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Directory :  /proc/3/task/3/cwd/srv/modoboa/env/lib64/python3.5/site-packages/dns/

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Current File : /proc/3/task/3/cwd/srv/modoboa/env/lib64/python3.5/site-packages/dns/ipv4.py
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2003-2017 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.

"""IPv4 helper functions."""

import struct

import dns.exception
from ._compat import binary_type

def inet_ntoa(address):
    """Convert an IPv4 address in binary form to text form.

    *address*, a ``binary``, the IPv4 address in binary form.

    Returns a ``text``.
    """

    if len(address) != 4:
        raise dns.exception.SyntaxError
    if not isinstance(address, bytearray):
        address = bytearray(address)
    return ('%u.%u.%u.%u' % (address[0], address[1],
                             address[2], address[3]))

def inet_aton(text):
    """Convert an IPv4 address in text form to binary form.

    *text*, a ``text``, the IPv4 address in textual form.

    Returns a ``binary``.
    """

    if not isinstance(text, binary_type):
        text = text.encode()
    parts = text.split(b'.')
    if len(parts) != 4:
        raise dns.exception.SyntaxError
    for part in parts:
        if not part.isdigit():
            raise dns.exception.SyntaxError
        if len(part) > 1 and part[0] == '0':
            # No leading zeros
            raise dns.exception.SyntaxError
    try:
        bytes = [int(part) for part in parts]
        return struct.pack('BBBB', *bytes)
    except:
        raise dns.exception.SyntaxError

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