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util/pack/lzip.lha

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Short:Data (de)compressor like gzip or bzip2
Author:antonio at gnu.org (Antonio Diaz Diaz)
Uploader:polluks+aminet sdf lonestar org (Stefan Haubenthal)
Type:util/pack
Version:1.21
Architecture:ppc-morphos
URL:http://lzip.nongnu.org
Date:2020-02-22
Download:http://aminet.net/util/pack/lzip.lha - View contents
Readme:http://aminet.net/util/pack/lzip.readme
Downloads:769
Description

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. Lzip has been designed, written and
tested with great care to replace gzip and bzip2 as the standard
general-purpose compressed format for unix-like systems.

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.

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.

Lzip uses the same well-defined exit status values used by bzip2, which
makes it safer than compressors returning ambiguous warning values (like
gzip) when it is used as a back end for other programs like tar or zutils.

Lzip will automatically use for each file the largest dictionary size
that does not exceed neither the file size nor the limit given. Keep in
mind that the decompression memory requirement is affected at
compression time by the choice of dictionary size limit.

The amount of memory required for compression is about 1 or 2 times the
dictionary size limit (1 if input file size is less than dictionary size
limit, else 2) plus 9 times the dictionary size really used. The option
'-0' is special and only requires about 1.5 MiB at most. The amount of
memory required for decompression is about 46 kB larger than the
dictionary size really used.

When compressing, lzip replaces every file given in the command line
with a compressed version of itself, with the name "original_name.lz".
When decompressing, lzip attempts to guess the name for the decompressed
file from that of the compressed file as follows:

filename.lz    becomes   filename
filename.tlz   becomes   filename.tar
anyothername   becomes   anyothername.out

(De)compressing a file is much like copying or moving it; therefore lzip
preserves the access and modification dates, permissions, and, when
possible, ownership of the file just as 'cp -p' does. (If the user ID or
the group ID can't be duplicated, the file permission bits S_ISUID and
S_ISGID are cleared).

Lzip is able to read from some types of non regular files if the
'--stdout' option is specified.

If no file names are specified, lzip compresses (or decompresses) from
standard input to standard output. In this case, lzip will decline to
write compressed output to a terminal, as this would be entirely
incomprehensible and therefore pointless.

Lzip will correctly decompress a file which is the concatenation of two or
more compressed files. The result is the concatenation of the corresponding
decompressed files. Integrity testing of concatenated compressed files is
also supported.

Lzip can produce multimember files, and lziprecover can safely recover
the undamaged members in case of file damage. Lzip can also split the
compressed output in volumes of a given size, even when reading from
standard input. This allows the direct creation of multivolume
compressed tar archives.

Lzip is able to compress and decompress streams of unlimited size by
automatically creating multimember output. The members so created are
large, about 2 PiB each.

In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not a
concrete algorithm; it is more like "any algorithm using the LZMA coding
scheme". For example, the option '-0' of lzip uses the scheme in almost
the simplest way possible; issuing the longest match it can find, or a
literal byte if it can't find a match. Inversely, a much more elaborated
way of finding coding sequences of minimum size than the one currently
used by lzip could be developed, and the resulting sequence could also
be coded using the LZMA coding scheme.

Lzip currently implements two variants of the LZMA algorithm; fast
(used by option '-0') and normal (used by all other compression levels).

The high compression of LZMA comes from combining two basic, well-proven
compression ideas: sliding dictionaries (LZ77/78) and markov models (the
thing used by every compression algorithm that uses a range encoder or
similar order-0 entropy coder as its last stage) with segregation of
contexts according to what the bits are used for.

The ideas embodied in lzip are due to (at least) the following people:
Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey Markov (for
the definition of Markov chains), G.N.N. Martin (for the definition of
range encoding), Igor Pavlov (for putting all the above together in
LZMA), and Julian Seward (for bzip2's CLI).

LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never
have been compressed. Decompressed is used to refer to data which have
undergone the process of decompression.


Copyright (C) 2008-2019 Antonio Diaz Diaz.

This file is free documentation: you have unlimited permission to copy,
distribute and modify it.

The file Makefile.in is a data file used by configure to produce the
Makefile. It has the same copyright owner and permissions that configure
itself.


Contents of util/pack/lzip.lha
 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1725    5811  29.7% -lh5- 2a5e Jan  1  2019 lzip-1.21/arg_parser.cc
[generic]                 1401    3584  39.1% -lh5- b9d7 Jan  1  2019 lzip-1.21/arg_parser.h
[generic]                  242     366  66.1% -lh5- 81ed Jul 27  2013 lzip-1.21/AUTHORS
[generic]                 4319   12891  33.5% -lh5- 7f5b Jan  3  2019 lzip-1.21/ChangeLog
[generic]                 2103    5930  35.5% -lh5- 681d Dec 31  2018 lzip-1.21/configure
[generic]                 6967   18025  38.7% -lh5- 37dd Jun 16  2014 lzip-1.21/COPYING
[generic]                 2712    8706  31.2% -lh5- 94ea Dec 31  2018 lzip-1.21/decoder.cc
[generic]                 2434    8395  29.0% -lh5- 1576 Dec 31  2018 lzip-1.21/decoder.h
[generic]                 1730    3631  47.6% -lh5- b0df Jan  3  2019 lzip-1.21/doc/lzip.1
[generic]                21356   62046  34.4% -lh5- fc1e Jan  3  2019 lzip-1.21/doc/lzip.info
[generic]                21111   60494  34.9% -lh5- d3fa Jan  3  2019 lzip-1.21/doc/lzip.texi
[generic]                 4869   19703  24.7% -lh5- 31a5 Dec 31  2018 lzip-1.21/encoder.cc
[generic]                 2716    9137  29.7% -lh5- fd8b Dec 31  2018 lzip-1.21/encoder.h
[generic]                 2044    6265  32.6% -lh5- 61f4 Dec 31  2018 lzip-1.21/encoder_base.cc
[generic]                 3689   14973  24.6% -lh5- e1f3 Dec 31  2018 lzip-1.21/encoder_base.h
[generic]                 1887    5885  32.1% -lh5- 9379 Dec 31  2018 lzip-1.21/fast_encoder.cc
[generic]                  907    1865  48.6% -lh5- c86c Dec 31  2018 lzip-1.21/fast_encoder.h
[generic]                 1098    2160  50.8% -lh5- a5d0 Dec 31  2018 lzip-1.21/INSTALL
[generic]                 1555    4356  35.7% -lh5- 9325 Dec 31  2018 lzip-1.21/list.cc
[generic]               150921  354868  42.5% -lh5- 261b Feb 22 20:39 lzip-1.21/lzip
[generic]                 3368   10748  31.3% -lh5- aa1f Dec 31  2018 lzip-1.21/lzip.h
[generic]                 2250    7502  30.0% -lh5- d777 Dec 31  2018 lzip-1.21/lzip_index.cc
[generic]                 1082    2819  38.4% -lh5- 5078 Dec 31  2018 lzip-1.21/lzip_index.h
[generic]                 9808   35268  27.8% -lh5- 959c Jan  1  2019 lzip-1.21/main.cc
[generic]                 1131    4164  27.2% -lh5- a79a Mar 21  2018 lzip-1.21/Makefile.in
[generic]                  348     528  65.9% -lh5- b912 Dec 10  2018 lzip-1.21/NEWS
[generic]                 2740    6190  44.3% -lh5- 7e3d Jan  2  2019 lzip-1.21/README
[generic]                 2265   13047  17.4% -lh5- 7ce0 Dec 31  2018 lzip-1.21/testsuite/check.sh
[generic]                13650   36388  37.5% -lh5- 8ee1 Jun 16  2014 lzip-1.21/testsuite/test.txt
[generic]                 7376    7376 100.0% -lh0- e4f2 Jun 16  2014 lzip-1.21/testsuite/test.txt.lz
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        30 files  279804  733121  38.2%            Feb 22 23:09

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