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diff --git a/libjava/classpath/gnu/java/nio/charset/US_ASCII.java b/libjava/classpath/gnu/java/nio/charset/US_ASCII.java
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+++ b/libjava/classpath/gnu/java/nio/charset/US_ASCII.java
@@ -0,0 +1,161 @@
+/* US_ASCII.java -- 
+   Copyright (C) 2002, 2004, 2005 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.java.nio.charset;
+
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.CharsetEncoder;
+import java.nio.charset.CoderResult;
+
+/**
+ * US-ASCII charset.
+ *
+ * @author Jesse Rosenstock
+ */
+final class US_ASCII extends Charset
+{
+  US_ASCII ()
+  {
+    /* Canonical charset name chosen according to:
+     * http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html
+     */
+    super ("US-ASCII", new String[] {
+        /* These names are provided by 
+         * http://www.iana.org/assignments/character-sets
+         */
+        "iso-ir-6",
+        "ANSI_X3.4-1986",
+        "ISO_646.irv:1991",
+        "ASCII",
+        "ISO646-US",
+        "ASCII",
+        "us",
+        "IBM367",
+        "cp367",
+        "csASCII",
+        /* These names are provided by
+         * http://oss.software.ibm.com/cgi-bin/icu/convexp?s=ALL
+         */
+        "ANSI_X3.4-1968", "iso_646.irv:1983", "ascii7", "646",
+        "windows-20127"
+        });
+  }
+
+  public boolean contains (Charset cs)
+  {
+    return cs instanceof US_ASCII;
+  }
+
+  public CharsetDecoder newDecoder ()
+  {
+    return new Decoder (this);
+  }
+
+  public CharsetEncoder newEncoder ()
+  {
+    return new Encoder (this);
+  }
+
+  private static final class Decoder extends CharsetDecoder
+  {
+    // Package-private to avoid a trampoline constructor.
+    Decoder (Charset cs)
+    {
+      super (cs, 1.0f, 1.0f);
+    }
+
+    protected CoderResult decodeLoop (ByteBuffer in, CharBuffer out)
+    {
+      // TODO: Optimize this in the case in.hasArray() / out.hasArray()
+      while (in.hasRemaining ())
+        {
+          byte b = in.get ();
+
+          if (b < 0)
+            {
+              in.position (in.position () - 1);
+              return CoderResult.malformedForLength (1);
+            }
+          if (!out.hasRemaining ())
+            {
+              in.position (in.position () - 1);
+              return CoderResult.OVERFLOW;
+            }
+
+          out.put ((char) b);
+        }
+
+      return CoderResult.UNDERFLOW;
+    }
+  }
+
+  private static final class Encoder extends CharsetEncoder
+  {
+    // Package-private to avoid a trampoline constructor.
+    Encoder (Charset cs)
+    {
+      super (cs, 1.0f, 1.0f);
+    }
+
+    protected CoderResult encodeLoop (CharBuffer in, ByteBuffer out)
+    {
+      // TODO: Optimize this in the case in.hasArray() / out.hasArray()
+      while (in.hasRemaining ())
+      {
+        char c = in.get ();
+
+        if (c > Byte.MAX_VALUE)
+          {
+            in.position (in.position () - 1);
+            return CoderResult.unmappableForLength (1);
+          }
+        if (!out.hasRemaining ())
+          {
+            in.position (in.position () - 1);
+            return CoderResult.OVERFLOW;
+          }
+
+        out.put ((byte) c);
+      }
+
+      return CoderResult.UNDERFLOW;
+    }
+  }
+}