Data lump

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WAD files consist of data lumps and a WAD directory. Each data lump is identified by a case-insensitive name whose length is at most 8 characters.

Marker lumps are special data lumps that have no data (their length is zero), but their location in the WAD directory is used as information. For instance, the location of the lumps that contain data for a map is marked by a marker lump.