--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/util/Utf8StringBuffer.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,75 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.util;
+
+/* ------------------------------------------------------------ */
+/**
+ * UTF-8 StringBuffer.
+ *
+ * This class wraps a standard {@link java.lang.StringBuffer} and provides methods to append
+ * UTF-8 encoded bytes, that are converted into characters.
+ *
+ * This class is stateful and up to 4 calls to {@link #append(byte)} may be needed before
+ * state a character is appended to the string buffer.
+ *
+ * The UTF-8 decoding is done by this class and no additional buffers or Readers are used.
+ * The UTF-8 code was inspired by http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
+ */
+public class Utf8StringBuffer extends Utf8Appendable
+{
+    final StringBuffer _buffer;
+
+    public Utf8StringBuffer()
+    {
+        super(new StringBuffer());
+        _buffer = (StringBuffer)_appendable;
+    }
+
+    public Utf8StringBuffer(int capacity)
+    {
+        super(new StringBuffer(capacity));
+        _buffer = (StringBuffer)_appendable;
+    }
+
+    @Override
+    public int length()
+    {
+        return _buffer.length();
+    }
+
+    @Override
+    public void reset()
+    {
+        super.reset();
+        _buffer.setLength(0);
+    }
+
+    public StringBuffer getStringBuffer()
+    {
+        checkState();
+        return _buffer;
+    }
+
+    @Override
+    public String toString()
+    {
+        checkState();
+        return _buffer.toString();
+    }
+}