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diff --git a/tools/gnu/classpath/tools/javah/JniHelper.java b/tools/gnu/classpath/tools/javah/JniHelper.java
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+++ b/tools/gnu/classpath/tools/javah/JniHelper.java
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+/* JniHelper.java - name mangling and other JNI support 
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+ This file is part of GNU Classpath.
+
+ GNU Classpath 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, or (at your option)
+ any later version.
+
+ GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA.
+
+ Linking this library statically or dynamically with other modules is
+ making a combined work based on this library.  Thus, the terms and
+ conditions of the GNU General Public License cover the whole
+ combination.
+
+ As a special exception, the copyright holders of this library give you
+ permission to link this library with independent modules to produce an
+ executable, regardless of the license terms of these independent
+ modules, and to copy and distribute the resulting executable under
+ terms of your choice, provided that you also meet, for each linked
+ independent module, the terms and conditions of the license of that
+ module.  An independent module is a module which is not derived from
+ or based on this library.  If you modify this library, you may extend
+ this exception to your version of the library, but you are not
+ obligated to do so.  If you do not wish to do so, delete this
+ exception statement from your version. */
+
+
+package gnu.classpath.tools.javah;
+
+import java.io.IOException;
+
+import org.objectweb.asm.Type;
+
+public class JniHelper
+{
+  public static String getName(Main classpath, Type type) throws IOException
+  {
+    if (type == Type.BOOLEAN_TYPE)
+      return "jboolean";
+    else if (type == Type.BYTE_TYPE)
+      return "jbyte";
+    else if (type == Type.CHAR_TYPE)
+      return "jchar";
+    else if (type == Type.SHORT_TYPE)
+      return "jshort";
+    else if (type == Type.INT_TYPE)
+      return "jint";
+    else if (type == Type.LONG_TYPE)
+      return "jlong";
+    else if (type == Type.FLOAT_TYPE)
+      return "jfloat";
+    else if (type == Type.DOUBLE_TYPE)
+      return "jdouble";
+    else if (type == Type.VOID_TYPE)
+      return "void";
+
+    if (type.getSort() == Type.ARRAY)
+      {
+        Type elt = type.getElementType();
+        int eltSort = elt.getSort();
+        if (type.getDimensions() == 1 && eltSort != Type.OBJECT)
+          return getName(classpath, elt) + "Array";
+        return "jobjectArray";
+      }
+
+    // assert type.getSort() == Type.OBJECT;
+    String className = type.getClassName();
+    // FIXME: is this correct?
+    if (className.equals("java/lang/Class")
+        || className.equals("java.lang.Class"))
+      return "jclass";
+    if (className.equals("java/lang/String")
+        || className.equals("java.lang.String"))
+      return "jstring";
+
+    ClassWrapper klass = classpath.getClass(className);
+    if (klass.isThrowable())
+      return "jthrowable";
+    return "jobject";
+  }
+
+  public static String mangle(String name)
+  {
+    StringBuffer result = new StringBuffer();
+    for (int i = 0; i < name.length(); ++i)
+      {
+        char c = name.charAt(i);
+        if (c == '_')
+          result.append("_1");
+        else if (c == ';')
+          result.append("_2");
+        else if (c == '[')
+          result.append("_3");
+        else if (c == '/')
+          result.append("_");
+        else if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z')
+                 || (c >= 'A' && c <= 'Z'))
+          result.append(c);
+        else
+          {
+            result.append("_0");
+            // Sigh.
+            String hex = "0000" + Integer.toHexString(c);
+            result.append(hex.substring(hex.length() - 4));
+          }
+      }
+    return result.toString();
+  }
+}