22:34 <jA_cOp> I have an instance of a C struct with a pointer in it, like so: (define-cstruct _foo ([data _bytes])) how can I convert foo-data to a byte string? I tried passing it to the subbytes function, but it tells me "ending index is out of range" and "valid range: [0, 0]". The length is stored in a separate struct field which is what I'm passing to subbytes

22:35 <jA_cOp> If I change the pointer's type from _bytes to _pointer, then subbytes complains that it expected bytes? but was given a cpointer

22:37 <jA_cOp> Among the FFI functions is a make-sized-byte-string function, but it's unsupported in CS Racket