mirror of
https://github.com/mollyim/webrtc.git
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0e73602a9f
Adding strong types went a little too far as these two types represent the same sequence number. A "request sequence number" is a number, that - when responded to - will be used as "response sequence number". Having them separate added confusion and just a lot of type-casting. Bug: webrtc:12614 Change-Id: I4636ea8f2252023a2d5a9b7033763e1978b1812e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214130 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33789}
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef NET_DCSCTP_PACKET_PARAMETER_RECONFIGURATION_RESPONSE_PARAMETER_H_
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#define NET_DCSCTP_PACKET_PARAMETER_RECONFIGURATION_RESPONSE_PARAMETER_H_
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#include <stddef.h>
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "absl/strings/string_view.h"
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#include "absl/types/optional.h"
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#include "api/array_view.h"
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#include "net/dcsctp/common/internal_types.h"
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#include "net/dcsctp/packet/parameter/parameter.h"
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#include "net/dcsctp/packet/tlv_trait.h"
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namespace dcsctp {
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// https://tools.ietf.org/html/rfc6525#section-4.4
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struct ReconfigurationResponseParameterConfig : ParameterConfig {
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static constexpr int kType = 16;
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static constexpr size_t kHeaderSize = 12;
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static constexpr size_t kVariableLengthAlignment = 4;
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};
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class ReconfigurationResponseParameter
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: public Parameter,
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public TLVTrait<ReconfigurationResponseParameterConfig> {
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public:
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static constexpr int kType = ReconfigurationResponseParameterConfig::kType;
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enum class Result {
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kSuccessNothingToDo = 0,
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kSuccessPerformed = 1,
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kDenied = 2,
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kErrorWrongSSN = 3,
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kErrorRequestAlreadyInProgress = 4,
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kErrorBadSequenceNumber = 5,
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kInProgress = 6,
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};
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ReconfigurationResponseParameter(ReconfigRequestSN response_sequence_number,
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Result result)
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: response_sequence_number_(response_sequence_number),
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result_(result),
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sender_next_tsn_(absl::nullopt),
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receiver_next_tsn_(absl::nullopt) {}
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explicit ReconfigurationResponseParameter(
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ReconfigRequestSN response_sequence_number,
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Result result,
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TSN sender_next_tsn,
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TSN receiver_next_tsn)
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: response_sequence_number_(response_sequence_number),
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result_(result),
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sender_next_tsn_(sender_next_tsn),
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receiver_next_tsn_(receiver_next_tsn) {}
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static absl::optional<ReconfigurationResponseParameter> Parse(
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rtc::ArrayView<const uint8_t> data);
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void SerializeTo(std::vector<uint8_t>& out) const override;
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std::string ToString() const override;
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ReconfigRequestSN response_sequence_number() const {
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return response_sequence_number_;
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}
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Result result() const { return result_; }
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absl::optional<TSN> sender_next_tsn() const { return sender_next_tsn_; }
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absl::optional<TSN> receiver_next_tsn() const { return receiver_next_tsn_; }
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private:
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static constexpr size_t kNextTsnHeaderSize = 8;
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ReconfigRequestSN response_sequence_number_;
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Result result_;
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absl::optional<TSN> sender_next_tsn_;
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absl::optional<TSN> receiver_next_tsn_;
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};
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absl::string_view ToString(ReconfigurationResponseParameter::Result result);
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} // namespace dcsctp
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#endif // NET_DCSCTP_PACKET_PARAMETER_RECONFIGURATION_RESPONSE_PARAMETER_H_
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