/*

* Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* e32tools\petran\Szip\deflate.h

*

*/

#ifndef __DECODE_H__

#define __DECODE_H__

#include "huffman.h"

#include <e32base.h>

// deflation constants

const TInt KDeflateLengthMag=8;

const TInt KDeflateDistanceMag=12;

//

const TInt KDeflateMinLength=3;

const TInt KDeflateMaxLength=KDeflateMinLength-1 + (1<<KDeflateLengthMag);

const TInt KDeflateMaxDistance=(1<<KDeflateDistanceMag);

const TInt KDeflateDistCodeBase=0x200;

// hashing

const TUint KDeflateHashMultiplier=0xAC4B9B19u;

const TInt KDeflateHashShift=24;

class TEncoding

	{

public:

	enum {ELiterals=256,ELengths=(KDeflateLengthMag-1)*4,ESpecials=1,EDistances=(KDeflateDistanceMag-1)*4};

	enum {ELitLens=ELiterals+ELengths+ESpecials};

	enum {EEos=ELiterals+ELengths};

public:

	TUint32 iLitLen[ELitLens];

	TUint32 iDistance[EDistances];

	};

const TInt KDeflationCodes=TEncoding::ELitLens+TEncoding::EDistances;

class CInflater

	{

public:

	enum {EBufSize = 0x800, ESafetyZone=8};

public:

	static CInflater* NewLC(TBitInput& aInput);

	~CInflater();

//

	TInt ReadL(TUint8* aBuffer,TInt aLength);

	TInt SkipL(TInt aLength);

private:

	CInflater(TBitInput& aInput);

	void ConstructL();

	void InitL();

	TInt InflateL();

private:

	TBitInput* iBits;

	const TUint8* iRptr;			// partial segment

	TInt iLen;

	const TUint8* iAvail;			// available data

	const TUint8* iLimit;

	TEncoding* iEncoding;

	TUint8* iOut;					// circular buffer for distance matches

	TUint8 iHuff[EBufSize+ESafetyZone];			// huffman data

	};

void DeflateL(const TUint8* aBuf, TInt aLength, TBitOutput& aOutput);

#endif