/*

  * Copyright (C) 2006 Andreas Granig <agranig@linguin.org>
  * 

  * This file is part of Kamailio, a free SIP server.
  *
  * Kamailio 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
  *
  * Kamailio 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

  *
  */
 
 #ifndef OPTION_TAGS_H
 #define OPTION_TAGS_H
 
 #include <strings.h>

 #include "hf.h"
 #include "keys.h"

 
 #define F_OPTION_TAG_PATH	(1 << 0)
 #define F_OPTION_TAG_100REL	(1 << 1)
 #define F_OPTION_TAG_TIMER	(1 << 2)
 #define F_OPTION_TAG_EVENTLIST	(1 << 3)
 #define F_OPTION_TAG_GRUU	(1 << 4)
 #define F_OPTION_TAG_OUTBOUND	(1 << 5)
 
 #define OPTION_TAG_PATH_STR		"path"
 #define OPTION_TAG_PATH_LEN		(sizeof(OPTION_TAG_PATH_STR)-1)
 
 /* RFC 3262 (PRACK) */
 #define OPTION_TAG_100REL_STR		"100rel"
 #define OPTION_TAG_100REL_LEN		(sizeof(OPTION_TAG_100REL_STR)-1)
 
 /* RFC 4028 */
 #define OPTION_TAG_TIMER_STR		"timer"
 #define OPTION_TAG_TIMER_LEN		(sizeof(OPTION_TAG_TIMER_STR)-1)
 
 /* RFC 4662 (RLS) */
 #define OPTION_TAG_EVENTLIST_STR	"eventlist"
 #define OPTION_TAG_EVENTLIST_LEN	(sizeof(OPTION_TAG_EVENTLIST_STR)-1)
 
 /* RFC 5627 */
 #define OPTION_TAG_GRUU_STR		"gruu"
 #define OPTION_TAG_GRUU_LEN		(sizeof(OPTION_TAG_GRUU_STR)-1)
 
 /* RFC 5626 */
 #define OPTION_TAG_OUTBOUND_STR		"outbound"
 #define OPTION_TAG_OUTBOUND_LEN		(sizeof(OPTION_TAG_OUTBOUND_STR)-1)
 
 
 struct option_tag_body {
 	hf_parsed_free_f hfree;        /* function to free the content */
 	unsigned int option_tags;      /* option-tag mask for the current hdr */
 	unsigned int option_tags_all;  /* option-tag mask for the all hdr
 	                                *  - it's set only for the first hdr in 
 	                                *  sibling list*/
 };
 
 
 #define IS_DELIM(c) (*(c) == ' ' || *(c) == '\t' || *(c) == '\r' || *(c) == '\n' || *(c) == ',')
 
 /* from parser/parse_hname2.c: */
 #define LOWER_BYTE(b) ((b) | 0x20)
 #define LOWER_DWORD(d) ((d) | 0x20202020)
 #define READ(val) \
 	(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))
 
 /*!
  * Parse HF body containing option-tags.
  */
 static inline int parse_option_tag_body(str *body, unsigned int *tags)
 {
 	register char* p;
 	register unsigned int val;
 	int len, pos = 0;

 	int case_found;

 
 	*tags = 0;
 
 	p = body->s;
 	len = body->len;
 
 	while (pos < len) {
 		/* skip spaces and commas */
 		for (; pos < len && IS_DELIM(p); ++pos, ++p);
 
 		val = LOWER_DWORD(READ(p));

 		case_found = 0;

 		switch (val) {
 
 			/* "path" */
 			case _path_:
 				if(pos + 4 <= len && IS_DELIM(p+4)) {
 					*tags |= F_OPTION_TAG_PATH;
 					pos += 5; p += 5;

 					case_found = 1;

 				}
 				break;
 
 			/* "100rel" */
 			case _100r_:
 				if ( pos+6 <= len
 					 && LOWER_BYTE(*(p+4))=='e' && LOWER_BYTE(*(p+5))=='l'
 					 && IS_DELIM(p+6)) {
 					*tags |= F_OPTION_TAG_100REL;
 					pos += OPTION_TAG_100REL_LEN + 1;
 					p   += OPTION_TAG_100REL_LEN + 1;

 					case_found = 1;

 				}
 				break;
 
 			/* "timer" */
 			case _time_:
 				if ( pos+5 <= len && LOWER_BYTE(*(p+4))=='r'
 					 && IS_DELIM(p+5) ) {
 					*tags |= F_OPTION_TAG_TIMER;
 					pos += OPTION_TAG_TIMER_LEN + 1;
 					p   += OPTION_TAG_TIMER_LEN + 1;

 					case_found = 1;

 				}
 				break;

 		}
 		if(case_found==0) {

 			/* extra require or unknown */

 			if(pos+OPTION_TAG_EVENTLIST_LEN<=len
 					&& strncasecmp(p, OPTION_TAG_EVENTLIST_STR,
 						OPTION_TAG_EVENTLIST_LEN)==0
 					&& IS_DELIM(p+OPTION_TAG_EVENTLIST_LEN) ) {
 				*tags |= F_OPTION_TAG_EVENTLIST;
 				pos += OPTION_TAG_EVENTLIST_LEN + 1;
 				p   += OPTION_TAG_EVENTLIST_LEN + 1;
 			} else if(pos+OPTION_TAG_GRUU_LEN<=len
 					&& strncasecmp(p, OPTION_TAG_GRUU_STR,
 						OPTION_TAG_GRUU_LEN)==0
 					&& IS_DELIM(p+OPTION_TAG_GRUU_LEN)) {
 				*tags |= F_OPTION_TAG_GRUU;
 				pos += OPTION_TAG_GRUU_LEN + 1;
 				p   += OPTION_TAG_GRUU_LEN + 1;
 			} else if(pos+OPTION_TAG_OUTBOUND_LEN<=len
 					&& strncasecmp(p, OPTION_TAG_OUTBOUND_STR,
 						OPTION_TAG_OUTBOUND_LEN)==0
 					&& IS_DELIM(p+OPTION_TAG_OUTBOUND_LEN)) {
 				*tags |= F_OPTION_TAG_OUTBOUND;
 				pos += OPTION_TAG_OUTBOUND_LEN + 1;
 				p   += OPTION_TAG_OUTBOUND_LEN + 1;
 			} else {
 				/* unknown (not needed) - skip element */
 				for (; pos < len && !IS_DELIM(p); ++pos, ++p);
 			}

 		}
 	}
 	
 	return 0;
 }
 
 
 void hf_free_option_tag(void *parsed);
 
 #endif /* OPTION_TAGS_H */