From b99c39095d67ff617ddbb29c4ca3c6673a52b3b9 Mon Sep 17 00:00:00 2001
From: Alfie Cleveland <alfeh@me.com>
Date: Sat, 1 Jul 2017 05:10:06 +0100
Subject: [PATCH] Reduce IO ops opening a new RegionFile


diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
index 3a1bd5b8f..056504aea 100644
--- a/src/main/java/net/minecraft/server/RegionFile.java
+++ b/src/main/java/net/minecraft/server/RegionFile.java
@@ -4,9 +4,12 @@ import java.io.BufferedInputStream;
 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
+import java.io.EOFException;
 import java.io.File;
 import java.io.IOException;
 import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
 import java.util.ArrayList;
 import java.util.zip.DeflaterOutputStream;
 import java.util.zip.GZIPInputStream;
@@ -84,8 +87,16 @@ public class RegionFile {
 
             int k;
 
+            // MineHQ start
+            ByteBuffer header = ByteBuffer.allocate(8192);
+            while (header.hasRemaining())  {
+                if (this.c.getChannel().read(header) == -1) throw new EOFException();
+            }
+            header.clear();
+            IntBuffer headerAsInts = header.asIntBuffer();
+            // MineHQ end
             for (j = 0; j < 1024; ++j) {
-                k = this.c.readInt();
+                k = headerAsInts.get(); // MineHQ
                 this.d[j] = k;
                 if (k != 0 && (k >> 8) + (k & 255) <= this.f.size()) {
                     for (int l = 0; l < (k & 255); ++l) {
@@ -95,7 +106,7 @@ public class RegionFile {
             }
 
             for (j = 0; j < 1024; ++j) {
-                k = this.c.readInt();
+                k = headerAsInts.get(); // MineHQ
                 this.e[j] = k;
             }
         } catch (IOException ioexception) {
-- 
2.13.3