U8 Archive - Revision history

Hyper at 19:07, 3 May 2026

2026-05-03T19:07:49Z

← Older revision		Revision as of 19:07, 3 May 2026
Line 69:		Line 69:
	\|UInt32[4]		\|UInt32[4]
	\|Reserved		\|Reserved
	\|These fields appear to be populated in archives for '''Sonic the Hedgehog (2006)''', but this is bogus data from uninitialised memory and should be ignored.		\|These fields appear to be populated in archives for '''Sonic the Hedgehog (2006)''', but this is bogus data from uninitialised memory and should be ignored.<br><br>For the sake of tooling heuristics, writing <code>0xE4F91300</code> (big-endian) to index 0 and <code>0x78013800</code> (big-endian) to index 3 would be ideal for detecting whether an archive is from that game specifically.
	For the sake of tooling heuristics, writing <code>0xE4F91300</code> (big-endian) to index 0 and <code>0x78013800</code> (big-endian) to index 3 would be ideal for detecting whether an archive is from that game specifically.
	\|}		\|}

Line 90:		Line 89:
	\|UInt24		\|UInt24
	\|NameOffset		\|NameOffset
	\|The offset of this node's name in the string pool.		\|The offset of this node's name in the string pool.<br>If root, always zero.
	If root, always zero.
	\|-		\|-
	\|0x04		\|0x04
Line 103:		Line 101:
	\|-		\|-
	\|Directory		\|Directory
	\|The index of the parent node for this directory.		\|The index of the parent node for this directory.<br>If root, always zero.
	If root, always zero.
	\|}		\|}
	\|-		\|-
Line 117:		Line 114:
	\|-		\|-
	\|Directory		\|Directory
	\|The total number of nodes in this directory.		\|The total number of nodes in this directory.<br>If root, the total number of nodes in this archive.
	If root, the total number of nodes in this archive.
	\|}		\|}
	\|-		\|-
Line 128:		Line 124:
	\|+		\|+
	\|File		\|File
	\|The uncompressed length of this file's data.		\|The uncompressed length of this file's data. This field can be set to zero to disable compression for this file, allowing its data to be stored uncompressed.
	This field can be set to zero to disable compression for this file, allowing its data to be stored uncompressed.
	\|-		\|-
	\|Directory		\|Directory
	\|Undefined.		\|Undefined. Much like the reserved bytes in the header, this field will appear to be populated, but again, this is bogus data from uninitialised memory.
	Much like the reserved bytes in the header, this field will appear to be populated, but again, this is bogus data from uninitialised memory.
	\|}		\|}
	\|}		\|}

Hyper at 19:58, 1 May 2026

2026-05-01T19:58:14Z

← Older revision		Revision as of 19:58, 1 May 2026
Line 5:		Line 5:
	\|+		\|+
	!Game		!Game
			!Usage
	!Platforms		!Platforms
	!~~Usage~~		!Year
	\|-		\|-
	\|Sonic Heroes		\|Sonic Heroes
			\| rowspan="2" \|Used as the packed file system.
	\|PlayStation 2		\|PlayStation 2
	\| ~~rowspan="2" \|Used as the packed file system.~~		\|2003
	\|-		\|-
	\|[[Sonic the Hedgehog (2006)]]		\|[[Sonic the Hedgehog (2006)]]
	\|Xbox 360, PlayStation 3		\|Xbox 360, PlayStation 3
			\|2006
	\|-		\|-
	\|Sonic and the Secret Rings		\|Sonic and the Secret Rings
			\| rowspan="2" \|Used for operating system only.
	\| rowspan="3" \|Wii		\| rowspan="3" \|Wii
	\| ~~rowspan="2" \|Used for operating system only.~~		\|2007
	\|-		\|-
	\|Sonic and the Black Knight		\|Sonic and the Black Knight
			\|2009
	\|-		\|-
	\|[[Sonic Colors]]		\|[[Sonic Colors]]
	\|Used as the packed file system.		\|Used as the packed file system.
			\|2010
	\|-		\|-
	\|Sonic Colors: Ultimate		\|Sonic Colors: Ultimate
			\|Used as the packed file system for data not covered by Godot.
	\|Windows, Xbox One, PlayStation 4, Switch		\|Windows, Xbox One, PlayStation 4, Switch
	\|~~Used as the packed file system for data not covered by Godot.~~		\|2021
	\|}		\|}

Hyper at 20:37, 2 December 2025

2025-12-02T20:37:48Z

← Older revision		Revision as of 20:37, 2 December 2025
Line 10:		Line 10:
	\|Sonic Heroes		\|Sonic Heroes
	\|PlayStation 2		\|PlayStation 2
	\|Used as the packed file system.		\| rowspan="2" \|Used as the packed file system.
	\|-		\|-
	\|[[Sonic the Hedgehog (2006)]]		\|[[Sonic the Hedgehog (2006)]]
	\|Xbox 360, PlayStation 3		\|Xbox 360, PlayStation 3
	~~\|Used as the packed file system.~~
	\|-		\|-
	\|Sonic and the Secret Rings		\|Sonic and the Secret Rings
	\|Wii		\| rowspan="3" \|Wii
	\|Used for operating system only.		\| rowspan="2" \|Used for operating system only.
	\|-		\|-
	\|Sonic and the Black Knight		\|Sonic and the Black Knight
	~~\|Wii~~
	~~\|Used for operating system only.~~
	\|-		\|-
	\|[[Sonic Colors]]		\|[[Sonic Colors]]
	~~\|Wii~~
	\|Used as the packed file system.		\|Used as the packed file system.
	\|-		\|-

Hyper at 20:36, 2 December 2025

2025-12-02T20:36:15Z

← Older revision		Revision as of 20:36, 2 December 2025
Line 2:		Line 2:

	== Titles using U8 Archive ==		== Titles using U8 Archive ==
			{\| class="wikitable"
	* '''Sonic Heroes~~''' (~~PlayStation 2) - ~~released 2004~~		\|+
	* '''[[Sonic the Hedgehog (2006)~~\|Sonic the Hedgehog~~]]~~''' (~~Xbox 360, PlayStation 3) - ~~released 2006~~		!Game
	* '''Sonic and the Secret Rings~~'''<sup>†</sup> (~~Wii) - ~~released 2007~~		!Platforms
	* '''Sonic and the Black Knight~~'''<sup>†</sup> (~~Wii) - ~~released 2009~~		!Usage
	* '''[[Sonic Colors]]~~''' (~~Wii) - ~~released 2010~~		\|-
	* '''Sonic Colors: Ultimate~~''' (~~Windows, Xbox One, PlayStation 4, Switch~~) - released 2021~~		\|Sonic Heroes
			\|PlayStation 2
	~~<sup>†</sup> — used~~ for ~~operating system only~~.		\|Used as the packed file system.
			\|-
			\|[[Sonic the Hedgehog (2006)]]
			\|Xbox 360, PlayStation 3
			\|Used as the packed file system.
			\|-
			\|Sonic and the Secret Rings
			\|Wii
			\|Used for operating system only.
			\|-
			\|Sonic and the Black Knight
			\|Wii
			\|Used for operating system only.
			\|-
			\|[[Sonic Colors]]
			\|Wii
			\|Used as the packed file system.
			\|-
			\|Sonic Colors: Ultimate
			\|Windows, Xbox One, PlayStation 4, Switch
			\|Used as the packed file system for data not covered by Godot.
			\|}

	== Specification ==		== Specification ==

Hyper at 13:39, 2 December 2025

2025-12-02T13:39:58Z

← Older revision		Revision as of 13:39, 2 December 2025
Line 4:		Line 4:

	* '''Sonic Heroes''' (PlayStation 2) - released 2004		* '''Sonic Heroes''' (PlayStation 2) - released 2004
	* '''Sonic the Hedgehog''' (Xbox 360, PlayStation 3) - released 2006		* '''[[Sonic the Hedgehog (2006)\|Sonic the Hedgehog]]''' (Xbox 360, PlayStation 3) - released 2006
	* '''Sonic and the Secret Rings'''<sup>†</sup> (Wii) - released 2007		* '''Sonic and the Secret Rings'''<sup>†</sup> (Wii) - released 2007
	* '''Sonic and the Black Knight'''<sup>†</sup> (Wii) - released 2009		* '''Sonic and the Black Knight'''<sup>†</sup> (Wii) - released 2009
	* '''Sonic ~~Colours~~''' (Wii) - released 2010		* '''[[Sonic Colors]]''' (Wii) - released 2010
	* '''Sonic ~~Colours~~: Ultimate''' (Windows, Xbox One, PlayStation 4, Switch) - released 2021		* '''Sonic Colors: Ultimate''' (Windows, Xbox One, PlayStation 4, Switch) - released 2021

	<sup>†</sup> — used for operating system only.		<sup>†</sup> — used for operating system only.

Hyper: Fix string pool expression

2025-12-02T13:12:38Z

Fix string pool expression

← Older revision		Revision as of 13:12, 2 December 2025
Line 118:		Line 118:
	=== String Pool ===		=== String Pool ===
	The string pool offset can be calculated after reading the root node and using the following expression:<syntaxhighlight lang="text">		The string pool offset can be calculated after reading the root node and using the following expression:<syntaxhighlight lang="text">
	FSTableOffset + (Root.NodeCount * 16)		FSTableOffset + (Root.NodeCount * FSNodeSize) // FSNodeSize = 0x0C (or 0x10 for Sonic the Hedgehog (2006))
	</syntaxhighlight>Each string in the pool is ASCII-encoded and null-terminated, the offsets to which are relative to the start of the pool.		</syntaxhighlight>Each string in the pool is ASCII-encoded and null-terminated, the offsets to which are relative to the start of the pool.

Hyper at 12:43, 2 December 2025

2025-12-02T12:43:22Z

← Older revision		Revision as of 12:43, 2 December 2025
Line 126:		Line 126:
	Files are aligned by 32 bytes per file after the string pool.		Files are aligned by 32 bytes per file after the string pool.

	In Sonic the Hedgehog (2006), files may be compressed using [[wikipedia:Zlib\|zlib]]. This compression is optional, and files can be stored uncompressed so long as <code>UncompressedLength</code> is set to zero.		In '''Sonic the Hedgehog (2006)''', files may be compressed using [[wikipedia:Zlib\|zlib]]. This compression is optional, and files can be stored uncompressed so long as <code>UncompressedLength</code> is set to zero.
	[[Category:File Formats]]		[[Category:File Formats]]

Hyper at 12:40, 2 December 2025

2025-12-02T12:40:37Z

← Older revision		Revision as of 12:40, 2 December 2025
Line 45:		Line 45:
	\|UInt32[4]		\|UInt32[4]
	\|Reserved		\|Reserved
	\|These fields appear to be populated in archives for [[Sonic the Hedgehog (2006)]], but this is bogus data from uninitialised memory and should be ignored.		\|These fields appear to be populated in archives for '''Sonic the Hedgehog (2006)''', but this is bogus data from uninitialised memory and should be ignored.
	For the sake of tooling heuristics, writing <code>0xE4F91300</code> (big-endian) to index 0 and <code>0x78013800</code> (big-endian) to index 3 would be ideal for detecting whether an archive is from that game specifically.		For the sake of tooling heuristics, writing <code>0xE4F91300</code> (big-endian) to index 0 and <code>0x78013800</code> (big-endian) to index 3 would be ideal for detecting whether an archive is from that game specifically.
	\|}		\|}

Hyper at 12:38, 2 December 2025

2025-12-02T12:38:16Z

Show changes

Hyper: Hyper moved page Arc File to U8 Archive over redirect

2025-12-02T12:09:56Z

Hyper moved page Arc File to U8 Archive over redirect

← Older revision	Revision as of 12:09, 2 December 2025
(No difference)