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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.
*/
#ifndef NET_DCSCTP_PACKET_CHUNK_SACK_CHUNK_H_
#define NET_DCSCTP_PACKET_CHUNK_SACK_CHUNK_H_
#include <stddef.h>
#include <cstdint>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "net/dcsctp/packet/chunk/chunk.h"
#include "net/dcsctp/packet/tlv_trait.h"
namespace dcsctp {
// https://tools.ietf.org/html/rfc4960#section-3.3.4
struct SackChunkConfig : ChunkConfig {
static constexpr int kType = 3;
static constexpr size_t kHeaderSize = 16;
static constexpr size_t kVariableLengthAlignment = 4;
};
class SackChunk : public Chunk, public TLVTrait<SackChunkConfig> {
public:
static constexpr int kType = SackChunkConfig::kType;
struct GapAckBlock {
GapAckBlock(uint16_t start, uint16_t end) : start(start), end(end) {}
uint16_t start;
uint16_t end;
bool operator==(const GapAckBlock& other) const {
return start == other.start && end == other.end;
}
};
SackChunk(TSN cumulative_tsn_ack,
uint32_t a_rwnd,
std::vector<GapAckBlock> gap_ack_blocks,
std::set<TSN> duplicate_tsns)
: cumulative_tsn_ack_(cumulative_tsn_ack),
a_rwnd_(a_rwnd),
gap_ack_blocks_(std::move(gap_ack_blocks)),
duplicate_tsns_(std::move(duplicate_tsns)) {}
static absl::optional<SackChunk> Parse(rtc::ArrayView<const uint8_t> data);
void SerializeTo(std::vector<uint8_t>& out) const override;
std::string ToString() const override;
TSN cumulative_tsn_ack() const { return cumulative_tsn_ack_; }
uint32_t a_rwnd() const { return a_rwnd_; }
rtc::ArrayView<const GapAckBlock> gap_ack_blocks() const {
return gap_ack_blocks_;
}
const std::set<TSN>& duplicate_tsns() const { return duplicate_tsns_; }
private:
static constexpr size_t kGapAckBlockSize = 4;
static constexpr size_t kDupTsnBlockSize = 4;
const TSN cumulative_tsn_ack_;
const uint32_t a_rwnd_;
std::vector<GapAckBlock> gap_ack_blocks_;
std::set<TSN> duplicate_tsns_;
};
} // namespace dcsctp
#endif // NET_DCSCTP_PACKET_CHUNK_SACK_CHUNK_H_
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