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
|
// Copyright 2014-2022 Ulrich Kunitz. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package hash
import (
"math/rand"
"testing"
)
func TestRabinKarpSimple(t *testing.T) {
p := []byte("abcde")
r := NewRabinKarp(4)
h2 := Hashes(r, p)
for i, h := range h2 {
w := Hashes(r, p[i:i+4])[0]
t.Logf("%d h=%#016x w=%#016x", i, h, w)
if h != w {
t.Errorf("rolling hash %d: %#016x; want %#016x",
i, h, w)
}
}
}
func makeBenchmarkBytes(n int) []byte {
rnd := rand.New(rand.NewSource(42))
p := make([]byte, n)
for i := range p {
p[i] = byte(rnd.Uint32())
}
return p
}
func BenchmarkRabinKarp(b *testing.B) {
p := makeBenchmarkBytes(4096)
r := NewRabinKarp(4)
b.ResetTimer()
for i := 0; i < b.N; i++ {
Hashes(r, p)
}
}
|
