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package fun;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import shared.Tools;
public class Dongle {
public static void main(String[] args) {
long millis=System.currentTimeMillis();
if(args.length>0) {
millis=parse(args[0]);
}
long a=encode(millis);
System.err.println(a);
System.err.println(millis);
System.err.println(decode(a));
}
public static final boolean check(Object...args) {
long a=min, b=max;
if(args!=null && args.length>1) {a=(Long)args[1];}
if(args!=null && args.length>2) {b=(Long)args[2];}
a=decode(a);
b=decode(b);
long x=System.currentTimeMillis();
return (b>a && b-a<limit && x>=a && x<=b);
}
private static long encode(long x) {
x^=number;
long a=x&mask;
long b=x&(mask<<1);
x=a|(Long.rotateLeft(b, rot));
a=x&mask2;
b=x&(mask2<<2);
x=a|Long.rotateRight(b, rot2);
a=x&mask3;
b=x&(mask3>>>4);
x=a|Long.rotateLeft(b, rot3);
return x;
}
private static long decode(long x) {
long a=x&mask3;
long b=x&(mask3>>>4);
x=a|(Long.rotateRight(b, rot3));
a=x&mask2;
b=x&(mask2<<2);
x=(a|(Long.rotateLeft(b, rot2)));
a=x&mask;
b=x&(mask<<1);
x=(a|(Long.rotateRight(b, rot)))^number;
return x;
}
private static long parse(String s) {
try {
if(Tools.isNumeric(s)) {return Long.parseLong(s);}
Date d=sdf.parse(s);
System.err.println(d);
return d.getTime();
} catch (ParseException e) {
return -1L;
}
}
private static final String pattern="MM-dd-yyyy";
private static final SimpleDateFormat sdf=new SimpleDateFormat(pattern);
private static final long min=-6788251374689658131L;
private static final long max=2715152938288332905L;
private static final long number=4964420948893066024L;
private static final long mask=0x5555555555555555L;
private static final long mask2=0x3333333333333333L;
private static final long mask3=0xF0F0F0F0F0F0F0F0L;
private static final long limit=346896001029L;
private static final int rot=26;
private static final int rot2=44;
private static final int rot3=16;
}
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