PAKFormat

PAK File Format

These files contain textures, sprite, and scene information. All data is stored in big endian byte bordering unless otherwise noted.

The latest PAK file is loaded in RAM at address 0x272000.

Offset	Size	Notes
0x00000000	4 bytes	ID ascii string for file. Is either "unkn" or "OVER"
0x00000004	4 bytes	File Size
0x00000008	4 bytes	Offset to texture information structure
0x0000000C	4 bytes	Offset to sprite information structure
0x00000010	4 bytes	Offset to sprite group information structure
0x00000014	4 bytes	Offset to unknown structure
0x00000018	4 bytes	Offset to unknown structure
0x0000001C	4 bytes	Unknown data
0x00000020	2 bytes	Number of textures
0x00000022	2 bytes	Number of sprite groups
0x00000024	2 bytes	Unknown data. Number of entries for data pointed to by offset 0x14?
0x00000026	2 bytes	Number of entries for data pointed to by offset 0x18
0x00000028	2 bytes	Number of entries for data pointed to by offset 0x2C
0x0000002A	2 bytes	Number of entries for data pointed to by offset 0x30? + 2?
0x0000002C	4 bytes	Offset to unknown data. Structure of 4 bytes per entry
0x00000030	4 bytes	Offset to unknown data. Appears to be structure of 4? bytes per entry
0x00000030	4 bytes
0x00000034	12 bytes	Always 0xFFFFFFFF000000000001000F

8-byte records containing the texture dimensions, used to compute the offsets for the CHR files.

Relative Offset	Size	Notes
0x00000000	4 bytes	Address. Overwritten with the actual CHR offset when loaded in RAM. Due to DMA transfers this address is padded to a multiple of 0x20 = 32 bytes.
0x00000004	1 byte	Texture width (must be a multiple of 8)
0x00000005	1 byte	Texture height
0x00000006	2 bytes	Texture Index (can be used to swap textures in the same file)

12-byte records containing the relative texture rendering coords.

Relative Offset	Size	Notes
0x00000000	2 bytes	Index. Reference to a single Texture information struct in the previous section (0-indexed)
0x00000002	8 bytes	Relative coordinates. Serialized like this `XXYYXXYYXXYYXXYY`, from the top-left corner in clockwise order. Some values can be negative depending on the following flags.
0x0000000A	2 bytes	Origin-crossing flags?