| /* |
| * Copyright (c) 2010, 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 |
| * @bug 6720170 |
| * @summary check for ByteArrayInputStream.skip |
| */ |
| |
| import java.io.*; |
| |
| public class Skip { |
| private static void dotest(InputStream in, int curpos, long total, |
| long toskip, long expected) |
| throws Exception |
| { |
| System.err.println("\nCurrently at pos = " + curpos + |
| "\nTotal bytes in the stream = " + total + |
| "\nNumber of bytes to skip = " + toskip + |
| "\nNumber of bytes that should be skipped = " + |
| expected); |
| |
| // position to curpos; EOF if negative |
| in.reset(); |
| int avail = curpos >= 0 ? curpos : in.available(); |
| long n = in.skip(avail); |
| if (n != avail) { |
| throw new RuntimeException("Unexpected number of bytes skipped = " + n); |
| } |
| |
| long skipped = in.skip(toskip); |
| System.err.println("actual number skipped: "+ skipped); |
| |
| if (skipped != expected) { |
| throw new RuntimeException("Unexpected number of bytes skipped = " + skipped); |
| } |
| } |
| |
| public static void main(String argv[]) throws Exception { |
| int total = 1024; |
| ByteArrayInputStream in = new ByteArrayInputStream(new byte[total]); |
| |
| /* test for skip */ |
| dotest(in, 0, total, 23, 23); |
| dotest(in, 10, total, 23, 23); |
| |
| /* test for negative skip */ |
| dotest(in, 0, total, -23, 0); |
| |
| /* check for skip after EOF */ |
| dotest(in, -1, total, 20, 0); |
| |
| /* check for skip beyond EOF starting from before EOF */ |
| dotest(in, 0, total, total+20, total); |
| |
| /* check for skip if the pos + toskip causes integer overflow */ |
| dotest(in, 10, total, Long.MAX_VALUE, total-10); |
| } |
| } |