// 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