flypig.co.uk

Welcome

I'm David Llewellyn-Jones and this is my homepage. I'm a researcher in computer security who's also interested in programming and graphics. You might be interested in my research, my software or my random musings.

Want to know more about me? Here's a personality sketch written by a psychologist when I was in school.

“David is of high intelligence, although lacking in true creativity. He has a need for order and clarity, and for neat and tidy systems in which every detail finds its appropriate place. His writing is rather dull and mechanical, occasionally enlivened by somewhat corny puns and by flashes of imagination of the sci-fi type. He has a strong drive for competence. He seems to have little feel and little sympathy for other people and does not enjoy interacting with others. Self-centered, he nonetheless has a deep moral sense.”

Wow. Harsh. But disturbingly accurate.

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News

6 Aug 2018 : TapirMail source on GitHub: lightweight email for RISC OS #
Prompted by the very motivational RISC OS advocate Steffen Huber, I've started putting my old RISC OS source code up on GitHub. Steffen contacted me hoping to make some changes to TapirMail, the self-contained POP3 mail client I used to sell commercially. I wouldn't have expected anyone to still be interested in it, so thank you Steffen for proving me wrong!

Looking over the source code, I see I started coding it in 2003, with the last version released in 2013, so it's a decade-worth of on-and-off coding. I didn't use any version control for it back then, so the details of how it developed will be forever lost. I also coded differently back then. It was probably the first large C application I'd written from scratch, and my transition from using the BASIC interpreter shows: the main application is coded as a single 21,000-line source file! The full source is now available on GitHub released under an MIT licence, allowing you to judge my younger self. Expect more code-dumps of my old RISC OS software to follow in the future.
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31 Jul 2018 : Pedalo 0.2-1 sails into harbour #
The latest version of Pedalo, version 0.2-1, has passed through the harbour validation and checks, and is now available for download from the Jolla store. If you're on Sailfish OS, and like to pedalo (or cycle), then grab yourself a free copy and get cycling.
27 Jul 2018 : MATTS source now online #
Thanks to promting from Prof, Asim at the National University of Computer and Emerging Sciences, Pakistan, I finally got around to putting the MATTS source code up online (it took seven years, which is a record even for me). Take a look at the MATTS page for more info. Thanks Asim!
19 Jul 2018 : Pedalo #
If you're a ardent pedalo user, and your mobile phone OS of choice is Sailfish, you should definitely check this new page on the site.
18 Jul 2018 : Pedalo approved! #
My Pedalo app was just approved for release in the Jolla App Store. Exciting times!
Pedalo is now approved!