PAKLEO - Revision history

Sembiance: /* Sample files */

2024-11-14T19:13:08Z

‎Sample files

Sembiance: sample files & software

2024-11-14T19:03:44Z

sample files & software

Jsummers: /* Format details */

2023-12-09T17:22:52Z

‎Format details

Jsummers: /* Format details */

2023-12-09T17:16:27Z

‎Format details

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|pll}} |wikidata={{wikidata|Q105854715}} |released=≤1993 }} '''PAKLEO''' is a compressed archive utili..."

2023-09-30T12:54:19Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|pll}} |wikidata={{wikidata|Q105854715}} |released=≤1993 }} '''PAKLEO''' is a compressed archive utili..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Archiving
|extensions={{ext|pll}}
|wikidata={{wikidata|Q105854715}}
|released=≤1993
}}
'''PAKLEO''' is a compressed archive utility for DOS, and associated '''.PLL''' format. It was developed by Leonardus Leonardi and ThunderSoft.

The compression utility is ''PAKLEO'', and the decompression utility is ''UNPAKLEO''. The ''format'' is possibly named ''LEOLZW'' (see also [[LZW]]).

== Discussion ==
Version 1.06 has a filename matching bug significant enough to mention. By way of example, if you try to archive a file named "ABC.XYZ", it will also archive files named "AB.XYZ" and "A.XYZ", if they exist.

== Format details ==
The format is an incompatible variant of [[LHA]], most similar to LHA's "header level 0".

Compression methods with identifiers "<code>-ll0-</code>" and "<code>-ll1-</code>" have been observed.

== Self-extracting archives ==
Included in the distribution is ''PLL2EXE'', a utility that converts a PLL file to a self-extracting archive in [[MS-DOS EXE|EXE]] form.

== Identification ==
Version 1.05/1.06 seems to require that a PLL file start with a 37-byte signature: ASCII "{{magic|LEOLZW - (c) Leonardus Leonardi 1993}}", followed by byte value {{magic|0x1a}}. ASCII "{{magic|-ll}}" should appear at offset 39.

A self-extracting PAKLEO archive apparently contains an embedded PLL file in the "overlay" segment (refer to [[MS-DOS EXE#Special file positions]]). For v1.05, that's probably always at offset 16381.

== Software ==
* [{{SACFTPURL|pack|pakll106.zip}} PAKLEO 1.06, UNPAKLEO 1.05, PLL2EXE 1.05]

← Older revision		Revision as of 19:13, 14 November 2024
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	== Sample files ==		== Sample files ==
	* {{DexvertSamples\|archive/pakleo}}		* {{DexvertSamples\|archive/pakleo}}
		+	* {{DexvertSamples\|archive/pakleoSelfExtracting}}

← Older revision		Revision as of 19:03, 14 November 2024
Line 34:		Line 34:
	== Software ==		== Software ==
	* [{{SACFTPURL\|pack\|pakll106.zip}} PAKLEO 1.06, UNPAKLEO 1.05, PLL2EXE 1.05]		* [{{SACFTPURL\|pack\|pakll106.zip}} PAKLEO 1.06, UNPAKLEO 1.05, PLL2EXE 1.05]
		+	* {{Deark}}
		+
		+	== Sample files ==
		+	* {{DexvertSamples\|archive/pakleo}}

@@ Line 20: / Line 20: @@
 === Compression methods ===
-Compression methods with identifiers "<code>-ll0-</code>" and "<code>-ll1-</code>" have been observed.
+Method "<code>-ll0-</code>" is uncompressed.
 == Self-extracting archives ==

← Older revision		Revision as of 17:16, 9 December 2023
Line 16:		Line 16:
	The format is an incompatible variant of [[LHA]], most similar to LHA's "header level 0".		The format is an incompatible variant of [[LHA]], most similar to LHA's "header level 0".

		+	=== CRC algorithm ===
		+	PAKLEO uses a different CRC algorithm than LHA. It seems to be a variant of the common [[CRC-32#CRC-32/ISO-HDLC\|CRC-32/ISO-HDLC]] algorithm. The differences are that the initial value is 0 (instead of 0xffffffff), and the bits are ''not'' inverted at the end.
		+
		+	=== Compression methods ===
	Compression methods with identifiers "<code>-ll0-</code>" and "<code>-ll1-</code>" have been observed.		Compression methods with identifiers "<code>-ll0-</code>" and "<code>-ll1-</code>" have been observed.