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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/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() != count * kMissingParameterSize) {
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 (size_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
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