X/Y GARC Structure

Author: Magical

Header {
Magic      [4]byte // "CRAG"
HeaderSize uint32  // Size in bytes of this header, always 0x1C
BOM        uint16  // Always 0xFEFF
_          uint16  // Always 0x400
ChunkCount uint32  // Always 4 (wait)
DataOffset uint32  // Offset to start of data inside the FIMG
chunk, relative to start of the GARC
Size       uint32  // Total size in bytes of the GARC
LastSize   uint32  // same as last word in the FATB chunk
}

FATO {
Magic       [4]byte // "OTAF"
Size        uint32  // Size in bytes of this chunk
OffsetCount uint16  // Number of records in this chunk
_           uint16  // Padding, always 0xFFFF

// Offsets into the FATB, relative to the start of the data
Offsets  [OffsetCount]uint32
}

FATB {
Magic       [4]byte // "BTAF"
Size        uint32  // Size in bytes of this chunk
FileCount   uint32  // The total number of File records in this chunk

// For each FATO record (OffsetCount)
[]struct{
Vec  uint32 // Bit vector
// For each set bit in Vec
Files []struct{
    // Start of the file data, relative to DataOffset and aligned to a four-byte boundary
        Start uint32
        // End of the file data, relative to DataOffset and aligned to a four-byte boundary
        End   uint32
        // Size of the file. This can be smaller than End-Start if the size is not a multiple of four bytes.
        Size  uint32
        }
}
}

FIMB {
    Magic      [4]byte // "BMIF"
    HeaderSize uint32  // Always 0xC
    DataSize   uint32  // Size in bytes of the following data

    Data []byte // File data. DataOffset points here.
}