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      1 # Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
      2 #
      3 # Permission to use, copy, modify, and distribute this software and its
      4 # documentation for any purpose with or without fee is hereby granted,
      5 # provided that the above copyright notice and this permission notice
      6 # appear in all copies.
      7 #
      8 # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
      9 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
     11 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     14 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15 
     16 import dns.exception
     17 import dns.rdata
     18 import dns.tokenizer
     19 
     20 class NSAP(dns.rdata.Rdata):
     21     """NSAP record.
     22 
     23     @ivar address: a NASP
     24     @type address: string
     25     @see: RFC 1706"""
     26 
     27     __slots__ = ['address']
     28 
     29     def __init__(self, rdclass, rdtype, address):
     30         super(NSAP, self).__init__(rdclass, rdtype)
     31         self.address = address
     32 
     33     def to_text(self, origin=None, relativize=True, **kw):
     34         return "0x%s" % self.address.encode('hex_codec')
     35 
     36     def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
     37         address = tok.get_string()
     38         t = tok.get_eol()
     39         if address[0:2] != '0x':
     40             raise dns.exception.SyntaxError('string does not start with 0x')
     41         address = address[2:].replace('.', '')
     42         if len(address) % 2 != 0:
     43             raise dns.exception.SyntaxError('hexstring has odd length')
     44         address = address.decode('hex_codec')
     45         return cls(rdclass, rdtype, address)
     46 
     47     from_text = classmethod(from_text)
     48 
     49     def to_wire(self, file, compress = None, origin = None):
     50         file.write(self.address)
     51 
     52     def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
     53         address = wire[current : current + rdlen]
     54         return cls(rdclass, rdtype, address)
     55 
     56     from_wire = classmethod(from_wire)
     57 
     58     def _cmp(self, other):
     59         return cmp(self.address, other.address)
     60