cod file size real-world limits

[Mark Rejhon]

[WorldIRC]

[Mark Rejhon]

[WorldIRC]

[eggamar]

[jcomeau_ictx]

Wow, after I posted this last time you guys must have had a server crash... offline for a few days, and now I had to re-register... anyways:

Anybody have experience getting large applications (.cod size over the 64k code/64k data that RIM still says is the limit) to work? Since the 4.0 JDE allows it, it should be able to work on 4.0 devices. And in fact I've gotten a 500k .cod to load and run on a 7290 (not just on the simulator) but more than one has been problematic so far.

[jcomeau_ictx]

I'm beginning to understand how this works.

It turns out that the more recent JDEs (the 4.0 for sure, haven't tried 3.7) allow you to bypass the limit in a sneaky way. The limit is still there; however, .cod files that exceed it still compile, but if you look at them with a debugger or dump utility like xxd (hint: install Cygwin) you can see that the magic number is no longer 0xc0de but 'PK'... in other words, it's a ZIP file masquerading as a .cod file. And if you unzip them you'll see that they are composed of a number of sub-cod's blather.cod, blather-1.cod, blather-2.cod, etc.

Now, the simulator seems to be able to handle these just fine, and so can a regular device (tested on 7290) under certain circumstances. For one thing, the large ones seem to need to have their own .jad or .alx; if a zipped .cod is in a list of multiple cods in a .jad or .alx, the device will choke on reaching it. And a 800k .cod wouldn't work no matter what, it just put the device in an endless reboot loop.

Regarding reaching your website: it turns out I can always reach it as www.blackberrydevelopers.com, and for a while after that my bookmark as www.blackberryforums.com will also work. But it I try to access it as www.blackberryforums.com "cold", that is, after my DNS cache times out, it's no go.