// Copyright (c) 1997-2009 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:

// Packet Info Headers

// 

//

#include <nifmbuf.h>

EXPORT_C TMBufMark::TMBufMark()

	{

	iMBuf = NULL;

	iPtr = 0;

	iOffset = -1;

	}

EXPORT_C TMBufMark::TMBufMark(const TMBufMark& aParser)

	{

	iMBuf = aParser.iMBuf;

	iPtr = aParser.iPtr;

	iOffset = aParser.iOffset;

	}

EXPORT_C TMBufMark::TMBufMark(const RMBufChain& aChain, TInt aOffset/*=0*/)

	{

	Set(aChain, aOffset);

	}

EXPORT_C void TMBufMark::Set(const RMBufChain& aChain, TInt aOffset)

	{

	iOffset = aOffset;

	if (aOffset!=0)

		{

		TInt n, o;

		aChain.Goto(aOffset, iMBuf, o, n);

		iPtr = o-iMBuf->Offset();

		}

	else

		{

		iMBuf = (RMBuf*)aChain.First();

		iPtr = 0;

		}

	}

EXPORT_C void TMBufMark::Skip(TInt aLength)

//

// Skip over data

//

	{

	while (aLength>0 && iMBuf!=NULL)

		{

		TInt n = Min(iMBuf->Length()-iPtr, aLength);

		aLength -= n;		

		iOffset += n;

		iPtr += n;

		if (iPtr>iMBuf->Length())

			{

			iPtr = 0;

			iMBuf = iMBuf->Next();

			}

		}

	}

EXPORT_C void TMBufMark::Get(TDes8& aBuf)

//

// Get data into a descriptor

//

	{

	TInt len = aBuf.Length();

	TUint8* ptr = (TUint8*)aBuf.Ptr();

	while (len>0 && iMBuf!=NULL)

		{

		TInt n = Min(iMBuf->Length()-iPtr, len);

		Mem::Copy(ptr, iMBuf->Ptr()+iPtr, n);

		len -= n;		

		ptr += n;

		iOffset += n;

		iPtr += n;

		if (iPtr>iMBuf->Length())

			{

			iPtr = 0;

			iMBuf = iMBuf->Next();

			}

		}

	if (len>0)

		aBuf.SetLength(aBuf.Length()-len);

	}

EXPORT_C void TMBufMark::Get(TUint8* aPtr, TInt aLen)

//

// Get data into a buffer

//

	{

	while (aLen>0 && iMBuf!=NULL)

		{

		TInt n = Min(iMBuf->Length()-iPtr, aLen);

		Mem::Copy(aPtr, iMBuf->Ptr()+iPtr, n);

		aLen -= n;		

		aPtr += n;

		iOffset += n;

		iPtr += n;

		if (iPtr>iMBuf->Length())

			{

			iPtr = 0;

			iMBuf = iMBuf->Next();

			}

		}

	}