--- /dev/null
+//
+// ========================================================================
+// 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
+ * <p>
+ * And yes the spec does strangely say that while 10-20, is bytes 10 to 20 and 10- is bytes 10 until the end that -20 IS NOT bytes 0-20, but the last 20 bytes of the content.
+ *
+ * @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<InclusiveByteRange> 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();
+ }
+
+
+}
+
+
+
projects / gigi.git / blobdiff