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