--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/io/AbstractBuffers.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,168 @@
+//
+//  ========================================================================
+//  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.io;
+
+import org.eclipse.jetty.io.nio.DirectNIOBuffer;
+import org.eclipse.jetty.io.nio.IndirectNIOBuffer;
+
+public abstract class AbstractBuffers implements Buffers
+{
+    protected final Buffers.Type _headerType;
+    protected final int _headerSize;
+    protected final Buffers.Type _bufferType;
+    protected final int _bufferSize;
+    protected final Buffers.Type _otherType;
+
+    /* ------------------------------------------------------------ */
+    public AbstractBuffers(Buffers.Type headerType, int headerSize, Buffers.Type bufferType, int bufferSize, Buffers.Type otherType)
+    {
+        _headerType=headerType;
+        _headerSize=headerSize;
+        _bufferType=bufferType;
+        _bufferSize=bufferSize;
+        _otherType=otherType;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the buffer size in bytes.
+     */
+    public int getBufferSize()
+    {
+        return _bufferSize;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the header size in bytes.
+     */
+    public int getHeaderSize()
+    {
+        return _headerSize;
+    }
+
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Create a new header Buffer
+     * @return new Buffer
+     */
+    final protected Buffer newHeader()
+    {
+        switch(_headerType)
+        {
+            case BYTE_ARRAY:
+                return new ByteArrayBuffer(_headerSize);
+            case DIRECT:
+                return new DirectNIOBuffer(_headerSize);
+            case INDIRECT:
+                return new IndirectNIOBuffer(_headerSize);
+        }
+        throw new IllegalStateException();
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Create a new content Buffer
+     * @return new Buffer
+     */
+    final protected Buffer newBuffer()
+    {
+       switch(_bufferType)
+       {
+           case BYTE_ARRAY:
+               return new ByteArrayBuffer(_bufferSize);
+           case DIRECT:
+               return new DirectNIOBuffer(_bufferSize);
+           case INDIRECT:
+               return new IndirectNIOBuffer(_bufferSize);
+       }
+       throw new IllegalStateException();
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Create a new content Buffer
+     * @param size
+     * @return new Buffer
+     */
+    final protected Buffer newBuffer(int size)
+    {
+       switch(_otherType)
+       {
+           case BYTE_ARRAY:
+               return new ByteArrayBuffer(size);
+           case DIRECT:
+               return new DirectNIOBuffer(size);
+           case INDIRECT:
+               return new IndirectNIOBuffer(size);
+       }
+       throw new IllegalStateException();
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @param buffer
+     * @return True if the buffer is the correct type to be a Header buffer
+     */
+    public final boolean isHeader(Buffer buffer)
+    {
+        if (buffer.capacity()==_headerSize)
+        {
+            switch(_headerType)
+            {
+                case BYTE_ARRAY:
+                    return buffer instanceof ByteArrayBuffer && !(buffer instanceof  IndirectNIOBuffer);
+                case DIRECT:
+                    return buffer instanceof  DirectNIOBuffer;
+                case INDIRECT:
+                    return buffer instanceof  IndirectNIOBuffer;
+            }
+        }
+        return false;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @param buffer
+     * @return True if the buffer is the correct type to be a Header buffer
+     */
+    public final boolean isBuffer(Buffer buffer)
+    {
+        if (buffer.capacity()==_bufferSize)
+        {
+            switch(_bufferType)
+            {
+                case BYTE_ARRAY:
+                    return buffer instanceof ByteArrayBuffer && !(buffer instanceof  IndirectNIOBuffer);
+                case DIRECT:
+                    return buffer instanceof  DirectNIOBuffer;
+                case INDIRECT:
+                    return buffer instanceof  IndirectNIOBuffer;
+            }
+        }
+        return false;
+    }
+
+    /* ------------------------------------------------------------ */
+    public String toString()
+    {
+        return String.format("%s [%d,%d]", getClass().getSimpleName(), _headerSize, _bufferSize);
+    }
+}