xz.git - XZ Utils

Age	Commit message (Collapse)	Author	Files	Lines
2022-11-27	liblzma: Add LZMA_FILTER_LZMA1EXT to support LZMA1 without end marker.	Lasse Collin	1	-0/+3
	Some file formats need support for LZMA1 streams that don't use the end of payload marker (EOPM) alias end of stream (EOS) marker. So far liblzma API has supported decompressing such streams via lzma_alone_decoder() when .lzma header specifies a known uncompressed size. Encoding support hasn't been available in the API. Instead of adding a new LZMA1-only API for this purpose, this commit adds a new filter ID for use with raw encoder and decoder. The main benefit of this approach is that then also filter chains are possible, for example, if someone wants to implement support for .7z files that use the x86 BCJ filter with LZMA1 (not BCJ2 as that isn't supported in liblzma).
2021-01-14	liblzma: Add rough support for output-size-limited encoding in LZMA1.	Lasse Collin	1	-0/+12
	With this it is possible to encode LZMA1 data without EOPM so that the encoder will encode as much input as it can without exceeding the specified output size limit. The resulting LZMA1 stream will be a normal LZMA1 stream without EOPM. The actual uncompressed size will be available to the caller via the uncomp_size pointer. One missing thing is that the LZMA layer doesn't inform the LZ layer when the encoding is finished and thus the LZ may read more input when it won't be used. However, this doesn't matter if encoding is done with a single call (which is the planned use case for now). For proper multi-call encoding this should be improved. This commit only adds the functionality for internal use. Nothing uses it yet.
2019-12-31	Rename unaligned_read32ne to read32ne, and similarly for the others.	Lasse Collin	1	-2/+1

2019-06-01	liblzma: Use unaligned_readXXne functions instead of type punning.	Lasse Collin	1	-1/+1
	Now gcc -fsanitize=undefined should be clean. Thanks to Jeffrey Walton.
2016-11-21	liblzma: Avoid multiple definitions of lzma_coder structures.	Lasse Collin	1	-3/+3
	Only one definition was visible in a translation unit. It avoided a few casts and temp variables but seems that this hack doesn't work with link-time optimizations in compilers as it's not C99/C11 compliant. Fixes: http://www.mail-archive.com/xz-devel@tukaani.org/msg00279.html
2010-10-26	liblzma: Rename a few variables and constants.	Lasse Collin	1	-8/+8
	This has no semantic changes. I find the new names slightly more logical and they match the names that are already used in XZ Embedded. The name fastpos wasn't changed (not worth the hassle).
2010-02-12	Collection of language fixes to comments and docs.	Lasse Collin	1	-1/+1
	Thanks to Jonathan Nieder.
2009-10-04	Use a tuklib module for integer handling.	Lasse Collin	1	-1/+1
	This replaces bswap.h and integer.h. The tuklib module uses <byteswap.h> on GNU, <sys/endian.h> on *BSDs and <sys/byteorder.h> on Solaris, which may contain optimized code like inline assembly.
2009-04-13	Put the interesting parts of XZ Utils into the public domain.	Lasse Collin	1	-12/+5
	Some minor documentation cleanups were made at the same time.
2008-08-28	Sort of garbage collection commit. :-\| Many things are still	Lasse Collin	1	-110/+64
	broken. API has changed a lot and it will still change a little more here and there. The command line tool doesn't have all the required changes to reflect the API changes, so it's easy to get "internal error" or trigger assertions.
2008-06-19	Add limit of lc + lp <= 4. Now we can allocate the	Lasse Collin	1	-1/+1
	literal coder as part of the main LZMA encoder or decoder structure. Make the LZMA decoder to rely on the current internal API to free the allocated memory in case an error occurs.
2008-06-01	Fix a buffer overflow in the LZMA encoder. It was due to my	Lasse Collin	1	-10/+5
	misunderstanding of the code. There's no tiny fix for this problem, so I also cleaned up the code in general. This reduces the speed of the encoder 2-5 % in the fastest compression mode ("lzma -1"). High compression modes should have no noticeable performance difference. This commit breaks things (especially LZMA_SYNC_FLUSH) but I will fix them once the new format and LZMA2 has been roughly implemented. Plain LZMA won't support LZMA_SYNC_FLUSH at all and won't be supported in the new .lzma format. This may change still but this is what it looks like now. Support for known uncompressed size (that is, LZMA or LZMA2 without EOPM) is likely to go away. This means there will be API changes.
2008-03-22	Demystified the "state" variable in LZMA code. Use the	Lasse Collin	1	-4/+4
	word literal instead of char for better consistency. There are still some names with _char instead of _literal in lzma_optimum, these may be changed later. Renamed length coder variables. This commit doesn't change the program logic.
2008-01-15	Revised the fastpos code. It now uses the slightly faster	Lasse Collin	1	-21/+0
	table-based version from LZMA SDK 4.57. This should be fast on most systems. A simpler and smaller alternative version is also provided. On some CPUs this can be even a little faster than the default table-based version (see comments in fastpos.h), but on most systems the table-based code is faster.
2008-01-14	Remove RC_BUFFER_SIZE from lzma_encoder_private.h	Lasse Collin	1	-2/+4
	and replace it with a sanity check.
2008-01-14	In lzma_read_match_distances(), don't use	Lasse Collin	1	-3/+3
	coder->lz.stream_end_was_reached. That variable will be removed, and the check isn't required anyway. Rearrange the check so that it doesn't make one to think that there could be an integer overflow.