1 /*
   2  * Copyright (c) 1997, 2016, 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.FilterInputStream;
  36 import java.io.IOException;
  37 import java.io.InputStream;
  38 
  39 /**
  40  * InputStream that keeps track of total bytes read (in effect
  41  * 'position' in stream) from the input stream.
  42  *
  43  */
  44 public class PositionInputStream extends FilterInputStream {
  45     private long position = 0L;
  46 
  47     public PositionInputStream(InputStream in) {
  48         super(in);
  49     }
  50 
  51     public int read() throws IOException {
  52         int res = super.read();
  53         if (res != -1) position++;
  54         return res;
  55     }
  56 
  57     public int read(byte[] b, int off, int len) throws IOException {
  58         int res = super.read(b, off, len);
  59         if (res != -1) position += res;
  60         return res;
  61     }
  62 
  63     public long skip(long n) throws IOException {
  64         long res = super.skip(n);
  65         position += res;
  66         return res;
  67     }
  68 
  69     public boolean markSupported() {
  70         return false;
  71     }
  72 
  73     public void mark(int readLimit) {
  74         throw new UnsupportedOperationException("mark");
  75     }
  76 
  77     public void reset() {
  78         throw new UnsupportedOperationException("reset");
  79     }
  80 
  81     public long position() {
  82         return position;
  83     }
  84 }