diff -r 000000000000 -r bde4ae8d615e os/persistentdata/persistentstorage/store/pcstore/src/filestreambuf.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/persistentdata/persistentstorage/store/pcstore/src/filestreambuf.cpp	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,179 @@
+// Copyright (c) 2006-2009 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:
+//
+
+
+#include <assert.h>
+#include <pcstore/storeexception.h>
+#include "filestreambuf.h"
+
+namespace PCStore
+{
+/**
+Constructs a file stream buffer object with the specified file name and open mode.
+
+Opens the file in specified read/write mode.
+
+@param aFileName The name of the file which the file stream buffer will open and access.
+@param aMode The mode in which the file would be opened.
+@exception TStoreException::EFileOpenError Error occurs in file opening.
+*/
+CFileStreamBuf::CFileStreamBuf(const char* aFileName, TFileMode aMode)
+	:iFile(NULL), iStreamOpened(false)
+	{
+	if(aMode == EWriteFile) 
+		{
+		iFile=fopen(aFileName,"wb");
+		}
+	else
+		{
+		iFile=fopen(aFileName,"rb");
+		}
+	if(iFile == NULL) 
+		{
+		throw TStoreException(TStoreException::EFileOpenError);
+		}
+	}
+
+/**
+Destructor.
+Closes the file.
+*/
+CFileStreamBuf::~CFileStreamBuf()
+	{
+	fclose(iFile);
+	}
+
+/**
+Flags that a stream with the specified stream id is opened.
+
+Checks whether a stream has been opened. If not, moves the file pointer to the position 
+which is represented by the given stream id, and sets the stream open flag to TRUE. If a 
+stream has been opened, throws an exception.
+
+This function is called by the constructor of CStoreReadStream and CStoreWriteStream
+to flag the new stream is opened. 
+
+@param aStreamId The stream id of the open stream.
+@exception TStoreException::EStreamExclusionError Another stream is still opened.
+@exception TStoreException::EFileSeekError Error occurs when seeking within the file 
+due to an incorrect stream id or other reason.
+*/
+void CFileStreamBuf::StreamOpen(TStreamId aStreamId)
+	{
+	//check the opened stream
+	if(iStreamOpened)
+		{
+		throw TStoreException(TStoreException::EStreamExclusionError);
+		}
+	// set pointer to the correct position
+	TInt ret = fseek(iFile,aStreamId.Value(),SEEK_SET);  
+	if(ret)
+		{
+		throw TStoreException(TStoreException::EFileSeekError);
+		}
+
+	iStreamOpened = true;
+	}
+
+/** 
+Flags that the opened stream is closed.
+
+This function is called by the destructor of the CStoreReadStream and CStoreWriteStream 
+to indicate the stream is being closed.
+*/
+void CFileStreamBuf::StreamClose()
+	{
+	iStreamOpened = false;
+	}
+
+/**
+Gets a new stream id which will be used to create a write stream.
+
+The new stream id is the end position of the store file.
+
+Moves the read/write pointer to the end to the file to get the stream id.
+
+@return The new stream id.
+@exception TStoreException::EStreamExclusionError Another stream is still opened.
+@exception TStoreException::EFileSeekError Error occurs when the file pointer is moved to 
+the end of file.
+*/	
+TStreamId CFileStreamBuf::GetNewStreamId()
+	{
+	//check the opened stream
+	if(iStreamOpened)
+		{
+		throw TStoreException(TStoreException::EStreamExclusionError);
+		}
+	// move pointer to the end of the file
+	TInt ret = fseek(iFile,0,SEEK_END);  
+	if(ret) 
+		{
+		throw TStoreException(TStoreException::EFileSeekError);
+		}
+
+	TUint size = ftell(iFile);
+	TStreamId id = size;
+	return id;
+	}
+
+/**
+Reads the specified length of 8-bit data to the supplied buffer from the file.
+
+Assert aLength must not be negative and aPtr must not be NULL.
+
+@param aPtr The pointer to the buffer to receive the read data.
+@param aLength The length of the data to read.
+@exception TStoreException::EFileReadError Error occurs in data reading.
+*/
+void CFileStreamBuf::Read(const TUint8* aPtr, TInt32 aLength)
+	{
+	assert(aLength >= 0 && aPtr != NULL);
+	if (aLength > 0) 
+		{
+		size_t numRead;
+		numRead = fread(reinterpret_cast<void*>(const_cast<TUint8*>(aPtr)),\
+			sizeof(TUint8), aLength, iFile);
+		if(numRead < static_cast<TUint32>(aLength))
+			{
+			throw TStoreException(TStoreException::EFileReadError);
+			}
+		}
+	}
+
+/**
+Writes the specified length of 8-bit data from the supplied buffer to the file.
+
+Assert aLength must not be negative and aPtr must not be NULL.
+
+@param aPtr The pointer to the buffer holding the written data.
+@param aLength The length of the data to write.
+@exception TStoreException::EFileWriteError Error occurs in data writing.
+*/
+void CFileStreamBuf::Write(const TUint8* aPtr, TInt32 aLength)
+	{
+	assert(aLength >= 0 && aPtr != NULL);	
+	if (aLength > 0)
+		{
+		size_t numWritten ;
+		numWritten  = fwrite(reinterpret_cast<void*>(const_cast<TUint8*>(aPtr)),\
+			sizeof(TUint8), aLength, iFile);
+		if(numWritten < static_cast<TUint32>(aLength))
+			{
+			throw TStoreException(TStoreException::EFileWriteError);
+			}
+		}
+	}
+}