rzip
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Compression program to use long distance redundancies in files

A compression program able to take advantage of long distance
redundancies in files, allowing greater compression ratios. rzip uses
a history buffer of up to 900MB, while gzip uses 32KB and bzip2 uses
900KB. rzip cannot read from the standard input or write to the
standard output.

A large buffer means it can find matching pieces of the input file
over huge distances compared to other commonly used compression
programs. The gzip program by comparison uses a history buffer of 32
kbyte and bzip2 uses a history buffer of 900 kbyte. The second
advantage of rzip over bzip2 is that it is usually faster.

The disadvantages are that you can't pipeline rzip (so it can't read
from standard input or write to standard output), and that it uses
lots of memory. A typical compression run on a large file might use a
couple of hundred MB of ram. If you have ram to burn and want the best
possible compression rate then rzip is probably for you, otherwise
stick with bzip2 or gzip.

See article "Which Zip Is Right For You?" by Jeremy Zawodny for
comparison (rzip could compress 8:1)
http://www.linux-mag.com/2004-06/diy_01.html

In the following are the compression ratios of the large-corpus for
rzip 2.0, gzip 1.3.5 and bzip2 1.0.2. In all cases the programs were
run with their maximum compresion options:

    File Name               rzip    gzip    bzip2
    large-corpus/archive    6.03    3.64    4.97
    large-corpus/emacs      5.08    3.66    4.62
    large-corpus/linux      5.54    4.24    5.23
    large-corpus/samba      9.55    3.50    4.78
    large-corpus/spamfile   29.95   8.43    14.23

Runtime requirements:
  cygwin
  libbz2_1

Build requirements:
  cygwin
  libbz2-devel

Canonical homepage:
  http://rzip.samba.org
  http://packages.debian.org/rzip

Canonical download:
  http://rzip.samba.org/ftp/rzip
  http://packages.debian.org/rzip

Version control repository:
  cvs -d :pserver:cvs@pserver.samba.org:/cvsroot co rzip

Mailing list:

Forum / Wiki:

IRC channel:

Upstream contact:
  Author: Andrew Tridgell <rzip at tridgell.net>
  Bugs: <bugs-rzip at tridgell.net>

License:
  GPL

Language:
  C

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Build instructions:
  unpack rzip-2.1-1-src.tar.bz2
    if you use setup to install this src package, it will be
    unpacked under /usr/src automatically
  cd /usr/src
  ./rzip*.sh all

This will create:
  rzip-2.1-1.tar.bz2
  rzip-2.1-1-src.tar.bz2

-------------------------------------------

Files included in the binary distro:

/usr/bin/rzip.exe
/usr/share/doc/Cygwin/rzip-2.1.README
/usr/share/doc/rzip-2.1/COPYING
/usr/share/man/man1/rzip.1.gz

------------------

Port Notes:

----- version 2.1-1 -----
- Initial release 2007-12-20 Jari Aalto

Cygwin port maintained by: Jari Aalto <jari.aalto at cante.net>
Copyright (C) 2007 Jari Aalto; Licenced under GPL v2 or later