1 ============================================================================
2 User visible changes for LZO -- a real-time data compression library
3 ============================================================================
5 Changes in 2.09 (04 Feb 2015)
6 * Work around gcc bug #64516 that could affect architectures like
7 armv4, armv5 and sparc.
9 Changes in 2.08 (29 Jun 2014)
10 * Updated the Autoconf scripts to fix some reported build problems.
11 * Added CMake build support.
12 * Fixed lzo_init() on big-endian architectures like Sparc.
14 Changes in 2.07 (25 Jun 2014)
15 * Fixed a potential integer overflow condition in the "safe" decompressor
16 variants which could result in a possible buffer overrun when
17 processing maliciously crafted compressed input data.
19 Fortunately this issue only affects 32-bit systems and also can only happen
20 if you use uncommonly huge buffer sizes where you have to decompress more
21 than 16 MiB (> 2^24 bytes) untrusted compressed bytes within a single
22 function call, so the practical implications are limited.
24 POTENTIAL SECURITY ISSUE. CVE-2014-4607.
26 * Removed support for ancient configurations like 16-bit "huge" pointers -
27 LZO now requires a flat 32-bit or 64-bit memory model.
30 Changes in 2.06 (12 Aug 2011)
31 * Some minor optimizations for big-endian architectures.
32 * Fixed overly strict malloc() misalignment check in examples.
34 Changes in 2.05 (23 Apr 2011)
35 * Converted the configure system to non-recursive Automake.
36 * Applied some overdue speed optimizations for modern x86/x64 architectures
37 and current compilers like gcc 4.6 and MSVC 2010.
39 Changes in 2.04 (31 Oct 2010)
40 * Fixed a gcc-4.5 aliasing issue in lzo_init().
41 * Updated the configure system.
44 Changes in 2.03 (30 Apr 2008)
45 * Updated the ELF assembler sources to mark the stack as non-executable.
46 * Fixed a HP-UX 11 build issue with Itanium in ILP32 mode.
47 * Updated the configure system.
49 Changes in 2.02 (17 Oct 2005)
50 * Updated the build and Autoconf scripts to fix some reported
53 Changes in 2.01 (27 Jun 2005)
54 * Changed the configure system to install the LZO library under the
55 name "liblzo2" so that parallel installation with LZO v1 is possible.
56 * Improved auto-configuration in miniLZO for some embedded targets like
57 Blackfin and H8/300 processors.
59 Changes in 2.00 (30 May 2005)
61 [Library interface changes]
62 * The 'lzo_uint' typedef has been changed to match 'size_t', which means
63 it now is 64 bits on most 64-bit architectures. 32-bit machines
64 are not affected by this change.
65 * The formula for maximum expansion of incompressible data has changed.
66 See doc/LZO.FAQ. This is needed for some upcoming speed improvements,
67 and also for compatibility with our commercial LZO Professional product.
68 * The progress indicator callback interface has been revamped.
69 * All public header files now get installed into a "lzo" subdirectory, so
70 your applications should use #include <lzo/lzoXXX.h>.
71 * A number of (internal) macros have been renamed. See LZO_CFG_COMPAT
72 in <lzo/lzoconf.h> if your code depends on these.
75 * Small overall speedup by exploiting features like branch prediction
76 hints and explicit inline control present in modern C/C++ compilers.
77 * Significant speedup for 64-bit architectures like AMD64.
80 * LZO now fully supports the LLP64 programming model.
81 * LZO now fully supports the ILP64 and SILP64 programming models which
82 are used on some supercomputing architectures.
83 * Full Win64 support for AMD64 (aka x64) and IA64 (Itanium).
84 * Full 16-bit support for ancient DOS 286 protected mode, OS/2 1.x
86 * The LZO library now compiles and works on completely freestanding or
87 embedded systems as long as you have <limits.h> and <stddef.h> header
88 files. See the B/generic/build_freestanding.sh build script.
91 * The i386 assembler versions of the decompressors are now automatically
92 built and installed. See also asm/i386/00README.TXT.
93 * Added include file <lzo/lzo_asm.h> that provides prototypes for all
95 * Under MacOS X, the configure script now will use the '-no-cpp-precomp'
96 compiler option in order to work around bugs in some versions of
97 Apple's native "smart" preprocessor.
98 * Worked around a preprocessor bug that is present in all compilers which
99 are based on the lcc compiler kit.
100 * Added simple B/generic/build.sh build script family.
101 * Added lots of new build scripts for various DOS/Windows compilers.
103 [Upgrade instructions from LZO v1 to LZO v2]
104 * On 64-bit architectures, revisit all uses of lzo_uint.
105 * Adapt for the maximum expansion change of incompressible data.
106 * If you use the progress callback then adapt for the new interface.
107 * Use #include <lzo/lzoXXX.h> or adjust your include path.
108 * Check your code for use of deprecated macros. Add a
109 #define LZO_CFG_COMPAT if necessary.
110 * Other than that LZO v2 should be fully source-compatible with LZO v1.
111 Of course, the compressed data is fully compatible as well.
112 * Re-compile and re-link your application.
113 * Enjoy the improvements!
115 ----------------------------------------------------------------------------
117 Changes in 1.08 (12 Jul 2002)
118 * Much better support for cross compiling.
119 * Straighten out ANSI-conforming compiler checks.
120 * Avoid harmless compiler warnings reported by -Wcast-align.
121 * Fixed some sign extension problems on rather exotic machines where
122 sizeof(size_t) < sizeof(ptrdiff_t) and sizeof(lzo_uint) == sizeof(size_t)
123 * Updated the configure system to use the latest Autoconf, Automake
124 and Libtool versions.
126 Changes in 1.07 (18 Oct 2000)
127 * Default to '--disable-shared' (I'm getting tired of Libtool's
128 shared library build problems, this time AIX was the culprit).
129 * Avoid some harmless compiler warnings.
131 Changes in 1.06 (29 Nov 1999)
132 * Updated the configure system to use Autoconf 2.13, Automake 1.4 and
133 Libtool 1.3.3. This should hopefully fix the shared-library build
134 problems that were reported on some machines.
135 * Enhanced example programs a little bit.
137 Changes in 1.05 (14 Apr 1998)
138 * Just a one-line change in the configure script to workaround
139 a HPUX and IRIX build problem.
141 Changes in 1.04 (15 Mar 1998)
142 * Worked around a bug in the cpp preprocessor under HPUX 10.20.
143 * Adapted for Automake 1.2f and Libtool 1.1.
145 Changes in 1.03 (18 Jan 1998)
146 * minor compression ratio improvement
147 * extended example program to show how to do overlapping compression
148 * assembler changes, added support for the nasm assembler
149 * better support for cross compiling
152 Changes in 1.02 (07 Dec 1997)
153 * improved LZO1X-999 and LZO1Y-999 compression ratio a little bit again
154 * introduced compression levels for LZO1X-999 and LZO1Y-999
155 * added support for preset dictionaries
156 * implemented LZO1X-1(12): needs 16 KiB for compression
157 * new algorithm LZO1Z: this is another variant of LZO1X
158 * added example program: how to use preset dictionaries
159 * added example program: how to do in-place decompression
160 * added a little file-packer example program
161 * LZO now works cleanly under checkergcc
162 * strict 16-bit memory model is working (but not officially supported)
163 * shared libraries are supported on many platforms
164 * adapted for Automake 1.2d and Libtool 1.0h
166 Changes in 1.01 (10 Aug 1997)
167 * improved LZO1X-999 and LZO1Y-999 compression ratio a little bit
168 * i386+gcc: significant speedup of the C version of the LZO1, LZO1A,
169 LZO1B and LZO1C decompressors
170 * added example programs that show how to generate pre-compressed data
171 * added Makefiles for DOS, Windows and OS/2 targets
173 Changes in 1.00 (13 Jul 1997)
174 * added miniLZO - can be easily included in your project
175 * improved documentation, added LZO.FAQ
176 * added build scripts for many systems where Autoconf is not available:
177 Windows 3.1 (LIB+DLL), Windows 95/NT (LIB+DLL), DOS (16+32 bit), OS/2
178 * adapted for Automake 1.2 and Libtool 1.0
180 Changes in 0.90 (27 Jun 1997): never released
181 * LZO now uses GNU Automake 1.0 - lots of configuration changes
182 * added LZO1X-1(11): this version needs only 8 KiB for compression
183 * implemented LZO1Y-1
184 * added i386 assembler decompressors for MASM/TASM/WASM
185 * the name of some assembler functions changed
186 * the numeric value of some error codes changed
189 Changes in 0.29 (04 May 1997)
190 * Linux ELF shared library support
191 * workaround for gcc 2.7.2 optimizer bug under AIX
192 * added lzo_crc32() checksum
194 Changes in 0.28 (22 Feb 1997)
195 * new algorithm LZO1Y: LZO1Y-999 and LZO1Y decompressor
196 * added lzo1x_optimize() and lzo1y_optimize()
197 * minor speedup in assembler decompressors (i386+gcc)
200 Changes in 0.27 (19 Jan 1997)
201 * fixed a bug in LZO1B-999 and LZO1C-999 that could produce
202 invalid compressed data in very rare cases
204 Changes in 0.26 (18 Jan 1997): never released
205 * implemented LZO1B-999
206 * renamed LZO1D to LZO2A (also updated all docs)
209 Changes in 0.25 (28 Dec 1996): never released
210 * some portability fixes (LZO now works on my old Atari ST :-)
211 * adapted for Autoconf 2.12
213 Changes in 0.24 (30 Nov 1996): never released
214 * improved performance of LZO1X assembler decompressor on a Pentium (i386+gcc)
216 Changes in 0.23 (23 Nov 1996)
217 * added LZO1C, LZO1F and LZO1X decompressors in assembler (i386+gcc)
218 * added corresponding LZO_PUBLIC to all LZO_EXTERN functions
219 * added support for Microsoft C 7.0 (16-bit DOS)
220 * introduced lzo_uint32. This could prove useful for a strict 16-bit
221 version that doesn't use 'huge' pointers.
222 * all algorithms use incremental hashing now
223 * some cleanups and portability fixes
225 Changes in 0.22 (19 Sep 1996)
226 * LZO1X: minor decompressor speedup, added some checks in safe decompressor
227 * Autoconf: added detection of gcc strength-reduction bug
230 Changes in 0.21 (08 Sep 1996)
231 * LZO now uses GNU Autoconf 2.10 - lots of configuration changes
232 * a few cosmetical changes
234 Changes in 0.20 (11 Aug 1996)
235 * new algorithm LZO1X: LZO1X-1, LZO1X-999 and LZO1X decompressor
236 * significantly speeded up LZO1B, LZO1C and LZO1F decompressors
237 on CPUs which allow unaligned memory access (e.g. Intel i386)
238 * greatly speeded up LZO2A-999 compressor at the cost of some memory
239 * some cleanups, portability fixes and minor speedups
241 Changes in 0.16 (22 Jul 1996)
242 * speeded up LZO1F decompressor a little bit
243 * improved LZO1F-999 compression ratio
245 Changes in 0.15 (10 Jul 1996)
246 * new algorithm LZO1F: LZO1F-1, LZO1F-999 and LZO1F decompressor
247 * improved LZO2A-999 compression ratio
248 * removed LZO1E as it is dominated by LZO1F
250 Changes in 0.14 (06 Jul 1996): never released
251 * experimental algorithms: LZO1E and LZO1F
252 * added LZO_EXTERN to all prototypes. Useful when building a DLL.
253 * improved LZO1C-999 and LZO2A-999 compression ratio a little bit
254 * fixed progress indicator callback (it was called only once)
256 Changes in 0.13 (20 Jun 1996)
257 * some speed improvements in LZO1C-999 and LZO2A-999
259 Changes in 0.12 (18 Jun 1996): never released
260 * added LZO1C-999, a slow but nearly optimal compressor
261 intended for generating pre-compressed data
262 * added tests for lookbehind-overrun in all safe decompressors
263 * source tree completely rearranged, some filenames changed
264 * extensions changed: a .ch file is a C source code that is included
265 for reasons of code sharing
266 * new algorithm LZO2A: LZO2A-999 and LZO2A decompressor. There is
267 no fast compressor yet.
270 Changes in 0.11 (29 May 1996)
271 * source tree rearranged
272 * LZO now compiles fine as a C++ library (interface still has C linkage)
273 * improved overall compression ratio a little bit
274 * LZO1B-99/LZO1C-99 now search for longer matches
275 * incremental hash is working, it's a little bit faster
277 * added lzo_uint and lzo_sizeof in some places
278 * split LZO1B compressor into even more include-files
280 Changes in 0.10 (20 May 1996): first public release of the LZO library
281 * includes LZO1, LZO1A, LZO1B and LZO1C algorithms
282 (compression levels 1-9 and 99)
285 * public release of the LZO1A algorithm
288 * public release of the LZO1 algorithm