57 lines
2.4 KiB
Text
57 lines
2.4 KiB
Text
Description
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Lziprecover is a data recovery tool and decompressor for files in the
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lzip compressed data format (.lz) able to repair slightly damaged files,
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recover badly damaged files from two or more copies, extract data from
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damaged files, decompress files and test integrity of files.
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Lziprecover is able to recover or decompress files produced by any of
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the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
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and pdlzip. It makes lzip files resistant to bit-flip, one of the most
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common forms of data corruption, and its recovery capabilities
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contribute to make of the lzip format one of the best options for
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long-term data archiving.
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Lziprecover is able to efficiently extract a range of bytes from a
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multi-member file, because it only decompresses the members containing
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the desired data.
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Lziprecover can print correct total file sizes and ratios even for
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multi-member files.
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When recovering data, lziprecover takes as arguments the names of the
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damaged files and writes zero or more recovered files depending on the
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operation selected and whether the recovery succeeded or not. The
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damaged files themselves are never modified.
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When decompressing or testing file integrity, lziprecover behaves like
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lzip or lunzip.
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If the files are too damaged for lziprecover to repair them, data from
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damaged members can be partially recovered writing it to stdout.
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To give you an idea of its possibilities, when merging two copies each
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of them with one damaged area affecting 1 percent of the copy, the
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probability of obtaining a correct file is about 98 percent. With three
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such copies the probability rises to 99.97 percent. For large files with
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small errors, the probability approaches 100 percent even with only two
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copies.
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If the cause of file corruption is damaged media, the combination
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GNU ddrescue + lziprecover is the best option for recovering data from
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multiple damaged copies.
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This package also includes unzcrash, a program written to test
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robustness to decompression of corrupted data, inspired by unzcrash.c
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from Julian Seward's bzip2. Type 'make unzcrash' in the lziprecover
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directory to build it. Then try 'unzcrash --help'.
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Copyright (C) 2009, 2010, 2011, 2012, 2013 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
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Makefile. It has the same copyright owner and permissions that configure
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itself.
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