lzip/lziprecover
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Adding upstream version 1.17~pre1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-21 11:23:10 +01:00
parent 15503a1dcd
commit c230441360
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
17 changed files with 419 additions and 186 deletions
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17
README
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@ -2,11 +2,13 @@ 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.
files, produce a correct file by merging the good parts of two or more
damaged copies, extract data from damaged files, decompress files and
test integrity of files.
The lzip file format is designed for long-term data archiving, taking
into account both data integrity and decoder availability:
The lzip file format is designed for data sharing and long-term
archiving, taking into account both data integrity and decoder
availability:
* The lzip format provides very safe integrity checking and some data
recovery means. The lziprecover program can repair bit-flip errors
@ -21,8 +23,8 @@ into account both data integrity and decoder availability:
extract the data from a lzip file long after quantum computers
eventually render LZMA obsolete.
* Additionally lzip is copylefted, which guarantees that it will
remain free forever.
* Additionally the lzip reference implementation is copylefted, which
guarantees that it will remain free forever.
A nice feature of the lzip format is that a corrupt byte is easier to
repair the nearer it is from the beginning of the file. Therefore, with
@ -61,7 +63,8 @@ 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 (a
few MB) with small errors (one sector damaged per copy), the probability
approaches 100 percent even with only two copies.
approaches 100 percent even with only two copies. (Supposing that the
errors are randomly located inside each copy).
Lziprecover is not a replacement for regular backups, but a last line of
defense for the case where the backups are also damaged.