/*

* Copyright (c) 2003 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:  ?Description

*

*/

#ifndef __DECMPSTREAM_H_

#define __DECMPSTREAM_H_

//------------------------------------------------------------------------------

//------------------------------------------------------------------------------

class EZDecompressor;

class StreamBufMgr;

class RMemReadStream;

//------------------------------------------------------------------------------

class TZlibHeader

{

public:

	// ctor & dtor

	TZlibHeader() : iCMF( 0 ), iFLG( 0 )				{}

	~TZlibHeader()										{}

	//----------------------------------------------------------------------

	// data

	TUint8 iCMF;

	TUint8 iFLG;

	//----------------------------------------------------------------------

};

class CDecmpStream : public CBase

{

public:

	enum { EGzip=0, EZlib=1 };

	enum { EBadZlibHeader = -1,EDictionaryNotSupported = -2 };

	//--------------------------------------------------------------------------

	// dtor & ctor

	static CDecmpStream* NewL( TPtrC8 in, TInt format = EGzip );

	virtual ~CDecmpStream();

	//--------------------------------------------------------------------------

	// inflate the content

	TBool InflateL();

	TPtrC8 GetOutput();

	void ResetBuffer( TPtrC8 in );

	TBool NeedInput() const;

	TBool NeedOutput() const;

	TBool Finalized() const;

	void ResetOutput();

	//--------------------------------------------------------------------------

private:

	// ctor

	CDecmpStream( TInt format );

	void ConstructL( TPtrC8 in );

	//--------------------------------------------------------------------------

	// helper functions

	void ReadHeaderL( TEZGZipHeader& header );

	TBool ReadHeaderL( TZlibHeader& header );

	void ReadTrailerL( TEZGZipTrailer& trailer );

	void ReadStringIntoDescriptorL( RMemReadStream& aMem, HBufC8 **aDes ) const;

	//--------------------------------------------------------------------------

	CEZDecompressor* iDecompressor;

	StreamBufMgr* iBufMgr;

	TInt			iOffset;

	HBufC8*			iAuxBuf;		// auxillary buffer, used for the wrong deflate implmentation

	TUint32			iCheckSum;		// CRC or Adler

	TInt			iFormat;

	//--------------------------------------------------------------------------

	// Gzip Magic numbers

	static const TUint8 ID1;

	static const TUint8 ID2;

	//--------------------------------------------------------------------------

};

//------------------------------------------------------------------------------

#endif // !__DECMPSTREAM_H_