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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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//
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#if !defined(__S32HUF_H__)
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#define __S32HUF_H__
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#if !defined(__S32BUF_H__)
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#include <s32buf.h>
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#endif
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#if !defined(__S32STRM_H__)
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#include <s32strm.h>
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#endif
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class Huffman // Huffman primitives: sell to base
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{
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public:
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IMPORT_C static const TUint* DefaultBits(); // long code needs to be sorted out
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IMPORT_C static const TUint8* DefaultTree(); // is there a real case for default tables?
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//
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IMPORT_C void Encode(...); // incremental encoding and decoding primitives
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IMPORT_C void Decode(...); // suitable for sharing between descriptors and filters
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};
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//
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class THufEncodeFilter : public TStreamFilter
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{
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public:
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IMPORT_C THufEncodeFilter();
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IMPORT_C void Set(MStreamBuf* aHost,const TUint* aHufBits,TInt aMode=EWrite);
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protected:
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IMPORT_C TInt Capacity(TInt aMaxLength);
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IMPORT_C TInt FilterL(TAny* aPtr,TInt aMaxLength,const TUint8*& aFrom,const TUint8* anEnd);
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IMPORT_C void DoSynchL();
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private:
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const TUint* iTable;
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TInt iMaxBits;
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TUint iOut;
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TInt iBit;
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};
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class THufDecodeFilter : public TStreamFilter
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{
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public:
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IMPORT_C THufDecodeFilter();
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IMPORT_C void Set(MStreamBuf* aHost,const TUint8* aHufTree,TInt aMode=ERead);
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protected:
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IMPORT_C TInt Capacity(TInt aMaxLength);
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IMPORT_C TInt FilterL(TAny* aPtr,TInt aMaxLength,const TUint8*& aFrom,const TUint8* anEnd);
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IMPORT_C void DoSynchL();
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private:
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const TUint8* iRoot;
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const TUint8* iNode;
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TUint iBits;
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};
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//
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class RHufDecodeReadStream : public RReadStream
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{
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public:
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RHufDecodeReadStream() {}
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IMPORT_C RHufDecodeReadStream(RReadStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
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IMPORT_C void Open(RReadStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
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private:
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THufDecodeFilter iFilter;
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};
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class RHufEncodeWriteStream : public RWriteStream
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{
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public:
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RHufEncodeWriteStream() {}
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inline RHufEncodeWriteStream(const MExternalizer<TStreamRef>& anExter);
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IMPORT_C RHufEncodeWriteStream(RWriteStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
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IMPORT_C void Open(RWriteStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
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private:
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THufEncodeFilter iFilter;
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};
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//
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class RHufEncodeReadStream : public RReadStream
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{
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public:
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RHufEncodeReadStream() {}
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IMPORT_C RHufEncodeReadStream(RReadStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
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IMPORT_C void Open(RReadStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
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private:
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THufEncodeFilter iFilter;
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};
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class RHufDecodeWriteStream : public RWriteStream
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{
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public:
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RHufDecodeWriteStream() {}
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inline RHufDecodeWriteStream(const MExternalizer<TStreamRef>& anExter);
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IMPORT_C RHufDecodeWriteStream(RWriteStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
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IMPORT_C void Open(RWriteStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
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private:
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THufDecodeFilter iFilter;
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};
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#include "S32HUF.INL"
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#endif
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