/** Message related functions
 *
 * @file
 * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
 * @copyright 2014-2016, Institute for Automation of Complex Power Systems, EONERC
 *   This file is part of VILLASnode. All Rights Reserved. Proprietary and confidential.
 *   Unauthorized copying of this file, via any medium is strictly prohibited. 
 *********************************************************************************/

#ifndef _MSG_H_
#define _MSG_H_

#include <stdio.h>

#include "msg_format.h"

struct node;

/** Swaps message contents byte-order.
 *
 * Message can either be transmitted in little or big endian
 * format. The actual endianess for a message is defined by the
 * msg::endian field. This covers msg::length, msg::sequence, msg::data and msg::ts fields.
 * Received message are usally converted to the endianess of the host.
 * This is required for further sanity checks of the sequence number
 * or parsing of the data.
 *
 * @param m A pointer to the message
 */
void msg_swap(struct msg *m);

/** Check the consistency of a message.
 *
 * The functions checks the header fields of a message.
 *
 * @param m A pointer to the message
 * @retval 0 The message header is valid.
 * @retval <0 The message header is invalid.
 */
int msg_verify(struct msg *m);

#endif /* _MSG_H_ */