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convert_test.go
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convert_test.go
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package bs
import (
cryptoRand "crypto/rand"
"math/rand"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
var testString = "Albert Einstein: Logic will get you from A to B. Imagination will take you everywhere."
var testBytes = []byte(testString)
func rawBytesToStr(b []byte) string {
return string(b)
}
func rawStrToBytes(s string) []byte {
return []byte(s)
}
// go test -v
func TestBytesToString(t *testing.T) {
asserts := assert.New(t)
data := make([]byte, 1024)
for i := 0; i < 100; i++ {
_, err := cryptoRand.Read(data)
asserts.NoError(err)
asserts.Equal(rawBytesToStr(data), B2S(data))
}
}
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
var src = rand.NewSource(time.Now().UnixNano())
func RandStringBytesMaskImprSrcSB(n int) string {
sb := strings.Builder{}
sb.Grow(n)
// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
sb.WriteByte(letterBytes[idx])
i--
}
cache >>= letterIdxBits
remain--
}
return sb.String()
}
func TestStringToBytes(t *testing.T) {
asserts := assert.New(t)
for i := 0; i < 100; i++ {
s := RandStringBytesMaskImprSrcSB(64)
asserts.Equal(rawStrToBytes(s), S2B(s))
}
}
// go test -v -run=none -bench=^BenchmarkBytesConv -benchmem=true
func BenchmarkBytesConvBytesToStrRaw(b *testing.B) {
for i := 0; i < b.N; i++ {
rawBytesToStr(testBytes)
}
}
func BenchmarkBytesConvBytesToStr(b *testing.B) {
for i := 0; i < b.N; i++ {
B2S(testBytes)
}
}
func BenchmarkBytesConvStrToBytesRaw(b *testing.B) {
for i := 0; i < b.N; i++ {
rawStrToBytes(testString)
}
}
func BenchmarkBytesConvStrToBytes(b *testing.B) {
for i := 0; i < b.N; i++ {
S2B(testString)
}
}