def get_binary_stdio(stream):
    """ Return the specified standard input, output or errors stream as a
    'raw' buffer object suitable for reading/writing binary data from/to it.
    """
    assert stream in ['stdin', 'stdout', 'stderr'], 'invalid stream name'
    stdio = getattr(sys, stream)
    if sys.version_info[0] < 3:
        if sys.platform == 'win32':
            # set I/O stream binary flag on python2.x (Windows)
            runtime = platform.python_implementation()
            if runtime == 'PyPy':
                # the msvcrt trick doesn't work in pypy, so I use fdopen
                mode = 'rb' if stream == 'stdin' else 'wb'
                stdio = os.fdopen(stdio.fileno(), mode, 0)
            else:
                # this works with CPython -- untested on other implementations
                import msvcrt
                msvcrt.setmode(stdio.fileno(), os.O_BINARY)
        return stdio
    else:
        # get 'buffer' attribute to read/write binary data on python3.x
        if hasattr(stdio, 'buffer'):
            return stdio.buffer
        else:
            orig_stdio = getattr(sys, '__%s__' % stream)
            return orig_stdio.buffer