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Q: 

Hash Table Key generation

I am trying analyze a code to parse a string which has a maximum string length of 4000 characters . The coder is using the following following formula to generate the key 

(fromid^(from_id<<18)^(toid<<2)
^(toid<<16)^(repetition<<4)^(repetition<<14)^
(tbranch_id<<6)^(tbranch_id<<12)^
(fbranch_id<<8))^(fbranch_id<<10)

I cant understand the rationale behind such a formula ?

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