Re: [hybi] Masking only Payload/Extension Data

[John Tamplin <[e-mail]>]

On Thu, Mar 10, 2011 at 2:08 PM, David Endicott <[e-mail]> wrote:

> It would seem to me that it must go after the length field, or else
> how does the server know how much of the following stream to unmask.
> It would need to unmask enough of the header to determine the entire
> frame size and then continue.  That seems an unnecessary burden and
> complicates server reception processing.
>

I'm not sure I understand your objection.  If you are writing a blocking
implementation, in the unmasked case you are going to read 2 bytes, and then
look at the second byte to decide how many more bytes are in the header.
 That lets you determine the length of the frame and read the rest of it.
 In the masked case, (as implemented in -06) you will read 6 bytes, then
start applying the mask to the bytes read as you process them.  In the
non-blocking case, you will have a state machine keeping track of where you
are, and as you receive a byte after you have processed the mask you unmask
it and process it.  I don't see that it adds much complexity.

-- 
John A. Tamplin
Software Engineer (GWT), Google