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diff --git a/doc/lzip.info b/doc/lzip.info index 9c4e874..97d2bbb 100644 --- a/doc/lzip.info +++ b/doc/lzip.info @@ -2,7 +2,7 @@ This is lzip.info, produced by makeinfo version 4.13 from lzip.texinfo. INFO-DIR-SECTION Data Compression START-INFO-DIR-ENTRY -* Lzip: (lzip). Data compressor based on the LZMA algorithm +* Lzip: (lzip). LZMA lossless data compressor END-INFO-DIR-ENTRY @@ -11,19 +11,19 @@ File: lzip.info, Node: Top, Next: Introduction, Up: (dir) Lzip Manual *********** -This manual is for Lzip (version 1.15-pre2, 11 May 2013). +This manual is for Lzip (version 1.15-pre3, 15 July 2013). * Menu: * Introduction:: Purpose and features of lzip * Algorithm:: How lzip compresses the data -* Invoking Lzip:: Command line interface -* File Format:: Detailed format of the compressed file -* Stream Format:: Format of the LZMA stream in lzip files +* Invoking lzip:: Command line interface +* File format:: Detailed format of the compressed file +* Stream format:: Format of the LZMA stream in lzip files * Examples:: A small tutorial with examples * Problems:: Reporting bugs * Reference source code:: Source code illustrating stream format -* Concept Index:: Index of concepts +* Concept index:: Index of concepts Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz. @@ -37,18 +37,33 @@ File: lzip.info, Node: Introduction, Next: Algorithm, Prev: Top, Up: Top 1 Introduction ************** -Lzip 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. Lzip decompresses almost as fast as gzip and compresses -better than bzip2, which makes it well suited for software distribution -and data archiving. +Lzip is a lossless data compressor with a user interface similar to the +one of gzip or bzip2. Lzip decompresses almost as fast as gzip and +compresses more than bzip2, which makes it well suited for software +distribution and data archiving. Lzip is a clean implementation of the +LZMA algorithm. Lzip 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. + 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 lzip (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 files. Lzip replaces every file given in the command line with a compressed version of itself, with the name "original_name.lz". Each compressed @@ -96,20 +111,8 @@ filename.lz becomes filename filename.tlz becomes filename.tar anyothername becomes anyothername.out - As a self-check for your protection, lzip 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 lzip (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: lzip.info, Node: Algorithm, Next: Invoking Lzip, Prev: Introduction, Up: Top +File: lzip.info, Node: Algorithm, Next: Invoking lzip, Prev: Introduction, Up: Top 2 Algorithm *********** @@ -170,9 +173,9 @@ 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: lzip.info, Node: Invoking Lzip, Next: File Format, Prev: Algorithm, Up: Top +File: lzip.info, Node: Invoking lzip, Next: File format, Prev: Algorithm, Up: Top -3 Invoking Lzip +3 Invoking lzip *************** The format for running lzip is: @@ -275,10 +278,10 @@ The format for running lzip 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, trailer contents (CRC, data size, member size), and up to 6 + verbosity level, showing status, compression ratio, dictionary + size, trailer contents (CRC, data size, member size), and up to 6 bytes of trailing garbage (if any). `-0 .. -9' @@ -332,9 +335,9 @@ invalid input file, 3 for an internal consistency error (eg, bug) which caused lzip to panic. -File: lzip.info, Node: File Format, Next: Stream Format, Prev: Invoking Lzip, Up: Top +File: lzip.info, Node: File format, Next: Stream format, Prev: Invoking lzip, Up: Top -4 File Format +4 File format ************* Perfection is reached, not when there is no longer anything to add, but @@ -404,7 +407,7 @@ additional information before, between, or after them. -File: lzip.info, Node: Stream Format, Next: Examples, Prev: File Format, Up: Top +File: lzip.info, Node: Stream format, Next: Examples, Prev: File format, Up: Top 5 Format of the LZMA stream in lzip files ***************************************** @@ -596,7 +599,7 @@ with the appropiate contexts to decode the different coding sequences Stream" marker is decoded. -File: lzip.info, Node: Examples, Next: Problems, Prev: Stream Format, Up: Top +File: lzip.info, Node: Examples, Next: Problems, Prev: Stream format, Up: Top 6 A small tutorial with examples ******************************** @@ -684,7 +687,7 @@ for all eternity, if not longer. by running `lzip --version'. -File: lzip.info, Node: Reference source code, Next: Concept Index, Prev: Problems, Up: Top +File: lzip.info, Node: Reference source code, Next: Concept index, Prev: Problems, Up: Top Appendix A Reference source code ******************************** @@ -1137,9 +1140,9 @@ int main( const int argc, const char * const argv[] ) } -File: lzip.info, Node: Concept Index, Prev: Reference source code, Up: Top +File: lzip.info, Node: Concept index, Prev: Reference source code, Up: Top -Concept Index +Concept index ************* @@ -1148,29 +1151,29 @@ Concept Index * algorithm: Algorithm. (line 6) * bugs: Problems. (line 6) * examples: Examples. (line 6) -* file format: File Format. (line 6) -* format of the LZMA stream: Stream Format. (line 6) +* file format: File format. (line 6) +* format of the LZMA stream: Stream format. (line 6) * getting help: Problems. (line 6) * introduction: Introduction. (line 6) -* invoking: Invoking Lzip. (line 6) -* options: Invoking Lzip. (line 6) +* invoking: Invoking lzip. (line 6) +* options: Invoking lzip. (line 6) * reference source code: Reference source code. (line 6) -* usage: Invoking Lzip. (line 6) -* version: Invoking Lzip. (line 6) +* usage: Invoking lzip. (line 6) +* version: Invoking lzip. (line 6) Tag Table: -Node: Top224 -Node: Introduction1065 -Node: Algorithm4786 -Node: Invoking Lzip7304 -Node: File Format12895 -Node: Stream Format15328 -Node: Examples24042 -Node: Problems25991 -Node: Reference source code26521 -Node: Concept Index39768 +Node: Top210 +Node: Introduction1052 +Node: Algorithm5006 +Node: Invoking lzip7524 +Node: File format13162 +Node: Stream format15595 +Node: Examples24309 +Node: Problems26258 +Node: Reference source code26788 +Node: Concept index40035 End Tag Table |