[ViewVC] Annotation of: cvs/liblzf/Changes


        - fixed hash calculation in C♯ version (Tiago Freitas Leal).

3.5  Fri May  1 02:28:42 CEST 2009
        - lzf_compress did sometimes write one octet past the given output
          buffer (analyzed and nice testcase by Salvatore Sanfilippo).

3.4  Tue Sep  2 06:45:00 CEST 2008
        - the fix from 3.3 introduced a compression bug, which is fixed in
          this release (which explains the mysterious prerelease...). Thanks
          once more to Clément Calmels.

3.3  Mon Aug 25 03:17:42 CEST 2008
        - lzf_compress could access memory after the given input buffer
          when outputting back references. reported with nice testcase
          by Clément Calmels.

3.2  Fri May  9 18:52:23 CEST 2008
        - include a workaround for failing POSIX and real-world compliance
          on 64 bit windows (microsoft claims to support POSIX, but is far
          from it). (bug found and analysed nicely by John Lilley).

3.1  Fri Nov 30 11:33:04 CET 2007
        - IMPORTANT BUGFIX: a too long final literal run would corrupt data
          in the encoder (this was introduced in 3.0 only, earlier versions
          are safe).

3.0  Tue Nov 13 22:13:09 CET 2007
        - switched to 2-clause bsd with "GPL v2 or any later version" option.
        - speed up compression by ~10-15% in common cases
          by some manual unrolling.
        - import some compiler tricks from JSON::XS, for further speed-ups.
        - tune hash functions depending on ULTRA_FAST or VERY_FAST settings.
        - for typical binary data (e.g. /bin/bash, memory dumps,
          canterbury corpus etc.), speed is now comparable to fastlz, but
          with better compression ratio. with ULTRA_FAST, it's typically
          3-15% faster than fastlz while still maintaining a similar ratio.
          (amd64 and core 2 duo, ymmv). thanks a lot for the competition :)
        - undo inline assembly in compressor, it is no longer helpful.
        - no changes to the decompressor.
        - use a HLOG of 16 by default now (formerly 15).

2.1  Fri Nov  2 13:34:42 CET 2007
        - switched to a 2-clause bsd license with GPL exception.
        - get rid of memcpy.
        - tentatively use rep movsb on x86 and x86_64 (gcc only) for a
          moderate speed improvement.
        - applied patch by Kein-Hong Man to maske lzf.c compile under
          the crippled mingw32 environment.

2.0  Fri Feb 16 23:11:18 CET 2007
        - replaced lzf demo by industrial-strength lzf utility with behaviour
          similar other compression utilities. Thanks for Stefan Traby for
          rewriting it!
        - fix state arg prototype.

1.7  Wed Sep 27 17:29:15 CEST 2006
        - remove bogus "unlzf" patch.
          note to self: never accept well-meant patches.
        - make lzf more robust in presence of padding bytes or sudden eof.

1.6  Fri Jul  7 17:31:26 CEST 2006
        - the lzf example utility will now uncompress if invoked
          as "unlzf" (patch by Scott Feeney).
        - add CHECK_INPUT option that adds more checks for input
          data validity.
        - help applications that do not pass in the correct length
          (such as php) by returning either EINVAL or E2BIG.
        - default HLOG size is now 15 (cpu caches have increased).
        - documentation fixes.

1.51 Thu Apr 14 22:15:46 CEST 2005
        - incorporated C♯ implementation of both the en- and decoder,
          written by "Oren J. Maurice".
          You can find it in the cs/ subdirectory.
        - make FRST, NEXT IDX overridable if lzf_c.c is directly included
          in the code.

1.5  Tue Mar  8 20:23:23 CET 2005
        - incorporated improvements by Adam D. Moss,
          which includes a new VERY_FAST mode which is
          a bit slower than ULTRA_FAST but much better,
          and enabled it as default.

1.401 Thu Mar  3 18:00:52 CET 2005
        - use cstring in c++, not string.h.
        - change of contact address.

1.4  Wed Dec 15 08:08:49 CET 2004
        - very very slight tuning of the hashing function.

1.3  Thu Mar 25 15:41:17 CET 2004
        - changed license of lzf core code to explicitly allow
          relicensing under the GPLv2.
        - added VPATH support as suggested by Björn Eriksson.

1.2  Mon Dec 29 13:47:28 CET 2003
        - avoid spurious memory accesses after the to-be-compressed
          memory region. originally reported by Michal Zalewski.
        - flip LZF_STACK_ARG meaning (to be correct).

1.1  Tue Dec 23 05:48:32 CET 2003
        - removed #warn directive, it's not worth the hassle.
        - add LZF_STACK_ARG and AVOID_ERRNO configurations
          for embedded systems.
        - make it compile cleanly as c++.
        - some small documentation and code fixes.

1.0  Sun Nov 17 12:37:37 CET 2002
        - slightly better compression ratio, almost unmeasurably
          slower.
        - some documentation fixes.

0.4  Thu Jun 13 14:11:10 CEST 2002
        - typoe fix.
        - lzf demo program now properly decompresses small files.
        - fix another 64 bit issue, found by Laurent Deniel.

0.3  Tue Jan 16 13:21:14 CET 2001
        - fix silly beginners 32/64 bit mistake.

0.2  Thu Jan  4 05:56:42 CET 2001
        - now totally independent of autoconfig, for
          easy inclusion into other programs.
        - much better fine-tuning, faster and better than 0.1.

0.1  2000
        - initial release.
Revision:	1.47
Committed:	Mon Dec 14 02:05:14 2009 UTC (14 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.46:	+3 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.47
2			- fixed hash calculation in C♯ version (Tiago Freitas Leal).
3
4	root	1.46	3.5 Fri May 1 02:28:42 CEST 2009
5			- lzf_compress did sometimes write one octet past the given output
6			buffer (analyzed and nice testcase by Salvatore Sanfilippo).
7
8	root	1.44	3.4 Tue Sep 2 06:45:00 CEST 2008
9			- the fix from 3.3 introduced a compression bug, which is fixed in
10	root	1.45	this release (which explains the mysterious prerelease...). Thanks
11	root	1.44	once more to Clément Calmels.
12
13	root	1.43	3.3 Mon Aug 25 03:17:42 CEST 2008
14			- lzf_compress could access memory after the given input buffer
15			when outputting back references. reported with nice testcase
16			by Clément Calmels.
17	root	1.41
18	root	1.43	3.2 Fri May 9 18:52:23 CEST 2008
19	root	1.42	- include a workaround for failing POSIX and real-world compliance
20			on 64 bit windows (microsoft claims to support POSIX, but is far
21			from it). (bug found and analysed nicely by John Lilley).
22	root	1.41
23	root	1.39	3.1 Fri Nov 30 11:33:04 CET 2007
24			- IMPORTANT BUGFIX: a too long final literal run would corrupt data
25	root	1.40	in the encoder (this was introduced in 3.0 only, earlier versions
26			are safe).
27	root	1.39
28	root	1.38	3.0 Tue Nov 13 22:13:09 CET 2007
29	root	1.37	- switched to 2-clause bsd with "GPL v2 or any later version" option.
30	root	1.33	- speed up compression by ~10-15% in common cases
31			by some manual unrolling.
32	root	1.37	- import some compiler tricks from JSON::XS, for further speed-ups.
33	root	1.33	- tune hash functions depending on ULTRA_FAST or VERY_FAST settings.
34			- for typical binary data (e.g. /bin/bash, memory dumps,
35			canterbury corpus etc.), speed is now comparable to fastlz, but
36			with better compression ratio. with ULTRA_FAST, it's typically
37	root	1.34	3-15% faster than fastlz while still maintaining a similar ratio.
38			(amd64 and core 2 duo, ymmv). thanks a lot for the competition :)
39	root	1.37	- undo inline assembly in compressor, it is no longer helpful.
40	root	1.35	- no changes to the decompressor.
41	root	1.36	- use a HLOG of 16 by default now (formerly 15).
42	root	1.32
43	root	1.30	2.1 Fri Nov 2 13:34:42 CET 2007
44	root	1.31	- switched to a 2-clause bsd license with GPL exception.
45	root	1.28	- get rid of memcpy.
46			- tentatively use rep movsb on x86 and x86_64 (gcc only) for a
47			moderate speed improvement.
48	root	1.29	- applied patch by Kein-Hong Man to maske lzf.c compile under
49			the crippled mingw32 environment.
50	root	1.18
51	root	1.27	2.0 Fri Feb 16 23:11:18 CET 2007
52	root	1.24	- replaced lzf demo by industrial-strength lzf utility with behaviour
53			similar other compression utilities. Thanks for Stefan Traby for
54			rewriting it!
55	root	1.27	- fix state arg prototype.
56	root	1.23
57	root	1.22	1.7 Wed Sep 27 17:29:15 CEST 2006
58	root	1.26	- remove bogus "unlzf" patch.
59	root	1.20	note to self: never accept well-meant patches.
60	root	1.21	- make lzf more robust in presence of padding bytes or sudden eof.
61	root	1.20
62	root	1.18	1.6 Fri Jul 7 17:31:26 CEST 2006
63			- the lzf example utility will now uncompress if invoked
64			as "unlzf" (patch by Scott Feeney).
65			- add CHECK_INPUT option that adds more checks for input
66			data validity.
67			- help applications that do not pass in the correct length
68			(such as php) by returning either EINVAL or E2BIG.
69	root	1.19	- default HLOG size is now 15 (cpu caches have increased).
70			- documentation fixes.
71	root	1.18
72	root	1.16	1.51 Thu Apr 14 22:15:46 CEST 2005
73			- incorporated C♯ implementation of both the en- and decoder,
74	root	1.43	written by "Oren J. Maurice".
75	root	1.17	You can find it in the cs/ subdirectory.
76	root	1.16	- make FRST, NEXT IDX overridable if lzf_c.c is directly included
77			in the code.
78
79	root	1.15	1.5 Tue Mar 8 20:23:23 CET 2005
80			- incorporated improvements by Adam D. Moss,
81			which includes a new VERY_FAST mode which is
82			a bit slower than ULTRA_FAST but much better,
83			and enabled it as default.
84	root	1.12
85	root	1.13	1.401 Thu Mar 3 18:00:52 CET 2005
86	root	1.12	- use cstring in c++, not string.h.
87	root	1.14	- change of contact address.
88	root	1.12
89	root	1.11	1.4 Wed Dec 15 08:08:49 CET 2004
90	root	1.10	- very very slight tuning of the hashing function.
91
92	pcg	1.9	1.3 Thu Mar 25 15:41:17 CET 2004
93			- changed license of lzf core code to explicitly allow
94			relicensing under the GPLv2.
95	pcg	1.8	- added VPATH support as suggested by Björn Eriksson.
96
97	pcg	1.6	1.2 Mon Dec 29 13:47:28 CET 2003
98			- avoid spurious memory accesses after the to-be-compressed
99			memory region. originally reported by Michal Zalewski.
100	pcg	1.7	- flip LZF_STACK_ARG meaning (to be correct).
101	pcg	1.6
102	pcg	1.5	1.1 Tue Dec 23 05:48:32 CET 2003
103	pcg	1.4	- removed #warn directive, it's not worth the hassle.
104	pcg	1.5	- add LZF_STACK_ARG and AVOID_ERRNO configurations
105			for embedded systems.
106			- make it compile cleanly as c++.
107			- some small documentation and code fixes.
108	pcg	1.4
109	root	1.3	1.0 Sun Nov 17 12:37:37 CET 2002
110	root	1.2	- slightly better compression ratio, almost unmeasurably
111			slower.
112	root	1.3	- some documentation fixes.
113	root	1.2
114			0.4 Thu Jun 13 14:11:10 CEST 2002
115	root	1.1	- typoe fix.
116			- lzf demo program now properly decompresses small files.
117			- fix another 64 bit issue, found by Laurent Deniel.
118
119			0.3 Tue Jan 16 13:21:14 CET 2001
120			- fix silly beginners 32/64 bit mistake.
121
122			0.2 Thu Jan 4 05:56:42 CET 2001
123	root	1.3	- now totally independent of autoconfig, for
124	root	1.1	easy inclusion into other programs.
125			- much better fine-tuning, faster and better than 0.1.
126
127	root	1.3	0.1 2000
128	root	1.1	- initial release.