/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Nov 5, 2006
*/
package com.bigdata.io;
import java.nio.ByteBuffer;
import java.util.Random;
import java.util.zip.Adler32;
import com.bigdata.io.ChecksumUtility;
import junit.framework.TestCase;
/**
* Test suite for {@link ChecksumUtility}.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class TestChecksumUtility extends TestCase {
private Random r;
private ChecksumUtility chk;
/**
*
*/
public TestChecksumUtility() {
}
/**
* @param arg0
*/
public TestChecksumUtility(String arg0) {
super(arg0);
}
protected void setUp() throws Exception {
super.setUp();
r = new Random();
chk = new ChecksumUtility();
}
protected void tearDown() throws Exception {
r = null;
chk = null;
super.tearDown();
}
/**
* Test verifies that the checksum of the buffer is being computed
* correctly.
*/
public void test_checksum01() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 0,
data.length));
}
/**
* Test verifies that only the specified region of the buffer is used to
* compute the checksum.
*/
public void test_checksum02() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data, 10, 90);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 10,
data.length));
}
/**
* Test verifies that the mark, position and limit are unchanged by the
* checksum operation.
*/
public void test_checksum03() {
byte[] data = new byte[100];
r.nextBytes(data);
ByteBuffer buf = ByteBuffer.wrap(data);
// set the limit.
buf.limit(20);
/*
* set the mark (we have to choose a mark less than the position we will
* set and test below or the mark will be discarded when we set the
* position).
*/
buf.position(9);
buf.mark();
// set the position.
buf.position(12);
chk.checksum(buf, 0, data.length);
// verify limit unchanged.
assertEquals(20,buf.limit());
// verify position unchanged.
assertEquals(12,buf.position());
// reset the buffer to the mark and verify the mark was not changed.
buf.reset();
assertEquals(9,buf.position());
}
/**
* Verify that the computed checksum is the same whether the buffer is
* backed by an array or not.
*/
public void test_checksum04() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 0,
data.length));
ByteBuffer direct = ByteBuffer.allocate(data.length);
direct.put(data);
assertEquals(expectedChecksum, chk.checksum(direct, 0,
data.length));
}
public void test_checksum04_direct() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 0,
data.length));
ByteBuffer direct = ByteBuffer.allocateDirect(data.length);
direct.put(data);
assertEquals(expectedChecksum, chk.checksum(direct, 0,
data.length));
}
/**
* Verify that the computed checksum is the same whether the buffer is
* backed by an array or not when the checksum is computed for only a region
* of the buffer (java heap buffer version).
*/
public void test_checksum05() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data, 20, 100 - 10 - 20);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 20,
data.length - 10));
ByteBuffer direct = ByteBuffer.allocate(data.length);
direct.put(data);
assertEquals(expectedChecksum, chk.checksum(direct, 20,
data.length - 10));
}
/**
* Verify that the computed checksum is the same whether the buffer is
* backed by an array or not when the checksum is computed for only a region
* of the buffer (native heap buffer version).
*/
public void test_checksum05_direct() {
byte[] data = new byte[100];
r.nextBytes(data);
Adler32 adler32 = new Adler32();
adler32.update(data,20,100-10-20);
final int expectedChecksum = (int) adler32.getValue();
assertEquals(expectedChecksum, chk.checksum(ByteBuffer.wrap(data), 20,
data.length-10));
ByteBuffer direct = ByteBuffer.allocateDirect(data.length);
direct.put(data);
assertEquals(expectedChecksum, chk.checksum(direct, 20,
data.length-10));
}
}