ARJ

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* [[JAR (ARJ Software)]]
 
* [[JAR (ARJ Software)]]
 
* [[SDN (SDN Project)]]
 
* [[SDN (SDN Project)]]
 +
 +
== Compression methods ==
 +
{| class="wikitable"
 +
! ID !! Name !! Description
 +
|-
 +
|0 || stored || No compression
 +
|-
 +
|1 || compressed most ||rowspan="3"| [[LZ77 with Huffman coding|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 {{magic|0x60 0xea}}.
 +
 +
The full identification algorithm used by the ARJ software is given in its technical documentation.
  
 
== Specifications ==
 
== Specifications ==
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** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/ARJ241A.EXE|v2.41a}} (1993-07-10)
 
** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/ARJ241A.EXE|v2.41a}} (1993-07-10)
 
** {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/ARCERS/ARJ250A.EXE|v2.50a}} (1995-12-12)
 
** {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/ARCERS/ARJ250A.EXE|v2.50a}} (1995-12-12)
 +
** [http://www.filegate.net/compress/arj271.exe v2.71] (1999-12-19)
 
** [https://www.sac.sk/download/pack/arj286.exe v2.86] (2012-01-02)
 
** [https://www.sac.sk/download/pack/arj286.exe v2.86] (2012-01-02)
 
* ARJ32 - Official compression/decompression software for Windows console
 
* ARJ32 - Official compression/decompression software for Windows console
** [https://www.sac.sk/download/pack/arj32320.exe ARJ32 v3.20]
+
** [http://www.filegate.net/compress/arj32v3j.exe v3.04] (1999-12-19)
 +
** [https://www.sac.sk/download/pack/arj32320.exe v3.20] (2012-01-02)
 
* UNARJ - Official software, decompression only
 
* UNARJ - Official software, decompression only
 
** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/UNARJ241.ZIP|v2.41}} (1993-04) - Source code + DOS binary
 
** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/UNARJ241.ZIP|v2.41}} (1993-04) - Source code + DOS binary
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* [http://arj.sourceforge.net/ Open-source ARJ]
 
* [http://arj.sourceforge.net/ Open-source ARJ]
 
* [[Konvertor]]
 
* [[Konvertor]]
 +
 +
''Ed. note: Some newer versions of ARJ/ARJ32 have a long delay (2 minutes?) when you run them.''
  
 
== Sample files ==
 
== Sample files ==
 
* {{CdTextfilesURL|20mnn/HPTEXT/PHRACK/}}
 
* {{CdTextfilesURL|20mnn/HPTEXT/PHRACK/}}
 
* {{CdTextfiles|silvercollection/|The Silver Collection}} CDs have many ARJ files
 
* {{CdTextfiles|silvercollection/|The Silver Collection}} CDs have many ARJ files
 +
* {{CdTextfilesURL|goldmedal/}}
  
 
== Links ==
 
== Links ==
 
* [[Wikipedia:ARJ|Wikipedia article]]
 
* [[Wikipedia:ARJ|Wikipedia article]]

Revision as of 14:22, 18 October 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.).

See also:

Contents

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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Variants
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