Coding

I’m reminded now about the virtues of singular exits – that is, functions with only one exit point. I was a bit lazy while writing the FAT driver code, and put in a bazillion exit points. The only thing that was really surprising about that, in hindsight, is how long I managed to get away… Read more

For the last day or two I’ve been getting well versed on the MMC/SD card protocol. You can’t actually get official documentation, officially, but I’ve managed to find a few documents from SanDisk which do actually cover the important parts. There’s also heaps of existing implementations out there which I’ve been referring to, so development… Read more

A few weeks ago a user of my Keychain framework noted that searches by creation or modification date just didn’t work. So I started digging around, and came to the conclusion eventually that the Security framework was playing funny buggers. Long story short, after a short thread on apple-cdsa Ken McLeod was able to confirm… Read more

I’ve added FAT16 support to my driver. It was as expected a pretty trivial change, since the only real difference is the size of FAT entries and the location (and size) of the root directory. I haven’t tested I/O yet, but directory traversal works fine. I’ve also realised that the current system of treating directories… Read more

So, a few days ago I showed file reading working with my FAT driver. Today, I give you writing. It took a little bit of tweaking to get right; I made a few mistakes here and there. I’m not 100% confident in it yet, but it’s at least working for the simple case – opening… Read more

Ain’t it beautiful? I thought it wouldn’t take too much extra effort to be able to read data from files, and I was right! I’ve been working on it for no more than two hours, I shouldn’t think, and there it is. And even though this is only a small test file, luckily the Flash… Read more