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Merging upstream version 1.6~rc1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-23 19:20:27 +01:00
parent 4d14b4402a
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Signed by: daniel
GPG key ID: FBB4F0E80A80222F
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README
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@ -6,17 +6,50 @@ the one of lzip, bzip2 or gzip.
Pdlzip uses the lzip file format; the files produced by pdlzip are
(hope)fully compatible with lzip-1.4 or newer. Pdlzip is in fact a
"public domain" version of the lzip data compressor, intended for those
who can't distribute GPL licensed Free Software.
who can't distribute (or even use) GPL licensed Free Software.
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 lziprecover program 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 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.
Pdlzip is also able to decompress legacy lzma-alone (.lzma) files.
Lzma-alone is a very bad format. If you keep any lzma-alone files, it is
advisable to recompress them to lzip format.
Pdlzip is written in C.
Pdlzip includes public domain compression code from the LZMA SDK written
by Igor Pavlov.
Pdlzip includes public domain (de)compression code from the LZMA SDK
(Software Development Kit) written by Igor Pavlov.
I would not write non-copylefted software unless it is too simple to be
worth copylefting it, but one of the uses of the lzip format is the
interchange of information, and it is therefore desirable that even the
users of the most non-free platforms can share lzip files with everybody
else.
Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
Copyright (C) 2010-2015 Antonio Diaz Diaz.
This file is free documentation: you have unlimited permission to copy,
distribute and modify it.