libgo/go/hash/fnv/fnv_test.go

   1 // Copyright 2011 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.
   4
   5 package fnv
   6
   7 import (
   8         "bytes"
   9         "encoding/binary"
  10         "hash"
  11         "testing"
  12 )
  13
  14 type golden struct {
  15         sum  []byte
  16         text string
  17 }
  18
  19 var golden32 = []golden{
  20         {[]byte{0x81, 0x1c, 0x9d, 0xc5}, ""},
  21         {[]byte{0x05, 0x0c, 0x5d, 0x7e}, "a"},
  22         {[]byte{0x70, 0x77, 0x2d, 0x38}, "ab"},
  23         {[]byte{0x43, 0x9c, 0x2f, 0x4b}, "abc"},
  24 }
  25
  26 var golden32a = []golden{
  27         {[]byte{0x81, 0x1c, 0x9d, 0xc5}, ""},
  28         {[]byte{0xe4, 0x0c, 0x29, 0x2c}, "a"},
  29         {[]byte{0x4d, 0x25, 0x05, 0xca}, "ab"},
  30         {[]byte{0x1a, 0x47, 0xe9, 0x0b}, "abc"},
  31 }
  32
  33 var golden64 = []golden{
  34         {[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, ""},
  35         {[]byte{0xaf, 0x63, 0xbd, 0x4c, 0x86, 0x01, 0xb7, 0xbe}, "a"},
  36         {[]byte{0x08, 0x32, 0x67, 0x07, 0xb4, 0xeb, 0x37, 0xb8}, "ab"},
  37         {[]byte{0xd8, 0xdc, 0xca, 0x18, 0x6b, 0xaf, 0xad, 0xcb}, "abc"},
  38 }
  39
  40 var golden64a = []golden{
  41         {[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, ""},
  42         {[]byte{0xaf, 0x63, 0xdc, 0x4c, 0x86, 0x01, 0xec, 0x8c}, "a"},
  43         {[]byte{0x08, 0x9c, 0x44, 0x07, 0xb5, 0x45, 0x98, 0x6a}, "ab"},
  44         {[]byte{0xe7, 0x1f, 0xa2, 0x19, 0x05, 0x41, 0x57, 0x4b}, "abc"},
  45 }
  46
  47 func TestGolden32(t *testing.T) {
  48         testGolden(t, New32(), golden32)
  49 }
  50
  51 func TestGolden32a(t *testing.T) {
  52         testGolden(t, New32a(), golden32a)
  53 }
  54
  55 func TestGolden64(t *testing.T) {
  56         testGolden(t, New64(), golden64)
  57 }
  58
  59 func TestGolden64a(t *testing.T) {
  60         testGolden(t, New64a(), golden64a)
  61 }
  62
  63 func testGolden(t *testing.T, hash hash.Hash, gold []golden) {
  64         for _, g := range gold {
  65                 hash.Reset()
  66                 done, error := hash.Write([]byte(g.text))
  67                 if error != nil {
  68                         t.Fatalf("write error: %s", error)
  69                 }
  70                 if done != len(g.text) {
  71                         t.Fatalf("wrote only %d out of %d bytes", done, len(g.text))
  72                 }
  73                 if actual := hash.Sum(nil); !bytes.Equal(g.sum, actual) {
  74                         t.Errorf("hash(%q) = 0x%x want 0x%x", g.text, actual, g.sum)
  75                 }
  76         }
  77 }
  78
  79 func TestIntegrity32(t *testing.T) {
  80         testIntegrity(t, New32())
  81 }
  82
  83 func TestIntegrity32a(t *testing.T) {
  84         testIntegrity(t, New32a())
  85 }
  86
  87 func TestIntegrity64(t *testing.T) {
  88         testIntegrity(t, New64())
  89 }
  90
  91 func TestIntegrity64a(t *testing.T) {
  92         testIntegrity(t, New64a())
  93 }
  94
  95 func testIntegrity(t *testing.T, h hash.Hash) {
  96         data := []byte{'1', '2', 3, 4, 5}
  97         h.Write(data)
  98         sum := h.Sum(nil)
  99
 100         if size := h.Size(); size != len(sum) {
 101                 t.Fatalf("Size()=%d but len(Sum())=%d", size, len(sum))
 102         }
 103
 104         if a := h.Sum(nil); !bytes.Equal(sum, a) {
 105                 t.Fatalf("first Sum()=0x%x, second Sum()=0x%x", sum, a)
 106         }
 107
 108         h.Reset()
 109         h.Write(data)
 110         if a := h.Sum(nil); !bytes.Equal(sum, a) {
 111                 t.Fatalf("Sum()=0x%x, but after Reset() Sum()=0x%x", sum, a)
 112         }
 113
 114         h.Reset()
 115         h.Write(data[:2])
 116         h.Write(data[2:])
 117         if a := h.Sum(nil); !bytes.Equal(sum, a) {
 118                 t.Fatalf("Sum()=0x%x, but with partial writes, Sum()=0x%x", sum, a)
 119         }
 120
 121         switch h.Size() {
 122         case 4:
 123                 sum32 := h.(hash.Hash32).Sum32()
 124                 if sum32 != binary.BigEndian.Uint32(sum) {
 125                         t.Fatalf("Sum()=0x%x, but Sum32()=0x%x", sum, sum32)
 126                 }
 127         case 8:
 128                 sum64 := h.(hash.Hash64).Sum64()
 129                 if sum64 != binary.BigEndian.Uint64(sum) {
 130                         t.Fatalf("Sum()=0x%x, but Sum64()=0x%x", sum, sum64)
 131                 }
 132         }
 133 }
 134
 135 func BenchmarkFnv32KB(b *testing.B) {
 136         benchmarkKB(b, New32())
 137 }
 138
 139 func BenchmarkFnv32aKB(b *testing.B) {
 140         benchmarkKB(b, New32a())
 141 }
 142
 143 func BenchmarkFnv64KB(b *testing.B) {
 144         benchmarkKB(b, New64())
 145 }
 146
 147 func BenchmarkFnv64aKB(b *testing.B) {
 148         benchmarkKB(b, New64a())
 149 }
 150
 151 func benchmarkKB(b *testing.B, h hash.Hash) {
 152         b.SetBytes(1024)
 153         data := make([]byte, 1024)
 154         for i := range data {
 155                 data[i] = byte(i)
 156         }
 157         in := make([]byte, 0, h.Size())
 158
 159         b.ResetTimer()
 160         for i := 0; i < b.N; i++ {
 161                 h.Reset()
 162                 h.Write(data)
 163                 h.Sum(in)
 164         }
 165 }