import argparse

"""
  ISO 9660 filesystem utility.
"""

def read_vol_desc(f):
    s = f.read(2048)
    ty = s[0]
    Id = s[1:6]
    assert Id == 'CD001'.encode('ascii')
    ver = s[6]
    assert ver == 1
    data = s[7:]
    assert len(data) == 2041
    return ty, Id, s

def parse_boot_record(sec):
    boot_sys_id = sec[7:39]
    boot_id = sec[39:71]
    print(boot_sys_id)
    print(boot_id)

def parse_primary_volume(sec):
    sys_id = sec[8:40]
    vol_id = sec[40:72]
    print(sys_id)
    print(vol_id)

def read_iso(f):
    # System area
    system = f.read(16 * 2048)
    while True:
        ty, Id, dat = read_vol_desc(f)
        print(ty, Id)
        if ty == 255:
            break
        elif ty == 0:
            parse_boot_record(dat)
        elif ty == 1:
            parse_primary_volume(dat)


if __name__ == '__main__':
    with open('mikeos.iso', 'rb') as f:
        read_iso(f)