// 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)

 	{

 	}