question: private static int ipToBytes ( String ip , byte [ ] bytes , boolean mustHave4 ) throws IPMatcherException { String [ ] parts = ip . split ( "\\." ) ; if ( parts . length > 4 || mustHave4 && parts . length != 4 ) { throw new IPMatcherException ( "Malformed IP specification " + ip ) ; } try { for ( int i = 0 ; i < parts . length ; i ++ ) { int p = Integer . parseInt ( parts [ i ] ) ; if ( p < 0 || p > 255 ) { throw new IPMatcherException ( "Malformed IP specification " + ip ) ; } bytes [ i ] = ( byte ) ( p < 128 ? p : p - 256 ) ; } } catch ( NumberFormatException nfe ) { throw new IPMatcherException ( "Malformed IP specification " + ip , nfe ) ; } return parts . length ; }
target:  Fill out a given four-byte array with the IPv4 address specified in the given String