output: #fixed code
                                  public void encodePacket(Packet packet, ByteBuf buffer, ByteBufAllocator allocator, boolean binary, boolean jsonp) throws IOException {
          ByteBuf buf = buffer;
          if (!binary) {
              buf = allocateBuffer(allocator);
          }
          byte type = toChar(packet.getType().getValue());
          buf.writeByte(type);
  
          switch (packet.getType()) {
  
              case PONG: {
                  buf.writeBytes(packet.getData().toString().getBytes(CharsetUtil.UTF_8));
                  break;
              }
  
              case OPEN: {
                  ByteBufOutputStream out = new ByteBufOutputStream(buf);
                  if (jsonp) {
                      jsonSupport.writeJsonpValue(out, packet.getData());
                  } else {
                      jsonSupport.writeValue(out, packet.getData());
                  }
                  break;
              }
  
              case MESSAGE: {
                  byte subType = toChar(packet.getSubType().getValue());
                  buf.writeByte(subType);
  
                  if (packet.getSubType() == PacketType.CONNECT) {
                      if (!packet.getNsp().isEmpty()) {
                          buf.writeBytes(packet.getNsp().getBytes(CharsetUtil.UTF_8));
                      }
                  } else {
                      if (!packet.getNsp().isEmpty()) {
                          buf.writeBytes(packet.getNsp().getBytes(CharsetUtil.UTF_8));
                          buf.writeBytes(new byte[] {','});
                      }
                  }
  
                  if (packet.getAckId() != null) {
                      byte[] ackId = toChars(packet.getAckId());
                      buf.writeBytes(ackId);
                  }
  
                  List<Object> values = new ArrayList<Object>();
  
                  if (packet.getSubType() == PacketType.EVENT
                          || packet.getSubType() == PacketType.ERROR) {
                      values.add(packet.getName());
                  }
  
                  if (packet.getSubType() == PacketType.EVENT
                          || packet.getSubType() == PacketType.ACK
                              || packet.getSubType() == PacketType.ERROR) {
                      List<Object> args = packet.getData();
                      values.addAll(args);
                      ByteBufOutputStream out = new ByteBufOutputStream(buf);
                      if (jsonp) {
                          jsonSupport.writeJsonpValue(out, values);
                      } else {
                          jsonSupport.writeValue(out, values);
                      }
                  }
                  break;
              }
          }
  
          if (!binary) {
              buffer.writeByte(0);
              int length = buf.writerIndex();
              buffer.writeBytes(longToBytes(length));
              buffer.writeByte(0xff);
              buffer.writeBytes(buf);
          }
      }
input: #vulnerable code 
                                  public void encodePacket(Packet packet, ByteBuf buffer, ByteBufAllocator allocator, boolean binary, boolean jsonp) throws IOException {
          ByteBuf buf = buffer;
          if (!binary) {
              buf = allocateBuffer(allocator);
          }
          byte type = toChar(packet.getType().getValue());
          buf.writeByte(type);
  
          switch (packet.getType()) {
  
              case PONG: {
                  buf.writeBytes(packet.getData().toString().getBytes(CharsetUtil.UTF_8));
                  break;
              }
  
              case OPEN: {
                  ByteBufOutputStream out = new ByteBufOutputStream(buf);
                  if (jsonp) {
                      jsonSupport.writeJsonpValue(out, packet.getData());
                  } else {
                      jsonSupport.writeValue(out, packet.getData());
                  }
                  break;
              }
  
              case MESSAGE: {
                  byte subType = toChar(packet.getSubType().getValue());
                  buf.writeByte(subType);
  
                  if (packet.getSubType() == PacketType.CONNECT) {
                      if (!packet.getNsp().isEmpty()) {
                          buf.writeBytes(packet.getNsp().getBytes(CharsetUtil.UTF_8));
                      }
                  } else {
                      if (!packet.getNsp().isEmpty()) {
                          buf.writeBytes(packet.getNsp().getBytes(CharsetUtil.UTF_8));
                          buf.writeBytes(new byte[] {','});
                      }
                  }
  
                  if (packet.getAckId() != null) {
                      byte[] ackId = toChars(packet.getAckId());
                      buf.writeBytes(ackId);
                  }
  
                  List<Object> values = new ArrayList<Object>();
  
                  if (packet.getSubType() == PacketType.EVENT
                          || packet.getSubType() == PacketType.ERROR) {
                      values.add(packet.getName());
                  }
  
                  if (packet.getSubType() == PacketType.EVENT
                          || packet.getSubType() == PacketType.ACK
                              || packet.getSubType() == PacketType.ERROR) {
                      List<Object> args = packet.getData();
                      values.addAll(args);
                      ByteBufOutputStream out = new ByteBufOutputStream(buf);
                      if (jsonp) {
                          jsonSupport.writeJsonpValue(out, values);
                      } else {
                          if (binary) {
                              // handling websocket encoding bug
                              ByteBuf b = allocateBuffer(allocator);
                              try {
                                  ByteBufOutputStream os = new ByteBufOutputStream(b);
                                  jsonSupport.writeValue(os, values);
  
                                  CharsetEncoder enc = CharsetUtil.ISO_8859_1.newEncoder();
                                  String str = b.toString(CharsetUtil.ISO_8859_1);
                                  if (enc.canEncode(str)) {
                                      buf.writeBytes(str.getBytes(CharsetUtil.UTF_8));
                                  } else {
                                      buf.writeBytes(b);
                                  }
                              }
                              finally {
                                  b.release();
                              }
                          } else {
                              jsonSupport.writeValue(out, values);
                          }
                      }
                  }
                  break;
              }
          }
  
          if (!binary) {
              buffer.writeByte(0);
              int length = buf.writerIndex();
              buffer.writeBytes(longToBytes(length));
              buffer.writeByte(0xff);
              buffer.writeBytes(buf);
          }
      } 
                              #location 64 
                              #vulnerability type RESOURCE_LEAK