CTPK

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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.

CTPK Header[edit]

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