DAT (Ever17)
Seen/used in the follow game(s):
- Ever17
Structure
| Header | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Content | Description | ||||||||||||
| 4Bytes | Magic/ID | |||||||||||||
| 4Bytes | File Count | |||||||||||||
| 8Bytes | 0x00 Filler | |||||||||||||
| Index | ||||||||||||||
| Size | Content | Description | ||||||||||||
| 4Bytes | Offset | Starts from zero. | ||||||||||||
| 4Bytes | File Size | Stored value is actual size doubled | ||||||||||||
| 24Bytes | File name | |||||||||||||
Notes for 'wallpaper.dat'
The files inside this archive appear to have been processed before put inside the archive. Every *.JPG file has a 256 byte chunk of data from offset 4352 to 4608 (base 10) that differs from the same file that is saved from the in-game wallpaper menu (special features). This effectively breaks/corrupts the picture. To fix this , you have to subtract each byte in the obstructed area by a specific number, which is not static for each byte and is different for each picture. This array of difference numbers is calculate by first adding the filename's characters together (think base 16/hexadecimal), and truncate the number to just 8-bits/1 Byte. This is the first difference number of the 256 needed to be generated. The rest are generated using a series of calculations using the previously generated number.
'a' starts off as the value of the previous number.
| Order | Expression |
|---|---|
| 1 | d = a + (a*2) |
| 2 | d = d + (d*8) |
| 3 | a = a+(d*4)+1243 |
Yay for dissemblers and debuggers? :P
Current task-> Rewrite archive tool for packing and unpacking. Fix flaws in wallpaper fix tool. Also think about renamming wallpaper fix tool if other files extracted show same thing, such as scripts.