//    Copyright (C) 2012-2020 OpenVPN Inc.

// Base class for generic link objects.

#include <openvpn/buffer/buffer.hpp>
#include <openvpn/common/rc.hpp>

#pragma once

namespace openvpn
{
  namespace TCPTransport
  {
    struct PacketFrom
    {
      typedef std::unique_ptr<PacketFrom> SPtr;
      BufferAllocated buf;
    };

    class LinkBase : public RC<thread_unsafe_refcount>
    {
    protected:
      virtual void recv_buffer(PacketFrom::SPtr& pfp,
			       const size_t bytes_recvd) = 0;
      virtual void from_app_send_buffer(BufferPtr& buf) = 0;

    public:
      typedef RCPtr<LinkBase> Ptr;

      virtual bool send_queue_empty() const = 0;
      virtual unsigned int send_queue_size() const = 0;
      virtual void reset_align_adjust(const size_t align_adjust) = 0;
      virtual bool send(BufferAllocated& b) = 0;
      virtual void set_raw_mode(const bool mode) = 0;
      virtual void start() = 0;
      virtual void stop() = 0;
    };
  }
}