diff -r 2f92ad2dc5db -r 1df514389a47 kernel/eka/drivers/usbho/usbdi_utils/zerocopytransferstrategy.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/drivers/usbho/usbdi_utils/zerocopytransferstrategy.h	Wed Apr 14 17:22:59 2010 +0300
@@ -0,0 +1,112 @@
+// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+/**
+ @file
+ @internalComponent
+*/
+
+#ifndef ZEROCOPYTRANSFERSTRATEGY_H
+#define ZEROCOPYTRANSFERSTRATEGY_H
+
+#include "usbtransferstrategy.h"
+
+
+NONSHARABLE_CLASS(RUsbZeroCopyTransferStrategy) : public RUsbTransferStrategy
+	{
+public:
+	RUsbZeroCopyTransferStrategy();
+	virtual TInt RegisterTransferDescriptor(RUsbTransferDescriptor& aTransferDesc, TInt aRequiredSize, TUint aStartAlignment, TInt aRequiredMaxPackets);
+	virtual void ResetTransferDescriptors();
+	virtual TInt InitialiseTransferDescriptors(RUsbInterface& aInterface);
+
+	virtual void Close();
+
+public: // Interrupt transfer descriptor methods
+	virtual TPtr8	IntrWritableBuffer(TInt aHandle);
+	virtual void	IntrSaveData(TInt aHandle, TInt aLength);
+	virtual void	IntrSetZlpStatus(TInt aHandle, RUsbTransferDescriptor::TZlpStatus aZlpStatus);
+	virtual TPtrC8	IntrBuffer(TInt aHandle) const;
+public: // Bulk transfer descriptor methods
+	virtual TPtr8	BulkWritableBuffer(TInt aHandle);
+	virtual void	BulkSaveData(TInt aHandle, TInt aLength);
+	virtual void	BulkSetZlpStatus(TInt aHandle, RUsbTransferDescriptor::TZlpStatus aZlpStatus);
+	virtual TPtrC8	BulkBuffer(TInt aHandle) const;
+public: // Isochronous transfer descriptor methods
+	virtual void	IsocReset(TInt aHandle);
+	virtual TPacketLengths IsocLengths(TInt aHandle);
+	virtual TPacketResults IsocResults(TInt aHandle);
+	virtual TInt	IsocMaxPacketSize(TInt aHandle);
+	virtual TPtr8	IsocWritablePackets(TInt aHandle, TInt aWriteHandle, TInt aNumPacketsRequested, TInt& aMaxNumPacketsAbleToWrite);
+	virtual TInt	IsocSaveMultiple(TInt aHandle, TInt aWriteHandle, TInt aNumOfPackets);
+	virtual TPtrC8	IsocPackets(TInt aHandle, TInt aFirstPacketIndex, TInt aNumPacketsRequested, TInt& aNumPacketsReturned) const;
+	virtual void	IsocReceivePackets(TInt aHandle, TInt aNumOfPackets);
+
+
+private: // Standard (Bulk, Ctrl and Intr) Buffer methods
+	TPtr8	WritableBuffer(TInt aHandle);
+	void	SaveData(TInt aHandle, TInt aLength);
+	void	SetZlpStatus(TInt aHandle, RUsbTransferDescriptor::TZlpStatus aZlpStatus);
+	TPtrC8	Buffer(TInt aHandle) const;
+
+private: // Isoc Buffer methods
+	void	Reset(TInt aHandle);
+	TPacketLengths Lengths(TInt aHandle);
+	TPacketResults Results(TInt aHandle);
+	TInt	MaxPacketSize(TInt aHandle);
+	TPtr8	WritablePackets(TInt aHandle, TInt aWriteHandle, TInt aNumPacketsRequested, TInt& aMaxNumPacketsAbleToWrite);
+	TInt	SaveMultiple(TInt aHandle, TInt aWriteHandle, TInt aNumOfPackets);
+	TPtrC8	Packets(TInt aHandle, TInt aFirstPacketIndex, TInt aNumPacketsRequested, TInt& aNumPacketsReturned) const;
+	void	ReceivePackets(TInt aHandle, TInt aNumOfPackets);
+	
+private:
+	NONSHARABLE_STRUCT(TUsbTransferDescriptorDetails)
+		{
+        TUsbTransferDescriptorDetails(RUsbTransferDescriptor&, TInt, TUint, TInt);
+		RUsbTransferDescriptor& iTransferDesc;
+		const TInt iRequiredSize;
+		TUint iRequiredAlignment;
+		const TInt iRequiredMaxPackets;
+		// Members to aid internal logic
+		TInt iAssignedOffset;
+		TInt iLengthsOffset; // Only applicable to isoc
+		TInt iReqLenOffset; // Only applicable to isoc
+		TInt iResultsOffset; // Only applicable to isoc
+		TInt iNumElements; // Only applicable to isoc
+		};
+
+private:
+	TInt CalculateDataLayout(TInt& aCurrentOffset, TInt& aNumStandardTransfers, TInt& aNumIsocTransfers, TInt& aNumIsocElements);
+	void CalculateMetaDataLayout(TInt& aCurrentOffset, TInt& aMetaDataStart, TInt aNumStandardTransfers, TInt aNumIsocTransfers, TInt aNumIsocElements);
+	void InitialiseMetaData(TInt aMetaDataOffset, TInt aNumStandardTransfers, TInt aNumIsocTransfers, TInt aNumIsocElements);
+	TInt UsedPackets(TInt aHeaderOffset);
+	TBool IsPowerOfTwo(TUint aNumber);
+	TInt IncNeededToAlign(TInt aOffset, TUint aAlignment);
+	static TBool CompareTransferDescriptor(const RUsbTransferDescriptor* aTransferDesc, const TUsbTransferDescriptorDetails& aDetails);
+
+private: //Calculate additional alignment related methods
+	TInt GetMaximumMaxPacketSize(TInt& aMaxMaxBulk, TInt& aMaxMaxInterrupt);
+	TInt CaculateAdditionalAlignment(TInt aCurrentOffset, TInt aMaxMaxBulk, TInt aMaxMaxInterrupt, TUsbTransferDescriptorDetails& aTransferDetails);
+private:
+	RArray<TUsbTransferDescriptorDetails> iRegisteredTransfers;
+
+private:
+	RUsbInterface* iInterfaceHandle;
+	RChunk iChunk;
+	TInt iBaseOffset;
+	TInt iPageSize;
+	};
+
+#endif // ZEROCOPYTRANSFERSTRATEGY_H