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163 lines
6.2 KiB
Text
163 lines
6.2 KiB
Text
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XZ Utils Release Notes
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======================
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5.0.4 (2012-06-22)
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* liblzma:
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- Fix lzma_index_init(). It could crash if memory allocation
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failed.
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- Fix the possibility of an incorrect LZMA_BUF_ERROR when a BCJ
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filter is used and the application only provides exactly as
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much output space as is the uncompressed size of the file.
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- Fix a bug in doc/examples_old/xz_pipe_decompress.c. It didn't
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check if the last call to lzma_code() really returned
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LZMA_STREAM_END, which made the program think that truncated
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files are valid.
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- New example programs in doc/examples (old programs are now in
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doc/examples_old). These have more comments and more detailed
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error handling.
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* Fix "xz -lvv foo.xz". It could crash on some corrupted files.
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* Fix output of "xz --robot -lv" and "xz --robot -lvv" which
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incorrectly printed the filename also in the "foo (x/x)" format.
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* Fix exit status of "xzdiff foo.xz bar.xz".
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* Fix exit status of "xzgrep foo binary_file".
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* Fix portability to EBCDIC systems.
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* Fix a configure issue on AIX with the XL C compiler. See INSTALL
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for details.
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* Update French, German, Italian, and Polish translations.
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5.0.3 (2011-05-21)
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* liblzma fixes:
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- A memory leak was fixed.
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- lzma_stream_buffer_encode() no longer creates an empty .xz
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Block if encoding an empty buffer. Such an empty Block with
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LZMA2 data would trigger a bug in 5.0.1 and older (see the
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first bullet point in 5.0.2 notes). When releasing 5.0.2,
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I thought that no encoder creates this kind of files but
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I was wrong.
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- Validate function arguments better in a few functions. Most
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importantly, specifying an unsupported integrity check to
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lzma_stream_buffer_encode() no longer creates a corrupt .xz
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file. Probably no application tries to do that, so this
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shouldn't be a big problem in practice.
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- Document that lzma_block_buffer_encode(),
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lzma_easy_buffer_encode(), lzma_stream_encoder(), and
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lzma_stream_buffer_encode() may return LZMA_UNSUPPORTED_CHECK.
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- The return values of the _memusage() functions are now
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documented better.
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* Fix command name detection in xzgrep. xzegrep and xzfgrep now
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correctly use egrep and fgrep instead of grep.
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* French translation was added.
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5.0.2 (2011-04-01)
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* LZMA2 decompressor now correctly accepts LZMA2 streams with no
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uncompressed data. Previously it considered them corrupt. The
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bug can affect applications that use raw LZMA2 streams. It is
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very unlikely to affect .xz files because no compressor creates
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.xz files with empty LZMA2 streams. (Empty .xz files are a
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different thing than empty LZMA2 streams.)
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* "xz --suffix=.foo filename.foo" now refuses to compress the
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file due to it already having the suffix .foo. It was already
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documented on the man page, but the code lacked the test.
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* "xzgrep -l foo bar.xz" works now.
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* Polish translation was added.
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5.0.1 (2011-01-29)
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* xz --force now (de)compresses files that have setuid, setgid,
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or sticky bit set and files that have multiple hard links.
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The man page had it documented this way already, but the code
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had a bug.
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* gzip and bzip2 support in xzdiff was fixed.
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* Portability fixes
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* Minor fix to Czech translation
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5.0.0 (2010-10-23)
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Only the most important changes compared to 4.999.9beta are listed
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here. One change is especially important:
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* The memory usage limit is now disabled by default. Some scripts
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written before this change may have used --memory=max on xz command
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line or in XZ_OPT. THESE USES OF --memory=max SHOULD BE REMOVED
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NOW, because they interfere with user's ability to set the memory
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usage limit himself. If user-specified limit causes problems to
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your script, blame the user.
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Other significant changes:
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* Added support for XZ_DEFAULTS environment variable. This variable
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allows users to set default options for xz, e.g. default memory
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usage limit or default compression level. Scripts that use xz
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must never set or unset XZ_DEFAULTS. Scripts should use XZ_OPT
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instead if they need a way to pass options to xz via an
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environment variable.
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* The compression settings associated with the preset levels
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-0 ... -9 have been changed. --extreme was changed a little too.
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It is now less likely to make compression worse, but with some
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files the new --extreme may compress slightly worse than the old
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--extreme.
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* If a preset level (-0 ... -9) is specified after a custom filter
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chain options have been used (e.g. --lzma2), the custom filter
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chain will be forgotten. Earlier the preset options were
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completely ignored after custom filter chain options had been
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seen.
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* xz will create sparse files when decompressing if the uncompressed
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data contains long sequences of binary zeros. This is done even
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when writing to standard output that is connected to a regular
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file and certain additional conditions are met to make it safe.
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* Support for "xz --list" was added. Combine with --verbose or
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--verbose --verbose (-vv) for detailed output.
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* I had hoped that liblzma API would have been stable after
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4.999.9beta, but there have been a couple of changes in the
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advanced features, which don't affect most applications:
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- Index handling code was revised. If you were using the old
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API, you will get a compiler error (so it's easy to notice).
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- A subtle but important change was made to the Block handling
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API. lzma_block.version has to be initialized even for
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lzma_block_header_decode(). Code that doesn't do it will work
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for now, but might break in the future, which makes this API
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change easy to miss.
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* The major soname has been bumped to 5.0.0. liblzma API and ABI
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are now stable, so the need to recompile programs linking against
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liblzma shouldn't arise soon.
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