realtimenetprots/sipfw/SDP/src/SdpCodecParseUtil.cpp
author Petteri Saari <petteri.saari@digia.com>
Thu, 25 Nov 2010 13:59:42 +0200
branchMSRP_FrameWork
changeset 58 cdb720e67852
parent 0 307788aac0a8
permissions -rw-r--r--
This release addresses the following issues: 1. The crash bug fix when receiving file 2. Now the sending is based on MSRP messages, there is no longer file receiving or sending. Client sends data as MSRP was designed. 3. Soma MSRP stack was created so that the client told the correct session-id, Symbian stack generated it by itself. This is not allowed, it was changed so that clients tell the session-id (same as used in SIP INVITE). 4. Unnecessary division of data to chunks removed when there is no need to interrupt sending. The message is sent in as few chunks as possible. 5. Stack can now receive files and chunks with ?unlimited? size. Old stack wrote the incoming data to memory and did not utilize disk space until the end of chunk was reached (large chunks from another client crashed it). 6. Now when writing the incoming data to file, it will take into account the byte-range header values. So, this complies with the RFC4975 requirements that stack must be able to handle chunks that come in any sequence. 7. Some buffering changes to outgoing/incoming data. 8. The outgoing data is now checked that it does not contain the created transaction-id before sending the data. 9. MSRP success reports are now implemented and tested against servers. 10. Progress report system fixed so progress is now visible on client (all the way to 100%). 11. Message Cancel receiving / Cancel sending now corrected and made to work as rfc4975 requires. (termination from sender and error code from receiver when cancelling). 12. Bug correction related to messages received not belonging to any session, old stack implementation did send error response, but after response was written it did give the buffer to client anyway. Now corrected.

// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of "Eclipse Public License v1.0"
// which accompanies this distribution, and is available
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
//
// Initial Contributors:
// Nokia Corporation - initial contribution.
//
// Contributors:
//
// Description:
// Name          : SdpCodecParseUtil.cpp
// Part of       : SDP Codec
// Version       : 1.0
//



#include "SdpCodecParseUtil.h"
#include "sdpcodecstringconstants.h"
#include "_sdpdefs.h"
#include <s32strm.h>
#include "SdpUtil.h"
#include "SdpTimeField.h"
#include "SdpBandwidthField.h"
#include "SdpAttributeField.h"
#include "SdpMediaField.h"
#include "SdpConnectionField.h"
#include "SdpKeyField.h"
#include "SdpOriginField.h"
#include "SdpRepeatField.h"
#include "SdpCodecErr.h"
#include "SdpCodecConstants.h"
#include "uri8.h"
#include "uriutilscommon.h"
#include "badesca.h"

// ----------------------------------------------------------------------------
// CSdpCodecParseUtil::NewL
// ----------------------------------------------------------------------------
//
CSdpCodecParseUtil* 
CSdpCodecParseUtil::NewL(RStringPool aPool, const TDesC8& aValue,TInt aErrCode)
	{
	CSdpCodecParseUtil* obj = CSdpCodecParseUtil::NewLC(aPool, aValue,aErrCode);
	CleanupStack::Pop();//obj
	return obj;
	}

// ----------------------------------------------------------------------------
// CSdpCodecParseUtil::NewLC
// ----------------------------------------------------------------------------
//
CSdpCodecParseUtil* 
CSdpCodecParseUtil::NewLC(RStringPool aPool, const TDesC8& aValue,TInt aErrCode)
	{
	CSdpCodecParseUtil* obj = new(ELeave)CSdpCodecParseUtil;
	CleanupStack::PushL(obj);
	obj->ConstructL(aPool, aValue,aErrCode);
	return obj;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::FieldLineValueL
// ---------------------------------------------------------------------------
//
TPtrC8 CSdpCodecParseUtil::FieldLineValueL(const TDesC8& aValue)
	{
	__ASSERT_ALWAYS (aValue.Length() > 0, User::Leave(KErrArgument));
	TPtrC8 lineStartBuf(aValue.Mid(2));
	TInt lineEndPosition = lineStartBuf.Locate('\r');
	if(lineEndPosition == KErrNotFound)
		{
		lineEndPosition = lineStartBuf.Locate('\n');
		}
	return lineStartBuf.Left(lineEndPosition);
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::CheckFieldNameL
// ---------------------------------------------------------------------------
//
RArray<TPtrC8> CSdpCodecParseUtil::CheckFieldNameL(RStringPool aPool,
												  TInt aIndex, 
												  const TDesC8& aValue,
												  TInt aErrCode)
	{
	if(!aValue.Length())
			{
			User::Leave(KErrArgument);
			}
	RArray<TPtrC8> elementArray = SdpUtil::GetElementsFromLineL(aValue, 
																aErrCode);
	CleanupClosePushL(elementArray);
	RStringF name = aPool.OpenFStringL(elementArray[0]);
	CleanupClosePushL(name);
	if(name!=(aPool.StringF(aIndex, SdpCodecStringConstants::Table)))
		{
		User::Leave(KErrArgument);//parsererror
		}
	CleanupStack::Pop(2);//name, elementArray
	name.Close();
	return elementArray;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::CheckOptionalFieldNameL
// ---------------------------------------------------------------------------
//
RArray<TPtrC8> CSdpCodecParseUtil::CheckOptionalFieldNameL(RStringPool aPool, 
												 TInt aIndex, 
												 const TDesC8& aValue,
												  TInt aErrCode)
	{
	RArray<TPtrC8> elementArray;
	elementArray.Reset();
	if(aValue.Length())
		{
		elementArray = SdpUtil::GetElementsFromLineL(aValue, aErrCode);
	    CleanupClosePushL(elementArray);
		RStringF name = aPool.OpenFStringL(elementArray[0]);
		CleanupClosePushL(name);
		if(name!=(aPool.StringF(aIndex, SdpCodecStringConstants::Table)))
			{
			elementArray.Reset();
			}
		CleanupStack::Pop(2);//name, elementArray
		name.Close();
		}
	return elementArray;
	}

// ----------------------------------------------------------------------------
// CSdpCodecParseUtil::CSdpCodecParseUtil
// ----------------------------------------------------------------------------
//
CSdpCodecParseUtil::CSdpCodecParseUtil()
	{

	}

// ----------------------------------------------------------------------------
// CSdpCodecParseUtil::~CSdpCodecParseUtil
// ----------------------------------------------------------------------------
//
CSdpCodecParseUtil::~CSdpCodecParseUtil()
	{
	iLineArray.Reset();
	iElementArray.Reset();
	if(iTimeFields)
		{
		iTimeFields->ResetAndDestroy();
		delete iTimeFields;
		}
	
	if(iBandwidthFields)
		{
		iBandwidthFields->ResetAndDestroy();
		delete iBandwidthFields;
		}
	
	if(iAttributeFields)
		{
		iAttributeFields->ResetAndDestroy();
		delete iAttributeFields;
		}
	
	if(iMediaFields)
		{
		iMediaFields->ResetAndDestroy();
		delete iMediaFields;
		}

	if(iConnectionFields)
		{
		iConnectionFields->ResetAndDestroy();
		delete iConnectionFields;
		}

	if(iEmailFields)
		{
		iEmailFields->Reset();
		delete iEmailFields;
		}

	if(iPhoneFields)
		{
		iPhoneFields->Reset();
		delete iPhoneFields;
		}
	delete iToken;
	}

// ----------------------------------------------------------------------------
// CSdpCodecParseUtil::ConstructL
// ----------------------------------------------------------------------------
//
void CSdpCodecParseUtil::ConstructL(RStringPool aPool, const TDesC8& aValue,
									TInt aErrCode)
	{
	iPool = aPool;
	iData.Set(aValue);
	iToken = KNullDesC8().AllocL();
	iEmailFields = new(ELeave)CDesC8ArraySeg(1);
	iPhoneFields = new(ELeave)CDesC8ArraySeg(1);
	iBandwidthFields = new(ELeave)RPointerArray<CSdpBandwidthField>;
	iTimeFields = new(ELeave)RPointerArray<CSdpTimeField>;
	iAttributeFields = new(ELeave)RPointerArray<CSdpAttributeField>;
	iMediaFields = new(ELeave)RPointerArray<CSdpMediaField>;
	iConnectionFields = new(ELeave)RPointerArray<CSdpConnectionField>;
	iLineArray = SdpUtil::DivideToLinesL(aValue,aErrCode);
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseSessionVersionL
// ---------------------------------------------------------------------------
//
TUint CSdpCodecParseUtil::ParseSessionVersionL(TInt aErrCode)
	{
	TUint sdpVersion = 0;
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckFieldNameL(iPool,
											SdpCodecStringConstants::EVersion,
											iLineArray[0],aErrCode);
		if(iElementArray.Count() > 1)
			{
			TLex8 lex(iElementArray[1]);
			if(lex.Val(sdpVersion) == KErrNone)
				{
				iLineArray.Remove(0);
				iElementArray.Reset();
				}
			else
				{
				User::Leave(KErrSdpCodecVersionField);
				}
			}
		}
	else
		{
		User::Leave(KErrSdpCodecVersionField);
		}
	return sdpVersion;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseSessionOwnerL
// ---------------------------------------------------------------------------
//
CSdpOriginField* CSdpCodecParseUtil::ParseSessionOwnerL(TInt aErrCode)
	{
	CSdpOriginField* sdpOriginField = NULL;
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckFieldNameL(iPool,
											SdpCodecStringConstants::EOrigin,
											iLineArray[0],aErrCode);
		sdpOriginField = 
					CSdpOriginField::DecodeL(iLineArray[0]);
		iElementArray.Reset();
		iLineArray.Remove(0);
		}
	else
		{
		User::Leave(KErrSdpCodecOriginField);
		}
	return sdpOriginField;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseSessionNameL
// ---------------------------------------------------------------------------
//
const TDesC8& CSdpCodecParseUtil::ParseSessionNameL(TInt aErrCode)
	{
	delete iToken;
	iToken = 0;
	iToken = KNullDesC8().AllocL();
	if(iLineArray.Count())
		{
		if(iLineArray[0].Length() < 6 && 
			(iLineArray[0].CompareF(_L8("s= \r\n")) == 0 ||
			iLineArray[0].CompareF(_L8("s= \n")) == 0 ))
			{
			iLineArray.Remove(0);
			delete iToken;
			iToken = 0;
			iToken = _L8(" ").AllocL();
			return	*iToken;
			}
		iElementArray = CSdpCodecParseUtil::CheckFieldNameL(iPool,
											SdpCodecStringConstants::ESession,
											iLineArray[0],aErrCode);
		__ASSERT_ALWAYS (iElementArray.Count() > 1, 
		User::Leave(KErrSdpCodecSessionField));
		delete iToken;
		iToken = 0;
		iToken = (CSdpCodecParseUtil::FieldLineValueL(iLineArray[0])).AllocL();
		iElementArray.Reset();
		iLineArray.Remove(0);
		}
	else
		{
		User::Leave(KErrSdpCodecSessionField);
		}
	return *iToken;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseInformationL
// ---------------------------------------------------------------------------
//
const TDesC8& CSdpCodecParseUtil::ParseInformationL(TInt aErrCode)
	{
	delete iToken;
	iToken = 0;
	iToken = KNullDesC8().AllocL();
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
												SdpCodecStringConstants::EInfo,
												iLineArray[0],aErrCode);

		if(iElementArray.Count())
			{
			__ASSERT_ALWAYS (iElementArray.Count() > 1, 
			User::Leave(KErrSdpCodecInfoField));
			delete iToken;
			iToken = 0;
			iToken = 
				(CSdpCodecParseUtil::FieldLineValueL(iLineArray[0])).AllocL();
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		}
	return *iToken;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseUriL
// ---------------------------------------------------------------------------
//
CUri8* CSdpCodecParseUtil::ParseUriL(TInt aErrCode)
	{
	CUri8* uri = 0;
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
												SdpCodecStringConstants::EUri,
												iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{
			__ASSERT_ALWAYS (iElementArray.Count() == 2, 
				User::Leave(KErrSdpCodecUriField));
			TUriParser8 parser;
			User::LeaveIfError(parser.Parse(iElementArray[1]));
			uri = CUri8::NewL(parser);
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		}
	return uri;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseEmailL
// ---------------------------------------------------------------------------
//
CDesC8ArraySeg* CSdpCodecParseUtil::ParseEmailL(TInt aErrCode)
	{
	TBool endloop = EFalse;
	while (iLineArray.Count() && !endloop)
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
												SdpCodecStringConstants::EEmail,
												iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{
			__ASSERT_ALWAYS (iElementArray.Count() > 1, 
				User::Leave(KErrSdpCodecEmailField));
			iEmailFields->AppendL(
				CSdpCodecParseUtil::FieldLineValueL(iLineArray[0]));
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		else
			{
			endloop = ETrue;
			}
		}
	CDesC8ArraySeg* array = iEmailFields;
	iEmailFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParsePhoneL
// ---------------------------------------------------------------------------
//
CDesC8ArraySeg* CSdpCodecParseUtil::ParsePhoneL(TInt aErrCode)
	{
	TBool endloop = EFalse;
	while (iLineArray.Count() && !endloop)
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
												SdpCodecStringConstants::EPhone,
												iLineArray[0],aErrCode);
		if(iElementArray.Count() != 0)
			{
			__ASSERT_ALWAYS (iElementArray.Count() > 1, 
				User::Leave(KErrSdpCodecPhoneField));
			iPhoneFields->AppendL(
				CSdpCodecParseUtil::FieldLineValueL(iLineArray[0]));
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		else
			{
			endloop = ETrue;
			}
		}
	CDesC8ArraySeg* array = iPhoneFields;
	iPhoneFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseConnectionL
// ---------------------------------------------------------------------------
//
CSdpConnectionField* CSdpCodecParseUtil::ParseConnectionL(TInt aErrCode)
	{
	CSdpConnectionField* sdpConnectionField = NULL;
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
										SdpCodecStringConstants::EConnection,
										iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{
			sdpConnectionField =  
				CSdpConnectionField::DecodeL(iLineArray[0]);
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		}
	return sdpConnectionField;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseBandwidthL
// ---------------------------------------------------------------------------
//
RPointerArray<CSdpBandwidthField>* 
CSdpCodecParseUtil::ParseBandwidthL(TInt aErrCode)
	{
	TBool endloop = EFalse;
	CSdpBandwidthField* bandwidth = NULL;
	while (iLineArray.Count() && !endloop)
		{
		iElementArray = 
		    CSdpCodecParseUtil::CheckOptionalFieldNameL(
		        iPool,SdpCodecStringConstants::EBandwidth,
		        iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{			
			bandwidth = CSdpBandwidthField::DecodeLC(iLineArray[0]);
			iBandwidthFields->AppendL(bandwidth);
			CleanupStack::Pop(bandwidth);
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		else
			{
			endloop = ETrue;
			}
		}
	RPointerArray<CSdpBandwidthField>* array = iBandwidthFields;
	iBandwidthFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseConnectionFieldsL
// ---------------------------------------------------------------------------
//
RPointerArray<CSdpConnectionField>* 
CSdpCodecParseUtil::ParseConnectionFieldsL(TInt aErrCode)
	{
	TBool endloop = EFalse;
	CSdpConnectionField* connection = NULL;
	while(iLineArray.Count() && !endloop)
		{
		iElementArray = 
		    CSdpCodecParseUtil::CheckOptionalFieldNameL(
		        iPool,SdpCodecStringConstants::EConnection,
		        iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{			
			connection = CSdpConnectionField::DecodeLC(iLineArray[0]);
			iConnectionFields->AppendL(connection);
			CleanupStack::Pop(connection);
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		else
			{
			endloop = ETrue;
			}
		}
	RPointerArray<CSdpConnectionField>* array = iConnectionFields;
	iConnectionFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseTimeFieldL
// ---------------------------------------------------------------------------
//
RPointerArray<CSdpTimeField>* 
CSdpCodecParseUtil::ParseTimeFieldL(TInt aErrCode)
	{
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckFieldNameL(iPool,
											SdpCodecStringConstants::ETime,
											iLineArray[0],aErrCode);
		iElementArray.Reset();
		CSdpTimeField* timefield = NULL;
		CSdpRepeatField* repeatfield = NULL;
		TBool endloop = EFalse;
		while(iLineArray.Count() && !endloop)
			{
			iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
												SdpCodecStringConstants::ETime,
												iLineArray[0],aErrCode);
			if(iElementArray.Count())
				{
				timefield = CSdpTimeField::DecodeLC(iLineArray[0]);
				User::LeaveIfError(iTimeFields->Append(timefield));
				CleanupStack::Pop();//timefield
				iElementArray.Reset();
				iLineArray.Remove(0);
				TBool repeatEnd = EFalse;
				while(iLineArray.Count() && !repeatEnd)
					{
					iElementArray = 
						CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
											SdpCodecStringConstants::ERepeat,
											iLineArray[0],aErrCode);
					if(iElementArray.Count())
						{
						repeatfield =
							CSdpRepeatField::DecodeLC(iLineArray[0]);
						User::LeaveIfError((timefield->RepeatFields()).Append(
																  repeatfield));
						CleanupStack::Pop();//repeatfield
						repeatfield = 0;
						iElementArray.Reset();
						iLineArray.Remove(0);
						}
					else
						{
						repeatEnd = ETrue;
						}
					}
				timefield = 0;
				}
			else
				{
				endloop = ETrue;
				}
			}
		}
	RPointerArray<CSdpTimeField>* array = iTimeFields;
	iTimeFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseZoneAdjustmentL
// ---------------------------------------------------------------------------
//
const TDesC8& CSdpCodecParseUtil::ParseZoneAdjustmentL(TInt aErrCode)
	{
	delete iToken;
	iToken = 0;
	iToken = KNullDesC8().AllocL();
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
											SdpCodecStringConstants::EZone,
											iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{
			__ASSERT_ALWAYS (iElementArray.Count() > 1, 
				User::Leave(KErrSdpCodecZoneField));
			delete iToken;
			iToken = 0;
			iToken = 
				(CSdpCodecParseUtil::FieldLineValueL(iLineArray[0])).AllocL();
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		}
	return *iToken;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseEncryptionKeyL
// ---------------------------------------------------------------------------
//
CSdpKeyField* CSdpCodecParseUtil::ParseEncryptionKeyL(TInt aErrCode)
	{
	CSdpKeyField* sdpKeyField = NULL;
	if(iLineArray.Count())
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
												SdpCodecStringConstants::EKey,
												iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{
			__ASSERT_ALWAYS (iElementArray.Count() > 1, 
				User::Leave(KErrSdpCodecKeyField));
			sdpKeyField = CSdpKeyField::DecodeL(iLineArray[0]);
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		}
	return sdpKeyField;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseAttributeFieldL
// ---------------------------------------------------------------------------
//
RPointerArray<CSdpAttributeField>* 
CSdpCodecParseUtil::ParseAttributeFieldL(TInt aErrCode)
	{
	TBool endloop = EFalse;
	CSdpAttributeField* attributefield = NULL;
	while(iLineArray.Count() && !endloop)
		{
		iElementArray = CSdpCodecParseUtil::CheckOptionalFieldNameL(iPool,
										SdpCodecStringConstants::EAttribute,
										iLineArray[0],aErrCode);
		if(iElementArray.Count())
			{
			attributefield = 
						CSdpAttributeField::DecodeLC(iLineArray[0]);
			User::LeaveIfError(iAttributeFields->Append(attributefield));
			CleanupStack::Pop();//attributefield
			attributefield = NULL;
			iElementArray.Reset();
			iLineArray.Remove(0);
			}
		else
			{
			endloop = ETrue;
			}
		}
	RPointerArray<CSdpAttributeField>* array = iAttributeFields;
	iAttributeFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::ParseMediaLevelL
// ---------------------------------------------------------------------------
//
RPointerArray<CSdpMediaField>* 
CSdpCodecParseUtil::ParseMediaLevelL()
	{
	RStringF headername = iPool.StringF( SdpCodecStringConstants::EMedia, 
                                         SdpCodecStringConstants::Table );
	TInt linestartPosition = 0;
	TInt lineEndPosition = 0;
	CSdpMediaField* mediafield = NULL;
	TBool endloop = EFalse;
	while(iData.Length() > 0 && !endloop)
		{
		linestartPosition = iData.FindF(headername.DesC());
		if(linestartPosition != KErrNotFound)
			{
			TPtrC8 firstline(iData.Mid(linestartPosition));
			TPtrC8 templine(iData.Mid(linestartPosition + 1));
			HBufC8* searchString = 
			 	HBufC8::NewLC(KCRLFStr().Length() + 
			 	headername.DesC().Length());
			TPtr8 strPtr(searchString->Des());
			strPtr.Append(KCRLFStr);
			strPtr.Append(headername.DesC());
			lineEndPosition = templine.FindF(strPtr);
			CleanupStack::PopAndDestroy(searchString);
			if(lineEndPosition == KErrNotFound)
				{
				mediafield = 
				CSdpMediaField::DecodeLC(iData.Mid(linestartPosition));
				User::LeaveIfError(iMediaFields->Append(mediafield));
				CleanupStack::Pop();//mediafield
				mediafield = 0;
				iElementArray.Reset();
				iLineArray.Reset();
				endloop = ETrue;
				}
			else 
				{
				mediafield = 
				CSdpMediaField::DecodeLC(firstline.Left(
									lineEndPosition+1+KCRLFStr().Length()));
				User::LeaveIfError(iMediaFields->Append(mediafield));
				CleanupStack::Pop();//mediafield
				mediafield = 0;
				iData.Set(firstline.Mid(lineEndPosition+1));
				}
			}
		else
			{
			endloop = ETrue;
			}
		}
	RPointerArray<CSdpMediaField>* array = iMediaFields;
	iMediaFields = 0;
	return array;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::FirstLineArrayElementL
// ---------------------------------------------------------------------------
//
RArray<TPtrC8> CSdpCodecParseUtil::FirstLineArrayElementL(RStringPool aPool,
												          TInt aIndex,
														  TInt aErrCode)
	{
	if(!iLineArray.Count())
			{
			User::Leave(aErrCode);
			}
	RArray<TPtrC8> elementArray = 
		SdpUtil::GetElementsFromLineL(iLineArray[0],aErrCode);
	CleanupClosePushL(elementArray);
	RStringF name = aPool.OpenFStringL(elementArray[0]);
	CleanupClosePushL(name);
	if(name!=(aPool.StringF(aIndex, SdpCodecStringConstants::Table)))
		{
		User::Leave(aErrCode);//parsererror
		}
	CleanupStack::Pop(2);//name, elementArray
	name.Close();
	return elementArray;
	}

// ---------------------------------------------------------------------------
// CSdpCodecParseUtil::LineArray
// ---------------------------------------------------------------------------
//
RArray<TPtrC8>& CSdpCodecParseUtil::LineArray()
	{
	return iLineArray;
	}