--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/shostmassstorage/server/protocol/tblocktransfer.cpp	Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,239 @@
+// 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;
+    }
+
+
+