Fix mapping of ChunkSection nibble data to snapshot. Fixes BUKKIT-1977

src/main/java/org/bukkit/craftbukkit/CraftChunk.java

@@ -183,8 +183,8 @@ public class CraftChunk implements Chunk {
                             continue;
                         }
 
-                        blockids[j<<1] |= (b & 0xF0) << 4;
-                        blockids[(j<<1)+1] |= (b & 0x0F) << 8;
+                        blockids[j<<1] |= (b & 0x0F) << 8;
+                        blockids[(j<<1)+1] |= (b & 0xF0) << 4;
                     }
                 }
 
@@ -192,11 +192,11 @@ public class CraftChunk implements Chunk {
 
                 /* Get block data nibbles */
                 sectionBlockData[i] = new byte[2048];
-                System.arraycopy(cs[i].i().a, 0, sectionBlockData[i], 0, 2048);
+                System.arraycopy(cs[i].j().a, 0, sectionBlockData[i], 0, 2048); // Should be getData
                 sectionSkyLights[i] = new byte[2048];
-                System.arraycopy(cs[i].k().a, 0, sectionSkyLights[i], 0, 2048);
+                System.arraycopy(cs[i].l().a, 0, sectionSkyLights[i], 0, 2048); // Should be getSkyLight
                 sectionEmitLights[i] = new byte[2048];
-                System.arraycopy(cs[i].j().a, 0, sectionEmitLights[i], 0, 2048);
+                System.arraycopy(cs[i].k().a, 0, sectionEmitLights[i], 0, 2048); // Should be getBlockLight
             }
         }