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// Copyright (c) 1995-2009 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 the License "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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// f32\sfile\sf_pgcompr.h
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//
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//
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#ifndef __SF_PGCOMPR_H__
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#define __SF_PGCOMPR_H__
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#include <e32base.h>
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#include<f32file.h>
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//#include "sf_std.h"
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#include <f32image.h>
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#include "sf_image.h"
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#include <e32uid.h>
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#include <e32rom.h>
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#include "sf_cache.h"
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const TUint KBytePairPageSize = 4096;
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// Buffer sized for at least 8 compressed pages - a noncompressible page is one byte larger
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const TUint KReadNumberOfPages = 8;
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const TUint KPagesBufferSize = (KBytePairPageSize + 1) * KReadNumberOfPages;
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typedef TUint8* (*TMemoryMoveFunction)(TAny* aTrg,const TAny* aSrc,TInt aLength);
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struct IndexTableHeader
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{
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TInt iSizeOfData; // Includes the index and compressed pages
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TInt iDecompressedSize;
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TUint16 iNumberOfPages;
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};
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// sizeof(IndexTableHeader) returns the wrong value due to rounding/padding, so calculate it
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const TUint KIndexTableHeaderSize = sizeof(TInt) + sizeof(TInt) + sizeof(TUint16);
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NONSHARABLE_CLASS(CBytePairReader) : public CBase
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{
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public:
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static CBytePairReader* NewLC(TUint8* aBuffer, TUint32 aLength);
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CBytePairReader(TUint8* aBuffer, TUint32 aLength);
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virtual TUint DecompressPagesL(TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn);
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void GetPageOffsetsL(TInt32 aInitialOffset, TInt& aPageCount, TInt32*& aPageStarts);
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TUint GetPageL(TUint aPageNum, TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn);
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virtual void SeekForwardL(TUint aBytes);
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protected:
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virtual void ReadInTableL();
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void ReleaseTable();
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IndexTableHeader iHeader;
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TUint16* iIndexTable;
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TUint8* iNextPage;
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TUint iBytesLeft;
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TUint8 iPageBuf[KBytePairPageSize];
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};
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NONSHARABLE_CLASS(CBytePairFileReader) : public CBytePairReader
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{
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public:
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static CBytePairFileReader* NewLC(RFile& aFile);
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CBytePairFileReader(RFile& aFile);
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~CBytePairFileReader();
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virtual TUint DecompressPagesL(TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMovefn);
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virtual void SeekForwardL(TUint aBytes);
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protected:
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virtual void ReadInTableL();
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RFile& iFile;
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TUint8 iBuffer[KPagesBufferSize];
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};
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#endif // __SF_PGCOMPR_H__
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