[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Lzip-bug] Tarlz 0.7 released
Antonio Diaz Diaz
[Lzip-bug] Tarlz 0.7 released
Sun, 25 Nov 2018 23:14:57 +0100
Mozilla/5.0 (X11; U; Linux i586; en-US; rv:188.8.131.52) Gecko/20110420 SeaMonkey/2.0.14
I am pleased to announce the release of tarlz 0.7.
Tarlz is a small and simple implementation of the tar archiver. By
default tarlz creates, lists and extracts archives in a simplified posix
pax format compressed with lzip on a per file basis. Each tar member is
compressed in its own lzip member, as well as the end-of-file blocks.
This method is fully backward compatible with standard tar tools like
GNU tar, which treat the resulting multimember tar.lz archive like any
other tar.lz archive. Tarlz can append files to the end of such
Tarlz can create tar archives with four levels of compression
granularity; per file, per directory, appendable solid, and solid.
Of course, compressing each file (or each directory) individually is
less efficient than compressing the whole tar archive, but it has the
* The resulting multimember tar.lz archive can be decompressed in
parallel with plzip, multiplying the decompression speed.
* New members can be appended to the archive (by removing the EOF
member) just like to an uncompressed tar archive.
* It is a safe posix-style backup format. In case of corruption,
tarlz can extract all the undamaged members from the tar.lz
archive, skipping over the damaged members, just like the standard
(uncompressed) tar. Moreover, the option '--keep-damaged' can be
used to recover as much data as possible from each damaged member,
and 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
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.
Because of this, tarlz protects the extended records with a CRC in a way
compatible with standard tar tools.
The homepage is at http://www.nongnu.org/lzip/tarlz.html
An online manual for tarlz can be found at
The sources can be downloaded from
The sha256sum is:
Changes in version 0.7:
* The new option '--keep-damaged', which keeps the partial data when
a decompression error happens while extracting a file, has been added.
It requires lzlib 1.11-rc2 or newer in order to recover as much data as
possible from each damaged member.
* The new option '--no-solid' has been added. It allows tarlz revert
to default behavior if, for example, tarlz is invoked through an alias
like tar='tarlz --solid'.
* '-c, --create' and '-r, --append' now minimize the dictionary size
of the lzip members created.
* Tarlz now detects when the archive being created or enlarged is
among the files to be dumped, appended or concatenated, and skips it.
* The option '-V, --version' now shows the version of lzlib being used.
Please send bug reports and suggestions to address@hidden
Antonio Diaz, tarlz author and maintainer.
Software and Catalan political prisoners just want to be free.
If you are distributing software in xz format, please consider using
lzip instead. See http://www.nongnu.org/lzip/lzip_benchmark.html#xz1 and
|[Prev in Thread]
||[Next in Thread]|
- [Lzip-bug] Tarlz 0.7 released,
Antonio Diaz Diaz <=