xz.git - XZ Utils

Age	Commit message (Collapse)	Author	Files	Lines
2019-07-13	liblzma: Avoid memcpy(NULL, foo, 0) because it is undefined behavior.	Lasse Collin	1	-3/+9
	I should have always known this but I didn't. Here is an example as a reminder to myself: int mycopy(void dest, void src, size_t n) { memcpy(dest, src, n); return dest == NULL; } In the example, a compiler may assume that dest != NULL because passing NULL to memcpy() would be undefined behavior. Testing with GCC 8.2.1, mycopy(NULL, NULL, 0) returns 1 with -O0 and -O1. With -O2 the return value is 0 because the compiler infers that dest cannot be NULL because it was already used with memcpy() and thus the test for NULL gets optimized out. In liblzma, if a null-pointer was passed to memcpy(), there were no checks for NULL after the memcpy() call, so I cautiously suspect that it shouldn't have caused bad behavior in practice, but it's hard to be sure, and the problematic cases had to be fixed anyway. Thanks to Jeffrey Walton.
2019-07-13	spelling	Antoine Cœur	1	-1/+1

2016-12-28	liblzma: Avoid multiple definitions of lzma_coder structures.	Lasse Collin	1	-27/+33
	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
2012-07-17	liblzma: Make the use of lzma_allocator const-correct.	Lasse Collin	1	-4/+4
	There is a tiny risk of causing breakage: If an application assigns lzma_stream.allocator to a non-const pointer, such code won't compile anymore. I don't know why anyone would do such a thing though, so in practice this shouldn't cause trouble. Thanks to Jan Kratochvil for the patch.
2011-05-17	Add underscores to attributes (__attribute((__foo__))).	Lasse Collin	1	-1/+1

2010-05-26	Rename MIN() and MAX() to my_min() and my_max().	Lasse Collin	1	-3/+4
	This should avoid some minor portability issues.
2009-11-15	Fix wrong indentation caused by incorrect settings	Lasse Collin	1	-9/+9
	in the text editor.
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.
2009-01-27	Added initial support for preset dictionary for raw LZMA1	Lasse Collin	1	-10/+25
	and LZMA2. It is not supported by the .xz format or the xz command line tool yet.
2008-12-15	The LZMA2 decoder fix introduced a bug to LZ decoder,	Lasse Collin	1	-10/+23
	which made LZ decoder return too early after dictionary reset. This fixes it.
2008-12-15	Fix data corruption in LZMA2 decoder.	Lasse Collin	1	-1/+16

2008-09-13	LZ decoder cleanup	Lasse Collin	1	-3/+2

2008-09-13	Renamed constants:	Lasse Collin	1	-1/+1
	- LZMA_VLI_VALUE_MAX -> LZMA_VLI_MAX - LZMA_VLI_VALUE_UNKNOWN -> LZMA_VLI_UNKNOWN - LZMA_HEADER_ERRRO -> LZMA_OPTIONS_ERROR
2008-08-28	Sort of garbage collection commit. :-\| Many things are still	Lasse Collin	1	-373/+174
	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.
2008-06-18	Update the code to mostly match the new simpler file format	Lasse Collin	1	-3/+3
	specification. Simplify things by removing most of the support for known uncompressed size in most places. There are some miscellaneous changes here and there too. The API of liblzma has got many changes and still some more will be done soon. While most of the code has been updated, some things are not fixed (the command line tool will choke with invalid filter chain, if nothing else). Subblock filter is somewhat broken for now. It will be updated once the encoded format of the Subblock filter has been decided.
2008-03-11	Initialize the last byte of the dictionary to zero so that	Lasse Collin	1	-0/+1
	lz_get_byte(lz, 0) returns zero. This was broken by 1a3b21859818e4d8e89a1da99699233c1bfd197d.
2008-03-10	Always initialize lz->temp_size in lz_decoder.c. temp_size did	Lasse Collin	1	-5/+6
	get initialized as a side-effect after allocating a new decoder, but not when the decoder was reused.
2008-02-02	Don't memzero() the history buffer when initializing LZ	Lasse Collin	1	-4/+3
	decoder. There's no danger of information leak here, so it isn't required. Doing memzero() takes a lot of time with large dictionaries, which could make it easier to construct DoS attack to consume too much CPU time.