File archive

.wad file format is exactly the same as Worms .dir format, only extension is different.

Offset	Size	Description
0x0	0x4	Magic, 44 49 52 1A (DIR\x1A)
0x4	0x4	File size
0x8	0x4	Directory address
0xC	???	Files data

• file data spans up to the "address of directory". These two points are optional, but they provide a nice alignment:
  • There is 1A 00 at the end of each file
  • There may be 00 padding after that, so the next file/section starts at offset aligned to 4 bytes

Following offsets are counted from "Directory address"

Offset	Size	Description
0x0	0x4	Magic, 0A 00 00 00
0x4	0x1000	Hash table, 1024 4-byte entries
0x1004	???	File descriptors

Hash table

• each entry value + "address of directory" is a pointer to corresponding file descriptor
• each position is calculated, hash function is available at https://worms2d.info/Graphics_directory

each file descriptor have following structure:

Offset	Size	Description
0x0	0x4	Next hash, by default is set to 00 00 00 00
0x4	0x4	File data offset in archive
0x8	0x4	File size
0xC	0x4	Filename with path

File descriptors

• if two files have the same hash, then hash table points to first file, which have "next hash" to another file descriptor with the same hash. If there is no collision then it's 0.
• filename is 4 bytes aligned, terminated by 0x00 (and padded with 0x00 to 4 bytes)