text: /****************************************************************************
   *
   *   Copyright (c) 2020 PX4 Development Team. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name PX4 nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  #ifndef COMPONENT_INFORMATION_HPP
  #define COMPONENT_INFORMATION_HPP
  
  #include "../mavlink_stream.h"
  
  #include <component_information/checksums.h>
  
  #include <px4_platform_common/defines.h>
  
  #include <sys/stat.h>
  
  class MavlinkStreamComponentInformation : public MavlinkStream
  {
  public:
  	static MavlinkStream *new_instance(Mavlink *mavlink) { return new MavlinkStreamComponentInformation(mavlink); }
  
  	static constexpr const char *get_name_static() { return "COMPONENT_INFORMATION"; }
  	static constexpr uint16_t get_id_static() { return MAVLINK_MSG_ID_COMPONENT_INFORMATION; }
  
  	const char *get_name() const override { return get_name_static(); }
  	uint16_t get_id() override { return get_id_static(); }
  
  	unsigned get_size() override
  	{
  		return 0; // never streamed
  	}
  
  	bool request_message(float param2, float param3, float param4,
  			     float param5, float param6, float param7) override
  	{
  		mavlink_component_information_t component_info{};
  		PX4_DEBUG("COMPONENT_INFORMATION request");
  
  		strncpy(component_info.general_metadata_uri, "mftp://etc/extras/component_general.json.xz",
  			sizeof(component_info.general_metadata_uri) - 1);
  		component_info.general_metadata_file_crc = component_information::component_general_crc;
  
  		component_info.time_boot_ms = hrt_absolute_time() / 1000;
  		mavlink_msg_component_information_send_struct(_mavlink->get_channel(), &component_info);
  
  		return true;
  	}
  private:
  	explicit MavlinkStreamComponentInformation(Mavlink *mavlink) : MavlinkStream(mavlink) {}
  
  	bool send() override
  	{
  		return false;
  	}
  };
  
  #endif // COMPONENT_INFORMATION_HPP
  