IPToRadixkey creates a binary string representation of an IP address.

MarshalBytes returns the bytes of[bytes of footer string][len of footer string][magic num]when this is writen to our underlying record file it is prepenededby the length of the bytes mentioned above so this will appear as anormal record (but it won't parse normally).

MaskStrToUint8 is a helper that just converts a possible mask string to a 10 based uint8.

NewPrefixTree creates a new PrefixTree with an empty radix tree.

Opens the underlying reader with buffer sizes specified in the arguments.

A Footer is appended at the very end of a RecordFile(all types except the FlatRecordFile type )The end of a footer should always be the magicbytes uint32using that an application can easily see if a file is of our typeRight before that the previous uint32 is the length of the footerbytes.

PrefixTree holds a radix tree which clients can insert IPs and masks in , and also lookup for their existence.

A record file knows the number of records it has stored,every record is preceded by a 32bit unsigned value that isthe length of that record in Big Endian and after that thebytes of the record.