// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

//

#if !defined(__U32FRAME_H__)

#define __U32FRAME_H__

#if !defined(__S32SHARE_H__)

#include <s32share.h>

#endif

#if defined(_DEBUG)&&!defined(__SMALL_FRAME)

//#define __SMALL_FRAME

#endif

//

enum TFrameType16

	{

	EFrameFree16=0x0000,

	EFrameData16=0x4000,

	EFrameDescriptive16=0x8000,

	EFrameContinuation16=0xc000

	};

typedef TUint16 TFrameDes16;

const TInt KSizeFrameDes16=sizeof(TFrameDes16);

const TInt KShiftFrameDes16=1;

//

const TInt KMaskFrame16=0xffff;

const TInt KMaskFrameType16=0xc000;

#if defined(__SMALL_FRAME)

const TInt KMaskFrameLength16=0xf;

const TInt KShiftFrameLength16=4;

#else

const TInt KMaskFrameLength16=0x3fff;

const TInt KShiftFrameLength16=14;

#endif

//

const TInt KFrameOpen16=0;

const TInt KFrameMinLength16=1;

const TInt KFrameMaxLength16=KMaskFrameLength16;

const TInt KFrameFullLength16=KMaskFrameLength16+1;

//

const TInt KFrameNonexistent16=-1;

//

NONSHARABLE_CLASS(RFrame16Buf) : public MStreamBuf

	{

public:

	static TInt Offset(TStreamPos aBase,TStreamPos aPos);

	static TStreamPos Position(TStreamPos aBase,TInt anOffset);

//

	RFrame16Buf(TStreamPos aBase);

	inline TStreamPos Base() const;

	inline TInt Offset(TStreamPos aPos) const;

	inline TStreamPos Position(TInt anOffset) const;

//

	TInt ExtendL(TStreamExchange& aHost,TInt anExtent,TInt aMode=ERead|EWrite);

	void OpenL(TStreamExchange& aHost,TInt anOffset,TInt aMode=ERead|EWrite);

	void Set(TStreamExchange& aHost,TInt anOffset,TInt anExtent,TInt aMode=ERead|EWrite);

//

	inline TInt Offset() const;

	inline TInt Extent() const;

protected:

	inline TBool IsCommitted() const;

	void CommitL();

//

	void DoRelease();

	void DoSynchL();

private:

	TInt DoReadL(TAny* aPtr,TInt aMaxLength);

	TInt DoReadL(TDes8& aDes,TInt aMaxLength,TRequestStatus& aStatus);

	TStreamTransfer DoReadL(MStreamInput& anInput,TStreamTransfer aTransfer);

	void DoWriteL(const TAny* aPtr,TInt aLength);

	TInt DoWriteL(const TDesC8& aDes,TInt aMaxLength,TRequestStatus& aStatus);

	TStreamTransfer DoWriteL(MStreamOutput& anOutput,TStreamTransfer aTransfer);

	TStreamPos DoSeekL(TMark aMark,TStreamLocation aLocation,TInt anOffset);

//

	inline TStreamExchange& Host() const;

	TInt UnderflowL();

	void OverflowL();

	TBool ReachL(TInt anOffset);

	TInt EndL();

private:

	TStreamPos iBase;

	TStreamExchange* iHost;

	TInt iOff;

	TInt iExt;

	TStreamMark iRMark,iWMark;

	TInt iRAvail,iWAvail;

	TInt iRLim,iWLim;

	TInt iMode;

	};

#include "U32FRAME.INL"

#endif