BIF File Format

BIF File Format

BIFF v1

BIFF Header v1

Offset	Size	Type	Description
0	4	CHAR	Signature 'BIFF'
4	4	CHAR	Version 'V1 '
8	4	DWORD	Number of FileEntries
12	4	DWORD	Number of TileEntries
16	4	DWORD	Offset to FileEntries

BIFF FileEntries v1

Offset	Size	Type	Description
0	4	DWORD	ResourceLocator
4	4	DWORD	ResourceOffset
8	4	DWORD	ResourceSize
12	2	WORD	ResourceType
14	2	WORD	Unknown

Note: ResourceLocator - The IE resource manager uses 32-bit values as a 'resource index', which codifies the source of the resource as well as which source it refers to. The layout of this value is:

• bits 31-20: source index (the ordinal value giving the index of the corresponding BIF entry)
• bits 19-14: tileset index
• bits 13- 0: non-tileset file index ( 12 bit value, that matches the value used in the BIF file)

BIFF TileEntries v1

Offset	Size	Type	Description
0	4	DWORD	ResourceLocator
4	4	DWORD	ResourceOffset
8	4	DWORD	Tiles count
12	4	DWORD	Tile size
16	2	WORD	ResourceType
18	2	WORD	Unknown

BIF_ v1 (Compressed)

BIF_ Header v1

Offset	Size	Type	Description
0	4	CHAR	Signature 'BIF '
4	4	CHAR	Version 'V1 '
8	4	DWORD	Filename Length *1
12	*1	CHAR	Filename
16 + SIZEOF(Filename)	4	DWORD	Uncompressed Data Length
20+ SIZEOF(Filename)	4	DWORD	Compressed Data Length *2
24+ SIZEOF(Filename)	*2	BYTE	Compressed Data

BIFC v1.0 (Compressed Blocks)

BIFC Header v1.0

Offset	Size	Type	Description
0	4	CHAR	Signature 'BIFC'
4	4	CHAR	Version 'V1.0'
8	4	DWORD	Uncompressed BIFF size

BIFC Block v1.0

Offset	Size	Type	Description
0	4	DWORD	Uncompressed Block Size
4	4	DWORD	Compressed Block Size *1
8	*1	BYTE	Compressed Data

BIFF v1.1

BIFF Header v1.1

Offset	Size	Type	Description
0	4	CHAR	Signature 'BIFF'
4	4	CHAR	Version 'V1.1'
8	4	DWORD	Number of FileEntries
12	4	DWORD	NULL
16	4	DWORD	Offset to FileEntries

BIFF FileEntries v1.1

Offset	Size	Type	Description
0	4	DWORD	ResourceLocator
4	4	DWORD	ResourceFlags
8	4	DWORD	ResourceOffset
12	4	DWORD	ResourceSize
16	2	WORD	ResourceType
18	2	WORD	Unknown

Note: ResourceLocator - The IE resource manager uses 32-bit values as a 'resource index', which codifies the source of the resource as well as which source it refers to. The layout of this value is:

• bits 31-20: source index (the ordinal value giving the index of the corresponding BIF entry)
• bits 19-14: tileset index
• bits 13- 0: non-tileset file index ( 12 bit value, that matches the value used in the BIF file)

Note: ResourceFlags - BIF index is now stored in ResourceFlags, (flags & 0xFFF00000) >> 20). The rest appears to define 'fixed' index.

Note: There are no TileEntries in BIF v1.1 files