From: Simon Wright <simon@pushface.org>
Subject: Re: Stream_Element_Array
Date: Thu, 15 Sep 2011 22:42:03 +0100
Date: 2011-09-15T22:42:03+01:00 [thread overview]
Message-ID: <m262ktfpp0.fsf@pushface.org> (raw)
In-Reply-To: 631f3859-8118-4f4c-a684-152ee5f589bf@o15g2000vbe.googlegroups.com
Alexander Korolev <antonovkablog@gmail.com> writes:
> On Sep 16, 12:11 am, Simon Wright <si...@pushface.org> wrote:
>> Alexander Korolev <antonovkab...@gmail.com> writes:
>> > My confusion is about the order of the Stream_Element for the cases I
>> > posted
>>
>> That has to depend on what the thing at the other end is expecting!
>>
>> If there's no proper specification, do you maybe have some C code that
>> we could help to work it out from?
>
> It expecting 2 byte Lenth: |192|lenght (MSB)|Lenth (LSB)|Data|
> checksum|
> " The message length is a 2-byte field (MSB) equal to the size of the
> data field and checksum
> before byte stuffing has been executed" - from the doc
I don't know what they mean by (MSB) in "a 2-byte field (MSB)".
That said, it seems pretty clear that the first byte on the wire is to
be the most significant byte of Length : Unsigned_16, so you want
somthing like
Write (Length / 256);
Write (Length and 255);
or maybe
with Ada.Text_IO; use Ada.Text_IO;
with Interfaces;
procedure Streaming is
procedure Write (B : Interfaces.Unsigned_8) is
begin
Put_Line ("b => " & Interfaces.Unsigned_8'Image (B));
end Write;
V : Interfaces.Unsigned_16;
use type Interfaces.Unsigned_16;
begin
V := 16#8180#;
Write (Interfaces.Unsigned_8 (Interfaces.Shift_Right (V, 8)));
Write (Interfaces.Unsigned_8 (V and 16#FF#));
end Streaming;
The output is
$ ./streaming
b => 129
b => 128
next prev parent reply other threads:[~2011-09-15 21:42 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-14 3:13 Stream_Element_Array Alexander Korolev
2011-09-14 5:29 ` Stream_Element_Array Per Sandberg
2011-09-14 8:34 ` Stream_Element_Array Alexander Korolev
2011-09-14 8:31 ` Stream_Element_Array Simon Wright
2011-09-14 9:09 ` Stream_Element_Array Alexander Korolev
2011-09-14 9:40 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 9:41 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 10:18 ` Stream_Element_Array Simon Wright
2011-09-14 12:42 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 16:20 ` Stream_Element_Array Simon Wright
2011-09-14 19:53 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 10:53 ` Stream_Element_Array Simon Wright
2011-09-14 12:48 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 14:48 ` Stream_Element_Array Alexander Korolev
2011-09-14 15:08 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 17:16 ` Stream_Element_Array Alexander Korolev
2011-09-14 20:13 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-14 21:29 ` Stream_Element_Array Alexander Korolev
2011-09-15 8:20 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-15 18:58 ` Stream_Element_Array Alexander Korolev
2011-09-15 20:48 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-16 0:20 ` Stream_Element_Array Alexander Korolev
2011-09-15 19:15 ` Stream_Element_Array Alexander Korolev
2011-09-15 20:11 ` Stream_Element_Array Simon Wright
2011-09-15 20:34 ` Stream_Element_Array Alexander Korolev
2011-09-15 21:42 ` Simon Wright [this message]
2011-09-15 21:50 ` Stream_Element_Array Simon Wright
2011-09-16 0:01 ` Stream_Element_Array Alexander Korolev
2011-09-16 0:18 ` Stream_Element_Array Adam Beneschan
2011-09-16 7:22 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-16 10:21 ` Stream_Element_Array Simon Wright
2011-09-16 12:13 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-16 17:20 ` Stream_Element_Array Simon Wright
2011-09-16 19:32 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-16 22:18 ` Stream_Element_Array Simon Wright
2011-09-17 8:18 ` Stream_Element_Array Dmitry A. Kazakov
2011-09-19 23:22 ` Stream_Element_Array Randy Brukardt
2011-09-15 21:28 ` Stream_Element_Array Alexander Korolev
2011-09-15 2:33 ` Stream_Element_Array Alexander Korolev
2011-09-19 23:11 ` Stream_Element_Array Randy Brukardt
2011-09-14 12:19 ` Stream_Element_Array Gautier write-only
2011-09-16 11:17 ` Stream_Element_Array anon
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