how to know size of long raw

I'm storing different types of files (like doc,ppt,pdf) in a long raw column in table.

Could you please let me know how can I get the size of each file for a particular row from the table.

can I retrieve the above information thru sql command or is there any dbms package api's (like dbms_lob.getlength for getting size of blob)to retrieve the size of a longraw.

Thanks in advance whoever respond.

Thx,
praveen.

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