// 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:

// Name        : loadeddlls.cpp

// Part of     : libdl library

// Implements and maintains the list of opened dll.

// 

//

// INCLUDE FILES

#include "loadeddlls.h"

//-----------------------------------------------------------------------------

//Function Name : CLoadedDlls::CLoadedDlls()

//Description   : Constructor

//-----------------------------------------------------------------------------

CLoadedDlls::CLoadedDlls()

	{

	const TInt error = CreateLock();  

	//if error creating lock, panic.

	if ( KErrNone != error )

		{

		User::Panic(_L(""), error);

		}

	}

//-----------------------------------------------------------------------------

//Function Name : CLoadedDlls::~CLoadedDlls()

//Description   : Destructor

//-----------------------------------------------------------------------------

CLoadedDlls::~CLoadedDlls()

	{

	iLock.Close();

	iHandleList.Close();

	}

//-----------------------------------------------------------------------------

//Function Name : TInt CLoadedDlls::Add(const TDllEntry& aDllEntry)

//Description   : To add the dll to the list.

//Return Value  : KErrNone if added successfully else system wide error

//-----------------------------------------------------------------------------

TInt CLoadedDlls::Add(const TDllEntry& aDllEntry) 

	{

	return iHandleList.Append(aDllEntry);

	}

//-----------------------------------------------------------------------------

//Function Name : void CLoadedDlls::Remove(const TInt aIndex)

//Description   : To remove the dll from the list.

//-----------------------------------------------------------------------------

void CLoadedDlls::Remove(const TInt aIndex)

	{

	iHandleList.Remove(aIndex);

	iHandleList.GranularCompress();

	}

//-----------------------------------------------------------------------------

//Function Name : TDllEntry& CLoadedDlls::At(const TInt aIndex)

//Description   : Get DllEntry& at particular index. This function assumes that

//				  index is valid.

//Return Value  : TDllEntry& DllEntry corresponding to aIndex

//-----------------------------------------------------------------------------

TDllEntry& CLoadedDlls::At(const TInt aIndex)

	{

	return iHandleList[aIndex];

	}

//-----------------------------------------------------------------------------

//Function Name : TInt CLoadedDlls::Find(const void* aHandle) const

//Description   : Finds if dll with this handle exist or not

//Return Value  : Index in list if found else KErrNotFound

//-----------------------------------------------------------------------------

TInt CLoadedDlls::Find(const void* aHandle) const

	{

	TDllEntry tempDllEntry((TInt) aHandle);

	return iHandleList.Find(tempDllEntry, TIdentityRelation<TDllEntry>(TDllEntry::CompareByHandle));

	}

//-----------------------------------------------------------------------------

//Function Name : TInt CLoadedDlls::Find(const RLibrary& aLibrary) const

//Description   : Finds if dll with this library i.e. same path exist or not

//Return Value  : Index in list if found else KErrNotFound

//-----------------------------------------------------------------------------

TInt CLoadedDlls::Find(const RLibrary& aLibrary) const

	{

	TDllEntry tempDllEntry(aLibrary);

	return iHandleList.Find(tempDllEntry,TIdentityRelation<TDllEntry>(TDllEntry::CompareByPath));

	}

//-----------------------------------------------------------------------------

//Function Name : TBool TDllEntry::CompareByHandle(const TDllEntry& aEntry) 

//Description   : Comparator function, compares iLibrary.Handle() of two

//				  TDllEntry.

//Return Value  : ETrue if Handle of both TDllEntry's RLibrary's matches

//				  else EFalse.

//-----------------------------------------------------------------------------

TBool TDllEntry::CompareByHandle(const TDllEntry& aEntry1, const TDllEntry& aEntry2)

	{

	if (aEntry1.iLibrary.Handle() == aEntry2.iLibrary.Handle())

		{

		return ETrue;

		}

	return EFalse;

	}

//-----------------------------------------------------------------------------

//Function Name : TBool TDllEntry::CompareByPath(const TDllEntry& aEntry)

//Description   : Comparator function, compares path corresponding to two

//				  TDllEntry.

//Return Value  : ETrue if file name of both TDllEntry's RLibrary's matches

//				  else EFalse.

//-----------------------------------------------------------------------------

TBool TDllEntry::CompareByPath(const TDllEntry& aEntry1, const TDllEntry& aEntry2)

	{

	if (aEntry1.iLibrary.FileName().Compare(aEntry2.iLibrary.FileName()))

		{

		return EFalse;

		}

	return ETrue;

	}		

//-----------------------------------------------------------------------------

//Function Name : TDllEntry::TDllEntry(const RLibrary aLibrary, const TInt aFlag)

//Description   : constructor. to initialise library by RLibrary object

//-----------------------------------------------------------------------------

TDllEntry::TDllEntry(const RLibrary& aLibrary, const TInt aFlag) : iLibrary(aLibrary), iFlags(aFlag), iRefCount(1)

	{

	}