SIP Stack (1 of 3)

#include "SIPParserInclude\CSIPMaxForwardsParser.h"

namespace SIPParserFW
{
	CSIPMaxForwardsParser::CSIPMaxForwardsParser()
	{
		ReleaseCSIPMaxForwardsParserData() ;
	}

	CSIPMaxForwardsParser::CSIPMaxForwardsParser( const CSIPMaxForwardsParser &SIPMaxForwardsParser )
		: ASIPParser( SIPMaxForwardsParser )
	{
		ReleaseCSIPMaxForwardsParserData() ;

		CopyCSIPMaxForwardsParserData( SIPMaxForwardsParser ) ;
	}

	CSIPMaxForwardsParser::~CSIPMaxForwardsParser()
	{
		ReleaseCSIPMaxForwardsParserData() ;
	}

	CSIPMaxForwardsParser& CSIPMaxForwardsParser::operator=( const CSIPMaxForwardsParser &SIPMaxForwardsParser )
	{
		ReleaseCSIPMaxForwardsParserData() ;

		ASIPParser::operator=( SIPMaxForwardsParser ) ;

		CopyCSIPMaxForwardsParserData( SIPMaxForwardsParser ) ;

		return *this ;
	}

	void CSIPMaxForwardsParser::ReleaseCSIPMaxForwardsParserData()
	{
		m_strMaxForwards.erase() ;
	}

	void CSIPMaxForwardsParser::CopyCSIPMaxForwardsParserData( const CSIPMaxForwardsParser &SIPMaxForwardsParser )
	{
		m_strMaxForwards = SIPMaxForwardsParser.m_strMaxForwards ;
	}

	CSIPMaxForwardsParser* CSIPMaxForwardsParser::GetAvailable()
	{
		CSIPMaxForwardsParser *pSIPMaxForwardsParser = CPoolObject<CSIPMaxForwardsParser>::GetAvailable() ;
		return pSIPMaxForwardsParser ;
	}

	void CSIPMaxForwardsParser::Release()
	{
		ReleaseParameters() ;

		CPoolObject<CSIPMaxForwardsParser>::Release( this ) ;
	}

	void CSIPMaxForwardsParser::ReleaseParameters()
	{
		ReleaseCSIPMaxForwardsParserData() ;
		
		ASIPParser::ReleaseParameters() ;
	}

	ASIPParser* CSIPMaxForwardsParser::Copy()
	{
		CSIPMaxForwardsParser *pSIPMaxForwardsParser = CSIPMaxForwardsParser::GetAvailable() ;
		if( pSIPMaxForwardsParser == NULL )
			return NULL ;

		*pSIPMaxForwardsParser = *this ;

		return pSIPMaxForwardsParser ;
	}

	// Grammer
	//Max-Forwards = "Max-Forwards" HCOLON 1*DIGIT

	// Please see RFC3261, Pages 173
	// Please see RFC3261, Pages from 219 to 232 for ABNF forms
	// Please see file ..\Document\SIPMaxForwards Parsing Logic.txt for parsing algorithm

	// Page 173:
		//The Max-Forwards header field must be used with any SIP method to
		//limit the number of proxies or gateways that can forward the request
		//to the next downstream server. This can also be useful when the
		//client is attempting to trace a request chain that appears to be
		//failing or looping in mid-chain.
		//The Max-Forwards value is an integer in the range 0-255 indicating
		//the remaining number of times this request message is allowed to be
		//forwarded. This count is decremented by each server that forwards
		//the request. The recommended initial value is 70.
		//This header field should be inserted by elements that can not
		//otherwise guarantee loop detection. For example, a B2BUA should
		//insert a Max-Forwards header field.

	FW_RETURN_TYPE CSIPMaxForwardsParser::Parse( const std::string &strStringToParse )
	{
		if( strStringToParse.empty() )
			return SIP_PARSE_ERR_EMPTY_STRING_TO_PARSE ;

		m_strMaxForwards = strStringToParse ;
		
		return SIP_ERR_SUCCESS ;
	}

	std::string CSIPMaxForwardsParser::ToString() const
	{
		std::string strSIPMaxForwardsString = "" ;

		if( !m_strMaxForwards.empty() )
			strSIPMaxForwardsString = m_strMaxForwards ;

		return strSIPMaxForwardsString ;
	}

	std::string CSIPMaxForwardsParser::GetHeaderName() const
	{
		return GetRuntimeHeaderName( SIP_HEADER_MAX_FORWARDS ) ;
	}
	
} // End namespace