课上考试

Posted 2021-05-13 Li_Ang

数据转换-位串字节数组

utils.c：

#include<stdio.h>
#include<string.h>
#include"utils.h"

int Hex2Char(int fromi,char *toc)
{
    if(fromi>=0&&fromi<=9)
    {
            *toc= fromi+\'0\';
    }
    else if(fromi>=10&&fromi<=15)
    {
            *toc = fromi+\'A\'-10;
    }
    else
    {
        printf("error");
     }
    return 0;
}
int Char2Hex(char fromc,int *toi)
{
        if(fromc>=\'0\'&& fromc<=\'9\')
        {
             *toi= fromc-\'0\';
        }
        else if(fromc>=\'A\'&& fromc<=\'F\')
        {
             *toi= fromc-\'A\'+10;

        }
        else
        {
            printf("error");
        }
        return 0;
}
int ByteArr2BitStr(char *ba,char *bs)
{
    int i,j,L,k,a;
    L = strlen(ba);
    for(j=0;j<L;j++)
    {
        Char2Hex(ba[j],&a);
        for(i=0;i<4;i++)
        {
            bs[3*(j+1)-i+j] = a%2+\'0\';
            a=a/2;
        }
    }
    bs[4*L]=\'\\0\';
}
int BitStr2ByteArr(char *bs,char *ba){
   int i,k,j,L;
   L = strlen(bs);
   char string[100];int sum=0;
   if(L%4==1)
   {
     strcpy(string,"000");
     strcat(string,bs);
     k=L/4+1;
   }
   else if(L%4==2)
   {
     strcpy(string,"00");
     strcat(string,bs);
     k=L/4+1;
   }
    else if(L%4==3)
   {
      strcpy(string,"0");;
      strcat(string,bs);
      k=L/4+1;
   }
   else
   {
       k=L/4;
       strcpy(string,bs);
   }
   for(i=0;i<k;i++)
   {
       for(j=0;j<4;j++)
       {
           sum=sum*2;
           sum=sum+(string[4*i+j]-\'0\');
       }
       Hex2Char(sum,&ba[i]);
       sum=0;
   }
   ba[i]=\'\\0\';
}

main.c

#include<stdio.h>
#include"utils.h"
int main(){
  char ba[100];
  char bs[100];
  printf("input ByteArr:\\n");
  scanf("%s",ba);
  ByteArr2BitStr(ba,bs);
  printf("bitstr:\\n");
  printf("%s\\n",bs);

  char baa[100];
  char bss[100];
  printf("input bitstr:\\n");
  scanf("%s",bss);
  BitStr2ByteArr(bss,baa);
  printf("ByteArr:\\n");
  printf("%s\\n",baa);
  return 0;
}

utils.h

#ifndef _UTIL_H_
#define _UTIL_H_

//char Hex2Char(int i);
//int Char2Hex(char c);

int Hex2Char(int fromi,char * toc);
int Char2Hex(char fromc,int * toi);

int Bitstr2ByteArr(char * bs,char * ba);
int ByteArr2Bitstr(char * ba,char * bs);

int Int2ByteArr(int i,char * ba);
int ByteArr2Int(char * ba,int * i);

#endif

 test.c

#include<stdio.h>
#include<string.h>
//十六进制字符串转二进制字符串
void Hex2Bin(char *source,char *dest,int len)
{
    int i=0;
    char Dict[17][5] =
    {
        "0000", "0001", "0010", "0011",
        "0100", "0101", "0110", "0111",
        "1000", "1001", "1010", "1011",
        "1100", "1101", "1110", "1111",
    };
    for(i=0;i<len;i++){
        //char temp[5]={0};
        int n = 16;
        if (source[i] >= \'a\' && source[i] <= \'f\') n = source[i] - \'a\' + 10;
        if (source[i] >= \'A\' && source[i] <= \'F\') n = source[i] - \'A\' + 10;
        if (source[i] >= \'0\' && source[i] <= \'9\') n = source[i] - \'0\';
         //sprintf(temp,"%s", Dict[n]);
         //memcpy(&dest[i*4],temp,4);
         memcpy(&dest[i*4],Dict[n],4);
    }
    return;
}

int main()
{
    char Hexstring[64]="94a8\\0";
    char Binarystring[256]={0};
    Hex2Bin(Hexstring,Binarystring,strlen(Hexstring));
    printf("十六进制串长度：%d十六进制串：%s,\\n二进制串长度：%d,二进制串：",strlen(Hexstring),Hexstring,strlen(Binarystring));
    puts(Binarystring);
    return 0;
}