数据转换-位串字节数组

数据转换-位串字节数组

utils.h

#ifndef UTILS_H
#define UTILS_H

int BitStr2ByteArr(char *bs,char *ba,int lbs);
int ByteArr2BitStr(char *ba,char *bs,int lba);
#endif

utils.c

#include<stdio.h>
#include"utils.h"
#include<string.h>
int Hex2Char(int f,char *t)
{
    if(f>=0&&f<=9)
    {
        *t= f+'0';
    } 
    else if(f>=10&&f<=15)
    {
        *t = f+'A'-10;
    }
    else
    {
        printf("input error！");
     }
    return 0;
}
int Char2Hex(char f,int *t1)
{
    if(f>='0'&& f<='9')
    {
             *t1= f-'0';
    }
    else if(f>='A'&& f<='F')
    {
             *t1= f-'A'+10;
    
        }
        else 
        {
            printf("input error！");
        }
    return 0;
}

int ByteArr2BitStr(char *ba,char *bs,int lba)
{
    int i,j;
    int k;
    int a;
    for(j=0;j<lba;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*lba]='\0';
}

int BitStr2ByteArr(char *bs,char *ba,int lbs)
{
   
   char string[100];
   int k;
   int i;
   int j;
   int sum=0;
   if(lbs%4==1)
   {
    strcpy(string,"000");
    strcat(string,bs);
    k=lbs/4+1;

   }
   else if(lbs%4==2)
   {
     strcpy(string,"00");
     strcat(string,bs);
     k=lbs/4+1;
   }
    else if(lbs%4==3)
   { 
      strcpy(string,"0");;
      strcat(string,bs);
      k=lbs/4+1;
   }
   else
   {
       k=lbs/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';
}

test.c

#include<stdio.h>
#include"utils.h"
int main(){
  char bytes[100];
  char bitss[100];
  int len,len1;
  printf("Input(byte):");
  scanf("%s",bytes);
  printf("Input(len):");
  scanf("%d",&len);
  ByteArr2BitStr(bytes,bitss,len);
  printf("bit:\n");
  printf("%s\n",bitss);
  len1= strlen(bitss);
  printf("len=%d\n",len1);

  char bytes_1[100];
  char bitss_1[100];
  int len_1,len2;
  printf("Input(01):");
  scanf("%s",bitss_1);
  printf("Input(len):");
  scanf("%d",&len_1);
  BitStr2ByteArr(bitss_1,bytes_1,len_1);
  printf("byte:\n");
  printf("%s\n",bytes_1);
  len2= strlen(bytes_1);
  printf("len=%d\n",len2);
  return 0;
}