1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/lowlevellibsandfws/apputils/inc/BADICTIONARYCOMPRESSION.H	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,58 @@
     1.4 +// Copyright (c) 2001-2009 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 +//
    1.18 +
    1.19 +#if !defined(__E32STD_H__)
    1.20 +#include <e32std.h>
    1.21 +#endif
    1.22 +
    1.23 +#if !defined(__BADICTIONARYCOMPRESSION_H__)
    1.24 +#define __BADICTIONARYCOMPRESSION_H__
    1.25 +
    1.26 +#include "BaAssert.h"
    1.27 +
    1.28 +/**
    1.29 +This class implements a stream of bits (least significant bit first) as used by the code reading dictionary-compressed resource-files
    1.30 +@internalComponent
    1.31 +*/
    1.32 +class RDictionaryCompressionBitStream
    1.33 +	{
    1.34 +public:
    1.35 +	RDictionaryCompressionBitStream();
    1.36 +	void OpenL(
    1.37 +		TInt aNumberOfBitsUsedForDictionaryTokens,
    1.38 +		TInt aOffsetToFirstBit,
    1.39 +		TInt aOffsetOnePastLastBit,
    1.40 +		TBool aTransferringOwnershipOfBuffer,
    1.41 +		TUint8* aBuffer,
    1.42 +		const TBaAssert& aAssertObj);
    1.43 +	void Close();
    1.44 +	TBool EndOfStreamL() const;
    1.45 +	TInt IndexOfDictionaryEntryL(); // increments the current bit-position if it returns a value >=0; returns a negative value if the next thing in the stream is plain data rather than the index of a dictionary entry
    1.46 + 	void ReadL(TDes8& aBufferToAppendTo,TBool aCalypsoFileFormat); // can only be called if IndexOfDictionaryEntry returned a negative value
    1.47 +private:
    1.48 +	TBool CurrentBitIsOn() const; // does not increment the current bit-position
    1.49 +	TUint ReadIntegerL(TInt aNumberOfBits); // increments the current bit-position
    1.50 +private:
    1.51 +	TInt iNumberOfBitsUsedForDictionaryTokens;
    1.52 +	TInt iOffsetToFirstBit;
    1.53 +	TInt iOffsetToCurrentBit;
    1.54 +	TInt iOffsetOnePastLastBit;
    1.55 +	TBool iOwnsBitBuffer;
    1.56 +	TUint8* iBuffer;
    1.57 +	TBaAssert iAssertObj;
    1.58 +	};
    1.59 +
    1.60 +#endif
    1.61 +