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1997-07-13
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============================================================================
User visible changes for LZO -- a real-time data compression library
============================================================================
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 8kB 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)
* lzo_test.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
* LZO is now distributed under the GNU General Public License (GPL)
* 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 Pentium performance of LZO1X assembler decompressor (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 MSDOS)
* 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
* added 'official' LZO benchmark (see util/bench.sh)
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 80x86)
* 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
* removed contrib directory
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)
* LZO2A compressed data format changed from v0.12
* some speed improvements in LZO1C-999 and LZO2A-999
Changes in 0.12 (18 Jun 1996): never released
* added standalone version of LZO1C-1 compressor and LZO1C decompressor
in the ./extra directory for easy inclusion in applications
* 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 (MATCH_IP_END)
* LZO_HASH_LZO_INCREMENTAL is working, it's a little bit faster
* added unused_dict_entries in statistics
* Makefile changed
* fixed a typo in COPY_M2X
* 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:
* release of the LZO1A algorithm in the Internet newsgroups
comp.compression and comp.compression.research
04 Mar 1996:
* release of the LZO1 algorithm in the Internet newsgroups
comp.compression and comp.compression.research