OpenEuphoria

Re: File size limit

• Posted by Matt Lewis <matthewwalkerlewis at gmail.?o?> Jun 11, 2008
• 689 views

Kat wrote:
> 
> 
> You can't seek over 2gbytes, but you can getc() and gets() to any length. So
> i made a procedure to getc() the number of bytes i wanted to seek(), and then
> there i was.
> 
> I have asked for larger file numbers too, but i don't think we will get them
> in Eu v4. Even if we did, we could not do basic full precision integer math
> on the numbers over 4gigabytes (there are such libs in the archives tho).

Larger file numbers are probably pretty easy (I think it's just increasing an
array size and updating a macro).  How many do you want?  I don't recall this
specifically (at least not specifically).

You can do full precision integer math using atoms to much larger sizes
than 2^32.  The limit on precision is 2^53, or:

   9,007,199,254,740,990

That's over 9 quadrillion, or about 9 terabytes (in disk manufacturer style
units).  Granted, this isn't using native machine integers, but probably 
faster than the above quoted libraries.

If you need numbers bigger than that for file manipulation, I'd suggest that
you need a better algorithm.

Matt