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/*
* Copyright (c) 2000, 2010, 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 4862382 4862408
* @summary Test positional read method of FileChannel
* @key randomness
*/
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.*;
import java.nio.channels.FileChannel;
import java.util.Random;
/**
* Testing FileChannel's positional read method.
*/
public class Pread {
private static PrintStream err = System.err;
private static Random generator = new Random();
private static int CHARS_PER_LINE = File.separatorChar == '/' ? 5 : 6;
public static void main(String[] args) throws Exception {
genericTest();
testNegativePosition(); // This test for bug 4862382
testUnreadableChannel();// This test for bug 4862408
}
// This test for bug 4862382
private static void testNegativePosition() throws Exception {
File blah = File.createTempFile("blah1", null);
blah.deleteOnExit();
FileOutputStream fos = new FileOutputStream(blah);
fos.write(new byte[128]);
fos.close();
FileChannel fc = (new FileInputStream(blah)).getChannel();
try {
fc.read(ByteBuffer.allocate(256), -1L);
throw new RuntimeException("Expected exception not thrown");
} catch(IllegalArgumentException e) {
// Correct result
} finally {
fc.close();
blah.delete();
}
}
// This test for bug 4862408
private static void testUnreadableChannel() throws Exception {
File blah = File.createTempFile("blah2", null);
blah.deleteOnExit();
FileOutputStream fos = new FileOutputStream(blah);
try {
fos.write(new byte[128]);
FileChannel fc = fos.getChannel();
try {
fc.read(ByteBuffer.allocate(256),1);
throw new RuntimeException("Expected exception not thrown");
} catch(NonReadableChannelException e) {
// Correct result
}
} finally {
fos.close();
blah.delete();
}
}
private static void genericTest() throws Exception {
StringBuffer sb = new StringBuffer();
sb.setLength(4);
File blah = File.createTempFile("blah3", null);
blah.deleteOnExit();
initTestFile(blah);
FileInputStream fis = new FileInputStream(blah);
FileChannel c = fis.getChannel();
for (int x=0; x<100; x++) {
long offset = generator.nextInt(1000);
long expectedResult = offset / CHARS_PER_LINE;
offset = expectedResult * CHARS_PER_LINE;
ByteBuffer bleck = ByteBuffer.allocateDirect(4);
long originalPosition = c.position();
int totalRead = 0;
while (totalRead < 4) {
int read = c.read(bleck, offset);
if (read < 0)
throw new Exception("Read failed");
totalRead += read;
}
long newPosition = c.position();
for (int i=0; i<4; i++) {
byte aByte = bleck.get(i);
sb.setCharAt(i, (char)aByte);
}
int result = Integer.parseInt(sb.toString());
if (result != expectedResult) {
err.println("I expected "+ expectedResult);
err.println("I got "+ result);
throw new Exception("Read test failed");
}
// Ensure that file pointer position has not changed
if (originalPosition != newPosition)
throw new Exception("File position modified");
}
c.close();
fis.close();
blah.delete();
}
/**
* Creates file blah:
* 0000
* 0001
* 0002
* 0003
* .
* .
* .
* 3999
*
* Blah extends beyond a single page of memory so that the
* ability to index into a file of multiple pages is tested.
*/
private static void initTestFile(File blah) throws Exception {
FileOutputStream fos = new FileOutputStream(blah);
BufferedWriter awriter
= new BufferedWriter(new OutputStreamWriter(fos, "8859_1"));
for(int i=0; i<4000; i++) {
String number = new Integer(i).toString();
for (int h=0; h<4-number.length(); h++)
awriter.write("0");
awriter.write(""+i);
awriter.newLine();
}
awriter.flush();
awriter.close();
}
}
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