C++ PacketReader::read8方法代码示例

bool WSSession::buildPacket(PacketReader& packet) {
	if (packet.available()<2)
		return false;
	UInt8 type = packet.read8() & 0x0F;
	UInt8 lengthByte = packet.read8();

	UInt32 size=lengthByte&0x7f;
	if (size==127) {
		if (packet.available()<8)
			return false;
		size = (UInt32)packet.read64();
	} else if (size==126) {
		if (packet.available()<2)
			return false;
		size = packet.read16();
	}

	if(lengthByte&0x80)
		size += 4;

	if (packet.available()<size)
		return false;

	packet.shrink(size);

	if (lengthByte & 0x80) {
		shared_ptr<WSUnmasking> pWSUnmasking(new WSUnmasking(invoker, packet.current(),packet.available(), type));
		decode<WSUnmasking>(pWSUnmasking);
	} else {
		packet.reset(packet.position()-1);
		*(UInt8*)packet.current() = type;
	}
	return true;
}

void Handshake::packetHandler(PacketReader& packet) {

	UInt8 marker = packet.read8();
	if(marker!=0x0b) {
		ERROR("Marker handshake wronk : must be '0B' and not '%02x'",marker);
		return;
	}
	
	UInt16 time = packet.read16();
	UInt8 id = packet.read8();
	packet.shrink(packet.read16()); // length

	PacketWriter& packetOut = writer();
	UInt8 idResponse=0;
	{
		PacketWriter response(packetOut,3);
		idResponse = handshakeHandler(id,packet,response);
		if(idResponse==0)
			return;
	}

	packetOut << (UInt8)idResponse;
	packetOut << (UInt16)(packetOut.length()-packetOut.position()-2);

	send(true);
	// reset farid to 0!
	_farId=0;
}

void Handshake::packetHandler(PacketReader& packet) {

	UInt8 marker = packet.read8();
	if(marker!=0x0b) {
		ERROR("Marker handshake wrong : should be 0b and not %u",marker);
		return;
	}
	
	UInt16 time = packet.read16();
	UInt8 id = packet.read8();
	packet.shrink(packet.read16()); // length

	PacketWriter& response(writer());
	UInt32 pos = response.position();
	response.next(3);
	UInt8 idResponse = handshakeHandler(id,packet,response);
	response.reset(pos);
	if(idResponse>0) {
		response.write8(idResponse);
		response.write16(response.length()-response.position()-2);
		flush();
	}

	// reset farid to 0!
	(UInt32&)farId=0;
}

void ServerConnection::packetHandler(PacketReader& packet) {

	UInt8 marker = packet.read8();
	if(marker!=0x0b) {
		ERROR("ServerConnection with an unknown %u marker, it should be 0x0b",marker);
		return;
	}

	packet.next(2);
	UInt8 id = packet.read8();
	switch(id) {
		case 0x71: {
			packet.next(2);
			string tag;
			packet.readString8(tag);
			map<string,P2PHandshakerAddress>::iterator it = _p2pHandshakers.find(tag);
			if(it==_p2pHandshakers.end()) {
				ERROR("Unknown ServerConnection tag %s on P2P handshake",tag.c_str());
				break;
			}

			(SocketAddress&)_handshake.peer.address = it->second;
			packet.reset(0);
			PacketWriter writer(packet.current(),packet.available()+16); // +16 for futur 0xFFFF padding
			writer.clear(packet.available());
			_handshake.send(writer);
			_p2pHandshakers.erase(it);

			break;
		}
		case 0x40: {
			if(!_connected) {
				// Edge hello response
				_connected=true;
				return;
			}
			// Edge keepalive
			PacketWriter& packet(writer());
			packet.write8(0x41);
			packet.write16(0);
			flush();
			INFO("Keepalive RTMFP server");
			break;
		}
		case 0x45: {
			// Server is death!
			(bool&)died=true;
			break;
		}
		default:
			ERROR("Unkown ServerConnection packet id %u",id);
	}


}

AMF::ContentType RTMFPFlow::unpack(PacketReader& packet,UInt32& time) {
	if(packet.available()==0)
		return AMF::EMPTY;
	AMF::ContentType type = (AMF::ContentType)packet.read8();
	switch(type) {
		// amf content
		case AMF::INVOCATION_AMF3:
			packet.next(1);
		case AMF::INVOCATION:
			packet.next(4);
			return AMF::INVOCATION;
		case AMF::AUDIO:
		case AMF::VIDEO:
			time = packet.read32();
			break;
		case AMF::DATA:
			packet.next(1);
		case AMF::RAW:
			packet.next(4);
		case AMF::CHUNKSIZE:
			break;
		default:
			ERROR("Unpacking type '",Format<UInt8>("%02x",(UInt8)type),"' unknown");
			break;
	}
	return type;
}

Message::Type Flow::unpack(PacketReader& reader) {
	if(reader.available()==0)
		return Message::EMPTY;
	Message::Type type = (Message::Type)reader.read8();
	switch(type) {
		// amf content
		case 0x11:
			reader.next(1);
		case Message::AMF_WITH_HANDLER:
			reader.next(4);
			return Message::AMF_WITH_HANDLER;
		case Message::AMF:
			reader.next(5);
		case Message::AUDIO:
		case Message::VIDEO:
			break;
		// raw data
		case 0x04:
			reader.next(4);
		case 0x01:
			break;
		default:
			ERROR("Unpacking type '%02x' unknown",type);
			break;
	}
	return type;
}

void RTMFPHandshake::packetHandler(PacketReader& packet) {

	UInt8 marker = packet.read8();
	if(marker!=0x0b) {
		ERROR("Marker handshake wrong : should be 0b and not ",Format<UInt8>("%.2x",marker));
		return;
	}
	
	UInt16 time = packet.read16();
	UInt8 id = packet.read8();
	packet.shrink(packet.read16()); // length

	PacketWriter& response(this->packet());
	UInt32 oldSize(response.size());
	response.next(3); // type and size
	UInt8 idResponse = handshakeHandler(id,packet,response);
	if(idResponse>0)
		BinaryWriter(response,oldSize).write8(idResponse).write16(response.size()-oldSize-3);
	else
		response.clear(oldSize);
}

void RTMFPSession::packetHandler(PacketReader& packet) {

	_recvTimestamp.update();

	// Read packet
	UInt8 marker = packet.read8()|0xF0;
	
	_timeSent = packet.read16();

	// with time echo
	if(marker == 0xFD) {
		UInt16 time = RTMFP::TimeNow();
		UInt16 timeEcho = packet.read16();
		if(timeEcho>time) {
			if(timeEcho-time<30)
				time=0;
			else
				time += 0xFFFF-timeEcho;
			timeEcho = 0;
		}
		peer.setPing((time-timeEcho)*RTMFP_TIMESTAMP_SCALE);
	}
	else if(marker != 0xF9)
		WARN("RTMFPPacket marker unknown : ", Format<UInt8>("%02x",marker));


	// Variables for request (0x10 and 0x11)
	UInt8 flags;
	RTMFPFlow* pFlow=NULL;
	UInt64 stage=0;
	UInt64 deltaNAck=0;

	UInt8 type = packet.available()>0 ? packet.read8() : 0xFF;
	bool answer = false;

	// Can have nested queries
	while(type!=0xFF) {

		UInt16 size = packet.read16();

		PacketReader message(packet.current(),size);		

		switch(type) {
			case 0x0c :
				fail("failed on client side");
				break;

			case 0x4c :
				/// Session death!
				_failed = true; // to avoid the fail signal!!
				kill();
				return;

			/// KeepAlive
			case 0x01 :
				if(!peer.connected)
					fail("Timeout connection client");
				else
					writeMessage(0x41,0);
			case 0x41 :
				_timesKeepalive=0;
				break;

			case 0x5e : {
				// RTMFPFlow exception!
				UInt64 id = message.read7BitLongValue();
				
				RTMFPWriter* pRTMFPWriter = writer(id);
				if(pRTMFPWriter)
					pRTMFPWriter->fail("Writer rejected on session ",name());
				else
					WARN("RTMFPWriter ", id, " unfound for failed signal on session ", name());
				break;

			}
			case 0x18 :
				/// This response is sent when we answer with a Acknowledgment negative
				// It contains the id flow
				// I don't unsertand the usefulness...
				//pFlow = &flow(message.read8());
				//stage = pFlow->stageSnd();
				// For the moment, we considerate it like a exception
				fail("ack negative from server"); // send fail message immediatly
				break;

			case 0x51 : {
				/// Acknowledgment
				UInt64 id = message.read7BitLongValue();
				RTMFPWriter* pRTMFPWriter = writer(id);
				if(pRTMFPWriter)
					pRTMFPWriter->acknowledgment(message);
				else
					WARN("RTMFPWriter ",id," unfound for acknowledgment on session ",name());
				break;
			}
			/// Request
			// 0x10 normal request
			// 0x11 special request, in repeat case (following stage request)
			case 0x10 : {
				flags = message.read8();
//.........这里部分代码省略.........

void WSSession::packetHandler(PacketReader& packet) {
	UInt8 type = 0;
	Exception ex;
	if(peer.connected) {
		type = packet.read8();	
		
		switch(type) {
			case WS::TYPE_BINARY: {
				RawReader reader(packet);
				peer.onMessage(ex, "onMessage",reader,WS::TYPE_BINARY);
				break;
			}
			case WS::TYPE_TEXT: {
				if(!JSONReader::IsValid(packet)) {
					RawReader reader(packet);
					peer.onMessage(ex, "onMessage",reader);
					break;
				}
				JSONReader reader(packet);
				if(reader.followingType()!=JSONReader::STRING) {
					peer.onMessage(ex, "onMessage",reader);
					break;
				}
				string name;
				reader.readString(name);
				if(name=="__publish") {
					if(reader.followingType()!=JSONReader::STRING) {
						ex.set(Exception::PROTOCOL, "__publish method takes a stream name in first parameter",WS::CODE_MALFORMED_PAYLOAD);
						break;
					}
					reader.readString(name);
					if(_pPublication)
						invoker.unpublish(peer,_pPublication->name());
					_pPublication = invoker.publish(ex, peer,name);
				} else if(name=="__play") {
					if(reader.followingType()!=JSONReader::STRING) {
						ex.set(Exception::PROTOCOL, "__play method takes a stream name in first parameter",WS::CODE_MALFORMED_PAYLOAD);
						break;
					}
					reader.readString(name);
					
					closeSusbcription();
				} else if(name=="__closePublish") {
					closePublication();
				} else if(name=="__closePlay") {
					closeSusbcription();
				} else if (name == "__close") {
					closePublication();
					closeSusbcription();
					
				} else if(_pPublication) {
					reader.reset();
					_pPublication->pushData(reader);
				} else
					peer.onMessage(ex, name,reader);
				break;
			}
			case WS::TYPE_CLOSE:
				_writer.close(packet.available() ? packet.read16() : 0);
				break;
			case WS::TYPE_PING:
				_writer.writePong(packet.current(),packet.available());
				break;
			case WS::TYPE_PONG:
				peer.setPing(_writer.ping = (UInt16)(_time.elapsed()/1000));
				break;
			default:
				ex.set(Exception::PROTOCOL, Format<UInt8>("Type %#x unknown", type), WS::CODE_MALFORMED_PAYLOAD);
				break;
		}
		
		if (ex) {
			ERROR(ex.error());
			_writer.close((ex.code()==Exception::APPLICATION || ex.code() == Exception::SOFTWARE) ? WS::CODE_PROTOCOL_ERROR : ex.code());	
		}
		
	}

	if(!peer.connected || type==WS::TYPE_CLOSE)
		kill();
	else
		_writer.flush();
}

void Middle::targetPacketHandler(PacketReader& packet) {

	if(_firstResponse)
		((Timestamp&)peer.lastReceptionTime).update(); // To emulate a long ping corresponding, otherwise client send multiple times each packet
	_firstResponse = false;

	UInt8 marker = packet.read8();
	
	_timeSent = packet.read16(); // time

	UInt16 timeEcho(0);
	if((marker|0xF0) == 0xFE)
		timeEcho = packet.read16(); // time echo

	PacketWriter& packetOut = writer();

	int pos = packetOut.position();

	UInt8 type = packet.available()>0 ? packet.read8() : 0xFF;

	UInt64 idFlow,stage;
	UInt8 nbPeerSent = 0;

	while(type!=0xFF) {
		int posType = packetOut.position();
		packetOut.write8(type);

		UInt16 size = packet.read16();
		PacketReader content(packet.current(),size);packetOut.write16(size);

		if(type==0x10 || type==0x11) {
			UInt8 flag = content.read8();packetOut.write8(flag);
			if(type==0x10) {
				idFlow = content.read7BitLongValue();packetOut.write7BitLongValue(idFlow);
				stage = content.read7BitLongValue();packetOut.write7BitLongValue(stage);
				packetOut.write7BitLongValue(content.read7BitLongValue());
			} else
				++stage;
			
			if(!(flag&MESSAGE_WITH_BEFOREPART)) {

				if(flag&MESSAGE_HEADER) {
					UInt8 len = content.read8(); packetOut.write8(len);
					while(len!=0) {
						packetOut.writeRaw(content.current(),len);
						content.next(len);
						len = content.read8(); packetOut.write8(len);
					}
				}

				UInt8 flagType = content.read8(); packetOut.write8(flagType);
				if(flagType==0x09) {
					UInt32 time = content.read32(); packetOut.write32(time);
					TRACE("Timestamp/Flag video : %u/%2x",time,*content.current());
				} else if(flagType==0x08) {
					UInt32 time = content.read32(); packetOut.write32(time);
					TRACE("Timestamp/Flag audio : %u/%2x",time,*content.current());
				} else if(flagType==0x04) {
					packetOut.write32(content.read32());
					UInt16 a = content.read16();packetOut.write16(a);
					UInt32 b = content.read32(); packetOut.write32(b);
					if(content.available()>0) {
						UInt32 c = content.read32(); packetOut.write32(c);
						if(a!=0x22) {
							DEBUG("Raw %llu : %.2x %u %u",idFlow,a,b,c)
						} else {
							TRACE("Bound %llu : %.2x %u %u",idFlow,a,b,c);
						}
					} else
						DEBUG("Raw %llu : %.2x %u",idFlow,a,b)
					
				/*	if(a==0x1F) {
						packetOut.reset(posType);
						content.next(content.available());
					}*/
				}

void Middle::packetHandler(PacketReader& packet) {
	if(!_pMiddleAesEncrypt)
		manage(); // to wait the target handshake response

	// Middle to target
	PacketWriter& request = requester();

	UInt8 marker = packet.read8();
	request << marker;

	request << packet.read16();

	if((marker|0xF0) == 0xFD)
		request.write16(packet.read16()); // time echo

	int pos = request.position();

	UInt8 type = packet.available()>0 ? packet.read8() : 0xFF;
	while(type!=0xFF) {
		UInt16 size = packet.read16();
		PacketReader content(packet.current(),size);

		PacketWriter out(request.begin()+request.position(),request.available()); // 3 for future type and size
		out.clear(3);

		if(type==0x10) {

			out.write8(content.read8());
			UInt64 idFlow = content.read7BitLongValue();out.write7BitLongValue(idFlow);
			UInt64 stage = content.read7BitLongValue();out.write7BitLongValue(stage);

			if(idFlow==0x02 && stage==0x01) {
				if(!_isPeer) {
				
					/// Replace NetConnection infos

					out.writeRaw(content.current(),14);content.next(14);

					// first string
					string tmp;
					content.readString16(tmp);out.writeString16(tmp);

					AMFWriter writer(out);
					writer.amf0Preference=true;
					AMFReader reader(content);
					writer.writeNumber(reader.readNumber()); // double
					
					AMFSimpleObject obj;
					reader.readSimpleObject(obj);
					
					/// Replace tcUrl
					if(obj.has("tcUrl"))
						obj.setString("tcUrl",_queryUrl);
					
					writer.writeSimpleObject(obj);

				} else {

					out.writeRaw(content.current(),3);content.next(3);
					UInt16 netGroupHeader = content.read16();out.write16(netGroupHeader);
					if(netGroupHeader==0x4752) {

						map<string,string>::const_iterator it = peer.properties.find("groupspec");
						if(it!=peer.properties.end()) {
							out.writeRaw(content.current(),71);content.next(71);
							UInt8 result1[AES_KEY_SIZE];
							UInt8 result2[AES_KEY_SIZE];
							HMAC(EVP_sha256(),&_sharedSecret[0],_sharedSecret.size(),&_targetNonce[0],_targetNonce.size(),result1,NULL);
							HMAC(EVP_sha256(),it->second.c_str(),it->second.size(),result1,AES_KEY_SIZE,result2,NULL);
							out.writeRaw(result2,AES_KEY_SIZE);content.next(AES_KEY_SIZE);
							out.writeRaw(content.current(),4);content.next(4);
							out.writeRaw(_target.peerId,ID_SIZE);content.next(ID_SIZE);
						} else
							WARN("No groupspec client property indicated to make working the 'man-in-the-middle' mode between peers in a NetGroup case");
						
					}
				}
			}

		}  else if(type == 0x4C) {
			 kill();
			 return;
		}  else if(type == 0x51) {
			//printf("%s\n",Util::FormatHex(content.current(),content.available()).c_str());
		}
		out.writeRaw(content.current(),content.available());

		packet.next(size);

		if(out.length()>=3) {
			request<<type;
			size = out.length()-3;
			request.write16(size);request.next(size);
		}


		type = packet.available()>0 ? packet.read8() : 0xFF;
	}

	if(request.length()>pos)
//.........这里部分代码省略.........

UInt8 RTMFPHandshake::handshakeHandler(UInt8 id,PacketReader& request,PacketWriter& response) {

	switch(id){
		case 0x30: {
			
			request.next(1);
			UInt8 epdLen = request.read8()-1;

			UInt8 type = request.read8();

			string epd;
			request.readRaw(epdLen,epd);

			string tag;
			request.readRaw(16,tag);
			response.writeString8(tag);
			
			if(type == 0x0f) {

				const UInt8* peerId = (const UInt8*)epd.c_str();
				
				RTMFPSession* pSessionWanted = _sessions.find<RTMFPSession>(peerId);
	
				if(pSessionWanted) {
					if(pSessionWanted->failed())
						return 0x00; // TODO no way in RTMFP to tell "died!"
					/// Udp hole punching
					UInt32 times = attempt(tag);

					RTMFPSession* pSession(NULL);
					if(times > 0 || peer.address.host() == pSessionWanted->peer.address.host())
						pSession = _sessions.find<RTMFPSession>(peer.address);
					
					pSessionWanted->p2pHandshake(tag,peer.address,times,pSession);

					RTMFP::WriteAddress(response,pSessionWanted->peer.address, RTMFP::ADDRESS_PUBLIC);
					DEBUG("P2P address initiator exchange, ",pSessionWanted->peer.address.toString());
					for(const SocketAddress& address : pSessionWanted->peer.localAddresses) {
						RTMFP::WriteAddress(response,address, RTMFP::ADDRESS_LOCAL);
						DEBUG("P2P address initiator exchange, ",address.toString());
					}

					// add the turn address (RelayServer) if possible and required
					if (pSession && times>0) {
						UInt8 timesBeforeTurn(0);
						if(pSession->peer.parameters().getNumber("timesBeforeTurn",timesBeforeTurn) && timesBeforeTurn>=times) {
							UInt16 port = invoker.relayer.relay(pSession->peer.address,pSessionWanted->peer.address,20); // 20 sec de timeout is enough for RTMFP!
							if(port>0) {
								Exception ex;
								SocketAddress address;
								string addr;
								SocketAddress::Split(pSession->peer.serverAddress,addr);
								bool success(false);
								EXCEPTION_TO_LOG(success=address.set(ex,addr, port),"RTMFP turn impossible")
								if (success)
									RTMFP::WriteAddress(response,address, RTMFP::ADDRESS_REDIRECTION);
							} // else ERROR already display by RelayServer class
						}
					}
					return 0x71;
				}


				DEBUG("UDP Hole punching, session ", Util::FormatHex(peerId, ID_SIZE, LOG_BUFFER), " wanted not found")
				set<SocketAddress> addresses;
				peer.onRendezVousUnknown(peerId,addresses);
				set<SocketAddress>::const_iterator it;
				for(it=addresses.begin();it!=addresses.end();++it) {
					if(it->host().isWildcard())
						continue;
					if(peer.address == *it)
						WARN("A client tries to connect to himself (same ",peer.address.toString()," address)");
					RTMFP::WriteAddress(response,*it,RTMFP::ADDRESS_REDIRECTION);
					DEBUG("P2P address initiator exchange, ",it->toString());
				}
				return addresses.empty() ? 0 : 0x71;
			}

UInt8 Handshake::handshakeHandler(UInt8 id,PacketReader& request,PacketWriter& response) {

	switch(id){
		case 0x30: {
			
			request.read8(); // passer un caractere (boite dans boite)
			UInt8 epdLen = request.read8()-1;

			UInt8 type = request.read8();

			string epd;
			request.readRaw(epdLen,epd);

			string tag;
			request.readRaw(16,tag);
			response.writeString8(tag);
			
			if(type == 0x0f)
				return _gateway.p2pHandshake(tag,response,peer.address,(const UInt8*)epd.c_str());

			if(type == 0x0a){
				/// Handshake
				HelloAttempt& attempt = helloAttempt<HelloAttempt>(tag);
				if(edges().size()>0 && (_invoker.edgesAttemptsBeforeFallback==0 || attempt.count <_invoker.edgesAttemptsBeforeFallback)) {
					
					if(_invoker.edgesAttemptsBeforeFallback>0) {
						try {
							URI uri(epd);
							response.writeAddress(SocketAddress(uri.getHost(),uri.getPort()),false); // TODO check with true!
						} catch(Exception& ex) {
							ERROR("Parsing %s URL problem in hello attempt : %s",epd.c_str(),ex.displayText().c_str());
						}
					}

					map<int,list<Edge*> > edgesSortedByCount;
					map<string,Edge*>::const_iterator it;
					for(it=edges().begin();it!=edges().end();++it)
						edgesSortedByCount[it->second->count].push_back(it->second);

					UInt8 count=0;
					map<int,list<Edge*> >::const_iterator it2;
					for(it2=edgesSortedByCount.begin();it2!=edgesSortedByCount.end();++it2) {
						list<Edge*>::const_iterator it3;
						for(it3=it2->second.begin();it3!=it2->second.end();++it3) {
							response.writeAddress((*it3)->address,false);
							if((++count)==6) // 6 redirections maximum
								break;
						}
						if(it3!=it2->second.end())
							break;
					}
					return 0x71;

				}

				if(edges().size()>0)
					WARN("After %u hello attempts, impossible to connect to edges. Edges are busy? or unreachable?",_invoker.edgesAttemptsBeforeFallback);
	
				// New Cookie
				createCookie(response,attempt,tag,epd);
				 
				// instance id (certificat in the middle)
				response.writeRaw(_certificat,sizeof(_certificat));
				
				return 0x70;
			} else
				ERROR("Unkown handshake first way with '%02x' type",type);
			break;
		}
		case 0x39:
		case 0x38: {
			(UInt32&)farId = request.read32();

			if(request.read7BitLongValue()!=COOKIE_SIZE) {
				ERROR("Bad handshake cookie '%s': its size should be 64 bytes",Util::FormatHex(request.current(),COOKIE_SIZE).c_str());
				return 0;
			}
	
			map<const UInt8*,Cookie*,CompareCookies>::iterator itCookie = _cookies.find(request.current());
			if(itCookie==_cookies.end()) {
				if(id!=0x39) {
					ERROR("Handshake cookie '%s' unknown",Util::FormatHex(request.current(),COOKIE_SIZE).c_str());
					return 0;
				}
				Cookie* pCookie = new Cookie();
				UInt32 pos = request.position();
				request.readRaw((UInt8*)pCookie->value,COOKIE_SIZE);
				request >> (string&)pCookie->queryUrl;
				request.reset(pos);
				itCookie = _cookies.insert(pair<const UInt8*,Cookie*>(pCookie->value,pCookie)).first;
			}

			Cookie& cookie(*itCookie->second);

			if(cookie.id==0) {

				UInt8 decryptKey[AES_KEY_SIZE];UInt8* pDecryptKey=&decryptKey[0];
				UInt8 encryptKey[AES_KEY_SIZE];UInt8* pEncryptKey=&encryptKey[0];

				if(id==0x38) {
//.........这里部分代码省略.........

void Session::packetHandler(PacketReader& packet) {

	_recvTimestamp.update();

	// Read packet
	UInt8 marker = packet.read8()|0xF0;
	
	_timeSent = packet.read16();

	// with time echo
	if(marker == 0xFD)
		_peer.setPing(RTMFP::Time(_recvTimestamp.epochMicroseconds())-packet.read16());
	else if(marker != 0xF9)
		WARN("Packet marker unknown : %02x",marker);


	// Variables for request (0x10 and 0x11)
	UInt8 flags;
	Flow* pFlow=NULL;
	UInt32 stage=0;
	UInt32 deltaNAck=0;

	UInt8 type = packet.available()>0 ? packet.read8() : 0xFF;
	bool answer = false;

	// Can have nested queries
	while(type!=0xFF) {

		UInt16 size = packet.read16();

		PacketReader message(packet.current(),size);		

		switch(type) {
			case 0x0c :
				fail("Session failed on the client side");
				break;

			case 0x4c :
				/// Session death!
				kill();
				break;

			/// KeepAlive
			case 0x01 :
				writeMessage(0x41,0);
			case 0x41 :
				_timesKeepalive=0;
				break;

			case 0x5e : {
				// Flow exception!
				UInt32 id = message.read7BitValue();
				
				FlowWriter* pFlowWriter = flowWriter(id);
				if(pFlowWriter)
					pFlowWriter->fail("receiver has rejected the flow");
				else
					WARN("FlowWriter %u unfound for failed signal",id);
				break;

			}
			case 0x18 :
				/// This response is sent when we answer with a Acknowledgment negative
				// It contains the id flow
				// I don't unsertand the usefulness...
				//pFlow = &flow(message.read8());
				//stage = pFlow->stageSnd();
				// For the moment, we considerate it like a exception
				fail("ack negative from server"); // send fail message immediatly
				break;

			case 0x51 : {
				/// Acknowledgment
				UInt32 id = message.read7BitValue();
				FlowWriter* pFlowWriter = flowWriter(id);
				if(pFlowWriter) {
					UInt8 ack = message.read8();
					while(ack==0xFF)
						ack = message.read8();
					if(ack>0)
						pFlowWriter->acknowledgment(message.read7BitValue());
					else {
						// In fact here, we should send a 0x18 message (with id flow),
						// but it can create a loop... We prefer the following behavior
						pFlowWriter->fail("ack negative from client");
					}

				} else
					WARN("FlowWriter %u unfound for acknowledgment",id);
				break;
			}
			/// Request
			// 0x10 normal request
			// 0x11 special request, in repeat case (following stage request)
			case 0x10 : {
				flags = message.read8();
				UInt32 idFlow = message.read7BitValue();
				stage = message.read7BitValue()-1;
				deltaNAck = message.read7BitValue()-1;

//.........这里部分代码省略.........

void Middle::targetPacketHandler(PacketReader& packet) {

	if(_firstResponse)
		_recvTimestamp.update(); // To emulate a long ping corresponding, otherwise client send multiple times each packet
	_firstResponse = false;

	UInt8 marker = packet.read8();
	
	UInt16 timestamp = packet.read16(); // time

	if((marker|0xF0) == 0xFE)
		_timeSent = packet.read16(); // time echo

	PacketWriter& packetOut = writer();

	int pos = packetOut.position();

	UInt8 type = packet.available()>0 ? packet.read8() : 0xFF;

	UInt32 idFlow,stage;
	UInt8 nbPeerSent = 0;

	while(type!=0xFF) {
		int posType = packetOut.position();
		packetOut.write8(type);

		UInt16 size = packet.read16();
		PacketReader content(packet.current(),size);packetOut.write16(size);
		
		if(type==0x10 || type==0x11) {
			UInt8 flag = content.read8();packetOut.write8(flag);
			if(type==0x10) {
				idFlow = content.read7BitValue();packetOut.write7BitValue(idFlow);
				stage = content.read7BitValue();packetOut.write7BitValue(stage);
			} else
				++stage;

			packetOut.write7BitValue(content.read7BitValue());
			
			if(!(flag&MESSAGE_WITH_BEFOREPART)) {

				if(flag&MESSAGE_HEADER) {
					UInt8 len = content.read8(); packetOut.write8(len);
					while(len!=0) {
						packetOut.writeRaw(content.current(),len);
						content.next(len);
						len = content.read8(); packetOut.write8(len);
					}
				}

				UInt8 flagType = content.read8(); packetOut.write8(flagType);
				if(flagType==0x09) {
					UInt32 time = content.read32(); packetOut.write32(time);
					//TRACE("Timestamp/Flag video : %u/%2x",time,*content.current());
				} else if(flagType==0x08) {
					UInt32 time = content.read32(); packetOut.write32(time);
					//TRACE("Timestamp/Flag audio : %u/%2x",time,*content.current());
				} else if(flagType==0x04) {
					packetOut.write32(content.read32());
					UInt16 a = content.read16(); packetOut.write16(a);
					UInt32 b = content.read32(); packetOut.write32(b);
					UInt32 c = content.read32(); packetOut.write32(c);
					//TRACE("Bound %u : %u %u %u",idFlow,a,b,c);
				}

				if(flagType==0x0b && stage==0x01 && ((marker==0x4e && idFlow==0x03) || (marker==0x8e && idFlow==0x05))) {
					/// Replace "middleId" by "peerId"	

					UInt8 middlePeerIdWanted[ID_SIZE];
					content.readRaw(middlePeerIdWanted,ID_SIZE);

					++nbPeerSent;

					Sessions::Iterator it;
					for(it=_sessions.begin();it!=_sessions.end();++it) {
						Middle* pMiddle = (Middle*)it->second;
						if(pMiddle->middlePeer() == middlePeerIdWanted) {
							memcpy(middlePeerIdWanted,pMiddle->peer.id,ID_SIZE);
							break;
						}
					}
					packetOut.writeRaw(middlePeerIdWanted,ID_SIZE);	

				} else if(flagType == 0x01) {

					packetOut.writeRaw(content.current(),68);content.next(68);
					
					Entities<Group>::Iterator it;
					for(it = _invoker.groups.begin();it!=_invoker.groups.end();++it) {

						Group& group = *it->second;						
			
						Group::Iterator itP;
						for(itP=group.begin();itP!=group.end();++itP) {
							if((**itP)==_target.id) {
								UInt8 result1[AES_KEY_SIZE];
								UInt8 result2[AES_KEY_SIZE];
								HMAC(EVP_sha256(),_target.sharedSecret,KEY_SIZE,&_target.initiatorNonce[0],_target.initiatorNonce.size(),result1,NULL);
								HMAC(EVP_sha256(),group.id,ID_SIZE,result1,AES_KEY_SIZE,result2,NULL);
								packetOut.writeRaw(result2,AES_KEY_SIZE);content.next(AES_KEY_SIZE);
//.........这里部分代码省略.........