> > i believe a .prc or .pdb file in palm ram is NOT FRAGMENTED. :)
> > (at least, each resource chunk isn't). you can get a reference to
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ (the important bit)
> > the start of your .pdb and read it from there using a pointer.
>
> Oh my goodness, this would be so incredibly unlikely to work in practice
> that it isn't even worth considering. In development situations where
> you've got an empty device, yes, the resources will probably be contiguous.
> But your real users will have stuff on their devices, and things get moved
> around, re-compacted, etc. Things will be fragmented nearly all the time
> in the real world.
>
> Resources can move in memory any time that they're not locked. Plus, the
> headers for the chunks will be different, and of different sizes, on
> various OS releases. Whenever some app is deleted, there's a hole, and the
> next thing to get installed might end up partially inside that hole, and
> perhaps partially outside of it.
the point is, you dont access a chunk unless it is locked.
> This is no different from saying "well, usually a file will be contiguous
> on my hard drive, so I'll just do a low level read of the sectors and cross
> my fingers." No sane person would take that risk if they knew how things
> work even in general.
>
> In short, this is a wildly bad idea, no matter what OS version you're on.
> (No offense to Aaron - perhaps he's had lots of cold medicine today or
> something...)
maybe i missed the important bit of info.. if you LOCK the resource,
you can guarentee it is contiguous.. but, i am not saying that a
whole file must be contiguous.. with the palmos in its current state,
the resources must be in their own chunks (limited to 64k now)
we have 1Mb+ files for liberty, and, we lock every 16k chunk. sure,
not every 16k chunk will follow contigously, but, we know that each
16k chunk when locked is contiguous.
:)
// az
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