[M3devel] files larger than 2gig

[Jay]

Hm..I'm not sure.
Integers have certain properties, like dividing an integer by an integer yields an integer,
that floating point doesn't. Integer division tends toward zero faster than floating point division.
I can try getting it all to compile with LONGINT maybe instead.
The current behavior is pretty lame.

 - Jay

----------------------------------------
> From: jay.krell at cornell.edu
> To: m3devel at elegosoft.com
> Date: Mon, 22 Jun 2009 12:58:17 +0000
> Subject: [M3devel] files larger than 2gig
>
>
> 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.
>
>
> 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.
>
>
> 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.
>
>
> 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.
>
>
> - Jay