/**
* 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__