Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt> (The WebSocket protocol) to Proposed Standard

Barry Leiba <barryleiba@computer.org> Wed, 13 July 2011 14:41 UTC

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Date: Wed, 13 Jul 2011 10:41:49 -0400
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From: Barry Leiba <barryleiba@computer.org>
To: Mykyta Yevstifeyev <evnikita2@gmail.com>
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Cc: "hybi@ietf.org" <hybi@ietf.org>, "draft-ietf-hybi-thewebsocketprotocol@tools.ietf.org" <draft-ietf-hybi-thewebsocketprotocol@tools.ietf.org>
Subject: Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt> (The WebSocket protocol) to Proposed Standard
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>>>> BIT            =  "0" / "1"
>>>
>>> implies that<BIT>  may be either ASCII 0x31 - "1" - or ASCII 0x30 - "0".
>>>  Once more, ABNF is for chars/octets, not bits.

Mykyta, be careful not to confuse the code for generating ABNF (for
which what you say above is correct) with the *use* of ABNF in
protocol specifications (for which you're wrong).

The construct above, << BIT = "0" / "1" >>, says that when you're
writing ABNF, you use the characters "0" and "1" (codes 30 and 31) to
represent the bit values.  But when we apply that ABNF in a protocol,
we can get any of these:

the-letter-c = %b01100011  ; also %x63

halfbyte-value-3 = %b0011  ; also %x3

two-bits-both-set = %b11

a-single-one-bit-by-itself = %b1

-----
%x3 and %x03 are not the same thing, and %b00000011, %b0011, and %b11
are not the same things.

Barry