// file_reader.h

// 

// Copyright (c) 2005 - 2010 Accenture. All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the "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:

// Accenture - Initial contribution

//

#ifndef __FILE_READER_H__

#define __FILE_READER_H__

#include <f32file.h>

class MFileReaderObserver

	{

public:

	enum TReadType

		{

		EFirst,

		EMiddle,

		ELast

		};

public:

	virtual void HandleFileData(const TDesC8& aData, TReadType aType, TBool& aContinue) = 0;

	virtual void HandleFileReadError(TInt aError) = 0;

	};

class CFileReader : public CActive

	{

public:

	static CFileReader* NewL(TInt aBlockSize, RFs& aFs, TBool aDirect);

	~CFileReader();

	void Read(const TDesC& aFileName, MFileReaderObserver& aObserver);

	void Read(const TDesC& aFileName, TInt aOffset, MFileReaderObserver& aObserver);

private:

	CFileReader(RFs& aFs, TBool aDirect, TInt aBlockSize);

	void ConstructL();

	void ReadNextChunk();

	void ReadNextDirectChunk();

private:	// From CActive.

	virtual void DoCancel();

	virtual void RunL();

private:

	RFs& iFs;

	MFileReaderObserver* iObserver;

	TFileName iFileName;

	TInt iBlockSize;

	HBufC8* iBuf;

	TPtr8 iPtr;

	RFile iFile;

	TBool iFirstRead;

	TBool iDirect;

	TInt iDirectOffset;

	};

#endif // __FILE_READER_H__