1 3.6 Mon Feb 7 17:37:31 CET 2011 2 - fixed hash calculation in C version (Tiago Freitas Leal). 3 - unroll copy for small sizes, use memcpy for larger sizes, 4 greatly speeding up decompression in most cases. 5 - finally disable rep movsb - it's a big loss on modern intel cpus, 6 and only a small win on amd cpus. 7 - improve C++ compatibility of the code. 8 - slightly improve compressor speed. 9 - halved memory requirements for compressor on 64 bit architectures, 10 which can improve the speed quite a bit on older cpus. 11 12 3.5 Fri May 1 02:28:42 CEST 2009 13 - lzf_compress did sometimes write one octet past the given output 14 buffer (analyzed and nice testcase by Salvatore Sanfilippo). 15 16 3.4 Tue Sep 2 06:45:00 CEST 2008 17 - the fix from 3.3 introduced a compression bug, which is fixed in 18 this release (which explains the mysterious prerelease...). Thanks 19 once more to Clment Calmels. 20 21 3.3 Mon Aug 25 03:17:42 CEST 2008 22 - lzf_compress could access memory after the given input buffer 23 when outputting back references. reported with nice testcase 24 by Clment Calmels. 25 26 3.2 Fri May 9 18:52:23 CEST 2008 27 - include a workaround for failing POSIX and real-world compliance 28 on 64 bit windows (microsoft claims to support POSIX, but is far 29 from it). (bug found and analysed nicely by John Lilley). 30 31 3.1 Fri Nov 30 11:33:04 CET 2007 32 - IMPORTANT BUGFIX: a too long final literal run would corrupt data 33 in the encoder (this was introduced in 3.0 only, earlier versions 34 are safe). 35 36 3.0 Tue Nov 13 22:13:09 CET 2007 37 - switched to 2-clause bsd with "GPL v2 or any later version" option. 38 - speed up compression by ~10-15% in common cases 39 by some manual unrolling. 40 - import some compiler tricks from JSON::XS, for further speed-ups. 41 - tune hash functions depending on ULTRA_FAST or VERY_FAST settings. 42 - for typical binary data (e.g. /bin/bash, memory dumps, 43 canterbury corpus etc.), speed is now comparable to fastlz, but 44 with better compression ratio. with ULTRA_FAST, it's typically 45 3-15% faster than fastlz while still maintaining a similar ratio. 46 (amd64 and core 2 duo, ymmv). thanks a lot for the competition :) 47 - undo inline assembly in compressor, it is no longer helpful. 48 - no changes to the decompressor. 49 - use a HLOG of 16 by default now (formerly 15). 50 51 2.1 Fri Nov 2 13:34:42 CET 2007 52 - switched to a 2-clause bsd license with GPL exception. 53 - get rid of memcpy. 54 - tentatively use rep movsb on x86 and x86_64 (gcc only) for a 55 moderate speed improvement. 56 - applied patch by Kein-Hong Man to maske lzf.c compile under 57 the crippled mingw32 environment. 58 59 2.0 Fri Feb 16 23:11:18 CET 2007 60 - replaced lzf demo by industrial-strength lzf utility with behaviour 61 similar other compression utilities. Thanks for Stefan Traby for 62 rewriting it! 63 - fix state arg prototype. 64 65 1.7 Wed Sep 27 17:29:15 CEST 2006 66 - remove bogus "unlzf" patch. 67 note to self: never accept well-meant patches. 68 - make lzf more robust in presence of padding bytes or sudden eof. 69 70 1.6 Fri Jul 7 17:31:26 CEST 2006 71 - the lzf example utility will now uncompress if invoked 72 as "unlzf" (patch by Scott Feeney). 73 - add CHECK_INPUT option that adds more checks for input 74 data validity. 75 - help applications that do not pass in the correct length 76 (such as php) by returning either EINVAL or E2BIG. 77 - default HLOG size is now 15 (cpu caches have increased). 78 - documentation fixes. 79 80 1.51 Thu Apr 14 22:15:46 CEST 2005 81 - incorporated C implementation of both the en- and decoder, 82 written by "Oren J. Maurice". 83 You can find it in the cs/ subdirectory. 84 - make FRST, NEXT IDX overridable if lzf_c.c is directly included 85 in the code. 86 87 1.5 Tue Mar 8 20:23:23 CET 2005 88 - incorporated improvements by Adam D. Moss, 89 which includes a new VERY_FAST mode which is 90 a bit slower than ULTRA_FAST but much better, 91 and enabled it as default. 92 93 1.401 Thu Mar 3 18:00:52 CET 2005 94 - use cstring in c++, not string.h. 95 - change of contact address. 96 97 1.4 Wed Dec 15 08:08:49 CET 2004 98 - very very slight tuning of the hashing function. 99 100 1.3 Thu Mar 25 15:41:17 CET 2004 101 - changed license of lzf core code to explicitly allow 102 relicensing under the GPLv2. 103 - added VPATH support as suggested by Bjrn Eriksson. 104 105 1.2 Mon Dec 29 13:47:28 CET 2003 106 - avoid spurious memory accesses after the to-be-compressed 107 memory region. originally reported by Michal Zalewski. 108 - flip LZF_STACK_ARG meaning (to be correct). 109 110 1.1 Tue Dec 23 05:48:32 CET 2003 111 - removed #warn directive, it's not worth the hassle. 112 - add LZF_STACK_ARG and AVOID_ERRNO configurations 113 for embedded systems. 114 - make it compile cleanly as c++. 115 - some small documentation and code fixes. 116 117 1.0 Sun Nov 17 12:37:37 CET 2002 118 - slightly better compression ratio, almost unmeasurably 119 slower. 120 - some documentation fixes. 121 122 0.4 Thu Jun 13 14:11:10 CEST 2002 123 - typoe fix. 124 - lzf demo program now properly decompresses small files. 125 - fix another 64 bit issue, found by Laurent Deniel. 126 127 0.3 Tue Jan 16 13:21:14 CET 2001 128 - fix silly beginners 32/64 bit mistake. 129 130 0.2 Thu Jan 4 05:56:42 CET 2001 131 - now totally independent of autoconfig, for 132 easy inclusion into other programs. 133 - much better fine-tuning, faster and better than 0.1. 134 135 0.1 2000 136 - initial release. 137
