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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.
*/
#include "net/dcsctp/packet/parameter/outgoing_ssn_reset_request_parameter.h"
#include <stddef.h>
#include <cstdint>
#include <string>
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "net/dcsctp/common/internal_types.h"
#include "net/dcsctp/packet/bounded_byte_reader.h"
#include "net/dcsctp/packet/bounded_byte_writer.h"
#include "net/dcsctp/packet/tlv_trait.h"
#include "net/dcsctp/public/types.h"
#include "rtc_base/strings/string_builder.h"
namespace dcsctp {
// https://tools.ietf.org/html/rfc6525#section-4.1
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Parameter Type = 13 | Parameter Length = 16 + 2 * N |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Re-configuration Request Sequence Number |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Re-configuration Response Sequence Number |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Sender's Last Assigned TSN |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Stream Number 1 (optional) | Stream Number 2 (optional) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// / ...... /
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Stream Number N-1 (optional) | Stream Number N (optional) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
constexpr int OutgoingSSNResetRequestParameter::kType;
absl::optional<OutgoingSSNResetRequestParameter>
OutgoingSSNResetRequestParameter::Parse(rtc::ArrayView<const uint8_t> data) {
absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
if (!reader.has_value()) {
return absl::nullopt;
}
ReconfigRequestSN request_sequence_number(reader->Load32<4>());
ReconfigRequestSN response_sequence_number(reader->Load32<8>());
TSN sender_last_assigned_tsn(reader->Load32<12>());
size_t stream_count = reader->variable_data_size() / kStreamIdSize;
std::vector<StreamID> stream_ids;
stream_ids.reserve(stream_count);
for (size_t i = 0; i < stream_count; ++i) {
BoundedByteReader<kStreamIdSize> sub_reader =
reader->sub_reader<kStreamIdSize>(i * kStreamIdSize);
stream_ids.push_back(StreamID(sub_reader.Load16<0>()));
}
return OutgoingSSNResetRequestParameter(
request_sequence_number, response_sequence_number,
sender_last_assigned_tsn, std::move(stream_ids));
}
void OutgoingSSNResetRequestParameter::SerializeTo(
std::vector<uint8_t>& out) const {
size_t variable_size = stream_ids_.size() * kStreamIdSize;
BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, variable_size);
writer.Store32<4>(*request_sequence_number_);
writer.Store32<8>(*response_sequence_number_);
writer.Store32<12>(*sender_last_assigned_tsn_);
for (size_t i = 0; i < stream_ids_.size(); ++i) {
BoundedByteWriter<kStreamIdSize> sub_writer =
writer.sub_writer<kStreamIdSize>(i * kStreamIdSize);
sub_writer.Store16<0>(*stream_ids_[i]);
}
}
std::string OutgoingSSNResetRequestParameter::ToString() const {
rtc::StringBuilder sb;
sb << "Outgoing SSN Reset Request, req_seq_nbr=" << *request_sequence_number()
<< ", resp_seq_nbr=" << *response_sequence_number()
<< ", sender_last_asg_tsn=" << *sender_last_assigned_tsn();
return sb.Release();
}
} // namespace dcsctp
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