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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams.h | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams.h')
-rw-r--r-- | third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams.h b/third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams.h new file mode 100644 index 0000000000..4825afd1ba --- /dev/null +++ b/third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams.h @@ -0,0 +1,122 @@ +/* + * 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_RX_TRADITIONAL_REASSEMBLY_STREAMS_H_ +#define NET_DCSCTP_RX_TRADITIONAL_REASSEMBLY_STREAMS_H_ +#include <stddef.h> +#include <stdint.h> + +#include <map> +#include <string> + +#include "absl/strings/string_view.h" +#include "api/array_view.h" +#include "net/dcsctp/common/sequence_numbers.h" +#include "net/dcsctp/packet/chunk/forward_tsn_common.h" +#include "net/dcsctp/packet/data.h" +#include "net/dcsctp/rx/reassembly_streams.h" + +namespace dcsctp { + +// Handles reassembly of incoming data when interleaved message sending +// is not enabled on the association, i.e. when RFC8260 is not in use and +// RFC4960 is to be followed. +class TraditionalReassemblyStreams : public ReassemblyStreams { + public: + TraditionalReassemblyStreams(absl::string_view log_prefix, + OnAssembledMessage on_assembled_message); + + int Add(UnwrappedTSN tsn, Data data) override; + + size_t HandleForwardTsn( + UnwrappedTSN new_cumulative_ack_tsn, + rtc::ArrayView<const AnyForwardTsnChunk::SkippedStream> skipped_streams) + override; + + void ResetStreams(rtc::ArrayView<const StreamID> stream_ids) override; + + HandoverReadinessStatus GetHandoverReadiness() const override; + void AddHandoverState(DcSctpSocketHandoverState& state) override; + void RestoreFromState(const DcSctpSocketHandoverState& state) override; + + private: + using ChunkMap = std::map<UnwrappedTSN, Data>; + + // Base class for `UnorderedStream` and `OrderedStream`. + class StreamBase { + protected: + explicit StreamBase(TraditionalReassemblyStreams* parent) + : parent_(*parent) {} + + size_t AssembleMessage(ChunkMap::iterator start, ChunkMap::iterator end); + TraditionalReassemblyStreams& parent_; + }; + + // Manages all received data for a specific unordered stream, and assembles + // messages when possible. + class UnorderedStream : StreamBase { + public: + explicit UnorderedStream(TraditionalReassemblyStreams* parent) + : StreamBase(parent) {} + int Add(UnwrappedTSN tsn, Data data); + // Returns the number of bytes removed from the queue. + size_t EraseTo(UnwrappedTSN tsn); + bool has_unassembled_chunks() const { return !chunks_.empty(); } + + private: + // Given an iterator to any chunk within the map, try to assemble a message + // into `reassembled_messages` containing it and - if successful - erase + // those chunks from the stream chunks map. + // + // Returns the number of bytes that were assembled. + size_t TryToAssembleMessage(ChunkMap::iterator iter); + + ChunkMap chunks_; + }; + + // Manages all received data for a specific ordered stream, and assembles + // messages when possible. + class OrderedStream : StreamBase { + public: + explicit OrderedStream(TraditionalReassemblyStreams* parent, + SSN next_ssn = SSN(0)) + : StreamBase(parent), next_ssn_(ssn_unwrapper_.Unwrap(next_ssn)) {} + int Add(UnwrappedTSN tsn, Data data); + size_t EraseTo(SSN ssn); + void Reset() { + ssn_unwrapper_.Reset(); + next_ssn_ = ssn_unwrapper_.Unwrap(SSN(0)); + } + SSN next_ssn() const { return next_ssn_.Wrap(); } + bool has_unassembled_chunks() const { return !chunks_by_ssn_.empty(); } + + private: + // Try to assemble one or several messages in order from the stream. + // Returns the number of bytes assembled if a message was assembled. + size_t TryToAssembleMessage(); + size_t TryToAssembleMessages(); + // This must be an ordered container to be able to iterate in SSN order. + std::map<UnwrappedSSN, ChunkMap> chunks_by_ssn_; + UnwrappedSSN::Unwrapper ssn_unwrapper_; + UnwrappedSSN next_ssn_; + }; + + const std::string log_prefix_; + + // Callback for when a message has been assembled. + const OnAssembledMessage on_assembled_message_; + + // All unordered and ordered streams, managing not-yet-assembled data. + std::map<StreamID, UnorderedStream> unordered_streams_; + std::map<StreamID, OrderedStream> ordered_streams_; +}; + +} // namespace dcsctp + +#endif // NET_DCSCTP_RX_TRADITIONAL_REASSEMBLY_STREAMS_H_ |