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[Lzip-bug] Lzlib 1.12-rc1 released
Antonio Diaz Diaz
[Lzip-bug] Lzlib 1.12-rc1 released
Tue, 09 Jun 2020 13:08:19 +0200
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Lzlib 1.12-rc1 is ready for testing here
The sha256sums are:
Please, test it and report any bugs you find.
Lzlib is a data compression library providing in-memory LZMA compression and
decompression functions, including integrity checking of the decompressed
data. The compressed data format used by the library is the lzip format.
Lzlib is written in C.
The lzip file format is designed for data sharing and long-term archiving,
taking into account both data integrity and decoder availability:
* The lzip format provides very safe integrity checking and some data
recovery means. The program lziprecover 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.
* The lzip format is as simple as possible (but not simpler). The lzip
manual provides the source code of a simple decompressor along with a
detailed explanation of how it works, so that with the only help of the
lzip manual it would be possible for a digital archaeologist to extract
the data from a lzip file long after quantum computers eventually
render LZMA obsolete.
* Additionally the lzip reference implementation is copylefted, which
guarantees that it will remain free forever.
The homepage is at http://www.nongnu.org/lzip/lzlib.html
Changes in this version:
* If end of file is found at member trailer or EOS marker,
'LZ_decompress_errno' now returns 'LZ_unexpected_eof' instead of
* Decompression speed has been slightly increased.
* A bug has been fixed in minilzip that falsely reported a library stall
when decompressing a file with empty members.
* Minilzip now reports an error if a file name is empty (minilzip -t "").
* 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 manual. This change is not backwards compatible.
Therefore commands like:
minilzip -o foo.lz - bar < foo
must now be split into:
minilzip -o foo.lz - < foo
or rewritten as:
minilzip - bar < foo > foo.lz
* When using '-c' or '-o', minilzip now checks whether the output is a
terminal only once.
* The words 'decompressed' and 'compressed' have been replaced with the
shorter 'out' and 'in' in the verbose output of minilzip when decompressing
* It has been documented in the manual that 'LZ_(de)compress_close' and
'LZ_(de)compress_errno' can be safely called with a null argument.
* It has been documented in the manual that the LZMA marker '3' ("Sync
Flush" marker) is not allowed in lzip files. Marker '3' is a device for
interactive communication between applications using lzlib, but is useless
and wasteful in a file, and is excluded from the media type
'application/lzip'. The LZMA marker '2' ("End Of Stream" marker) is the only
marker allowed in lzip files.
* It has been documented in the manual that not calling
'LZ_decompress_finish' prevents lzlib from detecting a truncated member.
* It has been documented in the manual that 'LZ_decompress_read' returns
at least once per member so that 'LZ_decompress_member_finished' can be
called (and trailer data retrieved) for each member, even for empty members.
Therefore, 'LZ_decompress_read' returning 0 does not mean that the end of
the stream has been reached.
* Real code examples for the most common uses of the library have been
added to the tutorial.
* 'bbexample.c' has been simplified to not use 'LZ_(de)compress_write_size'.
* 'lzcheck.c' now also tests member by member decompression without
intermediate calls to 'LZ_decompress_finish'.
* The new file 'ffexample.c', containing example functions for
file-to-file compression/decompression, has been added to the distribution.
* The commands needed to extract files from a tar.lz archive have been
documented in the output of 'minilzip --help' and in the man page.
* 'make install-bin' no longer installs the minilzip man page. This is to
prevent 'make install-bin install-man-compress' from installing the man page
twice before compressing it.
* The new targets 'install-bin-compress' and
'install-bin-strip-compress', which install a (stripped) minilzip and a
compressed man page, have been added to the Makefile.
* 9 new test files have been added to the testsuite.
Antonio Diaz, lzlib author and maintainer.
Self-determination is a human right. Free Catalan political prisoners.
If you care about long-term archiving, please help me replace xz with lzip.
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