- LZO 2.00 is scheduled for early 2005, including full support
for LLP64 programming models (Win64), .NET bindings,
and lots of other improvements.
- LZO 2.00 will be accompanied by our stunning new
LZO Professional
product - if you feel that LZO has a an incredible performance
right now we know that you will stay tuned...
- LZO implements the fastest compression and decompression algorithms
around. See the ratings for lzop in the famous
Archive Comparison
Test .
- 29 Aug 2002: Perl-LZO
1.08 has been released (12 kB).
- 17 Jul 2002: Python-LZO
1.08 has been released (13 kB).
- 12 Jul 2002: LZO 1.08 has
been released.
- 01 Dec 1999: Java-LZO
1.00 has been released (36 kB).
- LZO is a portable lossless data compression library written in
ANSI C.
- Offers pretty fast compression and *extremly* fast decompression.
[Screenshot]
- Includes slower compression levels achieving a quite
competitive compression ratio while still decompressing at this very
high speed.
- Distributed under the terms of the
GNU General Public License (GPL).
Commercial licenses are available on request.
- Military-grade stability and robustness.
-
LZO is a data compression library which is suitable for data
de-/compression in real-time. This means it favours speed over
compression ratio.
-
LZO is written in ANSI C. Both the source code and the compressed
data format are designed to be portable across platforms.
-
LZO implements a number of algorithms with the following
features:
- Decompression is simple and *very* fast.
- Requires no memory for decompression.
- Compression is pretty fast.
- Requires 64 kB of memory for compression.
- Allows you to dial up extra compression at a speed cost in the
compressor. The speed of the decompressor is not reduced.
- Includes compression levels for generating pre-compressed data
which achieve a quite competitive compression ratio.
- There is also a compression level which needs only 8 kB for
compression.
- Algorithm is thread safe.
- Algorithm is lossless.
-
LZO supports overlapping compression and in-place
decompression.
-
LZO and the LZO algorithms and implementations are distributed
under the terms of the GNU General Public License
(GPL)
. Special licenses
for commercial and other applications are available by contacting the
author.
-
Here are some original timings done on an Intel Pentium 133.
Multiply by a constant factor for modern machines.
-
- memcpy(): ~60 MB/sec
- LZO1X decompression in C: ~16 MB/sec
- LZO1X decompression in optimized assembler: ~20 MB/sec
- LZO1X-1 compression: ~5 MB/sec
-
More detailed results can be found in the documentation.
-
LZO has been successfully built and tested on a variety of platforms
including DOS (16 + 32 bit), Windows 3.x (16-bit), Windows
95/98/ME/NT/2000/XP/2003, Linux, HPUX and a DEC Alpha (64-bit).
-
LZO is also reported to work under AIX, AmigaOS, ConvexOS, CrayOS,
Dreamcast, FreeBSD, IRIX, Mac Classic, MacOSX, MiNT, NetBSD,
Nintendo64, OpenBSD, PalmOS (Pilot), PSX, PS2, OpenBSD, OS/400, QNX,
Solaris, SunOS, TOS, WinCE, VMS, VxWorks and XBOX.
-
And finally it would be much fun to translate the
decompressors to ancient CPUs like Z-80 or 6502
assembly.
-
miniLZO is a lightweight subset of the LZO library.
-
We've created miniLZO for projects where it is inconvenient to
include or require the full LZO source code just because you want to
add a little bit of data compression to your application.
-
miniLZO implements the LZO1X-1 compressor and both the standard
and safe LZO1X decompressor. Apart from fast compression it also
useful for situations where you want to use pre-compressed data files
(which must have been compressed with LZO1X-999).
-
miniLZO consists of one C source file and two header files. It
compiles to less than 5 kB (on an i386), and the sources are about 14 kB
when packed - so there's no more excuse that your application doesn't
support data compression :-)
-
Download miniLZO (26
kB).
-
lzop is a file compressor which uses LZO
for compression services. It is very similar to
gzip - its main advantages over gzip are much
higher compression and decompression speed.
- LZO Professional
(scheduled for Q2 2005).
- The NRV compression library is the flagship
of our compression products, featuring unrivaled space-grade
technology.
- The UCL compression library focuses on
generating pre-compressed data while still providing very fast
decompression without additional memory requirements. UCL is a
OpenSource re-implementation of some NRV compression algorithms.
- If you need better compression you should take a look at the
excellent zlib library. zlib is slower and needs
more memory, though.
- For even better compression consider using libbzip2 which is
distributed with the bzip2 file
compressor.
- The FAQ of
the newsgroup comp.compression is
an invaluable source of infomation related to data compression.
|
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Space-Grade Technology
oberhumer.com has designed and implemented
the on-board lossless data compression module of the
NASA Mars Exploration Rovers,
better known under the names
Spirit and
Opportunity.
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