- memcpy(&tmp, &packet->data[0], sizeof tmp);
- memcpy(&packet->data[0], &packet->data[6], sizeof tmp);
- memcpy(&packet->data[6], &tmp, sizeof tmp);
+ memcpy(&tmp, &packet->data[0], sizeof(tmp));
+ memcpy(&packet->data[0], &packet->data[6], sizeof(tmp));
+ memcpy(&packet->data[6], &tmp, sizeof(tmp));