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Filename : ISDN.py
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# 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.immutable
import dns.rdata
import dns.tokenizer


@dns.immutable.immutable
class ISDN(dns.rdata.Rdata):
    """ISDN record"""

    # see: RFC 1183

    __slots__ = ["address", "subaddress"]

    def __init__(self, rdclass, rdtype, address, subaddress):
        super().__init__(rdclass, rdtype)
        self.address = self._as_bytes(address, True, 255)
        self.subaddress = self._as_bytes(subaddress, True, 255)

    def to_text(self, origin=None, relativize=True, **kw):
        if self.subaddress:
            return '"{}" "{}"'.format(
                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, relativize_to=None
    ):
        address = tok.get_string()
        tokens = tok.get_remaining(max_tokens=1)
        if len(tokens) >= 1:
            subaddress = tokens[0].unescape().value
        else:
            subaddress = ""
        return cls(rdclass, rdtype, address, subaddress)

    def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        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_parser(cls, rdclass, rdtype, parser, origin=None):
        address = parser.get_counted_bytes()
        if parser.remaining() > 0:
            subaddress = parser.get_counted_bytes()
        else:
            subaddress = b""
        return cls(rdclass, rdtype, address, subaddress)