| /* |
| * Copyright (c) 2010, 2011, 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 |
| * @summary Test if available returns correct value when reading |
| * a large file. |
| */ |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.*; |
| import java.nio.file.Files; |
| import static java.nio.file.StandardOpenOption.*; |
| |
| public class LargeFileAvailable { |
| private static final long FILESIZE = 7405576182L; |
| public static void main(String args[]) throws Exception { |
| File file = createLargeFile(FILESIZE); |
| try (FileInputStream fis = new FileInputStream(file)) { |
| if (file.length() != FILESIZE) { |
| throw new RuntimeException("unexpected file size = " + file.length()); |
| } |
| |
| long bigSkip = 3110608882L; |
| long remaining = FILESIZE; |
| remaining -= skipBytes(fis, bigSkip, remaining); |
| remaining -= skipBytes(fis, 10L, remaining); |
| remaining -= skipBytes(fis, bigSkip, remaining); |
| if (fis.available() != (int) remaining) { |
| throw new RuntimeException("available() returns " + |
| fis.available() + |
| " but expected " + remaining); |
| } |
| } finally { |
| file.delete(); |
| } |
| } |
| |
| // 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 |
| : (int) remaining; |
| |
| 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 File createLargeFile(long filesize) throws Exception { |
| // Create a large file as a sparse file if possible |
| File largefile = File.createTempFile("largefile", null); |
| // re-create as a sparse file |
| Files.delete(largefile.toPath()); |
| try (FileChannel fc = |
| FileChannel.open(largefile.toPath(), |
| CREATE_NEW, WRITE, SPARSE)) { |
| ByteBuffer bb = ByteBuffer.allocate(1).put((byte)1); |
| bb.rewind(); |
| int rc = fc.write(bb, filesize-1); |
| if (rc != 1) { |
| throw new RuntimeException("Failed to write 1 byte to the large file"); |
| } |
| } |
| return largefile; |
| } |
| } |