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Dir : ~/lib/python3/dist-packages/hyperlink/

View File Name : _socket.py

try:
    from socket import inet_pton
except ImportError:
    from typing import TYPE_CHECKING

    if TYPE_CHECKING:  # pragma: no cover
        pass
    else:
        # based on https://gist.github.com/nnemkin/4966028
        # this code only applies on Windows Python 2.7
        import ctypes
        import socket

        class SockAddr(ctypes.Structure):
            _fields_ = [
                ("sa_family", ctypes.c_short),
                ("__pad1", ctypes.c_ushort),
                ("ipv4_addr", ctypes.c_byte * 4),
                ("ipv6_addr", ctypes.c_byte * 16),
                ("__pad2", ctypes.c_ulong),
            ]

        WSAStringToAddressA = ctypes.windll.ws2_32.WSAStringToAddressA
        WSAAddressToStringA = ctypes.windll.ws2_32.WSAAddressToStringA

        def inet_pton(address_family, ip_string):
            # type: (int, str) -> bytes
            addr = SockAddr()
            ip_string_bytes = ip_string.encode("ascii")
            addr.sa_family = address_family
            addr_size = ctypes.c_int(ctypes.sizeof(addr))

            try:
                attribute, size = {
                    socket.AF_INET: ("ipv4_addr", 4),
                    socket.AF_INET6: ("ipv6_addr", 16),
                }[address_family]
            except KeyError:
                raise socket.error("unknown address family")

            if (
                WSAStringToAddressA(
                    ip_string_bytes,
                    address_family,
                    None,
                    ctypes.byref(addr),
                    ctypes.byref(addr_size),
                )
                != 0
            ):
                raise socket.error(ctypes.FormatError())

            return ctypes.string_at(getattr(addr, attribute), size)