def METHOD_NAME():
    if len( sys.argv ) < 2:
        print("usage %s <xsvf_filename>" % sys.argv[0])
        exit(1)
    f = open( sys.argv[1], 'rb' )
    opcode = ReadByte( f )
    while opcode != -1:
        # print the position within the file, then the command
        print( "%d: " % f.tell(), end='' )
        ShowOpcode( opcode, f )
        opcode = ReadByte(f)