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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-06 12:52:43 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-06 12:52:43 +0000
commit73f5ce5a1a7ef15a0e889bf2416e401db59f8c28 (patch)
tree7bf509a1fbb746c7c77b3a7dce30d192729be136 /doc/clzip.info
parentAdding debian version 1.7~pre1-1. (diff)
downloadclzip-73f5ce5a1a7ef15a0e889bf2416e401db59f8c28.tar.xz
clzip-73f5ce5a1a7ef15a0e889bf2416e401db59f8c28.zip
Merging upstream version 1.7~rc1.
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to 'doc/clzip.info')
-rw-r--r--doc/clzip.info50
1 files changed, 24 insertions, 26 deletions
diff --git a/doc/clzip.info b/doc/clzip.info
index 848adc2..b66195e 100644
--- a/doc/clzip.info
+++ b/doc/clzip.info
@@ -11,7 +11,7 @@ File: clzip.info, Node: Top, Next: Introduction, Up: (dir)
Clzip Manual
************
-This manual is for Clzip (version 1.7-pre1, 26 February 2015).
+This manual is for Clzip (version 1.7-rc1, 23 May 2015).
* Menu:
@@ -38,8 +38,7 @@ File: clzip.info, Node: Introduction, Next: Algorithm, Prev: Top, Up: Top
Clzip is a lossless data compressor with a user interface similar to the
one of gzip or bzip2. Clzip is about as fast as gzip, compresses most
files more than bzip2, and is better than both from a data recovery
-perspective. Clzip is a clean implementation of the LZMA
-(Lempel-Ziv-Markov chain-Algorithm) "algorithm".
+perspective.
Clzip uses the lzip file format; the files produced by clzip are
fully compatible with lzip-1.4 or newer, and can be rescued with
@@ -136,7 +135,7 @@ multivolume compressed tar archives.
Clzip is able to compress and decompress streams of unlimited size by
automatically creating multi-member output. The members so created are
-large, about 64 PiB each.
+large, about 2 PiB each.

File: clzip.info, Node: Algorithm, Next: Invoking clzip, Prev: Introduction, Up: Top
@@ -144,13 +143,14 @@ File: clzip.info, Node: Algorithm, Next: Invoking clzip, Prev: Introduction,
2 Algorithm
***********
-There is no such thing as a "LZMA algorithm"; it is more like a "LZMA
-coding scheme". For example, the option '-0' of lzip uses the scheme in
-almost the simplest way possible; issuing the longest match it can find,
-or a literal byte if it can't find a match. Inversely, a much more
-elaborated way of finding coding sequences of minimum price than the one
-currently used by lzip could be developed, and the resulting sequence
-could also be coded using the LZMA coding scheme.
+In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not a
+concrete algorithm; it is more like "any algorithm using the LZMA coding
+scheme". For example, the option '-0' of lzip uses the scheme in almost
+the simplest way possible; issuing the longest match it can find, or a
+literal byte if it can't find a match. Inversely, a much more elaborated
+way of finding coding sequences of minimum size than the one currently
+used by lzip could be developed, and the resulting sequence could also
+be coded using the LZMA coding scheme.
Clzip currently implements two variants of the LZMA algorithm; fast
(used by option -0) and normal (used by all other compression levels).
@@ -227,7 +227,7 @@ The format for running clzip is:
'--member-size=BYTES'
Set the member size limit to BYTES. A small member size may
degrade compression ratio, so use it only when needed. Valid values
- range from 100 kB to 64 PiB. Defaults to 64 PiB.
+ range from 100 kB to 2 PiB. Defaults to 2 PiB.
'-c'
'--stdout'
@@ -406,14 +406,12 @@ additional information before, between, or after them.
now.
'DS (coded dictionary size, 1 byte)'
- Lzip divides the distance between any two powers of 2 into 8
- equally spaced intervals, named "wedges". The dictionary size is
- calculated by taking a power of 2 (the base size) and substracting
- from it a number of wedges between 0 and 7. The size of a wedge is
- (base_size / 16).
+ The dictionary size is calculated by taking a power of 2 (the base
+ size) and substracting from it a fraction between 0/16 and 7/16 of
+ the base size.
Bits 4-0 contain the base 2 logarithm of the base size (12 to 29).
- Bits 7-5 contain the number of wedges (0 to 7) to substract from
- the base size to obtain the dictionary size.
+ Bits 7-5 contain the numerator of the fraction (0 to 7) to
+ substract from the base size to obtain the dictionary size.
Example: 0xD3 = 2^19 - 6 * 2^15 = 512 KiB - 6 * 32 KiB = 320 KiB
Valid values for dictionary size range from 4 KiB to 512 MiB.
@@ -547,13 +545,13 @@ Concept index

Tag Table:
Node: Top210
-Node: Introduction903
-Node: Algorithm6200
-Node: Invoking clzip8963
-Node: File format14514
-Node: Examples17046
-Node: Problems19015
-Node: Concept index19541
+Node: Introduction897
+Node: Algorithm6100
+Node: Invoking clzip8930
+Node: File format14479
+Node: Examples16881
+Node: Problems18850
+Node: Concept index19376

End Tag Table