/*
 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef RTC_BASE_SOCKET_ADAPTERS_H_
#define RTC_BASE_SOCKET_ADAPTERS_H_

#include <cstddef>
#include <cstdint>
#include <span>

#include "rtc_base/async_socket.h"
#include "rtc_base/socket.h"
#include "rtc_base/socket_address.h"

namespace webrtc {

///////////////////////////////////////////////////////////////////////////////

// Implements a socket adapter that can buffer and process data internally,
// as in the case of connecting to a proxy, where you must speak the proxy
// protocol before commencing normal socket behavior.
class BufferedReadAdapter : public AsyncSocketAdapter {
 public:
  BufferedReadAdapter(Socket* socket, size_t buffer_size);
  ~BufferedReadAdapter() override;

  BufferedReadAdapter(const BufferedReadAdapter&) = delete;
  BufferedReadAdapter& operator=(const BufferedReadAdapter&) = delete;

  int Send(const void* pv, size_t cb) override;
  int Recv(void* pv, size_t cb, int64_t* timestamp) override;

 protected:
  int DirectSend(const void* pv, size_t cb) {
    return AsyncSocketAdapter::Send(pv, cb);
  }

  void BufferInput(bool on = true);
  virtual void ProcessInput(char* data, size_t* len) = 0;

  void OnReadEvent(Socket* socket) override;

 private:
  char* buffer_;
  size_t buffer_size_, data_len_;
  bool buffering_;
};

///////////////////////////////////////////////////////////////////////////////

// Implements a socket adapter that performs the client side of a
// fake SSL handshake. Used for "ssltcp" P2P functionality.
class AsyncSSLSocket : public BufferedReadAdapter {
 public:
  static std::span<const uint8_t> SslClientHello();
  static std::span<const uint8_t> SslServerHello();

  explicit AsyncSSLSocket(Socket* socket);

  AsyncSSLSocket(const AsyncSSLSocket&) = delete;
  AsyncSSLSocket& operator=(const AsyncSSLSocket&) = delete;

  int Connect(const SocketAddress& addr) override;

 protected:
  void OnConnectEvent(Socket* socket) override;
  void ProcessInput(char* data, size_t* len) override;
};

}  //  namespace webrtc


#endif  // RTC_BASE_SOCKET_ADAPTERS_H_