mirror of
https://github.com/libretro/scummvm.git
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102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef BACKENDS_PLUGINS_DYNAMICPLUGIN_H
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#define BACKENDS_PLUGINS_DYNAMICPLUGIN_H
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#include "base/plugins.h"
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class DynamicPlugin : public Plugin {
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protected:
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typedef int32 (*IntFunc)();
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typedef void (*VoidFunc)();
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typedef PluginObject *(*GetObjectFunc)();
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virtual VoidFunc findSymbol(const char *symbol) = 0;
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public:
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virtual bool loadPlugin() {
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// Validate the plugin API version
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IntFunc verFunc = (IntFunc)findSymbol("PLUGIN_getVersion");
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if (!verFunc) {
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unloadPlugin();
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return false;
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}
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if (verFunc() != PLUGIN_VERSION) {
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warning("Plugin uses a different API version (you have: '%d', needed is: '%d')", verFunc(), PLUGIN_VERSION);
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unloadPlugin();
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return false;
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}
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// Get the type of the plugin
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IntFunc typeFunc = (IntFunc)findSymbol("PLUGIN_getType");
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if (!typeFunc) {
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unloadPlugin();
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return false;
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}
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_type = (PluginType)typeFunc();
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if (_type >= PLUGIN_TYPE_MAX) {
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warning("Plugin type unknown: %d", _type);
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unloadPlugin();
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return false;
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}
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// Validate the plugin type API version
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IntFunc typeVerFunc = (IntFunc)findSymbol("PLUGIN_getTypeVersion");
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if (!typeVerFunc) {
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unloadPlugin();
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return false;
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}
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if (typeVerFunc() != pluginTypeVersions[_type]) {
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warning("Plugin uses a different type API version (you have: '%d', needed is: '%d')", typeVerFunc(), pluginTypeVersions[_type]);
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unloadPlugin();
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return false;
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}
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// Get the plugin's instantiator object
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GetObjectFunc getObject = (GetObjectFunc)findSymbol("PLUGIN_getObject");
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if (!getObject) {
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unloadPlugin();
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return false;
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}
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// Get the plugin object
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_pluginObject = getObject();
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if (!_pluginObject) {
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warning("Couldn't get the plugin object");
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unloadPlugin();
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return false;
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}
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return true;
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}
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virtual void unloadPlugin() {
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delete _pluginObject;
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}
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};
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#endif
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