DDI Wad
DDI Wad is an archive file format developed by Data Design Interactive for storing files in video games. The format was first used in their 1997 game Conquest Earth. DDI Wad files usually use the file extension .wad. The format is unrelated to Doom WAD or Wii WAD files.
File formats
There are currently five known WAD formats: Conquest Earth Wad, LEGO Rock Raiders Wad, PlayStation Padded Wad for LEGO Rock Raiders, PWP for Tonka Space Station, and Tonka Space Station-onward Wads. Currently only LRR Wad and PWP are understood, with some research into TSS Wad.
LEGO Rock Raiders PC WAD
Format for the PC WAD format used in the Windows version of LEGO Rock Raiders.[1]
LEGO Rock Raiders uses two WAD files by default. These files are located in the game's install directory along with its executable file. LegoRR0.wad stores the majority of the game's data, while LegoRR1.wad stores the Main Lego Config File and language-related files. Additional streamed files are also stored in the Data folder, while streamed FMV files are stored in a separate Data folder on the game's disc.
The game searches for up to ten WAD files while loading, LegoRR0.wad to LegoRR9.wad. The WAD files do not have to have sequential numbers. The contents of WAD files with higher numbers take precedence over those with lower numbers (so if a file with the same name and path is stored in LegoRR0 and LegoRR1, only the file in LegoRR1 will be loaded).
LEGO Rock Raiders WAD file names are determined by the name of the game's executable file. When loading, LEGO Rock Raiders looks for WAD files sharing a name with the game's executable, following the format of <exename>#.wad. As the game's executable is named LegoRR.exe by default, the game looks for WAD files named LegoRR#.wad (the same functionality is used with the Lego* {} and LegoRR {} sections in its configuration-format files).[2]
| Type | Value | Description |
|---|---|---|
| char[4] | "WWAD" | ASCII file signature. Always WWAD for PC WAD files. |
| uint32 | Count | Number of file entries in the WAD file. |
| cstring[] | Names | Relative file entry paths within the WAD file ("Relative directories" or "Reldirs"). Example: |
| cstring[] | BuildNames | Original file paths used when building the WAD file ("Absolute directories" or "Absdirs"). These have no effect on the actual WAD data. Example: |
| Entry[] | Entries | File entry storage metadata (Location, size, and storage format). See below table for more information. |
Each file entry is 16 bytes, containing four 32-bit integer values.
| Type | Value | Description |
|---|---|---|
| uint32 | Flags | Flag determining what storage format the WAD uses. 01 for Store (uncompressed), 02 for Rob Northern compression (RNC). The game does not check for the Store flag, rather it checks against the RNC flag.[1] RNC is not known to be used in LEGO Rock Raiders, but it may be used in some Conquest Earth WADs. For more information on RNC, see Sega Retro and ModdingWiki.
|
| uint32 | PackedSize | The packed size each file's data in bytes. If the WAD entry is uncompressed, this entry must be identical to UnpackedSize.[1] |
| uint32 | UnpackedSize | The original unpacked size of each file in bytes. |
| uint32 | Offset | The absolute offset in bytes from the start of the WAD to each file's data. |
References
- ↑ 1.0 1.1 1.2 Jordan, Robert [trigger_segfault] (9 July 2021). "Format: WAD file". LEGO Rock Raiders Assembly Analysis wiki. GitHub. Archived from the original on 15 July 2023.
- ↑ (9 July 2021). " I can clarify a bit more on some of the loose ends like the CD priority, and expand on some information..." (comment on forum topic "NO WADS! or 10 Wads"). Archived from the original on 20 February 2024.
