From: Po Lu <luangruo@yahoo.com>
To: Stefan Monnier via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: Byte swapping and bindat
Date: Sat, 11 Jun 2022 08:54:53 +0800 [thread overview]
Message-ID: <87edzwkoiq.fsf@yahoo.com> (raw)
In-Reply-To: <jwv8rq4hcou.fsf-monnier+emacs@gnu.org> (Stefan Monnier via Users list for the's message of "Fri, 10 Jun 2022 09:32:31 -0400")
Stefan Monnier via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:
>> Is there a way to specify a bindat type with fields whose endianess
>> depends on an external parameter (or another field of the type?)
>
> I'm so glad you asked:
>
> (let* ((threshold 32)
> (type (bindat-type (kind uint 8)
> (length sint 32 (> kind threshold)))))
> (list (bindat-unpack type "\x10\x00\x00\x01\x01")
> (bindat-unpack type "\x80\x00\x00\x01\x01")))
> =>
> (((kind . 16) (length . 257))
> ((kind . 128) (length . 16842752)))
>
> That's one of the benefits of the new Bindat :-)
Thanks. Where is that documented?
(And what about an unsigned integer? Is it just `uint', which according
to the doc is a big-endian number?)
next prev parent reply other threads:[~2022-06-11 0:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87pmjglllc.fsf.ref@yahoo.com>
2022-06-10 13:00 ` Byte swapping and bindat Po Lu
2022-06-10 13:32 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-06-10 15:53 ` Eli Zaretskii
2022-06-10 21:42 ` Stefan Monnier
2022-06-11 0:55 ` Po Lu
2022-06-11 5:45 ` Eli Zaretskii
2022-06-10 17:03 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-06-11 0:54 ` Po Lu [this message]
2022-06-11 1:08 ` Stefan Monnier
2022-06-11 1:15 ` Po Lu
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