ARJ
From Just Solve the File Format Problem
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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]]+[[Huffman coding|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 == | == Identification == | ||
| Line 49: | Line 68: | ||
* {{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 15:16, 27 August 2020
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
- The ARJ/UNARJ distributions include detailed format information, in a file named TECHNOTE.TXT or similar.
- A copy of the 2001-09 version (with an addendum of some sort)
- The ARJ Archive File Format, from fileformat.info and Corion.net
Software
- Official homepage of ARJ software
- ARJ - Official compression/decompression software for DOS
- ARJ32 - Official compression/decompression software for Windows console
- UNARJ - Official software, decompression only
- 7-Zip
- Open-source ARJ
- Konvertor
Ed. note: Some newer versions of ARJ/ARJ32 have a long delay (2 minutes?) when you run them.
Sample files
- http://cd.textfiles.com/20mnn/HPTEXT/PHRACK/
- The Silver Collection CDs have many ARJ files
- http://cd.textfiles.com/goldmedal/
