Upstream Paper

src/main/java/net/minecraft/server/DataBits.java

@@ -0,0 +1,75 @@
+package net.minecraft.server;
+
+import org.apache.commons.lang3.Validate;
+
+public class DataBits {
+
+    private final long[] a;
+    private final int b;
+    private final long c;
+    private final int d;
+
+    public DataBits(int i, int j) {
+        this(i, j, new long[MathHelper.c(j * i, 64) / 64]);
+    }
+
+    public DataBits(int i, int j, long[] along) {
+        //Validate.inclusiveBetween(1L, 32L, (long) i); // Paper
+        this.d = j;
+        this.b = i;
+        this.a = along;
+        this.c = (1L << i) - 1L;
+        int k = MathHelper.c(j * i, 64) / 64;
+
+        if (along.length != k) {
+            throw new RuntimeException("Invalid length given for storage, got: " + along.length + " but expected: " + k);
+        }
+    }
+
+    public void a(int i, int j) {
+        //Validate.inclusiveBetween(0L, (long) (this.d - 1), (long) i); // Paper
+        //Validate.inclusiveBetween(0L, this.c, (long) j); // Paper
+        int k = i * this.b;
+        int l = k / 64;
+        int i1 = ((i + 1) * this.b - 1) / 64;
+        int j1 = k % 64;
+
+        this.a[l] = this.a[l] & ~(this.c << j1) | ((long) j & this.c) << j1;
+        if (l != i1) {
+            int k1 = 64 - j1;
+            int l1 = this.b - k1;
+
+            this.a[i1] = this.a[i1] >>> l1 << l1 | ((long) j & this.c) >> k1;
+        }
+
+    }
+
+    public int a(int i) {
+        //Validate.inclusiveBetween(0L, (long) (this.d - 1), (long) i); // Paper
+        int j = i * this.b;
+        int k = j / 64;
+        int l = ((i + 1) * this.b - 1) / 64;
+        int i1 = j % 64;
+
+        if (k == l) {
+            return (int) (this.a[k] >>> i1 & this.c);
+        } else {
+            int j1 = 64 - i1;
+
+            return (int) ((this.a[k] >>> i1 | this.a[l] << j1) & this.c);
+        }
+    }
+
+    public long[] getDataBits() { return this.a(); } // Paper - OBFHELPER
+    public long[] a() {
+        return this.a;
+    }
+
+    public int b() {
+        return this.d;
+    }
+
+    public int c() {
+        return this.b;
+    }
+}