FlatOut BFS

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Choose archive extension:

BFS

• Format Type : Archive
  
• Endian Order : Little Endian
  
• Signature : bfs1
  

Format Specifications

uint32 {4}   - Signature (bfs1)
uint32 {4}   - Version
uint32 {4}   - DataOffset
uint32 {4}   - Number Of Files

// for each file

uint32 {4}   - Compression Type (4=No Compression, 5=ZLib)

uint32 {4}   - File Offset

uint32 {4}   - Decompressed File Length

uint32 {4}   - Compressed File Length

uint32 {4}   - Checksum

uint16 {2}   - Filename Length

char {X}     - Filename

// for each file

uint16 {2}   - Unknown

uint16 {2}   - Unknown

Games

List of games using this file format:

• FlatOut (*.BFS)
• FlatOut 2 (*.BFS)
• FlatOut: Ultimate Carnage (*.BFS)

Notes and Comments

• To calculate the file checksums (checksum of the compressed data)...
  

Read as signed int, remove the sign and - 1 and you have the crc32.

ie. if checksum = -165278610 then crc32 = 165278609.

• The format uses ZLIB compression.
• The format seems to have some differences between FlatOut 1 and FlatOut 2.

QuickBMS script

• flatout_bfs1.bms (created for FlatOut 2)

Supported Programs

• bfs2pack (+ source code)
• BFS Workshop / mirror1
• Game Extractor
• Game Archive UnPacker (GAUP plugin)
• Magic Extractor / Magic Packer