Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.lz4 / src / net / jpountz / util / Native.java

diff --git a/bundles/org.simantics.lz4/src/net/jpountz/util/Native.java b/bundles/org.simantics.lz4/src/net/jpountz/util/Native.java
new file mode 100644 (file)
index 0000000..c793f89
--- /dev/null
+++ b/bundles/org.simantics.lz4/src/net/jpountz/util/Native.java
@@ -0,0 +1,123 @@
+package net.jpountz.util;
+
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/** FOR INTERNAL USE ONLY */
+public enum Native {
+  ;
+
+  private enum OS {
+    // Even on Windows, the default compiler from cpptasks (gcc) uses .so as a shared lib extension
+    WINDOWS("win32", "dll"), LINUX("linux", "so"), MAC("darwin", "dylib"), SOLARIS("solaris", "so");
+    public final String name, libExtension;
+
+    private OS(String name, String libExtension) {
+      this.name = name;
+      this.libExtension = libExtension;
+    }
+  }
+
+  private static String arch() {
+    return System.getProperty("os.arch");
+  }
+
+  private static OS os() {
+    String osName = System.getProperty("os.name");
+    if (osName.contains("Linux")) {
+      return OS.LINUX;
+    } else if (osName.contains("Mac")) {
+      return OS.MAC;
+    } else if (osName.contains("Windows")) {
+      return OS.WINDOWS;
+    } else if (osName.contains("Solaris") || osName.contains("SunOS")) {
+      return OS.SOLARIS;
+    } else {
+      throw new UnsupportedOperationException("Unsupported operating system: "
+          + osName);
+    }
+  }
+
+  private static String resourceName() {
+    OS os = os();
+    String packagePrefix = Native.class.getPackage().getName().replace('.', '/');
+
+    return "/" + packagePrefix + "/" + os.name + "/" + arch() + "/liblz4-java." + os.libExtension;
+  }
+
+  private static boolean loaded = false;
+
+  public static synchronized boolean isLoaded() {
+    return loaded;
+  }
+
+  public static synchronized void load() {
+    if (loaded) {
+      return;
+    }
+    String resourceName = resourceName();
+    InputStream is = Native.class.getResourceAsStream(resourceName);
+    if (is == null) {
+      throw new UnsupportedOperationException("Unsupported OS/arch, cannot find " + resourceName + ". Please try building from source.");
+    }
+    File tempLib;
+    try {
+      tempLib = File.createTempFile("liblz4-java", "." + os().libExtension);
+      // copy to tempLib
+      FileOutputStream out = new FileOutputStream(tempLib);
+      try {
+        byte[] buf = new byte[4096];
+        while (true) {
+          int read = is.read(buf);
+          if (read == -1) {
+            break;
+          }
+          out.write(buf, 0, read);
+        }
+        try {
+          out.close();
+          out = null;
+        } catch (IOException e) {
+          // ignore
+        }
+        System.load(tempLib.getAbsolutePath());
+        loaded = true;
+      } finally {
+        try {
+          if (out != null) {
+            out.close();
+          }
+        } catch (IOException e) {
+          // ignore
+        }
+        if (tempLib != null && tempLib.exists()) {
+          if (!loaded) {
+            tempLib.delete();
+          } else {
+            // try to delete on exit, does it work on Windows?
+            tempLib.deleteOnExit();
+          }
+        }
+      }
+    } catch (IOException e) {
+        throw new ExceptionInInitializerError("Cannot unpack liblz4-java");
+    }
+  }
+
+}