diff -r fd16c54261b3 -r 90ce3da70b43 jdk/test/java/io/BufferedInputStream/SkipTest.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/jdk/test/java/io/BufferedInputStream/SkipTest.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,97 @@ +/* + * Copyright 1998 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.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; + } + +}