NEWS		NEWS
	XZ Utils Release Notes		XZ Utils Release Notes
	======================		======================
			5.2.0 (2014-12-21)
			Since 5.1.4beta:
			* All fixes from 5.0.8
			* liblzma: Fixed lzma_stream_encoder_mt_memusage() when a preset
			was used.
			* xzdiff: If mktemp isn't installed, mkdir will be used as
			a fallback to create a temporary directory. Installing mktemp
			is still recommended.
			* Updated French, German, Italian, Polish, and Vietnamese
			translations.
			Summary of fixes and new features added in the 5.1.x development
			releases:
			* liblzma:
			- Added support for multi-threaded compression. See the
			lzma_mt structure, lzma_stream_encoder_mt(), and
			lzma_stream_encoder_mt_memusage() in <lzma/container.h>,
			lzma_get_progress() in <lzma/base.h>, and lzma_cputhreads()
			in <lzma/hardware.h> for details.
			- Made the uses of lzma_allocator const correct.
			- Added lzma_block_uncomp_encode() to create uncompressed
			.xz Blocks using LZMA2 uncompressed chunks.
			- Added support for LZMA_IGNORE_CHECK.
			- A few speed optimizations were made.
			- Added support for symbol versioning. It is enabled by default
			on GNU/Linux, other GNU-based systems, and FreeBSD.
			- liblzma (not the whole XZ Utils) should now be buildable
			with MSVC 2013 update 2 or later using windows/config.h.
			* xz:
			- Fixed a race condition in the signal handling. It was
			possible that e.g. the first SIGINT didn't make xz exit
			if reading or writing blocked and one had bad luck. The fix
			is non-trivial, so as of writing it is unknown if it will be
			backported to the v5.0 branch.
			- Multi-threaded decompression can be enabled with the
			--threads (-T) option.
			- New command line options in xz: --single-stream,
			--block-size=SIZE, --block-list=SIZES,
			--flush-timeout=TIMEOUT, and --ignore-check.
			- xz -lvv now shows the minimum xz version that is required to
			decompress the file. Currently it is 5.0.0 for all supported
			.xz files except files with empty LZMA2 streams require 5.0.2.
			* xzdiff and xzgrep now support .lzo files if lzop is installed.
			The .tzo suffix is also recognized as a shorthand for .tar.lzo.
			5.1.4beta (2014-09-14)
			* All fixes from 5.0.6
			* liblzma: Fixed the use of presets in threaded encoder
			initialization.
			* xz --block-list and --block-size can now be used together
			in single-threaded mode. Previously the combination only
			worked in multi-threaded mode.
			* Added support for LZMA_IGNORE_CHECK to liblzma and made it
			available in xz as --ignore-check.
			* liblzma speed optimizations:
			- Initialization of a new LZMA1 or LZMA2 encoder has been
			optimized. (The speed of reinitializing an already-allocated
			encoder isn't affected.) This helps when compressing many
			small buffers with lzma_stream_buffer_encode() and other
			similar situations where an already-allocated encoder state
			isn't reused. This speed-up is visible in xz too if one
			compresses many small files one at a time instead running xz
			once and giving all files as command-line arguments.
			- Buffer comparisons are now much faster when unaligned access
			is allowed (configured with --enable-unaligned-access). This
			speeds up encoding significantly. There is arch-specific code
			for 32-bit and 64-bit x86 (32-bit needs SSE2 for the best
			results and there's no run-time CPU detection for now).
			For other archs there is only generic code which probably
			isn't as optimal as arch-specific solutions could be.
			- A few speed optimizations were made to the SHA-256 code.
			(Note that the builtin SHA-256 code isn't used on all
			operating systems.)
			* liblzma can now be built with MSVC 2013 update 2 or later
			using windows/config.h.
			* Vietnamese translation was added.
			5.1.3alpha (2013-10-26)
			* All fixes from 5.0.5
			* liblzma:
			- Fixed a deadlock in the threaded encoder.
			- Made the uses of lzma_allocator const correct.
			- Added lzma_block_uncomp_encode() to create uncompressed
			.xz Blocks using LZMA2 uncompressed chunks.
			- Added support for native threads on Windows and the ability
			to detect the number of CPU cores.
			* xz:
			- Fixed a race condition in the signal handling. It was
			possible that e.g. the first SIGINT didn't make xz exit
			if reading or writing blocked and one had bad luck. The fix
			is non-trivial, so as of writing it is unknown if it will be
			backported to the v5.0 branch.
			- Made the progress indicator work correctly in threaded mode.
			- Threaded encoder now works together with --block-list=SIZES.
			- Added preliminary support for --flush-timeout=TIMEOUT.
			It can be useful for (somewhat) real-time streaming. For
			now the decompression side has to be done with something
			else than the xz tool due to how xz does buffering, but this
			should be fixed.
	5.1.2alpha (2012-07-04)		5.1.2alpha (2012-07-04)
	* All fixes from 5.0.3 and 5.0.4		* All fixes from 5.0.3 and 5.0.4
	* liblzma:		* liblzma:
	- Fixed a deadlock and an invalid free() in the threaded encoder.		- Fixed a deadlock and an invalid free() in the threaded encoder.
	- Added support for symbol versioning. It is enabled by default		- Added support for symbol versioning. It is enabled by default
	on GNU/Linux, other GNU-based systems, and FreeBSD.		on GNU/Linux, other GNU-based systems, and FreeBSD.
	skipping to change at line 87		skipping to change at line 227
	to reduce the memory usage.		to reduce the memory usage.
	* Added the options --single-stream and --block-size=SIZE to xz.		* Added the options --single-stream and --block-size=SIZE to xz.
	* xzdiff and xzgrep now support .lzo files if lzop is installed.		* xzdiff and xzgrep now support .lzo files if lzop is installed.
	The .tzo suffix is also recognized as a shorthand for .tar.lzo.		The .tzo suffix is also recognized as a shorthand for .tar.lzo.
	* Support for short 8.3 filenames under DOS was added to xz. It is		* Support for short 8.3 filenames under DOS was added to xz. It is
	experimental and may change before it gets into a stable release.		experimental and may change before it gets into a stable release.
			5.0.8 (2014-12-21)
			* Fixed an old bug in xzgrep that affected OpenBSD and probably
			a few other operating systems too.
			* Updated French and German translations.
			* Added support for detecting the amount of RAM on AmigaOS/AROS.
			* Minor build system updates.
			5.0.7 (2014-09-20)
			* Fix regressions introduced in 5.0.6:
			- Fix building with non-GNU make.
			- Fix invalid Libs.private value in liblzma.pc which broke
			static linking against liblzma if the linker flags were
			taken from pkg-config.
			5.0.6 (2014-09-14)
			* xzgrep now exits with status 0 if at least one file matched.
			* A few minor portability and build system fixes
			5.0.5 (2013-06-30)
			* lzmadec and liblzma's lzma_alone_decoder(): Support decompressing
			.lzma files that have less common settings in the headers
			(dictionary size other than 2^n or 2^n + 2^(n-1), or uncompressed
			size greater than 256 GiB). The limitations existed to avoid false
			positives when detecting .lzma files. The lc + lp <= 4 limitation
			still remains since liblzma's LZMA decoder has that limitation.
			NOTE: xz's .lzma support or liblzma's lzma_auto_decoder() are NOT
			affected by this change. They still consider uncommon .lzma headers
			as not being in the .lzma format. Changing this would give way too
			many false positives.
			* xz:
			- Interaction of preset and custom filter chain options was
			made less illogical. This affects only certain less typical
			uses cases so few people are expected to notice this change.
			Now when a custom filter chain option (e.g. --lzma2) is
			specified, all preset options (-0 ... -9, -e) earlier are on
			the command line are completely forgotten. Similarly, when
			a preset option is specified, all custom filter chain options
			earlier on the command line are completely forgotten.
			Example 1: "xz -9 --lzma2=preset=5 -e" is equivalent to "xz -e"
			which is equivalent to "xz -6e". Earlier -e didn't put xz back
			into preset mode and thus the example command was equivalent
			to "xz --lzma2=preset=5".
			Example 2: "xz -9e --lzma2=preset=5 -7" is equivalent to
			"xz -7". Earlier a custom filter chain option didn't make
			xz forget the -e option so the example was equivalent to
			"xz -7e".
			- Fixes and improvements to error handling.
			- Various fixes to the man page.
			* xzless: Fixed to work with "less" versions 448 and later.
			* xzgrep: Made -h an alias for --no-filename.
			* Include the previously missing debug/translation.bash which can
			be useful for translators.
			* Include a build script for Mac OS X. This has been in the Git
			repository since 2010 but due to a mistake in Makefile.am the
			script hasn't been included in a release tarball before.
	5.0.4 (2012-06-22)		5.0.4 (2012-06-22)
	* liblzma:		* liblzma:
	- Fix lzma_index_init(). It could crash if memory allocation		- Fix lzma_index_init(). It could crash if memory allocation
	failed.		failed.
	- Fix the possibility of an incorrect LZMA_BUF_ERROR when a BCJ		- Fix the possibility of an incorrect LZMA_BUF_ERROR when a BCJ
	filter is used and the application only provides exactly as		filter is used and the application only provides exactly as
	much output space as is the uncompressed size of the file.		much output space as is the uncompressed size of the file.
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