lzip/lziprecover
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Adding upstream version 1.15~rc1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-21 11:17:33 +01:00
parent 0ff20a5602
commit 6a117924f6
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
20 changed files with 439 additions and 219 deletions
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README
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Description
Lziprecover is a data recovery tool and decompressor for files in the
lzip compressed data format (.lz) able to repair slightly damaged files,
recover badly damaged files from two or more copies, extract data from
damaged files, decompress files and test integrity of files.
lzip compressed data format (.lz), able to repair slightly damaged
files, recover badly damaged files from two or more copies, extract data
from damaged files, decompress files and test integrity of files.
The lzip file format is designed for long-term data archiving. It is
clean, provides very safe 4 factor integrity checking, and is backed by
the recovery capabilities of lziprecover.
Lziprecover is able to recover or decompress files produced by any of
the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
and pdlzip. It makes lzip files resistant to bit-flip, one of the most
common forms of data corruption, and its recovery capabilities
contribute to make of the lzip format one of the best options for
long-term data archiving.
and pdlzip.
Lziprecover makes lzip files resistant to bit-flip (one of the most
common forms of data corruption), and can safely merge multiple damaged
backup copies.
If the cause of file corruption is damaged media, the combination
GNU ddrescue + lziprecover is the best option for recovering data from
multiple damaged copies.
If a file is too damaged for lziprecover to repair it, all the
recoverable data in all members of the file can be extracted with the
'-D' option.
Lziprecover is able to efficiently extract a range of bytes from a
multi-member file, because it only decompresses the members containing
@ -27,24 +40,20 @@ damaged files themselves are never modified.
When decompressing or testing file integrity, lziprecover behaves like
lzip or lunzip.
If the files are too damaged for lziprecover to repair them, data from
damaged members can be partially recovered writing it to stdout.
To give you an idea of its possibilities, when merging two copies each
To give you an idea of its possibilities, when merging two copies, each
of them with one damaged area affecting 1 percent of the copy, the
probability of obtaining a correct file is about 98 percent. With three
such copies the probability rises to 99.97 percent. For large files with
small errors, the probability approaches 100 percent even with only two
copies.
such copies the probability rises to 99.97 percent. For large files (a
few MB) with small errors (one sector damaged per copy), the probability
approaches 100 percent even with only two copies.
If the cause of file corruption is damaged media, the combination
GNU ddrescue + lziprecover is the best option for recovering data from
multiple damaged copies.
Lziprecover is not a replacement for regular backups, but a last line of
defense for the case where the backups are also damaged.
This package also includes unzcrash, a program written to test
robustness to decompression of corrupted data, inspired by unzcrash.c
from Julian Seward's bzip2. Type 'make unzcrash' in the lziprecover
directory to build it. Then try 'unzcrash --help'.
The lziprecover package also includes unzcrash, a program written to
test robustness to decompression of corrupted data, inspired by
unzcrash.c from Julian Seward's bzip2. Type 'make unzcrash' in the
lziprecover source directory to build it. Then try 'unzcrash --help'.
Copyright (C) 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz.