From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Taiyou06 <kaandindar21@gmail.com>
Date: Fri, 21 Feb 2025 15:06:55 +0100
Subject: [PATCH] Bulk writes to writeLongArray during chunk loading


diff --git a/net/minecraft/network/FriendlyByteBuf.java b/net/minecraft/network/FriendlyByteBuf.java
index abb0141426fd716e79a947b9498a8351daa342fc..5353b8331cf9c428ab7ffba6ebeac4fa323af456 100644
--- a/net/minecraft/network/FriendlyByteBuf.java
+++ b/net/minecraft/network/FriendlyByteBuf.java
@@ -341,10 +341,33 @@ public class FriendlyByteBuf extends ByteBuf {
 
     public FriendlyByteBuf writeLongArray(long[] array) {
         this.writeVarInt(array.length);
+        // Leaf start - Bulk writes to writeLongArray during chunk loading
+        if (array.length == 0) {
+            return this;
+        }
+
+        this.source.ensureWritable(array.length * Long.BYTES);
+        int writerIndex = this.source.writerIndex();
+
+        if (this.source.hasArray()) {
+            byte[] dest = this.source.array();
+            int offset = this.source.arrayOffset() + writerIndex;
 
-        for (long l : array) {
-            this.writeLong(l);
+            ByteBuffer buf = ByteBuffer.wrap(dest, offset, array.length * Long.BYTES).order(this.source.order());
+            buf.asLongBuffer().put(array);
+
+            this.source.writerIndex(writerIndex + array.length * Long.BYTES);
+        } else if (this.source.nioBufferCount() > 0) {
+            ByteBuffer nioBuf = this.source.nioBuffer(writerIndex, array.length * Long.BYTES);
+            nioBuf.asLongBuffer().put(array);
+            this.source.writerIndex(writerIndex + array.length * Long.BYTES);
+        } else {
+            ByteBuffer temp = ByteBuffer.allocate(array.length * Long.BYTES).order(this.source.order());
+            temp.asLongBuffer().put(array);
+            temp.rewind();
+            this.source.writeBytes(temp);
         }
+        // Leaf end - Bulk writes to writeLongArray during chunk loading
 
         return this;
     }