/**

* Copyright (c) 2007-2009 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:

* Buffer Manager for Protocols

* 

*

*/

/**

 @file

*/

#if !defined(__MBufChain_inl__)

#define __MBufChain_inl__

////////////////////////////////////////////////////////////////////////////////

// MBUF CHAIN

////////////////////////////////////////////////////////////////////////////////

/**

Constructor

*/

inline RMBufChain::RMBufChain()

	{ iNext = NULL; }

/**

Constructor

*/

inline RMBufChain::RMBufChain(RMBuf* aChain) : iNext(aChain)

	{ iNext = aChain; }

/**

Rerurns the first in the chain

@return the first in the chain

*/

inline RMBuf* RMBufChain::First()

	{ return iNext; }

/**

Returns the first in the chain

@return the first in the chain

*/

inline const RMBuf* RMBufChain::First() const

	{ return iNext; }

/**

operator =

*/

inline RMBufChain& RMBufChain::operator =(RMBuf* aChain)

	{ iNext = aChain; return *this; }

/**

Initializes the members (iNext = NULL)

*/

inline void RMBufChain::Init()

	{ iNext = NULL;	}

/**

Check if empty, if empty returns true

*/

inline TBool RMBufChain::IsEmpty() const

	{ return iNext==NULL; }

#ifndef __KERNEL_MODE__

/**

Links a chain to the chain in the chain

@param aChain The chain to be linked

*/

inline void RMBufChain::Link(RMBufChain &aChain)

	{ if (!IsEmpty()) iNext->LinkPkt(aChain); }

/**

Unlink the nfirst in the chain

*/

inline void RMBufChain::Unlink()

	{ if (!IsEmpty()) iNext->UnlinkPkt(); }

/**

Returns next in the chain if there is next else returns the current

*/

inline RMBufChain& RMBufChain::Next()

	{ return IsEmpty() ? *this : iNext->NextPkt(); }

/**

Returns next in the chain if there is next else returns the current

*/

inline const RMBufChain& RMBufChain::Next() const

	{ return IsEmpty() ? *this : iNext->NextPkt(); }

/**

Goto specified byte offset into an Mbuf chain

Used as part of copyin/out, split etc to position

MBuf pointer and offset from start of iBuffer.

@param anOffset The offset

@param resBuf result buffer

@param resOffset result offset

@param resLength result length

@param resPrevBuf result previous Buf in the chain

@return ETrue if successful

*/

inline TBool RMBufChain::Goto(TInt anOffset, RMBuf* &resBuf, TInt& resOffset, TInt& resLength) const

	{ RMBuf* prev;  return Goto(anOffset, resBuf, resOffset, resLength, prev); }

#endif // KERNEL_MODE

#endif // __MBufChain_inl__