Source file
src/hash/adler32/adler32_test.go
1
2
3
4
5 package adler32
6
7 import (
8 "encoding"
9 "io"
10 "strings"
11 "testing"
12 )
13
14 var golden = []struct {
15 out uint32
16 in string
17 halfState string
18 }{
19 {0x00000001, "", "adl\x01\x00\x00\x00\x01"},
20 {0x00620062, "a", "adl\x01\x00\x00\x00\x01"},
21 {0x012600c4, "ab", "adl\x01\x00b\x00b"},
22 {0x024d0127, "abc", "adl\x01\x00b\x00b"},
23 {0x03d8018b, "abcd", "adl\x01\x01&\x00\xc4"},
24 {0x05c801f0, "abcde", "adl\x01\x01&\x00\xc4"},
25 {0x081e0256, "abcdef", "adl\x01\x02M\x01'"},
26 {0x0adb02bd, "abcdefg", "adl\x01\x02M\x01'"},
27 {0x0e000325, "abcdefgh", "adl\x01\x03\xd8\x01\x8b"},
28 {0x118e038e, "abcdefghi", "adl\x01\x03\xd8\x01\x8b"},
29 {0x158603f8, "abcdefghij", "adl\x01\x05\xc8\x01\xf0"},
30 {0x3f090f02, "Discard medicine more than two years old.", "adl\x01NU\a\x87"},
31 {0x46d81477, "He who has a shady past knows that nice guys finish last.", "adl\x01\x89\x8e\t\xe9"},
32 {0x40ee0ee1, "I wouldn't marry him with a ten foot pole.", "adl\x01R\t\ag"},
33 {0x16661315, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave", "adl\x01\u007f\xbb\t\x10"},
34 {0x5b2e1480, "The days of the digital watch are numbered. -Tom Stoppard", "adl\x01\x99:\n~"},
35 {0x8c3c09ea, "Nepal premier won't resign.", "adl\x01\"\x05\x05\x05"},
36 {0x45ac18fd, "For every action there is an equal and opposite government program.", "adl\x01\xcc\xfa\f\x00"},
37 {0x53c61462, "His money is twice tainted: 'taint yours and 'taint mine.", "adl\x01\x93\xa9\n\b"},
38 {0x7e511e63, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977", "adl\x01e\xf5\x10\x14"},
39 {0xe4801a6a, "It's a tiny change to the code and not completely disgusting. - Bob Manchek", "adl\x01\xee\x00\f\xb2"},
40 {0x61b507df, "size: a.out: bad magic", "adl\x01\x1a\xfc\x04\x1d"},
41 {0xb8631171, "The major problem is with sendmail. -Mark Horton", "adl\x01mi\b\xdc"},
42 {0x8b5e1904, "Give me a rock, paper and scissors and I will move the world. CCFestoon", "adl\x01\xe3\n\f\x9f"},
43 {0x7cc6102b, "If the enemy is within range, then so are you.", "adl\x01_\xe0\b\x1e"},
44 {0x700318e7, "It's well we cannot hear the screams/That we create in others' dreams.", "adl\x01ۘ\f\x87"},
45 {0x1e601747, "You remind me of a TV show, but that's all right: I watch it anyway.", "adl\x01\xcc}\v\x83"},
46 {0xb55b0b09, "C is as portable as Stonehedge!!", "adl\x01,^\x05\xad"},
47 {0x39111dd0, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley", "adl\x01M\xd1\x0e\xc8"},
48 {0x91dd304f, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction. Lewis-Randall Rule", "adl\x01#\xd8\x17\xd7"},
49 {0x2e5d1316, "How can you write a big system without C++? -Paul Glick", "adl\x01\x8fU\n\x0f"},
50 {0xd0201df6, "'Invariant assertions' is the most elegant programming technique! -Tom Szymanski", "adl\x01/\x98\x0e\xc4"},
51 {0x211297c8, strings.Repeat("\xff", 5548) + "8", "adl\x01\x9a\xa6\xcb\xc1"},
52 {0xbaa198c8, strings.Repeat("\xff", 5549) + "9", "adl\x01gu\xcc\xc0"},
53 {0x553499be, strings.Repeat("\xff", 5550) + "0", "adl\x01gu\xcc\xc0"},
54 {0xf0c19abe, strings.Repeat("\xff", 5551) + "1", "adl\x015CͿ"},
55 {0x8d5c9bbe, strings.Repeat("\xff", 5552) + "2", "adl\x015CͿ"},
56 {0x2af69cbe, strings.Repeat("\xff", 5553) + "3", "adl\x01\x04\x10ξ"},
57 {0xc9809dbe, strings.Repeat("\xff", 5554) + "4", "adl\x01\x04\x10ξ"},
58 {0x69189ebe, strings.Repeat("\xff", 5555) + "5", "adl\x01\xd3\xcdϽ"},
59 {0x86af0001, strings.Repeat("\x00", 1e5), "adl\x01\xc3P\x00\x01"},
60 {0x79660b4d, strings.Repeat("a", 1e5), "adl\x01\x81k\x05\xa7"},
61 {0x110588ee, strings.Repeat("ABCDEFGHIJKLMNOPQRSTUVWXYZ", 1e4), "adl\x01e\xd2\xc4p"},
62 }
63
64
65
66 func checksum(p []byte) uint32 {
67 s1, s2 := uint32(1), uint32(0)
68 for _, x := range p {
69 s1 = (s1 + uint32(x)) % mod
70 s2 = (s2 + s1) % mod
71 }
72 return s2<<16 | s1
73 }
74
75 func TestGolden(t *testing.T) {
76 for _, g := range golden {
77 in := g.in
78 if len(in) > 220 {
79 in = in[:100] + "..." + in[len(in)-100:]
80 }
81 p := []byte(g.in)
82 if got := checksum(p); got != g.out {
83 t.Errorf("simple implementation: checksum(%q) = 0x%x want 0x%x", in, got, g.out)
84 continue
85 }
86 if got := Checksum(p); got != g.out {
87 t.Errorf("optimized implementation: Checksum(%q) = 0x%x want 0x%x", in, got, g.out)
88 continue
89 }
90 }
91 }
92
93 func TestGoldenMarshal(t *testing.T) {
94 for _, g := range golden {
95 h := New()
96 h2 := New()
97
98 io.WriteString(h, g.in[:len(g.in)/2])
99
100 state, err := h.(encoding.BinaryMarshaler).MarshalBinary()
101 if err != nil {
102 t.Errorf("could not marshal: %v", err)
103 continue
104 }
105
106 if string(state) != g.halfState {
107 t.Errorf("checksum(%q) state = %q, want %q", g.in, state, g.halfState)
108 continue
109 }
110
111 if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state); err != nil {
112 t.Errorf("could not unmarshal: %v", err)
113 continue
114 }
115
116 io.WriteString(h, g.in[len(g.in)/2:])
117 io.WriteString(h2, g.in[len(g.in)/2:])
118
119 if h.Sum32() != h2.Sum32() {
120 t.Errorf("checksum(%q) = 0x%x != marshaled (0x%x)", g.in, h.Sum32(), h2.Sum32())
121 }
122 }
123 }
124
125 func BenchmarkAdler32KB(b *testing.B) {
126 b.SetBytes(1024)
127 data := make([]byte, 1024)
128 for i := range data {
129 data[i] = byte(i)
130 }
131 h := New()
132 in := make([]byte, 0, h.Size())
133
134 b.ResetTimer()
135 for i := 0; i < b.N; i++ {
136 h.Reset()
137 h.Write(data)
138 h.Sum(in)
139 }
140 }
141
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