Re: [Chicken-users] map-file-to-memory and random access

[Mark Voortman]

>> I'm using map-file-to-memory to map a file in memory and then use
>> move-memory! to read/write the contents. However, I was wondering if it
>> is possible to random access the memory mapped file? For example,
>> read/write only the bytes at position 5 to 10. If I use move-memory! it
>> always starts reading/writing from byte 0.
>
> Right now, the only solution that comes to mind is to use
> "memory-mapped-file-pointer" and do really dirty pointer arithmetic (see
> "pointer->address" and "address->pointer").
>
> Hm... "move-memory!" should probably get an additional argument giving
> an offset.
> What do you think?

I think that's a good idea, but note that you'll need two additional
arguments. One offset for the source and one for the destination.

Cheers, Mark