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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
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