RAF is the RAW file format used by FujiFilm camera. It looks like a simple table with embedded JPEG some data and uncompressed CFA.

MIME type

image/x-fuji-raf

Organisation

28 bytes string to identify the file (magic)
- ```
FUJIFILMCCD-RAW 0201FF389501
```
20 bytes for the camera string, \0 terminated
100 bytes offset directory
- 36 bytes "unknown"
- Jpeg image offset (4 bytes)
- Jpeg Image length (4 bytes)
- Table1Offset (4 bytes)
- Table1Length (4 bytes)
- CFA Offset (4 bytes)
- CFA Length (4 bytes)
- rest unused
Jpeg image offset
- Exif JFIF with thumbnail + preview
Table 1 offset
- unknown
CFA Offset
- Uncompressed RAW

Apparently no compression is applied.