e32tools/e32lib/e32image/deflate/deflate.h
author tnmurphy@4GBL06592.nokia.com
Sat, 21 Nov 2009 00:36:02 +0000
branchwip
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Parallel-parsing "noexport" flag.
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// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// e32tools\petran\Szip\deflate.h
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// 
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//
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#ifndef __DECODE_H__
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#define __DECODE_H__
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#include "huffman.h"
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#include <e32base.h>
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// deflation constants
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const TInt KDeflateLengthMag=8;
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const TInt KDeflateDistanceMag=12;
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//
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const TInt KDeflateMinLength=3;
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const TInt KDeflateMaxLength=KDeflateMinLength-1 + (1<<KDeflateLengthMag);
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const TInt KDeflateMaxDistance=(1<<KDeflateDistanceMag);
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const TInt KDeflateDistCodeBase=0x200;
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// hashing
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const TUint KDeflateHashMultiplier=0xAC4B9B19u;
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const TInt KDeflateHashShift=24;
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class TEncoding
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	{
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public:
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	enum {ELiterals=256,ELengths=(KDeflateLengthMag-1)*4,ESpecials=1,EDistances=(KDeflateDistanceMag-1)*4};
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	enum {ELitLens=ELiterals+ELengths+ESpecials};
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	enum {EEos=ELiterals+ELengths};
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public:
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	TUint32 iLitLen[ELitLens];
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	TUint32 iDistance[EDistances];
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	};
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const TInt KDeflationCodes=TEncoding::ELitLens+TEncoding::EDistances;
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class CInflater
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	{
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public:
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	enum {EBufSize = 0x800, ESafetyZone=8};
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public:
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	static CInflater* NewLC(TBitInput& aInput);
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	~CInflater();
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//
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	TInt ReadL(TUint8* aBuffer,TInt aLength);
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	TInt SkipL(TInt aLength);
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private:
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	CInflater(TBitInput& aInput);
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	void ConstructL();
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	void InitL();
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	TInt InflateL();
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private:
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	TBitInput* iBits;
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	const TUint8* iRptr;			// partial segment
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	TInt iLen;
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	const TUint8* iAvail;			// available data
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	const TUint8* iLimit;
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	TEncoding* iEncoding;
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	TUint8* iOut;					// circular buffer for distance matches
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	TUint8 iHuff[EBufSize+ESafetyZone];			// huffman data
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	};
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void DeflateL(const TUint8* aBuf, TInt aLength, TBitOutput& aOutput);
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#endif
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