github.com/eframework-cn/EP.GO.UTIL@v1.0.0/xmath/xmath.go (about)

     1  //-----------------------------------------------------------------------//
     2  //                     GNU GENERAL PUBLIC LICENSE                        //
     3  //                        Version 2, June 1991                           //
     4  //                                                                       //
     5  // Copyright (C) EFramework, https://eframework.cn, All rights reserved. //
     6  // Everyone is permitted to copy and distribute verbatim copies          //
     7  // of this license document, but changing it is not allowed.             //
     8  //                   SEE LICENSE.md FOR MORE DETAILS.                    //
     9  //-----------------------------------------------------------------------//
    10  
    11  // 封装了一些常用的数学函数.
    12  package xmath
    13  
    14  import (
    15  	"encoding/binary"
    16  	"math/rand"
    17  )
    18  
    19  const (
    20  	INT8_MIN   = -0x7f - 1
    21  	INT16_MIN  = -0x7fff - 1
    22  	INT32_MIN  = -0x7fffffff - 1
    23  	INT64_MIN  = -0x7fffffffffffffff - 1
    24  	INT8_MAX   = 0x7f
    25  	INT16_MAX  = 0x7fff
    26  	INT32_MAX  = 0x7fffffff
    27  	INT64_MAX  = 0x7fffffffffffffff
    28  	UINT8_MAX  = 0xff
    29  	UINT16_MAX = 0xffff
    30  	UINT32_MAX = 0xffffffff
    31  	UINT64_MAX = 0xffffffffffffffff
    32  )
    33  
    34  var (
    35  	BYTE_ORDER binary.ByteOrder = &binary.LittleEndian // 字节序（小端）
    36  )
    37  
    38  // 最大值
    39  func MaxValue(a int, b int) int {
    40  	if a >= b {
    41  		return a
    42  	}
    43  	return b
    44  }
    45  
    46  // 最小值
    47  func MinValue(a int, b int) int {
    48  	if a >= b {
    49  		return b
    50  	}
    51  	return a
    52  }
    53  
    54  // 随机数
    55  //	min: 左区间
    56  //	max: 右区间
    57  func RandInt(min int, max int) int {
    58  	if min >= max {
    59  		return max
    60  	}
    61  	return rand.Intn(max-min) + min
    62  }
    63  
    64  // uint32转字节数组
    65  func Uint32ToBytes(value uint32) []byte {
    66  	bytes := make([]byte, 4)
    67  	BYTE_ORDER.PutUint32(bytes, value)
    68  	return bytes
    69  }
    70  
    71  // 字节数组转uint32
    72  func Uint32FromBytes(value []byte) uint32 {
    73  	return BYTE_ORDER.Uint32(value)
    74  }