Query regarding a pd content

Hi,

      How does helix handle the progressively downloading
content with 
unknown size or without "?filesize=" in URL ?

     Please provide some information on it.


Thanks
Anshuman

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Here's a general description of how the code
in filesystem/local/full works regarding
progressive download. Hopefully this is
what you are looking for.

The IHXFileObject uses another object (IHXDataFile)
to actually read the file. The IHXFileObject is
an asynchronous interface while IHXDataFile is
a synchronous interface.

 - When the IHXDataFile is opened, its size is checked.
 - As long as a read from the IHXDataFile never
   fails, then a progressively downloaded file operates
   exactly like a non-progressively-downloaded file.
 - If a read fails, then we ask the file format 
   plugin to see whether or not it can handle a failed
   read. In most cases, the file format says no, it
   can't handle a failed read. In that case, we set
   a callback for a certain number of milliseconds.
 - When the callback fires, we check the filesize again
   and try the read again. If the read succeeds, then
   we return it. If the read fails, then we set another
   callback.
 - Eventually, when the size doesn't change for a long
   enough period of time, then we assume the download
   has finished.

Eric

=============================================
Eric Hyche (ehychereal.com)
Technical Lead
RealNetworks, Inc.  

> -----Original Message-----
> From: filesystem-dev-bounceshelixcommunity.org 
> [mailto:filesystem-dev-bounceshelixcommunity.org] On
Behalf 
> Of Anshuman Singh
> Sent: Thursday, December 13, 2007 8:17 AM
> To: filesystem-devhelixcommunity.org
> Cc: helix-client-devhelixcommunity.org
> Subject: [Filesystem-dev] Query regarding a pd content

> 
> Hi,
> 
>       How does helix handle the progressively
downloading 
> content with 
> unknown size or without "?filesize=" in URL
?
> 
>      Please provide some information on it.
> 
> 
> Thanks
> Anshuman
> 
> _______________________________________________
> Filesystem-dev mailing list
> Filesystem-devhelixcommunity.org
> http://lists.helixcommunity.org/mailman/listinfo/
filesystem-dev
> 


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