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base64

base64 encode decode

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/32483/213081/base64.js 

  1. /**
  2.  * 来自http: //www1.tc711.com/tool/js/Base64.js
  3.  */
  4. var base64 = {
  5.   encodeChars:'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
  6.   decodeChars: [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1],
  7.   encode: function(str) {
  8.     var out, i, len;
  9.     var c1, c2, c3;
  10.     len = str.length;
  11.     i = 0;
  12.     out = '';
  13.     while (i < len) {
  14.       c1 = str.charCodeAt(i++) & 255;
  15.       if (i == len) {
  16.         out += this.encodeChars.charAt(c1 >> 2);
  17.         out += this.encodeChars.charAt((c1 & 3) << 4);
  18.         out += '==';
  19.         break;
  20.       }
  21.       c2 = str.charCodeAt(i++);
  22.       if (i == len) {
  23.         out += this.encodeChars.charAt(c1 >> 2);
  24.         out += this.encodeChars.charAt(((c1 & 3) << 4) | ((c2 & 240) >> 4));
  25.         out += this.encodeChars.charAt((c2 & 15) << 2);
  26.         out += '=';
  27.         break;
  28.       }
  29.       c3 = str.charCodeAt(i++);
  30.       out += this.encodeChars.charAt(c1 >> 2);
  31.       out += this.encodeChars.charAt(((c1 & 3) << 4) | ((c2 & 240) >> 4));
  32.       out += this.encodeChars.charAt(((c2 & 15) << 2) | ((c3 & 192) >> 6));
  33.       out += this.encodeChars.charAt(c3 & 63);
  34.     }
  35.     return out;
  36.   },
  37.   decode: function(str) {
  38.     var c1, c2, c3, c4;
  39.     var i, len, out;
  40.     len = str.length;
  41.     i = 0;
  42.     out = '';
  43.     while (i < len) {
  44.       do {
  45.         c1 = this.decodeChars[str.charCodeAt(i++) & 255];
  46.       }
  47.       while (i < len && c1 == -1);
  48.       if (c1 == -1)
  49.         break;
  50.       do {
  51.         c2 = this.decodeChars[str.charCodeAt(i++) & 255];
  52.       }
  53.       while (i < len && c2 == -1);
  54.       if (c2 == -1)
  55.         break;
  56.       out += String.fromCharCode((c1 << 2) | ((c2 & 48) >> 4));
  57.       do {
  58.         c3 = str.charCodeAt(i++) & 255;
  59.         if (c3 == 61)
  60.           return out;
  61.         c3 = this.decodeChars[c3];
  62.       }
  63.       while (i < len && c3 == -1);
  64.       if (c3 == -1)
  65.         break;
  66.       out += String.fromCharCode(((c2 & 15) << 4) | ((c3 & 60) >> 2));
  67.       do {
  68.         c4 = str.charCodeAt(i++) & 255;
  69.         if (c4 == 61)
  70.           return out;
  71.         c4 = this.decodeChars[c4];
  72.       }
  73.       while (i < len && c4 == -1);
  74.       if (c4 == -1)
  75.         break;
  76.       out += String.fromCharCode(((c3 & 3) << 6) | c4);
  77.     }
  78.     return out;
  79.   },
  80.   utf8to16: function(str) {
  81.     var out, i, len, c;
  82.     var char2, char3;
  83.     out = '';
  84.     len = str.length;
  85.     i = 0;
  86.     while (i < len) {
  87.       c = str.charCodeAt(i++);
  88.       switch (c >> 4) {
  89.         case 0:
  90.         case 1:
  91.         case 2:
  92.         case 3:
  93.         case 4:
  94.         case 5:
  95.         case 6:
  96.         case 7:
  97.           out += str.charAt(i - 1);
  98.           break;
  99.         case 12:
  100.         case 13:
  101.           char2 = str.charCodeAt(i++);
  102.           out += String.fromCharCode(((c & 31) << 6) | (char2 & 63));
  103.           break;
  104.         case 14:
  105.           char2 = str.charCodeAt(i++);
  106.           char3 = str.charCodeAt(i++);
  107.           out += String.fromCharCode(((c & 15) << 12) | ((char2 & 63) << 6) | ((char3 & 63) << 0));
  108.           break;
  109.       }
  110.     }
  111.     return out;
  112.   },
  113.   utf16to8: function(str) {
  114.     var out, i, len, c;
  115.     out = "";
  116.     len = str.length;
  117.     for (i = 0; i < len; i++) {
  118.       c = str.charCodeAt(i);
  119.       if ((c >= 0x0001) && (c <= 0x007F)) {
  120.         out += str.charAt(i);
  121.       } else if (c > 0x07FF) {
  122.         out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
  123.         out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
  124.         out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
  125.       } else {
  126.         out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
  127.         out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
  128.       }
  129.     }
  130.     return out;
  131.   }
  132. }