ARC (Yuno)
Used in the following game(s):
- Yuno
Index appears to be protected. First 4 bytes are number of entries in index/number of files in archive. Even with this, a quick look and guess work shows an index entry is 28-bytes in size. Filename space is 20-bytes, followed by (probably) two 4-byte numbers. Appears everything but the initial 4-bytes that stores the file count is protected. As for the protection... Appears each byte is XOR by 0x03 for at least the file names.
0303030303030303030303
=
0000000000000000000000
thus
5A564D4C5C32322D544255 (ZVML\22-TBU)
=
59554E4F5F31312E574156 (YUNO_11.WAV)
...really? ^^; Didn't even need a debugger for that. XD
And now for the data after that...
(Future me: ...did I really type that?)
| Header | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Content | Description | ||||||||||||
| 4 Bytes | File count | |||||||||||||
| Index Entry | ||||||||||||||
| Size | Content | Description | ||||||||||||
| 20 Bytes | File Name | XOR by 0x03 | ||||||||||||
| 4 Bytes | File Size | XOR by 0x33656755 | ||||||||||||
| 4 Bytes | File Position | XOR by 0x68820811 | ||||||||||||
It is unknown if some or none of the file data itself is protected. This may completely depend on what the data is. For example, the game script may have additional steps. The audio, specifically the music archive, appears to store the data without any obfuscation.