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/*
* 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/priority.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 webrtc {
class CopyOnWriteBuffer;
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(uint16_t id) : id_(id) {}
StreamId(const StreamId& sid) = default;
StreamId& operator=(const StreamId& sid) = default;
// 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 static_cast<int>(id_.value()); }
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:
dcsctp::StreamID id_;
};
// Read the message type and return true if it's an OPEN message.
bool IsOpenMessage(const CopyOnWriteBuffer& payload);
bool ParseDataChannelOpenMessage(const CopyOnWriteBuffer& payload,
std::string* label,
DataChannelInit* config);
bool ParseDataChannelOpenAckMessage(const CopyOnWriteBuffer& payload);
bool WriteDataChannelOpenMessage(const std::string& label,
const std::string& protocol,
std::optional<PriorityValue> priority,
bool ordered,
std::optional<int> max_retransmits,
std::optional<int> max_retransmit_time,
CopyOnWriteBuffer* payload);
bool WriteDataChannelOpenMessage(const std::string& label,
const DataChannelInit& config,
CopyOnWriteBuffer* payload);
void WriteDataChannelOpenAckMessage(CopyOnWriteBuffer* payload);
} // namespace webrtc
#endif // PC_SCTP_UTILS_H_
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