Tag - every DFF file begins with the four characters '%DF2' to identify it as a DFF file

Count - a Motorola-style long word (4 bytes); the number of items in the DFF file

Array of Item Headers - each header is 20 bytes; there are exactly Count many
    Symbol - the eight character type code, similar to a Macintosh resource type
    ID Number - a Motorola-style short word (2 bytes); the ID number
    Data Type - a Motorola-style short word (2 bytes); no longer used
    Flags - 2 bytes of binary flags
        0 (LSB of 2nd byte) - Locked
        1                   - System
        2                   - Preload
        3                   - Purgable
        4                   - Came From File
        5                   - Came From Mac Resource
        6                   - Hidden
        7 (MSB of 2nd byte) - Disabled
        8 (LSB of 1st byte) - Protected
        9                   - Reserved
        10                  - Reserved
        11                  - Reserved
        12                  - Use For Whatever You Want
        13                  - Use For Whatever You Want
        14                  - Use For Whatever You Want
        15(MSB of 1st byte) - Use For Whatever You Want
    Reserved - 2 unused bytes for future use
    Length - a Motorola-style long word (4 bytes); the length of the item's data

Array of Item Names - each name is a Pascal string; there are exactly Count many

Array of Item Data - each item's raw data, right after the previous with no separators; the headers can be used to calculate the position and length of the data needed