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

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of the License "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // f32\sfile\sf_deflate.h

    15 // 

    16 //

    17 

    18 #ifndef __SF_DEFLATE_H__

    19 #define __SF_DEFLATE_H__

    20 #include "e32huffman.h"

    21 #include <e32base.h>

    22 #include <f32file.h>

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

    24 

    25 #define __CONFIGURABLE_F32_LOADER_INFLATE_WINDOW_SIZE__ 0x8000

    26 

    27 // deflation constants

    28 const TInt KDeflateLengthMag=8;

    29 const TInt KDeflateDistanceMag=12;

    30 //

    31 const TInt KDeflateMinLength=3;

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

    33 const TInt KDeflateMaxDistance=(1<<KDeflateDistanceMag);

    34 const TInt KDeflateDistCodeBase=0x200;

    35 // hashing

    36 const TUint KDeflateHashMultiplier=0xAC4B9B19u;

    37 const TInt KDeflateHashShift=24;

    38 // inflate

    39 const TInt KInflateWindowSize=__CONFIGURABLE_F32_LOADER_INFLATE_WINDOW_SIZE__ ;

    40 

    41 class TEncoding

    42 	{

    43 public:

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

    45 	enum {ELitLens=ELiterals+ELengths+ESpecials};

    46 	enum {EEos=ELiterals+ELengths};

    47 public:

    48 	TUint32 iLitLen[ELitLens];

    49 	TUint32 iDistance[EDistances];

    50 	};

    51 

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

    53 

    54 NONSHARABLE_CLASS(CInflater) : public CBase

    55 	{

    56 public:

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

    58 public:

    59 	static CInflater* NewLC(TBitInput& aInput);

    60 	~CInflater();

    61 //

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

    63 	TInt SkipL(TInt aLength);

    64 private:

    65 	CInflater(TBitInput& aInput);

    66 	void ConstructL();

    67 	void InitL();

    68 	TInt InflateL();

    69 private:

    70 	TBitInput* iBits;

    71 	const TUint8* iRptr;			// partial segment

    72 	TInt iLen;

    73 	const TUint8* iAvail;			// available data

    74 	const TUint8* iLimit;

    75 	TEncoding* iEncoding;

    76 	TUint8* iOut;					// circular buffer for distance matches

    77 	};

    78 

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

    80 

    81 NONSHARABLE_CLASS(TFileInput) : public TBitInput

    82 	{

    83  	enum {KBufSize=KInflateWindowSize};

    84 public:

    85 	TFileInput(RFile& aFile);

    86 	void Cancel();

    87 private:

    88 	void UnderflowL();

    89 private:

    90 	RFile& iFile;

    91 	TRequestStatus iStat;

    92 	TUint8* iReadBuf;

    93 	TPtr8 iPtr;

    94 	TUint8 iBuf1[KBufSize];

    95 	TUint8 iBuf2[KBufSize];

    96 	};

    97 

    98 #endif