# Source code for M2Crypto.SSL.timeout

    """Support for SSL socket timeouts.

    Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved.

    Copyright 2008 Heikki Toivonen. All rights reserved.
    """

    __all__ = ['DEFAULT_TIMEOUT', 'timeout', 'struct_to_timeout', 'struct_size']

    import sys
    import struct

    DEFAULT_TIMEOUT = 600  # type: int

    class timeout(object):

        def __init__(self, sec=DEFAULT_TIMEOUT, microsec=0):
            # type: (int, int) -> None
            self.sec = sec
            self.microsec = microsec

        def pack(self):
            if sys.platform == 'win32':
                millisec = int(self.sec * 1000 + round(float(self.microsec) / 1000))
                binstr = struct.pack('l', millisec)
            else:
                binstr = struct.pack('ll', self.sec, self.microsec)
            return binstr

    def struct_to_timeout(binstr):
        # type: (bytes) -> timeout
        if sys.platform == 'win32':
            millisec = struct.unpack('l', binstr)[0]
            # On py3, int/int performs exact division and returns float. We want
            # the whole number portion of the exact division result:
            sec = int(millisec / 1000)
            microsec = (millisec % 1000) * 1000
        else:
            (sec, microsec) = struct.unpack('ll', binstr)
        return timeout(sec, microsec)

    def struct_size():
        # type: () -> int
        if sys.platform == 'win32':
            return struct.calcsize('l')
        else:
            return struct.calcsize('ll')