Re: [hybi] hum #3: Message

[Dave Cridland <[e-mail]>]

On Fri Aug  6 15:17:19 2010, John Tamplin wrote:
> Ok, does this summarize the various positions regarding chunking and
> lengths?
> 
> 
>    - We want to have a length of the complete message when it is  
> available
>    to make buffer management simpler for the receiver
>    - We want to be able to fragment messages to avoid extra  
> buffering when
>    the length of the entire message is not known up front, such as  
> when sending
>    dynamic content, compressing frames, etc.
>    - We want to keep small frames having small overhead (though  
> there is a
>    limit on how much this matters given TCP/IP overhead)
>    - We want to be able to send very large files in a single  
> fragment so we
>    can just hand it off to sendfile or equivalent
> 
> What about the following:
> 
>    - 1 bit - Initial fragment
>    - 1 bit - Final fragment
>    - 1 bit - reserved
>    - 5 bits - opcode
>    - 8 bits - short length
>    - [if length = 255: 8 bytes - length]
>    - [if Initial = 1 and Final = 0: 8 bytes - overall message  
> length, with 0
>    meaning "unknown"]
>    - length bytes of payload

I'm fine with this.

It feels like a solid starting point.

Dave.
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