--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/server/InclusiveByteRange.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,227 @@
+//
+//  ========================================================================
+//  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.server;
+
+import java.util.Enumeration;
+import java.util.List;
+import java.util.StringTokenizer;
+
+import org.eclipse.jetty.util.LazyList;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+/* ------------------------------------------------------------ */
+/** Byte range inclusive of end points.
+ * <PRE>
+ * 
+ *   parses the following types of byte ranges:
+ * 
+ *       bytes=100-499
+ *       bytes=-300
+ *       bytes=100-
+ *       bytes=1-2,2-3,6-,-2
+ *
+ *   given an entity length, converts range to string
+ * 
+ *       bytes 100-499/500
+ * 
+ * </PRE>
+ * 
+ * Based on RFC2616 3.12, 14.16, 14.35.1, 14.35.2
+ * @version $version$
+ * 
+ */
+public class InclusiveByteRange 
+{
+    private static final Logger LOG = Log.getLogger(InclusiveByteRange.class);
+
+    long first = 0;
+    long last  = 0;    
+
+    public InclusiveByteRange(long first, long last)
+    {
+        this.first = first;
+        this.last = last;
+    }
+    
+    public long getFirst()
+    {
+        return first;
+    }
+
+    public long getLast()
+    {
+        return last;
+    }    
+
+
+    
+    /* ------------------------------------------------------------ */
+    /** 
+     * @param headers Enumeration of Range header fields.
+     * @param size Size of the resource.
+     * @return LazyList of satisfiable ranges
+     */
+    public static List satisfiableRanges(Enumeration headers, long size)
+    {
+        Object satRanges=null;
+        
+        // walk through all Range headers
+    headers:
+        while (headers.hasMoreElements())
+        {
+            String header = (String) headers.nextElement();
+            StringTokenizer tok = new StringTokenizer(header,"=,",false);
+            String t=null;
+            try
+            {
+                // read all byte ranges for this header 
+                while (tok.hasMoreTokens())
+                {
+                    try
+                    {
+                        t = tok.nextToken().trim();
+
+                        long first = -1;
+                        long last = -1;
+                        int d = t.indexOf('-');
+                        if (d < 0 || t.indexOf("-",d + 1) >= 0)
+                        {
+                            if ("bytes".equals(t))
+                                continue;
+                            LOG.warn("Bad range format: {}",t);
+                            continue headers;
+                        }
+                        else if (d == 0)
+                        {
+                            if (d + 1 < t.length())
+                                last = Long.parseLong(t.substring(d + 1).trim());
+                            else
+                            {
+                                LOG.warn("Bad range format: {}",t);
+                                continue;
+                            }
+                        }
+                        else if (d + 1 < t.length())
+                        {
+                            first = Long.parseLong(t.substring(0,d).trim());
+                            last = Long.parseLong(t.substring(d + 1).trim());
+                        }
+                        else
+                            first = Long.parseLong(t.substring(0,d).trim());
+
+                        if (first == -1 && last == -1)
+                            continue headers;
+
+                        if (first != -1 && last != -1 && (first > last))
+                            continue headers;
+
+                        if (first < size)
+                        {
+                            InclusiveByteRange range = new InclusiveByteRange(first,last);
+                            satRanges = LazyList.add(satRanges,range);
+                        }
+                    }
+                    catch (NumberFormatException e)
+                    {
+                        LOG.warn("Bad range format: {}",t);
+                        LOG.ignore(e);
+                        continue;
+                    }
+                }
+            }
+            catch(Exception e)
+            {
+                LOG.warn("Bad range format: {}",t);
+                LOG.ignore(e);
+            }    
+        }
+        return LazyList.getList(satRanges,true);
+    }
+
+    /* ------------------------------------------------------------ */
+    public long getFirst(long size)
+    {
+        if (first<0)
+        {
+            long tf=size-last;
+            if (tf<0)
+                tf=0;
+            return tf;
+        }
+        return first;
+    }
+    
+    /* ------------------------------------------------------------ */
+    public long getLast(long size)
+    {
+        if (first<0)
+            return size-1;
+        
+        if (last<0 ||last>=size)
+            return size-1;
+        return last;
+    }
+    
+    /* ------------------------------------------------------------ */
+    public long getSize(long size)
+    {
+        return getLast(size)-getFirst(size)+1;
+    }
+
+
+    /* ------------------------------------------------------------ */
+    public String toHeaderRangeString(long size)
+    {
+        StringBuilder sb = new StringBuilder(40);
+        sb.append("bytes ");
+        sb.append(getFirst(size));
+        sb.append('-');
+        sb.append(getLast(size));
+        sb.append("/");
+        sb.append(size);
+        return sb.toString();
+    }
+
+    /* ------------------------------------------------------------ */
+    public static String to416HeaderRangeString(long size)
+    {
+        StringBuilder sb = new StringBuilder(40);
+        sb.append("bytes */");
+        sb.append(size);
+        return sb.toString();
+    }
+
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public String toString()
+    {
+        StringBuilder sb = new StringBuilder(60);
+        sb.append(Long.toString(first));
+        sb.append(":");
+        sb.append(Long.toString(last));
+        return sb.toString();
+    }
+
+
+}
+
+
+