| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.commons.codec.digest; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * Test class for PureJavaCrc32C. |
| * Test data was derived from |
| * https://tools.ietf.org/html/rfc3720#appendix-B.4 |
| */ |
| public class PureJavaCrc32CTest { |
| |
| private final PureJavaCrc32C crc = new PureJavaCrc32C(); |
| |
| private final byte[] data = new byte[32]; |
| |
| @Test |
| public void testZeros() { |
| for(int i = 0; i < data.length; i ++) { |
| data[i]= (byte) 0; |
| } |
| check(0x8a9136aa); // aa 36 91 8a |
| } |
| |
| @Test |
| public void testOnes() { |
| for(int i = 0; i < data.length; i ++) { |
| data[i]= (byte) 0xFF; |
| } |
| check(0x62a8ab43); // 43 ab a8 62 |
| } |
| |
| @Test |
| public void testIncreasing() { |
| for(int i = 0; i < data.length; i ++) { |
| data[i]= (byte) i; |
| } |
| check(0x46dd794e); // 4e 79 dd 46 |
| } |
| |
| @Test |
| public void testDecreasing() { |
| for(int i = 0; i < data.length; i ++) { |
| data[i]= (byte) (31-i); |
| } |
| check(0x113fdb5c); // 5c db 3f 11 |
| } |
| |
| // Using int because only want 32 bits |
| private void check(final int expected) { |
| crc.reset(); |
| crc.update(data, 0, data.length); |
| final int actual = (int) crc.getValue(); |
| Assert.assertEquals(Integer.toHexString(expected), Integer.toHexString(actual)); |
| } |
| |
| } |