sysstatemgmt/systemstatereferenceplugins/custcmd/src/ssmuiproviderdllswitch.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 00:53:00 +0200
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// Copyright (c) 2007-2009 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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// ssmcustomuidswitch.cpp
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// 
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//
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/**
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 @file
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 @internalComponent
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 @released
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*/
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#include <emulator.h>
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extern "C" {
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#include "ssmuiproviderdllswitch_stubs.h"
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FARPROC vector[MAX_ORDINAL + 1];
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void fill_vector(HINSTANCE aDll)
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	{
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	int i;
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	for (i=1; i <= MAX_ORDINAL; i++)
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		{
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		vector[i] = GetProcAddress(aDll, (LPCSTR)i);
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		}
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	vector[0] = (FARPROC)1;		// initialised
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	}
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void init_vector()
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	{
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	// prevent deadlock with EKA2 scheduler
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	__LOCK_HOST;
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	HINSTANCE instance;
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	// Try loading dll with customised uid data first
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	//
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	instance = LoadLibraryA("ssmuiproviderdllcustomised.dll");
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	if (instance != NULL)
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		{
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		fill_vector(instance);
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		return;
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		}
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	// Try loading dll with default uid data
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	//
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	instance = LoadLibraryA("ssmuiproviderdlldefault.dll");
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	if (instance != NULL)
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		{
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		fill_vector(instance);
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		return;
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		}
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	// die
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	//
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	OutputDebugStringA("Unable to load ssm custom command uid implementation");
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	_asm int 3;
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	}
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__declspec(naked) void common_dispatch()
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	{
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	_asm cmp	dword ptr vector,0		// initialised?
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	_asm jne  	call_though_vector
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	_asm push	eax
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	_asm push	ecx
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	_asm push	edx
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	_asm call	init_vector
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	_asm pop	edx
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	_asm pop 	ecx
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	_asm pop 	eax
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call_though_vector:
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	_asm jmp	[vector+eax*4]
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	} //lint !e1065 Suppress Symbol 'common_dispatch(void)' not declared as "C" conflicts
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}