kerneltest/f32test/ext/t_bitext.cpp
author John Imhofe
Mon, 19 Oct 2009 15:55:17 +0100
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permissions -rw-r--r--
Convert Kernelhwsrv package from SFL to EPL kernel\eka\compsupp is subject to the ARM EABI LICENSE userlibandfileserver\fatfilenameconversionplugins\unicodeTables is subject to the Unicode license kernel\eka\kernel\zlib is subject to the zlib license
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// Copyright (c) 2002-2009 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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// f32test\ext\bitext.cpp
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// extension to do XOR on every byte on 32 byte boundary read or written to media subsystem in same thread
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// therefore RFile::Read/Write does not have this operation carried out on it
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// 
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//
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#include <f32fsys.h>
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class CBitExtProxyDrive : public CBaseExtProxyDrive
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	{
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public:
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	static CBitExtProxyDrive* NewL(CProxyDrive* aProxyDrive, CMountCB* aMount);
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	~CBitExtProxyDrive();
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public:
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	virtual TInt Initialise();
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	virtual TInt Dismounted();
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	virtual TInt Enlarge(TInt aLength);
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	virtual TInt ReduceSize(TInt aPos, TInt aLength);
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	virtual TInt Read(TInt64 aPos,TInt aLength,const TAny* aTrg,TInt aThreadHandle,TInt anOffset);
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	virtual TInt Read(TInt64 aPos,TInt aLength,TDes8& aTrg);
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	virtual TInt Write(TInt64 aPos,TInt aLength,const TAny* aSrc,TInt aThreadHandle,TInt anOffset);
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	virtual TInt Write(TInt64 aPos,const TDesC8& aSrc);
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	virtual TInt Format(TFormatInfo& anInfo);
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	virtual TInt GetInterface(TInt aInterfaceId,TAny*& aInterface,TAny* aInput);
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private:
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	CBitExtProxyDrive(CProxyDrive* aProxyDrive, CMountCB* aMount);
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private:
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	TInt iReadThread;
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	TInt iRead;
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	TInt iWriteThread;
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	TInt iWrite;
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	TInt iFormat;
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	};
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class CBitProxyDriveFactory : public CProxyDriveFactory
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	{
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public:
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	CBitProxyDriveFactory();
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	virtual TInt Install();			
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	virtual CProxyDrive* NewProxyDriveL(CProxyDrive* aProxy,CMountCB* aMount);
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	};
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const TUint8 KBitMask=0xcc;
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const TInt KChangePosMask=0x0000001f;
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LOCAL_C void DoXOR(TInt aPos,TInt aLength,TUint8* aPtr)
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//
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//
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//
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	{
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	for(TInt i=0;i<aLength;++i)
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		{
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		if(((i+aPos)&KChangePosMask)==0)
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			aPtr[i]^=KBitMask;
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		}
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	}
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CBitExtProxyDrive* CBitExtProxyDrive::NewL(CProxyDrive* aProxyDrive, CMountCB* aMount)
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//
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//
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//
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	{
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	CBitExtProxyDrive* temp=new(ELeave) CBitExtProxyDrive(aProxyDrive,aMount);
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	return(temp);
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	}
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CBitExtProxyDrive::CBitExtProxyDrive(CProxyDrive* aProxyDrive, CMountCB* aMount):CBaseExtProxyDrive(aProxyDrive,aMount)
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	{
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	RDebug::Print(_L("CBitExtProxyDrive::CBitExtProxyDrive"));
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	}
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CBitExtProxyDrive::~CBitExtProxyDrive()
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//
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//
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//
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	{
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	RDebug::Print(_L("Read Thread = %d"),iReadThread);
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	RDebug::Print(_L("Read = %d"),iRead);
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	RDebug::Print(_L("Write Thread = %d"),iWriteThread);
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	RDebug::Print(_L("Write = %d"),iWrite);
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	RDebug::Print(_L("Format = %d"),iFormat);
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	}
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TInt CBitExtProxyDrive::Initialise()
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//
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//
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	{
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	return(CBaseExtProxyDrive::Initialise());
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	}
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TInt CBitExtProxyDrive::Dismounted()
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//
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	{
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	return(CBaseExtProxyDrive::Dismounted());
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	}
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TInt CBitExtProxyDrive::Enlarge(TInt aLength)
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//
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	{
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	return(CBaseExtProxyDrive::Enlarge(aLength));
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	}
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TInt CBitExtProxyDrive::ReduceSize(TInt aPos, TInt aLength)
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//
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	{
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	return(CBaseExtProxyDrive::ReduceSize(aPos,aLength));
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	}
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TInt CBitExtProxyDrive::Read(TInt64 aPos,TInt aLength,const TAny* aTrg,TInt aThreadHandle,TInt anOffset)
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//
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	{
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	++iReadThread;
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	return(CBaseExtProxyDrive::Read(aPos,aLength,aTrg,aThreadHandle,anOffset));
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	}
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TInt CBitExtProxyDrive::Read(TInt64 aPos,TInt aLength,TDes8& aTrg)
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//
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	{
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	++iRead;
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	TInt r=CBaseExtProxyDrive::Read(aPos,aLength,aTrg);
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	DoXOR(I64INT(aPos),aLength,&aTrg[0]);
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	return(r);
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	}
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TInt CBitExtProxyDrive::Write(TInt64 aPos,TInt aLength,const TAny* aSrc,TInt aThreadHandle,TInt anOffset)
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//
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	{
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	++iWriteThread;
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	return(CBaseExtProxyDrive::Write(aPos,aLength,aSrc,aThreadHandle,anOffset));
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	}
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TInt CBitExtProxyDrive::Write(TInt64 aPos,const TDesC8& aSrc)
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//
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//
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//
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	{
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	++iWrite;
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	// data may be read-only, so need to copy to a local buffer
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	// before XOR-ing...
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	HBufC8* buf = HBufC8::New( aSrc.Length() );
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	if( !buf )
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		return KErrNoMemory;
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	TPtr8 ptr = buf->Des();
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	ptr.Copy(aSrc);
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	DoXOR(I64INT(aPos), ptr.Length(), (TUint8*)ptr.Ptr());
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	TInt r = CBaseExtProxyDrive::Write(aPos, ptr);
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	delete buf;
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	return(r);
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	}
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TInt CBitExtProxyDrive::Format(TFormatInfo& anInfo)
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//
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//
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//
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	{
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	++iFormat;
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	return(CBaseExtProxyDrive::Format(anInfo));
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	}
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TInt CBitExtProxyDrive::GetInterface(TInt aInterfaceId,TAny*& aInterface,TAny* aInput)
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	{
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	switch(aInterfaceId)
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		{
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		// file caching supported, so pass query on to next extension
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		case ELocalBufferSupport:
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			return CBaseExtProxyDrive::LocalBufferSupport();
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		default:
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			return CBaseExtProxyDrive::GetInterface(aInterfaceId, aInterface, aInput);
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		}
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	}
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CBitProxyDriveFactory::CBitProxyDriveFactory()
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//
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//
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//
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	{
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	RDebug::Print(_L("CBitProxyDriveFactory::CBitProxyDriveFactory"));
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	}
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TInt CBitProxyDriveFactory::Install()
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//
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//
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//
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	{
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	_LIT(KBitName,"Bitchange");
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	return(SetName(&KBitName));
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	}
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CProxyDrive* CBitProxyDriveFactory::NewProxyDriveL(CProxyDrive* aProxy,CMountCB* aMount)
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//
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//
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//
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	{
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	return(CBitExtProxyDrive::NewL(aProxy,aMount));
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	}
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extern "C" {
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EXPORT_C CProxyDriveFactory* CreateFileSystem()
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//
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// Create a new file system
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//
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	{
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	return(new CBitProxyDriveFactory());
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	}
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}
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