60 lines
3 KiB
Text
60 lines
3 KiB
Text
Description
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Pdlzip is a permissively licensed implementation of the lzip data
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compressor, intended for those who can't distribute (or even use) GPL
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licensed Free Software. The name of pdlzip comes from 'public domain lzip'.
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Pdlzip is written in C.
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Lzip is a lossless data compressor with a user interface similar to the one
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of gzip or bzip2. Lzip uses a simplified form of LZMA (Lempel-Ziv-Markov
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chain-Algorithm) designed to achieve complete interoperability between
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implementations. The maximum dictionary size is 512 MiB so that any lzip
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file can be decompressed on 32-bit machines. Lzip provides accurate and
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robust 3-factor integrity checking. 'lzip -0' compresses about as fast as
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gzip, while 'lzip -9' compresses most files more than bzip2. Decompression
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speed is intermediate between gzip and bzip2. Lzip provides better data
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recovery capabilities than gzip and bzip2. Lzip has been designed, written,
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and tested with great care to replace gzip and bzip2 as general-purpose
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compressed format for Unix-like systems.
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The lzip file format is designed for data sharing and long-term archiving,
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taking into account both data integrity and decoder availability:
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* The lzip format provides very safe integrity checking and some data
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recovery means. The program lziprecover can repair bit flip errors
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(one of the most common forms of data corruption) in lzip files, and
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provides data recovery capabilities, including error-checked merging
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of damaged copies of a file.
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* The lzip format is as simple as possible (but not simpler). The lzip
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manual provides the source code of a simple decompressor along with a
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detailed explanation of how it works, so that with the only help of the
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lzip manual it would be possible for a digital archaeologist to extract
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the data from a lzip file long after quantum computers eventually
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render LZMA obsolete.
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* Additionally the lzip reference implementation is copylefted, which
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guarantees that it will remain free forever.
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A nice feature of the lzip format is that a corrupt byte is easier to repair
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the nearer it is from the beginning of the file. Therefore, with the help of
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lziprecover, losing an entire archive just because of a corrupt byte near
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the beginning is a thing of the past.
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Pdlzip is also able to decompress legacy lzma-alone (.lzma) files.
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Lzma-alone is a very bad format; it is essentially a raw LZMA stream.
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If you keep any lzma-alone files, it is advisable to recompress them to
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lzip format. Lziprecover can convert some lzma-alone files to lzip format
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without recompressing.
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Pdlzip includes public domain compression/decompression code from the LZMA
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SDK (Software Development Kit) written by Igor Pavlov.
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Copyright (C) 2010-2024 Antonio Diaz Diaz.
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This file is free documentation: you have unlimited permission to copy,
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distribute, and modify it.
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The file Makefile.in is a data file used by configure to produce the Makefile.
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It has the same copyright owner and permissions that configure itself.
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