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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.texinfo
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.texinfo')
-rw-r--r--doc/clzip.texinfo93
1 files changed, 49 insertions, 44 deletions
diff --git a/doc/clzip.texinfo b/doc/clzip.texinfo
index e372d60..49d0761 100644
--- a/doc/clzip.texinfo
+++ b/doc/clzip.texinfo
@@ -6,19 +6,19 @@
@finalout
@c %**end of header
-@set UPDATED 13 May 2013
-@set VERSION 1.5-pre1
+@set UPDATED 17 July 2013
+@set VERSION 1.5-pre2
@dircategory Data Compression
@direntry
-* Clzip: (clzip). Data compressor based on the LZMA algorithm
+* Clzip: (clzip). LZMA lossless data compressor
@end direntry
@ifnothtml
@titlepage
@title Clzip
-@subtitle Data compressor based on the LZMA algorithm
+@subtitle LZMA lossless data compressor
@subtitle for Clzip version @value{VERSION}, @value{UPDATED}
@author by Antonio Diaz Diaz
@@ -35,13 +35,13 @@
This manual is for Clzip (version @value{VERSION}, @value{UPDATED}).
@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
@end menu
@sp 1
@@ -55,23 +55,39 @@ to copy, distribute and modify it.
@chapter Introduction
@cindex 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.
+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
@@ -120,18 +136,6 @@ file from that of the compressed file as follows:
@item anyothername @tab becomes @tab anyothername.out
@end multitable
-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.
-
@node Algorithm
@chapter Algorithm
@@ -194,8 +198,8 @@ range encoding), Igor Pavlov (for putting all the above together in
LZMA), and Julian Seward (for bzip2's CLI and the idea of unzcrash).
-@node Invoking Clzip
-@chapter Invoking Clzip
+@node Invoking clzip
+@chapter Invoking clzip
@cindex invoking
@cindex options
@cindex usage
@@ -296,9 +300,10 @@ Use it together with @samp{-v} to see information about the file.
@item -v
@itemx --verbose
Verbose mode.@*
-When compressing, show the compression ratio for each file processed.@*
+When compressing, show the compression ratio for each file 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,
+verbosity level, showing status, compression ratio, dictionary size,
and trailer contents (CRC, data size, member size).
@item -1 .. -9
@@ -356,8 +361,8 @@ invalid input file, 3 for an internal consistency error (eg, bug) which
caused clzip to panic.
-@node File Format
-@chapter File Format
+@node File format
+@chapter File format
@cindex file format
Perfection is reached, not when there is no longer anything to add, but
@@ -415,7 +420,7 @@ Valid values for dictionary size range from 4KiB to 512MiB.
@item Lzma stream
The lzma stream, finished by an end of stream marker. Uses default values
-for encoder properties.
+for encoder properties. See the lzip manual for a full description.
@item CRC32 (4 bytes)
CRC of the uncompressed original data.
@@ -549,8 +554,8 @@ If you find a bug in clzip, please send electronic mail to
find by running @w{@samp{clzip --version}}.
-@node Concept Index
-@unnumbered Concept Index
+@node Concept index
+@unnumbered Concept index
@printindex cp