Editing WAD3

Derived from Quake's WAD2 format.
All data types uses little endian byte order.

After the format's header there are num_dirs directory entries that contains data about all the files within the WAD3 archive, as well as their position within the file. 

= File Structure =

== Header ==
{{binary_struct|SIGNATURE|type=string|length=4|description=Constant WAD3 signature.|value="WAD3"}}
{{binary_struct|TreeSize|type=uint32|length=4|description=The number of files within the WAD3 package.}}
{{binary_struct|HeaderSize|type=uint32|length=4|description=Offset of the file tree  relative to the beginning of the WAD3.}}

== File Tree ==
{{binary_struct|Offset|type=uint32|length=4|description=Offset of the entry data relative to the beginning of the WAD3 file.}}
{{binary_struct|DiskSize|type=uint32|length=4|description=The entry's disk size in the archive.}}
{{binary_struct|Length|type=uint32|length=4|description=The length of the entry's data.}}
{{binary_struct|Type|type=byte|length=1|description=The entry's file type.
* 0x42 [[QPic]] // Simple image of any size.
* 0x43 [[MipTex]] // World texture.  dimensions that are multiple-of-16 and 4 mipmaps. This is the typical entry type.
* 0x46 [[QFont]] // Fixed-height variable-width font for a single-byte character set (e.g. ASCII)
* 0x40 [[SprayDecal]] // Same as miptex. Only found in entry LOGO (or {LOGO) in tempdecal.wad}} 
{{binary_struct|Compressed|type=byte|length=1|description=Whether the file was compressed.}}
{{binary_struct|type=null|length=2|description=Padding.}}
{{binary_struct|FileName|type=string|length=32|description=File name, with up to 16 characters. The unused trailing characters are null. }}

== Files ==
File data is accessed by using Offset and Length.