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1 | |
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2 | TODO: try unaligned copy again in decompressor |
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3 | TODO: allow size-optimised binaries by avoiding unrolling |
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4 | TODO: implement lzf_c_best in lzf. |
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5 | TODO: fix lzf_c_best. |
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6 | |
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7 | 3.7 (unreleased) |
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8 | - add lzf_c_best.c, a slower but better compressor. |
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9 | - switch to a multiplicative hash (developed with Steinar Gunderson), |
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10 | which is faster on modern cpus and compresses a bit better. The old |
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11 | hash function which uses only shifts is still available. |
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12 | - allow user configurable hash table slots, which makes it possible |
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13 | to use e.g. 16 bit offsets for a smaller hashtable (if your data is |
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14 | always < 64kb). |
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15 | - use _WIN32, not WIN32, when testing for windows (fails with bcc), |
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16 | patch by Tamas Tevesz. |
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17 | - try to port to win64+gcc, which is non-posix but doesn't have _int64 |
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18 | (reported by Maciej Adamczyk). |
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19 | |
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20 | 3.6 Mon Feb 7 17:37:31 CET 2011 |
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21 | - fixed hash calculation in C♯ version (Tiago Freitas Leal). |
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22 | - unroll copy for small sizes, use memcpy for larger sizes, |
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23 | greatly speeding up decompression in most cases. |
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24 | - finally disable rep movsb - it's a big loss on modern intel cpus, |
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25 | and only a small win on amd cpus. |
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26 | - improve C++ compatibility of the code. |
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27 | - slightly improve compressor speed. |
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28 | - halved memory requirements for compressor on 64 bit architectures, |
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29 | which can improve the speed quite a bit on older cpus. |
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30 | |
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31 | 3.5 Fri May 1 02:28:42 CEST 2009 |
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32 | - lzf_compress did sometimes write one octet past the given output |
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33 | buffer (analyzed and nice testcase by Salvatore Sanfilippo). |
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34 | |
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35 | 3.4 Tue Sep 2 06:45:00 CEST 2008 |
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36 | - the fix from 3.3 introduced a compression bug, which is fixed in |
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37 | this release (which explains the mysterious prerelease...). Thanks |
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38 | once more to Clément Calmels. |
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39 | |
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40 | 3.3 Mon Aug 25 03:17:42 CEST 2008 |
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41 | - lzf_compress could access memory after the given input buffer |
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42 | when outputting back references. reported with nice testcase |
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43 | by Clément Calmels. |
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44 | |
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45 | 3.2 Fri May 9 18:52:23 CEST 2008 |
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46 | - include a workaround for failing POSIX and real-world compliance |
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47 | on 64 bit windows (microsoft claims to support POSIX, but is far |
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48 | from it). (bug found and analysed nicely by John Lilley). |
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49 | |
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50 | 3.1 Fri Nov 30 11:33:04 CET 2007 |
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51 | - IMPORTANT BUGFIX: a too long final literal run would corrupt data |
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52 | in the encoder (this was introduced in 3.0 only, earlier versions |
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53 | are safe). |
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54 | |
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55 | 3.0 Tue Nov 13 22:13:09 CET 2007 |
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56 | - switched to 2-clause bsd with "GPL v2 or any later version" option. |
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57 | - speed up compression by ~10-15% in common cases |
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58 | by some manual unrolling. |
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59 | - import some compiler tricks from JSON::XS, for further speed-ups. |
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60 | - tune hash functions depending on ULTRA_FAST or VERY_FAST settings. |
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61 | - for typical binary data (e.g. /bin/bash, memory dumps, |
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62 | canterbury corpus etc.), speed is now comparable to fastlz, but |
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63 | with better compression ratio. with ULTRA_FAST, it's typically |
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64 | 3-15% faster than fastlz while still maintaining a similar ratio. |
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65 | (amd64 and core 2 duo, ymmv). thanks a lot for the competition :) |
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66 | - undo inline assembly in compressor, it is no longer helpful. |
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67 | - no changes to the decompressor. |
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68 | - use a HLOG of 16 by default now (formerly 15). |
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69 | |
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70 | 2.1 Fri Nov 2 13:34:42 CET 2007 |
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71 | - switched to a 2-clause bsd license with GPL exception. |
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72 | - get rid of memcpy. |
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73 | - tentatively use rep movsb on x86 and x86_64 (gcc only) for a |
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74 | moderate speed improvement. |
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75 | - applied patch by Kein-Hong Man to maske lzf.c compile under |
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76 | the crippled mingw32 environment. |
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77 | |
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78 | 2.0 Fri Feb 16 23:11:18 CET 2007 |
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79 | - replaced lzf demo by industrial-strength lzf utility with behaviour |
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80 | similar other compression utilities. Thanks for Stefan Traby for |
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81 | rewriting it! |
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82 | - fix state arg prototype. |
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83 | |
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84 | 1.7 Wed Sep 27 17:29:15 CEST 2006 |
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85 | - remove bogus "unlzf" patch. |
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86 | note to self: never accept well-meant patches. |
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87 | - make lzf more robust in presence of padding bytes or sudden eof. |
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88 | |
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89 | 1.6 Fri Jul 7 17:31:26 CEST 2006 |
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90 | - the lzf example utility will now uncompress if invoked |
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91 | as "unlzf" (patch by Scott Feeney). |
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92 | - add CHECK_INPUT option that adds more checks for input |
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93 | data validity. |
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94 | - help applications that do not pass in the correct length |
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95 | (such as php) by returning either EINVAL or E2BIG. |
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96 | - default HLOG size is now 15 (cpu caches have increased). |
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97 | - documentation fixes. |
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98 | |
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99 | 1.51 Thu Apr 14 22:15:46 CEST 2005 |
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100 | - incorporated C♯ implementation of both the en- and decoder, |
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101 | written by "Oren J. Maurice". |
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102 | You can find it in the cs/ subdirectory. |
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103 | - make FRST, NEXT IDX overridable if lzf_c.c is directly included |
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104 | in the code. |
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105 | |
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106 | 1.5 Tue Mar 8 20:23:23 CET 2005 |
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107 | - incorporated improvements by Adam D. Moss, |
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108 | which includes a new VERY_FAST mode which is |
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109 | a bit slower than ULTRA_FAST but much better, |
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110 | and enabled it as default. |
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111 | |
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112 | 1.401 Thu Mar 3 18:00:52 CET 2005 |
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113 | - use cstring in c++, not string.h. |
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114 | - change of contact address. |
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115 | |
| 1 | 1.4 Wed Dec 15 08:08:49 CET 2004 |
116 | 1.4 Wed Dec 15 08:08:49 CET 2004 |
| 2 | - very very slight tuning of the hashing function. |
117 | - very very slight tuning of the hashing function. |
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118 | |
| 4 | 1.3 Thu Mar 25 15:41:17 CET 2004 |
119 | 1.3 Thu Mar 25 15:41:17 CET 2004 |
| 5 | - changed license of lzf core code to explicitly allow |
120 | - changed license of lzf core code to explicitly allow |
