1 files changed, 94 insertions, 0 deletions
diff --git a/third_party/libwebrtc/pc/sctp_utils.h b/third_party/libwebrtc/pc/sctp_utils.h
new file mode 100644
index 0000000000..868a8be826
--- /dev/null
+++ b/third_party/libwebrtc/pc/sctp_utils.h
@@ -0,0 +1,94 @@
+/*
+ *  Copyright 2013 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 PC_SCTP_UTILS_H_
+#define PC_SCTP_UTILS_H_
+
+#include <string>
+
+#include "api/data_channel_interface.h"
+#include "api/transport/data_channel_transport_interface.h"
+#include "media/base/media_channel.h"
+#include "media/sctp/sctp_transport_internal.h"
+#include "net/dcsctp/public/types.h"
+#include "rtc_base/copy_on_write_buffer.h"
+#include "rtc_base/ssl_stream_adapter.h"  // For SSLRole
+
+namespace rtc {
+class CopyOnWriteBuffer;
+}  // namespace rtc
+
+namespace webrtc {
+struct DataChannelInit;
+
+// Wraps the `uint16_t` sctp data channel stream id value and does range
+// checking. The class interface is `int` based to ease with DataChannelInit
+// compatibility and types used in `DataChannelController`'s interface. Going
+// forward, `int` compatibility won't be needed and we can either just use
+// this class or the internal dcsctp::StreamID type.
+class StreamId {
+ public:
+  StreamId() = default;
+  explicit StreamId(int id)
+      : id_(id >= cricket::kMinSctpSid && id <= cricket::kSpecMaxSctpSid
+                ? absl::optional<uint16_t>(static_cast<uint16_t>(id))
+                : absl::nullopt) {}
+  StreamId(const StreamId& sid) = default;
+  StreamId& operator=(const StreamId& sid) = default;
+
+  // Returns `true` if a valid stream id is contained, in the range of
+  // kMinSctpSid - kSpecMaxSctpSid ([0..0xffff]). Note that this
+  // is different than having `kMaxSctpSid` as the upper bound, which is
+  // the limit that is internally used by `SctpSidAllocator`. Sid values may
+  // be assigned to `StreamId` outside of `SctpSidAllocator` and have a higher
+  // id value than supplied by `SctpSidAllocator`, yet is still valid.
+  bool HasValue() const { return id_.has_value(); }
+
+  // Provided for compatibility with existing code that hasn't been updated
+  // to use `StreamId` directly. New code should not use 'int' for the stream
+  // id but rather `StreamId` directly.
+  int stream_id_int() const {
+    return id_.has_value() ? static_cast<int>(id_.value().value()) : -1;
+  }
+
+  void reset() { id_ = absl::nullopt; }
+
+  bool operator==(const StreamId& sid) const { return id_ == sid.id_; }
+  bool operator<(const StreamId& sid) const { return id_ < sid.id_; }
+  bool operator!=(const StreamId& sid) const { return !(operator==(sid)); }
+
+ private:
+  absl::optional<dcsctp::StreamID> id_;
+};
+
+// Read the message type and return true if it's an OPEN message.
+bool IsOpenMessage(const rtc::CopyOnWriteBuffer& payload);
+
+bool ParseDataChannelOpenMessage(const rtc::CopyOnWriteBuffer& payload,
+                                 std::string* label,
+                                 DataChannelInit* config);
+
+bool ParseDataChannelOpenAckMessage(const rtc::CopyOnWriteBuffer& payload);
+
+bool WriteDataChannelOpenMessage(const std::string& label,
+                                 const std::string& protocol,
+                                 absl::optional<Priority> priority,
+                                 bool ordered,
+                                 absl::optional<int> max_retransmits,
+                                 absl::optional<int> max_retransmit_time,
+                                 rtc::CopyOnWriteBuffer* payload);
+bool WriteDataChannelOpenMessage(const std::string& label,
+                                 const DataChannelInit& config,
+                                 rtc::CopyOnWriteBuffer* payload);
+void WriteDataChannelOpenAckMessage(rtc::CopyOnWriteBuffer* payload);
+
+}  // namespace webrtc
+
+#endif  // PC_SCTP_UTILS_H_