1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 
  27 /*
  28  * The Original Code is HAT. The Initial Developer of the
  29  * Original Code is Bill Foote, with contributions from others
  30  * at JavaSoft/Sun.
  31  */
  32 
  33 package jdk.test.lib.hprof.parser;
  34 
  35 import java.io.DataInputStream;
  36 import java.io.InputStream;
  37 
  38 /**
  39  * A DataInputStream that keeps track of total bytes read
  40  * (in effect 'position' in stream) so far.
  41  *
  42  */
  43 public class PositionDataInputStream extends DataInputStream {
  44     public PositionDataInputStream(InputStream in) {
  45         super(in instanceof PositionInputStream?
  46               in : new PositionInputStream(in));
  47     }
  48 
  49     public boolean markSupported() {
  50         return false;
  51     }
  52 
  53     public void mark(int readLimit) {
  54         throw new UnsupportedOperationException("mark");
  55     }
  56 
  57     public void reset() {
  58         throw new UnsupportedOperationException("reset");
  59     }
  60 
  61     public long position() {
  62         return ((PositionInputStream)in).position();
  63     }
  64 }