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// 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"},
}
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 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 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)
}
}
}
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 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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