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?? e164.py(3.07 KB)
?? edns.py(4.28 KB)
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?? exception.py(4.52 KB)
?? flags.py(2.6 KB)
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?? ipv4.py(1.98 KB)
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?? namedict.py(3.59 KB)
?? node.py(5.91 KB)
?? opcode.py(2.48 KB)
?? query.py(19.18 KB)
?? rcode.py(3.03 KB)
?? rdata.py(14.65 KB)
?? rdataclass.py(3.18 KB)
?? rdataset.py(11.29 KB)
?? rdatatype.py(5.21 KB)
?? rdtypes
?? renderer.py(11.64 KB)
?? resolver.py(50.88 KB)
?? reversename.py(3.23 KB)
?? rrset.py(5.85 KB)
?? set.py(7.53 KB)
?? tokenizer.py(17.88 KB)
?? tsig.py(7.54 KB)
?? tsigkeyring.py(1.7 KB)
?? ttl.py(2.23 KB)
?? update.py(9.78 KB)
?? version.py(1.23 KB)
?? wiredata.py(3.64 KB)
?? zone.py(39.09 KB)

Editing: wiredata.py

# Copyright (C) 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.

"""DNS Wire Data Helper"""

import sys

import dns.exception
from ._compat import binary_type, string_types

# Figure out what constant python passes for an unspecified slice bound.
# It's supposed to be sys.maxint, yet on 64-bit windows sys.maxint is 2^31 - 1
# but Python uses 2^63 - 1 as the constant.  Rather than making pointless
# extra comparisons, duplicating code, or weakening WireData, we just figure
# out what constant Python will use.

class _SliceUnspecifiedBound(binary_type):

def __getitem__(self, key):
        return key.stop

if sys.version_info < (3,):
        def __getslice__(self, i, j):  # pylint: disable=getslice-method
            return self.__getitem__(slice(i, j))

_unspecified_bound = _SliceUnspecifiedBound()[1:]

class WireData(binary_type):
    # WireData is a string with stricter slicing

def __getitem__(self, key):
        try:
            if isinstance(key, slice):
                # make sure we are not going outside of valid ranges,
                # do stricter control of boundaries than python does
                # by default
                start = key.start
                stop = key.stop

if sys.version_info < (3,):
                    if stop == _unspecified_bound:
                        # handle the case where the right bound is unspecified
                        stop = len(self)

if start < 0 or stop < 0:
                        raise dns.exception.FormError
                    # If it's not an empty slice, access left and right bounds
                    # to make sure they're valid
                    if start != stop:
                        super(WireData, self).__getitem__(start)
                        super(WireData, self).__getitem__(stop - 1)
                else:
                    for index in (start, stop):
                        if index is None:
                            continue
                        elif abs(index) > len(self):
                            raise dns.exception.FormError

return WireData(super(WireData, self).__getitem__(
                    slice(start, stop)))
            return bytearray(self.unwrap())[key]
        except IndexError:
            raise dns.exception.FormError

if sys.version_info < (3,):
        def __getslice__(self, i, j):  # pylint: disable=getslice-method
            return self.__getitem__(slice(i, j))

def __iter__(self):
        i = 0
        while 1:
            try:
                yield self[i]
                i += 1
            except dns.exception.FormError:
                raise StopIteration

def unwrap(self):
        return binary_type(self)

def maybe_wrap(wire):
    if isinstance(wire, WireData):
        return wire
    elif isinstance(wire, binary_type):
        return WireData(wire)
    elif isinstance(wire, string_types):
        return WireData(wire.encode())
    raise ValueError("unhandled type %s" % type(wire))

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