/*--
 Copyright (c) 2013 哈尔滨亿时代数码科技开发有限公司（www.hrbesd.com）. All rights reserved.
  
  HRBESD PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
--*/
var base64={};
base64.keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
//将Ansi编码的字符串进行Base64编码
base64.encode64=function(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 + base64.keyStr.charAt(enc1) + base64.keyStr.charAt(enc2)
				+ base64.keyStr.charAt(enc3) + base64.keyStr.charAt(enc4);
		chr1 = chr2 = chr3 = "";
		enc1 = enc2 = enc3 = enc4 = "";
	} while (i < input.length);
	return output;
};
//将Base64编码字符串转换成Ansi编码的字符串
base64.decode64=function(input) {
	var output = "";
	var chr1, chr2, chr3 = "";
	var enc1, enc2, enc3, enc4 = "";
	var i = 0;

	if (input.length % 4 != 0) {
		return "";
	}
	var base64test = /[^A-Za-z0-9\+\/\=]/g;
	if (base64test.exec(input)) {
		return "";
	}
	do {
		enc1 = base64.keyStr.indexOf(input.charAt(i++));
		enc2 = base64.keyStr.indexOf(input.charAt(i++));
		enc3 = base64.keyStr.indexOf(input.charAt(i++));
		enc4 = base64.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 += String.fromCharCode(chr2);
		}
		if (enc4 != 64) {
			output += String.fromCharCode(chr3);
		}
		chr1 = chr2 = chr3 = "";
		enc1 = enc2 = enc3 = enc4 = "";
	} while (i < input.length);
	return output;
};

base64.utf16to8 = function(str) {
  var out, i, len, c;

  out = "";
  len = str.length;
  for(i = 0; i < len; i++) {
    c = str.charCodeAt(i);
    if ((c >= 0x0001) && (c <= 0x007F)) {
      out += str.charAt(i);
    } else if (c > 0x07FF) {
      out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
      out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
      out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
    } else {
      out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
      out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
    }
  }
  return out;
};

base64.utf8to16=function(str) {
  var out, i, len, c;
  var char2, char3;

  out = "";
  len = str.length;
  i = 0;
  while(i < len) {
    c = str.charCodeAt(i++);
    switch(c >> 4) {
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
        // 0xxxxxxx
        out += str.charAt(i-1);
        break;
      case 12: case 13:
        // 110x xxxx   10xx xxxx
        char2 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
        break;
      case 14:
        // 1110 xxxx  10xx xxxx  10xx xxxx
        char2 = str.charCodeAt(i++);
        char3 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x0F) << 12) |
        ((char2 & 0x3F) << 6) |
        ((char3 & 0x3F) << 0));
        break;
    }
  }
  return out;
};
base64.e64=function(arg){
	return base64.encode64(base64.utf16to8(arg));
};
base64.d64=function(arg){
	return utf8to16(decode64(arg));
};