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✏️ Editing: ISDN.py

# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import struct

import dns.exception
import dns.rdata
import dns.tokenizer
from dns._compat import text_type

class ISDN(dns.rdata.Rdata):

"""ISDN record

@ivar address: the ISDN address
    @type address: string
    @ivar subaddress: the ISDN subaddress (or '' if not present)
    @type subaddress: string
    @see: RFC 1183"""

__slots__ = ['address', 'subaddress']

def __init__(self, rdclass, rdtype, address, subaddress):
        super(ISDN, self).__init__(rdclass, rdtype)
        if isinstance(address, text_type):
            self.address = address.encode()
        else:
            self.address = address
        if isinstance(address, text_type):
            self.subaddress = subaddress.encode()
        else:
            self.subaddress = subaddress

def to_text(self, origin=None, relativize=True, **kw):
        if self.subaddress:
            return '"%s" "%s"' % (dns.rdata._escapify(self.address),
                                  dns.rdata._escapify(self.subaddress))
        else:
            return '"%s"' % dns.rdata._escapify(self.address)

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        address = tok.get_string()
        t = tok.get()
        if not t.is_eol_or_eof():
            tok.unget(t)
            subaddress = tok.get_string()
        else:
            tok.unget(t)
            subaddress = ''
        tok.get_eol()
        return cls(rdclass, rdtype, address, subaddress)

def to_wire(self, file, compress=None, origin=None):
        l = len(self.address)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.address)
        l = len(self.subaddress)
        if l > 0:
            assert l < 256
            file.write(struct.pack('!B', l))
            file.write(self.subaddress)

@classmethod
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
        l = wire[current]
        current += 1
        rdlen -= 1
        if l > rdlen:
            raise dns.exception.FormError
        address = wire[current: current + l].unwrap()
        current += l
        rdlen -= l
        if rdlen > 0:
            l = wire[current]
            current += 1
            rdlen -= 1
            if l != rdlen:
                raise dns.exception.FormError
            subaddress = wire[current: current + l].unwrap()
        else:
            subaddress = ''
        return cls(rdclass, rdtype, address, subaddress)

MR SKB