ARJ

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'''ARJ''' is a compressed archive format, and associated software. It was developed by Robert Jung.
 
'''ARJ''' is a compressed archive format, and associated software. It was developed by Robert Jung.
  
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== Discussion ==
 
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.).
 
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.).
  
== See also ==
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== Format details ==
* [[ARJ-PROTECT data]]
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* [[JAR (ARJ Software)]]
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* [[SARJ]]
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* [[SDN (SDN Project)]]
+
  
== Compression methods ==
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=== Compression methods ===
 
{| class="wikitable"
 
{| class="wikitable"
 
! ID !! Name !! Description
 
! ID !! Name !! Description
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The full identification algorithm used by the ARJ software is given in its technical documentation.
 
The full identification algorithm used by the ARJ software is given in its technical documentation.
 +
 +
== See also ==
 +
* [[ARJ-PROTECT data]]
 +
* [[JAR (ARJ Software)]]
 +
* [[SARJ]]
 +
* [[SDN (SDN Project)]]
  
 
== Specifications ==
 
== Specifications ==

Revision as of 17:39, 7 June 2022

File Format
Name ARJ
Ontology
Extension(s) .arj, .a01, ...
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.

Contents

Discussion

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.).

Format details

Compression methods

ID Name Description
0 stored No compression
1 compressed most LZ77+Huffman. For decompression purposes, these are all more-or-less compatible with LHA's "lh6" method.
2 ...
3 ...
4 compressed fastest LZ77
8 no data, no CRC
9 no data

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.

See also

Specifications

Software

Ed. note: Newer versions of unregistered ARJ/ARJ32 have a hard-coded expiration date, and may have a long delay when you run them (several minutes, if it's been a long time since expiration).

Sample files

Links

Personal tools
Namespaces

Variants
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