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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
implementation in [LuckSystem](https://github.com/wetor/LuckSystem).
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]--- |