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Merging upstream version 1.11.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-24 04:19:26 +01:00
parent 2b58741015
commit 648618884e
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
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README
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@ -1,18 +1,19 @@
Description
Plzip is a massively parallel (multi-threaded) implementation of lzip, fully
Plzip is a massively parallel (multi-threaded) implementation of lzip,
compatible with lzip 1.4 or newer. Plzip uses the compression library lzlib.
Lzip is a lossless data compressor with a user interface similar to the one
of gzip or bzip2. Lzip uses a simplified form of the 'Lempel-Ziv-Markov
chain-Algorithm' (LZMA) stream format and provides a 3 factor integrity
checking to maximize interoperability and optimize safety. 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.
chain-Algorithm' (LZMA) stream format to maximize interoperability. The
maximum dictionary size is 512 MiB so that any lzip file can be decompressed
on 32-bit machines. Lzip provides accurate and robust 3-factor integrity
checking. 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.
Plzip can compress/decompress large files on multiprocessor machines much
faster than lzip, at the cost of a slightly reduced compression ratio (0.4
@ -27,11 +28,12 @@ alignment between tar members and lzip members.
When compressing, plzip divides the input file into chunks and compresses as
many chunks simultaneously as worker threads are chosen, creating a
multimember compressed file.
multimember compressed file. Each chunk is compressed in-place (using the
same buffer for input and output), reducing the amount of RAM required.
When decompressing, plzip decompresses as many members simultaneously as
worker threads are chosen. Files that were compressed with lzip will not
be decompressed faster than using lzip (unless the option '-b' was used)
worker threads are chosen. Files that were compressed with lzip are not
decompressed faster than using lzip (unless the option '-b' was used)
because lzip usually produces single-member files, which can't be
decompressed in parallel.
@ -63,9 +65,9 @@ Plzip uses the same well-defined exit status values used by lzip, 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.
Plzip 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
Plzip automatically uses 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.
When compressing, plzip replaces every file given in the command line
@ -78,20 +80,20 @@ filename.tlz becomes filename.tar
anyothername becomes anyothername.out
(De)compressing a file is much like copying or moving it. Therefore plzip
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).
preserves the access and modification dates, permissions, and, if you have
appropriate privileges, 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).
Plzip is able to read from some types of non-regular files if either the
option '-c' or the option '-o' is specified.
If no file names are specified, plzip compresses (or decompresses) from
standard input to standard output. Plzip will refuse to read compressed data
standard input to standard output. Plzip refuses to read compressed data
from a terminal or write compressed data to a terminal, as this would be
entirely incomprehensible and might leave the terminal in an abnormal state.
Plzip will correctly decompress a file which is the concatenation of two or
Plzip correctly decompresses 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.
@ -101,11 +103,10 @@ been compressed. Decompressed is used to refer to data which have undergone
the process of decompression.
Copyright (C) 2009-2022 Antonio Diaz Diaz.
Copyright (C) 2009-2024 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.
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.