var keyStr = "ABCDEFGHIJKLMNOP" +
                "QRSTUVWXYZabcdef" +
                "ghijklmnopqrstuv" +
                "wxyz0123456789+/" +
                "=";

   function encode64(inputstr) {
   		return escape(inputstr);
   }
   
   //Base64加密
   function encodeBase64(inputstr) {
    
   		if(inputstr=="")return "AA==";
      inputstr = escape(inputstr);
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;

      do {
         chr1 = inputstr.charCodeAt(i++);
         chr2 = inputstr.charCodeAt(i++);
         chr3 = inputstr.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 < inputstr.length);

      return output; 
   }

//判断正则表达式
function judgeBase64(sourceStr){
	try{
	if(sourceStr=="")return false;
	var baseLen=sourceStr.length;
 
	if(baseLen%4!=0)return false;//长度不是4的倍数
 
	var fequal=sourceStr.indexOf("=");
 
	if(fequal>=0&&fequal<baseLen-2)return false;//等号不在末两位
 
	var re =  /[^A-Za-z0-9\+\/\=]/;
	if(!re.exec(sourceStr)){
 
		return true;
	}
	return false;
}catch(ex){
	showSystemLog(ex,3);
}
}


   function decode64(inputstr) {
   		if(inputstr=="AA==")return "";
   		var resultstr=unescape(inputstr);
   		
   		/*if(judgeBase64(resultstr)){
   			 resultstr= decodeBase64(resultstr) ;
   				
   		}*/
   	
   		return resultstr;
   }
   function decodeBase64(inputstr) {
    
   		if(inputstr=="")return "";
   		if(inputstr=="AA==")return "";
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;

      

      // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
      var base64test =  /[^A-Za-z0-9\+\/\=]/g;
      if (base64test.exec(inputstr)) {
 
      }
      inputstr = inputstr.replace(/[^A-Za-z0-9\+\/\=]/g, "");

      do {
         enc1 = keyStr.indexOf(inputstr.charAt(i++));
         enc2 = keyStr.indexOf(inputstr.charAt(i++));
         enc3 = keyStr.indexOf(inputstr.charAt(i++));
         enc4 = keyStr.indexOf(inputstr.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 < inputstr.length);
			resultstr=unescape(output);
			if(resultstr=="AA==")return "";
      return unescape(output); 
   }
   function base64decode_2(sourcestr){
   		return sourcestr;
   	}
   function base64encode_2(sourcestr){
   		return sourcestr;
   	}