1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/chunk/forward_tsn_common.h b/third_party/libwebrtc/net/dcsctp/packet/chunk/forward_tsn_common.h
new file mode 100644
index 0000000000..37bd2aafff
--- /dev/null
+++ b/third_party/libwebrtc/net/dcsctp/packet/chunk/forward_tsn_common.h
@@ -0,0 +1,66 @@
+/*
+ *  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_FORWARD_TSN_COMMON_H_
+#define NET_DCSCTP_PACKET_CHUNK_FORWARD_TSN_COMMON_H_
+#include <stdint.h>
+
+#include <utility>
+#include <vector>
+
+#include "api/array_view.h"
+#include "net/dcsctp/packet/chunk/chunk.h"
+
+namespace dcsctp {
+
+// Base class for both ForwardTsnChunk and IForwardTsnChunk
+class AnyForwardTsnChunk : public Chunk {
+ public:
+  struct SkippedStream {
+    SkippedStream(StreamID stream_id, SSN ssn)
+        : stream_id(stream_id), ssn(ssn), unordered(false), message_id(0) {}
+    SkippedStream(IsUnordered unordered, StreamID stream_id, MID message_id)
+        : stream_id(stream_id),
+          ssn(0),
+          unordered(unordered),
+          message_id(message_id) {}
+
+    StreamID stream_id;
+
+    // Set for FORWARD_TSN
+    SSN ssn;
+
+    // Set for I-FORWARD_TSN
+    IsUnordered unordered;
+    MID message_id;
+
+    bool operator==(const SkippedStream& other) const {
+      return stream_id == other.stream_id && ssn == other.ssn &&
+             unordered == other.unordered && message_id == other.message_id;
+    }
+  };
+
+  AnyForwardTsnChunk(TSN new_cumulative_tsn,
+                     std::vector<SkippedStream> skipped_streams)
+      : new_cumulative_tsn_(new_cumulative_tsn),
+        skipped_streams_(std::move(skipped_streams)) {}
+
+  TSN new_cumulative_tsn() const { return new_cumulative_tsn_; }
+
+  rtc::ArrayView<const SkippedStream> skipped_streams() const {
+    return skipped_streams_;
+  }
+
+ private:
+  TSN new_cumulative_tsn_;
+  std::vector<SkippedStream> skipped_streams_;
+};
+}  // namespace dcsctp
+
+#endif  // NET_DCSCTP_PACKET_CHUNK_FORWARD_TSN_COMMON_H_