sl@0: // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "ShiftedFileStore.h"
sl@0: 
sl@0: /**
sl@0: @internalComponent
sl@0: CShiftedFileStore::OpenLC(RFs& aFs, const TDesC& aName, TUint aFileMode, TUint aFileOffset) method.
sl@0: CFileStore::OpenL(RFs& aFs,const TDesC& aName,TUint aFileMode,const TFileStoreFactoryFunction aFactory[])
sl@0: method was used as an origin for the method's source code.
sl@0: */
sl@0: CShiftedFileStore* CShiftedFileStore::OpenLC(RFs& aFs, const TDesC& aName, TUint aFileMode, TUint aFileOffset)
sl@0: 	{
sl@0: 	RFile file;
sl@0: 	User::LeaveIfError(file.Open(aFs, aName, aFileMode));
sl@0: 	CShiftedFileStore* store = FromL(file, aFileOffset);
sl@0: 	CleanupStack::PushL(store);
sl@0: 	return store;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: @internalComponent
sl@0: CShiftedFileStore::FromL(RFile& aFile, TUint aFileOffset) method.
sl@0: CFileStore::FromL(RFile& aFile,TFileStoreFactoryFunction aFunction) method was used as an origin
sl@0: for the method's source code. The only difference is that RFileBuf::Attach is called with possibly
sl@0: non-zero offset. The original implementation always calls RFileBuf::Attach with zero offset.
sl@0: */
sl@0: CShiftedFileStore* CShiftedFileStore::FromL(RFile& aFile, TUint aFileOffset)
sl@0: 	{
sl@0: 	if (static_cast<TInt>(aFileOffset) < 0)
sl@0: 		User::Leave(KErrArgument);
sl@0: 	RFileBuf buf;
sl@0: 	buf.Attach(aFile, static_cast <TInt> (aFileOffset));
sl@0: 	buf.PushL();
sl@0: 	RReadStream stream(&buf);
sl@0: 	TCheckedUid chk;
sl@0: 	stream >> chk;
sl@0: 	CFileStore* store = (*KDirectFileStoreFactoryFunction)(buf, chk.UidType());
sl@0: 	if(store == NULL)
sl@0: 		User::Leave(KErrNotSupported);
sl@0: 	//CleanupStack::Pop(2) is called, because:
sl@0: 	//1) buf.PushL() - actually MStreamBuf::PushL() is called and it pushes buf 
sl@0: 	//                 into CleanupStack.
sl@0: 	//1) CFileStore* store = (*KDirectFileStoreFactoryFunction)(buf, chk.UidType()) -
sl@0: 	//                 FileStoreFactory::DirectLC() is called.
sl@0: 	CleanupStack::Pop(2);
sl@0: 	return static_cast <CShiftedFileStore*> (store);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: @internalComponent
sl@0: Constructor. Prevents compiler warnings.
sl@0: Actually, CShiftedFileStore instance is newer created. CFileStore or CDirectFileStore
sl@0: instance is created and downcasted to CShiftedFileStore. It is possible to do that:
sl@0: CShiftedFileStore doesn't have data members at all.
sl@0: */
sl@0: CShiftedFileStore::CShiftedFileStore(RFile& aFile) :
sl@0: 	CDirectFileStore(aFile)
sl@0: 	{
sl@0: 	}
sl@0: