86 lines
3.1 KiB
Java
86 lines
3.1 KiB
Java
/*
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* Copyright (C) 2012 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.google.common.hash;
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import static com.google.common.hash.Hashing.ChecksumType.ADLER_32;
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import static com.google.common.hash.Hashing.ChecksumType.CRC_32;
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import java.util.zip.Checksum;
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import junit.framework.TestCase;
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/**
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* Tests for ChecksumHashFunction.
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*
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* @author Colin Decker
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*/
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public class ChecksumHashFunctionTest extends TestCase {
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public void testCrc32_equalsChecksumValue() throws Exception {
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assertChecksum(CRC_32, "");
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assertChecksum(CRC_32, "Z");
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assertChecksum(CRC_32, "foobar");
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}
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public void testAdler32_equalsChecksumValue() throws Exception {
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assertChecksum(ADLER_32, "");
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assertChecksum(ADLER_32, "Z");
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assertChecksum(ADLER_32, "foobar");
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}
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public void testCrc32_knownValues() throws Exception {
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assertHash32(0x1C8600E3, CRC_32, "hell");
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assertHash32(0x3610A686, CRC_32, "hello");
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assertHash32(0xED81F9F6, CRC_32, "hello ");
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assertHash32(0x4850DDC2, CRC_32, "hello w");
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assertHash32(0x7A2D6005, CRC_32, "hello wo");
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assertHash32(0x1C192672, CRC_32, "hello wor");
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assertHash32(0x414FA339, CRC_32, "The quick brown fox jumps over the lazy dog");
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assertHash32(0x4400B5BC, CRC_32, "The quick brown fox jumps over the lazy cog");
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}
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public void testAdler32_knownValues() throws Exception {
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assertHash32(0x041701A6, ADLER_32, "hell");
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assertHash32(0x062C0215, ADLER_32, "hello");
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assertHash32(0x08610235, ADLER_32, "hello ");
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assertHash32(0x0B0D02AC, ADLER_32, "hello w");
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assertHash32(0x0E28031B, ADLER_32, "hello wo");
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assertHash32(0x11B5038D, ADLER_32, "hello wor");
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assertHash32(0x5BDC0FDA, ADLER_32, "The quick brown fox jumps over the lazy dog");
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assertHash32(0x5BD90FD9, ADLER_32, "The quick brown fox jumps over the lazy cog");
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}
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private static void assertChecksum(ImmutableSupplier<Checksum> supplier, String input) {
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byte[] bytes = HashTestUtils.ascii(input);
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Checksum checksum = supplier.get();
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checksum.update(bytes, 0, bytes.length);
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long value = checksum.getValue();
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String toString = "name";
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HashFunction func = new ChecksumHashFunction(supplier, 32, toString);
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assertEquals(toString, func.toString());
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assertEquals(value, func.hashBytes(bytes).padToLong());
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}
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private static void assertHash32(
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int expected, ImmutableSupplier<Checksum> supplier, String input) {
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byte[] bytes = HashTestUtils.ascii(input);
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String toString = "name";
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HashFunction func = new ChecksumHashFunction(supplier, 32, toString);
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assertEquals(expected, func.hashBytes(bytes).asInt());
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assertEquals(toString, func.toString());
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}
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}
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