ARJ

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|1 || compressed most ||rowspan="3"| [[LZ77]]+[[Huffman coding|Huffman]]. These are all more-or-less compatible with [[LHA]]'s "lh6" method.
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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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Latest 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

[edit] 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)

[edit] 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.

[edit] Specifications

[edit] Software

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

[edit] Sample files

[edit] Links

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