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/* 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.
*
*/
#ifndef BACKENDS_PLUGINS_DYNAMICPLUGIN_H
#define BACKENDS_PLUGINS_DYNAMICPLUGIN_H
#include "base/plugins.h"
#include "common/textconsole.h"
class DynamicPlugin : public Plugin {
protected:
typedef int32 (*IntFunc)();
typedef void (*VoidFunc)();
typedef PluginObject *(*GetObjectFunc)();
virtual VoidFunc findSymbol(const char *symbol) = 0;
const Common::String _filename;
public:
DynamicPlugin(const Common::String &filename) :
_filename(filename) {}
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;
}
virtual const char *getFileName() const {
return _filename.c_str();
}
};
#endif
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