// Copyright 2022 Huawei Cloud Computing Technologies Co., Ltd.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

package rand

import (

"crypto/rand"

"encoding/binary"

rand2 "math/rand"

)

const (

rngMask = (1 << 63) - 1

)

/* #nosec */

var defaultRand = rand2.New(&Source{})

type Source struct {

}

func (s Source) Int63() int64 {

var i uint64

err := binary.Read(rand.Reader, binary.LittleEndian, &i)

if err != nil {

return 0

}

return int64(i & rngMask)

}

func (s Source) Seed(int64) {

}

func Int63() int64 {

return defaultRand.Int63()

}

func Intn(n int) int {

return defaultRand.Intn(n)

}

func Int63n(n int64) int64 {

return defaultRand.Int63n(n)

}

func Float64() float64 {

return defaultRand.Float64()

}

func Int31n(n int32) int32 {

return defaultRand.Int31n(n)

}