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authorArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
committerArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
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+============================================================================
+User visible changes for LZO -- a real-time data compression library
+============================================================================
+
+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 kB 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 kB 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