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Diffstat (limited to 'doc/tarlz.info')
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1 files changed, 54 insertions, 25 deletions
diff --git a/doc/tarlz.info b/doc/tarlz.info index 7f90766..bf1e1f5 100644 --- a/doc/tarlz.info +++ b/doc/tarlz.info @@ -11,7 +11,7 @@ File: tarlz.info, Node: Top, Next: Introduction, Up: (dir) Tarlz Manual ************ -This manual is for Tarlz (version 0.9, 22 January 2019). +This manual is for Tarlz (version 0.10, 31 January 2019). * Menu: @@ -120,6 +120,13 @@ archive 'foo'. the archive if no FILES have been specified. Tarlz can't concatenate uncompressed tar archives. +'-B BYTES' +'--data-size=BYTES' + Set target size of input data blocks for the '--bsolid' option. + Valid values range from 8 KiB to 1 GiB. Default value is two times + the dictionary size, except for option '-0' where it defaults to + 1 MiB. + '-c' '--create' Create a new archive from FILES. @@ -190,6 +197,18 @@ archive 'foo'. members it creates, reducing the amount of memory required for decompression. + 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 + '--asolid' When creating or appending to a compressed archive, use appendable solid compression. All the files being added to the archive are @@ -197,6 +216,15 @@ archive 'foo'. are compressed into a separate lzip member. This creates a solidly compressed appendable archive. +'--bsolid' + When creating or appending to a compressed archive, compress tar + members together in a lzip member until they approximate a target + uncompressed size. The size can't be exact because each solidly + compressed data block must contain an integer number of tar + members. This option improves compression efficiency for archives + with lots of small files. *Note --data-size::, to set the target + block size. + '--dsolid' When creating or appending to a compressed archive, use solid compression for each directory especified in the command line. The @@ -560,13 +588,13 @@ old tar programs from extracting the extended records as a file in the wrong place. Tarlz also sets to zero those fields of the ustar header overridden by extended records. - If the extended header is needed because of a file size larger than -8 GiB, the size field will be unable to contain the full size of the -file. Therefore the file may be partially extracted, and the tool will -issue a spurious warning about a corrupt header at the point where it -thinks the file ends. Setting to zero the overridden size in the ustar -header at least prevents the partial extraction and makes obvious that -the file has been truncated. + If an extended header is required for any reason (for example a file +size larger than 8 GiB or a link name longer than 100 bytes), tarlz +moves the filename also to the extended header to prevent an ustar tool +from trying to extract the file or link. This also makes easier during +parallel extraction or listing the detection of a tar member split +between two lzip members at the boundary between the extended header +and the ustar header. 4.3 As simple as possible (but not simpler) @@ -626,10 +654,10 @@ to single-threaded mode and continues decoding the archive. Currently only the '--list' option is able to do multi-threaded decoding. If the files in the archive are large, multi-threaded '--list' on a -regular tar.lz archive can be hundreds of times faster than sequential -'--list' because, in addition to using several processors, it only -needs to decompress part of each lzip member. See the following example -listing the Silesia corpus on a dual core machine: +regular (seekable) tar.lz archive can be hundreds of times faster than +sequential '--list' because, in addition to using several processors, +it only needs to decompress part of each lzip member. See the following +example listing the Silesia corpus on a dual core machine: tarlz -9 -cf silesia.tar.lz silesia time lzip -cd silesia.tar.lz | tar -tf - (5.032s) @@ -690,9 +718,9 @@ Example 7: Extract files 'a' and 'c' from archive 'archive.tar.lz'. Example 8: Copy the contents of directory 'sourcedir' to the directory -'targetdir'. +'destdir'. - tarlz -C sourcedir -c . | tarlz -C targetdir -x + tarlz -C sourcedir -c . | tarlz -C destdir -x File: tarlz.info, Node: Problems, Next: Concept index, Prev: Examples, Up: Top @@ -734,17 +762,18 @@ Concept index Tag Table: Node: Top223 -Node: Introduction1012 -Node: Invoking tarlz3124 -Node: File format10384 -Ref: key_crc3215169 -Node: Amendments to pax format20586 -Ref: crc3221110 -Ref: flawed-compat22135 -Node: Multi-threaded tar24508 -Node: Examples27012 -Node: Problems28682 -Node: Concept index29208 +Node: Introduction1013 +Node: Invoking tarlz3125 +Ref: --data-size4717 +Node: File format11536 +Ref: key_crc3216321 +Node: Amendments to pax format21738 +Ref: crc3222262 +Ref: flawed-compat23287 +Node: Multi-threaded tar25649 +Node: Examples28164 +Node: Problems29830 +Node: Concept index30356 End Tag Table |