How to make an in memory input/output stream?

Hi,

I am trying to write some binary data.
Now I want to have an easy way to test the data I wrote to the stream.

Knowing (with-output-to-string) and (with-input-from-string) I am
thinking of something along this style, but with element-type as 'byte.

(let ((io (make-buffer)))
(write-the-binary (buffer-output-stream io))
(test-the-binary (buffer-input-stream io)))

However, in Hypersepc there is no way to create an output stream that
write to memory. Is there any portable way to do this? I know that I
could write to a temp file and read back, but it doesn't seems like the
clean way to do it.

Regards,

.

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