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comparison python/utils/iso9660.py @ 290:7b38782ed496

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author Windel Bouwman
date Sun, 24 Nov 2013 11:24:15 +0100
parents python/iso9660.py@1c7c1e619be8
children
comparison
equal deleted inserted replaced
289:bd2593de3ff8 290:7b38782ed496
1 #!/usr/bin/env python
2
3 import argparse
4
5 __doc__ = """
6 ISO 9660 filesystem utility.
7 """
8
9
10 class VolumeDescriptor:
11 @classmethod
12 def FromData(cls, d):
13 ty = d[0]
14 Id = d[1:6]
15 assert Id == 'CD001'.encode('ascii')
16 ver = d[6]
17 assert ver == 1
18 cls = vol_desc_types[ty]
19 return cls(d)
20
21
22 vol_desc_types = {}
23 def vol_type(t):
24 def reg_func(cls):
25 vol_desc_types[t] = cls
26 return cls
27 return reg_func
28
29
30 @vol_type(0)
31 class BootRecordVolumeDescriptor(VolumeDescriptor):
32 def __init__(self, d):
33 boot_sys_id = d[7:39]
34 boot_id = d[39:71]
35 print(boot_sys_id)
36 print(boot_id)
37
38
39 @vol_type(1)
40 class PrimaryVolumeDescriptor(VolumeDescriptor):
41 def __init__(self, d):
42 sys_id = d[8:40]
43 vol_id = d[40:72]
44 print(sys_id)
45 print(vol_id)
46
47
48 @vol_type(255)
49 class VolumeDescriptorTerminator(VolumeDescriptor):
50 def __init__(self, d):
51 pass
52
53
54 class ISOfs:
55 def __init__(self):
56 self.vol_descriptors = []
57
58 def read(self, f):
59 # System area:
60 self.system_area = f.read(16 * 2048)
61 while True:
62 d = f.read(2048)
63 desc = VolumeDescriptor.FromData(d)
64 self.vol_descriptors.append(desc)
65 if type(desc) is VolumeDescriptorTerminator:
66 break
67
68 def dump(self):
69 for vd in self.vol_descriptors:
70 print(vd)
71
72
73 if __name__ == '__main__':
74 parser = argparse.ArgumentParser(description=__doc__)
75 parser.add_argument('filename')
76 args = parser.parse_args()
77 fs = ISOfs()
78 with open(args.filename, 'rb') as f:
79 fs.read(f)
80 fs.dump()
81
82