pen/assets/js/plugins/base64.js

/**
 * Base64.js
 * https://github.com/davidchambers/Base64.js
 * Apache License 2.0
 */
;(function () {

  var object =
    typeof exports != 'undefined' ? exports :
    typeof self != 'undefined' ? self : /* #8: web workers. */
    $.global; /* #31: ExtendScript. */

  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

  function InvalidCharacterError(message) {
    this.message = message;
  }
  InvalidCharacterError.prototype = new Error;
  InvalidCharacterError.prototype.name = 'InvalidCharacterError';

  /**
	 * Encoder
   * [https://gist.github.com/999166] by [https://github.com/nignag]
	 */
  object.btoa || (
  object.btoa = function (input) {
    var str = String(input);
    for (
      /* initialize result and counter. */
      var block, charCode, idx = 0, map = chars, output = '';
      /**
			 * if the next str index does not exist:
       * change the mapping table to "="
       * check if d has no fractional digits.
			 */
      str.charAt(idx | 0) || (map = '=', idx % 1);
      /* "8 - idx % 1 * 8" generates the sequence 2, 4, 6, 8. */
      output += map.charAt(63 & block >> 8 - idx % 1 * 8)
    ) {
      charCode = str.charCodeAt(idx += 3/4);
      if (charCode > 0xFF) {
        throw new InvalidCharacterError("'btoa' failed: The string to be encoded contains characters outside of the Latin1 range.");
      }
      block = block << 8 | charCode;
    }
    return output;
  });

  /**
	 * Decoder
   * [https://gist.github.com/1020396] by [https://github.com/atk]
	 */
  object.atob || (
  object.atob = function (input) {
    var str = String(input).replace(/[=]+$/, ''); /* #31: ExtendScript bad parse of /= */
    if (str.length % 4 == 1) {
      throw new InvalidCharacterError("'atob' failed: The string to be decoded is not correctly encoded.");
    }
    for (
      /* Initialize result and counters. */
      var bc = 0, bs, buffer, idx = 0, output = '';
      /* Get next character. */
      buffer = str.charAt(idx++);
      /* Character found in table? initialize bit storage and add its ascii value; */
      ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
        /**
				 * and if not first of each 4 characters,
         * convert the first 8 bits to one ascii character.
				 */
        bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
    ) {
      /* try to find character in table (0-63, not found => -1) */
      buffer = chars.indexOf(buffer);
    }
    return output;
  });

}());