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"""
This module defines helper functions used in unit tests.
"""

from __future__ import absolute_import, division, print_function
import ctypes


def ctypes_ref_set_int(ref, num):
    "Assigns an integer to a ctypes reference to an integer."

    cnum = ctypes.c_int(num)
    ctypes.memmove(ref, ctypes.addressof(cnum), ctypes.sizeof(cnum))


def ctypes_ref_set_uint(ref, num):
    "Assigns an integer to a ctypes reference to an unsigned integer."

    cnum = ctypes.c_uint(num)
    ctypes.memmove(ref, ctypes.addressof(cnum), ctypes.sizeof(cnum))


def ctypes_build_array(arr):
    "Builds ctypes array out of ctypes objects."

    arr_c = (type(arr[0]) * len(arr))(*arr)
    return arr_c