init_ack_chunk.h - mozsearch

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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_INIT_ACK_CHUNK_H_

#define NET_DCSCTP_PACKET_CHUNK_INIT_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/parameter.h"

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

namespace dcsctp {

// https://tools.ietf.org/html/rfc4960#section-3.3.3

struct InitAckChunkConfig : ChunkConfig {

  static constexpr int kType = 2;

  static constexpr size_t kHeaderSize = 20;

  static constexpr size_t kVariableLengthAlignment = 1;

};

class InitAckChunk : public Chunk, public TLVTrait<InitAckChunkConfig> {

 public:

  static constexpr int kType = InitAckChunkConfig::kType;

  InitAckChunk(VerificationTag initiate_tag,

               uint32_t a_rwnd,

               uint16_t nbr_outbound_streams,

               uint16_t nbr_inbound_streams,

               TSN initial_tsn,

               Parameters parameters)

      : initiate_tag_(initiate_tag),

        a_rwnd_(a_rwnd),

        nbr_outbound_streams_(nbr_outbound_streams),

        nbr_inbound_streams_(nbr_inbound_streams),

        initial_tsn_(initial_tsn),

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

  InitAckChunk(InitAckChunk&& other) = default;

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

  static std::optional<InitAckChunk> Parse(rtc::ArrayView<const uint8_t> data);

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

  std::string ToString() const override;

  VerificationTag initiate_tag() const { return initiate_tag_; }

  uint32_t a_rwnd() const { return a_rwnd_; }

  uint16_t nbr_outbound_streams() const { return nbr_outbound_streams_; }

  uint16_t nbr_inbound_streams() const { return nbr_inbound_streams_; }

  TSN initial_tsn() const { return initial_tsn_; }

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

 private:

  VerificationTag initiate_tag_;

  uint32_t a_rwnd_;

  uint16_t nbr_outbound_streams_;

  uint16_t nbr_inbound_streams_;

  TSN initial_tsn_;

  Parameters parameters_;

};

}  // namespace dcsctp

#endif  // NET_DCSCTP_PACKET_CHUNK_INIT_ACK_CHUNK_H_