// Try to get a single packet from a stream of data.
// Returns 0 if the packet was successfully processed, or
// -1 on an error, in which case the state is unchanged.
static ssize_t
dataReceivedSingle(NetConnection *conn, const uint8 *data,
size_t dataLen) {
uint32 packetLen;
PacketType type;
int result;
if (dataLen < sizeof (PacketHeader)) {
// Incomplete packet. We'll have to wait for the rest.
return 0;
}
packetLen = packetLength((const Packet *) data);
type = packetType((const Packet *) data);
if (!validPacketType(type)) {
log_add(log_Warning, "Packet with invalid type %d received.\n", type);
errno = EBADMSG;
return -1;
}
if (packetLen < packetTypeData[type].len) {
// Bad len field of packet.
log_add(log_Warning, "Packet with bad length field received (type="
"%s, lenfield=%d.\n", packetTypeData[type].name,
packetLen);
errno = EBADMSG;
return -1;
}
if (dataLen < packetLen) {
// Incomplete packet. We'll have to wait for the rest.
return 0;
}
#ifdef NETPLAY_STATISTICS
NetConnection_getStatistics(conn)->packetsReceived++;
NetConnection_getStatistics(conn)->packetTypeReceived[type]++;
#endif
#ifdef NETPLAY_DEBUG
if (type != PACKET_BATTLEINPUT && type != PACKET_CHECKSUM) {
// Reporting BattleInput and Checksum would get so spammy that it
// would slow down the battle.
log_add(log_Debug, "NETPLAY: [%d] <== Received packet of type %s.\n",
NetConnection_getPlayerNr(conn), packetTypeData[type].name);
}
#endif
result = packetTypeData[type].handler(conn, data);
if (result == -1) {
// An error occured. errno is set by the handler.
return -1;
}
return packetLen;
}
//-----------------------------------------------------------------------------
// checks the packetLength according to the data unit's buffer size
bool CCSDS::PACKET::Packet::checkPacketLength() const throw(UTIL::Exception)
//-----------------------------------------------------------------------------
{
return (packetLength() == (bufferSize() - PRIMARY_HEADER_BYTE_SIZE - 1));
}
//-----------------------------------------------------------------------------
// sets the packetLength according to the data unit's buffer size
void CCSDS::PACKET::Packet::setPacketLength() throw(UTIL::Exception)
//-----------------------------------------------------------------------------
{
packetLength(bufferSize() - PRIMARY_HEADER_BYTE_SIZE - 1);
}
