| 1 | 2.1 |
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. |
| 2 | - get rid of memcpy. |
72 | - get rid of memcpy. |
| 3 | - tentatively use rep movsb on x86 and x86_64 (gcc only) for a |
73 | - tentatively use rep movsb on x86 and x86_64 (gcc only) for a |
| 4 | moderate speed improvement. |
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 | |
| 6 | 2.0 Fri Feb 16 23:11:18 CET 2007 |
78 | 2.0 Fri Feb 16 23:11:18 CET 2007 |
| 7 | - replaced lzf demo by industrial-strength lzf utility with behaviour |
79 | - replaced lzf demo by industrial-strength lzf utility with behaviour |
| 8 | similar other compression utilities. Thanks for Stefan Traby for |
80 | similar other compression utilities. Thanks for Stefan Traby for |
| 9 | rewriting it! |
81 | rewriting it! |
| … | |
… | |
| 24 | - default HLOG size is now 15 (cpu caches have increased). |
96 | - default HLOG size is now 15 (cpu caches have increased). |
| 25 | - documentation fixes. |
97 | - documentation fixes. |
| 26 | |
98 | |
| 27 | 1.51 Thu Apr 14 22:15:46 CEST 2005 |
99 | 1.51 Thu Apr 14 22:15:46 CEST 2005 |
| 28 | - incorporated C♯ implementation of both the en- and decoder, |
100 | - incorporated C♯ implementation of both the en- and decoder, |
| 29 | written by "Oren J. Maurice <oymaurice@hazorea.org.il>". |
101 | written by "Oren J. Maurice". |
| 30 | You can find it in the cs/ subdirectory. |
102 | You can find it in the cs/ subdirectory. |
| 31 | - make FRST, NEXT IDX overridable if lzf_c.c is directly included |
103 | - make FRST, NEXT IDX overridable if lzf_c.c is directly included |
| 32 | in the code. |
104 | in the code. |
| 33 | |
105 | |
| 34 | 1.5 Tue Mar 8 20:23:23 CET 2005 |
106 | 1.5 Tue Mar 8 20:23:23 CET 2005 |
