SIP Stack (1 of 3)

#include "SIPParserInclude\CSIPCSeqParser.h"

namespace SIPParserFW
{
	CSIPCSeqParser::CSIPCSeqParser()
	{
		ReleaseCSIPCSeqParserData() ;
	}

	CSIPCSeqParser::CSIPCSeqParser( const CSIPCSeqParser &SIPCSeqParser )
		: ASIPParser( SIPCSeqParser )
	{
		ReleaseCSIPCSeqParserData() ;

		CopyCSIPCSeqParserData( SIPCSeqParser ) ;
	}

	CSIPCSeqParser::~CSIPCSeqParser()
	{
		ReleaseCSIPCSeqParserData() ;
	}

	CSIPCSeqParser& CSIPCSeqParser::operator=( const CSIPCSeqParser &SIPCSeqParser )
	{
		ReleaseCSIPCSeqParserData() ;

		ASIPParser::operator=( SIPCSeqParser ) ;

		CopyCSIPCSeqParserData( SIPCSeqParser ) ;

		return *this ;
	}

	void CSIPCSeqParser::ReleaseCSIPCSeqParserData()
	{
		m_strNumber.erase() ;

		m_strMethod.erase() ;
	}

	void CSIPCSeqParser::CopyCSIPCSeqParserData( const CSIPCSeqParser &SIPCSeqParser )
	{
		m_strNumber = SIPCSeqParser.m_strNumber ;
		m_strMethod = SIPCSeqParser.m_strMethod ;
	}

	CSIPCSeqParser* CSIPCSeqParser::GetAvailable()
	{
		CSIPCSeqParser *pSIPCSeqParser = CPoolObject<CSIPCSeqParser>::GetAvailable() ;
		return pSIPCSeqParser ;
	}

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

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

	void CSIPCSeqParser::ReleaseParameters()
	{
		ReleaseCSIPCSeqParserData() ;
		
		ASIPParser::ReleaseParameters() ;
	}

	ASIPParser* CSIPCSeqParser::Copy()
	{
		CSIPCSeqParser *pSIPCSeqParser = CSIPCSeqParser::GetAvailable() ;
		if( pSIPCSeqParser == NULL )
			return NULL ;

		*pSIPCSeqParser = *this ;

		return pSIPCSeqParser ;
	}

	// Grammer
	//CSeq = "CSeq" HCOLON 1*DIGIT LWS Method
	//Method = INVITEm / ACKm / OPTIONSm / BYEm / CANCELm / REGISTERm / extension-method
	//extension-method = token

	// Please see RFC3261, Pages 170
	// Please see RFC3261, Pages from 219 to 232 for ABNF forms
	// Please see file ..\Document\SIPCSeq Parsing Logic.txt for parsing algorithm

	// Page 170:
		//A CSeq header field in a request contains a single decimal sequence
		//number and the request method. The sequence number MUST be
		//expressible as a 32-bit unsigned integer. The method part of CSeq is
		//case-sensitive. The CSeq header field serves to order transactions
		//within a dialog, to provide a means to uniquely identify
		//transactions, and to differentiate between new requests and request
		//retransmissions. Two CSeq header fields are considered equal if the
		//sequence number and the request method are identical.

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

		std::string::size_type iSIPMethodPosition = strStringToParse.find( SIP_CONST_SPACE ) ;

		if(	iSIPMethodPosition == std::string::npos )
			return SIP_PARSE_ERR_INVALID_SIP_CSEQ ;

		m_strNumber = strStringToParse.substr( 0, iSIPMethodPosition ) ;
		m_strMethod = strStringToParse.substr( iSIPMethodPosition + strlen( SIP_CONST_SPACE ) ) ;
		
		return SIP_ERR_SUCCESS ;
	}

	std::string CSIPCSeqParser::ToString() const
	{
		std::string strSIPCSeqString = "" ;

		if( !m_strNumber.empty() )
			strSIPCSeqString = m_strNumber ;

		if( !m_strMethod.empty() )
			strSIPCSeqString = strSIPCSeqString + SIP_CONST_SPACE + m_strMethod ;

		return strSIPCSeqString ;
	}

	std::string CSIPCSeqParser::GetHeaderName() const
	{
		return GetRuntimeHeaderName( SIP_HEADER_CSEQ ) ;
	}
	
} // End namespace