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Precomp
Fork note
This is an experimental fork of precomp, that uses the preflate library for deflate stream recompression.
What is Precomp?
Precomp is a command line precompressor. You can use it to achieve better compression on some file-/streamtypes (works on files and streams that are compressed with zLib or the Deflate compression method, bZip2, GIF, JPG and MP3). Precomp tries to decompress the streams, and if they can be decompressed and "re-"compressed so that they are bit-to-bit-identical with the original stream, the decompressed stream can be used instead of the compressed one.
The result is a .pcf file (PCF = PreCompressedFile) that contains more decompressed data than the original file. Note that this file is larger than the original file, but if you compress it with a compression method stronger than Deflate, the compression is better than before.
Since version 0.4.3, Precomp is available for Linux, too. The Linux and Windows versions are completely compatible, PCF files are exchangeable between Windows and Linux systems.
How can I contribute?
- You can have a look at the Issue list
- If you are looking for easy issues that don't require deeper understanding of the whole project, look for issues with the
low hanging fruitstag
- If you are looking for easy issues that don't require deeper understanding of the whole project, look for issues with the
- You can build the project or download the binaries (see below), run it on your system and report bugs or make enhancement proposals.
Releases/Binaries
Official GitHub releases for both Windows and Linux.
Alternative binary download of the latest official release for both Windows and Linux.
Binaries for older version can be found at this Google Drive folder.
Contact
Christian Schneider
Donations
To donate, you can either use the donate button on my homepage or send bitcoins to
1KvQxn6KHp4tv92Z5Fy8dTPLz4XdosQpbz
Credits
Thanks for support, help and comments:
- Stephan Busch (Squeeze Chart Author, http://www.squeezechart.com)
- Werner Bergmans (Maximum Compression Benchmark Author, http://www.maximumcompression.com)
- Matthias Stirner (packJPG, packMP3, https://github.com/packjpg, http://packjpg.encode.ru, http://www.matthiasstirner.com)
- Mark Adler (http://www.zlib.net)
- Matt Mahoney (http://www.mattmahoney.net)
- Malcolm Taylor (http://www.msoftware.co.nz)
- Simon Berger (helped to fix many bugs)
- The whole ENCODE.RU forum (http://encode.ru/forum)
Legal stuff
- packJPG v2.5k (https://github.com/packjpg/packJPG) by Matthias Stirner is used for compression/decompression of JPG files.
- packMP3 v1.0g by Matthias Stirner (http://packjpg.encode.ru/?page_id=19) by Matthias Stirner is used for compression/decompression of MP3 files.
- bZip2 1.0.6 (http://www.bzip.org) by Julian Seward is used for compression/decompression of bZip2 streams.
- zLib 1.2.11 (http://www.zlib.net) by Jean-loup Gailly and Mark Adler is used for compression/decompression of zLib streams.
- GifLib 4.1.4 (http://sourceforge.net/projects/giflib) is used for compression/decompression of GIF files. The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
- liblzma from XZ Utils 5.2.3 (http://tukaani.org/xz) is used for compression/decompresson of lzma streams.
License
Copyright 2006-2018 Christian Schneider
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.