From b69eb3cb1a619cb3460967f67401dbdccb492cf3 Mon Sep 17 00:00:00 2001
From: Anuken <arnukren@gmail.com>
Date: Wed, 22 Apr 2026 13:41:41 -0400
Subject: [PATCH] Cap message block contents at 250 chars/1000 bytes (#11963)

---
 core/src/mindustry/logic/LExecutor.java                 | 2 +-
 core/src/mindustry/world/blocks/logic/MessageBlock.java | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/core/src/mindustry/logic/LExecutor.java b/core/src/mindustry/logic/LExecutor.java
index 1920a59123..e4a09874c8 100644
--- a/core/src/mindustry/logic/LExecutor.java
+++ b/core/src/mindustry/logic/LExecutor.java
@@ -1169,7 +1169,7 @@ public class LExecutor{
 
             if(target.building() instanceof MessageBuild d && d.isValid() && (exec.privileged || (d.team == exec.team && !d.block.privileged))){
                 d.message.setLength(0);
-                d.message.append(exec.textBuffer, 0, Math.min(exec.textBuffer.length(), maxTextBuffer));
+                d.message.append(exec.textBuffer, 0, Math.min(exec.textBuffer.length(), ((MessageBlock)d.block).maxTextLength));
             }
             exec.textBuffer.setLength(0);
 
diff --git a/core/src/mindustry/world/blocks/logic/MessageBlock.java b/core/src/mindustry/world/blocks/logic/MessageBlock.java
index 201dff6cf6..5488750d2f 100644
--- a/core/src/mindustry/world/blocks/logic/MessageBlock.java
+++ b/core/src/mindustry/world/blocks/logic/MessageBlock.java
@@ -15,6 +15,7 @@ import arc.util.pooling.*;
 import mindustry.core.*;
 import mindustry.gen.*;
 import mindustry.logic.*;
+import mindustry.mod.*;
 import mindustry.ui.*;
 import mindustry.ui.dialogs.*;
 import mindustry.world.*;
@@ -23,8 +24,10 @@ import mindustry.world.meta.*;
 import static mindustry.Vars.*;
 
 public class MessageBlock extends Block{
-    //don't change this too much unless you want to run into issues with packet sizes
-    public int maxTextLength = 300;
+    private static final int maxByteLength = 999;
+    //maximum UTF-8 length per char is 4, so 4*250 = 1000 bytes, the max byte array size
+    @NoPatch
+    public int maxTextLength = 250;
     public int maxNewlines = 24;
 
     public MessageBlock(String name){