1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
|
============================================================================
User visible changes for LZO -- a real-time data compression library
============================================================================
Changes in 2.07 (25 Jun 2014)
* Fixed a potential integer overflow condition in the "safe" decompressor
variants which could result in a possible buffer overrun when
processing maliciously crafted compressed input data.
As this issue only affects 32-bit systems and also can only happen if
you use uncommonly huge buffer sizes where you have to decompress more
than 16 MiB (2^24 bytes) compressed bytes within a single function call,
the practical implications are limited.
POTENTIAL SECURITY ISSUE.
* Removed support for ancient configurations like 16-bit "huge" pointers -
LZO now requires a flat 32-bit or 64-bit memory model.
* Assorted cleanups.
Changes in 2.06 (12 Aug 2011)
* Some minor optimizations for big-endian architectures.
* Fixed overly strict malloc() misalignment check in examples.
Changes in 2.05 (23 Apr 2011)
* Converted the configure system to non-recursive Automake.
* Applied some overdue speed optimizations for modern x86/x64 architectures
and current compilers like gcc 4.6 and MSVC 2010.
Changes in 2.04 (31 Oct 2010)
* Fixed a gcc-4.5 aliasing issue in lzo_init().
* Updated the configure system.
* Assorted cleanups.
Changes in 2.03 (30 Apr 2008)
* Updated the ELF assembler sources to mark the stack as non-executable.
* Fixed a HP-UX 11 build issue with Itanium in ILP32 mode.
* Updated the configure system.
Changes in 2.02 (17 Oct 2005)
* Updated the build and Autoconf scripts to fix some reported
compilation problems.
Changes in 2.01 (27 Jun 2005)
* Changed the configure system to install the LZO library under the
name "liblzo2" so that parallel installation with LZO v1 is possible.
* Improved auto-configuration in miniLZO for some embedded targets like
Blackfin and H8/300 processors.
Changes in 2.00 (30 May 2005)
[Library interface changes]
* The 'lzo_uint' typedef has been changed to match 'size_t', which means
it now is 64 bits on most 64-bit architectures. 32-bit machines
are not affected by this change.
* The formula for maximum expansion of incompressible data has changed.
See doc/LZO.FAQ. This is needed for some upcoming speed improvements,
and also for compatibility with our commercial LZO Professional product.
* The progress indicator callback interface has been revamped.
* All public header files now get installed into a "lzo" subdirectory, so
your applications should use #include <lzo/lzoXXX.h>.
* A number of (internal) macros have been renamed. See LZO_CFG_COMPAT
in <lzo/lzoconf.h> if your code depends on these.
[Speed]
* Small overall speedup by exploiting features like branch prediction
hints and explicit inline control present in modern C/C++ compilers.
* Significant speedup for 64-bit architectures like AMD64.
[Portability]
* LZO now fully supports the LLP64 programming model.
* LZO now fully supports the ILP64 and SILP64 programming models which
are used on some supercomputing architectures.
* Full Win64 support for AMD64 (aka x64) and IA64 (Itanium).
* Full 16-bit support for ancient DOS 286 protected mode, OS/2 1.x
and Windows 3.x.
* The LZO library now compiles and works on completely freestanding or
embedded systems as long as you have <limits.h> and <stddef.h> header
files. See the B/generic/build_freestanding.sh build script.
[Misc]
* The i386 assembler versions of the decompressors are now automatically
built and installed. See also asm/i386/00README.TXT.
* Added include file <lzo/lzo_asm.h> that provides prototypes for all
assembler functions.
* Under MacOS X, the configure script now will use the '-no-cpp-precomp'
compiler option in order to work around bugs in some versions of
Apple's native "smart" preprocessor.
* Worked around a preprocessor bug that is present in all compilers which
are based on the lcc compiler kit.
* Added simple B/generic/build.sh build script family.
* Added lots of new build scripts for various DOS/Windows compilers.
[Upgrade instructions from LZO v1 to LZO v2]
* On 64-bit architectures, revisit all uses of lzo_uint.
* Adapt for the maximum expansion change of incompressible data.
* If you use the progress callback then adapt for the new interface.
* Use #include <lzo/lzoXXX.h> or adjust your include path.
* Check your code for use of deprecated macros. Add a
#define LZO_CFG_COMPAT if necessary.
* Other than that LZO v2 should be fully source-compatible with LZO v1.
Of course, the compressed data is fully compatible as well.
* Re-compile and re-link your application.
* Enjoy the improvements!
----------------------------------------------------------------------------
Changes in 1.08 (12 Jul 2002)
* Much better support for cross compiling.
* Straighten out ANSI-conforming compiler checks.
* Avoid harmless compiler warnings reported by -Wcast-align.
* Fixed some sign extension problems on rather exotic machines where
sizeof(size_t) < sizeof(ptrdiff_t) and sizeof(lzo_uint) == sizeof(size_t)
* Updated the configure system to use the latest Autoconf, Automake
and Libtool versions.
Changes in 1.07 (18 Oct 2000)
* Default to '--disable-shared' (I'm getting tired of Libtool's
shared library build problems, this time AIX was the culprit).
* Avoid some harmless compiler warnings.
Changes in 1.06 (29 Nov 1999)
* Updated the configure system to use Autoconf 2.13, Automake 1.4 and
Libtool 1.3.3. This should hopefully fix the shared-library build
problems that were reported on some machines.
* Enhanced example programs a little bit.
Changes in 1.05 (14 Apr 1998)
* Just a one-line change in the configure script to workaround
a HPUX and IRIX build problem.
Changes in 1.04 (15 Mar 1998)
* Worked around a bug in the cpp preprocessor under HPUX 10.20.
* Adapted for Automake 1.2f and Libtool 1.1.
Changes in 1.03 (18 Jan 1998)
* minor compression ratio improvement
* extended example program to show how to do overlapping compression
* assembler changes, added support for the nasm assembler
* better support for cross compiling
* some cleanups
Changes in 1.02 (07 Dec 1997)
* improved LZO1X-999 and LZO1Y-999 compression ratio a little bit again
* introduced compression levels for LZO1X-999 and LZO1Y-999
* added support for preset dictionaries
* implemented LZO1X-1(12): needs 16 KiB for compression
* new algorithm LZO1Z: this is another variant of LZO1X
* added example program: how to use preset dictionaries
* added example program: how to do in-place decompression
* added a little file-packer example program
* LZO now works cleanly under checkergcc
* strict 16-bit memory model is working (but not officially supported)
* shared libraries are supported on many platforms
* adapted for Automake 1.2d and Libtool 1.0h
Changes in 1.01 (10 Aug 1997)
* improved LZO1X-999 and LZO1Y-999 compression ratio a little bit
* i386+gcc: significant speedup of the C version of the LZO1, LZO1A,
LZO1B and LZO1C decompressors
* added example programs that show how to generate pre-compressed data
* added Makefiles for DOS, Windows and OS/2 targets
Changes in 1.00 (13 Jul 1997)
* added miniLZO - can be easily included in your project
* improved documentation, added LZO.FAQ
* added build scripts for many systems where Autoconf is not available:
Windows 3.1 (LIB+DLL), Windows 95/NT (LIB+DLL), DOS (16+32 bit), OS/2
* adapted for Automake 1.2 and Libtool 1.0
Changes in 0.90 (27 Jun 1997): never released
* LZO now uses GNU Automake 1.0 - lots of configuration changes
* added LZO1X-1(11): this version needs only 8 KiB for compression
* implemented LZO1Y-1
* added i386 assembler decompressors for MASM/TASM/WASM
* the name of some assembler functions changed
* the numeric value of some error codes changed
* portability fixes
Changes in 0.29 (04 May 1997)
* Linux ELF shared library support
* workaround for gcc 2.7.2 optimizer bug under AIX
* added lzo_crc32() checksum
Changes in 0.28 (22 Feb 1997)
* new algorithm LZO1Y: LZO1Y-999 and LZO1Y decompressor
* added lzo1x_optimize() and lzo1y_optimize()
* minor speedup in assembler decompressors (i386+gcc)
* ltest.c rewritten
Changes in 0.27 (19 Jan 1997)
* fixed a bug in LZO1B-999 and LZO1C-999 that could produce
invalid compressed data in very rare cases
Changes in 0.26 (18 Jan 1997): never released
* implemented LZO1B-999
* renamed LZO1D to LZO2A (also updated all docs)
* some cleanups
Changes in 0.25 (28 Dec 1996): never released
* some portability fixes (LZO now works on my old Atari ST :-)
* adapted for Autoconf 2.12
Changes in 0.24 (30 Nov 1996): never released
* improved performance of LZO1X assembler decompressor on a Pentium (i386+gcc)
Changes in 0.23 (23 Nov 1996)
* added LZO1C, LZO1F and LZO1X decompressors in assembler (i386+gcc)
* added corresponding LZO_PUBLIC to all LZO_EXTERN functions
* added support for Microsoft C 7.0 (16-bit DOS)
* introduced lzo_uint32. This could prove useful for a strict 16-bit
version that doesn't use 'huge' pointers.
* all algorithms use incremental hashing now
* some cleanups and portability fixes
Changes in 0.22 (19 Sep 1996)
* LZO1X: minor decompressor speedup, added some checks in safe decompressor
* Autoconf: added detection of gcc strength-reduction bug
* Makefile changes
Changes in 0.21 (08 Sep 1996)
* LZO now uses GNU Autoconf 2.10 - lots of configuration changes
* a few cosmetical changes
Changes in 0.20 (11 Aug 1996)
* new algorithm LZO1X: LZO1X-1, LZO1X-999 and LZO1X decompressor
* significantly speeded up LZO1B, LZO1C and LZO1F decompressors
on CPUs which allow unaligned memory access (e.g. Intel i386)
* greatly speeded up LZO2A-999 compressor at the cost of some memory
* some cleanups, portability fixes and minor speedups
Changes in 0.16 (22 Jul 1996)
* speeded up LZO1F decompressor a little bit
* improved LZO1F-999 compression ratio
Changes in 0.15 (10 Jul 1996)
* new algorithm LZO1F: LZO1F-1, LZO1F-999 and LZO1F decompressor
* improved LZO2A-999 compression ratio
* removed LZO1E as it is dominated by LZO1F
Changes in 0.14 (06 Jul 1996): never released
* experimental algorithms: LZO1E and LZO1F
* added LZO_EXTERN to all prototypes. Useful when building a DLL.
* improved LZO1C-999 and LZO2A-999 compression ratio a little bit
* fixed progress indicator callback (it was called only once)
Changes in 0.13 (20 Jun 1996)
* some speed improvements in LZO1C-999 and LZO2A-999
Changes in 0.12 (18 Jun 1996): never released
* added LZO1C-999, a slow but nearly optimal compressor
intended for generating pre-compressed data
* added tests for lookbehind-overrun in all safe decompressors
* source tree completely rearranged, some filenames changed
* extensions changed: a .ch file is a C source code that is included
for reasons of code sharing
* new algorithm LZO2A: LZO2A-999 and LZO2A decompressor. There is
no fast compressor yet.
* some cleanups
Changes in 0.11 (29 May 1996)
* source tree rearranged
* LZO now compiles fine as a C++ library (interface still has C linkage)
* improved overall compression ratio a little bit
* LZO1B-99/LZO1C-99 now search for longer matches
* incremental hash is working, it's a little bit faster
* Makefile changed
* added lzo_uint and lzo_sizeof in some places
* split LZO1B compressor into even more include-files
Changes in 0.10 (20 May 1996): first public release of the LZO library
* includes LZO1, LZO1A, LZO1B and LZO1C algorithms
(compression levels 1-9 and 99)
14 Mar 1996:
* public release of the LZO1A algorithm
04 Mar 1996:
* public release of the LZO1 algorithm
|
