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authorDaniel Baumann <daniel.baumann@progress-linux.org>2018-02-13 07:03:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2018-02-13 07:04:01 +0000
commit39b772cbf3d797f755f5b1fdb133fea1bedc8178 (patch)
treeaa09ba82ec4995be3d883f18c3a4f80959869f01 /doc/lzlib.info
parentReleasing debian version 1.9-5. (diff)
downloadlzlib-39b772cbf3d797f755f5b1fdb133fea1bedc8178.tar.xz
lzlib-39b772cbf3d797f755f5b1fdb133fea1bedc8178.zip
Merging upstream version 1.10.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/lzlib.info')
-rw-r--r--doc/lzlib.info284
1 files changed, 242 insertions, 42 deletions
diff --git a/doc/lzlib.info b/doc/lzlib.info
index a2a8c68..23a4d21 100644
--- a/doc/lzlib.info
+++ b/doc/lzlib.info
@@ -11,25 +11,26 @@ File: lzlib.info, Node: Top, Next: Introduction, Up: (dir)
Lzlib Manual
************
-This manual is for Lzlib (version 1.9, 11 April 2017).
+This manual is for Lzlib (version 1.10, 7 February 2018).
* Menu:
-* Introduction:: Purpose and features of lzlib
-* Library version:: Checking library version
-* Buffering:: Sizes of lzlib's buffers
-* Parameter limits:: Min / max values for some parameters
-* Compression functions:: Descriptions of the compression functions
-* Decompression functions:: Descriptions of the decompression functions
-* Error codes:: Meaning of codes returned by functions
-* Error messages:: Error messages corresponding to error codes
-* Data format:: Detailed format of the compressed data
-* Examples:: A small tutorial with examples
-* Problems:: Reporting bugs
-* Concept index:: Index of concepts
+* Introduction:: Purpose and features of lzlib
+* Library version:: Checking library version
+* Buffering:: Sizes of lzlib's buffers
+* Parameter limits:: Min / max values for some parameters
+* Compression functions:: Descriptions of the compression functions
+* Decompression functions:: Descriptions of the decompression functions
+* Error codes:: Meaning of codes returned by functions
+* Error messages:: Error messages corresponding to error codes
+* Invoking minilzip:: Command line interface of the test program
+* Data format:: Detailed format of the compressed data
+* Examples:: A small tutorial with examples
+* Problems:: Reporting bugs
+* Concept index:: Index of concepts
- Copyright (C) 2009-2017 Antonio Diaz Diaz.
+ Copyright (C) 2009-2018 Antonio Diaz Diaz.
This manual is free documentation: you have unlimited permission to
copy, distribute and modify it.
@@ -50,7 +51,7 @@ archiving, taking into account both data integrity and decoder
availability:
* The lzip format provides very safe integrity checking and some data
- recovery means. The lziprecover program can repair bit-flip errors
+ recovery means. The lziprecover program can repair bit flip errors
(one of the most common forms of data corruption) in lzip files,
and provides data recovery capabilities, including error-checked
merging of damaged copies of a file. *Note Data safety:
@@ -170,8 +171,9 @@ minimum sizes:
* Input compression buffer. Written to by the 'LZ_compress_write'
function. For the normal variant of LZMA, its size is two times
- the dictionary size set with the 'LZ_compress_open' function or 64
- KiB, whichever is larger. For the fast variant, its size is 1 MiB.
+ the dictionary size set with the 'LZ_compress_open' function or
+ 64 KiB, whichever is larger. For the fast variant, its size is
+ 1 MiB.
* Output compression buffer. Read from by the 'LZ_compress_read'
function. Its size is 64 KiB.
@@ -326,6 +328,7 @@ calling 'LZ_compress_errno' before using it.
ENCODER )
Returns 1 if all the data have been read and 'LZ_compress_close'
can be safely called. Otherwise it returns 0.
+ 'LZ_compress_finished' implies 'LZ_compress_member_finished'.
-- Function: int LZ_compress_member_finished ( struct LZ_Encoder *
const ENCODER )
@@ -532,14 +535,19 @@ whether a call failed. If the call failed, then you can examine
The end of the data stream was reached in the middle of a member.
-- Constant: enum LZ_Errno LZ_data_error
- The data stream is corrupt.
+ The data stream is corrupt. If 'LZ_decompress_member_position' is 6
+ or less, it indicates either a format version not supported, an
+ invalid dictionary size, a corrupt header in a multimember data
+ stream, or trailing data too similar to a valid lzip header.
+ Lziprecover can be used to remove conflicting trailing data from a
+ file.
-- Constant: enum LZ_Errno LZ_library_error
A bug was detected in the library. Please, report it (*note
Problems::).

-File: lzlib.info, Node: Error messages, Next: Data format, Prev: Error codes, Up: Top
+File: lzlib.info, Node: Error messages, Next: Invoking minilzip, Prev: Error codes, Up: Top
8 Error messages
****************
@@ -555,10 +563,198 @@ File: lzlib.info, Node: Error messages, Next: Data format, Prev: Error codes,
'LZ_(de)compress_errno'.

-File: lzlib.info, Node: Data format, Next: Examples, Prev: Error messages, Up: Top
+File: lzlib.info, Node: Invoking minilzip, Next: Data format, Prev: Error messages, Up: Top
+
+9 Invoking minilzip
+*******************
+
+The format for running minilzip is:
+
+ minilzip [OPTIONS] [FILES]
+
+'-' used as a FILE argument means standard input. It can be mixed with
+other FILES and is read just once, the first time it appears in the
+command line.
+
+ minilzip supports the following options:
+
+'-h'
+'--help'
+ Print an informative help message describing the options and exit.
+
+'-V'
+'--version'
+ Print the version number of minilzip on the standard output and
+ exit.
+
+'-a'
+'--trailing-error'
+ Exit with error status 2 if any remaining input is detected after
+ decompressing the last member. Such remaining input is usually
+ trailing garbage that can be safely ignored.
+
+'-b BYTES'
+'--member-size=BYTES'
+ When compressing, 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 2 PiB. Defaults to
+ 2 PiB.
+
+'-c'
+'--stdout'
+ Compress or decompress to standard output; keep input files
+ unchanged. If compressing several files, each file is compressed
+ independently. This option is needed when reading from a named
+ pipe (fifo) or from a device. Use it also to recover as much of
+ the decompressed data as possible when decompressing a corrupt
+ file.
+
+'-d'
+'--decompress'
+ Decompress the specified files. If a file does not exist or can't
+ be opened, minilzip continues decompressing the rest of the files.
+ If a file fails to decompress, or is a terminal, minilzip exits
+ immediately without decompressing the rest of the files.
+
+'-f'
+'--force'
+ Force overwrite of output files.
+
+'-F'
+'--recompress'
+ When compressing, force re-compression of files whose name already
+ has the '.lz' or '.tlz' suffix.
+
+'-k'
+'--keep'
+ Keep (don't delete) input files during compression or
+ decompression.
+
+'-m BYTES'
+'--match-length=BYTES'
+ When compressing, set the match length limit in bytes. After a
+ match this long is found, the search is finished. Valid values
+ range from 5 to 273. Larger values usually give better compression
+ ratios but longer compression times.
-9 Data format
-*************
+'-o FILE'
+'--output=FILE'
+ When reading from standard input and '--stdout' has not been
+ specified, use 'FILE' as the virtual name of the uncompressed
+ file. This produces a file named 'FILE' when decompressing, or a
+ file named 'FILE.lz' when compressing. A second '.lz' extension is
+ not added if 'FILE' already ends in '.lz' or '.tlz'. When
+ compressing and splitting the output in volumes, several files
+ named 'FILE00001.lz', 'FILE00002.lz', etc, are created.
+
+'-q'
+'--quiet'
+ Quiet operation. Suppress all messages.
+
+'-s BYTES'
+'--dictionary-size=BYTES'
+ When compressing, set the dictionary size limit in bytes. Minilzip
+ will use the smallest possible dictionary size for each file
+ without exceeding this limit. Valid values range from 4 KiB to
+ 512 MiB. Values 12 to 29 are interpreted as powers of two, meaning
+ 2^12 to 2^29 bytes. Note that dictionary sizes are quantized. If
+ the specified size does not match one of the valid sizes, it will
+ be rounded upwards by adding up to (BYTES / 8) to it.
+
+ For maximum compression you should use a dictionary size limit as
+ large as possible, but keep in mind that the decompression memory
+ requirement is affected at compression time by the choice of
+ dictionary size limit.
+
+'-S BYTES'
+'--volume-size=BYTES'
+ When compressing, split the compressed output into several volume
+ files with names 'original_name00001.lz', 'original_name00002.lz',
+ etc, and set the volume size limit to BYTES. Input files are kept
+ unchanged. Each volume is a complete, maybe multimember, lzip
+ file. A small volume size may degrade compression ratio, so use it
+ only when needed. Valid values range from 100 kB to 4 EiB.
+
+'-t'
+'--test'
+ Check integrity of the specified files, but don't decompress them.
+ This really performs a trial decompression and throws away the
+ result. Use it together with '-v' to see information about the
+ files. If a file fails the test, does not exist, can't be opened,
+ or is a terminal, minilzip continues checking the rest of the
+ files. A final diagnostic is shown at verbosity level 1 or higher
+ if any file fails the test when testing multiple files.
+
+'-v'
+'--verbose'
+ Verbose mode.
+ When compressing, show the compression ratio and size for each file
+ processed.
+ When decompressing or testing, further -v's (up to 4) increase the
+ verbosity level, showing status, compression ratio, dictionary
+ size, and trailer contents (CRC, data size, member size).
+
+'-0 .. -9'
+ Set the compression parameters (dictionary size and match length
+ limit) as shown in the table below. The default compression level
+ is '-6'. Note that '-9' can be much slower than '-0'. These
+ options have no effect when decompressing or testing.
+
+ The bidimensional parameter space of LZMA can't be mapped to a
+ linear scale optimal for all files. If your files are large, very
+ repetitive, etc, you may need to use the '--dictionary-size' and
+ '--match-length' options directly to achieve optimal performance.
+
+ Level Dictionary size Match length limit
+ -0 64 KiB 16 bytes
+ -1 1 MiB 5 bytes
+ -2 1.5 MiB 6 bytes
+ -3 2 MiB 8 bytes
+ -4 3 MiB 12 bytes
+ -5 4 MiB 20 bytes
+ -6 8 MiB 36 bytes
+ -7 16 MiB 68 bytes
+ -8 24 MiB 132 bytes
+ -9 32 MiB 273 bytes
+
+'--fast'
+'--best'
+ Aliases for GNU gzip compatibility.
+
+'--loose-trailing'
+ When decompressing or testing, allow trailing data whose first
+ bytes are so similar to the magic bytes of a lzip header that they
+ can be confused with a corrupt header. Use this option if a file
+ triggers a "corrupt header" error and the cause is not indeed a
+ corrupt header.
+
+
+ Numbers given as arguments to options may be followed by a multiplier
+and an optional 'B' for "byte".
+
+ Table of SI and binary prefixes (unit multipliers):
+
+Prefix Value | Prefix Value
+k kilobyte (10^3 = 1000) | Ki kibibyte (2^10 = 1024)
+M megabyte (10^6) | Mi mebibyte (2^20)
+G gigabyte (10^9) | Gi gibibyte (2^30)
+T terabyte (10^12) | Ti tebibyte (2^40)
+P petabyte (10^15) | Pi pebibyte (2^50)
+E exabyte (10^18) | Ei exbibyte (2^60)
+Z zettabyte (10^21) | Zi zebibyte (2^70)
+Y yottabyte (10^24) | Yi yobibyte (2^80)
+
+
+ Exit status: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or
+invalid input file, 3 for an internal consistency error (eg, bug) which
+caused minilzip to panic.
+
+
+File: lzlib.info, Node: Data format, Next: Examples, Prev: Invoking minilzip, Up: Top
+
+10 Data format
+**************
Perfection is reached, not when there is no longer anything to add, but
when there is no longer anything to take away.
@@ -578,9 +774,9 @@ when there is no longer anything to take away.
represents a variable number of bytes.
- A lzip data stream consists of a series of "members" (compressed data
-sets). The members simply appear one after another in the data stream,
-with no additional information before, between, or after them.
+ A lzip data stream consists of a series of "members" (compressed
+data sets). The members simply appear one after another in the data
+stream, with no additional information before, between, or after them.
Each member has the following structure:
+--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -630,7 +826,7 @@ with no additional information before, between, or after them.

File: lzlib.info, Node: Examples, Next: Problems, Prev: Data format, Up: Top
-10 A small tutorial with examples
+11 A small tutorial with examples
*********************************
This chapter shows the order in which the library functions should be
@@ -709,15 +905,15 @@ Example 5: Multimember compression (MEMBER_SIZE < total output).
Example 6: Multimember compression (user-restarted members).
- 1) LZ_compress_open
+ 1) LZ_compress_open (with MEMBER_SIZE > largest member).
2) LZ_compress_write
3) LZ_compress_read
4) go back to step 2 until member termination is desired
5) LZ_compress_finish
6) LZ_compress_read
7) go back to step 6 until LZ_compress_member_finished returns 1
- 8) verify that LZ_compress_finished returns 1
- 9) go to step 12 if all input data have been written
+ 9) go to step 12 if all input data have been written and
+ LZ_compress_finished returns 1
10) LZ_compress_restart_member
11) go back to step 2
12) LZ_compress_close
@@ -750,7 +946,7 @@ next member in case of data error.

File: lzlib.info, Node: Problems, Next: Concept index, Prev: Examples, Up: Top
-11 Reporting bugs
+12 Reporting bugs
*****************
There are probably bugs in lzlib. There are certainly errors and
@@ -783,25 +979,29 @@ Concept index
* examples: Examples. (line 6)
* getting help: Problems. (line 6)
* introduction: Introduction. (line 6)
+* invoking: Invoking minilzip. (line 6)
* library version: Library version. (line 6)
+* options: Invoking minilzip. (line 6)
* parameter limits: Parameter limits. (line 6)

Tag Table:
Node: Top220
-Node: Introduction1303
-Node: Library version6115
-Node: Buffering6760
-Node: Parameter limits7980
-Node: Compression functions8939
-Node: Decompression functions15481
-Node: Error codes21651
-Node: Error messages23626
-Node: Data format24205
-Node: Examples26770
-Node: Problems30851
-Node: Concept index31423
+Node: Introduction1342
+Node: Library version6154
+Node: Buffering6799
+Node: Parameter limits8024
+Node: Compression functions8983
+Node: Decompression functions15592
+Node: Error codes21762
+Node: Error messages24064
+Node: Invoking minilzip24649
+Ref: --trailing-error25243
+Node: Data format31883
+Node: Examples34454
+Node: Problems38570
+Node: Concept index39142

End Tag Table