// Copyright (c) 2005-2010 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:

//

#include <s32buf.h>

#include "SqlAssert.h"

#include "IPCStream.h"

#include "SqlSrvResourceProfiler.h"

/**

Reads data from the stream buffer and sends them to the client.

@param aMessage The client message.

@return The number of bytes sent.

Usage of the IPC call arguments:

Arg 0:            not used

Arg 1: [in]       from which position to read

Arg 2: [in/out]   IPC buffer

Arg 3: [in]       max length of the requested data

*/

TInt HIpcStream::ReadL(const RMessage2& aMessage)

	{

	TInt pos=aMessage.Int1();

	if (pos!=iRPos)

		iHost.SeekL(iHost.ERead,EStreamBeginning,pos);

	iRPos=-1;

	TInt len=aMessage.Int3();

	pos+=len;

	TInt tfr=len;

	for (;;)

		{

		TUint8 buf[KIpcStreamSize];

		TInt read=iHost.ReadL(buf,Min(tfr,KIpcStreamSize));

		if (read==0)

			break;

		aMessage.WriteL(2,TPtrC8(buf,read),len-tfr);

		SQLPROFILER_REPORT_IPC(ESqlIpcWrite, read);

		tfr-=read;

		if (tfr==0)

			break;

		if (read<KIpcStreamSize)

			break;

		}

	iRPos=pos-tfr;

	return len-tfr;

	}

/**

Reads data from the client message and stores the data in the stream buffer.

@param aMessage The client message.

@return The number of bytes read and stored in the stream buffer.

Usage of the IPC call arguments:

Arg 0:            not used

Arg 1: [in]       from which position to write

Arg 2: [in/out]   IPC buffer

*/

void HIpcStream::WriteL(const RMessage2& aMessage)

	{

	TInt pos=aMessage.Int1();

	if (pos!=iWPos)

		iHost.SeekL(iHost.EWrite,EStreamBeginning,pos);

	iWPos=-1;

	TInt offset=0;

	TBuf8<KIpcStreamSize> buf;

	for (;;)

		{

		aMessage.ReadL(2,buf,offset);

		TInt len=buf.Length();

		SQLPROFILER_REPORT_IPC(ESqlIpcRead, len);

		if (len==0)

			break;

		iHost.WriteL(buf.Ptr(),len);

		offset+=len;

		if (len<KIpcStreamSize)

			break;

		}

	iWPos=pos+offset;

	}

/**

Destroys HIpcReadBuf object.

*/

void HIpcReadBuf::DoRelease()

	{

	delete this;

	}