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// Copyright (c) 2001-2009 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(__E32STD_H__)
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#include <e32std.h>
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#endif
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#if !defined(__BADICTIONARYCOMPRESSION_H__)
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#define __BADICTIONARYCOMPRESSION_H__
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#include "BaAssert.h"
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/**
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This class implements a stream of bits (least significant bit first) as used by the code reading dictionary-compressed resource-files
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@internalComponent
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*/
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class RDictionaryCompressionBitStream
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{
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public:
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RDictionaryCompressionBitStream();
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void OpenL(
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TInt aNumberOfBitsUsedForDictionaryTokens,
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TInt aOffsetToFirstBit,
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TInt aOffsetOnePastLastBit,
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TBool aTransferringOwnershipOfBuffer,
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TUint8* aBuffer,
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const TBaAssert& aAssertObj);
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void Close();
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TBool EndOfStreamL() const;
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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
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void ReadL(TDes8& aBufferToAppendTo,TBool aCalypsoFileFormat); // can only be called if IndexOfDictionaryEntry returned a negative value
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private:
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TBool CurrentBitIsOn() const; // does not increment the current bit-position
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TUint ReadIntegerL(TInt aNumberOfBits); // increments the current bit-position
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private:
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TInt iNumberOfBitsUsedForDictionaryTokens;
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TInt iOffsetToFirstBit;
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TInt iOffsetToCurrentBit;
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TInt iOffsetOnePastLastBit;
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TBool iOwnsBitBuffer;
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TUint8* iBuffer;
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TBaAssert iAssertObj;
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};
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#endif
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