皮肤『千变万化』中的base64编码与解码

William2009-05-07 08:43设计8,421次浏览1条评论

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皮肤『千变万化』刚刚发布，就有朋友问我，为什么看不到皮肤文件夹的名字，其实呢，这个用了简单的base64编码，将文件夹名变成了类似乱码的字符，主要目的就是为了防止盗皮肤吧，当然了对于略微懂一些的朋友来说，这个加不加都没有关系，一看就看出来了。


<html>
   <head>
      <title>base64 编码与解码</title>
   </head>
   <script type="text/javascript">
   var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
   function encode64(input) {
      input = escape(input);
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;
      do {
         chr1 = input.charCodeAt(i++);
         chr2 = input.charCodeAt(i++);
         chr3 = input.charCodeAt(i++);
         enc1 = chr1 >> 2;
         enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
         enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
         enc4 = chr3 & 63;
         if (isNaN(chr2)) {
            enc3 = enc4 = 64;
         } else if (isNaN(chr3)) {
            enc4 = 64;
         }
         output = output +
            keyStr.charAt(enc1) +
            keyStr.charAt(enc2) +
            keyStr.charAt(enc3) +
            keyStr.charAt(enc4);
         chr1 = chr2 = chr3 = "";
         enc1 = enc2 = enc3 = enc4 = "";
      } while (i < input.length);
      return output;
   }
   function decode64(input) {
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;
      var base64test = /[^A-Za-z0-9\+\/\=]/g;
      if (base64test.exec(input)) {
         alert("There were invalid base64 characters in the input text.\n" +
               "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
               "Expect errors in decoding.");
      }
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
      do {
         enc1 = keyStr.indexOf(input.charAt(i++));
         enc2 = keyStr.indexOf(input.charAt(i++));
         enc3 = keyStr.indexOf(input.charAt(i++));
         enc4 = keyStr.indexOf(input.charAt(i++));
         chr1 = (enc1 << 2) | (enc2 >> 4);
         chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
         chr3 = ((enc3 & 3) << 6) | enc4;
         output = output + String.fromCharCode(chr1);
         if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
         }
         if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
         }
         chr1 = chr2 = chr3 = "";
         enc1 = enc2 = enc3 = enc4 = "";
      } while (i < input.length);
      return unescape(output);
   }
   </script>
   <body>
      <form name="base64Form">
         输入你想编码的字符，或者想解码的字符，然后点击对应的按钮<br>
         <textarea name="theText" cols="40" rows="6"></textarea><br>
         <input type="button" name="encode" value="base64 编码"
            onClick="document.base64Form.theText.value=encode64(document.base64Form.theText.value);">
         <input type="button" name="decode" value="base64 解码"
            onClick="document.base64Form.theText.value=decode64(document.base64Form.theText.value);">
      </form>
   </body>
</html>

在皮肤『千变万化』，皮肤文件夹vv1经编码后得到dnYx；编码后的dnY0解码得到vv4。如果想换皮肤文件夹名称的可以再这里修改！

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