usb transfer length

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Hello,

When performing usb transfer we request for maximum size of transfer,
yet another size of message (shorter or longer) might be sent from
device to host.

Are both cases (shorter/longer) legal in usb standard  ?

In case both are legal:
If it is shorter, I guess there is no issue at all.
If it is longer - the host must perform transfer for the remaining of
the message. Is that correct ?

Thank you,
ranran
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