ARJ

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|[[File Formats]]
 
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|[[Electronic File Formats]]
 
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|[[Compression]]
 
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|[[ARJ]]
 
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{{FormatInfo
 
{{FormatInfo
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|subcat=Archiving
 
|extensions={{ext|arj}}
 
|extensions={{ext|arj}}
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|pronom={{PRONOM|fmt/610}}
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|wikidata={{wikidata|Q2693033}}
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|released=1990 (beta), 1991 (v1.00)
 
}}
 
}}
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'''ARJ''' is a compressed archive format, and associated software. It was developed by Robert Jung.
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ARJ was one of the leading compression tools during the 1990s. While it was a bit slower than [[ZIP|PKZIP]], it sported many more options, some of which were unique during that time (archives over multiple disks/volumes, fine-tuning of the compression algorithms used based on the data that was being compressed, recovery records to recover from simple transmission errors, etc.).
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== See also ==
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* [[JAR (ARJ Software)]]
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* [[SARJ]]
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* [[SDN (SDN Project)]]
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== Compression methods ==
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{| class="wikitable"
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! ID !! Name !! Description
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|-
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|0 || stored || No compression
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|-
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|1 || compressed most ||rowspan="3"| [[LZ77 with Huffman coding|LZ77+Huffman]]. These are all more-or-less compatible with [[LHA]]'s "lh6" method.
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|-
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|2 || ...
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|-
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|3 || ...
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|-
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|4 || compressed fastest || [[LZ77]]
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|-
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|8 || no data, no CRC || (whatever that means)
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|-
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|9 || no data || (whatever that means)
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|}
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== Identification ==
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An ARJ archive starts with signature bytes {{magic|0x60 0xea}}.
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The full identification algorithm used by the ARJ software is given in its technical documentation.
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== Specifications ==
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* The ARJ/UNARJ distributions include detailed format information, in a file named TECHNOTE.TXT or similar.
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** [https://github.com/FarGroup/FarManager/blob/master/plugins/multiarc/arc.doc/arj.txt A copy of the 2001-09 version] (with an addendum of some sort)
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* [http://www.fileformat.info/format/arj/corion.htm The ARJ Archive File Format], from fileformat.info and Corion.net
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== Software ==
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* [http://www.arjsoftware.com/ Official homepage of ARJ software]
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* ARJ - Official compression/decompression software for DOS
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** {{CdTextfiles|nightowl/carrs/015A/ARJ013A.ZIP|v0.13a}} (1990-09-29)
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** {{CdTextfiles|hof91/ARC/ARJ100.LZH|v1.00}} (1991-02-07)
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** {{CdTextfiles|pier/pier01/001a/arj230.exe|v2.30}} (1992-01-19)
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** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/ARJ241A.EXE|v2.41a}} (1993-07-10)
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** {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/ARCERS/ARJ250A.EXE|v2.50a}} (1995-12-12)
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** [http://www.filegate.net/compress/arj271.exe v2.71] (1999-12-19)
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** [https://www.sac.sk/download/pack/arj286.exe v2.86] (2012-01-02)
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* ARJ32 - Official compression/decompression software for Windows console
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** [http://www.filegate.net/compress/arj32v3j.exe v3.04] (1999-12-19)
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** [https://www.sac.sk/download/pack/arj32320.exe v3.20] (2012-01-02)
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* UNARJ - Official software, decompression only
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** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/UNARJ241.ZIP|v2.41}} (1993-04) - Source code + DOS binary
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** [https://www.sac.sk/download/pack/unarj265.exe v2.65] (2002-06) - Source code + DOS binary + Windows console binary
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* [[7-Zip]]
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* [http://arj.sourceforge.net/ Open-source ARJ]
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* [[Konvertor]]
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''Ed. note: Some newer versions of ARJ/ARJ32 have a long delay (2 minutes?) when you run them.''
  
==Overview==
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== Sample files ==
ARJ was one of the leading compression tools during the nineties. While it was a bit slower than PkZIP, it sported many more options, some of which were unique during that time (archives over multiple disks/volumes, finetuning of the compression algorithms used based on the data that was being compressed, recovery records to recover from simple transmission errors, etc.)
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* {{CdTextfilesURL|20mnn/HPTEXT/PHRACK/}}
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* {{CdTextfiles|silvercollection/|The Silver Collection}} CDs have many ARJ files
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* {{CdTextfilesURL|goldmedal/}}
  
==Resources==
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== Links ==
* official homepage of ARJ software[http://www.arjsoftware.com/]
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* [[Wikipedia:ARJ|Wikipedia article]]
* Wikipedia page on ARJ[http://en.wikipedia.org/wiki/ARJ]
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* Page on fileformat.info[http://www.fileformat.info/format/arj/corion.htm]
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* Open-Source implementation of an ARJ compressor/decompressor[http://arj.sourceforge.net/]
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Revision as of 13:22, 12 December 2020

File Format
Name ARJ
Ontology
Extension(s) .arj
PRONOM fmt/610
Wikidata ID Q2693033
Released 1990 (beta), 1991 (v1.00)

ARJ is a compressed archive format, and associated software. It was developed by Robert Jung.

ARJ was one of the leading compression tools during the 1990s. While it was a bit slower than PKZIP, it sported many more options, some of which were unique during that time (archives over multiple disks/volumes, fine-tuning of the compression algorithms used based on the data that was being compressed, recovery records to recover from simple transmission errors, etc.).

Contents

See also

Compression methods

ID Name Description
0 stored No compression
1 compressed most LZ77+Huffman. These are all more-or-less compatible with LHA's "lh6" method.
2 ...
3 ...
4 compressed fastest LZ77
8 no data, no CRC (whatever that means)
9 no data (whatever that means)

Identification

An ARJ archive starts with signature bytes 0x60 0xea.

The full identification algorithm used by the ARJ software is given in its technical documentation.

Specifications

Software

Ed. note: Some newer versions of ARJ/ARJ32 have a long delay (2 minutes?) when you run them.

Sample files

Links

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Namespaces

Variants
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