added CompactedCoords util

core/src/main/java/mc/core/utils/CompactedCoords.java

@@ -0,0 +1,23 @@
+package mc.core.utils;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class CompactedCoords {
+    public static int compressXZ(int x, int z) {
+        if (x < Short.MIN_VALUE || x > Short.MAX_VALUE ||
+                z < Short.MIN_VALUE || z > Short.MAX_VALUE) {
+            log.warn("Coord over range: [{},{}]", x, z);
+        }
+
+        return ((x & 0xFFFF) << 16) | (z & 0xFFFF);
+    }
+
+    public static int[] uncompressXZ(int compactValue) {
+        //TODO не нравится мне такие костыли
+        return new int[]{
+                (int)(short) (compactValue >> 16),
+                (int)(short) (compactValue | 0xFFFF0000)
+        };
+    }
+}

core/src/test/java/mc/core/utils/TestCompactedCoords.java

@@ -0,0 +1,45 @@
+package mc.core.utils;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Random;
+
+
+public class TestCompactedCoords {
+    @Test
+    public void testSimple() {
+        for (int z = -100; z <= 100; z++) {
+            for (int x = -100; x <= 100; x++) {
+                int compressXZ = CompactedCoords.compressXZ(x, z);
+                int[] xz = CompactedCoords.uncompressXZ(compressXZ);
+
+                Assert.assertEquals(x, xz[0]);
+                Assert.assertEquals(z, xz[1]);
+            }
+        }
+    }
+
+    @Test
+    public void testRandom() {
+        Random random = new Random();
+        int x,z;
+
+        for (int i = 0; i < 100; i++) {
+            do {
+                x = random.nextInt();
+            } while (x < Short.MIN_VALUE || x > Short.MAX_VALUE);
+
+            do {
+                z = random.nextInt();
+            } while (z < Short.MIN_VALUE || z > Short.MAX_VALUE);
+
+
+            int compressXZ = CompactedCoords.compressXZ(x, z);
+            int[] xz = CompactedCoords.uncompressXZ(compressXZ);
+
+            Assert.assertEquals(x, xz[0]);
+            Assert.assertEquals(z, xz[1]);
+        }
+    }
+}