/*
 * Generic Parameter Parser
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of opensips, a free SIP server.
 *
 * opensips is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * opensips is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * History:
 * -------
 * 2003年03月24日 Created by janakj
 * 2003年04月07日 shm duplication support (janakj)
 * 2003年04月07日 URI class added (janakj)
 */

#ifndef PARSE_PARAM_H
#define PARSE_PARAM_H

#include <stdio.h>
#include "../str.h"


/*
 * Supported types of parameters
 */
typedef enum ptype {
	P_OTHER = 0, /* Unknown parameter */
	P_Q, /* Contact: q parameter */
	P_EXPIRES, /* Contact: expires parameter */
	P_METHODS, /* Contact: methods parameter (RFC 3840) */
	P_RECEIVED, /* Contact: received parameter */
	P_INSTANCE, /* Contact: sip.instance parameter */
	P_TRANSPORT, /* URI: transport parameter */
	P_LR, /* URI: lr parameter */
	P_R2, /* URI: r2 parameter (ser specific) */
	P_MADDR, /* URI: maddr parameter */
	P_TTL, /* URI: ttl parameter */
	P_DSTIP, /* URI: dstip parameter */
	P_DSTPORT, /* URi: dstport parameter */
} ptype_t;


/*
 * Class of parameters
 */
typedef enum pclass {
	CLASS_ANY = 0, /* Any parameters, well-known hooks will be not used */
	CLASS_CONTACT, /* Contact parameters */
	CLASS_URI /* URI parameters */
} pclass_t;


/*
 * Structure representing a parameter
 */
typedef struct param {
	ptype_t type; /* Type of the parameter */
	str name; /* Parameter name */
	str body; /* Parameter body */
	int len; /* Total length of the parameter including = and quotes */
	struct param* next; /* Next parameter in the list */
} param_t;


/*
 * Hooks to well known parameters for contact class of parameters
 */
struct contact_hooks {
	struct param* last_param;/* last param - MUST be first field */
	struct param* expires; /* expires parameter */
	struct param* q; /* q parameter */
	struct param* methods; /* methods parameter (RFC 3840) */
	struct param* received; /* received parameter */
	struct param* instance; /* instance parameter */
};


/*
 * Hooks to well known parameter for URI class of parameters
 */
struct uri_hooks {
	struct param* last_param;/* last param - MUST be first field */
	struct param* transport; /* transport parameter */
	struct param* lr; /* lr parameter */
	struct param* r2; /* r2 parameter */
	struct param* maddr; /* maddr parameter */
	struct param* ttl; /* ttl parameter */
	struct param* dstip; /* Destination IP */
	struct param* dstport; /* Destination port */
};


/*
 * Union of hooks structures for all classes
 */
typedef union param_hooks {
	struct contact_hooks contact; /* Contact hooks */
	struct uri_hooks uri; /* URI hooks */
	struct param* last_param; /* last param */
} param_hooks_t;


/*
 * Parse parameters
 * _s is string containing parameters
 * _c is class of parameters
 * _h is pointer to structure that will be filled with pointer to well known parameters
 * linked list of parsed parameters will be stored in
 * the variable _p is pointing to
 * The function returns 0 on success and negative number
 * on an error
 */
int parse_params(str* _s, pclass_t _c, param_hooks_t* _h, param_t** _p);


/*
 * Free linked list of parameters
 */
void free_params(param_t* _p);


/*
 * Free linked list of parameters from shared memory
 */
void shm_free_params(param_t* _p);


/*
 * Print linked list of parameters, just for debugging
 */
void print_params(param_t* _p);


/*
 * Duplicate linked list of parameters
 */
int duplicate_params(param_t** _n, param_t* _p);


/*
 * Duplicate linked list of parameters
 */
int shm_duplicate_params(param_t** _n, param_t* _p);


#endif /* PARSE_PARAM_H */