sl@0: // Copyright (c) 1999-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // EZLib: DECOMPRESSOR.H
sl@0: // Declaration for Decompression class
sl@0: // 
sl@0: //
sl@0: 
sl@0: #ifndef __EZLIB_EZDECOMPRESSOR_H__
sl@0: #define __EZLIB_EZDECOMPRESSOR_H__
sl@0: 
sl@0: #include <e32base.h>
sl@0: #include "OldEZstream.h"
sl@0: #include "OldEZBufman.h"
sl@0: 
sl@0: /**
sl@0: The CEZDecompressor class provides in-memory de-compression functions, including integrity checks of the compressed data.
sl@0: This version of the library supports only one compression / de-compression method (deflation / inflation).  De-compression
sl@0: can be done in a single step (using DecompressL()) if the buffers are large enough (for example if an input file is mmap'ed),
sl@0: or can be done by repeated calls of the InflateL() function.  The source data is de-compressed to the target buffer (both source 
sl@0: and target contained within the buffer manager argument).
sl@0: 
sl@0: @publishedAll
sl@0: @released
sl@0: */
sl@0: namespace TOLDEZLIB
sl@0: {
sl@0: 	
sl@0: class CEZDecompressor : public CEZZStream
sl@0: 	{
sl@0: public:
sl@0: 	/** Decompression panic values */
sl@0: 	enum 
sl@0: 		{
sl@0: 		EInflateInitlialiserError = EUnexpected + 1,
sl@0: 		EInflateVersionError,
sl@0: 		EInflateTerminated,
sl@0: 		EInflateDictionaryError
sl@0: 		};
sl@0: 		
sl@0: 	/** Window Bits - the base two logarithm of the window size (the size of the history buffer) */
sl@0: 	enum
sl@0: 		{
sl@0: 		EMaxWBits = MAX_WBITS
sl@0: 		};
sl@0: 
sl@0: public:
sl@0: 	~CEZDecompressor();
sl@0: 
sl@0: 	IMPORT_C static CEZDecompressor* NewLC(MEZBufferManager& aInit, TInt aWindowBits = EMaxWBits);
sl@0: 	IMPORT_C static CEZDecompressor* NewL(MEZBufferManager& aInit, TInt aWindowBits = EMaxWBits);
sl@0: 
sl@0: 	IMPORT_C static CEZDecompressor* NewLC(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits = EMaxWBits);
sl@0: 	IMPORT_C static CEZDecompressor* NewL(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits = EMaxWBits);
sl@0: 
sl@0: 
sl@0: 	IMPORT_C void ResetL(MEZBufferManager& aInit);
sl@0: 	IMPORT_C TBool InflateL();
sl@0: 
sl@0: 	IMPORT_C static void DecompressL(TDes8 &aDestination, const TDesC8 &aSource);
sl@0: 
sl@0: 	private:
sl@0: 		enum TInflationState
sl@0: 			{
sl@0: 			ENoFlush,
sl@0: 			EFinalize,
sl@0: 			ETerminated
sl@0: 			};
sl@0: 
sl@0: 	private:
sl@0: 		void SetDictionaryL();
sl@0: 		CEZDecompressor(MEZBufferManager* aInit);
sl@0: 		CEZDecompressor(MEZBufferManager* aInit, const TUint8 *aDictionary, TInt aLength);
sl@0: 		void ConstructL(TInt aWindowBits);
sl@0: 
sl@0: 	private:
sl@0: 		MEZBufferManager* iBufferInit;
sl@0: 		TInflationState iInflationState;
sl@0: 		const TUint8* iDictionary;
sl@0: 		TInt iDictionaryLength;
sl@0: 	};
sl@0: 
sl@0: } //namespace TOLDEZLIB
sl@0: #endif
sl@0: 
sl@0: