| /* |
| * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test 1.1 98/01/12 |
| * @bug 4022294 |
| * @summary Test bufferedinputstream for data loss during skip |
| * |
| */ |
| |
| import java.io.*; |
| import java.util.*; |
| |
| /** |
| * This class tests to see if bufferinputstream can be reset |
| * to recover data that was skipped over when the buffer did |
| * not contain all the bytes to be skipped |
| */ |
| public class SkipTest { |
| |
| public static void main(String[] args) throws Exception { |
| long skipped = 0; |
| |
| // Create a tiny buffered stream so it can be easily |
| // set up to contain only some of the bytes to skip |
| DataSupplier source = new DataSupplier(); |
| BufferedInputStream in = new BufferedInputStream(source, 4); |
| |
| // Set up data to be skipped and recovered |
| // the skip must be longer than the buffer size |
| in.mark(30); |
| while (skipped < 15) { |
| skipped += in.skip(15-skipped); |
| } |
| int nextint = in.read(); |
| in.reset(); |
| |
| // Resume reading and see if data was lost |
| nextint = in.read(); |
| |
| if (nextint != 'a') |
| throw new RuntimeException("BufferedInputStream skip lost data"); |
| } |
| } |
| |
| |
| class DataSupplier extends InputStream { |
| |
| private int aposition=0; |
| |
| public int read() { |
| return 'x'; |
| } |
| |
| public long skip(long n) { |
| aposition += (int) n; |
| return n; |
| } |
| |
| public static final byte[] buffer = {(byte)'a',(byte)'b',(byte)'c', |
| (byte)'d',(byte)'e',(byte)'f',(byte)'g',(byte)'h',(byte)'i', |
| (byte)'j',(byte)'k',(byte)'l',(byte)'m',(byte)'n',(byte)'o', |
| (byte)'p',(byte)'q',(byte)'r',(byte)'s',(byte)'t',(byte)'u', |
| (byte)'v',(byte)'w',(byte)'x',(byte)'y',(byte)'z' |
| }; |
| |
| public int read(byte b[]) throws IOException { |
| return read(b, 0, b.length); |
| } |
| |
| public int read(byte b[], int off, int len) throws IOException { |
| if (len > buffer.length) len = buffer.length; |
| System.arraycopy(buffer, aposition, b, off, len); |
| return len; |
| } |
| |
| } |