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478 lines
9.9 KiB
478 lines
9.9 KiB
/*
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* $Id: parse_header.cpp 1119 2008-10-16 08:54:04Z rco $
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*
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* Copyright (C) 2007 Raphael Coeffic
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*
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* This file is part of SEMS, a free SIP media server.
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*
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* SEMS is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version. This program is released under
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* the GPL with the additional exemption that compiling, linking,
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* and/or using OpenSSL is allowed.
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*
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* For a license to use the SEMS software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* SEMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "parse_header.h"
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#include "parse_common.h"
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#include "defs.h"
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#include "log.h"
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#include <memory>
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using std::unique_ptr;
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//
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// Header length
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//
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#define COMPACT_len 1
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#define TO_len SIP_HDR_LEN(SIP_HDR_TO) // 2
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#define VIA_len SIP_HDR_LEN(SIP_HDR_VIA) // 3
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#define FROM_len SIP_HDR_LEN(SIP_HDR_FROM) // 4
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#define CSEQ_len SIP_HDR_LEN(SIP_HDR_CSEQ) // 4
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#define RSEQ_len SIP_HDR_LEN(SIP_HDR_RSEQ) // 4
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#define RACK_len SIP_HDR_LEN(SIP_HDR_RACK) // 4
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#define ROUTE_len SIP_HDR_LEN(SIP_HDR_ROUTE) // 5
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#define CALL_ID_len SIP_HDR_LEN(SIP_HDR_CALL_ID) // 7
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#define CONTACT_len SIP_HDR_LEN(SIP_HDR_CONTACT) // 7
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#define REQUIRE_len SIP_HDR_LEN(SIP_HDR_REQUIRE) // 7
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#define CONTENT_TYPE_len SIP_HDR_LEN(SIP_HDR_CONTENT_TYPE) // 12
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#define RECORD_ROUTE_len SIP_HDR_LEN(SIP_HDR_RECORD_ROUTE) // 12
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#define CONTENT_LENGTH_len SIP_HDR_LEN(SIP_HDR_CONTENT_LENGTH) // 14
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#define MAX_FORWARDS_len SIP_HDR_LEN(SIP_HDR_MAX_FORWARDS) // 12
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sip_header::sip_header()
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: type(H_UNPARSED),
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name(),value(),
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p(NULL)
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{}
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sip_header::sip_header(const sip_header& hdr)
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: type(hdr.type),
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name(hdr.name),
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value(hdr.value),
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p(NULL)
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{
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}
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sip_header::sip_header(int type, const cstring& name, const cstring& value)
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: type(type),
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name(name),
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value(value),
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p(NULL)
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{
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}
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sip_header::~sip_header()
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{
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delete p;
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}
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int parse_header_type(sip_header* h)
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{
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h->type = sip_header::H_UNPARSED;
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switch(h->name.len){
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case COMPACT_len:{
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switch (LOWER_B(h->name.s[0])) {
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case 'i': { // Call-ID
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h->type = sip_header::H_CALL_ID;
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} break;
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case 'm': { // Contact
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h->type = sip_header::H_CONTACT;
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} break;
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// case 'e': // Content-Encoding
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// {} break;
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case 'l': { // Content-Length
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h->type = sip_header::H_CONTENT_LENGTH;
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} break;
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case 'c': { // Content-Type
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h->type = sip_header::H_CONTENT_TYPE;
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} break;
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case 'f': { // From
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h->type = sip_header::H_FROM;
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} break;
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// case 's': // Subject
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// {} break;
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// case 'k': // Supported
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// {} break;
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case 't': { // To
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h->type = sip_header::H_TO;
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} break;
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case 'v': {// Via
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h->type = sip_header::H_VIA;
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} break;
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default:
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h->type = sip_header::H_OTHER;
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} break;
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} break;
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case TO_len:
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if(!lower_cmp(h->name.s,SIP_HDR_TO,TO_len)){
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h->type = sip_header::H_TO;
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}
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break;
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case VIA_len:
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if(!lower_cmp(h->name.s,SIP_HDR_VIA,VIA_len)){
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h->type = sip_header::H_VIA;
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}
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break;
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//case FROM_len:
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//case RSEQ_len:
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//case RACK_len:
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case CSEQ_len:
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switch(h->name.s[0]){
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case 'f':
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case 'F':
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if(!lower_cmp(h->name.s+1,SIP_HDR_FROM+1,FROM_len-1)){
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h->type = sip_header::H_FROM;
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}
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break;
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case 'c':
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case 'C':
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if(!lower_cmp(h->name.s+1,SIP_HDR_CSEQ+1,CSEQ_len-1)){
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h->type = sip_header::H_CSEQ;
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}
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break;
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case 'r':
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case 'R':
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switch(h->name.s[1]) {
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case 's':
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case 'S':
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if(!lower_cmp(h->name.s+2, SIP_HDR_RSEQ+2,
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SIP_HDR_LEN(SIP_HDR_RSEQ)-2))
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h->type = sip_header::H_RSEQ;
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break;
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case 'a':
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case 'A':
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if(!lower_cmp(h->name.s+2, SIP_HDR_RACK+2,
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SIP_HDR_LEN(SIP_HDR_RACK)-2)) {
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h->type = sip_header::H_RACK;
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}
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break;
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}
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break;
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}
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break;
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case ROUTE_len:
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if(!lower_cmp(h->name.s+1,SIP_HDR_ROUTE+1,ROUTE_len-1)){
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h->type = sip_header::H_ROUTE;
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}
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break;
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//case CALL_ID_len:
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//case REQUIRE_len:
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case CONTACT_len:
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switch(h->name.s[0]){
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case 'c':
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case 'C':
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switch(h->name.s[1]){
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case 'a':
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case 'A':
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if(!lower_cmp(h->name.s+2,SIP_HDR_CALL_ID+2,CALL_ID_len-2)){
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h->type = sip_header::H_CALL_ID;
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}
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break;
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case 'o':
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case 'O':
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if(!lower_cmp(h->name.s+2,SIP_HDR_CONTACT+2,CONTACT_len-2)){
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h->type = sip_header::H_CONTACT;
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}
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break;
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default:
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h->type = sip_header::H_OTHER;
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break;
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}
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break;
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case 'r':
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case 'R':
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if (! lower_cmp(h->name.s+1, SIP_HDR_REQUIRE+1,
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SIP_HDR_LEN(SIP_HDR_REQUIRE)-1))
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h->type = sip_header::H_REQUIRE;
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break;
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default:
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h->type = sip_header::H_OTHER;
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break;
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}
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break;
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//case RECORD_ROUTE_len:
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case CONTENT_TYPE_len:
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//case MAX_FORWARDS_len:
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switch(h->name.s[0]){
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case 'c':
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case 'C':
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if(!lower_cmp(h->name.s,SIP_HDR_CONTENT_TYPE,CONTENT_TYPE_len)){
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h->type = sip_header::H_CONTENT_TYPE;
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}
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break;
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case 'r':
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case 'R':
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if(!lower_cmp(h->name.s,SIP_HDR_RECORD_ROUTE,RECORD_ROUTE_len)){
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h->type = sip_header::H_RECORD_ROUTE;
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}
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break;
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case 'm':
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case 'M':
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if(!lower_cmp(h->name.s,SIP_HDR_MAX_FORWARDS,MAX_FORWARDS_len)){
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h->type = sip_header::H_MAX_FORWARDS;
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}
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break;
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}
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break;
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case CONTENT_LENGTH_len:
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if(!lower_cmp(h->name.s,SIP_HDR_CONTENT_LENGTH,CONTENT_LENGTH_len)){
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h->type = sip_header::H_CONTENT_LENGTH;
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}
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break;
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}
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if(h->type == sip_header::H_UNPARSED)
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h->type = sip_header::H_OTHER;
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return h->type;
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}
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void add_parsed_header(list<sip_header*>& hdrs, sip_header* hdr)
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{
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parse_header_type(hdr);
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hdrs.push_back(hdr);
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}
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int parse_headers(list<sip_header*>& hdrs, char** c, char* end)
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{
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//
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// Header states
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//
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enum {
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H_NAME=0,
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H_HCOLON,
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H_VALUE_SWS,
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H_VALUE,
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};
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int st = H_NAME;
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int saved_st = 0;
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char* begin = *c;
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if(!(*c) || (*c == end)) {
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return 0;
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}
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unique_ptr<sip_header> hdr(new sip_header());
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for(;(*c < end) && **c;(*c)++){
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switch(st){
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case H_NAME:
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switch(**c){
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case_CR_LF;
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case HCOLON:
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st = H_VALUE_SWS;
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hdr->name.set(begin,*c-begin);
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break;
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case SP:
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case HTAB:
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st = H_HCOLON;
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hdr->name.set(begin,*c-begin);
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break;
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}
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break;
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case H_VALUE_SWS:
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switch(**c){
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case_CR_LF;
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case SP:
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case HTAB:
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break;
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default:
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st = H_VALUE;
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begin = *c;
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break;
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};
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break;
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case H_VALUE:
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switch(**c){
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case_CR_LF;
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};
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break;
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case H_HCOLON:
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switch(**c){
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case HCOLON:
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st = H_VALUE_SWS;
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break;
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case SP:
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case HTAB:
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break;
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default:
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DBG("Missing ':' after header name\n");
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return MALFORMED_SIP_MSG;
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}
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break;
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case_ST_CR(**c);
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case ST_LF:
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case ST_CRLF:
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switch(saved_st){
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case H_NAME:
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if((*c-(st==ST_CRLF?2:1))-begin == 0){
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//DBG("Detected end of headers\n");
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return 0;
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}
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DBG("Illegal CR or LF in header name\n");
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return MALFORMED_SIP_MSG;
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case H_VALUE_SWS:
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if(!IS_WSP(**c)){
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DBG("Malformed header: <%.*s>\n",(int)(*c-begin),begin);
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begin = *c;
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saved_st = H_NAME;
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//re-parse cur char w. new state
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(*c)--;
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}
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break;
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case H_VALUE:
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if(!IS_WSP(**c)){
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hdr->value.set(begin,(*c-(st==ST_CRLF?2:1))-begin);
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//DBG("hdr: \"%.*s: %.*s\"\n",
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// hdr->name.len,hdr->name.s,
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// hdr->value.len,hdr->value.s);
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add_parsed_header(hdrs,hdr.release());
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hdr.reset(new sip_header());
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begin = *c;
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saved_st = H_NAME;
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//re-parse cur char w. new state
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(*c)--;
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}
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break;
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default:
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DBG("Oooops! st=%i\n",saved_st);
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break;
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}
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st = saved_st;
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break;
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}
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}
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switch(st){
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case H_NAME:
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DBG("Incomplete header (st=%i;saved_st=%i)\n",st,saved_st);
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if(st == H_NAME){
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DBG("header = \"%.*s\"\n",(int)(*c - begin), begin);
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}
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return UNEXPECTED_EOT;
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case H_VALUE:
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if(*c - begin > 0){
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hdr->value.set(begin,*c - begin);
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//DBG("hdr: \"%.*s: %.*s\"\n",
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// hdr->name.len,hdr->name.s,
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// hdr->value.len,hdr->value.s);
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add_parsed_header(hdrs,hdr.release());
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return 0;
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}
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break;
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case ST_LF:
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case ST_CRLF:
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switch(saved_st){
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case H_NAME:
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if((*c-(st==ST_CRLF?2:1))-begin == 0){
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//DBG("Detected end of headers\n");
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return 0;
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}
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DBG("Illegal CR or LF in header name\n");
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return MALFORMED_SIP_MSG;
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case H_VALUE:
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if(*c - begin > 2){
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hdr->value.set(begin,*c - begin - (st==ST_CRLF? 2 : 1));
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//DBG("hdr: \"%.*s: %.*s\"\n",
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// hdr->name.len,hdr->name.s,
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// hdr->value.len,hdr->value.s);
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add_parsed_header(hdrs,hdr.release());
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return 0;
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}
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break;
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}
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break;
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}
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DBG("Incomplete header (st=%i;saved_st=%i)\n",st,saved_st);
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return UNEXPECTED_EOT;
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}
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void free_headers(list<sip_header*>& hdrs)
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{
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while(!hdrs.empty()) {
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delete hdrs.front();
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hdrs.pop_front();
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}
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}
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/** EMACS **
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* Local variables:
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* mode: c++
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* c-basic-offset: 4
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* End:
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*/
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