Twitterのユーザーアイコンにgifアニメを使えるようにするswf

/**
 * Copyright zahir ( http://wonderfl.net/user/zahir )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/cL9F
 */

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" width="465" height="465">
	<fx:Script>
		<![CDATA[
			/*
			 * Twitter のアイコンにアニメーションgifを適用できるようにする
			 * 只それだけ
			 */
			
			private var fr:FileReference;
			private const type:Array = [ new FileFilter("load gif file","*.gif;*.GIF") ];
			private var ba:ByteArray;
			
			private var fileName:String = "";
			
			private function start():void{
				s_btn.enabled = false;
				fr = new FileReference();
				fr.addEventListener(Event.SELECT, onSelect );
				fr.browse( type );
			}
			private function onSelect( e:Event ):void{
				fr.removeEventListener( Event.SELECT, onSelect );
				fr.addEventListener(Event.COMPLETE, onComp );
				fr.load();
			}
			private function onComp( e:Event ):void{
				fr.removeEventListener( Event.COMPLETE, onComp);
				
				fileName = fr.name;
				execute( fr.data );
			}
			private function execute( bytes:ByteArray ):void{
				ba = new ByteArray();
				bytes.readBytes( ba, 0, bytes.length - 1 );
				ba.position = ba.length;
				ba.writeByte(0x3C);
				ba.writeByte(0x2C);
				
				s_btn.enabled = true;
			}
			private function save():void{
				fr = new FileReference();
				fr.addEventListener(Event.SELECT, saveSelect);
				fr.save(ba,fileName);
			}
			private function saveSelect(e:Event):void{
				fr.removeEventListener(Event.SELECT, saveSelect);
			}
		]]>
	</fx:Script>
	<s:HGroup horizontalCenter="0" verticalCenter="0">
		<s:Button label="Load gif file" click="start();"/>
		<s:Button id="s_btn" enabled="false" click="save();" label="Save gif file"/>
	</s:HGroup>
	<s:Label text="Twitterにgifファイルをupできるようにします" horizontalCenter="0" verticalCenter="-50"/>
	
</s:Application>