Mega Code Archive
Int To Long Compressor
<![CDATA[
//package com.myapp.util.cache.compress;
public class IntToLongCompressor {
public static long pack(int x, int y) {
long xPacked = ((long)x) << 32;
long yPacked = y & 0xFFFFFFFFL;
return xPacked | yPacked;
}
public static int unpackX(long packed) {
return (int) (packed >> 32);
}
public static int unpackY(long packed) {
return (int) (packed & 0xFFFFFFFFL);
}
public static void main(String[] args) {
int x = -23664;
int y = -6543;
System.out.println("x= "+Integer.toHexString(x));
System.out.println("y= "+Integer.toHexString(y));
long pack = pack(x,y);
System.out.println("pack= "+Long.toHexString(pack));
int x2 = unpackX(pack);
System.out.println("x2= "+Integer.toHexString(x2));
int y2 = unpackY(pack);
System.out.println("y2= "+Integer.toHexString(y2));
testAll();
}
private static void testAll() {
long pack, iteration = 0;
int iTmp, jTmp;
for (int i = -100000; i <= 100000; i++) {
if (i % 100 == 0)
System.out.println("i = "+i+ ", iterations = "+iteration);
for (int j = -100000; j <= 100000; j++, iteration++) {
pack = pack(i, j);
iTmp = unpackX(pack);
jTmp = unpackY(pack);
if (i != iTmp || j != jTmp) {
throw new RuntimeException("i="+i+", j="+j);
}
}
}
}
}
]]>