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Ruby bindings for LZ4 (Extremely Fast Compression algorithm)
Ruby C Java Shell
branch: master

README.rdoc

lz4-ruby

Ruby bindings for LZ4.

Installation

gem install lz4-ruby

Usage

require 'rubygems'
require 'lz4-ruby'

# compress (fast)
compressed = LZ4::compress("hello, world")

# compress (high compression)
compressed = LZ4::compressHC("hello, world")

# uncompress
uncompressed = LZ4::uncompress(compressed)

Benchmark

Tested on VirtualBox VM : 2-core / 4GB RAM (Host : Core i5-2520M / 8GB RAM).

enwik8

method  ratio(bpc)      comp.time(ms)   uncomp.time(ms)
-------------------------------------------------------
lz4     4.559           519.25          182.67
snappy  4.668           1050.73         257.94
lzo     4.279           1000.13         574.77

TODO

  • Support streaming methods.

  • Support compression level (LZ4HC)

  • Write API documents.

Copyright

Copyright © 2012 KOMIYA Atsushi. See LICENSE.txt for further details.

Contributors

About LZ4

This Rubygem includes LZ4 codes written by Yann Collet.

LZ4 - Fast LZ compression algorithm
Copyright (C) 2011-2012, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

You can contact the author at :
- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
- LZ4 source repository : http://code.google.com/p/lz4/
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