sl@0: /*
sl@0: * Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: * Library to add s32strm support for IPC (ie. stream via multiple IPC read/writes instead of
sl@0: * copying to a buffer and streaming to/from there.
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: /**
sl@0:  @file
sl@0: */
sl@0: #include "ipcbuf.h"
sl@0: 
sl@0: 
sl@0: EXPORT_C void RIpcBuf::Open(const RMessagePtr2& aMessage, TInt aMessageSlot)
sl@0: 	{
sl@0: 	iMessage = aMessage;
sl@0: 	iMessageSlot = aMessageSlot;
sl@0: 	iReadPos = 0;
sl@0: 	iWritePos = 0;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TStreamPos RIpcBuf::DoSeekL(TMark aMark, TStreamLocation aLocation, TInt anOffset)
sl@0: 	{
sl@0: 
sl@0: 	TInt size = iMessage.GetDesLengthL(iMessageSlot);
sl@0: 
sl@0: 	switch (aLocation)
sl@0: 		{
sl@0: 	case EStreamBeginning:
sl@0: 		// do nothing
sl@0: 		break;
sl@0: 		
sl@0: 	case EStreamMark:
sl@0: 		if (aMark&ERead)
sl@0: 			{
sl@0: 			anOffset += iReadPos;
sl@0: 			}
sl@0: 		else if (aMark&EWrite)
sl@0: 			{
sl@0: 			anOffset += iWritePos;
sl@0: 			}
sl@0: 		break;
sl@0: 		
sl@0: 	case EStreamEnd:
sl@0: 		anOffset += size;
sl@0: 		break;
sl@0: 		
sl@0: 	default:
sl@0: 		User::Panic(KIpcBufPanic, EIpcBufSeekUnknownLocation);
sl@0: 		break;
sl@0: 		}
sl@0: 		
sl@0: 	// offset can't be negative or greater than size
sl@0: 	if (anOffset > size || anOffset < 0)
sl@0: 		{
sl@0: 		User::Panic(KIpcBufPanic, EIpcBufSeekBadOffset);
sl@0: 		}
sl@0: 		
sl@0: 	if (aMark&ERead)
sl@0: 		{
sl@0: 		iReadPos = anOffset;
sl@0: 		}
sl@0: 	else if (aMark&EWrite)
sl@0: 		{
sl@0: 		iWritePos = anOffset;
sl@0: 		}
sl@0: 		
sl@0: 	return TStreamPos(anOffset);
sl@0: 	}
sl@0: 	
sl@0: EXPORT_C TInt RIpcBuf::DoReadL(TAny *aPtr, TInt aMaxLength)
sl@0: 	{
sl@0: 	TPtr8 ptr((TUint8*)aPtr, aMaxLength);
sl@0: 	iMessage.ReadL(iMessageSlot, ptr, iReadPos);
sl@0: 	TInt len = ptr.Length();
sl@0: 	iReadPos += len;
sl@0: 	return len;
sl@0: 	}
sl@0: 	
sl@0: EXPORT_C void RIpcBuf::DoWriteL(const TAny* aPtr,TInt aLength)
sl@0: 	{
sl@0: 	TPtr8 ptr((TUint8*)aPtr, aLength, aLength);
sl@0: 	iMessage.WriteL(iMessageSlot, ptr, iWritePos);
sl@0: 	iWritePos += aLength;
sl@0: 	}