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/*
* Copyright (c) 1997, 2018, 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 8204310
* @summary General tests of the setLength method
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @run main SetLength
* @key randomness
*/
import java.io.IOException;
import java.io.File;
import java.io.RandomAccessFile;
import jdk.test.lib.RandomFactory;
public class SetLength {
static void checkState(RandomAccessFile f, long expectedFilePointer,
long expectedLength)
throws IOException
{
long filePointer = f.getFilePointer();
long length = f.length();
if (length != expectedLength) {
throw new RuntimeException("File length " + length + " != expected "
+ expectedLength);
}
if (filePointer != expectedFilePointer) {
throw new RuntimeException("File pointer " + filePointer
+ " != expected " + expectedFilePointer);
}
}
static void test(RandomAccessFile f, long quarterLength)
throws IOException
{
long halfLength = 2 * quarterLength;
long threeQuarterLength = 3 * quarterLength;
long fullLength = 4 * quarterLength;
// initially, empty file
checkState(f, 0, 0);
// extending the file size
f.setLength(halfLength);
checkState(f, 0, halfLength);
// writing from the begining
f.write(new byte[(int)fullLength]);
checkState(f, fullLength, fullLength);
// setting to the same length
f.setLength(fullLength);
checkState(f, fullLength, fullLength);
// truncating the file
f.setLength(threeQuarterLength);
checkState(f, threeQuarterLength, threeQuarterLength);
// changing the file pointer
f.seek(quarterLength);
checkState(f, quarterLength, threeQuarterLength);
// truncating the file again
f.setLength(halfLength);
checkState(f, quarterLength, halfLength);
// writing from the middle with extending the file
f.write(new byte[(int)halfLength]);
checkState(f, threeQuarterLength, threeQuarterLength);
// changing the file pointer
f.seek(quarterLength);
checkState(f, quarterLength, threeQuarterLength);
// writing from the middle without extending the file
f.write(new byte[(int)quarterLength]);
checkState(f, halfLength, threeQuarterLength);
// changing the file pointer to the end of file
f.seek(threeQuarterLength);
checkState(f, threeQuarterLength, threeQuarterLength);
// writing to the end of file
f.write(new byte[(int)quarterLength]);
checkState(f, fullLength, fullLength);
// truncating the file to zero
f.setLength(0);
checkState(f, 0, 0);
// changing the file pointer beyond the end of file
f.seek(threeQuarterLength);
checkState(f, threeQuarterLength, 0);
// writing beyont the end of file
f.write(new byte[(int)quarterLength]);
checkState(f, fullLength, fullLength);
// negative file pointer
try {
f.seek(-1);
throw new RuntimeException("IOE not thrown");
} catch (IOException expected) {
}
checkState(f, fullLength, fullLength);
// truncating the file after failed seek
f.setLength(halfLength);
checkState(f, halfLength, halfLength);
// truncating after closing
f.close();
try {
f.setLength(halfLength);
throw new RuntimeException("IOE not thrown");
} catch (IOException expected) {
}
}
public static void main(String[] args) throws IOException {
File f28b = new File("f28b");
File f28K = new File("f28K");
File frnd = new File("frnd");
try (RandomAccessFile raf28b = new RandomAccessFile(f28b, "rw");
RandomAccessFile raf28K = new RandomAccessFile(f28K, "rw");
RandomAccessFile rafrnd = new RandomAccessFile(frnd, "rw")) {
test(raf28b, 7);
test(raf28K, 7 * 1024);
test(rafrnd, 1 + RandomFactory.getRandom().nextInt(16000));
}
// truncating read-only file
try (RandomAccessFile raf28b = new RandomAccessFile(f28b, "r")) {
raf28b.setLength(42);
throw new RuntimeException("IOE not thrown");
} catch (IOException expected) {
}
}
}
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