packet.h

/*
* Copyright 2011 Anders Ma (andersma.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the copyright holder may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL WILLIAM TISÄTER BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#ifndef PACKET_H_
#define PACKET_H_

typedef enum _PACKET_TYPE {
	PTYPE_RFID_CMD = 'A',
	PTYPE_RFID_ID,
} PACKET_TYPE;

#define MAX_PACKET_DATA_LENGTH 20

struct packet_struct;
typedef struct packet_struct packet_t;

struct packet_struct {
	PACKET_TYPE type;
	union {
		unsigned char rfid_cmd[5];
		unsigned char rfid_id[5];
	} raw;
	unsigned char data[MAX_PACKET_DATA_LENGTH];
	unsigned int data_length;
};

extern int packet_encode(packet_t *p);
extern int packet_decode(packet_t *p);

#endif