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Backport filter selection code from libpng-1.7.0beta51, to combine
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sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
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Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
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to avoid confusion with the libpng private macros.
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Fixed old cut&paste bug in the weighted filter selection code in
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pngwutil.c, introduced in libpng-0.95, March 1997.
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Removed WRITE_WEIGHTED_FILTERED code, to save a few kbytes of the
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compiled library size. It never worked properly and as far as we can
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tell, no one uses it. The png_set_filter_heuristics() and
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png_set_filter_heuristics_fixed() APIs are retained but deprecated
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and do nothing.
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Quieted some Coverity issues in pngfix.c, png-fix-itxt.c, pngvalid.c,
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pngstest.c, and pngimage.c. Most seem harmless, but png-fix-itxt
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would only work with iTXt chunks with length 255 or less.
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Removed non-working progressive reader 'skip' function. This
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function has apparently never been used. It was implemented
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to support back-door modification of png_struct in libpng-1.4.x
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but (because it does nothing and cannot do anything) was apparently
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never tested (John Bowler).
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Fixed cexcept.h in which GCC 5 now reports that one of the auto
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variables in the Try macro needs to be volatile to prevent value
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being lost over the setjmp (John Bowler).
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Added #ifdef's to contrib/examples programs so people don't try
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to compile them without the minimum required support enabled
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(suggested by Flavio Medeiros).
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Eliminated the final two Coverity defects (insecure temporary file
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handling in contrib/libtests/pngstest.c; possible overflow of
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unsigned char in contrib/tools/png-fix-itxt.c). To use the "secure"
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file handling, define PNG_USE_MKSTEMP, otherwise "tmpfile()" will
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be used.
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Removed some unused WEIGHTED_FILTER macros from pngstruct.h
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Replaced arbitrary use of 'extern' with #define PNG_LINKAGE_*. To
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preserve API compatibility, the new defines all default to "extern"
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(requested by Jan Nijtmans).
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Belatedly added Mans Rullgard and James Yu to the list of Contributing
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Authors.
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pngvalid contains the correction to the use of SAVE/STORE_
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UNKNOWN_CHUNKS; a bug revealed by changes in libpng 1.7. More
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tests contain the --strict option to detect warnings and the
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pngvalid-standard test has been corrected so that it does not
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turn on progressive-read. There is a separate test which does
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that. (John Bowler)
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Also made some signed/unsigned fixes.
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Make pngstest error limits version specific. Splitting the machine
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generated error structs out to a file allows the values to be updated
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without changing pngstest.c itself. Since libpng 1.6 and 1.7 have
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slightly different error limits this simplifies maintenance. The
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makepngs.sh script has also been updated to more accurately reflect
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current problems in libpng 1.7 (John Bowler).
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Incorporated new test PNG files into make check. tests/pngstest-*
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are changed so that the new test files are divided into 8 groups by
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gamma and alpha channel. These tests have considerably better code
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and pixel-value coverage than contrib/pngsuite; however,coverage is
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still incomplete (John Bowler).
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Removed the '--strict' in 1.6 because of the double-gamma-correction
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warning, updated pngstest-errors.h for the errors detected with the
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new contrib/testspngs PNG test files (John Bowler).
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Worked around rgb-to-gray issues in libpng 1.6. The previous
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attempts to ignore the errors in the code aren't quite enough to
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deal with the 'channel selection' encoding added to libpng 1.7; abort.
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Fixed 'pow' macros in pngvalid.c. It is legal for 'pow' to be a
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macro, therefore the argument list cannot contain preprocessing
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directives. Make sure pow is a function where this happens. This is
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a minimal safe fix, the issue only arises in non-performance-critical
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code (bug report by Curtis Leach, fix by John Bowler).
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Added sPLT support to pngtest.c
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Prevent setting or writing over-length PLTE chunk (Cosmin Truta).
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Silently truncate over-length PLTE chunk while reading.
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Libpng incorrectly calculated the output rowbytes when the application
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decreased either the number of channels or the bit depth (or both) in
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a user transform. This was safe; libpng overallocated buffer space
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(potentially by quite a lot; up to 4 times the amount required) but,
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from 1.5.4 on, resulted in a png_error (John Bowler).
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Fixed some inconsequential cut-and-paste typos in png_set_cHRM_XYZ_fixed().
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Clarified COPYRIGHT information to state explicitly that versions
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are derived from previous versions.
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Removed much of the long list of previous versions from png.h and
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libpng.3.
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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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