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package xrand
import (
"crypto/rand"
"encoding/base64"
"fmt"
"math/big"
"strings"
)
// Bytes generates random bytes with length n.
func Bytes(n int) []byte {
b := make([]byte, n)
_, err := rand.Reader.Read(b)
if err != nil {
panic(fmt.Sprintf("failed to generate rand bytes: %v", err))
}
return b
}
// String generates a random string with length n.
func String(n int) string {
s := strings.ToValidUTF8(string(Bytes(n)), "_")
s = strings.ReplaceAll(s, "\x00", "_")
if len(s) > n {
return s[:n]
}
if len(s) < n {
// Pad with =
extra := n - len(s)
return s + strings.Repeat("=", extra)
}
return s
}
// Bool returns a randomly generated boolean.
func Bool() bool {
return Int(2) == 1
}
// Int returns a randomly generated integer between [0, max).
func Int(max int) int {
x, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
if err != nil {
panic(fmt.Sprintf("failed to get random int: %v", err))
}
return int(x.Int64())
}
// Base64 returns a randomly generated base64 string of length n.
func Base64(n int) string {
return base64.StdEncoding.EncodeToString(Bytes(n))
}
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