An EARC archive contains multiple resources (files). It also contains information about each resource’s name and size.

WORD = Int16
DWORD = Int32

EARC File Structure

The beginning of each EARC file contains the header structure below. The table below holds data like the file counts, offsets to files and their names, also to the beginning of the raw file data stored inside.

Value	Type	Description
FileType	4 Char	File Type === CRAF
FileVersion	WORD	File Version info? (Not sure)
Unknown	WORD	Always seems to be 512. The minimum a files data seems to be padded with 0's until it is 512 bytes long. This could be a marker for readers to know how to handle the empty data???
FileCount	DWORD	The amount of files stored inside of this archive
Unknown 2	DWORD
OffsetToFileHeadersList	DWORD	Offset to the list of file headers
OffsetToNameList	DWORD	Offset to the list of File Names. They are stored as NULL terminated strings
OffsetToNameList2	DWORD	Offset to a second list of File Names. They are stored as NULL terminated strings
OffsetToRawData	DWORD	Offset to the Raw Data section of the archive
Unknown 3	DWORD
Unknown 4	DWORD
Padding?	24Bytes	Seems to always be 16 bytes of zeros. Might be padding for future expansion of the format.

EARC - File Headers Block

The file headers block consists of blocks of data described below. They hold references to a files size, offset, name offset and more. They are packed end to end after the file header.

Value	Type	Description
Unknown 1	DWORD
Unknown 2	DWORD
SizeCompressed	DWORD	The file size if compressed
Size	DWORD	The original file size
Flags	DWORD	Possibly a flag marking compression if the value is not 0 or 1 then the file data seems to be compressed with the zLib compression algorithm and SizeCompressed should be used as the compressed data size.
NameOffset1	DWORD	Offset in the file to a NULL terminated string
DataOffset	DWORD	Offset in the file to the raw data of the file
Unknown 3	DWORD
NameOffset2	DWORD	Offset in the file to a NULL terminated string
Unknown4	DWORD