opportunistic-xbee/packet.h

#ifndef _PACKET_H_
	#define _PACKET_H_

	#include "protocol.h"
	#include <Wire.h>

	#define PKTREAD_OK                      0
	#define PKTREAD_EMPTY                   1
	#define PKTREAD_OVERFLOW                2
	#define PKTREAD_INVALID_DISCOVER_FORMAT 3
	#define PKTREAD_INVALID_MESSAGE_FORMAT  4

	class Packet {
		private:
			// 1. common
			uint8_t opcode; // 0 = discover ; 1 = message

			// 2. wrappers
			struct discover dsc;
			struct message  msg;

			// 3. helpers
			uint8_t read_discover(uint8_t*  buf, const size_t size);
			uint8_t read_message(uint8_t*   buf, const size_t size);
			size_t  write_discover(uint8_t* buf);
			size_t  write_message(uint8_t*  buf);

		public:

			Packet();
			// builds a packet from raw data and returns the status code
			uint8_t read(uint8_t* buf, const size_t size);

			// writes the binary representation of the packet returns the size
			size_t write(uint8_t* buf);

			// GETTERS / SETTERS
			uint8_t getOpcode();
			void setOpcode(uint8_t value);

			uint8_t getSender();
			void setSender(uint8_t value);

			uint8_t getWave();
			void setWave(uint8_t value);

			uint8_t getDist();
			void setDist(uint8_t value);

			uint8_t getTTL();
			void setTTL(uint8_t value);

			uint8_t getSize();

			uint8_t* getData();
			void setData(uint8_t *buffer);

		protected:
			resizeMessage(){
				msg.data = realloc(msg.data, (msg.size+1) * sizeof(uint8_t));
				// memset(msg.data, 0, msg.size+1);
			}

	};

#endif