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