FileStream bytesAvailable 1GB limit?

Question

I'm working with reading very large files, around 5 GB, in an AIR application.
When I open a ~5GB file into a FileStream, bytesAvailable has a value of 1073741824 (0x40000000, exactly 1 GB). I therefore can not read past a 1GB boundary with any combination of .readBytes() and/or setting .position.
Is this an expected behavior? Is there any other way to read the full contents of files > 1GB size?
Below is a sample application. When I select my large file the trace is:
5368709120 1073741824
<?xml version="1.0" encoding="utf-8"?><mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="onCreationComplete(event);"> <mx:Script>  <![CDATA[   private var _docsDir:File = File.documentsDirectory;   private var _stream:FileStream;   private function onCreationComplete(event:Event):void {    _docsDir.addEventListener(FileListEvent.SELECT_MULTIPLE, onSelectFile);    _docsDir.browseForOpenMultiple("Select File");   }
   private function onSelectFile(event:FileListEvent):void {    _stream = new FileStream();    _stream.open(event.files[0], FileMode.READ);    trace(event.files[0].size, _stream.bytesAvailable);   }  ]]> </mx:Script></mx:WindowedApplication>

Answer 1

Hi Chris,
Wanted to know if there are any similar issues for AIR apps on iOS. (Flex 4.6, AIR 3.6, iOS 6.0.1)
I am trying to load a file remotely, it gets loaded successfully. After this, I am trying to read the loaded data into a bytearray using URLStream. Here it fails when we user readBytes. Sometimes it will be successful in reading the files, but again later on when I am trying to write this bytearray data to a local file, it fails again when I use filstream.writeBytes().
It works fine without any problems when I test it on laptop as AIR app, but fails on the device
private var fileData:ByteArray = new ByteArray();
public function getFileRemote(pathRemote:String, fileNameR:String):void 
urlStream = new URLStream();
var urlReq:URLRequest = new URLRequest(pathRemote); 
urlStream.addEventListener(Event.COMPLETE, loaded);
urlStream.addEventListener(ProgressEvent.PROGRESS, doEvent);
urlStream.load (urlReq); 
fileName = fileNameR;
private function loaded(event:Event):void 
try{
progress = progress + 'before urlStream.readBytes\n';
saveLog();
urlStream.addEventListener(ProgressEvent.PROGRESS, doEvent);
urlStream.readBytes (fileData, 0, urlStream.bytesAvailable); // for file sizes greater than 50MB (upto 800-900MB max in our case), readBytes fails and gets into catch block
progress = progress + 'after urlStream.readBytes success\n';
saveLog();
resolveFile(fileName);
}catch(e:Error)
progress = progress + 'catch urlStream.readBytes\n';
saveLog();
private function resolveFile(pathLocal:String):void 
fileLocal = File.applicationStorageDirectory.resolvePath(pathLocal);
//if(!fileLocal.exists)
//fileLocal = File.desktopDirectory.resolvePath(pathLocal); 
var fileStream:FileStream = new FileStream(); 
fileStream.addEventListener(Event.CLOSE, fileClosed);
fileStream.addEventListener(OutputProgressEvent.OUTPUT_PROGRESS, onFileWriteProgress);
fileStream.addEventListener(IOErrorEvent.IO_ERROR, onFileWriteIO);
try{
//fileStream.openAsync(fileLocal, FileMode.WRITE);
fileStream.open(fileLocal, FileMode.WRITE);
progress = progress + 'zip fileStream.open success\n';
saveLog();
}catch(e:Error)
progress = progress + 'zip fileStream.open error\n';
saveLog();
try{
progress = progress + 'before fileStream.writeBytes \n';
saveLog();
fileStream.writeBytes(fileData, 0, fileData.length);   //writeBytes also fails and gets inside catch block someimtes or most of the times, it crashes on the device
//fileStream.writeObject(fileData);
progress = progress + 'after fileStream.writeBytes success\n';
saveLog();
}catch(e:Error)
progress = progress + 'zip fileStream.writeBytes error\n';
saveLog();
fileStream.close();
sqlite.openDb(fileLocal);
Can you kindly help? And point out if there any file readBytes\writeBytes limitations on iOS? Or if there are any alternatives for me apart from this code?
Appreciate your help.
-Deepak