1============================================================================ 2User visible changes for LZO -- a real-time data compression library 3============================================================================ 4 5Changes 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. 9 10Changes in 2.02 (17 Oct 2005) 11 * Updated the build and Autoconf scripts to fix some reported 12 compilation problems. 13 14Changes 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. 19 20Changes in 2.00 (30 May 2005) 21 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. 34 35 [Speed] 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. 39 40 [Portability] 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 46 and Windows 3.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. 50 51 [Misc] 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 55 assembler functions. 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. 63 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! 75 76---------------------------------------------------------------------------- 77 78Changes 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 85 and Libtool versions. 86 87Changes 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. 91 92Changes 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. 97 98Changes 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. 101 102Changes 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. 105 106Changes 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 111 * some cleanups 112 113Changes 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 126 127Changes 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 133 134Changes 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 1.0 140 141Changes 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 148 * portability fixes 149 150Changes 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 154 155Changes 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) 159 * ltest.c rewritten 160 161Changes 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 164 165Changes in 0.26 (18 Jan 1997): never released 166 * implemented LZO1B-999 167 * renamed LZO1D to LZO2A (also updated all docs) 168 * some cleanups 169 170Changes in 0.25 (28 Dec 1996): never released 171 * some portability fixes (LZO now works on my old Atari ST :-) 172 * adapted for Autoconf 2.12 173 174Changes in 0.24 (30 Nov 1996): never released 175 * improved performance of LZO1X assembler decompressor on a Pentium (i386+gcc) 176 177Changes 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 185 186Changes 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 189 * Makefile changes 190 191Changes in 0.21 (08 Sep 1996) 192 * LZO now uses GNU Autoconf 2.10 - lots of configuration changes 193 * a few cosmetical changes 194 195Changes 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 201 202Changes in 0.16 (22 Jul 1996) 203 * speeded up LZO1F decompressor a little bit 204 * improved LZO1F-999 compression ratio 205 206Changes 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 210 211Changes 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) 216 217Changes in 0.13 (20 Jun 1996) 218 * some speed improvements in LZO1C-999 and LZO2A-999 219 220Changes 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. 229 * some cleanups 230 231Changes 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 237 * Makefile changed 238 * added lzo_uint and lzo_sizeof in some places 239 * split LZO1B compressor into even more include-files 240 241Changes 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) 244 24514 Mar 1996: 246 * public release of the LZO1A algorithm 247 24804 Mar 1996: 249 * public release of the LZO1 algorithm 250