/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

/* mail news client wrapper */
/*Dynamic Library wrapper for loading on call*/

#include "stdafx.h"
#include "mnrccln.h"

#ifdef WIN32
#define MAILNEWSDLL "MNRC32.DLL"
#else
#define MAILNEWSDLL "MNRC16.DLL"
#endif

HINSTANCE CMailNewsResourceDll::s_dllinstance=NULL;
unsigned int CMailNewsResourceDll::s_refcount=0;

CMailNewsResourceDll::CMailNewsResourceDll()
{
}
   
CMailNewsResourceDll::~CMailNewsResourceDll()
{
	if (s_dllinstance)
	{
#ifdef WIN32
		if (!FreeLibrary(s_dllinstance))
			XP_ASSERT(0);
#else
		FreeLibrary(s_dllinstance);
#endif
       s_refcount--;
	}
}

BOOL CMailNewsResourceDll::Initialize()
{
    // Running under Win3.1, if the default drive is A or B and the disk
    //  was removed, this tries to load from the default drive.
    //  So change to C before loading. (A=1, B=2, C=3)
	BOOL ret = FALSE;
    if( _getdrive() < 3 ){
        _chdrive(3);
    }
    if (s_refcount)
    {
        s_dllinstance=LoadLibrary(MAILNEWSDLL);
		if (s_dllinstance) {
			s_refcount++;
			ret = TRUE;
		}
    }
    else
    {
        s_dllinstance=LoadLibrary(MAILNEWSDLL);
        XP_ASSERT(s_dllinstance);
		if(s_dllinstance) {
            s_refcount++;
			ret = TRUE;
		}
    }
	return ret;
}

HINSTANCE
CMailNewsResourceDll::switchResources()
{
    XP_ASSERT(s_refcount);
    HINSTANCE t_hinstance=AfxGetResourceHandle();
	if (s_dllinstance)
		AfxSetResourceHandle(s_dllinstance);
    return t_hinstance;
}

CMailNewsResourceSwitcher::CMailNewsResourceSwitcher()
{
	m_oldresourcehandle = NULL;
}

void CMailNewsResourceSwitcher::Reset()
{
	if (m_oldresourcehandle)
		AfxSetResourceHandle(m_oldresourcehandle);
}


BOOL
CMailNewsResourceSwitcher::Initialize()
{
	BOOL ret = FALSE;
	if (CMailNewsResourceDll::Initialize()) {
		m_oldresourcehandle=switchResources();
		ret = TRUE;
	}

	return ret;
}