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Diffstat (limited to 'README')
| -rw-r--r-- | README | 24 |
1 files changed, 13 insertions, 11 deletions
@@ -1,13 +1,15 @@ Description Tarlz is a massively parallel (multi-threaded) combined implementation of -the tar archiver and the lzip compressor. Tarlz creates, lists, and extracts -archives in a simplified and safer variant of the POSIX pax format -compressed with lzip, keeping the alignment between tar members and lzip -members. The resulting multimember tar.lz archive is fully backward -compatible with standard tar tools like GNU tar, which treat it like any -other tar.lz archive. Tarlz can append files to the end of such compressed -archives. +the tar archiver and the lzip compressor. Tarlz uses the compression library +lzlib. + +Tarlz creates tar archives using a simplified and safer variant of the POSIX +pax format compressed in lzip format, keeping the alignment between tar +members and lzip members. The resulting multimember tar.lz archive is fully +backward compatible with standard tar tools like GNU tar, which treat it +like any other tar.lz archive. Tarlz can append files to the end of such +compressed archives. Keeping the alignment between tar members and lzip members has two advantages. It adds an indexed lzip layer on top of the tar archive, making @@ -16,7 +18,7 @@ amount of data lost in case of corruption. Compressing a tar archive with plzip may even double the amount of files lost for each lzip member damaged because it does not keep the members aligned. -Tarlz can create tar archives with five levels of compression granularity; +Tarlz can create tar archives with five levels of compression granularity: per file (--no-solid), per block (--bsolid, default), per directory (--dsolid), appendable solid (--asolid), and solid (--solid). It can also create uncompressed tar archives. @@ -40,8 +42,8 @@ archive, but it has the following advantages: lziprecover can be used to recover some of the damaged members. * A multimember tar.lz archive is usually smaller than the corresponding - solidly compressed tar.gz archive, except when compressing files - smaller than about 32 KiB individually. + solidly compressed tar.gz archive, except when individually + compressing files smaller than about 32 KiB. Note that the POSIX pax format has a serious flaw. The metadata stored in pax extended records are not protected by any kind of check sequence. @@ -85,7 +87,7 @@ tar.lz +===============+=================================================+========+ -Copyright (C) 2013-2020 Antonio Diaz Diaz. +Copyright (C) 2013-2021 Antonio Diaz Diaz. This file is free documentation: you have unlimited permission to copy, distribute, and modify it. |