source: vbox/trunk/src/libs/xpcom18a4/xpcom/components/xcDll.h@ 103140

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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/* Dll
 *
 * Programmatic representation of a dll. Stores modifiedTime and size for
 * easy detection of change in dll.
 *
 * dp Suresh <dp@netscape.com>
 */

#ifndef xcDll_h__
#define xcDll_h__

#include "nsISupports.h"
#include "nsILocalFile.h"
#include "nsCOMPtr.h"
#include "nsString.h"

#include <iprt/errcore.h>
#include <iprt/ldr.h>

class nsNativeComponentLoader;

class nsIModule;
class nsIServiceManager;

typedef enum nsDllStatus
{
        DLL_OK = 0,
        DLL_NO_MEM = 1,
        DLL_STAT_ERROR = 2,
        DLL_NOT_FILE = 3,
        DLL_INVALID_PARAM = 4
} nsDllStatus;

class nsDll
{
private:
    nsCOMPtr<nsIFile>         m_dllSpec;
    RTLDRMOD                  m_hMod;
    nsIModule                *m_moduleObject;
    nsNativeComponentLoader  *m_loader;
    PRBool                    m_markForUnload;

    void Init(nsIFile *dllSpec);

public:

    nsDll(nsIFile *dllSpec, nsNativeComponentLoader* loader);
    ~nsDll(void);

    // Dll Loading
    PRBool Load(void);
    PRBool Unload(void);
    PRBool IsLoaded(void) { return ((m_hMod != NIL_RTLDRMOD) ? PR_TRUE : PR_FALSE); }

    void MarkForUnload(PRBool mark) { m_markForUnload = mark; }
    PRBool IsMarkedForUnload(void) { return m_markForUnload; }

    // Shutdown the dll. This will call any on unload hook for the dll.
    // This wont unload the dll. Unload() implicitly calls Shutdown().
    nsresult Shutdown(void);

    void *FindSymbol(const char *symbol);

    PRBool HasChanged(void);

    void GetDisplayPath(nsACString& string);

#if 0
    PRLibrary *GetInstance(void) { return (m_instance); }
#endif

    // NS_RELEASE() is required to be done on objects returned
    nsresult GetDllSpec(nsIFile **dllSpec);
    nsresult GetModule(nsISupports *servMgr, nsIModule **mobj);
};

#endif /* xcDll_h__ */