| /* |
| * Copyright (C) 2012 The Guava Authors |
| * |
| * 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 com.google.common.hash; |
| |
| import static com.google.common.hash.Hashing.ChecksumType.ADLER_32; |
| import static com.google.common.hash.Hashing.ChecksumType.CRC_32; |
| |
| import com.google.common.base.Supplier; |
| |
| import junit.framework.TestCase; |
| |
| import java.util.zip.Checksum; |
| |
| /** |
| * Tests for ChecksumHashFunction. |
| * |
| * @author Colin Decker |
| */ |
| public class ChecksumHashFunctionTest extends TestCase { |
| |
| public void testCrc32_equalsChecksumValue() throws Exception { |
| assertChecksum(CRC_32, ""); |
| assertChecksum(CRC_32, "Z"); |
| assertChecksum(CRC_32, "foobar"); |
| } |
| |
| public void testAdler32_equalsChecksumValue() throws Exception { |
| assertChecksum(ADLER_32, ""); |
| assertChecksum(ADLER_32, "Z"); |
| assertChecksum(ADLER_32, "foobar"); |
| } |
| |
| public void testCrc32_knownValues() throws Exception { |
| assertHash32(0x1C8600E3, CRC_32, "hell"); |
| assertHash32(0x3610A686, CRC_32, "hello"); |
| assertHash32(0xED81F9F6, CRC_32, "hello "); |
| assertHash32(0x4850DDC2, CRC_32, "hello w"); |
| assertHash32(0x7A2D6005, CRC_32, "hello wo"); |
| assertHash32(0x1C192672, CRC_32, "hello wor"); |
| assertHash32(0x414FA339, CRC_32, "The quick brown fox jumps over the lazy dog"); |
| assertHash32(0x4400B5BC, CRC_32, "The quick brown fox jumps over the lazy cog"); |
| } |
| |
| public void testAdler32_knownValues() throws Exception { |
| assertHash32(0x041701A6, ADLER_32, "hell"); |
| assertHash32(0x062C0215, ADLER_32, "hello"); |
| assertHash32(0x08610235, ADLER_32, "hello "); |
| assertHash32(0x0B0D02AC, ADLER_32, "hello w"); |
| assertHash32(0x0E28031B, ADLER_32, "hello wo"); |
| assertHash32(0x11B5038D, ADLER_32, "hello wor"); |
| assertHash32(0x5BDC0FDA, ADLER_32, "The quick brown fox jumps over the lazy dog"); |
| assertHash32(0x5BD90FD9, ADLER_32, "The quick brown fox jumps over the lazy cog"); |
| } |
| |
| private static void assertChecksum(Supplier<Checksum> supplier, String input) { |
| byte[] bytes = HashTestUtils.ascii(input); |
| |
| Checksum checksum = supplier.get(); |
| checksum.update(bytes, 0, bytes.length); |
| long value = checksum.getValue(); |
| |
| String toString = "name"; |
| HashFunction func = new ChecksumHashFunction(supplier, 32, toString); |
| assertEquals(toString, func.toString()); |
| assertEquals(value, func.hashBytes(bytes).padToLong()); |
| } |
| |
| private static void assertHash32(int expected, Supplier<Checksum> supplier, String input) { |
| byte[] bytes = HashTestUtils.ascii(input); |
| String toString = "name"; |
| HashFunction func = new ChecksumHashFunction(supplier, 32, toString); |
| assertEquals(expected, func.hashBytes(bytes).asInt()); |
| assertEquals(toString, func.toString()); |
| } |
| } |