// 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 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:

// bootldr\inc\ymodem.h

// 

//

#ifndef __YMODEM_H__

#define __YMODEM_H__

#ifndef __KERNEL_MODE__

#include <e32base.h>

typedef CBase BASE;

//#else

//#include <kernel/kernel.h>

//typedef DBase BASE;

#endif

const TUint8 SOH=0x01;

const TUint8 STX=0x02;

const TUint8 EOT=0x04;

const TUint8 ACK=0x06;

const TUint8 NAK=0x15;

const TUint8 CAN=0x18;

const TUint8 SUB=0x1A;

const TUint8 BIGC=0x43;

const TUint8 BIGG=0x47;

const TInt KErrZeroLengthPacket=-200;

const TInt KErrPacketTooShort=-201;

const TInt KErrBadPacketType=-202;

const TInt KErrCorruptSequenceNumber=-203;

const TInt KErrWrongSequenceNumber=-204;

const TInt KErrBadCrc=-205;

const TInt KErrBadTerminationPacket=-206;

const TInt KHeaderBufferSize=1024; 

class YModem : public BASE

	{

public:

	TInt StartDownload(TBool aG, TInt& aLength, TDes& aName);

	TInt ReadPackets(TUint8*& aDest, TInt aLength);

	// Support to deflated ROM Image

	TInt GetInnerCompression(TBool &aImageDeflated, TBool &aRomLoaderHeaderExists);

	TInt GetHeaderBufferContent(TUint8*& aDest, TInt& aLength);

	TBool IsHeaderStored(void);

protected:

	YModem(TBool aG);

	void UpdateCrc(const TUint8* aPtr, TInt aLength);

	TInt CheckPacket(TUint8* aDest);

	TInt ReadPacket(TDes8& aDest);

	virtual TInt ReadBlock(TDes8& aDest)=0;

	virtual void WriteC(TUint aChar)=0;

protected:

	TInt iTimeout;

	TInt iState;

	TInt iPacketSize;

	TInt iBlockSize;

	TUint8 iInitChar;

	TUint8 iSeqNum;

	TUint16 iCrc;

	TInt iFileSize;

	TBuf8<1040> iPacketBuf;

	TBuf<256> iFileName;

    // Support to deflated ROM Image

	TBuf8<KHeaderBufferSize> iHeaderBuf;

    TBool iHeaderStored;

    TInt iDataSizeInPuffer;

    TBool iImageDeflated;

	};

#endif