rsync - Jan 2013 - Want details of different rsync protocol versions

Hello,
I am studying rsync to do project on it.
I want to get more details about rsync protocol versions

I found major versions like 23,24,29,30 and in latest code protocol version
31. versions in code where important decisions are taken.

I also searched for RFC of rsync protocol and I found RFC 5781.
http://tools.ietf.org/html/rfc5781

It's irrelevant to me as it describes rsync uri scheme and not the actual
protocol details and how it should be implemented.

So, this lead to one more doubt ,"why rsync's is not documented in RFC
since it is a protocol" ?

Any suggestions , where can I find detailed rsync protocol description?

Thanks in advance.

Regards,
-- 
Akshay Patil ,
PICT ,Pune
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On Thu, Jan 10, 2013 at 10:29 PM, akshay patil <akshay29patil at
gmail.com>wrote:
> Any suggestions , where can I find detailed rsync protocol description?
>
Sadly, the rsync protocol is a strange binary protocol that is only
documented in the code itself.  The sequence of binary bytes varies based
on both version and options, and nothing in the bitstream itself allows
someone to read it without knowing the implied meaning of the next byte.
 It would be possible to document the protocol in a pseudo-code form using
some nested entity definitions and lots of "if version >=" and
"if option"
conditionals, but I don't believe that has yet been done.

..wayne..
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