Network: Add support for sending/receiving NetPacket over UDP/TCP

Former-commit-id: 5c09a5fa8b499e4204d2312f6d04d8554093a5a4

src/Nazara/Network/TcpClient.cpp

@@ -6,7 +6,7 @@
 #include <Nazara/Core/CallOnExit.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <limits>
-#include <Nazara/Network/Debug.hpp>
+#include <Nazara/Network/NetPacket.hpp>
 
 #if defined(NAZARA_PLATFORM_WINDOWS)
 #include <Nazara/Network/Win32/SocketImpl.hpp>
@@ -16,6 +16,8 @@
 #error Missing implementation: Socket
 #endif
 
+#include <Nazara/Network/Debug.hpp>
+
 namespace Nz
 {
 	SocketState TcpClient::Connect(const IpAddress& remoteAddress)
@@ -141,6 +143,66 @@ namespace Nz
 		return true;
 	}
 
+	bool TcpClient::ReceivePacket(NetPacket* packet)
+	{
+		//TODO: Every packet requires at least two Receive call, using an internal buffer of a fixed size would prevent this
+		NazaraAssert(packet, "Invalid packet");
+
+		if (!m_pendingPacket.headerReceived)
+		{
+			m_pendingPacket.data.Resize(NetPacket::HeaderSize);
+
+			std::size_t received;
+			if (!Receive(&m_pendingPacket.data[m_pendingPacket.received], NetPacket::HeaderSize - m_pendingPacket.received, &received))
+				return false;
+
+			m_pendingPacket.received += received;
+
+			NazaraAssert(m_pendingPacket.received <= NetPacket::HeaderSize, "Received more data than header size");
+			if (m_pendingPacket.received >= NetPacket::HeaderSize)
+			{
+				UInt16 size;
+				if (!NetPacket::DecodeHeader(m_pendingPacket.data.GetConstBuffer(), &size, &m_pendingPacket.netcode))
+				{
+					m_lastError = SocketError_Packet;
+					NazaraWarning("Invalid header data");
+					return false;
+				}
+
+				m_pendingPacket.data.Resize(size - NetPacket::HeaderSize);
+				m_pendingPacket.headerReceived = true;
+				m_pendingPacket.received = 0;
+			}
+		}
+
+		// We may have just received the header now
+		if (m_pendingPacket.headerReceived)
+		{
+			UInt16 packetSize = static_cast<UInt16>(m_pendingPacket.data.GetSize()); //< Total packet size
+
+			std::size_t received;
+			if (!Receive(&m_pendingPacket.data[m_pendingPacket.received], packetSize - m_pendingPacket.received, &received))
+				return false;
+
+			m_pendingPacket.received += received;
+
+			NazaraAssert(m_pendingPacket.received <= packetSize, "Received more data than packet size");
+			if (m_pendingPacket.received >= packetSize)
+			{
+				// Okay we received the whole packet, copy it
+				packet->Reset(m_pendingPacket.netcode, m_pendingPacket.data.GetConstBuffer(), m_pendingPacket.data.GetSize());
+
+				// And reset every state
+				m_pendingPacket.data.Clear();
+				m_pendingPacket.headerReceived = false;
+				m_pendingPacket.received = 0;
+				return true;
+			}
+		}
+
+		return false;
+	}
+
 	bool TcpClient::Send(const void* buffer, std::size_t size, std::size_t* sent)
 	{
 		NazaraAssert(m_handle != SocketImpl::InvalidHandle, "Invalid handle");
@@ -183,6 +245,20 @@ namespace Nz
 		return true;
 	}
 
+	bool TcpClient::SendPacket(const NetPacket& packet)
+	{
+		std::size_t size = 0;
+		const UInt8* ptr = static_cast<const UInt8*>(packet.OnSend(&size));
+		if (!ptr)
+		{
+			m_lastError = SocketError_Packet;
+			NazaraError("Failed to prepare packet");
+			return false;
+		}
+
+		return Send(ptr, size, nullptr);
+	}
+
 	bool TcpClient::SetCursorPos(UInt64 offset)
 	{
 		NazaraError("SetCursorPos() cannot be used on sequential streams");
@@ -215,7 +291,7 @@ namespace Nz
 				}
 
 				SocketState newState = SocketImpl::Connect(m_handle, m_peerAddress, msTimeout, &m_lastError);
-				NazaraAssert(newState != SocketState_Connecting, "Invalid internal return");
+				NazaraAssert(newState != SocketState_Connecting, "Invalid internal return"); //< Connect cannot return Connecting is a timeout was specified
 
 				// Prevent valid peer address in non-connected state
 				if (newState == SocketState_NotConnected)

src/Nazara/Network/UdpSocket.cpp

@@ -3,6 +3,7 @@
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
 #include <Nazara/Network/UdpSocket.hpp>
+#include <Nazara/Network/NetPacket.hpp>
 
 #if defined(NAZARA_PLATFORM_WINDOWS)
 #include <Nazara/Network/Win32/SocketImpl.hpp>
@@ -61,6 +62,43 @@ namespace Nz
 		return true;
 	}
 
+	bool UdpSocket::ReceivePacket(NetPacket* packet, IpAddress* from)
+	{
+		// I'm not sure what's the best between having a 65k bytes buffer ready for any datagram size
+		// or querying the next datagram size every time, for now I'll leave it as is
+		packet->Reset(NetCode_Invalid, std::numeric_limits<UInt16>::max());
+
+		std::size_t received;
+		if (!Receive(packet->GetData(), static_cast<std::size_t>(packet->GetSize()), from, &received))
+		{
+			NazaraError("Failed to receive packet");
+			return false;
+		}
+
+		if (received == 0)
+			return false; //< No datagram received
+
+		Nz::UInt16 netCode;
+		Nz::UInt16 packetSize;
+		if (!NetPacket::DecodeHeader(packet->GetConstData(), &packetSize, &netCode))
+		{
+			m_lastError = SocketError_Packet;
+			NazaraWarning("Invalid header data");
+			return false;
+		}
+
+		if (packetSize != received)
+		{
+			m_lastError = SocketError_Packet;
+			NazaraWarning("Invalid packet size (packet size is " + String::Number(packetSize) + " bytes, received " + Nz::String::Number(received) + " bytes)");
+			return false;
+		}
+
+		packet->Resize(received);
+		packet->SetNetCode(netCode);
+		return true;
+	}
+
 	bool UdpSocket::Send(const IpAddress& to, const void* buffer, std::size_t size, std::size_t* sent)
 	{
 		NazaraAssert(to.IsValid(), "Invalid ip address");
@@ -77,6 +115,20 @@ namespace Nz
 		return true;
 	}
 
+	bool UdpSocket::SendPacket(const IpAddress& to, const NetPacket& packet)
+	{
+		std::size_t size = 0;
+		const UInt8* ptr = static_cast<const UInt8*>(packet.OnSend(&size));
+		if (!ptr)
+		{
+			m_lastError = SocketError_Packet;
+			NazaraError("Failed to prepare packet");
+			return false;
+		}
+
+		return Send(to, ptr, size, nullptr);
+	}
+
 	void UdpSocket::OnClose()
 	{
 		AbstractSocket::OnClose();