Package dns :: Package rdtypes :: Module txtbase
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Source Code for Module dns.rdtypes.txtbase

 1  # Copyright (C) 2006, 2007, 2009-2011 Nominum, Inc. 
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15   
16  """TXT-like base class.""" 
17   
18  import dns.exception 
19  import dns.rdata 
20  import dns.tokenizer 
21   
22 -class TXTBase(dns.rdata.Rdata):
23 """Base class for rdata that is like a TXT record 24 25 @ivar strings: the text strings 26 @type strings: list of string 27 @see: RFC 1035""" 28 29 __slots__ = ['strings'] 30
31 - def __init__(self, rdclass, rdtype, strings):
32 super(TXTBase, self).__init__(rdclass, rdtype) 33 if isinstance(strings, str): 34 strings = [ strings ] 35 self.strings = strings[:]
36
37 - def to_text(self, origin=None, relativize=True, **kw):
38 txt = '' 39 prefix = '' 40 for s in self.strings: 41 txt += '%s"%s"' % (prefix, dns.rdata._escapify(s)) 42 prefix = ' ' 43 return txt
44
45 - def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
46 strings = [] 47 while 1: 48 token = tok.get().unescape() 49 if token.is_eol_or_eof(): 50 break 51 if not (token.is_quoted_string() or token.is_identifier()): 52 raise dns.exception.SyntaxError("expected a string") 53 if len(token.value) > 255: 54 raise dns.exception.SyntaxError("string too long") 55 strings.append(token.value) 56 if len(strings) == 0: 57 raise dns.exception.UnexpectedEnd 58 return cls(rdclass, rdtype, strings)
59 60 from_text = classmethod(from_text) 61
62 - def to_wire(self, file, compress = None, origin = None):
63 for s in self.strings: 64 l = len(s) 65 assert l < 256 66 byte = chr(l) 67 file.write(byte) 68 file.write(s)
69
70 - def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
71 strings = [] 72 while rdlen > 0: 73 l = ord(wire[current]) 74 current += 1 75 rdlen -= 1 76 if l > rdlen: 77 raise dns.exception.FormError 78 s = wire[current : current + l].unwrap() 79 current += l 80 rdlen -= l 81 strings.append(s) 82 return cls(rdclass, rdtype, strings)
83 84 from_wire = classmethod(from_wire) 85
86 - def _cmp(self, other):
87 return cmp(self.strings, other.strings)
88