Revert of [cast_channel] Move cast_channel related files from //extensions to //components

components/cast_channel/cast_framer.h

-// Copyright 2014 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 COMPONENTS_CAST_CHANNEL_CAST_FRAMER_H_
-#define COMPONENTS_CAST_CHANNEL_CAST_FRAMER_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "components/cast_channel/cast_channel_enum.h"
-#include "net/base/io_buffer.h"
-
-namespace cast_channel {
-class CastMessage;
-
-// Class for constructing and parsing CastMessage packet data.
-class MessageFramer {
- public:
-  using ChannelError = ::cast_channel::ChannelError;
-
-  // |input_buffer|: The input buffer used by all socket read operations that
-  //                 feed data into the framer.
-  explicit MessageFramer(scoped_refptr<net::GrowableIOBuffer> input_buffer);
-  ~MessageFramer();
-
-  // The number of bytes required from |input_buffer| to complete the
-  // CastMessage being read.
-  // Returns zero if |error_| is true (framer is in an invalid state.)
-  size_t BytesRequested();
-
-  // Serializes |message_proto| into |message_data|.
-  // Returns true if the message was serialized successfully, false otherwise.
-  static bool Serialize(const CastMessage& message_proto,
-                        std::string* message_data);
-
-  // Reads bytes from |input_buffer_| and returns a new CastMessage if one
-  // is fully read.
-  //
-  // |num_bytes| The number of bytes received by a read operation.
-  //             Value must be <= BytesRequested().
-  // |message_length| Size of the deserialized message object, in bytes. For
-  //                  logging purposes. Set to zero if no message was parsed.
-  // |error| The result of the ingest operation. Set to CHANNEL_ERROR_NONE
-  //         if no error occurred.
-  // Returns A pointer to a parsed CastMessage if a message was received
-  //         in its entirety, nullptr otherwise.
-  std::unique_ptr<CastMessage> Ingest(size_t num_bytes,
-                                      size_t* message_length,
-                                      ChannelError* error);
-
-  // Message header struct. If fields are added, be sure to update
-  // header_size().  Public to allow use of *_size() methods in unit tests.
-  struct MessageHeader {
-    MessageHeader();
-    // Sets the message size.
-    void SetMessageSize(size_t message_size);
-    // Prepends this header to |str|.
-    void PrependToString(std::string* str);
-    // Reads |header| from the bytes specified by |data|.
-    static void Deserialize(char* data, MessageHeader* header);
-    // Size (in bytes) of the message header.
-    static size_t header_size();
-    // Maximum size (in bytes) of a message payload on the wire (does not
-    // include header).
-    static size_t max_message_size();
-    std::string ToString();
-    // The size of the following protocol message in bytes, in host byte order.
-    size_t message_size;
-  };
-
- private:
-  enum MessageElement { HEADER, BODY };
-
-  // Prepares the framer for ingesting a new message.
-  void Reset();
-
-  // The element of the message that will be read on the next call to Ingest().
-  MessageElement current_element_;
-
-  // Total size of the message, in bytes (head + body).
-  size_t message_bytes_received_;
-
-  // Size of the body alone, in bytes.
-  size_t body_size_;
-
-  // Input buffer which carries message data read from the socket.
-  // Caller is responsible for writing into this buffer.
-  scoped_refptr<net::GrowableIOBuffer> input_buffer_;
-
-  // Disables Ingest functionality is the parser receives invalid data.
-  bool error_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessageFramer);
-};
-}  // namespace cast_channel
-#endif  // COMPONENTS_CAST_CHANNEL_CAST_FRAMER_H_