Source file
src/hash/fnv/fnv_test.go
1
2
3
4
5 package fnv
6
7 import (
8 "bytes"
9 "encoding"
10 "encoding/binary"
11 "hash"
12 "internal/testhash"
13 "io"
14 "testing"
15 )
16
17 func TestHashInterface(t *testing.T) {
18 type test struct {
19 name string
20 fn func() hash.Hash
21 }
22 fn32 := func(fn func() hash.Hash32) func() hash.Hash {
23 return func() hash.Hash { return fn() }
24 }
25 fn64 := func(fn func() hash.Hash64) func() hash.Hash {
26 return func() hash.Hash { return fn() }
27 }
28 tests := []test{
29 {"32", fn32(New32)},
30 {"32a", fn32(New32a)},
31 {"64", fn64(New64)},
32 {"64a", fn64(New64a)},
33 {"128", New128},
34 {"128a", New128a},
35 }
36 for _, test := range tests {
37 t.Run(test.name, func(t *testing.T) {
38 testhash.TestHash(t, test.fn)
39 })
40 }
41 }
42
43 type golden struct {
44 out []byte
45 in string
46 halfState string
47 }
48
49 var golden32 = []golden{
50 {[]byte{0x81, 0x1c, 0x9d, 0xc5}, "", "fnv\x01\x81\x1c\x9d\xc5"},
51 {[]byte{0x05, 0x0c, 0x5d, 0x7e}, "a", "fnv\x01\x81\x1c\x9d\xc5"},
52 {[]byte{0x70, 0x77, 0x2d, 0x38}, "ab", "fnv\x01\x05\f]~"},
53 {[]byte{0x43, 0x9c, 0x2f, 0x4b}, "abc", "fnv\x01\x05\f]~"},
54 }
55
56 var golden32a = []golden{
57 {[]byte{0x81, 0x1c, 0x9d, 0xc5}, "", "fnv\x02\x81\x1c\x9d\xc5"},
58 {[]byte{0xe4, 0x0c, 0x29, 0x2c}, "a", "fnv\x02\x81\x1c\x9d\xc5"},
59 {[]byte{0x4d, 0x25, 0x05, 0xca}, "ab", "fnv\x02\xe4\f),"},
60 {[]byte{0x1a, 0x47, 0xe9, 0x0b}, "abc", "fnv\x02\xe4\f),"},
61 }
62
63 var golden64 = []golden{
64 {[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, "", "fnv\x03\xcb\xf2\x9c\xe4\x84\"#%"},
65 {[]byte{0xaf, 0x63, 0xbd, 0x4c, 0x86, 0x01, 0xb7, 0xbe}, "a", "fnv\x03\xcb\xf2\x9c\xe4\x84\"#%"},
66 {[]byte{0x08, 0x32, 0x67, 0x07, 0xb4, 0xeb, 0x37, 0xb8}, "ab", "fnv\x03\xafc\xbdL\x86\x01\xb7\xbe"},
67 {[]byte{0xd8, 0xdc, 0xca, 0x18, 0x6b, 0xaf, 0xad, 0xcb}, "abc", "fnv\x03\xafc\xbdL\x86\x01\xb7\xbe"},
68 }
69
70 var golden64a = []golden{
71 {[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, "", "fnv\x04\xcb\xf2\x9c\xe4\x84\"#%"},
72 {[]byte{0xaf, 0x63, 0xdc, 0x4c, 0x86, 0x01, 0xec, 0x8c}, "a", "fnv\x04\xcb\xf2\x9c\xe4\x84\"#%"},
73 {[]byte{0x08, 0x9c, 0x44, 0x07, 0xb5, 0x45, 0x98, 0x6a}, "ab", "fnv\x04\xafc\xdcL\x86\x01\xec\x8c"},
74 {[]byte{0xe7, 0x1f, 0xa2, 0x19, 0x05, 0x41, 0x57, 0x4b}, "abc", "fnv\x04\xafc\xdcL\x86\x01\xec\x8c"},
75 }
76
77 var golden128 = []golden{
78 {[]byte{0x6c, 0x62, 0x27, 0x2e, 0x07, 0xbb, 0x01, 0x42, 0x62, 0xb8, 0x21, 0x75, 0x62, 0x95, 0xc5, 0x8d}, "", "fnv\x05lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
79 {[]byte{0xd2, 0x28, 0xcb, 0x69, 0x10, 0x1a, 0x8c, 0xaf, 0x78, 0x91, 0x2b, 0x70, 0x4e, 0x4a, 0x14, 0x1e}, "a", "fnv\x05lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
80 {[]byte{0x8, 0x80, 0x94, 0x5a, 0xee, 0xab, 0x1b, 0xe9, 0x5a, 0xa0, 0x73, 0x30, 0x55, 0x26, 0xc0, 0x88}, "ab", "fnv\x05\xd2(\xcbi\x10\x1a\x8c\xafx\x91+pNJ\x14\x1e"},
81 {[]byte{0xa6, 0x8b, 0xb2, 0xa4, 0x34, 0x8b, 0x58, 0x22, 0x83, 0x6d, 0xbc, 0x78, 0xc6, 0xae, 0xe7, 0x3b}, "abc", "fnv\x05\xd2(\xcbi\x10\x1a\x8c\xafx\x91+pNJ\x14\x1e"},
82 }
83
84 var golden128a = []golden{
85 {[]byte{0x6c, 0x62, 0x27, 0x2e, 0x07, 0xbb, 0x01, 0x42, 0x62, 0xb8, 0x21, 0x75, 0x62, 0x95, 0xc5, 0x8d}, "", "fnv\x06lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
86 {[]byte{0xd2, 0x28, 0xcb, 0x69, 0x6f, 0x1a, 0x8c, 0xaf, 0x78, 0x91, 0x2b, 0x70, 0x4e, 0x4a, 0x89, 0x64}, "a", "fnv\x06lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
87 {[]byte{0x08, 0x80, 0x95, 0x44, 0xbb, 0xab, 0x1b, 0xe9, 0x5a, 0xa0, 0x73, 0x30, 0x55, 0xb6, 0x9a, 0x62}, "ab", "fnv\x06\xd2(\xcbio\x1a\x8c\xafx\x91+pNJ\x89d"},
88 {[]byte{0xa6, 0x8d, 0x62, 0x2c, 0xec, 0x8b, 0x58, 0x22, 0x83, 0x6d, 0xbc, 0x79, 0x77, 0xaf, 0x7f, 0x3b}, "abc", "fnv\x06\xd2(\xcbio\x1a\x8c\xafx\x91+pNJ\x89d"},
89 }
90
91 func TestGolden32(t *testing.T) {
92 testGolden(t, New32(), golden32)
93 }
94
95 func TestGolden32a(t *testing.T) {
96 testGolden(t, New32a(), golden32a)
97 }
98
99 func TestGolden64(t *testing.T) {
100 testGolden(t, New64(), golden64)
101 }
102
103 func TestGolden64a(t *testing.T) {
104 testGolden(t, New64a(), golden64a)
105 }
106
107 func TestGolden128(t *testing.T) {
108 testGolden(t, New128(), golden128)
109 }
110
111 func TestGolden128a(t *testing.T) {
112 testGolden(t, New128a(), golden128a)
113 }
114
115 func testGolden(t *testing.T, hash hash.Hash, gold []golden) {
116 for _, g := range gold {
117 hash.Reset()
118 done, error := hash.Write([]byte(g.in))
119 if error != nil {
120 t.Fatalf("write error: %s", error)
121 }
122 if done != len(g.in) {
123 t.Fatalf("wrote only %d out of %d bytes", done, len(g.in))
124 }
125 if actual := hash.Sum(nil); !bytes.Equal(g.out, actual) {
126 t.Errorf("hash(%q) = 0x%x want 0x%x", g.in, actual, g.out)
127 }
128 }
129 }
130
131 func TestGoldenMarshal(t *testing.T) {
132 tests := []struct {
133 name string
134 newHash func() hash.Hash
135 gold []golden
136 }{
137 {"32", func() hash.Hash { return New32() }, golden32},
138 {"32a", func() hash.Hash { return New32a() }, golden32a},
139 {"64", func() hash.Hash { return New64() }, golden64},
140 {"64a", func() hash.Hash { return New64a() }, golden64a},
141 {"128", func() hash.Hash { return New128() }, golden128},
142 {"128a", func() hash.Hash { return New128a() }, golden128a},
143 }
144 for _, tt := range tests {
145 t.Run(tt.name, func(t *testing.T) {
146 for _, g := range tt.gold {
147 h := tt.newHash()
148 h2 := tt.newHash()
149
150 io.WriteString(h, g.in[:len(g.in)/2])
151
152 state, err := h.(encoding.BinaryMarshaler).MarshalBinary()
153 if err != nil {
154 t.Errorf("could not marshal: %v", err)
155 continue
156 }
157
158 stateAppend, err := h.(encoding.BinaryAppender).AppendBinary(make([]byte, 4, 32))
159 if err != nil {
160 t.Errorf("could not marshal: %v", err)
161 continue
162 }
163 stateAppend = stateAppend[4:]
164
165 if string(state) != g.halfState {
166 t.Errorf("checksum(%q) state = %q, want %q", g.in, state, g.halfState)
167 continue
168 }
169
170 if string(stateAppend) != g.halfState {
171 t.Errorf("checksum(%q) state = %q, want %q", g.in, stateAppend, g.halfState)
172 continue
173 }
174
175 if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state); err != nil {
176 t.Errorf("could not unmarshal: %v", err)
177 continue
178 }
179
180 io.WriteString(h, g.in[len(g.in)/2:])
181 io.WriteString(h2, g.in[len(g.in)/2:])
182
183 if actual, actual2 := h.Sum(nil), h2.Sum(nil); !bytes.Equal(actual, actual2) {
184 t.Errorf("hash(%q) = 0x%x != marshaled 0x%x", g.in, actual, actual2)
185 }
186 }
187 })
188 }
189 }
190
191 func TestIntegrity32(t *testing.T) {
192 testIntegrity(t, New32())
193 }
194
195 func TestIntegrity32a(t *testing.T) {
196 testIntegrity(t, New32a())
197 }
198
199 func TestIntegrity64(t *testing.T) {
200 testIntegrity(t, New64())
201 }
202
203 func TestIntegrity64a(t *testing.T) {
204 testIntegrity(t, New64a())
205 }
206 func TestIntegrity128(t *testing.T) {
207 testIntegrity(t, New128())
208 }
209
210 func TestIntegrity128a(t *testing.T) {
211 testIntegrity(t, New128a())
212 }
213
214 func testIntegrity(t *testing.T, h hash.Hash) {
215 data := []byte{'1', '2', 3, 4, 5}
216 h.Write(data)
217 sum := h.Sum(nil)
218
219 if size := h.Size(); size != len(sum) {
220 t.Fatalf("Size()=%d but len(Sum())=%d", size, len(sum))
221 }
222
223 if a := h.Sum(nil); !bytes.Equal(sum, a) {
224 t.Fatalf("first Sum()=0x%x, second Sum()=0x%x", sum, a)
225 }
226
227 h.Reset()
228 h.Write(data)
229 if a := h.Sum(nil); !bytes.Equal(sum, a) {
230 t.Fatalf("Sum()=0x%x, but after Reset() Sum()=0x%x", sum, a)
231 }
232
233 h.Reset()
234 h.Write(data[:2])
235 h.Write(data[2:])
236 if a := h.Sum(nil); !bytes.Equal(sum, a) {
237 t.Fatalf("Sum()=0x%x, but with partial writes, Sum()=0x%x", sum, a)
238 }
239
240 switch h.Size() {
241 case 4:
242 sum32 := h.(hash.Hash32).Sum32()
243 if sum32 != binary.BigEndian.Uint32(sum) {
244 t.Fatalf("Sum()=0x%x, but Sum32()=0x%x", sum, sum32)
245 }
246 case 8:
247 sum64 := h.(hash.Hash64).Sum64()
248 if sum64 != binary.BigEndian.Uint64(sum) {
249 t.Fatalf("Sum()=0x%x, but Sum64()=0x%x", sum, sum64)
250 }
251 case 16:
252
253 }
254 }
255
256 func BenchmarkFnv32KB(b *testing.B) {
257 benchmarkKB(b, New32())
258 }
259
260 func BenchmarkFnv32aKB(b *testing.B) {
261 benchmarkKB(b, New32a())
262 }
263
264 func BenchmarkFnv64KB(b *testing.B) {
265 benchmarkKB(b, New64())
266 }
267
268 func BenchmarkFnv64aKB(b *testing.B) {
269 benchmarkKB(b, New64a())
270 }
271
272 func BenchmarkFnv128KB(b *testing.B) {
273 benchmarkKB(b, New128())
274 }
275
276 func BenchmarkFnv128aKB(b *testing.B) {
277 benchmarkKB(b, New128a())
278 }
279
280 func benchmarkKB(b *testing.B, h hash.Hash) {
281 b.SetBytes(1024)
282 data := make([]byte, 1024)
283 for i := range data {
284 data[i] = byte(i)
285 }
286 in := make([]byte, 0, h.Size())
287
288 b.ResetTimer()
289 for i := 0; i < b.N; i++ {
290 h.Reset()
291 h.Write(data)
292 h.Sum(in)
293 }
294 }
295
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