text: var $module=(function($B){
  
  var _b_ = $B.builtins,
      _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
  
  function make_alphabet(altchars){
      var alphabet = _keyStr
      if(altchars!==undefined && altchars!==_b_.None){
          // altchars is an instance of Python bytes
          var source = altchars.source
          alphabet = alphabet.substr(0,alphabet.length-3)+
              _b_.chr(source[0])+_b_.chr(source[1])+'='
      }
      return alphabet
  }
  
  var Base64 = {
      error: function() { return 'binascii_error' },
  
      encode: function(bytes, altchars) {
  
          var input = bytes.source
          var output = "";
          var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
          var i = 0;
  
          var alphabet = make_alphabet(altchars)
  
          while (i < input.length) {
  
              chr1 = input[i++];
              chr2 = input[i++];
              chr3 = input[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 + alphabet.charAt(enc1) + 
                  alphabet.charAt(enc2) + 
                  alphabet.charAt(enc3) + 
                  alphabet.charAt(enc4);
  
          }
          return _b_.bytes(output, 'utf-8', 'strict');
      },
  
  
      decode: function(bytes, altchars, validate) {
          var output = [];
          var chr1, chr2, chr3;
          var enc1, enc2, enc3, enc4;
          
          var alphabet = make_alphabet(altchars)
          
          var input = bytes.source
  
          // If validate is set, check that all characters in input
          // are in the alphabet
          var _input = ''
          var padding = 0;
          for(var i=0, len=input.length;i<len;i++){
              var car = String.fromCharCode(input[i])
              var char_num = alphabet.indexOf(car)
              if(char_num==-1){
                  if(validate){throw Base64.error("Non-base64 digit found: "+car)}
              } else if(char_num==64 && i < input.length-2) {
                  if(validate){throw Base64.error("Non-base64 digit found: "+car)}
              } else if(char_num==64 && i >= input.length-2) {
                  padding++;
                  _input +=car;
              } else {
                  _input +=car
              }
          }
          input = _input;
          if (_input.length == padding ) return _b_.bytes([]);
          if ( _input.length % 4 > 0) throw Base64.error("Incorrect padding");
  
          var i = 0;
          while (i < input.length) {
  
              enc1 = alphabet.indexOf(input.charAt(i++));
              enc2 = alphabet.indexOf(input.charAt(i++));
              enc3 = alphabet.indexOf(input.charAt(i++));
              enc4 = alphabet.indexOf(input.charAt(i++));
  
              chr1 = (enc1 << 2) | (enc2 >> 4);
              chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
              chr3 = ((enc3 & 3) << 6) | enc4;
  
              output.push(chr1);
  
              if (enc3 != 64) {
                  output.push(chr2);
              }
              if (enc4 != 64) {
                  output.push(chr3);
              }
  
          }
          // return Python bytes
          return _b_.bytes(output, 'utf-8', 'strict')
  
      },
  
      _utf8_encode: function(string) {
          string = string.replace(/\r\n/g, "\n");
          var utftext = "";
  
          for (var n = 0; n < string.length; n++) {
  
              var c = string.charCodeAt(n);
  
              if (c < 128) {
                  utftext += String.fromCharCode(c);
              }
              else if ((c > 127) && (c < 2048)) {
                  utftext += String.fromCharCode((c >> 6) | 192);
                  utftext += String.fromCharCode((c & 63) | 128);
              }
              else {
                  utftext += String.fromCharCode((c >> 12) | 224);
                  utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                  utftext += String.fromCharCode((c & 63) | 128);
              }
  
          }
  
          return utftext;
      },
  
      _utf8_decode: function(utftext) {
          var string = "";
          var i = 0;
          var c = c1 = c2 = 0;
  
          while (i < utftext.length) {
  
              c = utftext.charCodeAt(i);
  
              if (c < 128) {
                  string += String.fromCharCode(c);
                  i++;
              }
              else if ((c > 191) && (c < 224)) {
                  c2 = utftext.charCodeAt(i + 1);
                  string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                  i += 2;
              }
              else {
                  c2 = utftext.charCodeAt(i + 1);
                  c3 = utftext.charCodeAt(i + 2);
                  string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                  i += 3;
              }
  
          }
  
          return string;
      }
  
  }
  
  return {Base64:Base64}
  }
  
  )(__BRYTHON__)