83 lines
2.9 KiB
Java
83 lines
2.9 KiB
Java
/*
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* Copyright 1997 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/* @test
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@summary General tests of the setLength method -- Should migrate to 1.2 JCK
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*/
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import java.io.*;
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public class SetLength {
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static void fail(String s) {
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throw new RuntimeException(s);
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}
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static void go(File fn, int max) throws IOException {
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int chunk = max / 4;
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long i;
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RandomAccessFile f;
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f = new RandomAccessFile(fn, "rw");
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f.setLength(2 * chunk);
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if (f.length() != 2 * chunk) fail("Length not increased to " + (2 * chunk));
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if ((i = f.getFilePointer()) != 0) fail("File pointer shifted to " + i);
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byte[] buf = new byte[max];
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f.write(buf);
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if (f.length() != max) fail("Write didn't work");
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if (f.getFilePointer() != max) fail("File pointer inconsistent");
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f.setLength(3 * chunk);
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if (f.length() != 3 * chunk) fail("Length not reduced to " + 3 * chunk);
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if (f.getFilePointer() != 3 * chunk) fail("File pointer not shifted to " + (3 * chunk));
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f.seek(1 * chunk);
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if (f.getFilePointer() != 1 * chunk) fail("File pointer not shifted to " + (1 * chunk));
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f.setLength(2 * chunk);
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if (f.length() != 2 * chunk) fail("Length not reduced to " + (2 * chunk));
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if (f.getFilePointer() != 1 * chunk) fail("File pointer not shifted to " + (1 * chunk));
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f.close();
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}
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public static void main(String[] args) throws IOException {
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File fn = new File("x.SetLength");
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try {
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go(fn, 20);
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fn.delete();
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go(fn, 64 * 1024);
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RandomAccessFile f = new RandomAccessFile(fn, "r");
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boolean thrown = false;
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try {
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f.setLength(3);
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} catch (IOException x) {
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thrown = true;
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}
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if (!thrown) fail("setLength succeeded on a file opened read-only");
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f.close();
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}
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finally {
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fn.delete();
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}
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}
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}
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