Someone

static void UpdateNumber(int index, long num) {
    unsigned long l = num;
    unsigned char b[4];
    b[0] = (unsigned char)(l & 0xFF);
    b[1] = (unsigned char)((l >> 8) & 0xFF);
    b[2] = (unsigned char)((l >> 16) & 0xFF);
    b[3] = (unsigned char)((l >> 24) & 0xFF);

    if (cache[index].obj != 0)
        free(cache[index].obj);
    cache[index].obj = malloc(4);
    memcpy(cache[index].obj, b, 4);
}