| /* |
| * Copyright (c) 2010, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6402006 7030573 8011136 |
| * @summary Test if available returns correct value when reading |
| * a large file. |
| * @run main/timeout=300 LargeFileAvailable |
| */ |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.*; |
| import java.nio.file.Files; |
| import static java.nio.file.StandardOpenOption.*; |
| import java.util.concurrent.TimeUnit; |
| |
| public class LargeFileAvailable { |
| public static void main(String args[]) throws Exception { |
| // Create a temporary file in the current directory. |
| // Use it to check if we have 7G available for |
| // a large sparse file test. As a fallback use whatever |
| // space is available, so the test can proceed. |
| File file = File.createTempFile("largefile", null, new File(".")); |
| long spaceavailable = file.getUsableSpace(); |
| long filesize = Math.min(spaceavailable, 7405576182L); |
| if (spaceavailable == 0L) { |
| // A full disk is considered fatal. |
| throw new RuntimeException("No space available for temp file."); |
| } |
| |
| createLargeFile(filesize, file); |
| |
| try (FileInputStream fis = new FileInputStream(file)) { |
| if (file.length() != filesize) { |
| throw new RuntimeException("unexpected file size = " |
| + file.length()); |
| } |
| |
| long bigSkip = Math.min(filesize/2, 3110608882L); |
| long remaining = filesize; |
| remaining -= skipBytes(fis, bigSkip, remaining); |
| remaining -= skipBytes(fis, 10L, remaining); |
| remaining -= skipBytes(fis, bigSkip, remaining); |
| int expected = (remaining >= Integer.MAX_VALUE) |
| ? Integer.MAX_VALUE |
| : (remaining > 0 ? (int) remaining : 0); |
| if (fis.available() != expected) { |
| throw new RuntimeException("available() returns " |
| + fis.available() + " but expected " + expected); |
| } |
| } finally { |
| file.delete(); |
| } |
| |
| System.out.println("Test succeeded."); |
| System.out.flush(); |
| } |
| |
| // Skip toSkip number of bytes and expect that the available() method |
| // returns avail number of bytes. |
| private static long skipBytes(InputStream is, long toSkip, long avail) |
| throws IOException { |
| long skip = is.skip(toSkip); |
| if (skip != toSkip) { |
| throw new RuntimeException("skip() returns " + skip |
| + " but expected " + toSkip); |
| } |
| long remaining = avail - skip; |
| int expected = (remaining >= Integer.MAX_VALUE) |
| ? Integer.MAX_VALUE |
| : (remaining > 0 ? (int) remaining : 0); |
| |
| System.out.println("Skipped " + skip + " bytes, available() returns " |
| + expected + ", remaining " + remaining); |
| if (is.available() != expected) { |
| throw new RuntimeException("available() returns " |
| + is.available() + " but expected " + expected); |
| } |
| return skip; |
| } |
| |
| private static void createLargeFile(long filesize, |
| File file) throws Exception { |
| // Recreate a large file as a sparse file if possible |
| Files.delete(file.toPath()); |
| |
| try (FileChannel fc = |
| FileChannel.open(file.toPath(), |
| CREATE_NEW, WRITE, SPARSE)) { |
| ByteBuffer bb = ByteBuffer.allocate(1).put((byte)1); |
| bb.rewind(); |
| System.out.println(" Writing large file..."); |
| long t0 = System.nanoTime(); |
| int rc = fc.write(bb, filesize - 1); |
| long t1 = System.nanoTime(); |
| System.out.printf(" Wrote large file in %d ns (%d ms) %n", |
| t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0)); |
| |
| if (rc != 1) { |
| throw new RuntimeException("Failed to write 1 byte" |
| + " to the large file"); |
| } |
| } |
| return; |
| } |
| } |