Hi,
Given that calibre is a big producer of both azw3 and joint mobis, and calibre does NOT generate a RESC section, then yes we need to make sure we don't barf on calibre generated files.
That is why I thought this fix is needed. Also, if calibre tries to keep an old RESC around, it would have the wrong skelids in the RESC, so we really need to protect against missing or ill-formed RESC sections and ignore them.
Take care,
Kevin
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