data structure for snort rules

[snort user <snort_user2004 () yahoo com>]

hi 
 
i was going thru the code of snort and wanted to figure out the data structures that are used to store the rules. i 
figured that there are 3 linked lists, RTN, OTN, OptFunc list. is there any material which i could use to better 
understand the data structures and how these are used for rule matching. 
 
thanks.

                
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