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✏️ Editing: base-64.js

/*
 * [hi-base64]{@link https://github.com/emn178/hi-base64}
 *
 * @version 0.2.1
 * @author Chen, Yi-Cyuan [emn178@gmail.com]
 * @copyright Chen, Yi-Cyuan 2014-2017
 * @license MIT
 */
/*jslint bitwise: true */
/*Modified by Pagelayer*/
(function () {
  'use strict';

var decodeAsBytes = function (base64Str) {
    var v1, v2, v3, v4, bytes = [], index = 0, length = base64Str.length;
    if (base64Str.charAt(length - 2) === '=') {
      length -= 2;
    } else if (base64Str.charAt(length - 1) === '=') {
      length -= 1;
    }

// 4 char to 3 bytes
    for (var i = 0, count = length >> 2 << 2; i < count;) {
      v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      v4 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      bytes[index++] = (v1 << 2 | v2 >>> 4) & 255;
      bytes[index++] = (v2 << 4 | v3 >>> 2) & 255;
      bytes[index++] = (v3 << 6 | v4) & 255;
    }

// remain bytes
    var remain = length - count;
    if (remain === 2) {
      v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      bytes[index++] = (v1 << 2 | v2 >>> 4) & 255;
    } else if (remain === 3) {
      v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
      bytes[index++] = (v1 << 2 | v2 >>> 4) & 255;
      bytes[index++] = (v2 << 4 | v3 >>> 2) & 255;
    }
    return bytes;
  };

utf8Base64Encode = function (str) {
      var v1, v2, v3, base64Str = '', bytes = utf8ToBytes(str), length = bytes.length;
      for (var i = 0, count = parseInt(length / 3) * 3; i < count;) {
        v1 = bytes[i++];
        v2 = bytes[i++];
        v3 = bytes[i++];
        base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] +
          BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] +
          BASE64_ENCODE_CHAR[(v2 << 2 | v3 >>> 6) & 63] +
          BASE64_ENCODE_CHAR[v3 & 63];
      }
      
      // remain char
      var remain = length - count;
      if (remain === 1) {
        v1 = bytes[i];
        base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] +
          BASE64_ENCODE_CHAR[(v1 << 4) & 63] +
          '==';
      } else if (remain === 2) {
        v1 = bytes[i++];
        v2 = bytes[i];
        base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] +
          BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] +
          BASE64_ENCODE_CHAR[(v2 << 2) & 63] +
          '=';
      }
      return base64Str;
    };

atob = function (base64Str) {
      var v1, v2, v3, v4, str = '', length = base64Str.length;
      if (base64Str.charAt(length - 2) === '=') {
        length -= 2;
      } else if (base64Str.charAt(length - 1) === '=') {
        length -= 1;
      }

// 4 char to 3 bytes
      for (var i = 0, count = length >> 2 << 2; i < count;) {
        v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        v4 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        str += String.fromCharCode((v1 << 2 | v2 >>> 4) & 255) +
          String.fromCharCode((v2 << 4 | v3 >>> 2) & 255) +
          String.fromCharCode((v3 << 6 | v4) & 255);
      }

// remain bytes
      var remain = length - count;
      if (remain === 2) {
        v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        str += String.fromCharCode((v1 << 2 | v2 >>> 4) & 255);
      } else if (remain === 3) {
        v1 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        v2 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        v3 = BASE64_DECODE_CHAR[base64Str.charAt(i++)];
        str += String.fromCharCode((v1 << 2 | v2 >>> 4) & 255) +
               String.fromCharCode((v2 << 4 | v3 >>> 2) & 255);
      }
      return str;
    };

utf8Base64Decode = function (base64Str) {
      var str = '', bytes = decodeAsBytes(base64Str), length = bytes.length;
      var i = 0, followingChars = 0, b, c;
      while (i < length) {
        b = bytes[i++];
        if (b <= 0x7F) {
          str += String.fromCharCode(b);
          continue;
        } else if (b > 0xBF && b <= 0xDF) {
          c = b & 0x1F;
          followingChars = 1;
        } else if (b <= 0xEF) {
          c = b & 0x0F;
          followingChars = 2;
        } else if (b <= 0xF7) {
          c = b & 0x07;
          followingChars = 3;
        } else {
          throw 'not a UTF-8 string';
        }

for (var j = 0; j < followingChars; ++j) {
          b = bytes[i++];
          if (b < 0x80 || b > 0xBF) {
            throw 'not a UTF-8 string';
          }
          c <<= 6;
          c += b & 0x3F;
        }
        if (c >= 0xD800 && c <= 0xDFFF) {
          throw 'not a UTF-8 string';
        }
        if (c > 0x10FFFF) {
          throw 'not a UTF-8 string';
        }

if (c <= 0xFFFF) {
          str += String.fromCharCode(c);
        } else {
          c -= 0x10000;
          str += String.fromCharCode((c >> 10) + 0xD800);
          str += String.fromCharCode((c & 0x3FF) + 0xDC00);
        }
      }
      return str;
    };
  } else {
    utf8Base64Encode = function (str) {
      var result = '';
      for (var i = 0; i < str.length; i++) {
        var charcode = str.charCodeAt(i);
        if (charcode < 0x80) {
          result += String.fromCharCode(charcode);
        } else if (charcode < 0x800) {
          result += String.fromCharCode(0xc0 | (charcode >> 6)) +
            String.fromCharCode(0x80 | (charcode & 0x3f));
        } else if (charcode < 0xd800 || charcode >= 0xe000) {
          result += String.fromCharCode(0xe0 | (charcode >> 12)) +
            String.fromCharCode(0x80 | ((charcode >> 6) & 0x3f)) +
            String.fromCharCode(0x80 | (charcode & 0x3f));
        } else {
          charcode = 0x10000 + (((charcode & 0x3ff) << 10) | (str.charCodeAt(++i) & 0x3ff));
          result += String.fromCharCode(0xf0 | (charcode >> 18)) +
            String.fromCharCode(0x80 | ((charcode >> 12) & 0x3f)) +
            String.fromCharCode(0x80 | ((charcode >> 6) & 0x3f)) +
            String.fromCharCode(0x80 | (charcode & 0x3f));
        }
      }
      return btoa(result);
    };

utf8Base64Decode = function (base64Str) {
      var tmpStr = atob(base64Str.trim('=').replace(/-/g, '+').replace(/_/g, '/'));
      if (!/[^\x00-\x7F]/.test(tmpStr)) {
        return tmpStr;
      }
      var str = '', i = 0, length = tmpStr.length, followingChars = 0, b, c;
      while (i < length) {
        b = tmpStr.charCodeAt(i++);
        if (b <= 0x7F) {
          str += String.fromCharCode(b);
          continue;
        } else if (b > 0xBF && b <= 0xDF) {
          c = b & 0x1F;
          followingChars = 1;
        } else if (b <= 0xEF) {
          c = b & 0x0F;
          followingChars = 2;
        } else if (b <= 0xF7) {
          c = b & 0x07;
          followingChars = 3;
        } else {
          throw 'not a UTF-8 string';
        }

for (var j = 0; j < followingChars; ++j) {
          b = tmpStr.charCodeAt(i++);
          if (b < 0x80 || b > 0xBF) {
            throw 'not a UTF-8 string';
          }
          c <<= 6;
          c += b & 0x3F;
        }
        if (c >= 0xD800 && c <= 0xDFFF) {
          throw 'not a UTF-8 string'; 
        }
        if (c > 0x10FFFF) {
          throw 'not a UTF-8 string';
        }

if (c <= 0xFFFF) {
          str += String.fromCharCode(c);
        } else {
          c -= 0x10000;
          str += String.fromCharCode((c >> 10) + 0xD800);
          str += String.fromCharCode((c & 0x3FF) + 0xDC00);
        }
      }
      return str;
    };
  }
  
  var encode = function (str, asciiOnly) {
    var notString = typeof(str) != 'string';
    if (notString && str.constructor === root.ArrayBuffer) {
      str = new Uint8Array(str);
    }
    if (notString) {
      return encodeFromBytes(str);
    } else {
      if (!asciiOnly && /[^\x00-\x7F]/.test(str)) {
        return utf8Base64Encode(str);
      } else {
        return btoa(str);
      }
    }
  };

var decode = function (base64Str, asciiOnly) {
    return asciiOnly ? atob(base64Str) : utf8Base64Decode(base64Str);
  };

var exports = {
    encode: encode,
    decode: decode,
    atob: atob,
    btoa: btoa
  };
  decode.bytes = decodeAsBytes;
  decode.string = decode;

root.pagelayer_Base64 = exports;
})();

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