1 files changed, 89 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc b/third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc
new file mode 100644
index 0000000000..6191adfe9d
--- /dev/null
+++ b/third_party/libwebrtc/net/dcsctp/packet/parameter/incoming_ssn_reset_request_parameter.cc
@@ -0,0 +1,89 @@
+/*
+ *  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/incoming_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/packet/bounded_byte_reader.h"
+#include "net/dcsctp/packet/bounded_byte_writer.h"
+#include "net/dcsctp/packet/tlv_trait.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace dcsctp {
+
+// https://tools.ietf.org/html/rfc6525#section-4.2
+
+//   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 = 14       |  Parameter Length = 8 + 2 * N |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |          Re-configuration Request Sequence Number             |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |  Stream Number 1 (optional)   |    Stream Number 2 (optional) |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  /                            ......                             /
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |  Stream Number N-1 (optional) |    Stream Number N (optional) |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+constexpr int IncomingSSNResetRequestParameter::kType;
+
+absl::optional<IncomingSSNResetRequestParameter>
+IncomingSSNResetRequestParameter::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>());
+
+  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 IncomingSSNResetRequestParameter(request_sequence_number,
+                                          std::move(stream_ids));
+}
+
+void IncomingSSNResetRequestParameter::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_);
+
+  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 IncomingSSNResetRequestParameter::ToString() const {
+  rtc::StringBuilder sb;
+  sb << "Incoming SSN Reset Request, req_seq_nbr="
+     << *request_sequence_number();
+  return sb.Release();
+}
+
+}  // namespace dcsctp