// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

//

#ifndef _ZIP_FILE_MEMBER_INPUT_STREAM_H_

#define _ZIP_FILE_MEMBER_INPUT_STREAM_H_

#include <zlib.h>

#include <localtypes.h>

#include <s32file.h>

class CZipFile;

/**

A RZipFileMemberReaderStream represents a input stream for compressed files in the archive. 

This is a friend class to CZipFile. In order to create a input stream for a file in the archive,

CZipFile will call its member function GetInputStreamL() by passing a pointer to 

RZipFileMemberReaderStream and the function will return the input stream for the file

Note: This class is actually a C class as it derives from CBase

@publishedAll

@released

*/

class RZipFileMemberReaderStream : public CBase

	{

friend class CZipFile;

public:

	IMPORT_C ~RZipFileMemberReaderStream();

	IMPORT_C TInt Read(TDes16& aDes, TInt aLength);

	/**

	Overload version of the RZipFileMemberReaderStream read method.

	On return, contains the data read from the stream buffer.

	@param aDes The target descriptor for the data read from the stream buffer

	@param aLength The maximum number of bytes to be read

	@return KErrNone If all bytes read successfully.

	@return	KErrCorrupt If reading fails.

	@return KErrEof If end of file is reached.

	@return ... Any one of the system-wide error codes for other errors.

	*/	

	virtual TInt Read(TDes8& aDes, TInt aLength);

	/**

	Overload version of the RZipFileMemberReaderStream readL method.

	On return, contains the data read from the stream buffer.

	@param aDes The target descriptor for the data read from the stream buffer

	@param aLength The maximum number of bytes to be read

	@leave KErrNone If all bytes read successfully.

	@leave KErrCorrupt If reading fails.

	@leave KErrEof If end of file is reached.

	@leave ... Any one of the system-wide error codes for other errors.

	*/

	virtual void ReadL(TDes16& aDes, TInt aLength);

	void Release();

	void Close();

private:

	RZipFileMemberReaderStream(CZipFile&, TUint32, TUint32, TUint32, TUint32);

	static RZipFileMemberReaderStream* NewL(CZipFile&, TUint32, TUint32, TUint32, TUint32);

	void RZipFileMemberReaderStream::ConstructL();

	virtual TInt Read(void);

	virtual TInt Read(TByte*, TUint32, TUint32*);

	TInt GetBytes(TByte*, TUint32, TUint32*);

	TInt GetCompressedBytes(void);

	TInt GetStoredBytes(TByte*, TUint32, TUint32*);

	void ReadL(TDes8&);

	void ReadL(TDes16&);

	void ReadL(TDes8&, TChar);

	void ReadL(TDes16&, TChar);

	void ReadL(TUint8*, TInt);

	void ReadL(TUint16*, TInt);

	void ReadL(RWriteStream&);

	void ReadL(RWriteStream&, TInt);

	void ReadL(TInt);

	TInt8 ReadInt8L();

	TInt16 ReadInt16L();

	TInt32 ReadInt32L();

	TUint8 ReadUint8L();

	TUint16 ReadUint16L();

	TUint32 ReadUint32L();

	TReal32 ReadReal32L() __SOFTFP;

	TReal64 ReadReal64L() __SOFTFP;

	void PushL();

	void Pop();

	void Attach(MStreamBuf*);

	void Detach();

	MStreamBuf* Source();

private:

	enum

		{

		kCompressedBytesSize = 1024

		};

private:

	CZipFile& 	iZipFile;

	/** The method for compressing file*/ 

	TUint32   	iCompressionMethod;

	z_stream  	iStream;

	/** The size of compressed file */

	TUint32     iCompressedSize;

	/** The size of uncompressed file */

	TUint32     iUncompressedSize;

	TUint32     iFileOffset;

	TUint32     iOffset;

	TBool       iDone;

	/** The number of bytes already read in uncompressed bytes*/

	TUint32     iBytesLength;

	/** To store compressed bytes read*/

	TByte       iCompressedBytes[kCompressedBytesSize];

	/** Not used in implementation*/

	TUint32     iCompressedBytesOffset;

	};

#endif /* !_ZIP_FILE_MEMBER_INPUT_STREAM_H_ */