1 /* 2 * Copyright (c) 2000, 2013, 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 4563125 26 * @summary Test size method of FileChannel 27 * @run main/othervm Size 28 * @key randomness 29 */ 30 31 import java.io.*; 32 import java.nio.MappedByteBuffer; 33 import java.nio.channels.*; 34 import java.util.Random; 35 36 37 /** 38 * Testing FileChannel's size method. 39 */ 40 41 public class Size { 42 43 public static void main(String[] args) throws Exception { 44 testSmallFile(); 45 testLargeFile(); 46 } 47 48 private static void testSmallFile() throws Exception { 49 File smallFile = new File("smallFileTest"); 50 Random generator = new Random(); 51 for(int i=0; i<100; i++) { 52 long testSize = generator.nextInt(1000); 53 initTestFile(smallFile, testSize); 54 try (FileChannel c = new FileInputStream(smallFile).getChannel()) { 55 if (c.size() != testSize) { 56 throw new RuntimeException("Size failed in testSmallFile. " 57 + "Expect size " + testSize 58 + ", actual size " + c.size()); 59 } 60 } 61 } 62 smallFile.deleteOnExit(); 63 } 64 65 // Test for bug 4563125 66 private static void testLargeFile() throws Exception { 67 File largeFile = new File("largeFileTest"); 68 long testSize = ((long)Integer.MAX_VALUE) * 2; 69 initTestFile(largeFile, 10); 70 try (FileChannel fc = new RandomAccessFile(largeFile, "rw").getChannel()) 71 { 72 fc.size(); 73 fc.map(FileChannel.MapMode.READ_WRITE, testSize, 10); 74 if (fc.size() != testSize + 10) { 75 throw new RuntimeException("Size failed in testLargeFile. " 76 + "Expect size " + (testSize + 10) 77 + ", actual size " + fc.size()); 78 } 79 } 80 largeFile.deleteOnExit(); 81 } 82 83 /** 84 * Create a file with the specified size in bytes. 85 * 86 */ 87 private static void initTestFile(File f, long size) throws Exception { 88 try (BufferedWriter awriter = new BufferedWriter( 89 new OutputStreamWriter(new FileOutputStream(f), "8859_1"))) 90 { 91 for(int i=0; i<size; i++) { 92 awriter.write("e"); 93 } 94 } 95 } 96 }