Role of subtpe_seek_read in wth stucture

"Raman Singla" <[email protected]>
Newsgroups gmane.network.ethereal.devel
Message-ID <[email protected]>
HI,
Kindly tell me the role of having a seek_read function (while writing for a new capture format). 

writing read function & initializing wth->subtype_read with it one can understand as it is rquired for reading a packet, 

but what is role of wriring of seek_read & intilizing wth->subtype_seek_read?

what will happen when user will operate if one not writing seek_read & initialing 
wth->subtype_seek_read with NULL.

regards
Raman

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