1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/parameter/supported_extensions_parameter.cc b/third_party/libwebrtc/net/dcsctp/packet/parameter/supported_extensions_parameter.cc
new file mode 100644
index 0000000000..6a8fb214de
--- /dev/null
+++ b/third_party/libwebrtc/net/dcsctp/packet/parameter/supported_extensions_parameter.cc
@@ -0,0 +1,65 @@
+/*
+ *  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/supported_extensions_parameter.h"
+
+#include <cstdint>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "net/dcsctp/common/str_join.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/rfc5061#section-4.2.7
+
+//   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 = 0x8008   |      Parameter Length         |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  | CHUNK TYPE 1  |  CHUNK TYPE 2 |  CHUNK TYPE 3 |  CHUNK TYPE 4 |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |                             ....                              |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  | CHUNK TYPE N  |      PAD      |      PAD      |      PAD      |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+constexpr int SupportedExtensionsParameter::kType;
+
+absl::optional<SupportedExtensionsParameter>
+SupportedExtensionsParameter::Parse(rtc::ArrayView<const uint8_t> data) {
+  absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
+  if (!reader.has_value()) {
+    return absl::nullopt;
+  }
+
+  std::vector<uint8_t> chunk_types(reader->variable_data().begin(),
+                                   reader->variable_data().end());
+  return SupportedExtensionsParameter(std::move(chunk_types));
+}
+
+void SupportedExtensionsParameter::SerializeTo(
+    std::vector<uint8_t>& out) const {
+  BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, chunk_types_.size());
+  writer.CopyToVariableData(chunk_types_);
+}
+
+std::string SupportedExtensionsParameter::ToString() const {
+  rtc::StringBuilder sb;
+  sb << "Supported Extensions (" << StrJoin(chunk_types_, ", ") << ")";
+  return sb.Release();
+}
+}  // namespace dcsctp