1 /*
2 * Copyright (c) 1994, 2017, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.io;
27
28 import java.nio.channels.FileChannel;
29 import java.util.concurrent.atomic.AtomicBoolean;
30 import jdk.internal.misc.JavaIORandomAccessFileAccess;
31 import jdk.internal.misc.SharedSecrets;
32 import sun.nio.ch.FileChannelImpl;
33
34
35 /**
36 * Instances of this class support both reading and writing to a
37 * random access file. A random access file behaves like a large
38 * array of bytes stored in the file system. There is a kind of cursor,
39 * or index into the implied array, called the <em>file pointer</em>;
40 * input operations read bytes starting at the file pointer and advance
41 * the file pointer past the bytes read. If the random access file is
42 * created in read/write mode, then output operations are also available;
43 * output operations write bytes starting at the file pointer and advance
44 * the file pointer past the bytes written. Output operations that write
45 * past the current end of the implied array cause the array to be
46 * extended. The file pointer can be read by the
47 * {@code getFilePointer} method and set by the {@code seek}
48 * method.
49 * <p>
50 * It is generally true of all the reading routines in this class that
51 * if end-of-file is reached before the desired number of bytes has been
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1 /*
2 * Copyright (c) 1994, 2018, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.io;
27
28 import java.nio.channels.FileChannel;
29 import java.util.concurrent.atomic.AtomicBoolean;
30
31 import jdk.internal.access.JavaIORandomAccessFileAccess;
32 import jdk.internal.access.SharedSecrets;
33 import sun.nio.ch.FileChannelImpl;
34
35
36 /**
37 * Instances of this class support both reading and writing to a
38 * random access file. A random access file behaves like a large
39 * array of bytes stored in the file system. There is a kind of cursor,
40 * or index into the implied array, called the <em>file pointer</em>;
41 * input operations read bytes starting at the file pointer and advance
42 * the file pointer past the bytes read. If the random access file is
43 * created in read/write mode, then output operations are also available;
44 * output operations write bytes starting at the file pointer and advance
45 * the file pointer past the bytes written. Output operations that write
46 * past the current end of the implied array cause the array to be
47 * extended. The file pointer can be read by the
48 * {@code getFilePointer} method and set by the {@code seek}
49 * method.
50 * <p>
51 * It is generally true of all the reading routines in this class that
52 * if end-of-file is reached before the desired number of bytes has been
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