// 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:

// f32\sfile\sf_deflate.h

// 

//

#ifndef __SF_DEFLATE_H__

#define __SF_DEFLATE_H__

#include "e32huffman.h"

#include <e32base.h>

#include <f32file.h>

typedef TUint8* (*TMemoryMoveFunction)(TAny* aTrg,const TAny* aSrc,TInt aLength);

#define __CONFIGURABLE_F32_LOADER_INFLATE_WINDOW_SIZE__ 0x8000

// 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;

// inflate

const TInt KInflateWindowSize=__CONFIGURABLE_F32_LOADER_INFLATE_WINDOW_SIZE__ ;

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;

NONSHARABLE_CLASS(CInflater) : public CBase

	{

public:

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

public:

	static CInflater* NewLC(TBitInput& aInput);

	~CInflater();

//

	TInt ReadL(TUint8* aBuffer,TInt aLength, TMemoryMoveFunction aMemMovefn);

	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

	};

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

NONSHARABLE_CLASS(TFileInput) : public TBitInput

	{

 	enum {KBufSize=KInflateWindowSize};

public:

	TFileInput(RFile& aFile);

	void Cancel();

private:

	void UnderflowL();

private:

	RFile& iFile;

	TRequestStatus iStat;

	TUint8* iReadBuf;

	TPtr8 iPtr;

	TUint8 iBuf1[KBufSize];

	TUint8 iBuf2[KBufSize];

	};

#endif