HED - Revision history

Orin: /* Structure */

2026-03-05T20:55:36Z

Structure

← Older revision		Revision as of 20:55, 5 March 2026
Line 24:		Line 24:
	\| 4 bytes \|\| File ID \|\|		\| 4 bytes \|\| File ID \|\|
	\|-		\|-
	\| 4 bytes \|\| ~~File offset in data archive~~ \|\|		\| 4 bytes \|\| Offset (chunk size) \|\|
	\|}		\|}

	== See Also ==		== See Also ==
	[[CDF]]		[[CDF]]

Orin at 03:47, 23 January 2023

2023-01-23T03:47:25Z

← Older revision		Revision as of 03:47, 23 January 2023
Line 3:		Line 3:
	* [[Parasite Eve II]] (PSX)		* [[Parasite Eve II]] (PSX)

	The file ~~extension suggests~~ it ~~is some~~ type of ~~header file~~. ~~Possibly some sort of index that~~ is ~~used by the game to load game assets~~. ~~File name used~~ is ~~"STAGE0~~.~~HED"~~. ~~There~~ is no ~~difference between the one on disc 1 and 2 (they~~ are ~~1:1 match). A pattern is observed starting from position 128 (0x80). 4 bytes that increases followed~~ by ~~another 4~~ bytes ~~that appears to be a number with no obvious relation~~ to the first ~~number~~. ~~Essentially, there is pairs of 4 bytes for~~ the ~~majority~~ of the file. The ~~first 128~~ bytes ~~has no pattern~~ that ~~can be seen other than a possible ID~~ that ~~matches other formats where there~~ is ~~a header before each data entry that ID's~~ the type and ~~possibly~~ how ~~many frames/sectors the data occupies on the disc~~.		This file is only seen used with reference to "STAGE0.CDF". The other CDF files have the header file embedded inside at the start of CDF files. For this format, it appears the first 120 bytes are used for another type of reference. Online research shows this is streaming file list. The format is a little more complicated than I thought. Also have folder lists as well. However, at
			least for this one, as far as I can currently tell, there is no folders for STAGE0. All locations are aligned by 2048 bytes to match the CD structure frames/sectors. Initially I misread the
			zeros as padding but turns out they are the first file entry in the index. File 0 which starts at the offset of the file 0. So looks like 8 bytes of zeros but actually 2, 4 byte values.

			The index entry points to a data header section that is 16 bytes that describes the content that is stored at the location. This includes the file type and how large it is along with a few other
			values to figure out.

	== Structure ==		== Structure ==
Line 11:		Line 16:
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~128~~ bytes \|\| ~~Unknown~~ \|\|		\| 120 bytes \|\| Streaming list(?) \|\|
	\|-		\|-
	!colspan="15"\|Index		!colspan="15"\|Index
Line 17:		Line 22:
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| 4 bytes \|\| ~~Unknown~~ \|\|		\| 4 bytes \|\| File ID \|\|
	\|-		\|-
	\| 4 bytes \|\| ~~Unknown~~ \|\|		\| 4 bytes \|\| File offset in data archive \|\|
	\|}		\|}

	== See Also ==		== See Also ==
	[[CDF]]		[[CDF]]

Orin at 03:13, 30 July 2018

2018-07-30T03:13:19Z

← Older revision		Revision as of 03:13, 30 July 2018
Line 1:		Line 1:
	[[Category:Archives]]		[[Category:Archives]]
	Used in the following games:		Used in the following games:
	* Parasite Eve 2 (PSX)		* [[Parasite Eve II]] (PSX)

	The file extension suggests it is some type of header file. Possibly some sort of index that is used by the game to load game assets. File name used is "STAGE0.HED". There is no difference between the one on disc 1 and 2 (they are 1:1 match). A pattern is observed starting from position 128 (0x80). 4 bytes that increases followed by another 4 bytes that appears to be a number with no obvious relation to the first number. Essentially, there is pairs of 4 bytes for the majority of the file. The first 128 bytes has no pattern that can be seen other than a possible ID that matches other formats where there is a header before each data entry that ID's the type and possibly how many frames/sectors the data occupies on the disc.		The file extension suggests it is some type of header file. Possibly some sort of index that is used by the game to load game assets. File name used is "STAGE0.HED". There is no difference between the one on disc 1 and 2 (they are 1:1 match). A pattern is observed starting from position 128 (0x80). 4 bytes that increases followed by another 4 bytes that appears to be a number with no obvious relation to the first number. Essentially, there is pairs of 4 bytes for the majority of the file. The first 128 bytes has no pattern that can be seen other than a possible ID that matches other formats where there is a header before each data entry that ID's the type and possibly how many frames/sectors the data occupies on the disc.

Orin: /* Structure */

2018-07-30T03:10:49Z

Structure

← Older revision		Revision as of 03:10, 30 July 2018
Line 11:		Line 11:
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~3 \|\| Unknown \|\|~~		\| 128 bytes \|\| Unknown \|\|
	\|-
	~~\| 2 \|\| Header Size? \|\|~~
	\|-
	~~\| ?~~ \|\| Unknown \|\|
	\|-		\|-
	!colspan="15"\|Index		!colspan="15"\|Index
Line 21:		Line 17:
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~?Bytes~~ \|\| Unknown \|\|		\| 4 bytes \|\| Unknown \|\|
			\|-
			\| 4 bytes \|\| Unknown \|\|
	\|}		\|}

	== See Also ==		== See Also ==
	[[CDF]]		[[CDF]]

Orin at 03:10, 30 July 2018

2018-07-30T03:10:08Z

← Older revision		Revision as of 03:10, 30 July 2018
Line 3:		Line 3:
	* Parasite Eve 2 (PSX)		* Parasite Eve 2 (PSX)

	~~Possibly a~~ header file that is ~~connected~~ to the ~~CDF format~~. ~~Found the size of the header itself a few~~ bytes ~~in which can't~~ be a ~~coincidence~~. ~~However~~, ~~it does throw out an idea I had which was to list the value~~ of ~~each~~ 4-bytes ~~in an attempt to find a pattern. Specifically,~~ file ~~positions or LBA/sector locations~~. ~~I have~~ no ~~idea if~~ the ~~positions, when I find them, are~~ the ~~actually physical location or a virtual location~~.		The file extension suggests it is some type of header file. Possibly some sort of index that is used by the game to load game assets. File name used is "STAGE0.HED". There is no difference between the one on disc 1 and 2 (they are 1:1 match). A pattern is observed starting from position 128 (0x80). 4 bytes that increases followed by another 4 bytes that appears to be a number with no obvious relation to the first number. Essentially, there is pairs of 4 bytes for the majority of the file. The first 128 bytes has no pattern that can be seen other than a possible ID that matches other formats where there is a header before each data entry that ID's the type and possibly how many frames/sectors the data occupies on the disc.

	== Structure ==		== Structure ==

Orin at 19:44, 4 March 2018

2018-03-04T19:44:47Z

← Older revision		Revision as of 19:44, 4 March 2018
Line 3:		Line 3:
	* Parasite Eve 2 (PSX)		* Parasite Eve 2 (PSX)

	Possibly a header file that is connected to the CDF format.		Possibly a header file that is connected to the CDF format. Found the size of the header itself a few bytes in which can't be a coincidence. However, it does throw out an idea I had which was to list the value of each 4-bytes in an attempt to find a pattern. Specifically, file positions or LBA/sector locations. I have no idea if the positions, when I find them, are the actually physical location or a virtual location.

	== Structure ==		== Structure ==
Line 11:		Line 11:
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~128~~ \|\| Unknown \|\|		\| 3 \|\| Unknown \|\|
			\|-
			\| 2 \|\| Header Size? \|\|
			\|-
			\| ? \|\| Unknown \|\|
	\|-		\|-
	!colspan="15"\|Index		!colspan="15"\|Index
Line 17:		Line 21:
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~4Bytes \|\| File Number~~? \|\|		\| ?Bytes \|\| Unknown \|\|
	\|-
	~~\| 4Bytes \|\| File Position?~~ \|\|
	\|}		\|}

	== See Also ==		== See Also ==
	[[CDF]]		[[CDF]]

Orin at 20:50, 25 September 2016

2016-09-25T20:50:16Z

← Older revision		Revision as of 20:50, 25 September 2016
Line 21:		Line 21:
	\| 4Bytes \|\| File Position? \|\|		\| 4Bytes \|\| File Position? \|\|
	\|}		\|}

			== See Also ==
			[[CDF]]

Orin at 21:14, 27 April 2016

2016-04-27T21:14:57Z

← Older revision		Revision as of 21:14, 27 April 2016
Line 1:		Line 1:
	[[Category:Archives]]		[[Category:Archives]]
			Used in the following games:
			* Parasite Eve 2 (PSX)

	Possibly a header file that is connected to the CDF format.		Possibly a header file that is connected to the CDF format.

Orin: /* Structure */

2016-04-27T16:34:34Z

Structure

← Older revision		Revision as of 16:34, 27 April 2016
Line 4:		Line 4:

	== Structure ==		== Structure ==
	{\| class="~~Research~~"		{\| class="wikitable"
	!colspan="15"\|Header		!colspan="15"\|Header
	\|-		\|-
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~128Bytes~~ \|\| Unknown \|\|		\| 128 \|\| Unknown \|\|
	\|-		\|-
	!colspan="15"\|Index ~~Entry~~		!colspan="15"\|Index
	\|-		\|-
	! Size !! Content !! Description		! Size !! Content !! Description
	\|-		\|-
	\| ~~4bytes~~ \|\| File Number? \|\|		\| 4Bytes \|\| File Number? \|\|
	\|-		\|-
	\| ~~4bytes~~ \|\| Position? \|\|		\| 4Bytes \|\| File Position? \|\|
	\|}		\|}

Orin: Created page with "Category:Archives Possibly a header file that is connected to the CDF format. == Structure == {| class="Research" !colspan="15"|Header |- ! Size !! Content !! Descriptio..."

2016-04-27T16:32:55Z

Created page with "Category:Archives Possibly a header file that is connected to the CDF format. == Structure == {| class="Research" !colspan="15"|Header |- ! Size !! Content !! Descriptio..."

New page

[[Category:Archives]]

Possibly a header file that is connected to the CDF format.

== Structure ==
{| class="Research"
!colspan="15"|Header
|-
! Size !! Content !! Description
|-
| 128Bytes || Unknown ||
|-
!colspan="15"|Index Entry
|-
! Size !! Content !! Description
|-
| 4bytes || File Number? ||
|-
| 4bytes || Position? ||
|}