Thank you for the response.

On Mar 8, 5:59 am, Evan Jones <ev...@mit.edu> wrote:
> On Mar 8, 2011, at 2:12 , Linus wrote:
>
> > At a later stage in the code, the values of (say) Message A are
> > changed by the user. Is there a way of modifying only Message A and
> > updating the file on disk, without loading the composite Message C
> > updating the Message A and flushing entire contents to disk again?
>
> Not really: protocol buffers are a variable length encoding, so  
> changing Message A could change the length, so overwriting doesn't  
> really work, at least not without additional checks and effort.
>
> Evan
>
> --http://evanjones.ca/

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