/*

* Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* Definition of the Swi::Sis::CCrc

*

*/

#include "siscrc.h"

using namespace Swi::Sis;

/*static*/ CCrc* CCrc::NewLC(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	CCrc* self = new(ELeave) CCrc();

	CleanupStack::PushL(self);

	self->ConstructL(aDataProvider, aBytesRead, aTypeReadBehaviour);

	return self;

	}

/*static*/ CCrc* CCrc::NewL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	CCrc* self = NewLC(aDataProvider, aBytesRead, aTypeReadBehaviour);

	CleanupStack::Pop(self);

	return self;

	}

CCrc::CCrc()

	{

	}

CCrc::~CCrc()

	{

	}

void CCrc::ConstructL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	TInt64 fieldOffset = aBytesRead;

	if (aTypeReadBehaviour == EReadType)

		{

		TFieldType fieldType;

		CField::ReadEnumL<TFieldType,TUint32>(aDataProvider, fieldType, aBytesRead);

		if ((fieldType != EFieldTypeControllerCRC) || (fieldType != EFieldTypeDataCRC))

			{

			User::Leave(KErrSISUnexpectedFieldType);			

			}

		}

	else

		{

		CField::ConstructL(aDataProvider, EFieldTypeControllerCRC, aBytesRead, aTypeReadBehaviour);			

		}

	CField::ReadTTypeL(aDataProvider, iChecksum, aBytesRead);

	CField::SkipUnknownFieldsL(aDataProvider, aBytesRead - fieldOffset, aBytesRead, aTypeReadBehaviour);

	CField::EnsureAlignedL(aDataProvider, aBytesRead - fieldOffset, aBytesRead, aTypeReadBehaviour);

	}