/*

* 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::CString

*

*/

/**

 @file sisstring.cpp

*/

#include <e32def.h>

#include "sisstring.h"

#include "sisfieldtypes.h"

#include "sisdataprovider.h"

#include "sisinstallerrors.h"

using namespace Swi::Sis;

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

	{

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

	CleanupStack::PushL(self);

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

	return self;

	}

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

	{

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

	CleanupStack::Pop(self);

	return self;

	}

EXPORT_C CString* CString::NewL(TPtrProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	CString* self = CString::NewLC(aDataProvider, aBytesRead, aTypeReadBehaviour);

	CleanupStack::Pop(self);

	return self;	

	}

EXPORT_C CString* CString::NewLC(TPtrProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	CString* self = new (ELeave) CString;

	CleanupStack::PushL(self);

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

	return self;

	}

CString::CString()

	{

	}

EXPORT_C CString::~CString()

	{

	delete iData;

	}

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

	{

	TInt64 fieldOffset = aBytesRead;

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

	// If string has an Odd Length, something is wrong.

	if (I64LOW(Length()) & 0x1)

		{

		User::Leave(KErrSISInvalidStringLength);

		}

	if (I64HIGH(Length()))

		{

		// Length is either -ve or to big for a string

		User::Leave(KErrSISStringInvalidLength);

		}

	TInt32 stringLength=I64LOW(Length()) / 2;

	iData= HBufC::NewL(stringLength);

	TPtr8 p(const_cast<TUint8*>(reinterpret_cast<const TUint8*>(iData->Des().Ptr())) , stringLength*2);

	p.SetLength(stringLength*2);

	CField::CheckedReadL(aDataProvider, p, stringLength*2, aBytesRead);

	iData->Des().SetLength(stringLength);

	iDataPtr.Set(*iData);

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

	}

void CString::ConstructL(TPtrProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

	{

	TInt64 fieldOffset = aBytesRead;

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

	// If string has an Odd Length, something is wrong.

	if (I64LOW(Length()) & 0x1)

		{

		User::Leave(KErrSISInvalidStringLength);

		}

	if (I64HIGH(Length()))

		{

		// Length is either -ve or to big for a string

		User::Leave(KErrSISStringInvalidLength);

		}

	TInt32 stringLength=I64LOW(Length());

	// get a pointer to the underlying data.

	const TUint8* ptr = aDataProvider.ReadL(stringLength).Ptr();

	aBytesRead += stringLength;

	// cast it to a TUint16 and construct the pointer from it.

	stringLength /= 2;

	const TUint16* uPtr = reinterpret_cast<const TUint16*>(ptr);

	iDataPtr.Set(uPtr, stringLength);

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

	}