Pattern type: 2-byte integer (decimal)
Offset to pixmap: 4-byte integer (decimal)
Offset to data: 4-byte integer (decimal)
Expanded pixel image: 4-byte zero fill
Pattern valid flag: 2-byte zero fill
Expanded pattern: 4-byte zero fill
Old-style pattern              : 8 data bytes
Base address: 4-byte zero fill
Row bytes: 2-byte integer (hex)
Bitmap bounds: rectangle
PixMap version: 2-byte integer (decimal)
Packing format: 2-byte integer (decimal)
Size of pixel data: 4-byte integer (decimal)
H. resolution: 4-byte integer (hex)
V. resoultion: 4-byte integer (hex)
Pixel type: 2-byte integer (decimal)
# bits in pixel: 2-byte integer (decimal)
# components in pixel: 2-byte integer (decimal)
# bits per field: 2-byte integer (decimal)
Offset to next plane: 4-byte integer (decimal)
Offset to color table            : 4-byte integer (decimal)
Reserved: 4-byte zero fill
Pixel data and color table: rest of data in resource