1 /* 2 * Copyright (c) 2020, 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 /* @test 25 * @bug 8230665 26 * @summary Test correct behavior of alignmentOffset() 27 */ 28 29 import java.io.IOException; 30 import java.nio.MappedByteBuffer; 31 import java.nio.channels.FileChannel; 32 import java.nio.file.Files; 33 import java.nio.file.Path; 34 35 public class AlignmentOffset { 36 37 public static void main(String[] args) throws Throwable { 38 test(); 39 } 40 41 private static void test() throws IOException { 42 MappedByteBuffer[] mbb = buffers(); 43 int failures = 0; 44 for (MappedByteBuffer bb : mbb) { 45 try { 46 int offset = bb.alignmentOffset(1, 4); 47 if (offset >= 0) { 48 System.out.println("PASSED"); 49 } else { 50 System.err.println("FAILED "+offset); 51 failures++; 52 } 53 } catch (UnsupportedOperationException e) { 54 System.out.println("Not applicable, UOE thrown: "); 55 } 56 } 57 if (failures > 0) { 58 throw new RuntimeException("Test failed"); 59 } 60 } 61 62 private static MappedByteBuffer[] buffers() throws IOException { 63 return new MappedByteBuffer[]{ 64 createMBB(new byte[]{0, 1, 2, 3}), 65 createMBB(new byte[]{0, 1, 2, -3, 66 45, 6, 7, 78, 3, -7, 6, 7, -128, 127}), 67 }; 68 } 69 70 private static MappedByteBuffer createMBB(byte[] contents) 71 throws IOException { 72 Path tempFile = Files.createTempFile("mbb", null); 73 tempFile.toFile().deleteOnExit(); 74 Files.write(tempFile, contents); 75 try (FileChannel fc = FileChannel.open(tempFile)) { 76 MappedByteBuffer map = 77 fc.map(FileChannel.MapMode.READ_ONLY, 0, contents.length); 78 map.load(); 79 return map; 80 } 81 } 82 }