Initial commit

backends/plugins/elf/elf-provider.h

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef BACKENDS_PLUGINS_ELF_PROVIDER_H
+#define BACKENDS_PLUGINS_ELF_PROVIDER_H
+
+#include "common/scummsys.h"
+
+#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER)
+
+#include "backends/plugins/elf/elf-loader.h"
+
+#include "common/fs.h"
+
+/**
+ * ELFPlugin
+ *
+ * Objects of this class are returned when the PluginManager calls
+ * getPlugins() on an ELFPluginProvider. An intermediary class for
+ * dealing with plugin files, ELFPlugin is responsible for creating/destroying
+ * a DLObject that handles the opening/loading/unloading of the plugin file whose
+ * path in the target backend's file system is "_filename".
+ */
+class ELFPlugin : public DynamicPlugin {
+protected:
+	typedef const char *(*CharFunc)();
+
+	DLObject *_dlHandle;
+	void *_dso_handle;
+
+	virtual VoidFunc findSymbol(const char *symbol);
+
+public:
+	ELFPlugin(const Common::Path &filename) :
+		DynamicPlugin(filename),
+		_dlHandle(0),
+		_dso_handle(0) {
+	}
+
+	virtual ~ELFPlugin() {
+		if (_dlHandle)
+			unloadPlugin();
+	}
+
+	virtual DLObject *makeDLObject() = 0;
+
+	virtual bool loadPlugin();
+	virtual void unloadPlugin();
+	void trackSize();
+};
+
+template<class T>
+class TemplatedELFPlugin : public ELFPlugin {
+public:
+	TemplatedELFPlugin(const Common::Path &filename) :
+		ELFPlugin(filename) {
+	}
+
+	virtual DLObject *makeDLObject() {
+		return new T();
+	}
+};
+
+
+class ELFPluginProvider : public FilePluginProvider {
+protected:
+	virtual Plugin *createPlugin(const Common::FSNode &node) const = 0;
+	virtual PluginList getPlugins();
+
+	bool isPluginFilename(const Common::FSNode &node) const;
+};
+
+#endif // defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER)
+
+#endif /* BACKENDS_PLUGINS_ELF_PROVIDER_H */