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Merging upstream version 1.5~pre2.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-17 20:27:34 +01:00
parent 7220eb23eb
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Signed by: daniel
GPG key ID: FBB4F0E80A80222F
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README
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Description
Clzip is a lossless data compressor based on the LZMA algorithm, with
very safe integrity checking and a user interface similar to the one of
gzip or bzip2. Clzip decompresses almost as fast as gzip and compresses
better than bzip2, which makes it well suited for software distribution
and data archiving.
Clzip is a lossless data compressor with a user interface similar to the
one of gzip or bzip2. Clzip decompresses almost as fast as gzip and
compresses more than bzip2, which makes it well suited for software
distribution and data archiving. Clzip is a clean implementation of the
LZMA algorithm.
Clzip uses the same well-defined exit status values used by bzip2, which
makes it safer when used in pipes or scripts than compressors returning
ambiguous warning values, like gzip.
Clzip uses the same well-defined exit status values used by lzip and
bzip2, which makes it safer when used in pipes or scripts than
compressors returning ambiguous warning values, like gzip.
Clzip uses the lzip file format; the files produced by clzip are fully
compatible with lzip-1.4 or newer. Clzip is in fact a C language version
of lzip, intended for embedded devices or systems lacking a C++
compiler.
compatible with lzip-1.4 or newer, and can be rescued with lziprecover.
Clzip is in fact a C language version of lzip, intended for embedded
devices or systems lacking a C++ compiler.
The lzip file format is designed for long-term data archiving and
provides very safe integrity checking. The member trailer stores the
32-bit CRC of the original data, the size of the original data and the
size of the member. These values, together with the value remaining in
the range decoder and the end-of-stream marker, provide a 4 factor
integrity checking which guarantees that the decompressed version of the
data is identical to the original. This guards against corruption of the
compressed data, and against undetected bugs in clzip (hopefully very
unlikely). The chances of data corruption going undetected are
microscopic. Be aware, though, that the check occurs upon decompression,
so it can only tell you that something is wrong. It can't help you
recover the original uncompressed data.
If you ever need to recover data from a damaged lzip file, try the
lziprecover program.
lziprecover program. Lziprecover makes lzip files resistant to bit-flip
(one of the most common forms of data corruption), and provides data
recovery capabilities, including error-checked merging of damaged copies
of a file.
Clzip replaces every file given in the command line with a compressed
version of itself, with the name "original_name.lz". Each compressed
@ -50,18 +66,6 @@ without exceeding the given limit. Keep in mind that the decompression
memory requirement is affected at compression time by the choice of
dictionary size limit.
As a self-check for your protection, clzip stores in the member trailer
the 32-bit CRC of the original data, the size of the original data and
the size of the member. These values, together with the value remaining
in the range decoder and the end-of-stream marker, provide a very safe 4
factor integrity checking which guarantees that the decompressed version
of the data is identical to the original. This guards against corruption
of the compressed data, and against undetected bugs in clzip (hopefully
very unlikely). The chances of data corruption going undetected are
microscopic. Be aware, though, that the check occurs upon decompression,
so it can only tell you that something is wrong. It can't help you
recover the original uncompressed data.
Clzip implements a simplified version of the LZMA (Lempel-Ziv-Markov
chain-Algorithm) algorithm. The high compression of LZMA comes from
combining two basic, well-proven compression ideas: sliding dictionaries