diff options
Diffstat (limited to 'doc/lzlib.info')
| -rw-r--r-- | doc/lzlib.info | 51 |
1 files changed, 25 insertions, 26 deletions
diff --git a/doc/lzlib.info b/doc/lzlib.info index 5a32927..6ef6f46 100644 --- a/doc/lzlib.info +++ b/doc/lzlib.info @@ -11,7 +11,7 @@ File: lzlib.info, Node: Top, Next: Introduction, Up: (dir) Lzlib Manual ************ -This manual is for Lzlib (version 1.7-pre1, 24 February 2015). +This manual is for Lzlib (version 1.7-rc1, 23 May 2015). * Menu: @@ -102,13 +102,14 @@ install any signal handler. The decoder checks the consistency of the compressed data, so the library should never crash even in case of corrupted input. - There is no such thing as a "LZMA algorithm"; it is more like a "LZMA + 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 price than the one -currently used by lzip could be developed, and the resulting sequence -could also be coded using the LZMA coding scheme. +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. Lzlib currently implements two variants of the LZMA algorithm; fast (used by option -0 of minilzip) and normal (used by all other @@ -591,14 +592,12 @@ with no 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. @@ -785,18 +784,18 @@ Concept index Tag Table: Node: Top220 -Node: Introduction1311 -Node: Library version5808 -Node: Buffering6453 -Node: Parameter limits7673 -Node: Compression functions8632 -Node: Decompression functions15176 -Node: Error codes21344 -Node: Error messages23283 -Node: Data format23862 -Node: Examples26538 -Node: Problems30624 -Node: Concept index31196 +Node: Introduction1305 +Node: Library version5869 +Node: Buffering6514 +Node: Parameter limits7734 +Node: Compression functions8693 +Node: Decompression functions15237 +Node: Error codes21405 +Node: Error messages23344 +Node: Data format23923 +Node: Examples26469 +Node: Problems30555 +Node: Concept index31127 End Tag Table |