commsfwutils/commsbufs/mbufmgr/src/mb_chn.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 21 Jun 2010 17:02:22 +0300
branchRCL_3
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child 23 cbb19216b74d
permissions -rw-r--r--
Revision: 201025 Kit: 2010125
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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Buffer Manager for Protocols (MBuf Chains)
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// 
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//
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#include <es_mbuf.h>
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#include <cflog.h>
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#include "commsbufpondintf.h"
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#include "commsbufpool.h"
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//
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// MBUF CHAIN
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//
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__IMPLEMENT_CLEANUP(RMBufChain, Free)
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EXPORT_C void RMBufChain::AllocL(TInt aLen)
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/**
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Allocate sufficient mbufs to hold specfied amount of data
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- Overloaded min/max variants (eg. refer RMBufChain::Alloc) deliberately do not exist because;
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  a. Intention is to ultimately deprecate (or at least discourage) the leaving variants since their usage is not typically (but not always
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     the case) recommended because they the throw/catch mechanism can hinder performance if used in appopriately.
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  b. Intention is to ultimately deprecate (or at least discourage) this class as it will likely be superceded by a generic system wide
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     equivalent.
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  c. If they shown to useful for this API, they can easily be added in the future... but the same can not be said for removing them in the future!
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@param aLen A length of the cell
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*/
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	{
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	RMBufAllocator allocator;
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	User::LeaveIfError(RCommsBufChain::Alloc(aLen, allocator));
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	}
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EXPORT_C TInt RMBufChain::Alloc(TInt aLen)
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/**
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Allocate sufficient mbufs to hold specfied amount of data
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@param aLen A length of the cell
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*/
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	{
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	RMBufAllocator allocator;	
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	return RCommsBufChain::Alloc(aLen, allocator);
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	}
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TInt RMBufChain::Alloc(TInt aLen, const RMBufChain &aMBufChain)
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/**
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Allocate sufficient mbufs to hold specfied amount of data
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@param aLen A length of the cell
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@return KErrNone if allocation is success 
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@return KErrNoMBufs if allocation is failed
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*/
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	{	
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	if(aMBufChain.First())
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		{
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		const RCommsBuf* commsBuf = static_cast<const RCommsBuf*>(aMBufChain.First());
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		iNext = commsBuf->Pool()->Pond().Alloc(aLen, commsBuf->RawSize(), commsBuf->RawSize());
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		return iNext ? KErrNone : KErrNoMBufs;		
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		}
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	RMBufAllocator allocator;
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	return RCommsBufChain::Alloc(aLen, allocator);	
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	}
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EXPORT_C TInt RMBufChain::Alloc(TInt aLen, TInt aMinMBufSize)
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	{
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	RMBufAllocator allocator;
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	return RCommsBufChain::Alloc(aLen, aMinMBufSize, allocator);
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	}
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EXPORT_C TInt RMBufChain::Alloc(TInt aLen, TInt aMinMBufSize, TInt aMaxMBufSize)
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	{
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	RMBufAllocator allocator;
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	return RCommsBufChain::Alloc(aLen, aMinMBufSize, aMaxMBufSize, allocator);
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	}
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// overloading for TLS
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EXPORT_C void RMBufChain::AllocL(TInt aLen, RMBufAllocator& aRMBufAllocator)
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	{
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	User::LeaveIfError(RCommsBufChain::Alloc(aLen, aRMBufAllocator));
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	}
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EXPORT_C TInt RMBufChain::Alloc(TInt aLen, RMBufAllocator& aRMBufAllocator)
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	{
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	return RCommsBufChain::Alloc(aLen, aRMBufAllocator);
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	}
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TInt RMBufChain::Alloc(TInt aLen, const RMBufChain& aMBufChain, RMBufAllocator& aRMBufAllocator)
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	{
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	if(aMBufChain.First())
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		{
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		return RCommsBufChain::Alloc(aLen, aMBufChain.First ()->Size(), aMBufChain.First ()->Size(), aRMBufAllocator);			
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		}
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	else
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		{
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		return RCommsBufChain::Alloc(aLen, aLen, aRMBufAllocator);	
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		}		
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	}
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EXPORT_C TInt RMBufChain::Alloc(TInt aLen, TInt aMinMBufSize, RMBufAllocator& aRMBufAllocator)
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	{
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	return RCommsBufChain::Alloc(aLen, aMinMBufSize, aRMBufAllocator);
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	}
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EXPORT_C TInt RMBufChain::Alloc(TInt aLen, TInt aMinMBufSize, TInt aMaxMBufSize, RMBufAllocator& aRMBufAllocator)
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	{
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	return RCommsBufChain::Alloc(aLen, aMinMBufSize, aMaxMBufSize, aRMBufAllocator);
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	}
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EXPORT_C TInt RMBufChain::ReAlloc(TInt aLen)
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/**
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Adjust the size of a chain, allocates a new memory for the chain
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- refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant
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@param aLen A new length
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*/
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	{
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	__ASSERT_ALWAYS(aLen>=0, CommsBuf::Panic(EMBuf_NegativeLength));
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	TInt currLen = Length();
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	if(aLen < currLen)
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		{
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		TrimEnd(aLen);			
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		}
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	else if(aLen > currLen)
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		{
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		TInt extraReq = aLen - currLen;
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		if(currLen > 0)
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			{
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			// Extend the final buf to consume any idle space
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			RMBuf* pLast = static_cast<RMBuf*>(Last());
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			TInt idleSpace = pLast->Size() - pLast->End();
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			ASSERT(idleSpace >= 0);
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			if(idleSpace)
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				{
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				TInt useSpace = Min(idleSpace, extraReq);
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				pLast->AdjustEnd(useSpace);
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				extraReq -= useSpace;
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				// Did this yield enough?
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				if(!extraReq)
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					{
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					return KErrNone;						
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					}
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				}
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			}
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		// Need additional allocation
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		RMBufChain extraChain;
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		TInt err = extraChain.Alloc(extraReq, *this);
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		if(err != KErrNone)
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			{
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			return err;
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			}
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		RCommsBufChain::Append(extraChain);
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		}
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	return KErrNone;
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	}
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EXPORT_C void RMBufChain::ReAllocL(TInt aLen)
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/**
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Adjust the size of a chain, allocates a new memory for the chain
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@param aLen A new length
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*/
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	{
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	User::LeaveIfError(ReAlloc(aLen));
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	}
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EXPORT_C TInt RMBufChain::Create(const TDesC8& aDes, TInt aHdrLen)
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/**
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Create an Mbuf chain from a descriptor optionally allowing room at front for a protocol header.
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- refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant
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@param aDes
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@param aHdrLen A header length
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*/
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	{
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	TInt err = Alloc(aDes.Length() + aHdrLen);
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	if(err == KErrNone)
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		{
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		CopyIn(aDes, aHdrLen);	// NB! old version prepended explicit buf. wonder if that matters?
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		}
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	return err;
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	}
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EXPORT_C void RMBufChain::CreateL(const TDesC8& aDes, TInt aHdrLen)
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/**
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Create an Mbuf chain from a descriptor optionally allowing room at front for a protocol header.
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@param aDes
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@param aHdrLen A header length
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*/
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	{
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	User::LeaveIfError(Create(aDes, aHdrLen));
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	}
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EXPORT_C void RMBufChain::FillZ(TInt aLen)
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/**
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Zero fill the first aLen bytes of an mbuf chain
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@param aLen the length (how many byte to be appended to the end)
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*/
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	{
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	__ASSERT_ALWAYS(iNext!=NULL, CommsBuf::Panic(EMBuf_EmptyChain));
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	TInt n;
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	RMBuf* m = static_cast<RMBuf*>(iNext);
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	while(aLen>0 && m!=NULL)
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		{
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			n = aLen < m->Length() ? aLen : m->Length();
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			Mem::FillZ(m->Ptr(), n);
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			aLen -= n;
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			m = m->Next();
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		}
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	}
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EXPORT_C void RMBufChain::CopyL(RMBufChain& newChain, TInt anOffset, TInt aLen) const
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/**
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Copy data into a new chain starting at a given offset
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into this chain.
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Allocate sufficient mbufs to hold specfied amount of data,
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optionally zeroing the buffers.
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@param aLen A length of the cell
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*/
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	{
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	User::LeaveIfError(Copy(newChain, anOffset, aLen, 0));
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	}
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EXPORT_C TInt RMBufChain::Copy(RMBufChain &newChain, TInt aOffset, TInt aLen, TInt aHdrReserve) const
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/**
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Copy data into a new chain starting at a given offset
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into this chain.
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- refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant
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@param newChain A new chain, where the data is copied to
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@param aOffset A offset,
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@param aLen the length of the data to be copied
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@param aHdrReserve Amount of space (bytes) to offset the start of data from the start of the first buffer, so allowing
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subsequent prepending without further allocation (typically used for protocol headers)
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*/
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	{
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 	__ASSERT_ALWAYS(iNext!=NULL, CommsBuf::Panic(EMBuf_EmptyChain));
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 	__ASSERT_ALWAYS(aLen>=0, CommsBuf::Panic(EMBuf_NegativeLength));
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 	__ASSERT_ALWAYS(aOffset>=0, CommsBuf::Panic(EMBuf_NegativeOffset));
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	TInt n, n1, n2;
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	TUint8* p1, *p2;
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	RMBuf* m1, *m2;
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	TInt len = Length();
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	if (aOffset>0)
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		{
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 		__ASSERT_ALWAYS(aOffset<len, CommsBuf::Panic(EMBuf_BadOffset));
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		n = len - aOffset;
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		len = Min(aLen, n);
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		}
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	else
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		{
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		len = Min(aLen, len);	
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		}		
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18
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// Suppress the "follow-the-leader" behaviour of preserving the buffer sizing of the
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// existing chain. The goal of preserving buffer characteristics remains desirable but
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// not at the cost of having TCP use unnecessarily small buffers - this area needs 
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// rework once the Comms stack really adopts buffer pools and zero copy  	
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//	TInt err = newChain.Alloc(len + aHdrReserve, *this);
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	TInt err;
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    if(First())
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        {
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        newChain.iNext = First()->Pool()->Pond().Alloc(len + aHdrReserve, 0, KMaxTInt);
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        err = newChain.iNext ? KErrNone : KErrNoMBufs;      
18
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        }
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    else
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        {
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        RMBufAllocator allocator;
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        err = newChain.Alloc(aLen + aHdrReserve, allocator);  
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        }
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0
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	if(err != KErrNone)
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		{
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		return err;
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		}
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	if (aOffset>0)
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		{
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		if ((m1 = static_cast<RMBuf*>(RCommsBufChain::Goto(aOffset, n, n1))) == NULL)
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			{
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			return KErrNone;				
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			}
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		p1 = m1->Buffer()+n;
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		}
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	else
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		{
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		m1 = static_cast<RMBuf*>(iNext);
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		p1 = m1->Ptr();
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		n1 = m1->Length();
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		}
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    if (aHdrReserve > 0)
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        {
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        m2 = static_cast<RMBuf*>(newChain.First());
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        if(aHdrReserve >= m2->Length())
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            {
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            // In principle we could have one or more buffers as header reserve, however it's not
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            // obvious whether a chain can contain wholly empty buffers in it, ie whether code
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            // walking the chain will have encountered such a situation. So we prevent this - in
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            // practice this shouldn't pose a problem as the expected use is reserving capacity
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            // within the copied buffer for subsequent pre-pending to avoid allocating another buf 
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            newChain.Free();
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            return KErrOverflow;
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            }
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        m2->SetData(aHdrReserve, m2->Length() - aHdrReserve);
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        p2 = m2->Ptr();
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        n2 = m2->Length();
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        }
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    else
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        {
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        m2 = static_cast<RMBuf*>(newChain.iNext);
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        p2 = m2->Ptr();
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        n2 = m2->Length();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   334
        }
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   335
    
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   336
	while (len>0)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   337
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   338
 		__ASSERT_DEBUG(n1>0 && n2>0, CommsBuf::Panic(EMBuf_NegativeLength));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   339
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   340
		n = n1 < n2 ? n1 : n2;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   341
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   342
		Mem::Copy(p2, p1, n);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   343
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   344
		if (n1 -= n, n1 == 0)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   345
			{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   346
			if (m1 = m1->Next(), m1==NULL)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   347
				{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   348
				break;					
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   349
				}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   350
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   351
			p1 = m1->Ptr();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   352
			n1 = m1->Length();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   353
			}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   354
		else
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   355
			{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   356
			p1 += n;	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   357
			}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   358
			
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   359
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   360
		if (n2 -= n, n2 == 0)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   361
			{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   362
			if (m2 = m2->Next(), m2==NULL)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   363
				{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   364
				break;					
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   365
				}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   366
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   367
			p2 = m2->Ptr();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   368
			n2 = m2->Length();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   369
			}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   370
		else
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   371
			{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   372
			p2 += n;	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   373
			}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   374
		len -= n;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   375
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   376
	return KErrNone;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   377
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   378
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   379
EXPORT_C void RMBufChain::CopyIn(const TDesC8& aDes, TInt aOffset/*=0*/)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   380
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   381
	RCommsBufChain::Write(aDes, aOffset);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   382
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   383
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   384
EXPORT_C void RMBufChain::CopyOut(TDes8& aDes, TInt aOffset) const
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   385
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   386
Copy data from an mbuf chain into linear buffer
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   387
starting at specified offset.
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   388
@param aDes the buffer to copy in to
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   389
@param aOffset the offset
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   390
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   391
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   392
	RCommsBufChain::Read(aDes, aOffset);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   393
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   394
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   395
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   396
EXPORT_C void RMBufChain::Assign(RMBufQ& aQueue)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   397
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   398
Take ownership of Mbuf from a queue
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   399
Previously allocated data (e.g. by a call to RMBufChain::AllocL) in the chain must be
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   400
emptied (e.g. by calling RMBufChain::Free) before the assignment
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   401
@param aQueue the queue
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   402
@see RMBufChain::IsEmpty()
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   403
@see RMBufChain::Free()
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   404
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   405
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   406
	__ASSERT_ALWAYS(iNext==NULL, CommsBuf::Panic(EMBuf_NotEmptyChain));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   407
	iNext = aQueue.First();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   408
	aQueue.Init();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   409
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   410
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   411
EXPORT_C void RMBufChain::Assign(RMBufChain& aChain)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   412
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   413
	RCommsBufChain::Assign(aChain);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   414
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   415
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   416
EXPORT_C void RMBufChain::Append(RMBufChain& aChain)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   417
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   418
	RCommsBufChain::Append(aChain);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   419
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   420
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   421
EXPORT_C void RMBufChain::AppendL(TInt aLen)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   422
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   423
Append space to the end of a MBuf chain
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   424
@param aLen the length (how many byte to be appended to the end)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   425
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   426
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   427
	User::LeaveIfError(Append(aLen));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   428
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   429
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   430
EXPORT_C TInt RMBufChain::Append(TInt aLen)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   431
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   432
Append space to the end of a MBuf chain 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   433
- refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   434
@param aLen the length (how many byte to be appended to the end) 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   435
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   436
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   437
	if(iNext == NULL)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   438
		{		
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   439
		RMBufAllocator allocator;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   440
		return Append(aLen, allocator);		
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   441
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   442
	return RCommsBufChain::Append(aLen);		
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   443
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   444
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   445
// overloading for TLS
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   446
EXPORT_C TInt RMBufChain::Append(TInt aLen, RMBufAllocator& aRMBufAllocator)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   447
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   448
	RMBuf* buf = static_cast<RMBuf*>(aRMBufAllocator.iPond.Alloc(aLen, 0, KMaxTInt));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   449
	if(buf == NULL)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   450
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   451
		return KErrNoMBufs;			
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   452
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   453
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   454
	RCommsBufChain::Append(buf);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   455
	return KErrNone;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   456
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   457
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   458
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   459
EXPORT_C RMBuf* RMBufChain::Remove()
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   460
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   461
Removes and returns the first RCommsBuf. The ownership of the returned RCommsBuf is with the caller
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   462
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   463
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   464
	RMBuf* buf = static_cast<RMBuf*>(iNext);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   465
	if(buf)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   466
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   467
		iNext = buf->Next();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   468
		buf->Unlink();
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   469
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   470
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   471
	return buf;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   472
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   473
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   474
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   475
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   476
EXPORT_C void RMBufChain::PrependL(TInt aLen)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   477
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   478
Prepend space onto the front of a chain
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   479
@param aLen the length of the space
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   480
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   481
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   482
	User::LeaveIfError(Prepend(aLen));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   483
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   484
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   485
EXPORT_C TInt RMBufChain::Prepend(TInt aLen)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   486
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   487
Prepend space onto the front of a chain 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   488
- refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   489
@param aLen the length of the space 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   490
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   491
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   492
	if(iNext)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   493
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   494
		return RCommsBufChain::Prepend(aLen);					
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   495
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   496
	RMBufAllocator allocator;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   497
	return Prepend(aLen, allocator);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   498
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   499
	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   500
// overloading for TLS
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   501
EXPORT_C TInt RMBufChain::Prepend(TInt aLen, RMBufAllocator& aRMBufAllocator)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   502
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   503
	RMBuf* buf = static_cast<RMBuf*>(aRMBufAllocator.iPond.Alloc(aLen, 0, KMaxTInt));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   504
	if(buf == NULL)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   505
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   506
		return KErrNoMBufs;			
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   507
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   508
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   509
	RMBufChain chain(buf);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   510
	RCommsBufChain::Prepend(chain);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   511
	return KErrNone;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   512
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   513
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   514
EXPORT_C void RMBufChain::Prepend(RMBuf* aBuf)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   515
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   516
	RCommsBufChain::Prepend(aBuf);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   517
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   518
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   519
EXPORT_C void RMBufChain::Prepend(RMBufChain& aChain)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   520
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   521
	RCommsBufChain::Prepend(aChain);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   522
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   523
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   524
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   525
EXPORT_C TInt RMBufChain::NumBufs() const
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   526
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   527
Count the number of buffers in a chain
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   528
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   529
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   530
	__ASSERT_ALWAYS(iNext!=NULL, CommsBuf::Panic(EMBuf_EmptyChain));
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   531
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   532
	TInt len = 0;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   533
	RMBuf* m = static_cast<RMBuf*>(iNext);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   534
	for (; m!=NULL; m = m->Next())
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   535
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   536
		len++;			
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   537
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   538
	return len;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   539
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   540
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   541
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   542
EXPORT_C void RMBufChain::SplitL(TInt anOffset, RMBufChain& newChain)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   543
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   544
Split a chain into two new chains
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   545
Original chain gets the 1st half
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   546
newChain gets the other half.
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   547
@param anOffset The offset
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   548
@param newChain The result chain
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   549
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   550
	{
18
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   551
	User::LeaveIfError(Split(anOffset, newChain));
0
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   552
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   553
18
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   554
EXPORT_C TInt RMBufChain::Split(TInt aOffset, RMBufChain& aNewChain)
0
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   555
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   556
Split a chain into two new chains Original chain gets the 1st half 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   557
newChain gets the other half. 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   558
- refer RMBufChain::AllocL notes regarding the deliberate decision not to provide an overloaded min/max mbuf size variant 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   559
@param anOffset The offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   560
@param newChain The result chain 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   561
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   562
	{
18
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   563
    // RCommsBuf::Split() will not allocate a smaller buffer size than the current, as part of its approach of (trying to)
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   564
    // support zero-copy transfer by respecting the buffer pool in use. This work is incomplete (needs support throughout
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   565
    // the stack and probably a cleverer idea of what constitutes an acceptable buffer than simply size), so in the meantime
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   566
    // having MBufMgr reflect this behaviour by refusing to Split() a big buf into smaller bufs is unnecessarily purist.
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   567
    // Hence the functionality is implemented directly here
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   568
    
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   569
    __ASSERT_ALWAYS(iNext!=NULL, CommsBuf::Panic(EMBuf_EmptyChain));
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   570
    __ASSERT_ALWAYS(aOffset>=0, CommsBuf::Panic(EMBuf_NegativeOffset));
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   571
    
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   572
    // For testing post-conditions
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   573
#ifdef _DEBUG
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   574
    TInt origLen = Length();
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   575
#endif
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   576
    TInt splitBufOffset;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   577
    TInt splitBufRemainder;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   578
    RMBuf* splitBuf;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   579
    RMBuf* splitBufPrev;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   580
    
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   581
    if(!Goto(aOffset, splitBuf, splitBufOffset, splitBufRemainder, splitBufPrev))
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   582
        {
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   583
        aNewChain.Init();
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   584
        return KErrNone;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   585
        }
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   586
    
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   587
    if(splitBufOffset != splitBuf->Offset()) // Not on an mbuf boundary
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   588
        {
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   589
        // Copy tail of splitBuf out to a new chain (hopefully a single buf, but needn't be)
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   590
        TInt splitDataOffset = splitBufOffset - splitBuf->Offset();
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   591
        TInt err = RMBufChain(splitBuf).Copy(aNewChain, splitDataOffset, splitBufRemainder);
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   592
        if(err != KErrNone)
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   593
            {
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   594
            return err;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   595
            }
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   596
        splitBuf->AdjustDataEnd(-splitBufRemainder);
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   597
        RMBufChain splitTail(splitBuf->Next());
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   598
        aNewChain.Append(splitTail);
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   599
        splitBuf->SetNext(NULL);
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   600
        }
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   601
    else
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   602
        {
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   603
        // Split cleaves chain between bufs
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   604
        aNewChain = splitBuf;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   605
        if(splitBufPrev)
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   606
            {
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   607
            splitBufPrev->Unlink();
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   608
            }
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   609
        }
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   610
    
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   611
    // Check post-conditions
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   612
#ifdef _DEBUG
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   613
    TInt frag1Len = Length(); 
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   614
    TInt frag2Len = aNewChain.Length();
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   615
    ASSERT(origLen == frag1Len + frag2Len);
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   616
    ASSERT(frag1Len == aOffset);
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   617
#endif
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   618
    return KErrNone;
9644881fedd0 Revision: 201021
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents: 0
diff changeset
   619
	}           
0
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   620
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   621
// overloading for TLS
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   622
EXPORT_C TInt RMBufChain::Split(TInt anOffset, RMBufChain& newChain, RMBufAllocator& /* aRMBufAllocator */)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   623
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   624
	return RCommsBufChain::Split ( anOffset, newChain );
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   625
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   626
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   627
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   628
EXPORT_C void RMBufChain::Free()
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   629
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   630
Free an MBuf chain, returning it to the free Pool 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   631
A pointer to the first mbuf of the next packet is returned. 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   632
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   633
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   634
	RCommsBufChain::Free ();	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   635
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   636
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   637
EXPORT_C void RMBufChain::TrimStart(TInt nBytes)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   638
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   639
Trim chain upto offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   640
@param anOffset The offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   641
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   642
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   643
	RCommsBufChain::TrimStart(nBytes);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   644
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   645
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   646
EXPORT_C void RMBufChain::TrimEnd(TInt anOffset)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   647
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   648
Trim chain after offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   649
@param anOffset The offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   650
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   651
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   652
	RCommsBufChain::TrimEnd(anOffset);	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   653
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   654
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   655
EXPORT_C TBool RMBufChain::Goto(TInt anOffset, RMBuf* &resBuf, TInt& resOffset, TInt& resLength, RMBuf* &resPrevBuf) const
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   656
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   657
Goto specified byte offset into an Mbuf chain. Used as part of copyin/out, split etc to position 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   658
MBuf pointer and offset from start of iBuffer. 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   659
@param anOffset The offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   660
@param resBuf result buffer 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   661
@param resOffset result offset 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   662
@param resLength result length 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   663
@param resPrevBuf result previous Buf in the chain 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   664
@return ETrue if successful 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   665
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   666
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   667
	RCommsBuf* commsResBuf;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   668
	RCommsBuf* commsResPrevBuf;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   669
	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   670
	commsResBuf = RCommsBufChain::Goto(anOffset, resOffset, resLength, commsResPrevBuf); 	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   671
	if(commsResBuf)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   672
		{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   673
		resBuf = static_cast<RMBuf*>(commsResBuf);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   674
		resPrevBuf = static_cast<RMBuf*>(commsResPrevBuf);
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   675
		return ETrue;
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   676
		}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   677
	return EFalse;	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   678
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   679
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   680
EXPORT_C TInt RMBufChain::Length() const
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   681
/** 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   682
Return the number of bytes of actual data contained in an MBuf chain 	  	 
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   683
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   684
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   685
	return RCommsBufChain::Length ();	
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   686
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   687
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   688
EXPORT_C RMBuf* RMBufChain::Last() const
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   689
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   690
Find the last MBuf in a chain
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   691
@return the last MBuf in the chain
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   692
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   693
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   694
	return static_cast<RMBuf*>(RCommsBufChain::Last());
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   695
	}
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   696
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   697
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   698
EXPORT_C TInt RMBufChain::Align(TInt aSize)
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   699
/**
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   700
Ensure that the first aSize bytes can be safely cast
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   701
to a structure of size aSize.
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   702
@param aSize A size
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   703
@return the number of bytes actually aligned. This will be the min of aSize and chain length.
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   704
*/
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   705
	{
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   706
	return RCommsBufChain::Align ( aSize );
dfb7c4ff071f Revision: 200951
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   707
	}