// 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;

     }