github.com/bingoohuang/gg@v0.0.0-20240325092523-45da7dee9335/pkg/sqlparse/tidbparser/dependency/util/random.go (about)

     1  // Copyright 2017 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package util
    15  
    16  import (
    17  	"math/rand"
    18  )
    19  
    20  // RandomBuf generates a random string using ASCII characters but avoid separator character.
    21  // See https://github.com/mysql/mysql-server/blob/5.7/mysys_ssl/crypt_genhash_impl.cc#L435
    22  func RandomBuf(size int) []byte {
    23  	buf := make([]byte, size)
    24  	for i := 0; i < size; i++ {
    25  		buf[i] = byte(rand.Intn(127))
    26  		if buf[i] == 0 || buf[i] == byte('$') {
    27  			buf[i]++
    28  		}
    29  	}
    30  	return buf
    31  }