minor initial commit for ps2 plugins. Added ps2-provider code

svn-id: r49253

backends/plugins/ps2/ps2-provider.cpp

@@ -0,0 +1,83 @@
+#if defined(DYNAMIC_MODULES) && defined(__PS2__)
+
+#include "backends/plugins/ps2/ps2-provider.h"
+#include "backends/plugins/dynamic-plugin.h"
+#include "common/fs.h"
+
+#include "backends/platform/ps2/ps2loader.h"
+
+
+class PS2Plugin : public DynamicPlugin {
+protected:
+	void *_dlHandle;
+	Common::String _filename;
+
+	virtual VoidFunc findSymbol(const char *symbol) {
+		void *func = dlsym(_dlHandle, symbol);
+		if (!func)
+			warning("Failed loading symbol '%s' from plugin '%s' (%s)", symbol, _filename.c_str(), dlerror());
+
+		// 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;
+	}
+
+public:
+	PS2Plugin(const Common::String &filename)
+		: _dlHandle(0), _filename(filename) {}
+
+	~PS2Plugin() {
+		if (_dlHandle) unloadPlugin();
+	}
+
+	bool loadPlugin() {
+		assert(!_dlHandle);
+		_dlHandle = dlopen(_filename.c_str(), RTLD_LAZY);
+
+		if (!_dlHandle) {
+			warning("Failed loading plugin '%s' (%s)", _filename.c_str(), dlerror());
+			return false;
+		}
+
+		bool ret = DynamicPlugin::loadPlugin();
+
+		if (ret)
+			dlforgetsyms(_dlHandle);
+
+		return ret;
+	}
+
+	void unloadPlugin() {
+		DynamicPlugin::unloadPlugin();
+		if (_dlHandle) {
+			if (dlclose(_dlHandle) != 0)
+				warning("Failed unloading plugin '%s' (%s)", _filename.c_str(), dlerror());
+			_dlHandle = 0;
+		}
+	}
+};
+
+
+Plugin* PS2PluginProvider::createPlugin(const Common::FSNode &node) const {
+	return new PS2Plugin(node.getPath());
+}
+
+bool PS2PluginProvider::isPluginFilename(const Common::FSNode &node) const {
+	// Check the plugin suffix
+	Common::String filename = node.getName();
+	fprintf(stderr, "Testing name %s", filename.c_str());
+	if (!filename.hasSuffix(".PLG") && !filename.hasSuffix(".plg")) {
+		fprintf(stderr," fail.\n");
+		return false;
+	}
+
+	fprintf(stderr," success!\n");
+	return true;
+}
+
+#endif // defined(DYNAMIC_MODULES) && defined(__PS2__)

backends/plugins/ps2/ps2-provider.h

@@ -0,0 +1,18 @@
+#ifndef BACKENDS_PLUGINS_PS2_PS2_PROVIDER_H
+#define BACKENDS_PLUGINS_PS2_PS2_PROVIDER_H
+
+#include "base/plugins.h"
+
+#if defined(DYNAMIC_MODULES) && defined(__PS2__)
+
+class PS2PluginProvider : public FilePluginProvider {
+protected:
+	Plugin* createPlugin(const Common::FSNode &node) const;
+
+	bool isPluginFilename(const Common::FSNode &node) const;
+
+};
+
+#endif // defined(DYNAMIC_MODULES) && defined(__PS2__)
+
+#endif /* BACKENDS_PLUGINS_PS2_PS2_PROVIDER_H */