Home For Developers ERF Format 3. ERF Key List

3. ERF Key List

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The ERF Key List specifies the filename and filetype of all the files packed into the ERF.

Key List Format

The Key List consists of a series of Key structures one after another. Unlike the String List elements, the Key List elements all have the same size. The EntryCount in the ERF header specifies the number of Keys.

Key List Element 0

Key List Element 1

Key List Element 2

....

Key List Element (n-1)

Key Structure

Each Key List Element has the following structure:

ResRef	16 bytes	Filename
ResID	32 bit	Resource ID, starts at 0 and increments
ResType	16 bit	File type
Unused	16 bit	NULLs

The ResRef is the name of the file with no null terminator and in lower case. A ResRef can only contain alphanumeric characters or underscores. It must have 1 to 16 characters, and if it contains less than 16 characters, the remaining ones are nulls.

The ResID in the key structure is redundant, because the its possible to get the ResID for any ERF Key by subtracting the OffsetToKeyList from its starting address and dividing by the size of a Key List structure.

When a file is extracted from an ERF, the ResRef is the name of the file after it is extracted, and the ResType specifies its file extension. For a list of ResTypes, see the section on ResTypes later in this document.

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