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字符串转换成数组

在做OTA时，从服务器下载下来的bin文件的md5信息是一串字符串，在做比较时先要把字符串转换成数组，这里记录下，避免重复写。
例如：
把 hexstr = “fc412acb03bd5f2d2439a5a3b58e01a7”;转换成
hexarray[strlen(hexstr)/2] = {0xfc,0x41,0x2a,0xcb,0x03,0xbd,0x5f,0x2d,0x24,0x39,0xa5,0xa3,0xb5,0x8e,0x01,0xa7};

//filename:hexstr.c
#include <stdio.h>  
#include <string.h>  
static int HexStrToHexArray(unsigned char* hexstr,unsigned char* hexarray,unsigned char len)
{ if(hexstr == NULL || hexarray == NULL || (len%2)){printf("param null or err\n");return -1;}int i,idx=0;for(i=0;i<len;i+=2){if(hexstr[i] >= '0' && hexstr[i] <= '9')  //0~9 48~57{hexarray[idx] = hexstr[i] - '0';}else if(hexstr[i] >= 'A' && hexstr[i] <= 'F')  //A~F 65~70{hexarray[idx] = hexstr[i] - 'A' + 10;}else if(hexstr[i] >= 'a' && hexstr[i] <= 'f') //a~f 97~102{hexarray[idx] = hexstr[i] - 'a' + 10;}else {printf("isn't hex");return -1;}if(hexstr[i+1] >= '0' && hexstr[i+1] <= '9')  //0~9 48~57{hexarray[idx] = (hexarray[idx]<<4) | (hexstr[i+1] - '0');}else if(hexstr[i+1] >= 'A' && hexstr[i+1] <= 'F')  //A~F 65~70{hexarray[idx] = (hexarray[idx]<<4) | (hexstr[i+1] - 'A' + 10);}else if(hexstr[i+1] >= 'a' && hexstr[i+1] <= 'f') //a~f 97~102{hexarray[idx] = (hexarray[idx]<<4) | (hexstr[i+1] - 'a' + 10);}else {printf("isn't hex");return -1;}idx++;}return 0;
}int main(void)  
{  unsigned char * hexstr = "fc412acb03bd5f2d2439a5a3b58e01a7";unsigned char hexarray[16] = {0};HexStrToHexArray(hexstr,hexarray,strlen(hexstr));printf("MD5:\n");for(int i=0;i<sizeof(hexarray);i++){printf("0x%02X ",hexarray[i]);}printf("\n");return 0;  
}

执行结果

其实也可以把MD5计算出来后转换成字符串再用strcmp比较

本文标签： 字符串转换成数组

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