CTPK - CTR Texture PacKage
CTPK is a container file for one or multiple textures that are in various formats readable by the 3ds system.
Offsets are relative to the beginning of the header section unless specified.
| Offset
|
Length
|
Description
|
| 0x0
|
0x4
|
Magic "CTPK"
|
| 0x4
|
0x2
|
Version?
|
| 0x6
|
0x2
|
Number of Texture Entries
|
| 0x8
|
0x4
|
Texture Data section offset
|
| 0xC
|
0x4
|
Texture Data section size
|
| 0x10
|
0x4
|
Hash section offset
|
| 0x14
|
0x4
|
Conversion Info section offset
|
| 0x18
|
0x8
|
Padding
|
Texture Info Entry[edit]
The Header block is followed by a texture info entry for each texture in the container.
This block is usually followed by the bitmap size arrays and then the file paths.
0x20 byte aligned.
| Offset
|
Length
|
Description
|
| 0x0
|
0x4
|
File path Offset
|
| 0x4
|
0x4
|
Texture Data Size
|
| 0x8
|
0x4
|
Texture Data Offset (Relative to texture data block offset)
|
| 0xC
|
0x4
|
Texture Format
|
| 0x10
|
0x2
|
Width
|
| 0x12
|
0x2
|
Height
|
| 0x14
|
0x1
|
Mip Level
|
| 0x15
|
0x1
|
Type (0: Cube Map, 1: 1D, 2: 2D)
|
| 0x16
|
0x2
|
Cube Map Related
|
| 0x18
|
0x4
|
Bitmap Size Array Offset (Relative to to this block)
|
| 0x1C
|
0x4
|
Unix Timestamp
|
Hash Block Entry[edit]
The texture info block is followed by a hash entry for each texture entry.
0x8 byte aligned.
| Offset
|
Length
|
Description
|
| 0x0
|
0x4
|
Crc32 of the file path
|
| 0x4
|
0x4
|
Index
|
Conversion Info Block Entry[edit]
The hash block is followed by a conversion info entry for each texture entry.
0x4 byte aligned.
| Offset
|
Length
|
Description
|
| 0x0
|
0x1
|
Texture Format
|
| 0x1
|
0x1
|
Unknown
|
| 0x2
|
0x1
|
Compressed
|
| 0x3
|
0x1
|
ETC1 Related (Quality?)
|
Texture Data Block[edit]
This block and all it's texture entries are 0x80 byte aligned.
Texture Formats[edit]
| Value
|
Description
|
| 0x0
|
RGBA8888
|
| 0x1
|
RGB888
|
| 0x2
|
RGBA5551
|
| 0x3
|
RGB565
|
| 0x4
|
RGBA4444
|
| 0xC
|
ETC1
|
| 0xD
|
ETC1 + Alpha
|