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16 import cStringIO
17 import struct
18
19 import dns.exception
20 import dns.rdata
21
23 """NSEC3PARAM record
24
25 @ivar algorithm: the hash algorithm number
26 @type algorithm: int
27 @ivar flags: the flags
28 @type flags: int
29 @ivar iterations: the number of iterations
30 @type iterations: int
31 @ivar salt: the salt
32 @type salt: string"""
33
34 __slots__ = ['algorithm', 'flags', 'iterations', 'salt']
35
36 - def __init__(self, rdclass, rdtype, algorithm, flags, iterations, salt):
42
43 - def to_text(self, origin=None, relativize=True, **kw):
44 if self.salt == '':
45 salt = '-'
46 else:
47 salt = self.salt.encode('hex-codec')
48 return '%u %u %u %s' % (self.algorithm, self.flags, self.iterations, salt)
49
50 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
51 algorithm = tok.get_uint8()
52 flags = tok.get_uint8()
53 iterations = tok.get_uint16()
54 salt = tok.get_string()
55 if salt == '-':
56 salt = ''
57 else:
58 salt = salt.decode('hex-codec')
59 return cls(rdclass, rdtype, algorithm, flags, iterations, salt)
60
61 from_text = classmethod(from_text)
62
63 - def to_wire(self, file, compress = None, origin = None):
68
69 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
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81 from_wire = classmethod(from_wire)
82
83 - def _cmp(self, other):
84 b1 = cStringIO.StringIO()
85 self.to_wire(b1)
86 b2 = cStringIO.StringIO()
87 other.to_wire(b2)
88 return cmp(b1.getvalue(), b2.getvalue())
89