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Merging upstream version 1.5~pre2.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-17 20:27:34 +01:00
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doc/clzip.info
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@ -3,7 +3,7 @@ clzip.texinfo.
INFO-DIR-SECTION Data Compression
START-INFO-DIR-ENTRY
* Clzip: (clzip). Data compressor based on the LZMA algorithm
* Clzip: (clzip). LZMA lossless data compressor
END-INFO-DIR-ENTRY

@ -12,17 +12,17 @@ File: clzip.info, Node: Top, Next: Introduction, Up: (dir)
Clzip Manual
************
This manual is for Clzip (version 1.5-pre1, 13 May 2013).
This manual is for Clzip (version 1.5-pre2, 17 July 2013).
* Menu:
* Introduction:: Purpose and features of clzip
* Algorithm:: How clzip compresses the data
* Invoking Clzip:: Command line interface
* File Format:: Detailed format of the compressed file
* Examples:: A small tutorial with examples
* Problems:: Reporting bugs
* Concept Index:: Index of concepts
* Introduction:: Purpose and features of clzip
* Algorithm:: How clzip compresses the data
* Invoking clzip:: Command line interface
* File format:: Detailed format of the compressed file
* Examples:: A small tutorial with examples
* Problems:: Reporting bugs
* Concept index:: Index of concepts
Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
@ -36,23 +36,39 @@ File: clzip.info, Node: Introduction, Next: Algorithm, Prev: Top, Up: Top
1 Introduction
**************
Clzip is a lossless data compressor based on the LZMA algorithm, with
very safe integrity checking and a user interface similar to the one of
gzip or bzip2. Clzip decompresses almost as fast as gzip and compresses
better than bzip2, which makes it well suited for software distribution
and data archiving.
Clzip is a lossless data compressor with a user interface similar to the
one of gzip or bzip2. Clzip decompresses almost as fast as gzip and
compresses more than bzip2, which makes it well suited for software
distribution and data archiving. Clzip is a clean implementation of the
LZMA algorithm.
Clzip uses the same well-defined exit status values used by bzip2,
which makes it safer when used in pipes or scripts than compressors
returning ambiguous warning values, like gzip.
Clzip uses the same well-defined exit status values used by lzip and
bzip2, which makes it safer when used in pipes or scripts than
compressors returning ambiguous warning values, like gzip.
Clzip uses the lzip file format; the files produced by clzip are
fully compatible with lzip-1.4 or newer. Clzip is in fact a C language
version of lzip, intended for embedded devices or systems lacking a C++
compiler.
fully compatible with lzip-1.4 or newer, and can be rescued with
lziprecover. Clzip is in fact a C language version of lzip, intended
for embedded devices or systems lacking a C++ compiler.
The lzip file format is designed for long-term data archiving and
provides very safe integrity checking. The member trailer stores the
32-bit CRC of the original data, the size of the original data and the
size of the member. These values, together with the value remaining in
the range decoder and the end-of-stream marker, provide a 4 factor
integrity checking which guarantees that the decompressed version of the
data is identical to the original. This guards against corruption of the
compressed data, and against undetected bugs in clzip (hopefully very
unlikely). The chances of data corruption going undetected are
microscopic. Be aware, though, that the check occurs upon decompression,
so it can only tell you that something is wrong. It can't help you
recover the original uncompressed data.
If you ever need to recover data from a damaged lzip file, try the
lziprecover program.
lziprecover program. Lziprecover makes lzip files resistant to bit-flip
(one of the most common forms of data corruption), and provides data
recovery capabilities, including error-checked merging of damaged copies
of a file.
Clzip replaces every file given in the command line with a compressed
version of itself, with the name "original_name.lz". Each compressed
@ -99,20 +115,8 @@ filename.lz becomes filename
filename.tlz becomes filename.tar
anyothername becomes anyothername.out
As a self-check for your protection, clzip stores in the member
trailer the 32-bit CRC of the original data, the size of the original
data and the size of the member. These values, together with the value
remaining in the range decoder and the end-of-stream marker, provide a
very safe 4 factor integrity checking which guarantees that the
decompressed version of the data is identical to the original. This
guards against corruption of the compressed data, and against
undetected bugs in clzip (hopefully very unlikely). The chances of data
corruption going undetected are microscopic. Be aware, though, that the
check occurs upon decompression, so it can only tell you that something
is wrong. It can't help you recover the original uncompressed data.

File: clzip.info, Node: Algorithm, Next: Invoking Clzip, Prev: Introduction, Up: Top
File: clzip.info, Node: Algorithm, Next: Invoking clzip, Prev: Introduction, Up: Top
2 Algorithm
***********
@ -173,9 +177,9 @@ range encoding), Igor Pavlov (for putting all the above together in
LZMA), and Julian Seward (for bzip2's CLI and the idea of unzcrash).

File: clzip.info, Node: Invoking Clzip, Next: File Format, Prev: Algorithm, Up: Top
File: clzip.info, Node: Invoking clzip, Next: File format, Prev: Algorithm, Up: Top
3 Invoking Clzip
3 Invoking clzip
****************
The format for running clzip is:
@ -278,10 +282,10 @@ The format for running clzip is:
`--verbose'
Verbose mode.
When compressing, show the compression ratio for each file
processed.
processed. A second -v shows the progress of compression.
When decompressing or testing, further -v's (up to 4) increase the
verbosity level, showing status, dictionary size, compression
ratio, and trailer contents (CRC, data size, member size).
verbosity level, showing status, compression ratio, dictionary
size, and trailer contents (CRC, data size, member size).
`-1 .. -9'
Set the compression parameters (dictionary size and match length
@ -333,9 +337,9 @@ invalid input file, 3 for an internal consistency error (eg, bug) which
caused clzip to panic.

File: clzip.info, Node: File Format, Next: Examples, Prev: Invoking Clzip, Up: Top
File: clzip.info, Node: File format, Next: Examples, Prev: Invoking clzip, Up: Top
4 File Format
4 File format
*************
Perfection is reached, not when there is no longer anything to add, but
@ -389,7 +393,8 @@ additional information before, between, or after them.
`Lzma stream'
The lzma stream, finished by an end of stream marker. Uses default
values for encoder properties.
values for encoder properties. See the lzip manual for a full
description.
`CRC32 (4 bytes)'
CRC of the uncompressed original data.
@ -405,7 +410,7 @@ additional information before, between, or after them.

File: clzip.info, Node: Examples, Next: Problems, Prev: File Format, Up: Top
File: clzip.info, Node: Examples, Next: Problems, Prev: File format, Up: Top
5 A small tutorial with examples
********************************
@ -478,7 +483,7 @@ file with a member size of 32MiB.
clzip -b 32MiB -S 650MB big_db

File: clzip.info, Node: Problems, Next: Concept Index, Prev: Examples, Up: Top
File: clzip.info, Node: Problems, Next: Concept index, Prev: Examples, Up: Top
6 Reporting Bugs
****************
@ -493,9 +498,9 @@ for all eternity, if not longer.
by running `clzip --version'.

File: clzip.info, Node: Concept Index, Prev: Problems, Up: Top
File: clzip.info, Node: Concept index, Prev: Problems, Up: Top
Concept Index
Concept index
*************
[index]
@ -504,25 +509,25 @@ Concept Index
* algorithm: Algorithm. (line 6)
* bugs: Problems. (line 6)
* examples: Examples. (line 6)
* file format: File Format. (line 6)
* file format: File format. (line 6)
* getting help: Problems. (line 6)
* introduction: Introduction. (line 6)
* invoking: Invoking Clzip. (line 6)
* options: Invoking Clzip. (line 6)
* usage: Invoking Clzip. (line 6)
* version: Invoking Clzip. (line 6)
* invoking: Invoking clzip. (line 6)
* options: Invoking clzip. (line 6)
* usage: Invoking clzip. (line 6)
* version: Invoking clzip. (line 6)

Tag Table:
Node: Top226
Node: Introduction920
Node: Algorithm4811
Node: Invoking Clzip7335
Node: File Format12847
Node: Examples15277
Node: Problems17238
Node: Concept Index17764
Node: Top212
Node: Introduction914
Node: Algorithm5096
Node: Invoking clzip7620
Node: File format13179
Node: Examples15658
Node: Problems17619
Node: Concept index18145

End Tag Table