//=================================================================================================
var base64 = 
{
	//--------------------------------------------------------------------------
	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
	//--------------------------------------------------------------------------
	// public method for encoding
	encode : function( input )
	{
		var
			output = "", 
			i      = 0, 
			chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		
		input = base64._utf8_encode( input );
		
		while ( i < input.length )
		{
			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 = output +
			this._keyStr.charAt( enc1 ) + this._keyStr.charAt( enc2 ) +
			this._keyStr.charAt( enc3 ) + this._keyStr.charAt( enc4 );
		}
		
		return output;
	},
	//--------------------------------------------------------------------------
	// public method for decoding
	decode : function( input ) 
	{
		var
			output = "", 
			i      = 0, 
			chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		
		input = input.replace( /[^A-Za-z0-9\+\/\=]/g, "");
		
		while (i < input.length)
		{
			enc1 = this._keyStr.indexOf( input.charAt( i++ ) );
			enc2 = this._keyStr.indexOf( input.charAt( i++ ) );
			enc3 = this._keyStr.indexOf( input.charAt( i++ ) );
			enc4 = this._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 );
		}
		
		output = base64._utf8_decode( output );
		
		return output;
	},
	//--------------------------------------------------------------------------
	// private method for UTF-8 encoding
	_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;
	},
	//--------------------------------------------------------------------------
	// private method for UTF-8 decoding
	_utf8_decode : function( utftext ) 
	{
		var 
			string = "", 
			i      = 0, 
			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;
	}
	//--------------------------------------------------------------------------
}
//=================================================================================================