数据转换整数字节数组

数据转换-整数字节数组

utils.h

#ifndef UTILS_H
#define UTILS_H
int Int2ByteArr(unsigned int i, unsigned char * ba);
int ByteArr2Int(unsigned char * ba,unsigned int * i);
#endif

test.c

#include<stdio.h>
#include"utils.h"
int main(){

   unsigned int i=20191315;
   unsigned char ba [100]; 
   Int2ByteArr(i, ba);
   printf("ba=%s\n",ba);

   unsigned char bb [] = "75DDFA16";
   unsigned int h;
   ByteArr2Int(bb, &h);
   printf("%d\n",h);
}

u.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！");
     }
}
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！");
        }
}
 

int Int2ByteArr(unsigned int i, unsigned char * ba)
{
   int j;
   int a;
   int sum=0;
   int k=i;
   for(j=0;;j++)
   {
     k=k/16;
     if(k!=0)
      sum++;
     else
       break;
   }
   for(j=sum;j>=0;j--){
     a = i%16;
     Hex2Char(a,&ba[j]);
     i=i/16;   

   }
   ba[sum+1]='\0';


}
int ByteArr2Int(unsigned char * ba,unsigned int * i)
{
   int len;
   int j;
   int n=0;
   *i=0;
   len = strlen(ba);
   for(j=0;j<len;j++)
   {
      Char2Hex(ba[j],&n);
      *i=(*i)*16+n;  
   }
}