Re: Lightwight socket IO wrapper

References	<CAPTjJmpuYp5uEDnRJqC9qKj-YkNRx1jW48WsRyRn+U0rzGiTYw@mail.gmail.com> <20150921062713.GA77399@cskk.homeip.net>
Date	2015-09-21 17:57 +1000
Subject	Re: Lightwight socket IO wrapper
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.23.1442822248.28679.python-list@python.org> (permalink)

Show all headers | View raw

On Mon, Sep 21, 2015 at 4:27 PM, Cameron Simpson <cs@zip.com.au> wrote:
> I don't like embedding arbitrary size limits in protocols or data formats if
> I can easily avoid it. So (for my home grown binary protocols) I encode
> unsigned integers as big endian octets with the top bit meaning "another
> octet follows" and the bottom 7 bits going to the value. So my packets look
> like:
>
>  encoded(length)data
>
> For sizes below 128, one byte of length. For sizes 128-16383, two bytes. And
> so on. Compact yet unbounded.

Ah, the MIDI Variable-Length Integer. Decent.

It's generally a lot faster to do a read(2) than a loop with any
number of read(1), and you get some kind of bound on your allocations.
Whether that's important to you or not is another question, but
certainly your chosen encoding is a good way of allowing arbitrary
integer values.

ChrisA

Back to comp.lang.python | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: Lightwight socket IO wrapper Chris Angelico <rosuav@gmail.com> - 2015-09-21 17:57 +1000
  Re: Lightwight socket IO wrapper Marko Rauhamaa <marko@pacujo.net> - 2015-09-21 10:59 +0300
    Re: Lightwight socket IO wrapper Chris Angelico <rosuav@gmail.com> - 2015-09-21 18:07 +1000
      Re: Lightwight socket IO wrapper Marko Rauhamaa <marko@pacujo.net> - 2015-09-21 11:38 +0300
        Re: Lightwight socket IO wrapper Chris Angelico <rosuav@gmail.com> - 2015-09-21 18:45 +1000
          Re: Lightwight socket IO wrapper Marko Rauhamaa <marko@pacujo.net> - 2015-09-21 11:48 +0300
            Re: Lightwight socket IO wrapper Marko Rauhamaa <marko@pacujo.net> - 2015-09-21 11:49 +0300
        Re: Lightwight socket IO wrapper Chris Angelico <rosuav@gmail.com> - 2015-09-21 18:50 +1000
          Re: Lightwight socket IO wrapper Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-09-22 07:59 +0000

csiph-web