1 /* 2 * Copyright (c) 2010, 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 /* 25 * @test 26 * @bug 6402006 7030573 8011136 27 * @key intermittent 28 * @summary Test if available returns correct value when reading 29 * a large file. 30 */ 31 32 import java.io.*; 33 import java.nio.ByteBuffer; 34 import java.nio.channels.*; 35 import java.nio.file.Files; 36 import static java.nio.file.StandardOpenOption.*; 37 38 public class LargeFileAvailable { 39 public static void main(String args[]) throws Exception { 40 // Create a temporary file in the current directory. 41 // Use it to check if we have 7G available for 42 // a large sparse file test. As a fallback use whatever 43 // space is available, so the test can proceed. 44 File file = File.createTempFile("largefile", null, new File(".")); 45 long spaceavailable = file.getUsableSpace(); 46 long filesize = Math.min(spaceavailable, 7405576182L); 47 if (spaceavailable == 0L) { 48 // A full disk is considered fatal. 49 throw new RuntimeException("No space available for temp file."); 50 } 51 52 createLargeFile(filesize, file); 53 54 try (FileInputStream fis = new FileInputStream(file)) { 55 if (file.length() != filesize) { 56 throw new RuntimeException("unexpected file size = " 57 + file.length()); 58 } 59 60 long bigSkip = Math.min(filesize/2, 3110608882L); 61 long remaining = filesize; 62 remaining -= skipBytes(fis, bigSkip, remaining); 63 remaining -= skipBytes(fis, 10L, remaining); 64 remaining -= skipBytes(fis, bigSkip, remaining); 65 int expected = (remaining >= Integer.MAX_VALUE) 66 ? Integer.MAX_VALUE 67 : (remaining > 0 ? (int) remaining : 0); 68 if (fis.available() != expected) { 69 throw new RuntimeException("available() returns " 70 + fis.available() + " but expected " + expected); 71 } 72 } finally { 73 file.delete(); 74 } 75 76 System.out.println("Test succeeded."); 77 System.out.flush(); 78 } 79 80 // Skip toSkip number of bytes and expect that the available() method 81 // returns avail number of bytes. 82 private static long skipBytes(InputStream is, long toSkip, long avail) 83 throws IOException { 84 long skip = is.skip(toSkip); 85 if (skip != toSkip) { 86 throw new RuntimeException("skip() returns " + skip 87 + " but expected " + toSkip); 88 } 89 long remaining = avail - skip; 90 int expected = (remaining >= Integer.MAX_VALUE) 91 ? Integer.MAX_VALUE 92 : (remaining > 0 ? (int) remaining : 0); 93 94 System.out.println("Skipped " + skip + " bytes, available() returns " 95 + expected + ", remaining " + remaining); 96 if (is.available() != expected) { 97 throw new RuntimeException("available() returns " 98 + is.available() + " but expected " + expected); 99 } 100 return skip; 101 } 102 103 private static void createLargeFile(long filesize, 104 File file) throws Exception { 105 // Recreate a large file as a sparse file if possible 106 Files.delete(file.toPath()); 107 108 try (FileChannel fc = 109 FileChannel.open(file.toPath(), 110 CREATE_NEW, WRITE, SPARSE)) { 111 ByteBuffer bb = ByteBuffer.allocate(1).put((byte)1); 112 bb.rewind(); 113 int rc = fc.write(bb, filesize - 1); 114 115 if (rc != 1) { 116 throw new RuntimeException("Failed to write 1 byte" 117 + " to the large file"); 118 } 119 } 120 return; 121 } 122 }