/*

* Copyright (c) 1997-2010 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 "RequestHeader.h"

#include "OstTraceDefinitions.h"

#ifdef OST_TRACE_COMPILER_IN_USE

#include "RequestHeaderTraces.h"

#endif

const TDesC8& TUsbRequestHdr::Des()

/**

 * This function packs the TUsbRequestHdr class into a descriptor with the

 * correct byte alignment for transmission on the USB bus.

 *

 * @return Correctly-aligned buffer. NB The buffer returned is a member of 

 * this class and has the same lifetime.

 */

	{

	OstTraceFunctionEntry0( TUSBREQUESTHDR_DES_ENTRY );

	iBuffer.SetLength(KUsbRequestHdrSize);

	iBuffer[0] = iRequestType;

	iBuffer[1] = iRequest;

	iBuffer[2] = static_cast<TUint8>(iValue & 0x00ff);

	iBuffer[3] = static_cast<TUint8>((iValue & 0xff00) >> 8);

	iBuffer[4] = static_cast<TUint8>(iIndex & 0x00ff);

	iBuffer[5] = static_cast<TUint8>((iIndex & 0xff00) >> 8);

	iBuffer[6] = static_cast<TUint8>(iLength & 0x00ff);

	iBuffer[7] = static_cast<TUint8>((iLength & 0xff00) >> 8);

	OstTraceFunctionExit0( TUSBREQUESTHDR_DES_EXIT );

	return iBuffer;

	}

TInt TUsbRequestHdr::Decode(const TDesC8& aBuffer, TUsbRequestHdr& aTarget)

/**

 * This function unpacks into the TUsbRequestHdr class from a descriptor with 

 * the alignment that would be introduced on the USB bus.

 *

 * @param aBuffer Input buffer

 * @param aTarget Unpacked header.

 * @return Error.

 */

	{

	OstTraceFunctionEntry0( TUSBREQUESTHDR_DECODE_ENTRY );

	if (aBuffer.Length() < static_cast<TInt>(KUsbRequestHdrSize))

		{

		OstTraceFunctionExit0( TUSBREQUESTHDR_DECODE_EXIT );

		return KErrGeneral;

		}

	aTarget.iRequestType = aBuffer[0];

	aTarget.iRequest = aBuffer[1];

	aTarget.iValue	 = static_cast<TUint16>(aBuffer[2] + (aBuffer[3] << 8));

	aTarget.iIndex	 = static_cast<TUint16>(aBuffer[4] + (aBuffer[5] << 8));

	aTarget.iLength  = static_cast<TUint16>(aBuffer[6] + (aBuffer[7] << 8));

	OstTraceFunctionExit0( TUSBREQUESTHDR_DECODE_EXIT_DUP1 );

	return KErrNone;

	}

TBool TUsbRequestHdr::IsDataResponseRequired() const

/**

 * This function determines whether data is required by the host in response 

 * to a message header.

 * @return TBool	Flag indicating whether a data response required.

 */

	{

	OstTraceFunctionEntry0( TUSBREQUESTHDR_ISDATARESPONSEREQUIRED_ENTRY );

	return (iRequestType & 0x80) ? ETrue : EFalse;

	}

//

// End of file