From c88bb483e5104872c4492f006b107625f9c91939 Mon Sep 17 00:00:00 2001
From: Agaricus <agaricusb@yahoo.com>
Date: Sun, 13 Jan 2013 03:41:38 -0800
Subject: [PATCH] Add OldChunkLoader from mc-dev for diff visibility

---
 .../java/net/minecraft/server/OldChunkLoader.java  | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/main/java/net/minecraft/server/OldChunkLoader.java

diff --git a/src/main/java/net/minecraft/server/OldChunkLoader.java b/src/main/java/net/minecraft/server/OldChunkLoader.java
new file mode 100644
index 0000000..65b0b70
--- /dev/null
+++ b/src/main/java/net/minecraft/server/OldChunkLoader.java
@@ -0,0 +1,120 @@
+package net.minecraft.server;
+
+public class OldChunkLoader {
+
+    public static OldChunk a(NBTTagCompound nbttagcompound) {
+        int i = nbttagcompound.getInt("xPos");
+        int j = nbttagcompound.getInt("zPos");
+        OldChunk oldchunk = new OldChunk(i, j);
+
+        oldchunk.g = nbttagcompound.getByteArray("Blocks");
+        oldchunk.f = new OldNibbleArray(nbttagcompound.getByteArray("Data"), 7);
+        oldchunk.e = new OldNibbleArray(nbttagcompound.getByteArray("SkyLight"), 7);
+        oldchunk.d = new OldNibbleArray(nbttagcompound.getByteArray("BlockLight"), 7);
+        oldchunk.c = nbttagcompound.getByteArray("HeightMap");
+        oldchunk.b = nbttagcompound.getBoolean("TerrainPopulated");
+        oldchunk.h = nbttagcompound.getList("Entities");
+        oldchunk.i = nbttagcompound.getList("TileEntities");
+        oldchunk.j = nbttagcompound.getList("TileTicks");
+
+        try {
+            oldchunk.a = nbttagcompound.getLong("LastUpdate");
+        } catch (ClassCastException classcastexception) {
+            oldchunk.a = (long) nbttagcompound.getInt("LastUpdate");
+        }
+
+        return oldchunk;
+    }
+
+    public static void a(OldChunk oldchunk, NBTTagCompound nbttagcompound, WorldChunkManager worldchunkmanager) {
+        nbttagcompound.setInt("xPos", oldchunk.k);
+        nbttagcompound.setInt("zPos", oldchunk.l);
+        nbttagcompound.setLong("LastUpdate", oldchunk.a);
+        int[] aint = new int[oldchunk.c.length];
+
+        for (int i = 0; i < oldchunk.c.length; ++i) {
+            aint[i] = oldchunk.c[i];
+        }
+
+        nbttagcompound.setIntArray("HeightMap", aint);
+        nbttagcompound.setBoolean("TerrainPopulated", oldchunk.b);
+        NBTTagList nbttaglist = new NBTTagList("Sections");
+
+        int j;
+
+        for (int k = 0; k < 8; ++k) {
+            boolean flag = true;
+
+            for (j = 0; j < 16 && flag; ++j) {
+                int l = 0;
+
+                while (l < 16 && flag) {
+                    int i1 = 0;
+
+                    while (true) {
+                        if (i1 < 16) {
+                            int j1 = j << 11 | i1 << 7 | l + (k << 4);
+                            byte b0 = oldchunk.g[j1];
+
+                            if (b0 == 0) {
+                                ++i1;
+                                continue;
+                            }
+
+                            flag = false;
+                        }
+
+                        ++l;
+                        break;
+                    }
+                }
+            }
+
+            if (!flag) {
+                byte[] abyte = new byte[4096];
+                NibbleArray nibblearray = new NibbleArray(abyte.length, 4);
+                NibbleArray nibblearray1 = new NibbleArray(abyte.length, 4);
+                NibbleArray nibblearray2 = new NibbleArray(abyte.length, 4);
+
+                for (int k1 = 0; k1 < 16; ++k1) {
+                    for (int l1 = 0; l1 < 16; ++l1) {
+                        for (int i2 = 0; i2 < 16; ++i2) {
+                            int j2 = k1 << 11 | i2 << 7 | l1 + (k << 4);
+                            byte b1 = oldchunk.g[j2];
+
+                            abyte[l1 << 8 | i2 << 4 | k1] = (byte) (b1 & 255);
+                            nibblearray.a(k1, l1, i2, oldchunk.f.a(k1, l1 + (k << 4), i2));
+                            nibblearray1.a(k1, l1, i2, oldchunk.e.a(k1, l1 + (k << 4), i2));
+                            nibblearray2.a(k1, l1, i2, oldchunk.d.a(k1, l1 + (k << 4), i2));
+                        }
+                    }
+                }
+
+                NBTTagCompound nbttagcompound1 = new NBTTagCompound();
+
+                nbttagcompound1.setByte("Y", (byte) (k & 255));
+                nbttagcompound1.setByteArray("Blocks", abyte);
+                nbttagcompound1.setByteArray("Data", nibblearray.a);
+                nbttagcompound1.setByteArray("SkyLight", nibblearray1.a);
+                nbttagcompound1.setByteArray("BlockLight", nibblearray2.a);
+                nbttaglist.add(nbttagcompound1);
+            }
+        }
+
+        nbttagcompound.set("Sections", nbttaglist);
+        byte[] abyte1 = new byte[256];
+
+        for (int k2 = 0; k2 < 16; ++k2) {
+            for (j = 0; j < 16; ++j) {
+                abyte1[j << 4 | k2] = (byte) (worldchunkmanager.getBiome(oldchunk.k << 4 | k2, oldchunk.l << 4 | j).id & 255);
+            }
+        }
+
+        nbttagcompound.setByteArray("Biomes", abyte1);
+        nbttagcompound.set("Entities", oldchunk.h);
+        nbttagcompound.set("TileEntities", oldchunk.i);
+        if (oldchunk.j != null) {
+            nbttagcompound.set("TileTicks", oldchunk.j);
+        }
+    }
+}
\ No newline at end of file
-- 
1.8.1-rc2