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/*
* DSI utilities
*
* Copyright (C) 2010-2023 Sebastiano Vigna
*
* This program and the accompanying materials are made available under the
* terms of the GNU Lesser General Public License v2.1 or later,
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html,
* or the Apache Software License 2.0, which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* This program 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.
*
* SPDX-License-Identifier: LGPL-2.1-or-later OR Apache-2.0
*/
package it.unimi.dsi.io;
import static org.junit.Assert.assertEquals;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
import java.util.Random;
import org.junit.Test;
import it.unimi.dsi.util.SplitMix64Random;
/**
* Note: this test has little meaning unless you change ByteBufferInputStream.CHUNK_SHIFT to 16.
*/
@SuppressWarnings("resource")
public class ByteBufferInputStreamTest {
private static final boolean DEBUG = false;
@Test
public void testStream() throws FileNotFoundException, IOException {
final File f = File.createTempFile(ByteBufferInputStreamTest.class.getName(), "tmp");
f.deleteOnExit();
final int l = 100000;
final long seed = System.currentTimeMillis();
if (DEBUG) System.err.println("Seed: " + seed);
final Random random = new SplitMix64Random(seed);
for(int n = 1; n < 8; n++) {
final FileOutputStream fos = new FileOutputStream(f);
for(int i = 0; i < l * n; i++) fos.write(random.nextInt() & 0xFF);
fos.close();
final FileChannel channel = new FileInputStream(f).getChannel();
ByteBufferInputStream bis = ByteBufferInputStream.map(channel, MapMode.READ_ONLY);
if (n % 2 == 0) bis = bis.copy();
FileInputStream test = new FileInputStream(f);
FileChannel fc = test.getChannel();
int a1, a2, off, len, pos;
final byte b1[] = new byte[32768];
final byte b2[] = new byte[32768];
for(int k = 0; k < l / 10; k++) {
switch (random.nextInt(6)) {
case 0:
if (DEBUG) System.err.println("read()");
a1 = bis.read();
a2 = test.read();
assertEquals(a2, a1);
break;
case 1:
off = random.nextInt(b1.length);
len = random.nextInt(b1.length - off + 1);
a1 = bis.read(b1, off, len);
a2 = test.read(b2, off, len);
if (DEBUG) System.err.println("read(b, " + off + ", " + len + ")");
assertEquals(a2, a1);
for (int i = off; i < off + len; i++)
assertEquals(b2[i], b1[i]);
break;
case 2:
if (DEBUG) System.err.println("available()");
assertEquals(test.available(), bis.available());
break;
case 3:
pos = (int)bis.position();
if (DEBUG) System.err.println("position()=" + pos);
assertEquals((int)fc.position(), pos);
break;
case 4:
pos = random.nextInt(l * n);
bis.position(pos);
if (DEBUG) System.err.println("position(" + pos + ")");
(test = new FileInputStream(f)).skip(pos);
fc = test.getChannel();
break;
case 5:
pos = random.nextInt((int)(l * n - bis.position() + 1));
if (DEBUG) System.err.println("skip(" + pos + ")");
a1 = (int)bis.skip(pos);
a2 = (int)test.skip(pos);
assertEquals(a2, a1);
break;
}
}
test.close();
bis = null;
System.gc(); // Try to get rid of mapped buffers.
channel.close();
}
}
@Test
public void testEmpty() throws IOException {
final File f = File.createTempFile(ByteBufferInputStreamTest.class.getName(), "tmp");
f.deleteOnExit();
final FileChannel channel = new FileInputStream(f).getChannel();
final ByteBufferInputStream s = ByteBufferInputStream.map(channel);
final byte b[] = new byte[1];
assertEquals(-1, s.read());
assertEquals(-1, s.read(b));
assertEquals(0, s.available());
assertEquals(0, s.skip(1));
assertEquals(0, s.length());
assertEquals(0, s.position());
s.position(1);
assertEquals(-1, s.read());
assertEquals(-1, s.read(b));
assertEquals(0, s.available());
assertEquals(0, s.skip(1));
assertEquals(0, s.length());
assertEquals(0, s.position());
s.position(1);
final ByteBufferInputStream t = s.copy();
assertEquals(-1, t.read());
assertEquals(-1, t.read(b));
assertEquals(0, t.available());
assertEquals(0, t.skip(1));
assertEquals(0, t.length());
assertEquals(0, t.position());
t.position(1);
assertEquals(-1, t.read());
assertEquals(-1, t.read(b));
assertEquals(0, t.available());
assertEquals(0, t.skip(1));
assertEquals(0, t.length());
assertEquals(0, t.position());
}
}
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