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============================================================================ 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