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From: Gerd <GerdM.O@t-online.de>
Newsgroups: comp.lang.ada
Subject: Re: Does Ada support endiannes?
Date: Thu, 15 Dec 2011 03:27:48 -0800 (PST)
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Date: 2011-12-15T03:27:48-08:00
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On 14 Dez., 21:16, Gautier write-only <gautier_niou...@hotmail.com>
wrote:

The problem space requires integers (signed), so using unsigned is not
the right option.

Could you please explain: What do you think how the data send from 68k
to x86 will be converted from one data layout to the other? Will it
happen "magically" on the wire? I think, conversion must be done
explicit either on one side or on the other side, and this requires
some code.

Currently I use the htonl ntohl functions for it, which (as stated
above) is not a good choice as it limits the allowed values to
unsigned.


> On 14 d=E9c, 17:16, Gerd <Gerd...@t-online.de> wrote:
>
> > Are you sure the "/" and mod would work correct?
>
> > Assume, that the Value 16#000000FF# shall be converted to
> > 16#FF000000#.
>
> > Native : Integer :=3D 16#000000FF#;
>
> > Remote : Integer;
>
> > Remote :=3D 16#01000000# * (Native mod 16#000000FF#); -- overflow!
>
> > PS: The task is to exchange Integer Values between an Motorola 68k and
> > an Intel x86.
>
> Then you will use modular types, and with a definite size.
> =A0 Native: Unsigned_32;
> =A0 Remote: Unsigned_32;
> They never overflow.
> But typically (as you can see in Zip-Ada [1]) you won't presume
> anything about the native endianness.
> The "/" and "mod" (or faster: "Shift_Right" and "and") will do the job
> automatically for you.
> So your code will work on Intel, PowerPC, 68K - whatever - and
> communicate with a remote hardware or media with a specific
> endianness.
>
> [1]http://unzip-ada.sf.net/za_html/zip-headers__adb.htm#32_12
> _________________________
> Gautier's Ada programminghttp://gautiersblog.blogspot.com/search/label/Ad=
a
> NB: follow the above link for a valid e-mail address