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Diffstat (limited to 'README')
| -rw-r--r-- | README | 27 |
1 files changed, 14 insertions, 13 deletions
@@ -3,7 +3,7 @@ Description Lzip is a lossless data compressor with a user interface similar to the one of gzip or bzip2. Lzip is about as fast as gzip, compresses most files more than bzip2, and is better than both from a data recovery -perspective. Lzip is a clean implementation of the LZMA "algorithm". +perspective. The lzip file format is designed for data sharing and long-term archiving, taking into account both data integrity and decoder @@ -76,18 +76,19 @@ multivolume compressed tar archives. Lzip is able to compress and decompress streams of unlimited size by automatically creating multi-member output. The members so created are -large, about 64 PiB each. - -There is no such thing as a "LZMA algorithm"; it is more like a "LZMA -coding scheme". For example, the option '-0' of lzip uses the scheme in -almost the simplest way possible; issuing the longest match it can find, -or a literal byte if it can't find a match. Inversely, a much more -elaborated way of finding coding sequences of minimum size than the one -currently used by lzip could be developed, and the resulting sequence -could also be coded using the LZMA coding scheme. - -Lzip currently implements two variants of the LZMA algorithm; fast (used -by option -0) and normal (used by all other compression levels). +large, about 2 PiB each. + +In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not a +concrete algorithm; it is more like "any algorithm using the LZMA coding +scheme". For example, the option '-0' of lzip uses the scheme in almost +the simplest way possible; issuing the longest match it can find, or a +literal byte if it can't find a match. Inversely, a much more elaborated +way of finding coding sequences of minimum size than the one currently +used by lzip could be developed, and the resulting sequence could also +be coded using the LZMA coding scheme. + +Lzip currently implements two variants of the LZMA algorithm; fast +(used by option -0) and normal (used by all other compression levels). The high compression of LZMA comes from combining two basic, well-proven compression ideas: sliding dictionaries (LZ77/78) and markov models (the |