heartbeat_ack_chunk.h

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/*

 *  Copyright (c) 2021 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 NET_DCSCTP_PACKET_CHUNK_HEARTBEAT_ACK_CHUNK_H_

#define NET_DCSCTP_PACKET_CHUNK_HEARTBEAT_ACK_CHUNK_H_

#include <stddef.h>

#include <stdint.h>

#include <string>

#include <utility>

#include <vector>

#include "absl/strings/string_view.h"

#include "api/array_view.h"

#include "net/dcsctp/packet/chunk/chunk.h"

#include "net/dcsctp/packet/parameter/heartbeat_info_parameter.h"

#include "net/dcsctp/packet/parameter/parameter.h"

#include "net/dcsctp/packet/tlv_trait.h"

namespace dcsctp {

// https://tools.ietf.org/html/rfc4960#section-3.3.6

struct HeartbeatAckChunkConfig : ChunkConfig {

  static constexpr int kType = 5;

  static constexpr size_t kHeaderSize = 4;

  static constexpr size_t kVariableLengthAlignment = 1;

};

class HeartbeatAckChunk : public Chunk,

                          public TLVTrait<HeartbeatAckChunkConfig> {

 public:

  static constexpr int kType = HeartbeatAckChunkConfig::kType;

  explicit HeartbeatAckChunk(Parameters parameters)

      : parameters_(std::move(parameters)) {}

  HeartbeatAckChunk(HeartbeatAckChunk&& other) = default;

  HeartbeatAckChunk& operator=(HeartbeatAckChunk&& other) = default;

  static std::optional<HeartbeatAckChunk> Parse(

      rtc::ArrayView<const uint8_t> data);

  void SerializeTo(std::vector<uint8_t>& out) const override;

  std::string ToString() const override;

  const Parameters& parameters() const { return parameters_; }

  std::optional<HeartbeatInfoParameter> info() const {

    return parameters_.get<HeartbeatInfoParameter>();

 private:

  Parameters parameters_;

};

}  // namespace dcsctp

#endif  // NET_DCSCTP_PACKET_CHUNK_HEARTBEAT_ACK_CHUNK_H_