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 }