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match_test.go
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/
match_test.go
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package match
import (
"fmt"
"reflect"
"testing"
fuzz "github.com/google/gofuzz"
)
func ExampleMatch4() {
var haystack = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
}
found := Match4(haystack[8:12], haystack, nil)
fmt.Printf("%#v", found)
//Output: []int{8, 24, 40, 56}
}
func TestMatch4End(t *testing.T) {
var haystack = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
}
found := Match4(haystack[60:64], haystack, nil)
expect := "[]int{12, 28, 44, 60}"
got := fmt.Sprintf("%#v", found)
if expect != got {
t.Fatal("Expected", expect, "but got", got)
}
}
func ExampleMatch8() {
var haystack = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
}
found := Match8(haystack[8:16], haystack, nil)
fmt.Printf("%#v", found)
// Output: []int{8, 24, 40, 56}
}
func ExampleMatch8And4() {
var haystack = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115,
}
// Match 12 and 8 bytes
f8, f4 := Match8And4(haystack[12:20], haystack, nil, nil)
fmt.Printf("Length 8 match: %#v\n", f8)
fmt.Printf("Length 4 match: %#v", f4)
// Output: Length 8 match: []int{12}
// Length 4 match: []int{28}
}
func ExampleMatchLen() {
var data = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115,
}
// Get match length
length := MatchLen(data[10:], data[26:], 16)
fmt.Printf("Number of matching bytes: %d, first mismatch %d/%d\n", length, data[10+length], data[26+length])
// Output: Number of matching bytes: 6, first mismatch 0/100
}
func TestMatch8And4s16(t *testing.T) {
size := 16
ta := make([]byte, size)
found8, found4 := Match8And4(ta[0:8], ta, nil, nil)
expect4 := []int{9, 10, 11, 12}
expect8 := []int{0, 1, 2, 3, 4, 5, 6, 7, 8}
if !reflect.DeepEqual(found4, expect4) {
t.Errorf("4matches: got \n%#v, expected:\n%#v", found4, expect4)
}
if !reflect.DeepEqual(found8, expect8) {
t.Errorf("8matches: got \n%#v, expected:\n%#v", found8, expect8)
}
UseSse41 = false
found8, found4 = Match8And4(ta[0:8], ta, nil, nil)
if !reflect.DeepEqual(found4, expect4) {
t.Errorf("4matches: got \n%#v, expected:\n%#v", found4, expect4)
}
if !reflect.DeepEqual(found8, expect8) {
t.Errorf("8matches: got \n%#v, expected:\n%#v", found8, expect8)
}
UseSse41 = true
}
func TestMatch8And4s32(t *testing.T) {
size := 32
ta := make([]byte, size)
found8, found4 := Match8And4(ta[0:8], ta, nil, nil)
expect4 := []int{25, 26, 27, 28}
expect8 := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24}
if !reflect.DeepEqual(found4, expect4) {
t.Errorf("4matches: got \n%#v, expected:\n%#v", found4, expect4)
}
if !reflect.DeepEqual(found8, expect8) {
t.Errorf("8matches: got \n%#v, expected:\n%#v", found8, expect8)
}
UseSse41 = false
found8, found4 = Match8And4(ta[0:8], ta, nil, nil)
if !reflect.DeepEqual(found4, expect4) {
t.Errorf("4matches: got \n%#v, expected:\n%#v", found4, expect4)
}
if !reflect.DeepEqual(found8, expect8) {
t.Errorf("8matches: got \n%#v, expected:\n%#v", found8, expect8)
}
UseSse41 = true
}
func TestMatchLen(t *testing.T) {
var data []byte
for size := 0; size < 1000; size++ {
f := fuzz.New()
f.NumElements(size, size*2)
f.NilChance(0.0)
f.Fuzz(&data)
length := MatchLen(data, data, size)
if length != size {
t.Fatalf("unexpected match length, (got) %d != %d (expected)", length, size)
}
if size == 0 {
continue
}
// Change a value, and test if it is picked up
var m int
f.Fuzz(&m)
if m < 0 {
m *= -1
}
m %= len(data)
var b = make([]byte, len(data))
copy(b, data)
b[m] = b[m] ^ 255
length = MatchLen(data, b, size)
if m < size {
if length != m {
t.Fatalf("unexpected match length, (got) %d != %d (expected)", length, m)
}
} else {
if length != size {
t.Fatalf("unexpected match length, (got) %d != %d (expected)", length, size)
}
}
}
}
func BenchmarkMatch4String(b *testing.B) {
size := 1024
found := make([]int, 0, 10)
ta := make([]byte, size)
f := fuzz.New()
f.NumElements(size, size)
f.NilChance(0.0)
f.Fuzz(&ta)
txt := string(ta)
b.SetBytes(int64(size))
b.ResetTimer()
for i := 0; i < b.N; i++ {
found = Match4String(txt[800:804], txt, found)
}
}
// Shows the overhead of converting to bytes.
func BenchmarkMatch4Convert(b *testing.B) {
size := 1024
found := make([]int, 0, 10)
ta := make([]byte, size)
f := fuzz.New()
f.NumElements(size, size)
f.NilChance(0.0)
f.Fuzz(&ta)
txt := string(ta)
b.SetBytes(int64(size))
b.ResetTimer()
for i := 0; i < b.N; i++ {
found = Match4([]byte(txt[800:804]), []byte(txt), found)
}
}
func BenchmarkMatch8(b *testing.B) {
size := 32768
ta := make([]byte, size)
found := make([]int, 0, 10)
f := fuzz.New()
f.NumElements(size, size)
f.NilChance(0.0)
f.Fuzz(&ta)
b.SetBytes(int64(size))
b.ResetTimer()
for i := 0; i < b.N; i++ {
found = Match8(ta[800:808], ta, found)
}
}
func BenchmarkMatch8And4(b *testing.B) {
size := 32768
ta := make([]byte, size)
found4 := make([]int, 0, 10)
found8 := make([]int, 0, 10)
f := fuzz.New()
f.NumElements(size, size)
f.NilChance(0.0)
f.Fuzz(&ta)
b.SetBytes(int64(size))
b.ResetTimer()
for i := 0; i < b.N; i++ {
found4, found8 = Match8And4(ta[800:808], ta, found4, found8)
}
}
func BenchmarkMatchLen256(b *testing.B) {
size := 256
ta := make([]byte, size)
f := fuzz.New()
f.NumElements(size, size)
f.NilChance(0.0)
f.Fuzz(&ta)
b.SetBytes(int64(size))
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = MatchLen(ta, ta, size)
}
}