adding missing files

org.eclipse.fx.drift/src/main/java/org/eclipse/fx/drift/util/ManifestUtil.java

@@ -0,0 +1,37 @@
+package org.eclipse.fx.drift.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.eclipse.fx.drift.internal.Versioning;
+
+public class ManifestUtil {
+
+	private static URL getManifestUrl(Class<?> cls) {
+		try {
+			String shortName = cls.getSimpleName() + ".class";
+			String fullPath = cls.getName().replace('/', '.') + ".class";
+			URL clsUrl = Versioning.class.getResource(shortName);
+			return new URL(clsUrl.toString().replace(fullPath, "META-INF/MANIFEST.MF"));
+		}
+		catch (MalformedURLException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public static String getManifestEntry(Class<?> context, String name) {
+		URL manifestUrl = getManifestUrl(context);
+		try (InputStream in = manifestUrl.openStream()) {
+			Manifest manifest = new Manifest(in);
+			Attributes attrs = manifest.getMainAttributes();
+			return attrs.getValue(name);
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+}

org.eclipse.fx.drift/src/main/java/org/eclipse/fx/drift/util/NativeUtil.java

@@ -0,0 +1,93 @@
+package org.eclipse.fx.drift.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.eclipse.fx.drift.internal.Log;
+import org.eclipse.fx.drift.internal.Versioning;
+
+public class NativeUtil {
+
+	private static final boolean USE_JAVA_LIBRARY_PATH = Boolean.getBoolean("driftfx.use.java.library.path");
+
+	private static String OS = null;
+
+	static boolean osgi = false;
+
+	public static void useOsgiEnvironment() {
+		osgi = true;
+	}
+
+	public static String getOsName() {
+		if (OS == null) {
+			OS = System.getProperty("os.name");
+		}
+		return OS;
+	}
+
+	public static boolean isWindows() {
+		return getOsName().toLowerCase().contains("windows");
+	}
+
+	public static boolean isLinux() {
+		return getOsName().toLowerCase().contains("linux");
+	}
+
+	public static boolean isMacOs() {
+		return getOsName().toLowerCase().contains("mac");
+	}
+
+	public static void loadLibrary(Class<?> context, String libname) {
+		if (USE_JAVA_LIBRARY_PATH || osgi) {
+			// osgi will take care of it
+			System.loadLibrary(libname);
+		}
+		else {
+			// we need to make it happen
+
+			String filename = getFilename(libname);
+			Path tmpDir = Paths.get(System.getProperty("java.io.tmpdir"));
+			Path extractPath = tmpDir.resolve("driftfx").resolve(ManifestUtil.getManifestEntry(context, "Bundle-Version")).resolve(filename);
+
+			String resourceName = "/native/" + filename;
+			URL url = context.getResource(resourceName);
+			Log.debug("Resource Lookup: name: " + resourceName + ", context: " + context + " => " + url);
+
+			try (InputStream in = context.getResourceAsStream("/native/" + filename)) {
+				extract(in, extractPath);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+
+			System.load(extractPath.toString());
+		}
+	}
+
+    private static Path extract(InputStream in, Path extractPath) throws IOException {
+        Files.createDirectories(extractPath.getParent());
+        if (!Files.exists(extractPath)) {
+            long bytes = Files.copy(in, extractPath);
+            if (bytes == 0) {
+                throw new IOException("library has no size!");
+            }
+        }
+        return extractPath;
+    }
+
+	private static String getFilename(String libname) {
+		if (isWindows()) {
+			return libname + ".dll";
+		}
+		if (isLinux()) {
+			return "lib" + libname + ".so";
+		}
+		if (isMacOs()) {
+			return "lib" + libname + ".dylib";
+		}
+		throw new RuntimeException("os not supported: " + getOsName());
+	}
+}