parser/parse_hname2.c
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 /* 
  * $Id$ 
  *
  * Fast 32-bit Header Field Name Parser
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  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser 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
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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  *
  * History:
  * --------
18dbc018
  * 2003-02-28 scratchpad compatibility abandoned (jiri)
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  * 2003-01-27 next baby-step to removing ZT - PRESERVE_ZT (jiri)
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  * 2003-05-01 added support for Accept HF (janakj)
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  */
 
 
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 #include "../comp_defs.h"
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 #include "parse_hname2.h"
 #include "keys.h"
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 #include "../ut.h"  /* q_memchr */
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 #define LOWER_BYTE(b) ((b) | 0x20)
 #define LOWER_DWORD(d) ((d) | 0x20202020)
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 /*
  * Skip all whitechars and return position of the first
  * non-white char
  */
 static inline char* skip_ws(char* p, unsigned int size)
 {
 	char* end;
 	
 	end = p + size;
 	for(; p < end; p++) {
 		if ((*p != ' ') && (*p != '\t')) return p;
 	}
 	return p;
 }
 	
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 /*
  * Parser macros
  */
 #include "case_via.h"      /* Via */
 #include "case_from.h"     /* From */
 #include "case_to.h"       /* To */
 #include "case_cseq.h"     /* CSeq */
 #include "case_call.h"     /* Call-ID */
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 #include "case_cont.h"     /* Contact, Content-Type, Content-Length, Content-Purpose, 
 			    * Content-Action, Content-Disposition */
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 #include "case_rout.h"     /* Route */
 #include "case_max.h"      /* Max-Forwards */
 #include "case_reco.h"     /* Record-Route */
 #include "case_auth.h"     /* Authorization */
 #include "case_expi.h"     /* Expires */
 #include "case_prox.h"     /* Proxy-Authorization, Proxy-Require */
 #include "case_allo.h"     /* Allow */
 #include "case_unsu.h"     /* Unsupported */
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 #include "case_even.h"     /* Event */
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 #include "case_acce.h"     /* Accept, Accept-Language */
 #include "case_orga.h"     /* Organization */
 #include "case_prio.h"     /* Priority */
 #include "case_subj.h"     /* Subject */
 #include "case_user.h"     /* User-Agent */
 #include "case_supp.h"     /* Supported */
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 #define READ(val) \
 (*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))
 
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 #define FIRST_QUATERNIONS       \
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         case _via1_: via1_CASE; \
 	case _from_: from_CASE; \
 	case _to12_: to12_CASE; \
 	case _cseq_: cseq_CASE; \
 	case _call_: call_CASE; \
 	case _cont_: cont_CASE; \
 	case _rout_: rout_CASE; \
 	case _max__: max_CASE;  \
 	case _reco_: reco_CASE; \
 	case _via2_: via2_CASE; \
 	case _auth_: auth_CASE; \
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 	case _supp_: supp_CASE; \
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 	case _expi_: expi_CASE; \
 	case _prox_: prox_CASE; \
 	case _allo_: allo_CASE; \
 	case _unsu_: unsu_CASE; \
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         case _even_: even_CASE; \
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         case _acce_: acce_CASE; \
         case _orga_: orga_CASE; \
         case _prio_: prio_CASE; \
         case _subj_: subj_CASE; \
         case _user_: user_CASE;
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 #define PARSE_COMPACT(id)          \
         switch(*(p + 1)) {         \
         case ' ':                  \
 	        hdr->type = id;    \
 	        p += 2;            \
 	        goto dc_end;       \
 	                           \
         case ':':                  \
 	        hdr->type = id;    \
 	        hdr->name.len = 1; \
 	        return (p + 2);    \
         }                            
 
 
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 char* parse_hname2(char* begin, char* end, struct hdr_field* hdr)
 {
 	register char* p;
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 	register unsigned int val;
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 	if ((end - begin) < 4) {
 		hdr->type = HDR_ERROR;
 		return begin;
 	}
 
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 	p = begin;
 
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 	val = LOWER_DWORD(READ(p));
 	hdr->name.s = begin;
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 	switch(val) {
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 	FIRST_QUATERNIONS;
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 	default:
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 		switch(LOWER_BYTE(*p)) {
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 		case 't':                           
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 			switch(LOWER_BYTE(*(p + 1))) {          
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 			case 'o':                   
 			case ' ':                   
 				hdr->type = HDR_TO; 
 				p += 2;             
 				goto dc_end;        
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 			case ':':                   
 				hdr->type = HDR_TO; 
 				hdr->name.len = 1;  
 				return (p + 2);     
 			}                           
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 			break;
 
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 		case 'v': PARSE_COMPACT(HDR_VIA);           break;
 		case 'f': PARSE_COMPACT(HDR_FROM);          break;
 		case 'i': PARSE_COMPACT(HDR_CALLID);        break;
 		case 'm': PARSE_COMPACT(HDR_CONTACT);       break;
 		case 'l': PARSE_COMPACT(HDR_CONTENTLENGTH); break;
 		case 'k': PARSE_COMPACT(HDR_SUPPORTED);     break;
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 		case 'c': PARSE_COMPACT(HDR_CONTENTTYPE);   break;
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 		case 'o': PARSE_COMPACT(HDR_EVENT);         break;
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 		}
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 		goto other;
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         }
 
 	     /* Double colon hasn't been found yet */
  dc_end:
        	p = skip_ws(p, end - p);
 	if (*p != ':') {   
 	        goto other;
 	} else {
 		hdr->name.len = p - hdr->name.s;
 		return (p + 1);
 	}
 
 	     /* Unknown header type */
  other:    
 	p = q_memchr(p, ':', end - p);
 	if (!p) {        /* No double colon found, error.. */
 		hdr->type = HDR_ERROR;
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 		hdr->name.s = 0;
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 		hdr->name.len = 0;
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 		return 0;
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 	} else {
 		hdr->type = HDR_OTHER;
 		hdr->name.len = p - hdr->name.s;
 		return (p + 1);
 	}
 }