Re: Request for detailed documentation of git pack protocol

From: Jakub Narebski <jnareb@gmail.com>
Date: Jun 3, 2009, 21:20 UTC
Message-ID: <200906032320.23559.jnareb@gmail.com>
In-Reply-To: <alpine.LSU.2.00.0906032147330.31588@hermes-2.csi.cam.ac.uk>

On Wed, 3 Jan 2009, Tony Finch wrote:

Show 9 quoted lines

> On Wed, 3 Jun 2009, Jakub Narebski wrote:
> >
> >      HEXDIGIT = 0-9 / a-f
> >
> > Well, it should probably be spelled in full. Probably, because I have
> > no experience with using ABNF... and didn't do my research :-)
> 
> The ABNF core rules include a definition for HEXDIG. See appendix B of
> RFC 5234.

I have found it _after_ sending this post in Wikipedia article (which is shorter than RFC 5234), but thanks anyway.

> > (should HEXDIGIT use lowercase a-f, or can it use uppercase A-F?)
> 
> Double-quoted strings in ABNF are case-insensitive ASCII, so the HEXDIG
> rule accepts both. You need to use %x61 if you want a but not A.

        HEXDIG_LC = DIGIT / %x61-%x66  ; 0-9a-f, case sensitive

Actually git accepts both lowercase and uppercase in HEXDIG (at least for pkt-length), but it prefers lowercase.

-- 
Jakub Narebski
Poland