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Merging upstream version 1.5~rc1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-17 22:13:49 +01:00
parent 77bdbc7c3f
commit 72d0c3db43
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
11 changed files with 245 additions and 43 deletions
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26
README
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@ -5,13 +5,23 @@ small size makes it well suited for embedded devices or software
installers that need to decompress files but do not need compression
capabilities. Lunzip is fully compatible with lzip-1.4 or newer.
If the size of the output buffer is specified with the "--buffer-size"
option, lunzip uses the decompressed file as dictionary for distances
beyond the buffer size and is able to decompress any file using as
little memory as 50 kB, irrespective of the dictionary size used to
compress the file. Of course, the smaller the output buffer size used in
relation to the dictionary size, the more accesses to disk are needed
and the slower the decompression is. This "low memory" mode only works
when decompressing to a regular file.
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.
Lunzip uses the same well-defined exit status values used by lzip and
bzip2, which makes it safer when used in pipes or scripts than
decompressors returning ambiguous warning values, like gunzip.
bzip2, which makes it safer than decompressors returning ambiguous
warning values (like gunzip) when it is used as a back end for tar or
zutils.
Lunzip replaces every file given in the command line with a decompressed
version of itself. Each decompressed file has the same modification
@ -35,9 +45,15 @@ two or more compressed files. The result is the concatenation of the
corresponding uncompressed files. Integrity testing of concatenated
compressed files is also supported.
The amount of memory required by lunzip to decompress a file is only a
few tens of KiB larger than the dictionary size used to compress that
file.
The amount of memory required by lunzip to decompress a file is about
46 kB larger than the dictionary size used to compress that file, unless
the "--buffer-size" option is specified.
The ideas embodied in lunzip 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).
Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.