From: chris <spamoff.danx@ntlworld.com>
Subject: Re: Any examples of Byte Ordering Functions
Date: Sun, 19 Oct 2003 18:52:58 +0100
Date: 2003-10-19T18:52:58+01:00 [thread overview]
Message-ID: <d6Akb.6022$mM1.5008@newsfep4-winn.server.ntli.net> (raw)
In-Reply-To: <bmufht$ht2$1@sparta.btinternet.com>
Martin Dowie wrote:
> You don't need to look up the RM (Annex B.2) wrt the
> predefined modular types in package "Interfaces" and there
> you will find Shift_Left/Shift_Right/etc routines. These are
> defined as "Intrinsic", which means they are "built in" to the
> compiler - i.e. it should have a blinking good idea of a good
> representation of this on the target h/w.
Didn't know about that, thanks! That means if we want to output any
word to a stream in big endian we can do:
procedure Write_Big_Endian
(Stream : access Root_Stream_Type'Class;
W : in Word) is
A, B : Byte;
begin
A := Byte (Shift_Right (Unsigned_32(W), 8));
B := Byte (W and 16#00FF#);
Byte'Write (Stream, A);
Byte'Write (Stream, B);
end Write_Big_Endian;
and for little endian we can do:
procedure Write_Little_Endian
(Stream : access Root_Stream_Type'Class;
W : in Word) is
A, B : Byte;
begin
A := Byte (W and 16#00FF#);
B := Byte (Shift_Right (Unsigned_32(W), 8));
Byte'Write (Stream, B);
Byte'Write (Stream, A);
end Write_Little_Endian;
and this will work whatever the platform we compile on?
next prev parent reply other threads:[~2003-10-19 17:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-15 17:42 Any examples of Byte Ordering Functions Bill Sheehan
2003-10-15 18:55 ` Larry Kilgallen
2003-10-15 18:44 ` Hyman Rosen
2003-10-16 1:01 ` James Rogers
2003-10-16 13:32 ` Hyman Rosen
2003-10-16 14:59 ` Martin Dowie
2003-10-16 20:00 ` tmoran
2003-10-17 12:08 ` Martin Dowie
2003-10-19 15:22 ` chris
2003-10-19 17:25 ` (see below)
2003-10-19 13:45 ` chris
2003-10-19 16:53 ` Martin Dowie
2003-10-19 17:52 ` chris [this message]
2003-10-19 19:24 ` Martin Dowie
2003-10-19 20:47 ` Jeffrey Carter
2003-10-19 22:53 ` tmoran
2003-10-20 4:14 ` Jeffrey Carter
2003-10-23 20:36 ` Laurent Pautet
2003-10-23 21:37 ` Simon Wright
2003-10-24 4:37 ` Simon Wright
2003-10-26 15:05 ` Georg Bauhaus
2003-10-23 20:44 ` Laurent Pautet
2003-10-23 21:03 ` Laurent Pautet
2003-10-15 19:58 ` Frank J. Lhota
2003-10-16 16:28 ` Stephen Leake
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