1 // file_reader.h

     2 // 

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

     4 // This component and the accompanying materials are made available

     5 // under the terms of the "Eclipse Public License v1.0"

     6 // which accompanies this distribution, and is available

     7 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 // 

     9 // Initial Contributors:

    10 // Accenture - Initial contribution

    11 //

    12 

    13 #ifndef __FILE_READER_H__

    14 #define __FILE_READER_H__

    15 

    16 #include <f32file.h>

    17 

    18 

    19 class MFileReaderObserver

    20 	{

    21 public:

    22 	enum TReadType

    23 		{

    24 		EFirst,

    25 		EMiddle,

    26 		ELast

    27 		};

    28 public:

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

    30 	virtual void HandleFileReadError(TInt aError) = 0;

    31 	};

    32 

    33 

    34 class CFileReader : public CActive

    35 	{

    36 public:

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

    38 	~CFileReader();

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

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

    41 private:

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

    43 	void ConstructL();

    44 	void ReadNextChunk();

    45 	void ReadNextDirectChunk();

    46 private:	// From CActive.

    47 	virtual void DoCancel();

    48 	virtual void RunL();

    49 private:

    50 	RFs& iFs;

    51 	MFileReaderObserver* iObserver;

    52 	TFileName iFileName;

    53 	TInt iBlockSize;

    54 	HBufC8* iBuf;

    55 	TPtr8 iPtr;

    56 	RFile iFile;

    57 	TBool iFirstRead;

    58 	TBool iDirect;

    59 	TInt iDirectOffset;

    60 	};

    61 

    62 

    63 #endif // __FILE_READER_H__