/*+
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:+
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*+
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*/+
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#include "CdlLibrary.h"+
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#include "CCdlEngine.h"+
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#include <e32svr.h>+
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#include <f32file.h>+
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#include <e32uid.h>+
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#ifdef RD_SECURE_BIN_RES+
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#include <ecom/ecom.h>+
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#endif+
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+
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const TInt KCdlLibManGranularity = 4;+
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const TUid KCdlLibraryUid = { 0x101F8BD1 };+
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+
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template<class T> +
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inline T* CheckPtrL(T* aPtr)+
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	{+
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	if (aPtr == NULL)+
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		User::Leave(KErrNotFound);+
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	return aPtr;+
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	}+
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+
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+
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//+
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// RCdlLibrary+
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//+
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+
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enum TRCdlLibraryFlags+
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	{+
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	ERCdlLibrary_RomOnly+
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	};+
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+
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RCdlLibrary::RCdlLibrary() : iName(0), iRefCount(0)+
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,iEcomDtorUid(KNullUid), iEcomImpl(0)+
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	{+
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	}+
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+
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void RCdlLibrary::Close()+
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	{+
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	REComSession::DestroyedImplementation(iEcomDtorUid);+
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	iEcomDtorUid.iUid = 0;+
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	iEcomImpl = 0;+
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	delete iName;+
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	iName = NULL;+
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	}+
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+
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TInt RCdlLibrary::CdlLoad(const TDesC& aLibName, TBool /*aRomOnly*/)+
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	{+
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	// get the ECom implementation id from the DLL name+
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	TParsePtrC parse(aLibName);+
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	TPtrC name(parse.Name());+
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	TLex lexer(name);+
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	TUint32 uid;+
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	TInt r = lexer.Val(uid, EHex);+
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	if (r!=KErrNone)+
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		return r;+
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+
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	TRAP(r, iEcomImpl = REComSession::CreateImplementationL(TUid::Uid(uid), iEcomDtorUid, NULL));+
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+
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	delete iName;+
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	iName = 0;+
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+
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	if (r==KErrNone)+
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		{+
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		iName = aLibName.Alloc();+
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		if (!iName)+
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			{+
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			Close();+
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			return KErrNoMemory;+
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			}+
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+
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		iShortName.Set(ExtractName(*iName));+
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		}+
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+
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	return r;+
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	}+
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+
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TBool RCdlLibrary::CheckIfNotRomOnly(TBool aRomOnly, const TDesC& aName)+
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	{+
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	return	aRomOnly &&+
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			aName.Length() >= 2 && aName[1] == ':' && +
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			aName[0] != 'z' && aName[0] != 'Z';+
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	}+
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+
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const SCdlCustomisation* RCdlLibrary::CustomisationL(TUid aUid, TInt aImplId) const+
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	{+
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	const TCdlArray<SCdlCustomisation>& contents = ContentsL();+
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+
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	// first try the micro customisation optimisation, where aImplId is an index into+
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	// the contents table.+
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	if (0 <= aImplId && aImplId < contents.iCount)+
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		{+
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		const SCdlCustomisation& c = contents[aImplId];+
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		if (c.iInterface->iUid == aUid && c.iId == aImplId)+
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			return &c;+
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		}+
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+
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	// if that failed, scan the contents table.+
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	for (TInt ii=0; ii<contents.iCount; ii++)+
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		{+
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		const SCdlCustomisation& c = contents[ii];+
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		if (c.iInterface->iUid == aUid && c.iId == aImplId)+
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			return &c;+
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		}+
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+
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	User::Leave(KErrNotFound);+
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	return NULL;+
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	}+
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+
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const TCdlArray<SCdlCustomisation>& RCdlLibrary::ContentsL() const+
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	{+
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	TAny* f = iEcomImpl;+
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	SCdlMain* m = CheckPtrL((SCdlMain*)(f));+
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+
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	if (m->iMajorVer != KCdlCompilerMajorVersion || m->iMinorVer != KCdlCompilerMinorVersion)+
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		User::Leave(KErrCorrupt);+
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	return *CheckPtrL((const TCdlArray<SCdlCustomisation>*)(m->iData));+
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	}+
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+
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TPtrC RCdlLibrary::Name() const+
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	{+
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	return iShortName;+
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	}+
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+
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const TDesC* RCdlLibrary::FullName() const+
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	{+
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	return iName;+
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	}+
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+
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TPtrC RCdlLibrary::ExtractName(const TDesC& aLibName)+
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	{+
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	// find the postion of the colon in aLibName+
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	TInt colonPos = aLibName.Locate(':');+
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	// set name to be after the colon in aLibName, this works when colonPos is KErrNotFound (-1) too+
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	TPtrC name(aLibName.Mid(colonPos + 1));+
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	// find the postion of the last slash+
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	TInt lastSlashPos = name.LocateReverse('\\');+
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	// move name so that it only contains name after the last slash. Works with -1 again.+
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	name.Set(name.Mid(lastSlashPos + 1));+
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	// find the position of the "." in the name+
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	TInt dotPos = name.Locate('.');+
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	// if there is a dot, set the name to be the portion before the dot.+
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	if (dotPos != KErrNotFound)+
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		name.Set(name.Left(dotPos));+
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	// name will now be the file name only, without extension.+
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	return name;+
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	}+
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+
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TBool RCdlLibrary::SameShortName(const TDesC& aShortLibName)+
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    {+
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    // Call Compare first, because it's much faster if the+
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	// strings match+
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	if (iShortName.Compare(aShortLibName) == 0)+
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		{+
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		return ETrue;+
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		}+
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	return iShortName.CompareF(aShortLibName) == 0;+
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	}+
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+
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TBool RCdlLibrary::IsLibLoadedAsRomOnly() const+
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	{+
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	return iFlags[ERCdlLibrary_RomOnly];+
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	}+
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+
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void RCdlLibrary::SetLibLoadedAsRomOnly()+
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	{+
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	iFlags.Set(ERCdlLibrary_RomOnly);+
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	}+
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+
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//+
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// RCdlLibRef+
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//+
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+
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RCdlLibRef::RCdlLibRef() : iLibMan(0), iLib(0)+
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	{+
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	}+
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+
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void RCdlLibRef::Close()+
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	{+
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	if (iLib && iLibMan)+
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		iLibMan->Close(iLib);+
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	iLibMan = 0;+
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	iLib = 0;+
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	}+
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+
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RCdlLibrary* RCdlLibRef::Lib() const+
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	{+
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	return iLib;+
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	}+
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+
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void RCdlLibRef::SetRef(CCdlLibManager* aLibMan, RCdlLibrary* aLib)+
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	{+
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	__ASSERT_ALWAYS(!iLib && !iLibMan, Panic(ECdlEngPanic_LibraryAlreadySet));+
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	iLibMan = aLibMan;+
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	iLib = aLib;+
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	}+
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+
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TPtrC RCdlLibRef::Name() const+
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	{+
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	return iLib->Name();+
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	}+
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+
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+
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+
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//+
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// CCdlLibManager+
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//+
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+
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CCdlLibManager::CCdlLibManager() : iLibs(KCdlLibManGranularity)+
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	{+
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	}+
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+
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CCdlLibManager::~CCdlLibManager()+
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	{+
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	delete iLazyUnloader;+
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	TInt count = iLibs.Count();+
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	for (TInt ii=0; ii<count; ii++)+
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		iLibs[ii]->Close();+
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	iLibs.ResetAndDestroy();+
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	if (iEcom)+
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		{+
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		iEcom->Close();+
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		REComSession::FinalClose();+
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		}+
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	}+
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+
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void CCdlLibManager::ConstructL()+
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	{+
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	iEcom = &REComSession::OpenL();+
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	}+
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+
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RCdlLibRef CCdlLibManager::LoadL(const TDesC& aLibName, RCdlLibrary* aLib, TBool aRomOnly)+
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	{+
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	__ASSERT_DEBUG(aLib || !FindLib(aLibName), Panic(ECdlEngPanic_LibraryCanBeFound));+
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+
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	// load new library if a lib is not supplied+
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	if (!aLib)+
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		{+
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		aLib = new(ELeave) RCdlLibrary;+
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		CleanupStack::PushL(aLib);+
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		User::LeaveIfError(aLib->CdlLoad(aLibName, aRomOnly));+
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		CleanupClosePushL(*aLib);+
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		iLibs.AppendL(aLib);+
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		CleanupStack::Pop(2);		// lib->Close() and lib's heap cell+
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		}+
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+
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	if (aRomOnly)+
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		{+
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		// the lib must be ROM only if aRomOnly is set and we got here.+
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		aLib->SetLibLoadedAsRomOnly();+
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		}+
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+
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	RCdlLibRef ref;+
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	ref.SetRef(this, aLib);+
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	aLib->RefCount()++;+
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	return ref;+
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	}+
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+
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void CCdlLibManager::Close(RCdlLibrary* aLib)+
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	{+
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	aLib->RefCount()--;+
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	if (aLib->RefCount()==0 && !iLazyUnloader)+
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		{+
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		// note, not (ELeave) because Close can't leave and+
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		// unloading can always be left till another time if+
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		// it doesn't work now.+
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		iLazyUnloader = new CAsyncCallBack(TCallBack(LazyUnload, this), CActive::EPriorityLow);+
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		if (iLazyUnloader)+
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			iLazyUnloader->CallBack();+
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		}+
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	}+
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+
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TInt CCdlLibManager::LazyUnload(TAny* aThis)+
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	{+
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	static_cast<CCdlLibManager*>(aThis)->DoLazyUnload();+
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	return 0;+
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	}+
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	+
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void CCdlLibManager::DoLazyUnload()+
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	{+
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	TInt count = iLibs.Count();+
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	for (TInt ii=count-1; ii>=0; ii--)+
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		{+
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		RCdlLibrary* lib = iLibs[ii];+
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		if (lib->RefCount() <= 0)+
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			{+
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			iLibs.Delete(ii--);+
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			lib->Close();+
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			delete lib;+
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			}+
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		}+
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+
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	delete iLazyUnloader;+
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	iLazyUnloader = 0;+
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	}+
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	+
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RCdlLibrary* CCdlLibManager::FindLib(const TDesC& aLibName) const+
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	{+
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	RCdlLibrary* lib = NULL;+
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	TPtrC libName(RCdlLibrary::ExtractName(aLibName));+
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+
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	// search for already loaded library+
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	TInt count = iLibs.Count();+
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	for (TInt ii=0; ii<count; ii++)+
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		{+
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		if (iLibs[ii]->SameShortName(libName))+
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			{+
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			lib = iLibs[ii];+
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			break;+
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			}+
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		}+
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+
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	return lib;+
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	}+
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+
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TBool CCdlLibManager::IsLibLoadedAsRomOnly(const TDesC& aLibName) const+
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	{+
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	RCdlLibrary* lib = FindLib(aLibName);+
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	return lib && lib->IsLibLoadedAsRomOnly();+
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	}+
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