refactor io

include/sp/io/IOInterfaceImpl.inl

@@ -1 +1,73 @@
 #pragma once
+
+#include <stdexcept>
+
+namespace sp {
+namespace io {
+
+template <typename IOTag, typename MessageDispatcher, typename MessageFactory>
+void Stream<IOTag, MessageDispatcher, MessageFactory>::SendMessage(const MessageBase& a_Message) {
+	// TODO: process compress + encryption
+	DataBuffer data = a_Message.Write();
+	DataBuffer dataSize;
+	m_Interface.Write(dataSize << sp::VarInt{data.GetSize()} << data);
+}
+
+template <typename IOTag, typename MessageDispatcher, typename MessageFactory>
+void Stream<IOTag, MessageDispatcher, MessageFactory>::RecieveMessages() {
+	// TODO: process compress + encryption
+	while (true) {
+
+		// reading the first VarInt part byte by byte
+		std::uint64_t lenghtValue = 0;
+		unsigned int readPos = 0;
+
+		while (true) {
+			static constexpr int SEGMENT_BITS = (1 << 7) - 1;
+			static constexpr int CONTINUE_BIT = 1 << 7;
+
+			DataBuffer buffer = m_Interface.Read(sizeof(std::uint8_t));
+
+			// eof
+			if (buffer.GetSize() == 0)
+				return;
+
+			std::uint8_t part;
+			buffer >> part;
+			lenghtValue |= static_cast<std::uint64_t>(part & SEGMENT_BITS) << readPos;
+
+			if ((part & CONTINUE_BIT) == 0)
+				break;
+
+			readPos += 7;
+
+			if (readPos >= 8 * sizeof(lenghtValue))
+				throw std::runtime_error("VarInt is too big");
+		}
+
+		// nothing to read
+		if (lenghtValue == 0)
+			return;
+
+		DataBuffer buffer;
+		buffer = m_Interface.Read(lenghtValue);
+
+		// TODO: process compress + encryption
+
+		MsgIdType packetType;
+		buffer >> packetType;
+
+		static const MessageFactory messageFactory;
+
+		std::unique_ptr<MessageBase> message = messageFactory.CreateMessage(packetType);
+
+		assert(message != nullptr);
+
+		message->Read(buffer);
+
+		GetDispatcher().Dispatch(*message);
+	}
+}
+
+}  // namespace io
+}  // namespace sp