C语言实现UrlEncode编码/UrlDecode解码-白红宇

C语言实现UrlEncode编码/UrlDecode解码

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发布时间：2019-06-06

本文共 2152 字，大约阅读时间需要 7 分钟。

#include 
     
      #include 
      
       #define BURSIZE 2048int hex2dec(char c){    if ('0' <= c && c <= '9')     {        return c - '0';    }     else if ('a' <= c && c <= 'f')    {        return c - 'a' + 10;    }     else if ('A' <= c && c <= 'F')    {        return c - 'A' + 10;    }     else     {        return -1;    }}char dec2hex(short int c){    if (0 <= c && c <= 9)     {        return c + '0';    }     else if (10 <= c && c <= 15)     {        return c + 'A' - 10;    }     else     {        return -1;    }}//编码一个url  void urlencode(char url[]){    int i = 0;    int len = strlen(url);    int res_len = 0;    char res[BURSIZE];    for (i = 0; i < len; ++i)     {        char c = url[i];        if (    ('0' <= c && c <= '9') ||                ('a' <= c && c <= 'z') ||                ('A' <= c && c <= 'Z') ||                 c == '/' || c == '.')         {            res[res_len++] = c;        }         else         {            int j = (short int)c;            if (j < 0)                j += 256;            int i1, i0;            i1 = j / 16;            i0 = j - i1 * 16;            res[res_len++] = '%';            res[res_len++] = dec2hex(i1);            res[res_len++] = dec2hex(i0);        }    }    res[res_len] = '\0';    strcpy(url, res);}// 解码urlvoid urldecode(char url[]){    int i = 0;    int len = strlen(url);    int res_len = 0;    char res[BURSIZE];    for (i = 0; i < len; ++i)     {        char c = url[i];        if (c != '%')         {            res[res_len++] = c;        }        else         {            char c1 = url[++i];            char c0 = url[++i];            int num = 0;            num = hex2dec(c1) * 16 + hex2dec(c0);            res[res_len++] = num;        }    }    res[res_len] = '\0';    strcpy(url, res);}int main(int argc, char *argv[]){    char url[100] = "二份";    urlencode(url); //编码后    printf("%s\n", url);    　　//char buf[100] = "%E4%BA%8C%E4%BB%BD";　　//当使用utf-8编码时　　"二份"解码出来为此    char buf[100] = "%B6%FE%B7%DD";　　　　　　//当使用gb2312编码时   "二份"解码出来为此    urldecode(buf); //解码后    printf("%s\n", buf);    return 0;}

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