Try to decode multiple packets at once

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftVarintFrameDecoder.java

@@ -11,33 +11,31 @@ public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
 
   @Override
   protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
-    if (!in.isReadable()) {
-      return;
-    }
-
-    int origReaderIndex = in.readerIndex();
-    for (int i = 0; i < 3; i++) {
-      if (!in.isReadable()) {
-        in.readerIndex(origReaderIndex);
-        return;
-      }
-
-      byte read = in.readByte();
-      if (read >= 0) {
-        // Make sure reader index of length buffer is returned to the beginning
-        in.readerIndex(origReaderIndex);
-        int packetLength = ProtocolUtils.readVarInt(in);
-
-        if (in.readableBytes() >= packetLength) {
-          out.add(in.readRetainedSlice(packetLength));
-        } else {
+    read_lens: while (in.isReadable()) {
+      int origReaderIndex = in.readerIndex();
+      for (int i = 0; i < 3; i++) {
+        if (!in.isReadable()) {
           in.readerIndex(origReaderIndex);
+          return;
         }
 
-        return;
-      }
-    }
+        byte read = in.readByte();
+        if (read >= 0) {
+          // Make sure reader index of length buffer is returned to the beginning
+          in.readerIndex(origReaderIndex);
+          int packetLength = ProtocolUtils.readVarInt(in);
 
-    throw new CorruptedFrameException("VarInt too big");
+          if (in.readableBytes() >= packetLength) {
+            out.add(in.readRetainedSlice(packetLength));
+            continue read_lens;
+          } else {
+            in.readerIndex(origReaderIndex);
+            return;
+          }
+        }
+      }
+
+      throw new CorruptedFrameException("VarInt too big");
+    }
   }
 }