SIP Stack (1 of 3)

#include "SIPParserInclude\CSIPEncodingParser.h"

namespace SIPParserFW
{
	CSIPEncodingParser::CSIPEncodingParser()
		:	m_pSIPEncodingParameters( NULL )
	{
		ReleaseCSIPEncodingParserData() ;
	}

	CSIPEncodingParser::CSIPEncodingParser( const CSIPEncodingParser &SIPEncodingParser )
		: ASIPParser( SIPEncodingParser ), m_pSIPEncodingParameters( NULL )
	{
		ReleaseCSIPEncodingParserData() ;

		CopyCSIPEncodingParserData( SIPEncodingParser ) ;
	}

	CSIPEncodingParser::~CSIPEncodingParser()
	{
		ReleaseCSIPEncodingParserData() ;
	}

	CSIPEncodingParser& CSIPEncodingParser::operator=( const CSIPEncodingParser &SIPEncodingParser )
	{
		ReleaseCSIPEncodingParserData() ;

		ASIPParser::operator=( SIPEncodingParser ) ;

		CopyCSIPEncodingParserData( SIPEncodingParser ) ;

		return *this ;
	}

	void CSIPEncodingParser::ReleaseCSIPEncodingParserData()
	{
		m_strCoding.erase() ;

		if( m_pSIPEncodingParameters != NULL )
		{
			m_pSIPEncodingParameters->Release() ;
			m_pSIPEncodingParameters = NULL ;
		}
	}

	void CSIPEncodingParser::CopyCSIPEncodingParserData( const CSIPEncodingParser &SIPEncodingParser )
	{
		m_strCoding = SIPEncodingParser.m_strCoding ;

		m_pSIPEncodingParameters = ( ( SIPEncodingParser.m_pSIPEncodingParameters != NULL ) 
								? dynamic_cast< CSIPParamListParser* > 
								( SIPEncodingParser.m_pSIPEncodingParameters->Copy() ) : NULL ) ;
	}

	CSIPEncodingParser* CSIPEncodingParser::GetAvailable()
	{
		CSIPEncodingParser *pSIPEncodingParser = CPoolObject<CSIPEncodingParser>::GetAvailable() ;
		return pSIPEncodingParser ;
	}

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

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

	void CSIPEncodingParser::ReleaseParameters()
	{
		ReleaseCSIPEncodingParserData() ;
		
		ASIPParser::ReleaseParameters() ;
	}

	ASIPParser* CSIPEncodingParser::Copy()
	{
		CSIPEncodingParser *pSIPEncodingParser = CSIPEncodingParser::GetAvailable() ;
		if( pSIPEncodingParser == NULL )
			return NULL ;

		*pSIPEncodingParser = *this ;

		return pSIPEncodingParser ;
	}

	// Grammer
	//encoding = codings *(SEMI accept-param)
	//codings = content-coding / "*"
	//content-coding = token
	//accept-param = ("q" EQUAL qvalue) / generic-param
	//qvalue = ( "0" [ "." 0*3DIGIT ] )	/ ( "1" [ "." 0*3("0") ] )
	//generic-param = token [ EQUAL gen-value ]
	//gen-value = token / host / quoted-string

	// Please see RFC3261, Pages from 163 to 164
	// Please see RFC3261, Pages from 219 to 232 for ABNF forms
	// Please see file ..\Document\SIPEncoding Parsing Logic.txt for parsing algorithm
	
	FW_RETURN_TYPE CSIPEncodingParser::Parse( const std::string &strStringToParse )
	{
		if( strStringToParse.empty() )
			return SIP_PARSE_ERR_EMPTY_STRING_TO_PARSE ;

		std::string::size_type iEncodingParamsPosition = strStringToParse.find( ";" ) ;

		FW_RETURN_TYPE FWRetValue = SIP_ERR_SUCCESS ;

		if( iEncodingParamsPosition == std::string::npos )
		{
			m_strCoding = strStringToParse ;
		}
		else
		{
			m_strCoding = strStringToParse.substr( 0, iEncodingParamsPosition ) ;
			std::string strEncodingParameters = "" ;
			strEncodingParameters = strStringToParse.substr( iEncodingParamsPosition + 1 ) ;
			CSIPParamListParser *pSIPEncodingParameters = NULL ;
			if( ( FWRetValue = QuerySIPEncodingParameters( &pSIPEncodingParameters ) ) != SIP_ERR_SUCCESS )
				return FWRetValue ;
			
			FWRetValue = pSIPEncodingParameters->Parse( strEncodingParameters, ";", "=" ) ;
		}

		return FWRetValue ;
	}

	FW_RETURN_TYPE CSIPEncodingParser::QuerySIPEncodingParameters( CSIPParamListParser **pSIPEncodingParameters )
	{
		*pSIPEncodingParameters = NULL ;

		if( m_pSIPEncodingParameters == NULL )
		{
			m_pSIPEncodingParameters = CSIPParamListParser::GetAvailable() ;

			if( m_pSIPEncodingParameters == NULL )
				return SIP_PARSE_ERR_SIP_PARAM_LIST_PARSER_OBJECT_NOT_CREATED ;
		}

		*pSIPEncodingParameters = m_pSIPEncodingParameters ;

		return SIP_ERR_SUCCESS ;
	}

	std::string CSIPEncodingParser::ToString() const
	{
		std::string strSIPEncodingString = "" ;

		if( !m_strCoding.empty() )
			strSIPEncodingString = m_strCoding ;

		if( m_pSIPEncodingParameters != NULL )
		{
			if( m_pSIPEncodingParameters->GetParamListSize() > 0 )
				strSIPEncodingString = strSIPEncodingString + ";" + m_pSIPEncodingParameters->ToString() ;
		}

		return strSIPEncodingString ;
	}
	
} // End namespace