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@@ -0,0 +1,263 @@ +============================================================================ +User visible changes for LZO -- a real-time data compression library +============================================================================ + +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 |