1 // Copyright 2023 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
15 var xxHashTests = []struct {
24 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$",
29 func TestXXHash(t *testing.T) {
31 for i, test := range xxHashTests {
33 xh.update([]byte(test.data))
34 if got := xh.digest(); got != test.hash {
35 t.Errorf("#%d: got %#x want %#x", i, got, test.hash)
40 func TestLargeXXHash(t *testing.T) {
42 t.Skip("skipping expensive test in short mode")
50 // Write varying amounts to test buffering.
55 xh.update(data[i : i+c])
60 want := uint64(0xf0dd39fd7e063f82)
62 t.Errorf("got %#x want %#x", got, want)
66 func FuzzXXHash(f *testing.F) {
67 if _, err := os.Stat("/usr/bin/xxhsum"); err != nil {
68 f.Skip("skipping because /usr/bin/xxhsum does not exist")
71 for _, test := range xxHashTests {
72 f.Add([]byte(test.data))
74 f.Add(bytes.Repeat([]byte("abcdefghijklmnop"), 256))
76 for i := 0; i < 256; i++ {
77 buf.WriteByte(byte(i))
79 f.Add(bytes.Repeat(buf.Bytes(), 64))
82 f.Fuzz(func(t *testing.T, b []byte) {
83 cmd := exec.Command("/usr/bin/xxhsum", "-H64")
84 cmd.Stdin = bytes.NewReader(b)
85 var hhsumHash bytes.Buffer
86 cmd.Stdout = &hhsumHash
87 if err := cmd.Run(); err != nil {
88 t.Fatalf("running hhsum failed: %v", err)
90 hhHashBytes := bytes.Fields(bytes.TrimSpace(hhsumHash.Bytes()))[0]
91 hhHash, err := strconv.ParseUint(string(hhHashBytes), 16, 64)
93 t.Fatalf("could not parse hash %q: %v", hhHashBytes, err)
101 if goHash != hhHash {
102 t.Errorf("Go hash %#x != xxhsum hash %#x", goHash, hhHash)