Don't pass our CaptureInputStream to the "get player identity" function

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/ReadPacketModifier.java

@@ -19,7 +19,6 @@ package com.comphenix.protocol.injector.packet;
 
 import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
-import java.io.InputStream;
 import java.lang.reflect.Method;
 import java.util.Map;
 
@@ -51,7 +50,7 @@ class ReadPacketModifier implements MethodInterceptor {
 	
 	// Whether or not a packet has been cancelled
 	private static Map<Object, Object> override = new MapMaker().weakKeys().makeMap();
-	
+
 	public ReadPacketModifier(int packetID, ProxyPacketInjector packetInjector, ErrorReporter reporter, boolean isReadPacketDataMethod) {
 		this.packetID = packetID;
 		this.packetInjector = packetInjector;
@@ -91,15 +90,16 @@ class ReadPacketModifier implements MethodInterceptor {
 		Object overridenObject = override.get(thisObj);
 		Object returnValue = null;
 		
+		// We need this in order to get the correct player
+		DataInputStream input = isReadPacketDataMethod ? (DataInputStream) args[0] : null;
 		ByteArrayOutputStream bufferStream = null;
 		
 		// See if we need to buffer the read data
 		if (isReadPacketDataMethod && packetInjector.requireInputBuffers(packetID)) {
 			CaptureInputStream captured = new CaptureInputStream(
-				(InputStream) args[0], 
-				bufferStream = new ByteArrayOutputStream()); 
+				input, bufferStream = new ByteArrayOutputStream()); 
 			
-			// Stash it back
+			// Swap it with our custom stream
 			args[0] = new DataInputStream(captured);
 		}
 		
@@ -120,9 +120,10 @@ class ReadPacketModifier implements MethodInterceptor {
 		
 		// Is this a readPacketData method?
 		if (isReadPacketDataMethod) {
+			// Swap back custom stream
+			args[0] = input;
+			
 			try {
-				// We need this in order to get the correct player
-				DataInputStream input = (DataInputStream) args[0];
 				byte[] buffer = bufferStream != null ? bufferStream.toByteArray() : null;
 				
 				// Let the people know