void unpackCharacters(char characters[], unsigned pack)
{
    characters[0] = pack;
    characters[0] &= MASK1;
    characters[0] >>= 8;

    characters[1] = pack;
    characters[1] &= MASK2;
    characters[1] >>= 8;

    characters[2] = pack;
    characters[2] &= MASK3;
    characters[2] >>= 8;

    characters[3] = pack;
    characters[3] &= MASK4;
    characters[3] >>= 8;
}