Re: [hybi] Review of draft-ietf-hybi-thewebsocketprotocol-13

[Bjoern Hoehrmann <[e-mail]>]

* Richard L. Barnes wrote:
>If frames are valid utf-8, then you don't need to keep any state (on
>either end of the connection).

That's somewhat misleading. If you accept for instance both binary and
text frames, you have to maintain the type of the first frame so you can
reject continuation frames of the wrong type. You may also have to main-
tain state coming from extension data or your protocol may require other
state to be maintained. A minimal byte-oriented UTF-8 validator has nine
states http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ and that seems less
onerous to maintain than having fragmenting senders and forwarders to
find where character and byte boundaries coincide (you need to have the
encoded text available and re-sychronize to character boundaries, or
have the character stream available with analyze the encoded widths, or
you have to include padding within the text, to start sending).
-- 
Björn Höhrmann · mailto:[e-mail] · http://bjoern.hoehrmann.de
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