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Directory : /usr/lib/python3.6/site-packages/asn1crypto/

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Current File : /usr/lib/python3.6/site-packages/asn1crypto//_inet.py

# coding: utf-8
from __future__ import unicode_literals, division, absolute_import, print_function

import socket
import struct

from ._errors import unwrap
from ._types import byte_cls, bytes_to_list, str_cls, type_name


def inet_ntop(address_family, packed_ip):
    """
    Windows compatibility shim for socket.inet_ntop().

    :param address_family:
        socket.AF_INET for IPv4 or socket.AF_INET6 for IPv6

    :param packed_ip:
        A byte string of the network form of an IP address

    :return:
        A unicode string of the IP address
    """

    if address_family not in set([socket.AF_INET, socket.AF_INET6]):
        raise ValueError(unwrap(
            '''
            address_family must be socket.AF_INET (%s) or socket.AF_INET6 (%s),
            not %s
            ''',
            repr(socket.AF_INET),
            repr(socket.AF_INET6),
            repr(address_family)
        ))

    if not isinstance(packed_ip, byte_cls):
        raise TypeError(unwrap(
            '''
            packed_ip must be a byte string, not %s
            ''',
            type_name(packed_ip)
        ))

    required_len = 4 if address_family == socket.AF_INET else 16
    if len(packed_ip) != required_len:
        raise ValueError(unwrap(
            '''
            packed_ip must be %d bytes long - is %d
            ''',
            required_len,
            len(packed_ip)
        ))

    if address_family == socket.AF_INET:
        return '%d.%d.%d.%d' % tuple(bytes_to_list(packed_ip))

    octets = struct.unpack(b'!HHHHHHHH', packed_ip)

    runs_of_zero = {}
    longest_run = 0
    zero_index = None
    for i, octet in enumerate(octets + (-1,)):
        if octet != 0:
            if zero_index is not None:
                length = i - zero_index
                if length not in runs_of_zero:
                    runs_of_zero[length] = zero_index
                longest_run = max(longest_run, length)
                zero_index = None
        elif zero_index is None:
            zero_index = i

    hexed = [hex(o)[2:] for o in octets]

    if longest_run < 2:
        return ':'.join(hexed)

    zero_start = runs_of_zero[longest_run]
    zero_end = zero_start + longest_run

    return ':'.join(hexed[:zero_start]) + '::' + ':'.join(hexed[zero_end:])


def inet_pton(address_family, ip_string):
    """
    Windows compatibility shim for socket.inet_ntop().

    :param address_family:
        socket.AF_INET for IPv4 or socket.AF_INET6 for IPv6

    :param ip_string:
        A unicode string of an IP address

    :return:
        A byte string of the network form of the IP address
    """

    if address_family not in set([socket.AF_INET, socket.AF_INET6]):
        raise ValueError(unwrap(
            '''
            address_family must be socket.AF_INET (%s) or socket.AF_INET6 (%s),
            not %s
            ''',
            repr(socket.AF_INET),
            repr(socket.AF_INET6),
            repr(address_family)
        ))

    if not isinstance(ip_string, str_cls):
        raise TypeError(unwrap(
            '''
            ip_string must be a unicode string, not %s
            ''',
            type_name(ip_string)
        ))

    if address_family == socket.AF_INET:
        octets = ip_string.split('.')
        error = len(octets) != 4
        if not error:
            ints = []
            for o in octets:
                o = int(o)
                if o > 255 or o < 0:
                    error = True
                    break
                ints.append(o)

        if error:
            raise ValueError(unwrap(
                '''
                ip_string must be a dotted string with four integers in the
                range of 0 to 255, got %s
                ''',
                repr(ip_string)
            ))

        return struct.pack(b'!BBBB', *ints)

    error = False
    omitted = ip_string.count('::')
    if omitted > 1:
        error = True
    elif omitted == 0:
        octets = ip_string.split(':')
        error = len(octets) != 8
    else:
        begin, end = ip_string.split('::')
        begin_octets = begin.split(':')
        end_octets = end.split(':')
        missing = 8 - len(begin_octets) - len(end_octets)
        octets = begin_octets + (['0'] * missing) + end_octets

    if not error:
        ints = []
        for o in octets:
            o = int(o, 16)
            if o > 65535 or o < 0:
                error = True
                break
            ints.append(o)

        return struct.pack(b'!HHHHHHHH', *ints)

    raise ValueError(unwrap(
        '''
        ip_string must be a valid ipv6 string, got %s
        ''',
        repr(ip_string)
    ))

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