org.codehaus.jackson.smile.SmileUtil Maven / Gradle / Ivy
package org.codehaus.jackson.smile;
/**
* Class for miscellaneous helper methods.
*/
public class SmileUtil
{
public static int zigzagEncode(int input) {
// Canonical version:
//return (input << 1) ^ (input >> 31);
// but this is even better
if (input < 0) {
return (input << 1) ^ -1;
}
return (input << 1);
}
public static int zigzagDecode(int encoded) {
// canonical:
//return (encoded >>> 1) ^ (-(encoded & 1));
if ((encoded & 1) == 0) { // positive
return (encoded >>> 1);
}
// negative
return (encoded >>> 1) ^ -1;
}
public static long zigzagEncode(long input) {
// Canonical version
//return (input << 1) ^ (input >> 63);
if (input < 0L) {
return (input << 1) ^ -1L;
}
return (input << 1);
}
public static long zigzagDecode(long encoded) {
// canonical:
//return (encoded >>> 1) ^ (-(encoded & 1));
if ((encoded & 1) == 0) { // positive
return (encoded >>> 1);
}
// negative
return (encoded >>> 1) ^ -1L;
}
}