Refactored various message-related operations into the Message class.

- Replaces the XPCMessage struct.
 - Messages are now read from a UDPSocket by the Message class.
 - Printing messages to the log is now handled by the Message class.
 - In the future, may extend this class with command-specific subclasses that encapsulate additional message parsing functionality.

xpcPlugin/Message.h

@@ -0,0 +1,57 @@
+//Copyright (c) 2013-2015 United States Government as represented by the Administrator of the
+//National Aeronautics and Space Administration. All Rights Reserved.
+#ifndef XPC_MESSAGE_H
+#define XPC_MESSAGE_H
+
+#include "UDPSocket.h"
+
+namespace XPC
+{
+	/// Represents a message received from an XPC client.
+	///
+	/// \author Jason Watkins
+	/// \version 1.0
+	/// \since 1.0
+	/// \date Intial Version: 2015-04-11
+	/// \date Last Updated: 2015-04-11
+	class Message
+	{
+	public:
+		/// Reads a datagram from the specified socket and interprets it as a
+		/// message.
+		///
+		/// \param sock The socket to read from.
+		/// \returns    A message parsed from the data read from sock. If no
+		///             data was read or an error occurs, returns a message
+		///             with the size set to 0.
+		static Message ReadFrom(UDPSocket& sock);
+
+		/// Gets the message header in binary form.
+		std::uint32_t GetMagicNumber();
+
+		/// Gets the message header.
+		std::string GetHead();
+
+		/// Gets the buffer underlying the message.
+		const std::uint8_t* GetBuffer();
+
+		/// Gets the size of the message in bytes.
+		std::size_t GetSize();
+
+		/// Gets the address this message was read from.
+		struct sockaddr GetSource();
+
+		/// Prints the contents of the message to the XPC log.
+		void PrintToLog();
+
+	private:
+		Message();
+
+		static const std::size_t bufferSize = 4096;
+		std::uint8_t buffer[bufferSize];
+		std::size_t size;
+		struct sockaddr source;
+	};
+}
+
+#endif