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// Copyright (c) 1999-2009 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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// EZLib: COMPRESSOR.H
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// Declaration for Compression class
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//
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//
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#ifndef __EZLIB_EZCOMPRESSOR_H__
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#define __EZLIB_EZCOMPRESSOR_H__
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#include <e32base.h>
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#include "OldEZstream.h"
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#include "OldEZBufman.h"
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/**
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The CEZCompressor class provides in-memory compression functions, including integrity checks of the uncompressed data.
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This version of the library supports only one compression method (deflation). Compression can be done in a single step
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(using CompressL()) if the buffers are large enough (for example if an input file is mmap'ed), or can be done by repeated calls
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of the DeflateL() function. The source data is compressed to the target buffer (both source and target contained within
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the buffer manager argument), and various other arguments distinguish the different compression settings.
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@publishedAll
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@released
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*/
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namespace TOLDEZLIB
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{
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class CEZCompressor : public CEZZStream
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{
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public:
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/** Compression strategy - used to tune the compression algorithm */
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enum TStrategy
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{
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/** Use for normal data */
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EDefaultStrategy = Z_DEFAULT_STRATEGY,
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/** Force Huffman encoding only (no string match) */
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EFiltered = Z_FILTERED,
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/** Use for data produced by a filter (or predictor) */
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EHuffmanOnly = Z_HUFFMAN_ONLY
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};
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/** Compression levels */
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enum
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{
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EDefaultCompression = Z_DEFAULT_COMPRESSION,
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ENoCompression = Z_NO_COMPRESSION,
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EBestSpeed = Z_BEST_SPEED,
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EBestCompression = Z_BEST_COMPRESSION
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};
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/** Window Bits - the base two logarithm of the window size (the size of the history buffer) */
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enum
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{
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EMaxWBits = MAX_WBITS
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};
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/** Memory level - specifies how much memory should be allocated for the internal compression state */
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enum
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{
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EDefMemLevel = MAX_MEM_LEVEL
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};
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/** Compression panic values */
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enum
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{
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EDeflateInitlialiserError = EUnexpected + 1,
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EDeflateTerminated
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};
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public:
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~CEZCompressor();
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IMPORT_C static CEZCompressor* NewLC(MEZBufferManager& aInit, TInt aLevel = EDefaultCompression,
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TInt aWindowBits = EMaxWBits, TInt aMemLevel = EDefMemLevel, TStrategy aStrategy = EDefaultStrategy);
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IMPORT_C static CEZCompressor* NewL(MEZBufferManager& aInit, TInt aLevel = EDefaultCompression,
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TInt aWindowBits = EMaxWBits, TInt aMemLevel = EDefMemLevel, TStrategy aStrategy = EDefaultStrategy);
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IMPORT_C static CEZCompressor* NewLC(MEZBufferManager& aInit, const TDesC8 &aDictionary,
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TInt aLevel = EDefaultCompression, TInt aWindowBits = EMaxWBits, TInt aMemLevel = EDefMemLevel,
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TStrategy aStrategy = EDefaultStrategy);
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IMPORT_C static CEZCompressor* NewL(MEZBufferManager& aInit, const TDesC8 &aDictionary,
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TInt aLevel = EDefaultCompression, TInt aWindowBits = EMaxWBits, TInt aMemLevel = EDefMemLevel,
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TStrategy aStrategy = EDefaultStrategy);
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IMPORT_C void ResetL(MEZBufferManager& aInit);
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IMPORT_C TBool DeflateL();
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IMPORT_C static void CompressL(TDes8 &aDestination, const TDesC8 &aSource, TInt aLevel = EDefaultCompression);
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private:
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enum TDeflationState
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{
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ENoFlush,
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EFinish,
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EFinalize,
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ETerminated
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};
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private:
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CEZCompressor(MEZBufferManager* aInit);
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void ConstructL(TInt aLevel, const TUint8* aDictionary, TInt aLength, TInt aWindowBits, TInt aMemLevel, TStrategy aStrategy);
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void ConstructL(TInt aLevel, TInt aWindowBits, TInt aMemLevel, TStrategy aStrategy);
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private:
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MEZBufferManager* iBufferInit;
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TDeflationState iDeflationState;
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};
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} //namespace TOLDEZLIB
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#endif
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