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// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

// schiller: Removed string concatenation in favour of Array.join() optimization,
//           also precalculate the size of the array needed.

// Function: method_draw_encode64
// Converts a string to base64
var method_draw_encode64 = function(input) {
  // base64 strings are 4/3 larger than the original string
  input = method_draw_convertToXMLReferences(input);
  if(window.btoa) return window.btoa(input); // Use native if available
  var output = new Array( Math.floor( (input.length + 2) / 3 ) * 4 );
  var chr1, chr2, chr3;
  var enc1, enc2, enc3, enc4;
  var i = 0, p = 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[p++] = KEYSTR.charAt(enc1);
	  output[p++] = KEYSTR.charAt(enc2);
	  output[p++] = KEYSTR.charAt(enc3);
	  output[p++] = KEYSTR.charAt(enc4);
  } while (i < input.length);

  return output.join('');
};

// Function: method_draw_decode64
// Converts a string from base64
var method_draw_decode64 = function(input) {
  if(window.atob) return window.atob(input);
  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 =
   input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

   do {
	  enc1 = KEYSTR.indexOf(input.charAt(i++));
	  enc2 = KEYSTR.indexOf(input.charAt(i++));
	  enc3 = KEYSTR.indexOf(input.charAt(i++));
	  enc4 = 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 = output + String.fromCharCode(chr2);
	  }
	  if (enc4 != 64) {
	     output = output + String.fromCharCode(chr3);
	  }

	  chr1 = chr2 = chr3 = "";
	  enc1 = enc2 = enc3 = enc4 = "";

   } while (i < input.length);
   return unescape(output);
};

// Function: method_draw_convertToXMLReferences
// Converts a string to use XML references
var method_draw_convertToXMLReferences = function(input) {
	var output = '';
	for (var n = 0; n < input.length; n++){
		var c = input.charCodeAt(n);
		if (c < 128) {
			output += input[n];
		} else if(c > 127) {
			output += ("&#" + c + ";");
		}
	}
	return output;
};
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