Age of Empires 1 and 2 DRS archive format/specification

DRS-Spec.md

Age of Empires DRS Archives

Files in a DRS archive do not have "names" in the typical sense.

They have an ID and an extension.

##DRS Format

###Header

The DRS header contains a copyright string, a version string,
an archive type string, the number of embedded files,
and the offset of the first embedded file from the start of the DRS archive.

Total: 64 bytes

Length	C# Type	Description
40 bytes	string	Copyright Info
4 bytes	string	File Version
12 bytes	string	Archive Type
4 bytes	int	Table Count
4 bytes	int	1st File Offset

####Output for interfac.drs: Copyright (c) 1997 Ensemble Studios.
1.00
tribe
4
2212
Note that after the tribe string there should be 7 "C String-Terminators" (\0).

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###Table Headers Files are sorted by their file extension into 'tables'.
This makes extracting specific file types easier since each table only contains a single file type.

####Table headers are laid out like so: Total: 12 bytes

Length	C# Type	Description
1 bytes	byte	Related to file type
3 bytes	string	Extension (reversed)
4 bytes	int	Table Offset
4 bytes	int	File Count

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###Tables At the start of each table is n groups of data related to the files in this table (where n is File Count).

####File Info Total: 12 bytes

Length	C# Type	Description
4 bytes	int	File ID
4 bytes	int	File Offset
4 bytes	int	Table Size

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