diff -r 000000000000 -r ba25891c3a9e installationservices/swi/source/sisfile/siscrc.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/installationservices/swi/source/sisfile/siscrc.cpp	Thu Dec 17 08:51:10 2009 +0200
@@ -0,0 +1,70 @@
+/*
+* 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);
+	}