function $(e) { return document.getElementById(e); }
 
var expect = 0;
var interval = 100000;
 
function callback (bytestring) {
  $('logarea').innerHTML = 'Expect: '+expect+'<br/>';
  $('logarea').innerHTML = 'Got: '+bytestring.length+'<br/>';
  if(expect == bytestring.length) {
    expect += interval;
  }
  else {
    if(interval == 1) {
      $('logarea').innerHTML += '<b>Final Value:'+bytestring.length+'</b><br/>';
      return;
    }
    else {
      expect -= interval;
      interval = interval / 10;
      expect += interval;
    }
  }
 
  if(bytestring.length >= 10000000) { // ~10 Mb
    $('logarea').innerHTML += '<b>Reached ~10 Mb, I give up.</b><br/>';
    return;
  }
 
  setTimeout("$('eiEmbed').expect(expect)", 50);
}

import flash.external.ExternalInterface;
 
if(!ExternalInterface.available)
  trace('EI Not Available. What have you done?!');
 
var returnval:String = '';
var lastexpect:int = 0;
 
function expect (bytes:int):void {
  var toadd:int = bytes;
 
  if(bytes < lastexpect)
    returnval = '';
  else
    toadd = bytes - lastexpect;
 
  for(var i = 0; i < toadd; ++i) {
    returnval += "a";
  }
  lastexpect = bytes;
  ExternalInterface.call('callback', returnval);
}
ExternalInterface.addCallback('expect', expect);