https://github.com/darealshinji/dzip

Personal mirror and playground for DZip
https://github.com/darealshinji/dzip

compression

Last synced: about 1 month ago
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Personal mirror and playground for DZip

• Host: GitHub
• URL: https://github.com/darealshinji/dzip
• Owner: darealshinji
• License: other
• Created: 2015-02-11T05:22:01.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2017-02-06T14:49:25.000Z (over 8 years ago)
• Last Synced: 2025-06-17T08:03:38.736Z (4 months ago)
• Topics: compression
• Language: C
• Homepage: http://quake.speeddemosarchive.com/dzip/
• Size: 189 KB
• Stars: 2
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README
  • License: COPYING

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README

          
Dzip is a compression program with the special purpose of compressing

Quake .dem files. More information on dzip can be found at

http://quake.speeddemosarchive.com/dzip/

Dzip was originally written by Stefan Schwoon  and

has since been updated and expanded by Nolan Pflug .

Dzip makes use of the zlib library copyrighted by Jean-loup Gailly

(gailly.net) and Mark Adler (www.alumni.caltech.edu/~madler). More

information on zlib can be found at the zlib home page at

http://www.zlib.org/   The source download includes the zlib files, they

have been slightly modified from the original version.  All changes are

marked with a comment containing "Dzip" and all were made just to

reduce program size by a little bit.

Compilation instructions:

First run `./autogen.sh`. Then a `./configure && make` should build the program.

See `./configure --help` for more options. To install run `make install`.

There are no special build dependencies, the GNU compilers and automake is all

you need. On Ubuntu or Debian you can install everything you need with

`sudo apt-get install build-essential automake`.

Technical information:

Dzip's demo compression operates in two stages. The first stage takes a

demo  file and converts it into some intermediate format. The second stage

applies standard zip compression (making use of zlib) to the intermediate

format.

The objective of the first stage is therefore to produce an intermediate

format such as can be compressed well by the second stage. Loosely speaking,

the first stage removes entropy from the .dem file format. I won't go into

the details of the first stage here, but if you're interested, make sure

to look in encode.c.

Copyright notice:

 (C) 2000-2002 Stefan Schwoon, Nolan Pflug

  This software is provided 'as-is', without any express or implied

  warranty. In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

  Stefan Schwoon	Nolan Pflug

  schwoon@in.tum.de	radix@planetquake.com