ARJ
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{{FormatInfo | {{FormatInfo | ||
− | |subcat= | + | |subcat=Archiving |
|extensions={{ext|arj}} | |extensions={{ext|arj}} | ||
+ | |pronom={{PRONOM|fmt/610}} | ||
+ | |wikidata={{wikidata|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 [[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 == | ||
+ | * [[JAR (ARJ Software)]] | ||
+ | * [[SARJ]] | ||
+ | * [[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]]. 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 || (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 == | ||
+ | * The ARJ/UNARJ distributions include detailed format information, in a file named TECHNOTE.TXT or similar. | ||
+ | ** [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) | ||
+ | * [http://www.fileformat.info/format/arj/corion.htm The ARJ Archive File Format], from fileformat.info and Corion.net | ||
+ | |||
+ | == Software == | ||
+ | * [http://www.arjsoftware.com/ Official homepage of ARJ software] | ||
+ | * ARJ - Official compression/decompression software for DOS | ||
+ | ** {{CdTextfiles|nightowl/carrs/015A/ARJ013A.ZIP|v0.13a}} (1990-09-29) | ||
+ | ** {{CdTextfiles|hof91/ARC/ARJ100.LZH|v1.00}} (1991-02-07) | ||
+ | ** {{CdTextfiles|pier/pier01/001a/arj230.exe|v2.30}} (1992-01-19) | ||
+ | ** {{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) | ||
+ | ** [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) | ||
+ | * ARJ32 - Official compression/decompression software for Windows console | ||
+ | ** [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 | ||
+ | ** {{CdTextfiles|simtel/simtel20/MSDOS/ARCHIVRS/UNARJ241.ZIP|v2.41}} (1993-04) - Source code + DOS binary | ||
+ | ** [https://www.sac.sk/download/pack/unarj265.exe v2.65] (2002-06) - Source code + DOS binary + Windows console binary | ||
+ | * [[7-Zip]] | ||
+ | * [http://arj.sourceforge.net/ Open-source ARJ] | ||
+ | * [[Konvertor]] | ||
+ | |||
+ | ''Ed. note: Some newer versions of ARJ/ARJ32 have a long delay (2 minutes?) when you run them.'' | ||
− | == | + | == Sample files == |
− | + | * {{CdTextfilesURL|20mnn/HPTEXT/PHRACK/}} | |
+ | * {{CdTextfiles|silvercollection/|The Silver Collection}} CDs have many ARJ files | ||
+ | * {{CdTextfilesURL|goldmedal/}} | ||
− | == | + | == Links == |
− | * | + | * [[Wikipedia:ARJ|Wikipedia article]] |
− | + | ||
− | + | ||
− | + |
Revision as of 14:10, 30 January 2021
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. 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 | (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/