/*
 *  base64.js
 *
 *  Licensed under the BSD 3-Clause License.
 *    http://opensource.org/licenses/BSD-3-Clause
 *
 *  References:
 *    http://en.wikipedia.org/wiki/Base64
 */
; ( function( global, factory ) {
	typeof exports === "object" && typeof module !== "undefined"
		? module.exports = factory( global )
		: typeof define === "function" && define.amd
			? define( factory ) : factory( global );
}( (
	typeof self !== "undefined" ? self
		: typeof window !== "undefined" ? window
			: typeof global !== "undefined" ? global
				: this
), function( global ) {
	"use strict";
	// existing version for noConflict()
	global = global || {};
	var _Base64 = global.Base64;
	var version = "2.5.1";
	// if node.js and NOT React Native, we use Buffer
	var buffer;
	if( typeof module !== "undefined" && module.exports ) {
		try {
			buffer = eval( "require('buffer').Buffer" );
		} catch( err ) {
			buffer = undefined;
		}
	}
	// constants
	var b64chars
		= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	var b64tab = function( bin ) {
		var t = {};
		for( var i = 0, l = bin.length; i < l; i++ ) t[ bin.charAt( i ) ] = i;
		return t;
	}( b64chars );
	var fromCharCode = String.fromCharCode;
	// encoder stuff
	var cb_utob = function( c ) {
		if( c.length < 2 ) {
			var cc = c.charCodeAt( 0 );
			return cc < 0x80 ? c
				: cc < 0x800 ? ( fromCharCode( 0xc0 | ( cc >>> 6 ) )
					+ fromCharCode( 0x80 | ( cc & 0x3f ) ) )
					: ( fromCharCode( 0xe0 | ( ( cc >>> 12 ) & 0x0f ) )
						+ fromCharCode( 0x80 | ( ( cc >>> 6 ) & 0x3f ) )
						+ fromCharCode( 0x80 | ( cc & 0x3f ) ) );
		}
		else {
			var cc = 0x10000
				+ ( c.charCodeAt( 0 ) - 0xD800 ) * 0x400
				+ ( c.charCodeAt( 1 ) - 0xDC00 );
			return ( fromCharCode( 0xf0 | ( ( cc >>> 18 ) & 0x07 ) )
				+ fromCharCode( 0x80 | ( ( cc >>> 12 ) & 0x3f ) )
				+ fromCharCode( 0x80 | ( ( cc >>> 6 ) & 0x3f ) )
				+ fromCharCode( 0x80 | ( cc & 0x3f ) ) );
		}
	};
	var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
	var utob = function( u ) {
		return u.replace( re_utob, cb_utob );
	};
	var cb_encode = function( ccc ) {
		var padlen = [ 0, 2, 1 ][ ccc.length % 3 ],
			ord = ccc.charCodeAt( 0 ) << 16
				| ( ( ccc.length > 1 ? ccc.charCodeAt( 1 ) : 0 ) << 8 )
				| ( ( ccc.length > 2 ? ccc.charCodeAt( 2 ) : 0 ) ),
			chars = [
				b64chars.charAt( ord >>> 18 ),
				b64chars.charAt( ( ord >>> 12 ) & 63 ),
				padlen >= 2 ? "=" : b64chars.charAt( ( ord >>> 6 ) & 63 ),
				padlen >= 1 ? "=" : b64chars.charAt( ord & 63 )
			];
		return chars.join( "" );
	};
	var btoa = global.btoa ? function( b ) {
		return global.btoa( b );
	} : function( b ) {
		return b.replace( /[\s\S]{1,3}/g, cb_encode );
	};
	var _encode = buffer ?
		buffer.from && Uint8Array && buffer.from !== Uint8Array.from
			? function( u ) {
				return ( u.constructor === buffer.constructor ? u : buffer.from( u ) )
					.toString( "base64" );
			}
			: function( u ) {
				return ( u.constructor === buffer.constructor ? u : new buffer( u ) )
					.toString( "base64" );
			}
		: function( u ) {
			return btoa( utob( u ) );
		}
		;
	var encode = function( u, urisafe ) {
		return !urisafe
			? _encode( String( u ) )
			: _encode( String( u ) ).replace( /[+\/]/g, function( m0 ) {
				return m0 == "+" ? "-" : "_";
			} ).replace( /=/g, "" );
	};
	var encodeURI = function( u ) {
		return encode( u, true );
	};
	// decoder stuff
	var re_btou = new RegExp( [
		"[\xC0-\xDF][\x80-\xBF]",
		"[\xE0-\xEF][\x80-\xBF]{2}",
		"[\xF0-\xF7][\x80-\xBF]{3}"
	].join( "|" ), "g" );
	var cb_btou = function( cccc ) {
		switch( cccc.length ) {
			case 4:
				var cp = ( ( 0x07 & cccc.charCodeAt( 0 ) ) << 18 )
					| ( ( 0x3f & cccc.charCodeAt( 1 ) ) << 12 )
					| ( ( 0x3f & cccc.charCodeAt( 2 ) ) << 6 )
					| ( 0x3f & cccc.charCodeAt( 3 ) ),
					offset = cp - 0x10000;
				return ( fromCharCode( ( offset >>> 10 ) + 0xD800 )
					+ fromCharCode( ( offset & 0x3FF ) + 0xDC00 ) );
			case 3:
				return fromCharCode(
					( ( 0x0f & cccc.charCodeAt( 0 ) ) << 12 )
					| ( ( 0x3f & cccc.charCodeAt( 1 ) ) << 6 )
					| ( 0x3f & cccc.charCodeAt( 2 ) )
				);
			default:
				return fromCharCode(
					( ( 0x1f & cccc.charCodeAt( 0 ) ) << 6 )
					| ( 0x3f & cccc.charCodeAt( 1 ) )
				);
		}
	};
	var btou = function( b ) {
		return b.replace( re_btou, cb_btou );
	};
	var cb_decode = function( cccc ) {
		var len = cccc.length,
			padlen = len % 4,
			n = ( len > 0 ? b64tab[ cccc.charAt( 0 ) ] << 18 : 0 )
				| ( len > 1 ? b64tab[ cccc.charAt( 1 ) ] << 12 : 0 )
				| ( len > 2 ? b64tab[ cccc.charAt( 2 ) ] << 6 : 0 )
				| ( len > 3 ? b64tab[ cccc.charAt( 3 ) ] : 0 ),
			chars = [
				fromCharCode( n >>> 16 ),
				fromCharCode( ( n >>> 8 ) & 0xff ),
				fromCharCode( n & 0xff )
			];
		chars.length -= [ 0, 0, 2, 1 ][ padlen ];
		return chars.join( "" );
	};
	var _atob = global.atob ? function( a ) {
		return global.atob( a );
	} : function( a ) {
		return a.replace( /\S{1,4}/g, cb_decode );
	};
	var atob = function( a ) {
		return _atob( String( a ).replace( /[^A-Za-z0-9\+\/]/g, "" ) );
	};
	var _decode = buffer ?
		buffer.from && Uint8Array && buffer.from !== Uint8Array.from
			? function( a ) {
				return ( a.constructor === buffer.constructor
					? a : buffer.from( a, "base64" ) ).toString();
			}
			: function( a ) {
				return ( a.constructor === buffer.constructor
					? a : new buffer( a, "base64" ) ).toString();
			}
		: function( a ) {
			return btou( _atob( a ) );
		};
	var decode = function( a ) {
		return _decode(
			String( a ).replace( /[-_]/g, function( m0 ) {
				return m0 == "-" ? "+" : "/";
			} )
				.replace( /[^A-Za-z0-9\+\/]/g, "" )
		);
	};
	var noConflict = function() {
		var Base64 = global.Base64;
		global.Base64 = _Base64;
		return Base64;
	};
	// export Base64
	global.Base64 = {
		VERSION: version,
		atob: atob,
		btoa: btoa,
		fromBase64: decode,
		toBase64: encode,
		utob: utob,
		encode: encode,
		encodeURI: encodeURI,
		btou: btou,
		decode: decode,
		noConflict: noConflict,
		__buffer__: buffer
	};
	// if ES5 is available, make Base64.extendString() available
	if( typeof Object.defineProperty === "function" ) {
		var noEnum = function( v ) {
			return { value: v, enumerable: false, writable: true, configurable: true };
		};
		global.Base64.extendString = function() {
			Object.defineProperty(
				String.prototype, "fromBase64", noEnum( function() {
					return decode( this );
				} ) );
			Object.defineProperty(
				String.prototype, "toBase64", noEnum( function( urisafe ) {
					return encode( this, urisafe );
				} ) );
			Object.defineProperty(
				String.prototype, "toBase64URI", noEnum( function() {
					return encode( this, true );
				} ) );
		};
	}
	//
	// export Base64 to the namespace
	//
	if( global[ "Meteor" ] ) { // Meteor.js
		Base64 = global.Base64;
	}
	// module.exports and AMD are mutually exclusive.
	// module.exports has precedence.
	if( typeof module !== "undefined" && module.exports ) {
		module.exports.Base64 = global.Base64;
	}
	else if( typeof define === "function" && define.amd ) {
		// AMD. Register as an anonymous module.
		define( [], function() {
			return global.Base64;
		} );
	}
	// that's it!
	return { Base64: global.Base64 };
} ) );