PAQ - Revision history

AmigoJack: identification as per KGB Archiver 2 beta 2 source code

2023-10-17T22:30:52Z

identification as per KGB Archiver 2 beta 2 source code

Jsummers at 23:08, 13 February 2022

2022-02-13T23:08:51Z

Jsummers at 20:31, 12 November 2021

2021-11-12T20:31:29Z

Jsummers at 20:42, 10 February 2021

2021-02-10T20:42:57Z

Jsummers at 16:54, 16 May 2016

2016-05-16T16:54:15Z

Jsummers: Category:Compression research

2016-05-13T20:26:18Z

Category:Compression research

Dan Tobias at 04:17, 21 December 2012

2012-12-21T04:17:12Z

Dan Tobias at 13:55, 20 December 2012

2012-12-20T13:55:50Z

Dan Tobias at 13:54, 20 December 2012

2012-12-20T13:54:15Z

Dan Tobias: Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|pa6}}, {{ext|pa7}}, {{ext|pa8}}, {{ext|paq8p}}, others }} '''PAQ''' is actually a whole series of diff..."

2012-12-20T13:24:19Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|pa6}}, {{ext|pa7}}, {{ext|pa8}}, {{ext|paq8p}}, others }} '''PAQ''' is actually a whole series of diff..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Archiving
|extensions={{ext|pa6}}, {{ext|pa7}}, {{ext|pa8}}, {{ext|paq8p}}, others
}}

'''PAQ''' is actually a whole series of different compression programs and their associated file formats, designed to achieve maximum compression (for which the various versions have won some awards) at the possible expense of being slow and taking a lot of memory. Since compatibility (either forward or backward) among the different PAQ versions was not preserved, there are a wide assortment of incompatible formats associated with this group of programs, with new versions devised to implement improved compression techniques or techniques carefully tailored for particular sorts of data without regard for retaining the ability to compress or decompress the files created by earlier versions.

Since PAQ is open-source, there have been "forks" producing yet more adapted and incompatible versions.

== References ==
* [[Wikipedia:PAQ|Wikipedia article]]
* [http://mattmahoney.net/dc/ Official site]

← Older revision		Revision as of 22:30, 17 October 2023
Line 12:		Line 12:

	The author of PAQ (Matt Mahoney) also created [[BARF]] as a sort of ''reducio ad absurdum'' of file compression techniques.		The author of PAQ (Matt Mahoney) also created [[BARF]] as a sort of ''reducio ad absurdum'' of file compression techniques.
		+
		+	== Identification ==
		+	* PAQ1, PAQ2, PAQ3, PAQ4 and PAQ5 files start with ASCII {{magic\|PAQ}}, followed by ASCII {{magic\|1}} to {{magic\|5}} respectively, followed by a Windows line break (bytes {{magic\|0x0d 0x0a}} = CRLF = \r\n).
		+	* PAQ6 files start with ASCII {{magic\|PAQ6 -}}, followed most likely by ASCII {{magic\|0}} to {{magic\|9}} for the chosen memory consumption model, followed by a Windows line break (bytes {{magic\|0x0d 0x0a}} = CRLF = \r\n).
		+	* PAQ7 files start with ASCII {{magic\|paq7 -}}, followed most likely by ASCII {{magic\|1}} to {{magic\|5}} for the chosen memory consumption model, followed by a Windows line break (bytes {{magic\|0x0d 0x0a}} = CRLF = \r\n).

	== See also ==		== See also ==

@@ Line 5: / Line 5: @@
 |released=2002
 }}
-:''For other "PAQ" formats, see [[oPAQue]] and [[Quantum compressed archive]].''
+:''For other "PAQ" formats, see [[oPAQue]], [[PAQJ]], and [[Quantum compressed archive]].''
 '''PAQ''' is actually a whole series of different compression programs and their associated file formats, designed to achieve maximum compression (for which the various versions have won some awards) at the possible expense of being slow and taking a lot of memory. Since compatibility (either forward or backward) among the different PAQ versions was not preserved, there are a wide assortment of incompatible formats associated with this group of programs, with new versions devised to implement improved compression techniques or techniques carefully tailored for particular sorts of data without regard for retaining the ability to compress or decompress the files created by earlier versions.

@@ Line 5: / Line 5: @@
 |released=2002
 }}
-:''For another "PAQ" format, see [[oPAQue]].''
+:''For other "PAQ" formats, see [[oPAQue]] and [[Quantum compressed archive]].''
 '''PAQ''' is actually a whole series of different compression programs and their associated file formats, designed to achieve maximum compression (for which the various versions have won some awards) at the possible expense of being slow and taking a lot of memory. Since compatibility (either forward or backward) among the different PAQ versions was not preserved, there are a wide assortment of incompatible formats associated with this group of programs, with new versions devised to implement improved compression techniques or techniques carefully tailored for particular sorts of data without regard for retaining the ability to compress or decompress the files created by earlier versions.

@@ Line 5: / Line 5: @@
 |released=2002
 }}
 '''PAQ''' is actually a whole series of different compression programs and their associated file formats, designed to achieve maximum compression (for which the various versions have won some awards) at the possible expense of being slow and taking a lot of memory. Since compatibility (either forward or backward) among the different PAQ versions was not preserved, there are a wide assortment of incompatible formats associated with this group of programs, with new versions devised to implement improved compression techniques or techniques carefully tailored for particular sorts of data without regard for retaining the ability to compress or decompress the files created by earlier versions.

@@ Line 5: / Line 5: @@
 |released=2002
 }}
 '''PAQ''' is actually a whole series of different compression programs and their associated file formats, designed to achieve maximum compression (for which the various versions have won some awards) at the possible expense of being slow and taking a lot of memory. Since compatibility (either forward or backward) among the different PAQ versions was not preserved, there are a wide assortment of incompatible formats associated with this group of programs, with new versions devised to implement improved compression techniques or techniques carefully tailored for particular sorts of data without regard for retaining the ability to compress or decompress the files created by earlier versions.
@@ Line 11: / Line 10: @@
 The author of PAQ (Matt Mahoney) also created [[BARF]] as a sort of ''reducio ad absurdum'' of file compression techniques.
 == References ==

← Older revision		Revision as of 20:26, 13 May 2016
Line 15:		Line 15:
	* [[Wikipedia:PAQ\|Wikipedia article]]		* [[Wikipedia:PAQ\|Wikipedia article]]
	* [http://mattmahoney.net/dc/ Official site]		* [http://mattmahoney.net/dc/ Official site]
		+
		+	[[Category:Compression research]]

@@ Line 10: / Line 10: @@
 Since PAQ is open-source, there have been "forks" producing yet more adapted and incompatible versions.
-The author of PAQ also created [[BARF]] as a sort of ''reducio ad absurdum'' of file compression techniques.
+The author of PAQ (Matt Mahoney) also created [[BARF]] as a sort of ''reducio ad absurdum'' of file compression techniques.
 == References ==
 * [[Wikipedia:PAQ|Wikipedia article]]
 * [http://mattmahoney.net/dc/ Official site]

@@ Line 3: / Line 3: @@
 |subcat=Archiving
 |extensions={{ext|pa6}}, {{ext|pa7}}, {{ext|pa8}}, {{ext|paq8p}}, others
 }}