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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 binascii

import dns.exception
import dns.rdata
import dns.tokenizer


class NSAP(dns.rdata.Rdata):

    """NSAP record."""

    # see: RFC 1706

    __slots__ = ['address']

    def __init__(self, rdclass, rdtype, address):
        super().__init__(rdclass, rdtype)
        object.__setattr__(self, 'address', address)

    def to_text(self, origin=None, relativize=True, **kw):
        return "0x%s" % binascii.hexlify(self.address).decode()

    @classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True,
                  relativize_to=None):
        address = tok.get_string()
        tok.get_eol()
        if address[0:2] != '0x':
            raise dns.exception.SyntaxError('string does not start with 0x')
        address = address[2:].replace('.', '')
        if len(address) % 2 != 0:
            raise dns.exception.SyntaxError('hexstring has odd length')
        address = binascii.unhexlify(address.encode())
        return cls(rdclass, rdtype, address)

    def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        file.write(self.address)

    @classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        address = parser.get_remaining()
        return cls(rdclass, rdtype, address)