/*

* 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::CData

*

*/

/**

 @file

 @internalComponent

*/

#include "sisdata.h"

#include "sisdataunit.h"

namespace Swi

{

namespace Sis

{

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

	{

	CData* self = new(ELeave) CData(aDataProvider);

	CleanupStack::PushL(self);

	self->ConstructL(aBytesRead, aTypeReadBehaviour);

	return self;

	}

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

	{

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

	CleanupStack::Pop(self);

	return self;

	}

CData::CData(MSisDataProvider& aDataProvider) : iDataProvider(aDataProvider)

	{

	}

CData::~CData()

	{

	iDataUnits.ResetAndDestroy();	

	}

void CData::ConstructL(TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	TInt64 arrayBytes = 0;	

	CField::ConstructL(iDataProvider, EFieldTypeData, aBytesRead, aTypeReadBehaviour);	

	// Remember the offset where the data begins

	User::LeaveIfError(iDataProvider.Seek(ESeekCurrent, iOffset));

	ReadMemberArrayL(iDataProvider, iDataUnits, EFieldTypeDataUnit, arrayBytes, EReadType);

	// Calculate CRC of header and field data by reading the entire header and field

	TInt64 fieldOffset = iOffset - HeaderSize();

	User::LeaveIfError(iDataProvider.Seek(ESeekStart, fieldOffset));

	CField::CalculateCrcL(iDataProvider, HeaderSize() + Length() + PaddingSize(), iCrc );

	aBytesRead += Length() + PaddingSize();

	}

void CData::ReadDataL(RFile& aFile, TInt aFileIndex, TInt aDataUnit)

	{

	if ((aFileIndex < 0) || ((aDataUnit < 0) || (aDataUnit >= iDataUnits.Count())))

		{

		User::Leave(KErrCorrupt);

		}

	iDataUnits[aDataUnit]->ExtractDataFileL(aFile, aFileIndex);

	}

void CData::ReadDataL(RFile& aFile, TInt aFileIndex, TInt aDataUnit, TInt64 aLength)

	{

	if ((aFileIndex < 0) || ((aDataUnit < 0) || (aDataUnit >= iDataUnits.Count())))

		{

		User::Leave(KErrCorrupt);

		}

	iDataUnits[aDataUnit]->ExtractDataFileL(aFile, aFileIndex, aLength);

	}

void CData::AppendStubDataFieldL(RWriteStream& aWriteStream)

	{

	// The data field has the following structure

	//	Object 				Object Size (bytes)	Value

	//	FieldType 			4					EFieldTypeData		

	//  FieldLength			4					12

	//  data				12					The empty Data unit array 

	//  The empty data unit array inside the Data field has the following structure

	//	Object 				Object Size (bytes)	Value

	//  FieldType			4					EFieldTypeArray

	//	FieldLength			4					4

	// 	ArrayType			4					EFieldTypeDataUnit

	// append the EFieldTypeData header to the stream

	TBuf8<3 * sizeof(TInt32)> header;

	CField::CreateHeader(EFieldTypeData, TInt64(12), header);

	aWriteStream.WriteL(header);

	// append an empty array header to the stream

	CField::CreateHeader(EFieldTypeArray, TInt64(4), header);

	aWriteStream.WriteL(header);

	// append the array type to the stream

	TInt32 arrayType;

	TPckg<TInt32> pckg(arrayType);

	arrayType = static_cast<TInt32>(EFieldTypeDataUnit);

	aWriteStream.WriteL(pckg);

	}

} //namespace Sis

} //namespace Swi