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[Lzip-bug] Lzip 1.20 released
Antonio Diaz Diaz
[Lzip-bug] Lzip 1.20 released
Fri, 16 Feb 2018 16:04:28 +0100
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I am pleased to announce the release of lzip 1.20.
This year we are celebrating the 10th anniversary of lzip. Ten years
providing a high quality compression format whose design is based on the
excellent LZMA "algorithm" and on the lessons learned from previous
compressors (gzip and bzip2). Thanks to all the people who made it
Lzip is a lossless data compressor with a user interface similar to the
one of gzip or bzip2. Lzip can compress about as fast as gzip (lzip -0),
or compress most files more than bzip2 (lzip -9). Decompression speed is
intermediate between gzip and bzip2. Lzip is better than gzip and bzip2
from a data recovery perspective.
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
(one of the most common forms of data corruption) in lzip files,
and provides data recovery capabilities, including error-checked
merging of damaged copies of a file.
* The lzip format is as simple as possible (but not simpler). The
lzip manual provides the source code of a simple decompressor along
with a detailed explanation of how it works, so that with the only
help of the lzip manual it would be possible for a digital
archaeologist to extract the data from a lzip file long after
quantum computers eventually render LZMA obsolete.
* Additionally the lzip reference implementation is copylefted, which
guarantees that it will remain free forever.
The homepage is at http://www.nongnu.org/lzip/lzip.html
A benchmark can be found at http://www.nongnu.org/lzip/lzip_benchmark.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:
* The option '--loose-trailing', has been added.
* The test used by lzip 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.
* Option '-S, --volume-size' now keeps input files unchanged.
* When creating multimember files or splitting the output in volumes,
the dictionary size is now adjusted for each member individually.
* 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 (de)compression 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.
* A second '.lz' extension is no longer added to the argument of '-o'
if it already ends in '.lz' or '.tlz'.
* 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.
* The new chapter "Meaning of lzip's output" has been added to the
Please send bug reports and suggestions to address@hidden
Antonio Diaz, lzip 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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