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dynamic-plugin.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-0-0rc1/backends/plugins/dynamic-plugin.h $
 * $Id: dynamic-plugin.h 32627 2008-06-09 03:59:16Z jvprat $
 *
 */

#ifndef BACKENDS_PLUGINS_DYNAMICPLUGIN_H
#define BACKENDS_PLUGINS_DYNAMICPLUGIN_H

#include "base/plugins.h"


00032 class DynamicPlugin : public Plugin {
protected:
      typedef int32 (*IntFunc)();
      typedef void (*VoidFunc)();
      typedef PluginObject *(*GetObjectFunc)();

      virtual VoidFunc findSymbol(const char *symbol) = 0;

public:
      virtual bool loadPlugin() {
            // Validate the plugin API version
            IntFunc verFunc = (IntFunc)findSymbol("PLUGIN_getVersion");
            if (!verFunc) {
                  unloadPlugin();
                  return false;
            }
            if (verFunc() != PLUGIN_VERSION) {
                  warning("Plugin uses a different API version (you have: '%d', needed is: '%d')", verFunc(), PLUGIN_VERSION);
                  unloadPlugin();
                  return false;
            }

            // Get the type of the plugin
            IntFunc typeFunc = (IntFunc)findSymbol("PLUGIN_getType");
            if (!typeFunc) {
                  unloadPlugin();
                  return false;
            }
            _type = (PluginType)typeFunc();
            if (_type >= PLUGIN_TYPE_MAX) {
                  warning("Plugin type unknown: %d", _type);
                  unloadPlugin();
                  return false;
            }

            // Validate the plugin type API version
            IntFunc typeVerFunc = (IntFunc)findSymbol("PLUGIN_getTypeVersion");
            if (!typeVerFunc) {
                  unloadPlugin();
                  return false;
            }
            if (typeVerFunc() != pluginTypeVersions[_type]) {
                  warning("Plugin uses a different type API version (you have: '%d', needed is: '%d')", typeVerFunc(), pluginTypeVersions[_type]);
                  unloadPlugin();
                  return false;
            }

            // Get the plugin's instantiator object
            GetObjectFunc getObject = (GetObjectFunc)findSymbol("PLUGIN_getObject");
            if (!getObject) {
                  unloadPlugin();
                  return false;
            }

            // Get the plugin object
            _pluginObject = getObject();
            if (!_pluginObject) {
                  warning("Couldn't get the plugin object");
                  unloadPlugin();
                  return false;
            }

            return true;
      }

      virtual void unloadPlugin() {
            delete _pluginObject;
      }
};

#endif

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