Move PackedMessage to ripple_data

modules/ripple_data/protocol/ripple_PackedMessage.h

@@ -0,0 +1,55 @@
+//
+// packaging of messages into length/type-prepended buffers
+// ready for transmission.
+
+#ifndef RIPPLE_PACKEDMESSAGE_H
+#define RIPPLE_PACKEDMESSAGE_H
+
+// PackedMessage implements simple "packing" of protocol buffers Messages into
+// a string prepended by a header specifying the message length.
+// MessageType should be a Message class generated by the protobuf compiler.
+//
+
+class PackedMessage : public boost::enable_shared_from_this <PackedMessage>
+{
+public:
+    typedef boost::shared_ptr< ::google::protobuf::Message > MessagePointer;
+	typedef boost::shared_ptr<PackedMessage> pointer;
+
+public:
+    /** Number of bytes in a message header.
+    */
+    static unsigned const kHeaderBytes = 6;
+
+    PackedMessage (::google::protobuf::Message const& message, int type);
+
+    /** Retrieve the packed message data.
+    */
+    // VFALCO: TODO, shouldn't this be const?
+	std::vector <uint8_t>& getBuffer()
+    {
+        return mBuffer;
+    }
+
+    /** Determine bytewise equality.
+    */
+	bool operator == (PackedMessage const& other) const;
+
+    /** Calculate the length of a packed message.
+    */
+	static unsigned getLength (std::vector <uint8_t> const& buf);
+	
+    /** Determine the type of a packed message.
+    */
+    static int getType (std::vector <uint8_t> const& buf);
+
+private:
+	// Encodes the size and type into a header at the beginning of buf
+	//
+	void encodeHeader (unsigned size, int type);
+
+    std::vector <uint8_t> mBuffer;
+};
+
+#endif /* PACKEDMESSAGE_H */
+