C++ PacketWriter::write8方法代码示例

void RTMFP::Encode(RTMFPEngine& aesEncrypt,PacketWriter& packet) {
	// paddingBytesLength=(0xffffffff-plainRequestLength+5)&0x0F
	int paddingBytesLength = (0xFFFFFFFF-packet.size()+5)&0x0F;
	// Padd the plain request with paddingBytesLength of value 0xff at the end
	while (paddingBytesLength-->0)
		packet.write8(0xFF);
	WriteCRC(packet);
	// Encrypt the resulted request
	aesEncrypt.process(packet.data()+4,(UInt8*)packet.data()+4,packet.size()-4);
}

void Handshake::createCookie(PacketWriter& writer,HelloAttempt& attempt,const string& tag,const string& queryUrl) {
	// New Cookie
	Cookie* pCookie = attempt.pCookie;
	if(!pCookie) {
		if(attempt.pTarget)
			pCookie = new Cookie(*this,invoker,tag,*attempt.pTarget);
		else
			pCookie = new Cookie(*this,invoker,tag,queryUrl);
		_cookies[pCookie->value()] =  pCookie;
		attempt.pCookie = pCookie;
	}
	writer.write8(COOKIE_SIZE);
	writer.writeRaw(pCookie->value(),COOKIE_SIZE);
}

void FlowWriter::flush(PacketWriter& writer,UInt64 stage,UInt8 flags,bool header,BinaryReader& reader,UInt16 size) {
	if(_stageAck==0 && header)
		flags |= MESSAGE_HEADER;
	if(size==0)
		flags |= MESSAGE_ABANDONMENT;
	if(_closed && _messages.size()==1) // On LAST message
		flags |= MESSAGE_END;

	// TRACE("FlowWriter %u stage %u",id,stage);

	writer.write8(flags);

	if(header) {
		writer.write7BitLongValue(id);
		writer.write7BitLongValue(stage);
		writer.write7BitLongValue(stage-_stageAck);

		// signature
		if(_stageAck==0) {
			writer.writeString8(signature);
			// No write this in the case where it's a new flow!
			if(flowId>0) {
				writer.write8(1+Util::Get7BitValueSize(flowId)); // following size
				writer.write8(0x0a); // Unknown!
				writer.write7BitLongValue(flowId);
			}
			writer.write8(0); // marker of end for this part
		}

	}

	if(size>0) {
		reader.readRaw(writer.begin()+writer.position(),size);
		writer.next(size);
	}
}

// TODO make perhaps a FlowHandshake
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);

			// UDP hole punching

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

			if(type == 0x0a){
				/// Handshake
	
				// RESPONSE 38

				// New Cookie
				char cookie[65];
				RandomInputStream ris;
				ris.read(cookie,64);
				cookie[64]='\0';
				response.write8(64);
				response.writeRaw(cookie,64);
				_cookies[cookie] = new Cookie(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 0x38: {
			_farId = request.read32();
			string cookie;
			request.readRaw(request.read8(),cookie);

			map<string,Cookie*>::iterator itCookie = _cookies.find(cookie.c_str());
			if(itCookie==_cookies.end()) {
				ERROR("Handshake cookie '%s' unknown",cookie.c_str());
				return 0;
			}

			request.read8(); // why 0x81?

			// signature
			string farSignature;
			request.readString8(farSignature); // 81 02 1D 02 stable

			// farPubKeyPart
			UInt8 farPubKeyPart[128];
			request.readRaw((char*)farPubKeyPart,sizeof(farPubKeyPart));

			string farCertificat;
			request.readString8(farCertificat);
			
			// peerId = SHA256(farSignature+farPubKey)
			string temp(farSignature);
			temp.append((char*)farPubKeyPart,sizeof(farPubKeyPart));
			EVP_Digest(temp.c_str(),temp.size(),(UInt8*)peer().id,NULL,EVP_sha256(),NULL);
			
			// Compute Diffie-Hellman secret
			UInt8 pubKey[128];
			UInt8 sharedSecret[128];
			RTMFP::EndDiffieHellman(RTMFP::BeginDiffieHellman(pubKey),farPubKeyPart,sharedSecret);

			// Compute Keys
			UInt8 requestKey[AES_KEY_SIZE];
			UInt8 responseKey[AES_KEY_SIZE];
			RTMFP::ComputeAsymetricKeys(sharedSecret,pubKey,_signature,farCertificat,requestKey,responseKey);

			// RESPONSE
			Util::UnpackUrl(itCookie->second->queryUrl,(string&)peer().path,(map<string,string>&)peer().parameters);
			response << _gateway.createSession(_farId,peer(),requestKey,responseKey);
			response.write8(0x81);
			response.writeString8(_signature);
			response.writeRaw((char*)pubKey,sizeof(pubKey));
			response.write8(0x58);

			// remove cookie
			_cookies.erase(itCookie);

			// db_add_public(s); // TODO

			return 0x78;
//.........这里部分代码省略.........