ARJZ - Revision history

Jsummers: /* Software */

2023-09-01T14:15:32Z

‎Software

Jsummers at 13:11, 7 March 2023

2023-03-07T13:11:34Z

Jsummers: /* Software */

2023-03-07T13:09:07Z

‎Software

Jsummers at 14:56, 20 June 2022

2022-06-20T14:56:49Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|arj}} |released=~1995 }} '''ARJZ''' is a compressed archive utility, primarily developed by Булат ..."

2022-06-18T23:23:01Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|arj}} |released=~1995 }} '''ARJZ''' is a compressed archive utility, primarily developed by Булат ..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Archiving
|extensions={{ext|arj}}
|released=~1995
}}
'''ARJZ''' is a compressed archive utility, primarily developed by Булат Зиганшин (Bulat Ziganshin, according to translation software). Its native file format is an incompatible variant of [[ARJ]].

== Format details ==
ARJZ supports at least two new compression methods. Unfortunately, instead of inventing new compression method identifiers, it puts special values in the ''archiver version number'' field, and (at least when using the <code>-t9</code> option) the ''file type'' field.

ARJZ compression is similar enough to ARJ that in some cases, especially for small files, it may be decompressible by standard ARJ software. But in general, it is incompatible.

== Identification ==
Like [[ARJ#Identification|ARJ]], an ARJZ file starts with bytes {{magic|0x60 0xea}}, and has <code>0x02</code> at offset 10.

Unlike ARJ, an ARJZ file usually has <code>0x33</code> at offset 5 (meaning ''archiver version'' = 51). The documentation implies that this byte can also be <code>0x32</code>, but confirmation is needed.

== Software ==
* [{{SACFTPURL|pack|arjz015.zip}} ARJZ 0.15 alpha] - Includes binaries for DOS, OS/2, and Windows NT console.
* [{{SACFTPURL|pack|unaz015.zip}} UNARJZ 0.15 beta]

@@ Line 21: / Line 21: @@
 * [{{SACFTPURL|pack|arjz015.zip}} ARJZ 0.15 alpha] - Includes binaries for DOS, OS/2, and Windows NT console.
 * [{{SACFTPURL|pack|unaz015.zip}} UNARJZ 0.15 beta]
-* ARJZ 0.06 source code: [https://archive.org/details/2015-02-12.fidonet.org.ua FTP mirror - fidonet.org.ua - 2015-02-12] → fidonet.org.ua/pub/sources/arjz006s.rar (or {{DiscMasterLink|browse/20189/2015-02-12.fidonet.org.ua.tar/fidonet.org.ua/pub/sources/arjz006s.rar|at DiscMaster}})
+* ARJZ 0.06 source code: [https://archive.org/details/2015-02-12.fidonet.org.ua FTP mirror - fidonet.org.ua - 2015-02-12] → fidonet.org.ua/pub/sources/arjz006s.rar

← Older revision		Revision as of 13:09, 7 March 2023
Line 21:		Line 21:
	* [{{SACFTPURL\|pack\|arjz015.zip}} ARJZ 0.15 alpha] - Includes binaries for DOS, OS/2, and Windows NT console.		* [{{SACFTPURL\|pack\|arjz015.zip}} ARJZ 0.15 alpha] - Includes binaries for DOS, OS/2, and Windows NT console.
	* [{{SACFTPURL\|pack\|unaz015.zip}} UNARJZ 0.15 beta]		* [{{SACFTPURL\|pack\|unaz015.zip}} UNARJZ 0.15 beta]
		+	* ARJZ 0.06 source code: [https://archive.org/details/2015-02-12.fidonet.org.ua FTP mirror - fidonet.org.ua - 2015-02-12] → fidonet.org.ua/pub/sources/arjz006s.rar (or {{DiscMasterLink\|browse/20189/2015-02-12.fidonet.org.ua.tar/fidonet.org.ua/pub/sources/arjz006s.rar\|at DiscMaster}})

@@ Line 3: / Line 3: @@
 |subcat=Archiving
 |extensions={{ext|arj}}
-|released=~1995
+|released=~1994
 }}
-'''ARJZ''' is a compressed archive utility, primarily developed by Булат Зиганшин (Bulat Ziganshin, according to translation software). Its native file format is an incompatible variant of [[ARJ]].
+'''ARJZ''' is a compressed archive utility, primarily developed by Bulat Ziganshin (Булат Зиганшин). Its native file format is an incompatible variant of [[ARJ]].
 == Format details ==

@@ Line 8: / Line 8: @@
 == Format details ==
-ARJZ supports at least two new compression methods. Unfortunately, instead of inventing new compression method identifiers, it puts special values in the ''archiver version number'' field, and (at least when using the <code>-t9</code> option) the ''file type'' field.
+ARJZ's main features seem to be:
+* Increase ARJ's 26K history window to 32K, like [[LHA]]'s "lh6" method. Indicated by ARJ's ''minimum archiver version to extract'' field set to 50.
-ARJZ compression is similar enough to ARJ that in some cases, especially for small files, it may be decompressible by standard ARJ software. But in general, it is incompatible.
+* Increase the history window to 64K, like LHA's "lh7" method. Indicated by ARJ's ''minimum archiver version to extract'' field set to 51.
 == Identification ==
 Like [[ARJ#Identification|ARJ]], an ARJZ file starts with bytes {{magic|0x60 0xea}}, and has <code>0x02</code> at offset 10.
-Unlike ARJ, an ARJZ file usually has <code>0x33</code> at offset 5 (meaning ''archiver version'' = 51). The documentation implies that this byte can also be <code>0x32</code>, but confirmation is needed.
+Unlike ARJ, ARJZ files are observed to have <code>0x33</code> at offset 5 (meaning ''archiver version'' = 51).
 == Software ==
 * [{{SACFTPURL|pack|arjz015.zip}} ARJZ 0.15 alpha] - Includes binaries for DOS, OS/2, and Windows NT console.
 * [{{SACFTPURL|pack|unaz015.zip}} UNARJZ 0.15 beta]