--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/sfile/sf_deflate.h	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,98 @@
+// 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