Lzip A data compressor based on the LZMA algorithm.
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algorithm lossless LZMA data compressor LZMA algorithm lossless compression

Lzip Description

A data compressor based on the LZMA algorithm. Lzip is a lossless data compressor based on the LZMA algorithm, with very safe integrity checking and a user interface almost identical to the one of bzip2.Lzip decompresses almost as fast as gzip and compresses better than bzip2, which makes it well suited for software distribution.Lzip is a lossless file compressor based on the LZMA (Lempel-Ziv-Markov chain-Algorithm) algorithm designed by Igor Pavlov. The high compression of LZMA comes from combining two basic, well-proven compression ideas: sliding dictionaries (i.e. LZ77/78), and markov models (i.e. the thing used by every compression algorithm that uses a range encoder or similar order-0 entropy coder as its last stage) with segregation of contexts according to what the bits are used for.Lzip is not a replacement for gzip or bzip2, but a complement; which one is best to use depends on user's needs. Gzip is the fastest and most widely used. Bzip2 compresses better than gzip but is slower, both compressing and decompressing. Lzip decompresses almost as fast as gzip and compresses better than bzip2, but requires more memory and time during compression. These features make lzip well suited for software distribution and data archival.The amount of memory required for compression is about 6 times the dictionary size, for decompression is a little more than dictionary size. It is also important to appreciate that the decompression memory requirement is set at compression time by the choice of dictionary size.Lzip has a user interface similar to the one of gzip or bzip2. It replaces every file given in the command line with a compressed version of itself, with the name "original_name.lz". Each compressed file has the same modification date, permissions, and, when possible, ownership as the corresponding original, so that these properties can be correctly restored at decompression time.If no file names are specified, lzip compresses (or decompresses) from standard input to standard output. In this case, lzip will decline to write compressed output to a terminal, as this would be entirely incomprehensible and therefore pointless.Lzip will correctly decompress a file which is the concatenation of two or more compressed files. The result is the concatenation of the corresponding uncompressed files. Integrity testing of concatenated compressed files is also supported.As a self-check for your protection, lzip stores in the file trailer the 32-bit CRC of the original file and the size of the original file, to make sure that the decompressed version of the file is identical to the original. This guards against corruption of the compressed data, and against undetected bugs in lzip (hopefully very unlikely). The chances of data corruption going undetected are microscopic, less than one chance in 4000 million for each file processed. Be aware, though, that the check occurs upon decompression, so it can only tell you that something is wrong. It can't help you recover the original uncompressed data. Requirements: · Arg_parser What's New in This Release: · Compression time has been reduced by 4%. · Lzdiff and lzgrep have been renamed to zdiff and zgrep and moved to the zutils package. · Compilation warnings on systems where uint32_t is not the same as unsigned int have been fixed.

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