标签：strconv unicodeValByte res totalLens unicodeVal 20220722 可信 secondByte 考试

/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2019-2020. All rights reserved.
 * Description: 上机编程认证
 * Note: 缺省代码仅供参考，可自行决定使用、修改或删除
 * 只能import Go标准库
 */

package main

import (
   "bufio"
   "fmt"
   "io"
   "math"
   "os"
   "strconv"
   "strings"
)

func encodeOne(unicodeVal int) string {
   unicodeValByte := strconv.FormatInt(int64(unicodeVal),2)
   totalLens := len(unicodeValByte)
   needZero := 8 - totalLens - 1
   enStr := "1"
   for i:= 0; i < needZero; i++ {
      enStr +=  "0"
   }
   enStr += unicodeValByte
   decNum,err := strconv.ParseInt(enStr,2,64)
   if err != nil{
      return ""
   }
   res := strconv.FormatInt(decNum,16)
   return res
}


func encodeTwo(unicodeVal int) string{
   unicodeValByte := strconv.FormatInt(int64(unicodeVal),2)
   totalLens := len(unicodeValByte)
   firstByte := unicodeValByte[totalLens-6:totalLens]
   firstByte = "01" + firstByte
   secondLens := totalLens - 6
   needZero := 8 - secondLens - 3
   secondByte := "001"
   for i:= 0; i < needZero; i++ {
      secondByte +=  "0"
   }
   secondByte += unicodeValByte[:secondLens]
   encodeStr := secondByte + firstByte
   decNum,err := strconv.ParseInt(encodeStr,2,64)
   if err != nil{
      return ""
   }
   res := strconv.FormatInt(decNum,16)
   return res
}


func encodeThree(unicodeVal int) string{
   unicodeValByte := strconv.FormatInt(int64(unicodeVal),2)
   totalLens := len(unicodeValByte)
   firstByte := unicodeValByte[totalLens-6:totalLens]
   firstByte = "01" + firstByte
   secondByte := unicodeValByte[totalLens-12:totalLens-6]
   secondByte = "01" + secondByte

   threeLens := totalLens - 12
   needZero := 8 - threeLens - 4
   threeByte := "0001"
   for i:= 0; i < needZero; i++ {
      threeByte +=  "0"
   }
   threeByte += unicodeValByte[:threeLens]
   encodeStr := threeByte + secondByte + firstByte
   decNum,err := strconv.ParseInt(encodeStr,2,64)
   if err != nil{
      return ""
   }
   res := strconv.FormatInt(decNum,16)
   return res
}

func encodeFour(unicodeVal int) string{
   unicodeValByte := strconv.FormatInt(int64(unicodeVal),2)
   totalLens := len(unicodeValByte)
   firstByte := unicodeValByte[totalLens-6:totalLens]
   firstByte = "01" + firstByte
   secondByte := unicodeValByte[totalLens-12:totalLens-6]
   secondByte = "01" + secondByte
   threeByte := unicodeValByte[totalLens-18:totalLens-12]
   threeByte = "01" + threeByte

   fourLens := totalLens - 18
   needZero := 8 - fourLens - 5
   fourByte := "00001"
   for i:= 0; i < needZero; i++ {
      fourByte +=  "0"
   }
   fourByte += unicodeValByte[:fourLens]
   encodeStr := fourByte + threeByte + secondByte + firstByte
   decNum,err := strconv.ParseInt(encodeStr,2,64)
   if err != nil{
      return ""
   }
   res := strconv.FormatInt(decNum,16)
   return res
}

func encodeFive(unicodeVal int) string{
   unicodeValByte := strconv.FormatInt(int64(unicodeVal),2)
   totalLens := len(unicodeValByte)
   firstByte := unicodeValByte[totalLens-6:totalLens]
   firstByte = "01" + firstByte
   secondByte := unicodeValByte[totalLens-12:totalLens-6]
   secondByte = "01" + secondByte
   threeByte := unicodeValByte[totalLens-18:totalLens-12]
   threeByte = "01" + threeByte
   fourByte := unicodeValByte[totalLens-24:totalLens-18]
   fourByte = "01" + fourByte

   fiveLens := totalLens - 24
   needZero := 8 - fiveLens - 6
   fiveByte := "000001"
   for i:= 0; i < needZero; i++ {
      fiveByte +=  "0"
   }
   fiveByte += unicodeValByte[:fiveLens]
   encodeStr := fiveByte + fourByte + threeByte + secondByte + firstByte
   decNum,err := strconv.ParseInt(encodeStr,2,64)
   if err != nil{
      return ""
   }
   res := strconv.FormatInt(decNum,16)
   return res
}



func encodeSix(unicodeVal int) string{
   unicodeValByte := strconv.FormatInt(int64(unicodeVal),2)
   totalLens := len(unicodeValByte)
   firstByte := unicodeValByte[totalLens-6:totalLens]
   firstByte = "01" + firstByte
   secondByte := unicodeValByte[totalLens-12:totalLens-6]
   secondByte = "01" + secondByte
   threeByte := unicodeValByte[totalLens-18:totalLens-12]
   threeByte = "01" + threeByte
   fourByte := unicodeValByte[totalLens-24:totalLens-18]
   fourByte = "01" + fourByte
   fiveByte := unicodeValByte[totalLens-30:totalLens-24]
   fiveByte = "01" + fiveByte

   sixLens := totalLens - 30
   needZero := 8 - sixLens - 7
   sixByte := "0000001"
   for i:= 0; i < needZero; i++ {
      sixByte +=  "0"
   }
   sixByte += unicodeValByte[:sixLens]
   encodeStr := sixByte + fiveByte + fourByte + threeByte + secondByte + firstByte
   decNum,err := strconv.ParseInt(encodeStr,2,64)
   if err != nil{
      return ""
   }
   res := strconv.FormatInt(decNum,16)
   return res
}

// 待实现函数，在此函数中填入答题代码
func utfEncoding(unicodeVal string) string {
   res := ""
   unicodeValInt, err := strconv.Atoi(unicodeVal)
   if err != nil {
      return ""
   }
   oneLimit := int(math.Pow(2, 7))
   twoLimit := int(math.Pow(2, 15))
   if  0 <= unicodeValInt && unicodeValInt < oneLimit {
      res = encodeOne(unicodeValInt)
   } else if oneLimit <= unicodeValInt && unicodeValInt < twoLimit {
      res = encodeTwo(unicodeValInt)
   } else if 2048 <= unicodeValInt && unicodeValInt < 65536 {
      res = encodeThree(unicodeValInt)
   } else if 65536 <= unicodeValInt && unicodeValInt < 2097152 {
      res = encodeFour(unicodeValInt)
   } else if 2097152 <= unicodeValInt && unicodeValInt < 67108864 {
      res = encodeFive(unicodeValInt)
   } else if 67108864 <= unicodeValInt && unicodeValInt < 2147483648 {
      res = encodeSix(unicodeValInt)
   }
   res = strings.ToUpper(res)
   if len(res) % 2 != 0 {
      res = "0" + res
   }
   return res
}

func main() {
   inputReader := bufio.NewReader(os.Stdin)
   unicodeVal, err := inputReader.ReadString('\n')
   if err != nil && err != io.EOF {
      fmt.Println(err.Error())
      return
   }
   unicodeVal = strings.TrimRight(unicodeVal, "\r\n")
   unicodeVal = strings.TrimSpace(unicodeVal)
   fmt.Println(utfEncoding(unicodeVal))
}

标签：strconv,unicodeValByte,res,totalLens,unicodeVal,20220722,可信,secondByte,考试
来源： https://www.cnblogs.com/gongxianjin/p/16510601.html

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