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b838242e01
changes. The first is that Port objects don't allocate memory for service and RPC results unless that information is set. This reduces the size of a bare Port from 92 to 40 bytes on my machine. The second change is that PortList now has the notion of a "default port state," which is the state of any ports that didn't receive a response. These ports don't need an allocated Port object, which saves a lot of memory in scans where most ports didn't get a response.
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 ).