/*

* 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: 

*

*/

#include "memmaputils.h"

/**

Constructor: MemmapUtils class

Initilize the parameters to data members.

@internalComponent

@released

*/

MemmapUtils::MemmapUtils( )

: iHFile(0)

{

#ifdef WIN32

	iHMMFile = 0;

#endif

}

/**

Destructor: MemmapUtils class

Deallocates the memory for data members

@internalComponent

@released

*/

MemmapUtils::~MemmapUtils( )

{

	CloseMapFile();

	DeleteMapFile();

}

/**

OpenMemMapPointer: Opens the memory map pointer

@internalComponent

@released

@param aOffset - Starting offset of the memory map

@param aSize - Size of the memory map

*/

void* MemmapUtils::OpenMemMapPointer(unsigned long aOffset, unsigned long aSize)

{

#ifdef WIN32

	// Create map view pointer

	return (void*)MapViewOfFile(iHMMFile, FILE_MAP_ALL_ACCESS, 0, aOffset, aSize);

#else

	return KStatFalse;

#endif

}

/**

CloseMemMapPointer: Closes the memory map pointer

@internalComponent

@released

@param aData - Memory map pointer

@param aSize - Size of the memory map

*/

int MemmapUtils::CloseMemMapPointer(void* aData, unsigned long aSize)

{

	unsigned long statusFlg = KStatFalse;

	if(aData && iHFile)

	{

#ifdef WIN32

		statusFlg = FlushViewOfFile(aData, aSize);

		statusFlg &= FlushFileBuffers((HANDLE)_get_osfhandle(iHFile));

		statusFlg &= UnmapViewOfFile(aData);

#endif

	}

	if(statusFlg == (unsigned long)KStatFalse)

	{

		return KStatFalse;

	}

	return KStatTrue;

}

/**

OpenMapFile: Opens the file for memory mapping

@internalComponent

@released

*/

int MemmapUtils::OpenMapFile()

{

	GetMapFileName(iMapFileName);

	if(iMapFileName.empty())

	{

		return KStatFalse;

	}

#ifdef WIN32

	iHFile = open((const char*)iMapFileName.data(), (_O_CREAT | _O_BINARY | _O_RDWR));

#endif

	if((iHFile == (-1)) || (!iHFile))

	{

		Print(EAlways, "Cannot open the memory map file %s", (char*)iMapFileName.data());

		iHFile = 0;

		return KStatFalse;

	}

	return KStatTrue;

}

/**

IsMapFileOpen: Returns the open status of the memory map file

@internalComponent

@released

*/

int MemmapUtils::IsMapFileOpen()

{

	return (iHFile) ? KStatTrue : KStatFalse;

}

/**

CloseMapFile: Closes the file for memory mapping

@internalComponent

@released

*/

void MemmapUtils::CloseMapFile()

{

	if(iHFile)

	{

#ifdef WIN32

		close(iHFile);

#endif

		iHFile = 0;

	}

}

/**

DeleteMapFile: Deletes the file for memory mapping

@internalComponent

@released

*/

void MemmapUtils::DeleteMapFile()

{

#ifdef WIN32

	unlink((char*)iMapFileName.data());

#endif

}

/**

CreateFileMapObject: Creates the map file object

@internalComponent

@released

@param aSize - Size of the memory map

*/

int MemmapUtils::CreateFileMapObject(unsigned long aSize)

{

#ifdef WIN32

	// Create memory map object for the given size of the file

	iHMMFile = CreateFileMapping((HANDLE)_get_osfhandle(iHFile), NULL, 

				PAGE_READWRITE, 0, aSize, NULL);

	if(!iHMMFile || (iHMMFile == INVALID_HANDLE_VALUE))

	{

		return KStatFalse;

	}

#endif

	return KStatTrue;

}

/**

CloseFileMapObject: Closes the map file object

@internalComponent

@released

*/

void MemmapUtils::CloseFileMapObject()

{

#ifdef WIN32

	if(iHMMFile)

	{

		CloseHandle(iHMMFile);

		iHMMFile = 0;

	}

#endif

}

/**

GetMapFileName: Generates a temporary file name

@internalComponent

@released

@param aFile - Returns the name of the temporary file

*/

void MemmapUtils::GetMapFileName(String& aFile)

{

	char *fileName = 0;

#ifdef WIN32

	fileName = new char[MAX_PATH];

	if(fileName)

		GetTempFileName(".", "MMAP", 0, fileName);

	aFile.assign(fileName);

#endif

	if(fileName)

		delete[] fileName;

}