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Re: Byte swapping and bindat

From: Stefan Monnier
Subject: Re: Byte swapping and bindat
Date: Fri, 10 Jun 2022 09:32:31 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

> 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 :-)


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