Optimize Chunk Saving Memory Allocation and Compression

Minecraft ineffeciently uses OutputStreams by calling .write(int) on the stream.
For Chunks, this is a DeflaterOutputStream, which allocates a single byte EVERY write.

This is causing the server to allocate tons of new byte[1] objects.
Additionally, this is very ineffecient for the Deflate process.

By Buffering Writes the same way it already is Buffering Reads, we will
write to the stream much more effeciently.

Also a more effecient RegionFile zero'ing for new chunks to speed up
new chunk generation.

CraftBukkit-Patches/0003-Skeleton-API-Implementations.patch

@@ -1,4 +1,4 @@
-From 0eee1e3cd7129692baef76a063c7a4e62100cf86 Mon Sep 17 00:00:00 2001
+From 6e6193c0e175991dcb0e464d39c193c9aa46f27e Mon Sep 17 00:00:00 2001
 From: md_5 <md_5@live.com.au>
 Date: Sun, 2 Jun 2013 15:10:56 +1000
 Subject: [PATCH] Skeleton API Implementations

CraftBukkit-Patches/0038-Add-Getter-for-Entity-Invulnerability.patch

@@ -1,4 +1,4 @@
-From 1b3a4837aebc2072d4229c6e2d34938342620063 Mon Sep 17 00:00:00 2001
+From af0d91f09d43929fbb2cc2e49892dd1065decb39 Mon Sep 17 00:00:00 2001
 From: DerFlash <bte@freenet.de>
 Date: Sat, 3 Aug 2013 19:53:48 +1000
 Subject: [PATCH] Add Getter for Entity Invulnerability

CraftBukkit-Patches/0121-Cross-World-Entity-Teleportation.patch

@@ -1,4 +1,4 @@
-From c84e8b213d787358de30c456003e4abc570e9a32 Mon Sep 17 00:00:00 2001
+From 879e94cd8a3d63afc8defe693f08018b9a19f874 Mon Sep 17 00:00:00 2001
 From: Andrew Krieger <Slizyboy@hotmail.com>
 Date: Tue, 24 Dec 2013 07:55:23 -0800
 Subject: [PATCH] Cross World Entity Teleportation

CraftBukkit-Patches/0158-Optimize-Chunk-Saving-Memory-Allocation-and-Compress.patch

@@ -0,0 +1,33 @@
+From bec646b094570475d33dac9381e03b8ce6ba4286 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sat, 29 Aug 2015 13:59:25 -0400
+Subject: [PATCH] Optimize Chunk Saving Memory Allocation and Compression
+
+Minecraft ineffeciently uses OutputStreams by calling .write(int) on the stream.
+For Chunks, this is a DeflaterOutputStream, which allocates a single byte EVERY write.
+
+This is causing the server to allocate tons of new byte[1] objects.
+Additionally, this is very ineffecient for the Deflate process.
+
+By Buffering Writes the same way it already is Buffering Reads, we will
+write to the stream much more effeciently.
+
+diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
+index 3e31f4b..fe3fbb0 100644
+--- a/src/main/java/net/minecraft/server/RegionFile.java
++++ b/src/main/java/net/minecraft/server/RegionFile.java
+@@ -176,8 +176,9 @@ public class RegionFile {
+         }
+     }
+ 
+-    public DataOutputStream b(int i, int j) {
+-        return this.d(i, j) ? null : new DataOutputStream(new DeflaterOutputStream(new RegionFile.ChunkBuffer(i, j)));
++    public DataOutputStream b(int i, int j) { // PAIL: getChunkOutputStream
++        // PAIL: isInvalidRegion
++        return this.d(i, j) ? null : new DataOutputStream(new java.io.BufferedOutputStream(new DeflaterOutputStream(new RegionFile.ChunkBuffer(i, j)))); // Spigot - use a BufferedOutputStream to greatly improve file write performance
+     }
+ 
+     protected synchronized void a(int i, int j, byte[] abyte, int k) {
+-- 
+1.9.1
+

CraftBukkit-Patches/0159-More-effecient-RegionFile-zero-ing.patch

@@ -0,0 +1,41 @@
+From 0fe6a5f1ec7f039ee04368f5d974286b08ddb53f Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sat, 29 Aug 2015 17:48:20 -0400
+Subject: [PATCH] More effecient RegionFile zero'ing
+
+Speeds up new Chunk Generation by using 2 4k block writes vs 2048 4 byte writes
+more effecient than going in and out of native calls repeatedly.
+
+diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
+index fe3fbb0..348706f 100644
+--- a/src/main/java/net/minecraft/server/RegionFile.java
++++ b/src/main/java/net/minecraft/server/RegionFile.java
+@@ -16,7 +16,7 @@ import java.util.zip.InflaterInputStream;
+ 
+ public class RegionFile {
+ 
+-    private static final byte[] a = new byte[4096];
++    private static final byte[] a = new byte[4096]; // Spigot - note: if this ever changes to not be 4096 bytes, update constructor! // PAIL: empty 4k block
+     private final File b;
+     private RandomAccessFile c;
+     private final int[] d = new int[1024];
+@@ -38,13 +38,9 @@ public class RegionFile {
+             int i;
+ 
+             if (this.c.length() < 4096L) {
+-                for (i = 0; i < 1024; ++i) {
+-                    this.c.writeInt(0);
+-                }
+-
+-                for (i = 0; i < 1024; ++i) {
+-                    this.c.writeInt(0);
+-                }
++                // Spigot - more effecient chunk zero'ing
++                this.c.write(RegionFile.a); // Spigot
++                this.c.write(RegionFile.a); // Spigot
+ 
+                 this.g += 8192;
+             }
+-- 
+1.9.1
+