/**
* Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
* University
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. You may obtain
* a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
**/
package org.openflow.util;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import junit.framework.TestCase;
public class UnsignedTest extends TestCase {
public static String ULONG_MAX = "18446744073709551615";
/**
* Tests that we correctly extract an unsigned long into a BigInteger
* @throws Exception
*/
public void testGetUnsignedLong() throws Exception {
ByteBuffer bb = ByteBuffer.allocate(8);
bb.put((byte)0xff).put((byte)0xff).put((byte)0xff).put((byte)0xff);
bb.put((byte)0xff).put((byte)0xff).put((byte)0xff).put((byte)0xff);
bb.position(0);
bb.limit(8);
BigInteger bi = Unsigned.getUnsignedLong(bb);
BigInteger uLongMax = new BigInteger(ULONG_MAX);
for (int i = 0; i < uLongMax.bitCount(); ++i) {
TestCase.assertTrue("Bit: " + i + " should be: " + uLongMax.testBit(i),
uLongMax.testBit(i) == bi.testBit(i));
}
TestCase.assertEquals(ULONG_MAX, bi.toString());
bb = ByteBuffer.allocate(10);
bb.put((byte)0x00);
bb.put((byte)0xff).put((byte)0xff).put((byte)0xff).put((byte)0xff);
bb.put((byte)0xff).put((byte)0xff).put((byte)0xff).put((byte)0xff);
bb.put((byte)0x00);
bb.position(0);
bb.limit(10);
bi = Unsigned.getUnsignedLong(bb, 1);
uLongMax = new BigInteger(ULONG_MAX);
for (int i = 0; i < uLongMax.bitCount(); ++i) {
TestCase.assertTrue("Bit: " + i + " should be: " + uLongMax.testBit(i),
uLongMax.testBit(i) == bi.testBit(i));
}
TestCase.assertEquals(ULONG_MAX, bi.toString());
}
/**
* Tests that we correctly put an unsigned long into a ByteBuffer
* @throws Exception
*/
public void testPutUnsignedLong() throws Exception {
ByteBuffer bb = ByteBuffer.allocate(8);
BigInteger uLongMax = new BigInteger(ULONG_MAX);
Unsigned.putUnsignedLong(bb, uLongMax);
for (int i = 0; i < 8; ++i) {
TestCase.assertTrue("Byte: " + i + " should be 0xff, was: " + bb.get(i),
(bb.get(i) & (short)0xff) == 0xff);
}
bb = ByteBuffer.allocate(10);
Unsigned.putUnsignedLong(bb, uLongMax, 1);
int offset = 1;
for (int i = 0; i < 8; ++i) {
TestCase.assertTrue("Byte: " + i + " should be 0xff, was: " +
bb.get(offset+i), (bb.get(offset+i) & (short)0xff) == 0xff);
}
}
}