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restructuring lib and add prepared bytes to parse into callback

/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: mqttapi.h,v 1.1.2.6 2012/05/05 13:10:24 misho Exp $
*
**************************************************************************
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Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
	by Michael Pounov <misho@elwix.org>.  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. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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*/
#ifndef __MQTTAPI_H
#define __MQTTAPI_H


#include "aitmqtt.h"


#ifdef API_SERVER_SIDE
/* MQTT server structure & hooks */

/* MQTT command callback. 1st argument is (mqtt_srv_t*) server handle, 2nd is ready length */
typedef int (*mqtt_cb_t)(void* /*mqtt_srv_t**/, int, void *);
typedef struct {
	mqtt_cb_t	cmds[MQTT_TYPE_MAX];

	int		sock;
	mqtt_msg_t	*buf;
} mqtt_srv_t;
#define mqtt_srv_setCmd(x, _cmd, _func)	(assert((x)), (x)->cmds[(_cmd)] = (_func))
#define mqtt_srv_getCmd(x, _cmd)	(assert((x)), (x)->cmds[(_cmd)])


/*
 * mqtt_srv_Init() Init server side actor
 *
 * @sock = Client socket from accept()
 * @buf = Message buffer
 * return: NULL error or !=NULL allocated server handle
 */
mqtt_srv_t *mqtt_srv_Init(int sock, mqtt_msg_t * __restrict buf);
/*
 * mqtt_srv_Fini() Finish MQTT server side support
 *
 * @psrv = Server handle
 * return: none
 */
void mqtt_srv_Fini(mqtt_srv_t ** __restrict psrv);
/*
 * mqtt_srv_Dispatch() MQTT server dispatcher
 *
 * @srv = Server handle
 * @arg = Argument pass to command callback
 * @rlen = Ready bytes to parse
 * return: -1 error or 0 ok
 */
int mqtt_srv_Dispatch(mqtt_srv_t * __restrict srv, void *arg, int rlen);
#endif

/*
 * mqtt_KeepAlive() - Keep Alive check routine
 *
 * @sock = connected socket
 * @ka = keep alive timeout
 * @tries = tries for receive correct ping response, usually ==1
 * return: -1 error, 0 host is alive, 1 timeout session or 2 broken session
 */
int mqtt_KeepAlive(int sock, unsigned short ka, unsigned char tries);


#ifdef API_CLIENT_SIDE
/* MQTT client structure */

typedef struct {
	int		sock;
	mqtt_msg_t	*buf;
} mqtt_cli_t;


/*
 * mqtt_cli_Open() - Open client connection to MQTT broker
 *
 * @addr = brokers address
 * return: NULL error or !=NULL connected to broker
 */
mqtt_cli_t *mqtt_cli_Open(struct sockaddr *addr);
/*
 * mqtt_cli_Close() - Close client connection
 *
 * @cli = connected client
 * return: -1 error or 0 disconnected client and freed all resources
 */
int mqtt_cli_Close(mqtt_cli_t ** __restrict cli);
#endif


#endif