1 files changed, 90 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/error_cause/missing_mandatory_parameter_cause.cc b/third_party/libwebrtc/net/dcsctp/packet/error_cause/missing_mandatory_parameter_cause.cc
new file mode 100644
index 0000000000..b89f86e43e
--- /dev/null
+++ b/third_party/libwebrtc/net/dcsctp/packet/error_cause/missing_mandatory_parameter_cause.cc
@@ -0,0 +1,90 @@
+/*
+ *  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/error_cause/missing_mandatory_parameter_cause.h"
+
+#include <stddef.h>
+
+#include <cstdint>
+#include <string>
+#include <type_traits>
+#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/logging.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace dcsctp {
+
+// https://tools.ietf.org/html/rfc4960#section-3.3.10.2
+
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |     Cause Code=2              |      Cause Length=8+N*2       |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |                   Number of missing params=N                  |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |   Missing Param Type #1       |   Missing Param Type #2       |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |   Missing Param Type #N-1     |   Missing Param Type #N       |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+constexpr int MissingMandatoryParameterCause::kType;
+
+absl::optional<MissingMandatoryParameterCause>
+MissingMandatoryParameterCause::Parse(rtc::ArrayView<const uint8_t> data) {
+  absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data);
+  if (!reader.has_value()) {
+    return absl::nullopt;
+  }
+
+  uint32_t count = reader->Load32<4>();
+  if (reader->variable_data_size() / kMissingParameterSize != count) {
+    RTC_DLOG(LS_WARNING) << "Invalid number of missing parameters";
+    return absl::nullopt;
+  }
+
+  std::vector<uint16_t> missing_parameter_types;
+  missing_parameter_types.reserve(count);
+  for (uint32_t i = 0; i < count; ++i) {
+    BoundedByteReader<kMissingParameterSize> sub_reader =
+        reader->sub_reader<kMissingParameterSize>(i * kMissingParameterSize);
+
+    missing_parameter_types.push_back(sub_reader.Load16<0>());
+  }
+  return MissingMandatoryParameterCause(missing_parameter_types);
+}
+
+void MissingMandatoryParameterCause::SerializeTo(
+    std::vector<uint8_t>& out) const {
+  size_t variable_size =
+      missing_parameter_types_.size() * kMissingParameterSize;
+  BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, variable_size);
+
+  writer.Store32<4>(missing_parameter_types_.size());
+
+  for (size_t i = 0; i < missing_parameter_types_.size(); ++i) {
+    BoundedByteWriter<kMissingParameterSize> sub_writer =
+        writer.sub_writer<kMissingParameterSize>(i * kMissingParameterSize);
+
+    sub_writer.Store16<0>(missing_parameter_types_[i]);
+  }
+}
+
+std::string MissingMandatoryParameterCause::ToString() const {
+  rtc::StringBuilder sb;
+  sb << "Missing Mandatory Parameter, missing_parameter_types="
+     << StrJoin(missing_parameter_types_, ",");
+  return sb.Release();
+}
+
+}  // namespace dcsctp