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[Lzip-bug] Lziprecover 1.20 released
Antonio Diaz Diaz
[Lzip-bug] Lziprecover 1.20 released
Wed, 14 Feb 2018 20:16:57 +0100
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I am pleased to announce the release of lziprecover 1.20.
Lziprecover is a data recovery tool and decompressor for files in the
lzip compressed data format (.lz). Lziprecover is able to repair
slightly damaged 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.
Lziprecover provides random access to the data in multimember files; it
only decompresses the members containing the desired data.
Lziprecover is not a replacement for regular backups, but a last line of
defense for the case where the backups are also damaged.
Lziprecover is able to recover or decompress files produced by any of
the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
The lzip file format is designed for data sharing and long-term
archiving, taking into account both data integrity and decoder availability.
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
the help of lziprecover, losing an entire archive just because of a
corrupt byte near the beginning is a thing of the past.
The homepage is at http://www.nongnu.org/lzip/lziprecover.html
The sources can be downloaded from
The sha256sums are:
This release is also GPG signed. You can download the signature by
appending '.sig' to the URL. If the 'gpg --verify' command fails because
you don't have the required public key, then run this command to import it:
gpg --keyserver keys.gnupg.net --recv-keys 8FE99503132D7742
Key fingerprint = 1D41 C14B 272A 2219 A739 FA4F 8FE9 9503 132D 7742
Changes in version 1.20:
* Splitting was broken for files larger than 64 KiB because of a bug
introduced in version 1.16. (Thanks to Hampa Hug for reporting this).
* The options "--dump-tdata", "--remove-tdata", and "--strip-tdata"
have been added to ease the management of metadata stored as trailing data:
"--dump-tdata" dumps the trailing data (if any) of one or more
regular files to standard output.
"--remove-tdata" removes the trailing data from regular files in place.
"--strip-tdata" copies one or more regular files to standard output,
stripping the trailing data (if any) from each file.
* The option '--loose-trailing', has been added.
* The test used by lziprecover to discriminate trailing data from a
corrupt header in multimember or concatenated files has been improved to
a Hamming distance (HD) of 3, and the 3 bit flips must happen in
different magic bytes for the test to fail. As a consequence some kinds
of files no longer can be appended to a lzip file as trailing data
unless the '--loose-trailing' option is used when decompressing.
Lziprecover can be used to remove conflicting trailing data from a file.
* The contents of a corrupt or truncated header found in a
multimember file are now shown, after the error message, in the same
format as trailing data.
* The 'bits/byte' ratio has been replaced with the inverse
compression ratio in the output.
* The progress of decompression is now shown at verbosity level 2
(-vv) or higher.
* Progress of decompression is only shown if stderr is a terminal.
* A final diagnostic is now shown at verbosity level 1 (-v) or higher
if any file fails the test when testing multiple files.
* In case of (de)compressed size mismatch, the stored size is now
also shown in hexadecimal to ease visual comparison.
* The dictionary size is now shown at verbosity level 4 (-vvvv) when
decompressing or testing.
Please send bug reports and suggestions to address@hidden
Antonio Diaz, lziprecover author and maintainer.
If you are distributing software in xz format, please consider using
lzip instead. See http://www.nongnu.org/lzip/lzip_benchmark.html#xz1 and
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