hexString_utility

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#C语言 #hexString

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本文提供了一种方法，用于将十六进制数据转换为字符串形式，并能逆向操作返回到原始的十六进制格式。代码包括两个核心函数：Hex2String 和 String2Hex，分别实现了从十六进制到字符串及反向的转换。

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

int Hex2String(unsigned char *src,int srclen,char *des,int deslen) {
    unsigned char Hb;
    unsigned char Lb;

    if (deslen < srclen * 2) return 0;
    memset(des, 0, deslen);

    for (int i = 0; i < srclen;i++) {
        Hb = (src[i] & 0xF0) >> 4; // 高位
        if (Hb <= 9) Hb += 0x30; // 0~9
        else if (Hb >= 10 && Hb <= 15) Hb = Hb - 10 + 'A'; // 10~15
        else return 0;

        Lb = src[i] & 0x0F; // 低位
        if (Lb <= 9) Lb += 0x30;
        else if (Lb >= 10 && Lb <= 15) Lb = Lb - 10 + 'A';
        else return 0;

        des[i * 2] = Hb;
        des[i * 2 + 1] = Lb;
    }
    return 1;
}

int String2Hex(char *src, unsigned char *des) {
    unsigned char Hb, Lb;
    unsigned int len = strlen(src);
    for (int i = 0, j = 0; i < len; i++) {
        Hb = src[i];
        if (Hb >= 'A'&&Hb <= 'F') Hb = Hb - 'A' + 10;
        else if (Hb >= '0'&&Hb <= '9') Hb -= 0x30;
        else return 0;

        i++;
        Lb = src[i];
        if (Lb >= 'A'&&Lb <= 'F') Lb = Lb - 'A' + 10;
        else if (Lb >= '0'&&Lb <= '9') Lb -= 0x30;
        else return 0;

        des[j++] = (Hb << 4) | Lb;
    }
    return 1;
}

// %x & 0xF0
void main() {

    //char b = '1';
    //printf("\n b :%x", b);
    //printf("\n b&0xF0 :%x", (b&0xFF));

    unsigned char src[] = { 0x12,0x34,0x56,0x78,0x90,0xab,0xbc,0xcd,0xde,0xef };
    char des[21];
    Hex2String(src, 10,des, sizeof(des));
    printf("\nsrc :%s ", des);

    if (String2Hex(des, src)) printf("\nconvert Ok .");
    else printf("\nconvert failed .");
}