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✏️ Editing: HINFO.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 HINFO(dns.rdata.Rdata):

"""HINFO record

@ivar cpu: the CPU type
    @type cpu: string
    @ivar os: the OS type
    @type os: string
    @see: RFC 1035"""

__slots__ = ['cpu', 'os']

def __init__(self, rdclass, rdtype, cpu, os):
        super(HINFO, self).__init__(rdclass, rdtype)
        if isinstance(cpu, text_type):
            self.cpu = cpu.encode()
        else:
            self.cpu = cpu
        if isinstance(os, text_type):
            self.os = os.encode()
        else:
            self.os = os

def to_text(self, origin=None, relativize=True, **kw):
        return '"%s" "%s"' % (dns.rdata._escapify(self.cpu),
                              dns.rdata._escapify(self.os))

@classmethod
    def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
        cpu = tok.get_string()
        os = tok.get_string()
        tok.get_eol()
        return cls(rdclass, rdtype, cpu, os)

def to_wire(self, file, compress=None, origin=None):
        l = len(self.cpu)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.cpu)
        l = len(self.os)
        assert l < 256
        file.write(struct.pack('!B', l))
        file.write(self.os)

@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
        cpu = wire[current:current + l].unwrap()
        current += l
        rdlen -= l
        l = wire[current]
        current += 1
        rdlen -= 1
        if l != rdlen:
            raise dns.exception.FormError
        os = wire[current: current + l].unwrap()
        return cls(rdclass, rdtype, cpu, os)

MR SKB