text: /*jslint adsafe: false, bitwise: true, browser: true, cap: false, css: false,
    debug: false, devel: true, eqeqeq: true, es5: false, evil: false,
    forin: false, fragment: false, immed: true, laxbreak: false, newcap: true,
    nomen: false, on: false, onevar: true, passfail: false, plusplus: true,
    regexp: false, rhino: true, safe: false, strict: false, sub: false,
    undef: true, white: false, widget: false, windows: false */
  /*global jQuery: false, window: false */
  "use strict";
  
  /*
   * Original code (c) 2010 Nick Galbreath
   * http://code.google.com/p/stringencoders/source/browse/#svn/trunk/javascript
   *
   * jQuery port (c) 2010 Carlo Zottmann
   * http://github.com/carlo/jquery-base64
   *
   * Permission is hereby granted, free of charge, to any person
   * obtaining a copy of this software and associated documentation
   * files (the "Software"), to deal in the Software without
   * restriction, including without limitation the rights to use,
   * copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following
   * conditions:
   *
   * The above copyright notice and this permission notice shall be
   * included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
   * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
   * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
  */
  
  /* base64 encode/decode compatible with window.btoa/atob
   *
   * window.atob/btoa is a Firefox extension to convert binary data (the "b")
   * to base64 (ascii, the "a").
   *
   * It is also found in Safari and Chrome.  It is not available in IE.
   *
   * if (!window.btoa) window.btoa = $.base64.encode
   * if (!window.atob) window.atob = $.base64.decode
   *
   * The original spec's for atob/btoa are a bit lacking
   * https://developer.mozilla.org/en/DOM/window.atob
   * https://developer.mozilla.org/en/DOM/window.btoa
   *
   * window.btoa and $.base64.encode takes a string where charCodeAt is [0,255]
   * If any character is not [0,255], then an exception is thrown.
   *
   * window.atob and $.base64.decode take a base64-encoded string
   * If the input length is not a multiple of 4, or contains invalid characters
   *   then an exception is thrown.
   */
  
  var Base64 = ( function( ) {
  
    var _PADCHAR = "=",
      _ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
      _VERSION = "1.0";
  
  
    function _getbyte64( s, i ) {
      // This is oddly fast, except on Chrome/V8.
      // Minimal or no improvement in performance by using a
      // object with properties mapping chars to value (eg. 'A': 0)
  
      var idx = _ALPHA.indexOf( s.charAt( i ) );
  
      if ( idx === -1 ) {
        throw "Cannot decode base64";
      }
  
      return idx;
    }
  
  
    function _decode( s ) {
      var pads = 0,
        i,
        b10,
        imax = s.length,
        x = [];
  
      s = String( s );
  
      if ( imax === 0 ) {
        return s;
      }
  
      if ( imax % 4 !== 0 ) {
        throw "Cannot decode base64";
      }
  
      if ( s.charAt( imax - 1 ) === _PADCHAR ) {
        pads = 1;
  
        if ( s.charAt( imax - 2 ) === _PADCHAR ) {
  	pads = 2;
        }
  
        // either way, we want to ignore this last block
        imax -= 4;
      }
  
      for ( i = 0; i < imax; i += 4 ) {
        b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 ) | _getbyte64( s, i + 3 );
        x.push( String.fromCharCode( b10 >> 16, ( b10 >> 8 ) & 0xff, b10 & 0xff ) );
      }
  
      switch ( pads ) {
        case 1:
  	b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 );
  	x.push( String.fromCharCode( b10 >> 16, ( b10 >> 8 ) & 0xff ) );
  	break;
  
        case 2:
  	b10 = ( _getbyte64( s, i ) << 18) | ( _getbyte64( s, i + 1 ) << 12 );
  	x.push( String.fromCharCode( b10 >> 16 ) );
  	break;
      }
  
      return x.join( "" );
    }
  
  
    function _getbyte( s, i ) {
      var x = s.charCodeAt( i );
  
      if ( x > 255 ) {
        throw "INVALID_CHARACTER_ERR: DOM Exception 5";
      }
  
      return x;
    }
  
  
    function _encode( s ) {
      if ( arguments.length !== 1 ) {
        throw "SyntaxError: exactly one argument required";
      }
  
      s = String( s );
  
      var i,
        b10,
        x = [],
        imax = s.length - s.length % 3;
  
      if ( s.length === 0 ) {
        return s;
      }
  
      for ( i = 0; i < imax; i += 3 ) {
        b10 = ( _getbyte( s, i ) << 16 ) | ( _getbyte( s, i + 1 ) << 8 ) | _getbyte( s, i + 2 );
        x.push( _ALPHA.charAt( b10 >> 18 ) );
        x.push( _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) );
        x.push( _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) );
        x.push( _ALPHA.charAt( b10 & 0x3f ) );
      }
  
      switch ( s.length - imax ) {
        case 1:
  	b10 = _getbyte( s, i ) << 16;
  	x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _PADCHAR + _PADCHAR );
  	break;
  
        case 2:
  	b10 = ( _getbyte( s, i ) << 16 ) | ( _getbyte( s, i + 1 ) << 8 );
  	x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) + _PADCHAR );
  	break;
      }
  
      return x.join( "" );
    }
  
  
    return {
      decode: _decode,
      encode: _encode,
      VERSION: _VERSION
    };
  
  }( ) );
  
  export default Base64;
  