Re: Byte swapping and bindat

[Po Lu]

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?)