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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-06 11:39:02 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-06 11:39:02 +0000
commit243f444e517f5319ff1fc0cd5c5145388a883940 (patch)
treeab207ec478cb32a6ba58a9538275ade26e750f3d /doc/clzip.info
parentAdding debian version 1.5~pre1-3. (diff)
downloadclzip-243f444e517f5319ff1fc0cd5c5145388a883940.tar.xz
clzip-243f444e517f5319ff1fc0cd5c5145388a883940.zip
Merging upstream version 1.5~pre2.
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to 'doc/clzip.info')
-rw-r--r--doc/clzip.info123
1 files changed, 64 insertions, 59 deletions
diff --git a/doc/clzip.info b/doc/clzip.info
index 41723f3..263affa 100644
--- a/doc/clzip.info
+++ b/doc/clzip.info
@@ -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
*************
@@ -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