PaperMC/CraftBukkit-Patches/0139-Apply-NBTReadLimiter-to-more-things.patch

From 9c0d9359c773ea13c2c705091101c81977ddb5a0 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Sun, 27 Jul 2014 20:46:04 +1000
Subject: [PATCH] Apply NBTReadLimiter to more things.


diff --git a/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java b/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java
index 2a04b86..b2d5254 100644
--- a/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java
+++ b/src/main/java/net/minecraft/server/NBTCompressedStreamTools.java
@@ -44,6 +44,12 @@ public class NBTCompressedStreamTools {
     }
 
     public static NBTTagCompound a(DataInput datainput, NBTReadLimiter nbtreadlimiter) throws IOException {
+        // Spigot start
+        if ( datainput instanceof io.netty.buffer.ByteBufInputStream )
+        {
+            datainput = new DataInputStream(new org.spigotmc.LimitStream((InputStream) datainput, nbtreadlimiter));
+        }
+        // Spigot end
         NBTBase nbtbase = a(datainput, 0, nbtreadlimiter);
 
         if (nbtbase instanceof NBTTagCompound) {
diff --git a/src/main/java/org/spigotmc/LimitStream.java b/src/main/java/org/spigotmc/LimitStream.java
new file mode 100644
index 0000000..dcc0548
--- /dev/null
+++ b/src/main/java/org/spigotmc/LimitStream.java
@@ -0,0 +1,39 @@
+package org.spigotmc;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import net.minecraft.server.NBTReadLimiter;
+
+public class LimitStream extends FilterInputStream
+{
+
+    private final NBTReadLimiter limit;
+
+    public LimitStream(InputStream is, NBTReadLimiter limit)
+    {
+        super( is );
+        this.limit = limit;
+    }
+
+    @Override
+    public int read() throws IOException
+    {
+        limit.a( 1 );
+        return super.read();
+    }
+
+    @Override
+    public int read(byte[] b) throws IOException
+    {
+        limit.a( b.length );
+        return super.read( b );
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException
+    {
+        limit.a( len );
+        return super.read( b, off, len );
+    }
+}
-- 
2.1.0