What's the proper way to modify the tvb content for upper layer dissection ?

[Sylvain Munaut <246tnt () gmail com>]

Hi,

I have a protocol where the payload for the next layer is not simply
the rest of the tvb ( The last nibble of the last octet of data octet
needs to come from some fields in the header ).

So before I handoff the tvb for further dissection (or hand it off to
the segmentation handling), I need to alter it. What's the proper way
to do that and ensure I don't create a memory leak ?

Cheers,

    Sylvain
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