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Source file src/hash/fnv/fnv_test.go

Documentation: hash/fnv

  // Copyright 2011 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package fnv
  
  import (
  	"bytes"
  	"encoding/binary"
  	"hash"
  	"testing"
  )
  
  type golden struct {
  	sum  []byte
  	text string
  }
  
  var golden32 = []golden{
  	{[]byte{0x81, 0x1c, 0x9d, 0xc5}, ""},
  	{[]byte{0x05, 0x0c, 0x5d, 0x7e}, "a"},
  	{[]byte{0x70, 0x77, 0x2d, 0x38}, "ab"},
  	{[]byte{0x43, 0x9c, 0x2f, 0x4b}, "abc"},
  }
  
  var golden32a = []golden{
  	{[]byte{0x81, 0x1c, 0x9d, 0xc5}, ""},
  	{[]byte{0xe4, 0x0c, 0x29, 0x2c}, "a"},
  	{[]byte{0x4d, 0x25, 0x05, 0xca}, "ab"},
  	{[]byte{0x1a, 0x47, 0xe9, 0x0b}, "abc"},
  }
  
  var golden64 = []golden{
  	{[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, ""},
  	{[]byte{0xaf, 0x63, 0xbd, 0x4c, 0x86, 0x01, 0xb7, 0xbe}, "a"},
  	{[]byte{0x08, 0x32, 0x67, 0x07, 0xb4, 0xeb, 0x37, 0xb8}, "ab"},
  	{[]byte{0xd8, 0xdc, 0xca, 0x18, 0x6b, 0xaf, 0xad, 0xcb}, "abc"},
  }
  
  var golden64a = []golden{
  	{[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, ""},
  	{[]byte{0xaf, 0x63, 0xdc, 0x4c, 0x86, 0x01, 0xec, 0x8c}, "a"},
  	{[]byte{0x08, 0x9c, 0x44, 0x07, 0xb5, 0x45, 0x98, 0x6a}, "ab"},
  	{[]byte{0xe7, 0x1f, 0xa2, 0x19, 0x05, 0x41, 0x57, 0x4b}, "abc"},
  }
  
  var golden128 = []golden{
  	{[]byte{0x6c, 0x62, 0x27, 0x2e, 0x07, 0xbb, 0x01, 0x42, 0x62, 0xb8, 0x21, 0x75, 0x62, 0x95, 0xc5, 0x8d}, ""},
  	{[]byte{0xd2, 0x28, 0xcb, 0x69, 0x10, 0x1a, 0x8c, 0xaf, 0x78, 0x91, 0x2b, 0x70, 0x4e, 0x4a, 0x14, 0x1e}, "a"},
  	{[]byte{0x8, 0x80, 0x94, 0x5a, 0xee, 0xab, 0x1b, 0xe9, 0x5a, 0xa0, 0x73, 0x30, 0x55, 0x26, 0xc0, 0x88}, "ab"},
  	{[]byte{0xa6, 0x8b, 0xb2, 0xa4, 0x34, 0x8b, 0x58, 0x22, 0x83, 0x6d, 0xbc, 0x78, 0xc6, 0xae, 0xe7, 0x3b}, "abc"},
  }
  
  var golden128a = []golden{
  	{[]byte{0x6c, 0x62, 0x27, 0x2e, 0x07, 0xbb, 0x01, 0x42, 0x62, 0xb8, 0x21, 0x75, 0x62, 0x95, 0xc5, 0x8d}, ""},
  	{[]byte{0xd2, 0x28, 0xcb, 0x69, 0x6f, 0x1a, 0x8c, 0xaf, 0x78, 0x91, 0x2b, 0x70, 0x4e, 0x4a, 0x89, 0x64}, "a"},
  	{[]byte{0x08, 0x80, 0x95, 0x44, 0xbb, 0xab, 0x1b, 0xe9, 0x5a, 0xa0, 0x73, 0x30, 0x55, 0xb6, 0x9a, 0x62}, "ab"},
  	{[]byte{0xa6, 0x8d, 0x62, 0x2c, 0xec, 0x8b, 0x58, 0x22, 0x83, 0x6d, 0xbc, 0x79, 0x77, 0xaf, 0x7f, 0x3b}, "abc"},
  }
  
  func TestGolden32(t *testing.T) {
  	testGolden(t, New32(), golden32)
  }
  
  func TestGolden32a(t *testing.T) {
  	testGolden(t, New32a(), golden32a)
  }
  
  func TestGolden64(t *testing.T) {
  	testGolden(t, New64(), golden64)
  }
  
  func TestGolden64a(t *testing.T) {
  	testGolden(t, New64a(), golden64a)
  }
  
  func TestGolden128(t *testing.T) {
  	testGolden(t, New128(), golden128)
  }
  
  func TestGolden128a(t *testing.T) {
  	testGolden(t, New128a(), golden128a)
  }
  
  func testGolden(t *testing.T, hash hash.Hash, gold []golden) {
  	for _, g := range gold {
  		hash.Reset()
  		done, error := hash.Write([]byte(g.text))
  		if error != nil {
  			t.Fatalf("write error: %s", error)
  		}
  		if done != len(g.text) {
  			t.Fatalf("wrote only %d out of %d bytes", done, len(g.text))
  		}
  		if actual := hash.Sum(nil); !bytes.Equal(g.sum, actual) {
  			t.Errorf("hash(%q) = 0x%x want 0x%x", g.text, actual, g.sum)
  		}
  	}
  }
  
  func TestIntegrity32(t *testing.T) {
  	testIntegrity(t, New32())
  }
  
  func TestIntegrity32a(t *testing.T) {
  	testIntegrity(t, New32a())
  }
  
  func TestIntegrity64(t *testing.T) {
  	testIntegrity(t, New64())
  }
  
  func TestIntegrity64a(t *testing.T) {
  	testIntegrity(t, New64a())
  }
  func TestIntegrity128(t *testing.T) {
  	testIntegrity(t, New128())
  }
  
  func TestIntegrity128a(t *testing.T) {
  	testIntegrity(t, New128a())
  }
  
  func testIntegrity(t *testing.T, h hash.Hash) {
  	data := []byte{'1', '2', 3, 4, 5}
  	h.Write(data)
  	sum := h.Sum(nil)
  
  	if size := h.Size(); size != len(sum) {
  		t.Fatalf("Size()=%d but len(Sum())=%d", size, len(sum))
  	}
  
  	if a := h.Sum(nil); !bytes.Equal(sum, a) {
  		t.Fatalf("first Sum()=0x%x, second Sum()=0x%x", sum, a)
  	}
  
  	h.Reset()
  	h.Write(data)
  	if a := h.Sum(nil); !bytes.Equal(sum, a) {
  		t.Fatalf("Sum()=0x%x, but after Reset() Sum()=0x%x", sum, a)
  	}
  
  	h.Reset()
  	h.Write(data[:2])
  	h.Write(data[2:])
  	if a := h.Sum(nil); !bytes.Equal(sum, a) {
  		t.Fatalf("Sum()=0x%x, but with partial writes, Sum()=0x%x", sum, a)
  	}
  
  	switch h.Size() {
  	case 4:
  		sum32 := h.(hash.Hash32).Sum32()
  		if sum32 != binary.BigEndian.Uint32(sum) {
  			t.Fatalf("Sum()=0x%x, but Sum32()=0x%x", sum, sum32)
  		}
  	case 8:
  		sum64 := h.(hash.Hash64).Sum64()
  		if sum64 != binary.BigEndian.Uint64(sum) {
  			t.Fatalf("Sum()=0x%x, but Sum64()=0x%x", sum, sum64)
  		}
  	case 16:
  		// There's no Sum128 function, so we don't need to test anything here.
  	}
  }
  
  func BenchmarkFnv32KB(b *testing.B) {
  	benchmarkKB(b, New32())
  }
  
  func BenchmarkFnv32aKB(b *testing.B) {
  	benchmarkKB(b, New32a())
  }
  
  func BenchmarkFnv64KB(b *testing.B) {
  	benchmarkKB(b, New64())
  }
  
  func BenchmarkFnv64aKB(b *testing.B) {
  	benchmarkKB(b, New64a())
  }
  
  func BenchmarkFnv128KB(b *testing.B) {
  	benchmarkKB(b, New128())
  }
  
  func BenchmarkFnv128aKB(b *testing.B) {
  	benchmarkKB(b, New128a())
  }
  
  func benchmarkKB(b *testing.B, h hash.Hash) {
  	b.SetBytes(1024)
  	data := make([]byte, 1024)
  	for i := range data {
  		data[i] = byte(i)
  	}
  	in := make([]byte, 0, h.Size())
  
  	b.ResetTimer()
  	for i := 0; i < b.N; i++ {
  		h.Reset()
  		h.Write(data)
  		h.Sum(in)
  	}
  }
  

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