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@ -8,38 +8,3 @@ The implementations for decompression of CZ1, CZ3, and CZ4 were derived from
for CZ2, and compression of CZ1, CZ3, and CZ4 was derived from the for CZ2, and compression of CZ1, CZ3, and CZ4 was derived from the
implementation in [LuckSystem](https://github.com/wetor/LuckSystem). implementation in [LuckSystem](https://github.com/wetor/LuckSystem).
This project would not have been possible without their amazing work. This project would not have been possible without their amazing work.
## Specifications and Info
Each `CZ#` file starts with a header. The first 14 (`0x0E`) bytes of the header
are common to all `CZ#` files. The data which come after that are specific
to each format, although several `CZ#` formats do share the same layout.
All byte layouts are in Little Endian.
### Common header:
| Offset | Ex. Values | ASCII | Purpose |
|-------------|-------------|-------|-----------------------------------|
| 0x00 - 0x03 | 43 5A 30 00 | CZ0 | Magic bytes |
| 0x04 - 0x07 | 24 00 00 00 | 36 | Header length in bytes |
| 0x08 - 0x09 | 58 01 | 344 | Width of the image in pixels |
| 0x0A - 0x0B | DC 02 | 732 | Height of the image in pixels |
| 0x0C - 0x0D | 20 00 | 32 | Bit depth of the image |
| 0x0E | 03 | 3 | Color block |
### The CZ0 and CZ3 header extra data:
| Offset | Ex. Values | ASCII | Purpose |
|-------------|-------------|-------|-----------------------------------|
| 0x0F - 0x13 | --- | --- | ---[Unknown]--- |
| 0x14 - 0x15 | 58 01 | 344 | Width of image crop |
| 0x16 - 0x17 | DC 02 | 732 | Height of image crop |
| 0x18 - 0x19 | 00 05 | 1280 | Width of image bounding box |
| 0x1A - 0x1B | 34 03 | 820 | Height of image bounding box |
| 0x1C - 0x1D | 80 02 | 640 | X offset of image, optional |
| 0x1E - 0x1F | 02 03 | 770 | Y offset of image, optional |
| 0x20 - 0x23 | --- | --- | ---[Unknown]---, optional |
### The CZ2 header extra data:
| Offset | Ex. Values | ASCII | Purpose |
|-------------|-------------|-------|-----------------------------------|
| 0x0F - 0x12 | --- | --- | ---[Unknown]--- |