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[Lzip-bug] Xlunzip 0.6 released

From: Antonio Diaz Diaz
Subject: [Lzip-bug] Xlunzip 0.6 released
Date: Fri, 26 Jun 2020 18:51:20 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14

I am pleased to announce the release of xlunzip 0.6.

Xlunzip is a test tool for the lzip decompression code of my lzip patch for linux. Xlunzip is similar to lunzip, but it uses the lzip_decompress linux module as a backend. Xlunzip tests the module for stream, buffer-to-buffer, and mixed decompression modes, including in-place decompression (using the same buffer for input and output). You can use xlunzip to verify that the module produces correct results when decompressing single member files, multimember files, or the concatenation of two or more compressed files. Xlunzip can be used with unzcrash to test the robustness of the module to the decompression of corrupted data.

The distributed index feature of the lzip format allows xlunzip to decompress concatenated files in place. This can't be guaranteed to work with formats like gzip or bzip2 because they can't detect whether a high compression ratio in the first members of the multimember data is being masked by a low compression ratio in the last members.

The xlunzip tarball contains a copy of the lzip_decompress module and can be compiled and tested without downloading or applying the patch to the kernel.

The homepage is at http://www.nongnu.org/lzip/xlunzip.html

The sources can be downloaded from http://download.savannah.gnu.org/releases/lzip/xlunzip/

The sha256sum is:
4b7ce616305671dcbf6907c2c78cab8d140f0297a48afc9813f5aedbb9f7349a xlunzip-0.6.tar.lz

The lzip patch for linux can be found at http://download.savannah.gnu.org/releases/lzip/kernel/

Changes in version 0.6:

* Option '-o, --output' now behaves like '-c, --stdout', but sending the output unconditionally to a file instead of to standard output. See the new description of '-o' in the man page. This change is not backwards compatible. Therefore commands like:
  xlunzip -d -o foo - bar.lz < foo.lz
must now be split into:
  xlunzip -d -o foo - < foo.lz
  xlunzip -d bar.lz
or rewritten as:
  xlunzip -d - bar.lz < foo.lz > foo

* In-place decompression of concatenated files should now work for any combination of files as long as they fit in memory and their total decompressed size is smaller than LONG_MAX minus a small extra space.

* The README file now includes an analysis of the amount of memory required for in-place decompression.

Please send bug reports and suggestions to lzip-bug@nongnu.org

Antonio Diaz, xlunzip author and maintainer.
Self-determination is a human right. Free Catalan political prisoners.
If you care about interoperability and long-term archiving, please help me replace xz with lzip. See http://www.nongnu.org/lzip/lzip_benchmark.html#xz1
http://www.nongnu.org/lzip/manual/lzip_manual.html#Quality-assurance and
http://www.nongnu.org/lzip/xz_inadequate.html Thanks.

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