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scan response, instead of checking for a current state of PORT_OPENFILTERED. The code calls getPortState, but the port may not have been assigned a state, again because of the new Port allocation architecture, so the function returns -1. It would make sense to have getPortState return the default port state if a Port has not been allocated, but there are two other places it is used where the code relies on it returning -1 to indicate that a port has not received a state yet.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).