36 lines
867 B
Go
36 lines
867 B
Go
package flrstring
|
|
|
|
import (
|
|
"math/rand"
|
|
"time"
|
|
)
|
|
|
|
// Constants and variables for random string generation
|
|
const (
|
|
letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
letterIdxBits = 6
|
|
letterIdxMask = 1<<letterIdxBits - 1
|
|
letterIdxMax = 63 / letterIdxBits
|
|
)
|
|
|
|
var src = rand.NewSource(time.Now().UnixNano())
|
|
|
|
// createRandString creates a random string with the size of n
|
|
// See: http://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang
|
|
func CreateRandString(n int) string {
|
|
b := make([]byte, n)
|
|
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) {
|
|
b[i] = letterBytes[idx]
|
|
i--
|
|
}
|
|
cache >>= letterIdxBits
|
|
remain--
|
|
}
|
|
|
|
return string(b)
|
|
}
|