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/*
* Copyright (c) 2021, 2024, 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
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @run main ReadXBytes
* @bug 8264777
* @summary Test read{All,N}Bytes overrides (use -Dseed=X to set PRNG seed)
* @key randomness
*/
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Arrays;
import java.util.Random;
import jdk.test.lib.RandomFactory;
public class ReadXBytes {
private static final int ITERATIONS = 10;
private static final int MAX_FILE_SIZE = 1_000_000;
private static final Random RND = RandomFactory.getRandom();
public static void main(String args[]) throws IOException {
File dir = new File(".");
dir.deleteOnExit();
File empty = File.createTempFile("foo", "bar", dir);
empty.deleteOnExit();
try (FileInputStream fis = new FileInputStream(empty)) {
try {
fis.readNBytes(-1);
throw new RuntimeException("IllegalArgumentException expected");
} catch (IllegalArgumentException expected) {
}
byte[] nbytes = fis.readNBytes(0);
if (nbytes.length != 0)
throw new RuntimeException("readNBytes() zero length for empty");
byte[] b = fis.readNBytes(1);
if (b.length != 0)
throw new RuntimeException("readNBytes: zero-length byte[] expected");
b = fis.readAllBytes();
if (b.length != 0)
throw new RuntimeException("readAllBytes: zero-length byte[] expected");
}
for (int i = 0; i < ITERATIONS; i++) {
File file = File.createTempFile("foo", "bar", dir);
file.deleteOnExit();
int size = 1 + RND.nextInt(MAX_FILE_SIZE);
System.out.printf("size %d%n", size);
byte[] bytes = new byte[size];
RND.nextBytes(bytes);
try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
raf.write(bytes);
}
try (FileInputStream fis = new FileInputStream(file)) {
int pos = RND.nextInt(size);
int len = RND.nextInt(size - pos);
fis.getChannel().position(pos);
byte[] nbytes = fis.readNBytes(0);
if (nbytes.length != 0)
throw new RuntimeException("readNBytes() zero length");
nbytes = fis.readNBytes(len);
if (nbytes.length != len)
throw new RuntimeException("readNBytes() length");
if (!Arrays.equals(nbytes, 0, len, bytes, pos, pos + len))
throw new RuntimeException("readNBytes() content");
}
try (FileInputStream fis = new FileInputStream(file)) {
int pos = RND.nextInt(size);
fis.getChannel().position(pos);
byte[] allbytes = fis.readAllBytes();
if (allbytes.length != size - pos)
throw new RuntimeException("readAllBytes() length");
if (!Arrays.equals(allbytes, 0, allbytes.length,
bytes, pos, pos + allbytes.length))
throw new RuntimeException("readAllBytes() content");
}
file.delete();
}
dir.delete();
}
}
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