1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.hash; 18 19 import static com.google.common.hash.HashTestUtils.ascii; 20 import static com.google.common.hash.HashTestUtils.toBytes; 21 import static com.google.common.hash.Hashing.murmur3_128; 22 import static java.nio.ByteOrder.LITTLE_ENDIAN; 23 24 import com.google.common.hash.Funnels; 25 import com.google.common.hash.HashTestUtils.HashFn; 26 27 import junit.framework.TestCase; 28 29 import java.util.Arrays; 30 31 /** 32 * Tests for Murmur3Hash128. 33 */ 34 public class Murmur3Hash128Test extends TestCase { 35 public void testCompatibilityWithCPlusPlus() { 36 assertHash(0, toBytes(LITTLE_ENDIAN, 0x629942693e10f867L, 0x92db0b82baeb5347L), 37 ascii("hell")); 38 assertHash(1, toBytes(LITTLE_ENDIAN, 0xa78ddff5adae8d10L, 0x128900ef20900135L), 39 ascii("hello")); 40 assertHash(2, toBytes(LITTLE_ENDIAN, 0x8a486b23f422e826L, 0xf962a2c58947765fL), 41 ascii("hello ")); 42 assertHash(3, toBytes(LITTLE_ENDIAN, 0x2ea59f466f6bed8cL, 0xc610990acc428a17L), 43 ascii("hello w")); 44 assertHash(4, toBytes(LITTLE_ENDIAN, 0x79f6305a386c572cL, 0x46305aed3483b94eL), 45 ascii("hello wo")); 46 assertHash(5, toBytes(LITTLE_ENDIAN, 0xc2219d213ec1f1b5L, 0xa1d8e2e0a52785bdL), 47 ascii("hello wor")); 48 assertHash(0, toBytes(LITTLE_ENDIAN, 0xe34bbc7bbc071b6cL, 0x7a433ca9c49a9347L), 49 ascii("The quick brown fox jumps over the lazy dog")); 50 assertHash(0, toBytes(LITTLE_ENDIAN, 0x658ca970ff85269aL, 0x43fee3eaa68e5c3eL), 51 ascii("The quick brown fox jumps over the lazy cog")); 52 } 53 54 private static void assertHash(int seed, byte[] expectedHash, byte[] input) { 55 byte[] hash = murmur3_128(seed).newHasher().putBytes(input).hash().asBytes(); 56 assertTrue(Arrays.equals(expectedHash, hash)); 57 } 58 59 public void testParanoid() { 60 HashFn hf = new HashFn() { 61 @Override public byte[] hash(byte[] input, int seed) { 62 Hasher hasher = murmur3_128(seed).newHasher(); 63 Funnels.byteArrayFunnel().funnel(input, hasher); 64 return hasher.hash().asBytes(); 65 } 66 }; 67 // the magic number comes from: 68 // http://code.google.com/p/smhasher/source/browse/trunk/main.cpp, #74 69 HashTestUtils.verifyHashFunction(hf, 128, 0x6384BA69); 70 } 71 } 72
