bzip2
bzip2 is a freely available, patent free, high-quality data
compressor.
This utility typically compresses files to within 10% to 15%
of the best available techniques, whilst being around twice as fast at
compression and six
times faster at decompression.
bzip2 compresses files using the Burrows-Wheeler block-sorting text
compression algorithm, and Huffman coding. Compression is
generally considerably better than that achieved by more conventional
LZ77/LZ78-based compressors, and approaches the performance of the PPM
family of statistical compressors.
The archive file format of bzip2 (.bz2) is incompatible with that of
its predecessor, bzip (.bz).
bzip2 is built on top of libbzip2, a flexible library for
handling compressed data in the bzip2 format.
Features include:
- Uses several layers of compression techniques:
- Run-length encoding
- Burrows-Wheeler transform
- Run-length encoding
- Huffman coding
- Multiple Huffman tables
- Unary base 1 encoding
- Delta encoding
- Sparse bit array
- Move to front
- Supports (limited) recovery from media errors
- Very portable
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Last Updated Sunday, February 05 2012 @ 12:01 PM EST
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