/
writer_test.go
195 lines (176 loc) · 3.99 KB
/
writer_test.go
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package bitstream
import (
"bytes"
"fmt"
"math/rand"
"testing"
"github.com/dgryski/go-bits"
gryski "github.com/dgryski/go-bitstream"
)
type nullWriter struct{}
var bn = make([]byte, 32*1024, 32*1024)
func (nullWriter) Write(b []byte) (int, error) {
if len(bn) < len(b) {
bn = make([]byte, len(b)*2, len(b)*2)
}
copy(bn, b) // simulate a writer that actually does stuff
return len(b), nil
}
func (nullWriter) WriteByte(b byte) error {
return nil
}
const testWriteBits = 100 * 1024 * 1024
func BenchmarkWriteByteWriter001(b *testing.B) {
w := NewByteWriter(nullWriter{})
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/2; j++ {
w.WriteOne()
w.WriteZero()
}
w.Flush()
}
}
func BenchmarkWriteWriter001(b *testing.B) {
w := NewWriter(nullWriter{})
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/2; j++ {
w.WriteOne()
w.WriteZero()
}
w.Flush()
}
}
func BenchmarkGryskiWriter001(b *testing.B) {
w := gryski.NewWriter(nullWriter{})
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/2; j++ {
w.WriteBit(gryski.One)
w.WriteBit(gryski.Zero)
}
w.Flush(gryski.Zero)
}
}
func BenchmarkWriteWriter002(b *testing.B) {
w := NewWriter(nullWriter{})
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/2; j++ {
w.WriteBit(O)
w.WriteBit(Z)
}
w.Flush()
}
}
func BenchmarkWriteWriter003(b *testing.B) {
w := NewWriter(nullWriter{})
v := uint64(0x75)
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/5; j++ {
w.WriteBits(v, 5)
}
w.Flush()
}
}
func BenchmarkGryskiWriter003(b *testing.B) {
w := gryski.NewWriter(nullWriter{})
v := uint64(0x75)
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/5; j++ {
w.WriteBits(v, 5)
}
w.Flush(gryski.Zero)
}
}
func BenchmarkByteWriter004(b *testing.B) {
w := NewByteWriter(nullWriter{})
v := uint64(0x75757575)
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/25; j++ {
w.WriteBits(v, 35)
}
w.Flush()
}
}
func BenchmarkWriteWriter004(b *testing.B) {
w := NewWriter(nullWriter{})
v := uint64(0x75757575)
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/25; j++ {
w.WriteBits(v, 35)
}
w.Flush()
}
}
func BenchmarkGryskiWriter004(b *testing.B) {
w := gryski.NewWriter(nullWriter{})
v := uint64(0x75757575)
for i := 0; i < b.N; i++ {
for j := 0; j < testWriteBits/25; j++ {
w.WriteBits(v, 35)
}
w.Flush(gryski.Zero)
}
}
func BenchmarkReader(b *testing.B) {
for i := 0; i < b.N; i++ {
rnd := rand.NewSource(1234)
rd := NewReader(bytes.NewReader(random))
for i := 0; i < 1000000; i++ {
l, err := rd.ReadBits(6)
if err != nil {
b.Errorf("ReadBits returned error %v", err)
return
}
n, err := rd.ReadBits(uint(l))
if err != nil {
b.Errorf("ReadBits returned error %v", err)
return
}
rn := uint64(rnd.Int63())
if n != rn {
b.Errorf("random data decoding failed at pos %v, len %v, got %x, expected %x (diff %x)", i, l, n, rn, n-rn)
return
}
}
}
}
func BenchmarkGryskiReader(b *testing.B) {
for i := 0; i < b.N; i++ {
rnd := rand.NewSource(1234)
rd := gryski.NewReader(bytes.NewReader(random))
for i := 0; i < 1000000; i++ {
l, err := rd.ReadBits(6)
if err != nil {
b.Errorf("ReadBits returned error %v", err)
return
}
n, err := rd.ReadBits(int(l))
if err != nil {
b.Errorf("ReadBits returned error %v", err)
return
}
rn := uint64(rnd.Int63())
if n != rn {
b.Errorf("random data decoding failed at pos %v, len %v, got %x, expected %x (diff %x)", i, l, n, rn, n-rn)
return
}
}
}
}
var random = randomBytes()
func randomBytes() []byte {
rnd := rand.NewSource(1234)
w := new(bytes.Buffer)
wr := NewWriter(w)
for i := 0; i < 1000000; i++ {
rn := uint64(rnd.Int63())
l := 64 - bits.Clz(rn)
if err := wr.WriteBits(l, 6); err != nil {
panic(fmt.Errorf("WriteBits returned error %v", err))
}
if err := wr.WriteBits(rn, uint(l)); err != nil {
panic(fmt.Errorf("WriteBits returned error %v", err))
}
}
wr.Flush()
return w.Bytes()
}