[M3devel] files larger than 2gig

[Olaf Wagner]

Quoting Jay <jay.krell at cornell.edu>:

>
> C:\dev2\cm3.2\m3-libs\libm3\src\os\Common\File.i3
>
>
> TYPE
>   Status = RECORD
>     type: Type;
>     modificationTime: Time.T;
>     size: INTEGER;
>   END;
>
>
> size: INTEGER causes exceptions when you use the Modula-3 gui
> and browse to a directory with files larger than 2 gig.

This is a known limitation on all 32 bit platforms.

> I suggest size be changed to LONGREAL, which generally has a 53 bit mantissa
> (out 64 bits total) and thus can represent integers very much larger  
>  than INTEGER.

I wouldn't like that. Sizes are no real numbers, really ;-)
Either use LONGINT or rely on INTEGER being large enough (64 bit
on all 64 bit targets).

> LONGINT is a tempting option but doesn't help on the current NT386 platform,
> and I think 53 bits will last a very long time.

What exactly was the problem in makeing LONGINT work on NT386?

> I'm just trying out such a change and I can see it is not source compatible:
>
>
> "../src/rw/FileRd.m3", line 73: incompatible argument types: MIN
> "../src/rw/FileRd.m3", line 140: types are not assignable
> 2 errors encountered
> "../src/rw/FileWr.m3", line 87: incompatible argument types: MIN
> "../src/rw/FileWr.m3", line 103: incompatible argument types: MAX
> 2 errors encountered
>
>
> Nevertheless I think it should be done, probably even for this release.

I'm not convinced...

Olaf
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