1 /* 2 * Copyright (c) 2010, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 /* @test 26 * @bug 6720170 27 * @summary check for ByteArrayInputStream.skip 28 */ 29 30 import java.io.*; 31 32 public class Skip { 33 private static void dotest(InputStream in, int curpos, long total, 34 long toskip, long expected) 35 throws Exception 36 { 37 System.err.println("\nCurrently at pos = " + curpos + 38 "\nTotal bytes in the stream = " + total + 39 "\nNumber of bytes to skip = " + toskip + 40 "\nNumber of bytes that should be skipped = " + 41 expected); 42 43 // position to curpos; EOF if negative 44 in.reset(); 45 int avail = curpos >= 0 ? curpos : in.available(); 46 long n = in.skip(avail); 47 if (n != avail) { 48 throw new RuntimeException("Unexpected number of bytes skipped = " + n); 49 } 50 51 long skipped = in.skip(toskip); 52 System.err.println("actual number skipped: "+ skipped); 53 54 if (skipped != expected) { 55 throw new RuntimeException("Unexpected number of bytes skipped = " + skipped); 56 } 57 } 58 59 public static void main(String argv[]) throws Exception { 60 int total = 1024; 61 ByteArrayInputStream in = new ByteArrayInputStream(new byte[total]); 62 63 /* test for skip */ 64 dotest(in, 0, total, 23, 23); 65 dotest(in, 10, total, 23, 23); 66 67 /* test for negative skip */ 68 dotest(in, 0, total, -23, 0); 69 70 /* check for skip after EOF */ 71 dotest(in, -1, total, 20, 0); 72 73 /* check for skip beyond EOF starting from before EOF */ 74 dotest(in, 0, total, total+20, total); 75 76 /* check for skip if the pos + toskip causes integer overflow */ 77 dotest(in, 10, total, Long.MAX_VALUE, total-10); 78 } 79 }