Merging upstream version 1.4.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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@ -12,7 +12,7 @@ File: clzip.info, Node: Top, Next: Introduction, Up: (dir)
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Clzip Manual
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************
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This manual is for Clzip (version 1.3, 25 February 2012).
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This manual is for Clzip (version 1.4, 18 February 2013).
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* Menu:
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@ -25,7 +25,7 @@ This manual is for Clzip (version 1.3, 25 February 2012).
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* Concept Index:: Index of concepts
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Copyright (C) 2010, 2011, 2012 Antonio Diaz Diaz.
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Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
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This manual is free documentation: you have unlimited permission to
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copy, distribute and modify it.
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@ -73,11 +73,15 @@ also split the compressed output in volumes of a given size, even when
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reading from standard input. This allows the direct creation of
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multivolume compressed tar archives.
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The amount of memory required for compression is about 5 MiB plus 1
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or 2 times the dictionary size limit (1 if input file size is less than
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dictionary size limit, else 2) plus 8 times the dictionary size really
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used. The amount of memory required for decompression is only a few tens
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of KiB larger than the dictionary size really used.
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Clzip is able to compress and decompress streams of unlimited size by
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automatically creating multi-member output. The members so created are
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large (about 2^60 bytes each).
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The amount of memory required for compression is about 1 or 2 times
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the dictionary size limit (1 if input file size is less than dictionary
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size limit, else 2) plus 9 times the dictionary size really used. The
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amount of memory required for decompression is only a few tens of KiB
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larger than the dictionary size really used.
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Clzip will automatically use the smallest possible dictionary size
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without exceeding the given limit. Keep in mind that the decompression
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@ -328,7 +332,12 @@ File: clzip.info, Node: File Format, Next: Examples, Prev: Invoking Clzip, U
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4 File Format
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*************
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In the diagram below, a box like this:
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Perfection is reached, not when there is no longer anything to add, but
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when there is no longer anything to take away.
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-- Antoine de Saint-Exupery
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In the diagram below, a box like this:
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+---+
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| | <-- the vertical bars might be missing
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+---+
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@ -357,15 +366,18 @@ additional information before, between, or after them.
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"LZIP".
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`VN (version number, 1 byte)'
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Just in case something needs to be modified in the future. Valid
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values are 0 and 1. Version 0 files are deprecated. They can
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contain only one member and lack the `Member size' field.
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Just in case something needs to be modified in the future. 1 for
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now.
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`DS (coded dictionary size, 1 byte)'
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Bits 4-0 contain the base 2 logarithm of the base dictionary size.
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Bits 7-5 contain the number of "wedges" to substract from the base
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dictionary size to obtain the dictionary size. The size of a wedge
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is (base dictionary size / 16).
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Lzip divides the distance between any two powers of 2 into 8
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equally spaced intervals, named "wedges". The dictionary size is
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calculated by taking a power of 2 (the base size) and substracting
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from it a number of wedges between 0 and 7. The size of a wedge is
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(base_size / 16).
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Bits 4-0 contain the base 2 logarithm of the base size (12 to 29).
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Bits 7-5 contain the number of wedges (0 to 7) to substract from
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the base size to obtain the dictionary size.
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Valid values for dictionary size range from 4KiB to 512MiB.
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`Lzma stream'
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@ -379,9 +391,9 @@ additional information before, between, or after them.
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Size of the uncompressed original data.
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`Member size (8 bytes)'
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Total size of the member, including header and trailer. This
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facilitates safe recovery of undamaged members from multi-member
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files.
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Total size of the member, including header and trailer. This field
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acts as a distributed index, and facilitates safe recovery of
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undamaged members from multi-member files.
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@ -496,13 +508,13 @@ Concept Index
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Tag Table:
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Node: Top226
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Node: Introduction914
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Node: Algorithm4584
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Node: Invoking Clzip7108
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Node: File Format12380
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Node: Examples14375
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Node: Problems16336
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Node: Concept Index16862
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Node: Introduction920
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Node: Algorithm4755
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Node: Invoking Clzip7279
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Node: File Format12551
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Node: Examples14860
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Node: Problems16821
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Node: Concept Index17347
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End Tag Table
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