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