[bug #45833] support load/save of classdef objects

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Follow-up Comment #97, bug #45833 (group octave):

I agree that it is hard to see how MATLAB is handling these values internally
just by looking at the bytes in the saved file.
But they are documenting that the "Maximum Size of Each Variable" in the '-v6'
and '-v7' formats is "2^31 bytes per variable". So, I'm *guessing* that they
tread all of these indices and offsets as signed integers internally.

https://www.mathworks.com/help/matlab/ref/save.html#btox10b-1-version

The attached patch would probably fix the potential integer overflow and
alignment issues. (At least, the ones that the compiler warned about.) I tried
to make only minimal changes and not change any function interfaces.

If that looks good to you, I'd like to add a proper commit message and push
that change to the stable branch in time for Octave 11.


(file #58223)

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Name: bug45833-alignment-overflow-v0.patch Size: 6.0KiB

<https://file.savannah.gnu.org/file/bug45833-alignment-overflow-v0.patch?file_id=58223>


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