1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/compressionlibs/ziplib/inc/ezdecompressor.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,98 @@
     1.4 +// Copyright (c) 1999-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +// Declaration for Decompression class
    1.18 +// 
    1.19 +//
    1.20 +
    1.21 +#ifndef __EZDECOMPRESSOR_H__
    1.22 +#define __EZDECOMPRESSOR_H__
    1.23 +
    1.24 +#include <e32base.h>
    1.25 +#include <ezstream.h>
    1.26 +#include <ezbufman.h>
    1.27 +
    1.28 +/**
    1.29 +The CEZDecompressor class provides in-memory de-compression functions, including integrity checks of the compressed data.
    1.30 +This version of the library supports only one compression / de-compression method (deflation / inflation).  De-compression
    1.31 +can be done in a single step (using DecompressL()) if the buffers are large enough (for example if an input file is mmap'ed),
    1.32 +or can be done by repeated calls of the InflateL() function.  The source data is de-compressed to the target buffer (both source 
    1.33 +and target contained within the buffer manager argument).
    1.34 +
    1.35 +Note: In this version of the library a windowBits value of 8 is unsupported due to a problem with the window size being 
    1.36 +set to 256 bytes. Although a value of 8 will be accepted by the CEZCompressor constructors, as it is being changed 
    1.37 +internally by Zlib from 8 to 9, it will not be possible to use the same value for decompression. This is because the 
    1.38 +Zlib functions called by the CEZDecompressor constructors do not make the same change internally and as a result a 
    1.39 +KEZlibErrData is returned when calling InflateL(). It is therefore advised that for this version of the library 
    1.40 +windowBits of 9 is used in place of 8.
    1.41 +
    1.42 +@publishedAll
    1.43 +@released
    1.44 +*/
    1.45 +class CEZDecompressor : public CEZZStream
    1.46 +	{
    1.47 +public:
    1.48 +	/** Decompression panic values */
    1.49 +	enum 
    1.50 +		{
    1.51 +		EInflateInitlialiserError = EUnexpected + 1,
    1.52 +		EInflateVersionError,
    1.53 +		EInflateTerminated,
    1.54 +		EInflateDictionaryError
    1.55 +		};
    1.56 +		
    1.57 +	/** Window Bits - the base two logarithm of the window size (the size of the history buffer) */
    1.58 +	enum
    1.59 +		{
    1.60 +		EMaxWBits = MAX_WBITS
    1.61 +		};
    1.62 +
    1.63 +public:
    1.64 +	~CEZDecompressor();
    1.65 +
    1.66 +	IMPORT_C static CEZDecompressor* NewLC(MEZBufferManager& aInit, TInt aWindowBits = EMaxWBits);
    1.67 +	IMPORT_C static CEZDecompressor* NewL(MEZBufferManager& aInit, TInt aWindowBits = EMaxWBits);
    1.68 +
    1.69 +	IMPORT_C static CEZDecompressor* NewLC(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits = EMaxWBits);
    1.70 +	IMPORT_C static CEZDecompressor* NewL(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits = EMaxWBits);
    1.71 +
    1.72 +
    1.73 +	IMPORT_C void ResetL(MEZBufferManager& aInit);
    1.74 +	IMPORT_C TBool InflateL();
    1.75 +
    1.76 +	IMPORT_C static void DecompressL(TDes8 &aDestination, const TDesC8 &aSource);
    1.77 +	
    1.78 +	private:
    1.79 +		enum TInflationState
    1.80 +			{
    1.81 +			ENoFlush,
    1.82 +			EFinalize,
    1.83 +			ETerminated
    1.84 +			};
    1.85 +
    1.86 +	private:
    1.87 +		void SetDictionaryL();
    1.88 +		CEZDecompressor(MEZBufferManager* aInit);
    1.89 +		CEZDecompressor(MEZBufferManager* aInit, const TUint8 *aDictionary, TInt aLength);
    1.90 +		void ConstructL(TInt aWindowBits);
    1.91 +
    1.92 +	private:
    1.93 +		MEZBufferManager* iBufferInit;
    1.94 +		TInflationState iInflationState;
    1.95 +		const TUint8* iDictionary;
    1.96 +		TInt iDictionaryLength;
    1.97 +	};
    1.98 +
    1.99 +#endif
   1.100 +
   1.101 +