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// Copyright (c) 2008-2009 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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#ifndef __SQLSRVBLOB_H__
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#define __SQLSRVBLOB_H__
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#include <s32buf.h>
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//Forward declarations
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struct sqlite3_blob;
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/**
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Stream buffer class with no intermediate buffering capabilities.
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The primary purpose of this class is:
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- to read/write from/to a blob column using sqlite3_blob_read()/sqlite3_blob_write() SQLite functions;
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- to serve as an IPC buffer for streaming the blob content from/to the client side dll;
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The class overrides the following virtual MStreamBuf functions:
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- DoRelease();
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- DoSynchL();
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- DoReadL();
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- DoWriteL();
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- DoSeekL();
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@internalComponent
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*/
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NONSHARABLE_CLASS(HBlobBuf) : public MStreamBuf
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{
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public:
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enum TMode
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{
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EReadOnly,
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EReadWrite
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};
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public:
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static HBlobBuf* NewL(sqlite3* aDb, const TDesC8& aDbName, const TDesC8& aTableName, const TDesC8& aColumnName, TInt64 aRowId, TMode aMode);
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private:
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HBlobBuf();
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void ConstructL(sqlite3* aDb, const TDesC8& aDbName, const TDesC8& aTableName, const TDesC8& aColumnName, TInt64 aRowId, TMode aMode);
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virtual void DoRelease();
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virtual void DoSynchL();
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virtual TInt DoReadL(TAny* aPtr, TInt aMaxLength);
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virtual void DoWriteL(const TAny* aPtr, TInt aLength);
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virtual TStreamPos DoSeekL(MStreamBuf::TMark aMark, TStreamLocation aLocation, TInt aOffset);
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sqlite3_blob* BlobHandleL();
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private:
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sqlite3_blob* iBlobHandle;
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TInt iBlobSize;
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TInt iWrPos;
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TInt iRdPos;
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};
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#endif//__SQLSRVBLOB_H__
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