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Merging upstream version 1.15~rc1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-20 21:34:58 +01:00
parent 5fdbdd44aa
commit ae3eafc693
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
27 changed files with 724 additions and 791 deletions
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32
README
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@ -5,30 +5,6 @@ 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 and is distributed under a 2-clause BSD license.
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.
A nice feature of the lzip format is that a corrupt byte is easier to repair
the nearer it is from the beginning of the file. Therefore, with the help of
lziprecover, losing an entire archive just because of a corrupt byte near
the beginning is a thing of the past.
The functions and variables forming the interface of the compression library
are declared in the file 'lzlib.h'. Usage examples of the library are given
in the files 'bbexample.c', 'ffexample.c', and 'minilzip.c' from the source
@ -74,10 +50,10 @@ In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not a
concrete algorithm; it is more like "any algorithm using the LZMA coding
scheme". For example, the option '-0' of lzip uses the scheme in almost the
simplest way possible; issuing the longest match it can find, or a literal
byte if it can't find a match. Inversely, a much more elaborated way of
finding coding sequences of minimum size than the one currently used by lzip
could be developed, and the resulting sequence could also be coded using the
LZMA coding scheme.
byte if it can't find a match. Inversely, a more elaborate way of finding
coding sequences of minimum size than the one currently used by lzip could
be developed, and the resulting sequence could also be coded using the LZMA
coding scheme.
Lzlib currently implements two variants of the LZMA algorithm: fast (used by
option '-0' of minilzip) and normal (used by all other compression levels).