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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CAST_SENDER_CHANNEL_CAST_FRAMER_H_
#define CAST_SENDER_CHANNEL_CAST_FRAMER_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <string>
#include "absl/types/span.h"
#include "platform/base/error.h"
namespace cast {
namespace channel {
class CastMessage;
using openscreen::ErrorOr;
// Class for constructing and parsing CastMessage packet data.
class MessageFramer {
public:
// Serializes |message_proto| into |message_data|.
// Returns true if the message was serialized successfully, false otherwise.
static ErrorOr<std::string> Serialize(const CastMessage& message);
explicit MessageFramer(absl::Span<uint8_t> input_buffer);
~MessageFramer();
// The number of bytes required from the next |input_buffer| passed to
// TryDeserialize to complete the CastMessage being read. Returns zero if
// there has been a parsing error.
ErrorOr<size_t> BytesRequested() const;
// Reads bytes from |input_buffer_| and returns a new CastMessage if one is
// fully read.
//
// |byte_count| Number of additional bytes available in |input_buffer_|.
// Returns a pointer to a parsed CastMessage if a message was received in its
// entirety, empty unique_ptr if parsing was successful but didn't produce a
// complete message, and an error otherwise.
ErrorOr<CastMessage> TryDeserialize(size_t byte_count);
private:
// Total size of the message received so far in bytes (head + body).
size_t message_bytes_received_ = 0;
// Data buffer wherein the caller should place message data for ingest.
absl::Span<uint8_t> input_buffer_;
};
} // namespace channel
} // namespace cast
#endif // CAST_SENDER_CHANNEL_CAST_FRAMER_H_
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