#!/usr/bin/env python

import argparse

__doc__ = """
  ISO 9660 filesystem utility.
"""


class VolumeDescriptor:
    @classmethod
    def FromData(cls, d):
        ty = d[0]
        Id = d[1:6]
        assert Id == 'CD001'.encode('ascii')
        ver = d[6]
        assert ver == 1
        cls = vol_desc_types[ty]
        return cls(d)


vol_desc_types = {}
def vol_type(t):
    def reg_func(cls):
        vol_desc_types[t] = cls
        return cls
    return reg_func


@vol_type(0)
class BootRecordVolumeDescriptor(VolumeDescriptor):
    def __init__(self, d):
        boot_sys_id = d[7:39]
        boot_id = d[39:71]
        print(boot_sys_id)
        print(boot_id)


@vol_type(1)
class PrimaryVolumeDescriptor(VolumeDescriptor):
    def __init__(self, d):
        sys_id = d[8:40]
        vol_id = d[40:72]
        print(sys_id)
        print(vol_id)


@vol_type(255)
class VolumeDescriptorTerminator(VolumeDescriptor):
    def __init__(self, d):
        pass


class ISOfs:
    def __init__(self):
        self.vol_descriptors = []

    def read(self, f):
        # System area:
        self.system_area = f.read(16 * 2048)
        while True:
            d = f.read(2048)
            desc = VolumeDescriptor.FromData(d)
            self.vol_descriptors.append(desc)
            if type(desc) is VolumeDescriptorTerminator:
                break

    def dump(self):
        for vd in self.vol_descriptors:
            print(vd)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('filename')
    args = parser.parse_args()
    fs = ISOfs()
    with open(args.filename, 'rb') as f:
        fs.read(f)
    fs.dump()