// Copyright (c) 2008-2009 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

 @internalTechnology

*/

#include <e32def.h>

#include <e32std.h>

#include <e32base.h>

#include "msctypes.h"

#include "mblocktransferprotocol.h"

#include "tblocktransfer.h"

#include "debug.h"

#include "msdebug.h"

/**

Manage a read from a block device.

@param aProtocol A reference to object providing protocol read method

@param aPosition The position to start reading from

@param aLength The length of data to read

@param aBuf Buffer to copy the data to

*/

void TBlockTransfer::ReadL(MBlockTransferProtocol& aProtocol,

                           TPos aPosition,

                           TInt aLength,

                           TDes8& aBuf)

    {

    __MSFNLOG

	__HOSTPRINT1(_L("blocklen = 0%lx"), iBlockLength);

	TInt copylen = 0;

    TInt headlen = 0;

	aBuf.SetLength(0);

    TPos headOffset = GetHeadBlockOffset(aPosition);

	/**** READ10 HEAD ****/

	if (headOffset)

        {

		TPos headpos = aPosition - headOffset;

        iHeadbuf->Zero();

		headlen = ((headOffset + aLength - 1) / iBlockLength) == 0 ? aLength : (iBlockLength - headOffset);

		__HOSTPRINT2(_L("\tRead head pos = 0%lx length = 0%lx"),

                     headpos, iBlockLength);

		aProtocol.BlockReadL(headpos, *iHeadbuf, iBlockLength);

		aBuf.Append(iHeadbuf->Ptr() + headOffset, headlen);		

        }

	/**** READ10 BODY ****/

    TInt blocksInMain = (aLength - headlen)/iBlockLength;

	if (blocksInMain)

        {

		copylen = blocksInMain * iBlockLength;

		__HOSTPRINT2(_L("\tRead main pos = 0%lx length = 0x%x"),

                     aPosition+headlen, copylen);

		aProtocol.BlockReadL(aPosition+headlen, (TDes8 &)aBuf, copylen);

        }

	copylen += headlen;

	/**** READ10 TAIL ****/

    TInt tailLen = aLength - copylen;

	if ((tailLen) != 0)

        {

		__HOSTPRINT2(_L("\tRead tail pos = 0%lx length = 0%lx"),

                     aPosition+copylen, iBlockLength);

        iTailbuf->Zero();    

		aProtocol.BlockReadL(aPosition+copylen, *iTailbuf, iBlockLength);

		aBuf.Append(iTailbuf->Ptr(), tailLen);

        }

    }

/**

Manage a write to a block device

@param aProtocol A reference to object providing protocol read method

@param aPosition The position to start reading from

@param aLength The length of data to read

@param aBuf Buffer containing the data to write

*/

void TBlockTransfer::WriteL(MBlockTransferProtocol& aProtocol,

                            TPos aPosition,

                            TInt aLength,

                            TDesC8& aBuf)

    {

    __MSFNLOG

	TInt copylen = 0;

    TInt headlen = 0;

    TPos headOffset = GetHeadBlockOffset(aPosition);

	/**** WRITE10 HEAD ****/

	if (headOffset)

        {

		TPos headpos = aPosition - headOffset;

        iHeadbuf->Zero();

        RBuf8& buf = *iTailbuf;

        buf.Zero();

		headlen = ((headOffset + aLength - 1) / iBlockLength) == 0 ? aLength : (iBlockLength - headOffset);

		__HOSTPRINT2(_L("\tWrite-Read head pos = 0%lx length = 0%lx"),

                     headpos, iBlockLength);

		aProtocol.BlockReadL(headpos, *iHeadbuf, iBlockLength);

		/* get head */

		__HOSTPRINT2(_L("\tcopying read data pos = 0%lx offset = 0%lx"),

                     headpos, headOffset);

		buf.Append(iHeadbuf->Ptr(), headOffset);

		/* get body */

		buf.Append(aBuf.Ptr(), headlen);

		/* Is it a short write and tail exist? */

        TInt headEndOffset = headOffset + headlen;

		if (headEndOffset != iBlockLength)

            {

            TInt len = iBlockLength - headEndOffset;

			__HOSTPRINT2(_L("\t(short write) copying read data pos = 0%lx length = %08x"),

                         (headpos + headEndOffset), len);

			buf.Append(iHeadbuf->Ptr() + headEndOffset, len);

            }

		__HOSTPRINT2(_L("\tWrite head pos = 0%lx length = %08x"),

                     headpos, headlen);

		aProtocol.BlockWriteL(headpos, (TDes8 &)buf, 0, iBlockLength);

        }

	/**** WRITE10 BODY ****/

    TPos blocksInMain = (aLength - headlen)/iBlockLength;

	if (blocksInMain)

        {

		copylen = blocksInMain * iBlockLength;

        const TUint64 pos = aPosition + headlen;

		__HOSTPRINT2(_L("\tWrite main pos = 0%lx length = %08x"),

                     pos, copylen);

		/* form the body */

		aProtocol.BlockWriteL(pos, (TDes8 &)aBuf, headlen, copylen);

        }

	copylen += headlen;

	/**** WRITE10 TAIL ****/

    TInt tailLen = aLength - copylen;;

	if (tailLen != 0)

        {

        RBuf8& buf = *iHeadbuf;

        buf.Zero();

        iTailbuf->Zero();

        const TUint64 pos = aPosition + copylen;

		__HOSTPRINT2(_L("\tWrite-Read tail pos = 0%lx length = %08x"),

                     pos, iBlockLength);

		aProtocol.BlockReadL(pos, *iTailbuf, iBlockLength);

		/* get head */

		buf.Append(aBuf.Ptr() + copylen, tailLen);

		/* get tail */

		buf.Append(iTailbuf->Ptr() + tailLen, iBlockLength - tailLen);

		aProtocol.BlockWriteL(pos, (TDes8 &)buf, 0, iBlockLength);

        }

    }

void TBlockTransfer::SetCapacityL(TUint32 aBlockLength, TLba aLastLba)

    {

    __MSFNLOG

    iBlockLength = static_cast<TInt64>(aBlockLength);

    iLastLba = aLastLba;

    __ASSERT_DEBUG(iHeadbuf, User::Invariant());

    __ASSERT_DEBUG(iTailbuf, User::Invariant());

    if (iHeadbuf->Length() < iBlockLength)

        {

        iHeadbuf->ReAllocL(aBlockLength);

        iTailbuf->ReAllocL(aBlockLength);

        }    

    }

TPos TBlockTransfer::GetHeadBlockOffset(TPos aPos)

    {

    __MSFNLOG

	return (aPos % iBlockLength);

    }

TLba TBlockTransfer::GetHeadBlockLbaL(TPos aPos)

    {

    __MSFNLOG

    TLba lba = I64LOW(aPos / iBlockLength);

    if (lba > iLastLba)

        User::Leave(KErrArgument);

    return lba;

    }

TPos TBlockTransfer::GetTailBlockOffset(TPos aPos, TInt aLen)

    {

    __MSFNLOG

    return ((aPos + aLen) % iBlockLength);

    }

TLba TBlockTransfer::GetTailBlockLbaL(TPos aPos, TInt aLen)

    {

    __MSFNLOG

    TLba lba = I64LOW((aPos + aLen) / iBlockLength);

    if (lba > iLastLba)

        User::Leave(KErrArgument);

    return lba;

    }