const FileHeader = parser.structure.create({
    "ei_magic": { "offset": 0x00, "size": 4, "endianness": "big" },
    "ei_class": { "offset": 0x04, "size": 1 },
    "ei_data": { "offset": 0x05, "size": 1 },
    "ei_version": { "offset": 0x06, "size": 1 },