diff --git a/src/main/java/net/minecraft/server/ChunkSection.java b/src/main/java/net/minecraft/server/ChunkSection.java
new file mode 100644
index 0000000000..c96e146ee6
--- /dev/null
+++ b/src/main/java/net/minecraft/server/ChunkSection.java
@@ -0,0 +1,171 @@
+package net.minecraft.server;
+
+public class ChunkSection {
+
+    private int a;
+    private int b;
+    private int c;
+    private byte[] d;
+    private NibbleArray e;
+    private NibbleArray f;
+    private NibbleArray g;
+    private NibbleArray h;
+
+    public ChunkSection(int i) {
+        this.a = i;
+        this.d = new byte[4096];
+        this.f = new NibbleArray(this.d.length, 4);
+        this.h = new NibbleArray(this.d.length, 4);
+        this.g = new NibbleArray(this.d.length, 4);
+    }
+
+    public int a(int i, int j, int k) {
+        int l = this.d[j << 8 | k << 4 | i] & 255;
+
+        return this.e != null ? this.e.a(i, j, k) << 8 | l : l;
+    }
+
+    public void a(int i, int j, int k, int l) {
+        int i1 = this.d[j << 8 | k << 4 | i] & 255;
+
+        if (this.e != null) {
+            i1 |= this.e.a(i, j, k) << 8;
+        }
+
+        if (i1 == 0 && l != 0) {
+            ++this.b;
+            if (Block.byId[l] != null && Block.byId[l].m()) {
+                ++this.c;
+            }
+        } else if (i1 != 0 && l == 0) {
+            --this.b;
+            if (Block.byId[i1] != null && Block.byId[i1].m()) {
+                --this.c;
+            }
+        } else if (Block.byId[i1] != null && Block.byId[i1].m() && (Block.byId[l] == null || !Block.byId[l].m())) {
+            --this.c;
+        } else if ((Block.byId[i1] == null || !Block.byId[i1].m()) && Block.byId[l] != null && Block.byId[l].m()) {
+            ++this.c;
+        }
+
+        this.d[j << 8 | k << 4 | i] = (byte) (l & 255);
+        if (l > 255) {
+            if (this.e == null) {
+                this.e = new NibbleArray(this.d.length, 4);
+            }
+
+            this.e.a(i, j, k, (l & 3840) >> 8);
+        } else if (this.e != null) {
+            this.e.a(i, j, k, 0);
+        }
+    }
+
+    public int b(int i, int j, int k) {
+        return this.f.a(i, j, k);
+    }
+
+    public void b(int i, int j, int k, int l) {
+        this.f.a(i, j, k, l);
+    }
+
+    public boolean a() {
+        return this.b == 0;
+    }
+
+    public boolean b() {
+        return this.c > 0;
+    }
+
+    public int c() {
+        return this.a;
+    }
+
+    public void c(int i, int j, int k, int l) {
+        this.h.a(i, j, k, l);
+    }
+
+    public int c(int i, int j, int k) {
+        return this.h.a(i, j, k);
+    }
+
+    public void d(int i, int j, int k, int l) {
+        this.g.a(i, j, k, l);
+    }
+
+    public int d(int i, int j, int k) {
+        return this.g.a(i, j, k);
+    }
+
+    public void d() {
+        this.b = 0;
+        this.c = 0;
+
+        for (int i = 0; i < 16; ++i) {
+            for (int j = 0; j < 16; ++j) {
+                for (int k = 0; k < 16; ++k) {
+                    int l = this.a(i, j, k);
+
+                    if (l > 0) {
+                        if (Block.byId[l] == null) {
+                            this.d[j << 8 | k << 4 | i] = 0;
+                            if (this.e != null) {
+                                this.e.a(i, j, k, 0);
+                            }
+                        } else {
+                            ++this.b;
+                            if (Block.byId[l].m()) {
+                                ++this.c;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    public void e() {}
+
+    public int f() {
+        return this.b;
+    }
+
+    public byte[] g() {
+        return this.d;
+    }
+
+    public NibbleArray h() {
+        return this.e;
+    }
+
+    public NibbleArray i() {
+        return this.f;
+    }
+
+    public NibbleArray j() {
+        return this.g;
+    }
+
+    public NibbleArray k() {
+        return this.h;
+    }
+
+    public void a(byte[] abyte) {
+        this.d = abyte;
+    }
+
+    public void a(NibbleArray nibblearray) {
+        this.e = nibblearray;
+    }
+
+    public void b(NibbleArray nibblearray) {
+        this.f = nibblearray;
+    }
+
+    public void c(NibbleArray nibblearray) {
+        this.g = nibblearray;
+    }
+
+    public void d(NibbleArray nibblearray) {
+        this.h = nibblearray;
+    }
+}