1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
* 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.
*/
/*
* Content before git sha 34fdeebefcbf183ed7f916f931aa0586fdaa1b40
* Copyright (c) 2016, The Gocql authors,
* provided under the BSD-3-Clause License.
* See the NOTICE file distributed with this work for additional information.
*/
package murmur
import (
"encoding/hex"
"fmt"
"strconv"
"testing"
)
func TestRotl(t *testing.T) {
tests := []struct {
in, rotate, exp int64
}{
{123456789, 33, 1060485742448345088},
{-123456789, 33, -1060485733858410497},
{-12345678987654, 33, 1756681988166642059},
{7210216203459776512, 31, -4287945813905642825},
{2453826951392495049, 27, -2013042863942636044},
{270400184080946339, 33, -3553153987756601583},
{2060965185473694757, 31, 6290866853133484661},
{3075794793055692309, 33, -3158909918919076318},
{-6486402271863858009, 31, 405973038345868736},
}
for _, test := range tests {
t.Run(fmt.Sprintf("%d >> %d", test.in, test.rotate), func(t *testing.T) {
if v := rotl(test.in, uint8(test.rotate)); v != test.exp {
t.Fatalf("expected %d got %d", test.exp, v)
}
})
}
}
func TestFmix(t *testing.T) {
tests := []struct {
in, exp int64
}{
{123456789, -8107560010088384378},
{-123456789, -5252787026298255965},
{-12345678987654, -1122383578793231303},
{-1241537367799374202, 3388197556095096266},
{-7566534940689533355, 4729783097411765989},
}
for _, test := range tests {
t.Run(strconv.Itoa(int(test.in)), func(t *testing.T) {
if v := fmix(test.in); v != test.exp {
t.Fatalf("expected %d got %d", test.exp, v)
}
})
}
}
func TestMurmur3H1_CassandraSign(t *testing.T) {
key, err := hex.DecodeString("00104327529fb645dd00b883ec39ae448bb800000400066a6b00")
if err != nil {
t.Fatal(err)
}
h := Murmur3H1(key)
const exp int64 = -9223371632693506265
if h != exp {
t.Fatalf("expected %d got %d", exp, h)
}
}
// Test the implementation of murmur3
func TestMurmur3H1(t *testing.T) {
// these examples are based on adding a index number to a sample string in
// a loop. The expected values were generated by the java datastax murmur3
// implementation. The number of examples here of increasing lengths ensure
// test coverage of all tail-length branches in the murmur3 algorithm
seriesExpected := [...]uint64{
0x0000000000000000, // ""
0x2ac9debed546a380, // "0"
0x649e4eaa7fc1708e, // "01"
0xce68f60d7c353bdb, // "012"
0x0f95757ce7f38254, // "0123"
0x0f04e459497f3fc1, // "01234"
0x88c0a92586be0a27, // "012345"
0x13eb9fb82606f7a6, // "0123456"
0x8236039b7387354d, // "01234567"
0x4c1e87519fe738ba, // "012345678"
0x3f9652ac3effeb24, // "0123456789"
0x3f33760ded9006c6, // "01234567890"
0xaed70a6631854cb1, // "012345678901"
0x8a299a8f8e0e2da7, // "0123456789012"
0x624b675c779249a6, // "01234567890123"
0xa4b203bb1d90b9a3, // "012345678901234"
0xa3293ad698ecb99a, // "0123456789012345"
0xbc740023dbd50048, // "01234567890123456"
0x3fe5ab9837d25cdd, // "012345678901234567"
0x2d0338c1ca87d132, // "0123456789012345678"
}
sample := ""
for i, expected := range seriesExpected {
assertMurmur3H1(t, []byte(sample), expected)
sample = sample + strconv.Itoa(i%10)
}
// Here are some test examples from other driver implementations
assertMurmur3H1(t, []byte("hello"), 0xcbd8a7b341bd9b02)
assertMurmur3H1(t, []byte("hello, world"), 0x342fac623a5ebc8e)
assertMurmur3H1(t, []byte("19 Jan 2038 at 3:14:07 AM"), 0xb89e5988b737affc)
assertMurmur3H1(t, []byte("The quick brown fox jumps over the lazy dog."), 0xcd99481f9ee902c9)
}
// helper function for testing the murmur3 implementation
func assertMurmur3H1(t *testing.T, data []byte, expected uint64) {
actual := Murmur3H1(data)
if actual != int64(expected) {
t.Errorf("Expected h1 = %x for data = %x, but was %x", int64(expected), data, actual)
}
}
// Benchmark of the performance of the murmur3 implementation
func BenchmarkMurmur3H1(b *testing.B) {
data := make([]byte, 1024)
for i := 0; i < 1024; i++ {
data[i] = byte(i)
}
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
h1 := Murmur3H1(data)
if h1 != int64(7627370222079200297) {
b.Fatalf("expected %d got %d", int64(7627370222079200297), h1)
}
}
})
}
|
