Downloading and saving a zip file is giving out of memory error

Hi,

I am downloading a 408.9 MB zip file through URLStream class. Below is my code.

protected function window1_creationCompleteHandler(event:FlexEvent):void

  {

  var urlStream:URLStream = new URLStream();

  var urlReq:URLRequest = new URLRequest(downloadUrl);

  urlStream.addEventListener(ProgressEvent.PROGRESS, handleProgress);

  urlStream.addEventListener(Event.COMPLETE, handleDownloadComplete);

  urlStream.addEventListener(IOErrorEvent.IO_ERROR, handleIOError);

  urlStream.load(urlReq);

  }

  private function handleProgress(event:ProgressEvent):void

  {

  progressBar.setProgress(event.bytesLoaded, event.bytesTotal);

  progressBar.label = "Downloading [" + Math.round(event.bytesLoaded / event.bytesTotal * 100).toString() + "%]";

  }

  private var totalFile:uint;

  private var currFile:uint;

  private var fileList:Array;

  private var albummStorageFile:File;

  private var albumZipFile:File;

  private function handleDownloadComplete(event:Event):void

  {

  var stream:URLStream = event.currentTarget as URLStream;

  var data:ByteArray = new ByteArray();

  stream.readBytes(data,0,stream.bytesAvailable);

  albumZipFile = File.applicationStorageDirectory.resolvePath("seldex_album.zip");

  var fileStream:FileStream = new FileStream();

  fileStream.open(albumZipFile, FileMode.WRITE);

  fileStream.writeBytes(data,0,data.length);

  fileStream.close();

  }

This line is giving error: Error #1000: The system is out of memory.

  stream.readBytes(data,0,stream.bytesAvailable);

stream.bytesAvailable valus is 408975369 at runtime.

I don't know what's causing the error.

Please help.

Thanks in advance.