1 files changed, 105 insertions, 0 deletions
diff --git a/backends/plugins/elf-provider.cpp b/backends/plugins/elf-provider.cpp
new file mode 100644
index 0000000000..e6edd4c578
--- /dev/null
+++ b/backends/plugins/elf-provider.cpp
@@ -0,0 +1,105 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#if defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET)
+
+#include "backends/plugins/elf-provider.h"
+#include "backends/plugins/dynamic-plugin.h"
+#include "common/fs.h"
+
+#include "backends/plugins/elf-loader.h"
+
+DynamicPlugin::VoidFunc ELFPlugin::findSymbol(const char *symbol) {
+	void *func;
+	bool handleNull;
+	if (_dlHandle == NULL) {
+		func = NULL;
+		handleNull = true;
+	} else {
+		func = _dlHandle->symbol(symbol);
+	}
+	if (!func) {
+		if (handleNull) {
+			warning("Failed loading symbol '%s' from plugin '%s' (Handle is NULL)", symbol, _filename.c_str());
+		} else {
+			warning("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());
+		}
+	}
+
+	// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
+	// standard and POSIX: ISO C++ disallows casting between function pointers
+	// and data pointers, but dlsym always returns a void pointer. For details,
+	// see e.g. <http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
+	assert(sizeof(VoidFunc) == sizeof(func));
+	VoidFunc tmp;
+	memcpy(&tmp, &func, sizeof(VoidFunc));
+	return tmp;
+}
+
+bool ELFPlugin::loadPlugin() {
+		assert(!_dlHandle);
+		DLObject *obj = makeDLObject();
+		if (obj->open(_filename.c_str())) {
+			_dlHandle = obj;
+		} else {
+			delete obj;
+			_dlHandle = NULL;
+		}
+
+		if (!_dlHandle) {
+			warning("Failed loading plugin '%s'", _filename.c_str());
+			return false;
+		}
+
+		bool ret = DynamicPlugin::loadPlugin();
+
+		if (ret && _dlHandle) {
+			_dlHandle->discard_symtab();
+		}
+
+		return ret;
+};
+
+void ELFPlugin::unloadPlugin() {
+	DynamicPlugin::unloadPlugin();
+	if (_dlHandle) {
+		if (!_dlHandle->close()) {
+			warning("Failed unloading plugin '%s'", _filename.c_str());
+		}
+		delete _dlHandle;
+		_dlHandle = 0;
+	}
+}
+
+bool ELFPluginProvider::isPluginFilename(const Common::FSNode &node) const {
+	// Check the plugin suffix
+	Common::String filename = node.getName();
+	if (!filename.hasSuffix(".PLG") && !filename.hasSuffix(".plg") && !filename.hasSuffix(".PLUGIN") && !filename.hasSuffix(".plugin")) {
+		return false;
+	}
+	return true;
+}
+
+#endif // defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET)