Settlers VI - Rise Of An Empire BBA

Back to index | Edit this page

FILE EXTENSION

• Format type: Archive
• Endianness: Little-endian

Format Specifications

char {3}      - Archive Header (BAF)

byte {1}      - Version (4)
uint32 {4}    - Unknown (5)
uint32 {4}    - Header Size (64)
uint32 {4}    - Header Encryption Identifier (0x29D58DC5)

// Header (encrpyted)

uint32 {4}    - Directory Offset Low

uint32 {4}    - Directory Offset High (null)

uint32 {4}    - Directory Length

uint32 {4}    - Directory CRC32 Checksum

uint32 {4}    - Directory Encryption Identifier

byte {44}     - null

// For each file

if (File Type Identifier == 1) {

// The first 16 Bytes are encrypted)

uint32 {4}    - Compressed Size

uint32 {4}    - Decompressed Size

byte {x}      - Compressed Filedata

} else {

byte {x}      - Uncompressed Filedata

}

// Directory (encrypted, compressed)

uint32 {4}    - Directory Header Size (64)

uint32 {4}    - Offset File Entries

uint32 {4}    - Offset File Hashtable

byte {52}     - null

char {3}      - Archive Header (BAF)

byte {1}      - Version (4)

uint32 {4}    - Unknown (5)

uint32 {4}    - Header Size (64)

uint32 {4}    - Header Encryption Identifier (0x29D58DC5)

uint32 {16}   - null

uint32 {4}    - Directory Encryption Identifier

byte {44}     - null

uint32 {32}   - Encryption Table

uint32 {32}   - null

uint32 {32}   - null

uint32 {32}   - null

uint32 {4}    - Number of Files

// For each file

uint32 {8}    - Timestamp

uint32 {4}    - Decompressed Filesize

uint32 {4}    - CRC32 Checksum

uint32 {4}    - Filetype Identifier

uint32 {4}    - null

uint32 {4}    - Offset

uint32 {4}    - null

uint32 {4}    - Compressed Filesize

uint32 {4}    - CRC32 Checksum

uint32 {8}    - null

uint32 {4}    - Filename Length

uint32 {4}    - Filename Offset

int32 {4}     - First Offset

int32 {4}     - Next Offset

char {x}      - Filename

byte {0-3}    - Padding

uint32 {4}    - Hashtable Size

// For each hashtable element

uint32 {4}    - Hash of a Filename

uint32 {4}    - File Entry Offset

Notes and Comments

• Some files and the directory are compressed using zlib
• Filetype Identifiers:
  • 0 - Uncompressed file
  • 1 - Compressed file
  • 256 - Directory
• Initial value for the CRC32 Checksums is 0
• The encryption algorithm is a modified TEA version (it has the same characteristic bitshifts)
  • There exists multiple versions of the same algorithm but with different 128-bit keys and different deltas
  • The Encryption Identifier will tell you which algorithm to use
• The hashfunction for the filenames is crc32()
• The Timestamp is the Windows FILETIME struct

Encryption Table

The data of some files may be compressed or encrypted. The Encryption Table maps the Filetype Identifier to an algorithm that can handle the data. The table has 8 available slots. The Filetype Identifier 0 is mapped to slot 0, Filetype Identifier 1 is mapped to slot 1 and so on...

If a slot is null, the data is neither compressed nor encrypted. Otherwise the slot contains an Encryption Identifier that tells you how to handle the data.

Example: We have a file with File Type Identifier 1. We look at slot 1 of the encryption table and will find the value: 0x9BB3F065. This tells us that we have a file that is compressed and that the first 16 Bytes of the filedata are encrypted with a simple XOR-algorithm.

MultiEx BMS Script

None written yet.

Supported by Programs

Unknown

Links

None

Games

None