十六进制元素数组与字符串相互转换（C语言）-蒲公英云

十六进制元素数组与字符串相互转换（C语言）

短命女 2023-06-27 03:52 92阅读 0赞

0x00 前言

文章中的文字可能存在语法错误以及标点错误，请谅解；

如果在文章中发现代码错误或其它问题请告知，感谢！

0x01 字符串化成十六进制数组

将十六进制的数组转化成同样值的字符串函数如下：

int StringToBuff(char *str,unsigned char *OutputBuff)
{ 
    char *p = NULL;
    char High = 0;
    char Low = 0;
    int i = 0;
    int Len = 0;
    int count = 0;
    p = str;
    Len = strlen(p);
    while(count < (Len/2))
    { 
        High = ((*p > '9') && ((*p <= 'F') || (*p <= 'f')))?*p - 48 - 7 : *p - 48;
        Low = (*(++ p) > '9' && ((*p <= 'F') || (*p <= 'f')))? *p - 48 - 7 : *p - 48;
        OutputBuff[count] = ((High & 0x0f) << 4 | (Low & 0x0f));
        p ++;
        count ++;
    }
    //判断字符串长度是否为奇数
    if(0 != Len%2)
    { 
        OutputBuff[count++] = ((*p >'9')&&(*p<='F')||(*p<='f'))?*p-48-7:*p-48;
    }
    return Len/2 + Len%2;
}

0x02 十六进制数组转化成字符串

int ArrayToStr(unsigned char *Buff, unsigned int BuffLen, char *OutputStr)
{ 
    int i = 0;
    char TempBuff[128] = { 0};
    char strBuff[256] = { 0};
    for(i = 0; i<BuffLen;i++)
    { 
        sprintf(TempBuff,"%02x",Buff[i]);//以十六进制格式输出到TempBuff，宽度为2
        strncat(strBuff,TempBuff,BuffLen*2);//将TempBuff追加到strBuff结尾
    }
    strncpy(OutputStr, strBuff, BuffLen*2); //将strBuff复制到OutputStr
    return BuffLen*2;
}

0x03 举例

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
unsigned char ArrayHex[16] = { 0x1a, 0x2b, 0x3c, 0x4d, 0x5e, 0x6f, 0x7b, 0x8d, 0x9e, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
char *strCom = "1a2b3c4d5e6f7a8b9c1011121314";
int main(int argc, const char *argv)
{ 
    int i= 0;
    int outlen = 0;
    char str[33] = { 0};
    unsigned char out[33] = { 0};
    ArrayToStr(ArrayHex, 16, str);   
    printf("after ArrayToStr :%s\n",str);
    outlen = StringToBuff(strCom, out);
    printf("after StringToBuff\n");
    for(i= 0; i< outlen; i++)
    { 
        printf("%02X ", out[i]);
    } 
    printf("\n");
    return 0;
}