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' Extracting images straight from the container file will produce broken images. There is nothing wrong with the extraction process but rather the files themselves. Starting from offset 4352 and ending at 4608 in every single JPG, this 256 byte has been modified in some way.
There is a subroutine in the EXE that will take 1 byte from the JPG that is stored in memory, subtracted it by a number, then put it back. It does this 256 times, or the whole 256 byte chunk of data that is obstructed and only for locations between 4352 and 4608. The number that is subtracted from the raw value is not the same for each byte. Unsure how the subtraction numbers are generated but it does not appear to be stored in the EXE.