World Library  
Flag as Inappropriate
Email this Article

FreeArc

Article Id: WHEBN0024014959
Reproduction Date:

Title: FreeArc  
Author: World Heritage Encyclopedia
Language: English
Subject: ARJ, Blu-code, OpenH264, JAR (software), Zipeg
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

FreeArc

freearc
Developer(s) Bulat Ziganshin
Stable release 0.666 / May 20, 2010 (2010-05-20)
Development status Stalled
Written in Haskell, C++, C
Operating system Microsoft Windows, GNU/Linux
Platform IA-32
Type File archiver
License GNU GPLv2+[1]
Website freearc.org

FreeArc is a free and open source file archiver developed by Bulat Ziganshin. FreeArc Next, which is a native 64bit archiver rewritten from scratch, is currently under development.[2]

Algorithms

FreeArc uses LZMA, PPMD, TrueAudio, Tornado and GRzip algorithms with automatic switching by file type. Additionally, it uses filters to further improve compression, including REP (finds repetitions at the distances up to 1gb), DICT (dictionary replacements for texts), DELTA (improves compression of tables in binary data), BCJ (executables preproccesor) and LZP (removes repetitions in texts).[3]

Benchmarks

Archive size

In a 2010 Tom's Hardware benchmarks comparing it to the other popular archivers WinZip, 7-Zip, and WinRAR, FreeArc narrowly outperformed them by small margin in its "best compression" mode, but lost to 7-Zip's LZMA2 in the "default compression" tests, still compressing better than WinRAR and WinZip at this setting.[4]

Speed

In the same Tom's Hardware tests, FreeArc was outpaced at default settings by 7zip's LZMA2 default compression, and also by WinRAR, even at its best compression settings. FreeArc's compression at its best settings was slower than both 7zip and WinRAR, but still came ahead of WinZip.[4]

Efficiency

In a metric devised by Werner Bergmans of Maximum Compression Benchmark, FreeArc compression is more efficient than programs for classic formats like .Z (LZW), .zip (Deflate), .gz or bzip2. (The scoring formula used in this non-public test,

\text{score}_X = \text{time}_X \times 2^{10(\frac{\text{size}_X}{\text{size}_{\text{TOP}}} - 1)}

multiplies the sum of compression and decompression times with a factor that exponentially grades the ratio of archive sizes achieved by the program under test relative to the best known archive size for that data set.) As of November 2010, FreeArc is the top program in this benchmark, followed by NanoZip, bsc and WinRAR.[5] It works faster than WinRAR and 7zip.[6]

Features

Like RAR and ZIP it is an archiver. It is not just a data compressor like gzip or bzip2. Initially it supported only its own archive format, normally identified by the .arc file name extension, incompatible with others;[3] there's no relationship with other .arc formats. More recently, decompression support for other archive types has been added as well, including zip, rar, and 7z. FreeArc has both a command line interface and a GUI.[6] Other features include:

  • Solid compression with "smart updates" which avoid recompression when possible
  • AES/Blowfish/Twofish/Serpent encryption,[3] including chaining of encryption algorithms
  • FAR and Total Commander plugins
  • Ability to create self-extracting archives and installers
  • Archive protection and recovery layer using Reed-Solomon error correction with user-defined size (for example, recovery over Internet being 0.1%, while default is autosize 1-4%).

Supported platforms

Windows binaries are available from the developer. There was no 64-bit version as of January 2012, but may change as the program had not left its alpha stage of development yet.[7]

Linux binaries and source code are not available anymore.

See also

References

  1. ^
  2. ^ http://encode.ru/threads/2166-FreeArc-Next
  3. ^ a b c Patrick Schmid, Achim Roos, (March 10, 2010) 7-Zip 9.1 Beta And FreeArc 0.60, Tom's Hardware
  4. ^ a b http://www.tomshardware.com/reviews/archive-zip-compression,2572-6.html
  5. ^
  6. ^ a b , golem.de
  7. ^

External links

  • The FreeArc home page
  • FreeArc project at SourceForge (abandoned)
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.