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<li class="toctree-l2"><a class="reference internal" href="../../../python/README.html">Python Reference Guide</a><ul>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/area_callback_service_runner.html">Area Callback Service Runner</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/area_callback_service_servicer.html">Area Callback Servicer</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_acquisition.html">Data Acquisition</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_acquisition_helpers.html">Data Acquisition Helpers</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_acquisition_plugin.html">Data Acquisition Plugin</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_acquisition_plugin_service.html">Data Acquisition Plugin Service</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_acquisition_store.html">Data Acquisition Store</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_buffer.html">Data Buffer</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/data_service.html">Data Service</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/estop.html">E-Stop</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/frame_helpers.html">Frame Helpers</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/graph_nav.html">Graph Nav</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/gripper_camera_param.html">Gripper Camera Params</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/image.html">Image</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/image_service_helpers.html">Image Service Helpers</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/ir_enable_disable.html">IR Enable/Disable</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/lease.html">Lease</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/lease_resource_hierarchy.html">Lease Resource Hierarchy</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/lease_validator.html">Lease Validator</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/local_grid.html">Local Grid</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/math_helpers.html">Math Helpers</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/manipulation_api_client.html">Manipulation API</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/map_processing.html">Map Processing</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/network_compute_bridge_client.html">Network Compute Bridge</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/payload_registration.html">Payload Registration</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/payload.html">Payload</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/point_cloud.html">Point Cloud</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/power.html">Power</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/processors.html">Processors</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/ray_cast.html">Ray casting</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/recording.html">Recording</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/robot_command.html">Robot Command</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/robot_id.html">Robot ID</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/robot.html">Robot</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/robot_state.html">Robot State</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/sdk.html">SDK</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/server_util.html">Server Util</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/README.html">Spot CAM</a><ul>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/audio.html">Audio</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/compositor.html">Compositor</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/health.html">Health</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/lighting.html">Lighting</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/lights_helper.html">Lights Helper</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/media_log.html">Media Log</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/network.html">Network</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/power.html">Power</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/ptz.html">PTZ</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/streamquality.html">Stream Quality</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_cam/version.html">Version</a></li>
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</li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/spot_check.html">Spot Check</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/time_sync.html">Time Sync</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/token_cache.html">Token Cache</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/token_manager.html">Token Manager</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/util.html">Util</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-client/src/bosdyn/client/world_object.html">World Object</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/README.html">Core</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/README.html">BDDF</a><ul>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/base_data_reader.html">Base Data Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/block_writer.html">Block Writer</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/bosdyn.html">BDDF Conventions</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/common.html">Common</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/data_reader.html">Data Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/data_writer.html">Data Writer</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/file_indexer.html">File Indexer</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/grpc_proto_reader.html">GRPC Proto Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/grpc_reader.html">GRPC Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/grpc_service_reader.html">GRPC Service Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/grpc_service_writer.html">GRPC Service Writer</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/message_reader.html">Message Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/pod_series_reader.html">POD Series Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/pod_series_writer.html">POD Series Writer</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/protobuf_channel_reader.html">Protobuf Channel Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/protobuf_reader.html">Protobuf Reader</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/protobuf_series_writer.html">Protobuf Series Writer</a></li>
<li class="toctree-l5"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/bddf/stream_data_reader.html">Stream Data Reader</a></li>
</ul>
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<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/geometry.html">Geometry</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-core/src/bosdyn/util.html">Util</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/README.html">Mission</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/client.html">Client</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/constants.html">Constants</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/exceptions.html">Exceptions</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/remote_client.html">Remote Client</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/server_util.html">Server Util</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-mission/src/bosdyn/mission/util.html">Util</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="../../../python/bosdyn-choreography-client/src/bosdyn/choreography/client/README.html">Choreography</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-choreography-client/src/bosdyn/choreography/client/choreography.html">Choreography</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-choreography-client/src/bosdyn/choreography/client/animation_file_to_proto.html">Animation File to Proto</a></li>
<li class="toctree-l4"><a class="reference internal" href="../../../python/bosdyn-choreography-client/src/bosdyn/choreography/client/animation_file_conversion_helpers.html">Animation File to Proto Helpers</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/python/fetch_tutorial/fetch1.html">Fetch Tutorial</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/fetch_tutorial/fetch2.html">Part 2: Training the Model</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/fetch_tutorial/fetch3.html">Part 3: Evaluating the Model</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/fetch_tutorial/fetch4.html">Part 4: Autonomous Pick Up</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/fetch_tutorial/fetch5.html">Part 5: Detecting People and Playing Fetch</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/fetch_tutorial/fetch6.html">Part 6: Running the model on Core IO</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/python/daq_tutorial/daq1.html">Data Collection Tutorial</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/daq_tutorial/daq2.html">Part 2: Capturing images</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/daq_tutorial/daq3.html">Part 3: Capturing other data</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/daq_tutorial/daq4.html">Part 4: Deploying to the CORE I/O</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/daq_tutorial/daq5.html">Part 5: Collecting data</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/python/daq_tutorial/daq6.html">Part 6: Processing collected data</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../../docs/payload/README.html">Payloads</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/payload_configuration_requirements.html">Payload configuration requirements</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/mechanical_interfaces.html">Mechanical interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/robot_mounting_rails.html">Robot mounting rails</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/guidelines_for_robust_payload_design.html">Guidelines for robust payload design</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/robot_electrical_interface.html">Robot electrical interface</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/coreio_documentation.html">CORE I/O Documentation</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/coreio_openvpn_extension.html">CORE I/O OpenVPN Extension</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/configuring_payload_software.html">Configuring payload software</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/docker_containers.html">Dockerize payload software</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/payload/spot_core_documentation.html">Pre-3.2 Spot CORE Documentation</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/payload/spot_core_portainer.html">Configuring Docker containers in SpotCORE</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/payload/spot_core_cockpit.html">Spot CORE system management tool: Cockpit</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../docs/payload/spot_core_vnc.html">Spot CORE VNC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../../docs/protos/README.html">API Protocol</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../../../docs/protos/style_guide.html">Style Guide</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html">alerts.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#arm-command-proto">arm_command.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#graph-nav-area-callback-proto">graph_nav/area_callback.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#graph-nav-graph-nav-proto">graph_nav/graph_nav.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#ray-cast-proto">ray_cast.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#robot-command-proto">robot_command.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#robot-command-service-proto">robot_command_service.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#robot-id-proto">robot_id.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#robot-id-service-proto">robot_id_service.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#robot-state-proto">robot_state.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#robot-state-service-proto">robot_state_service.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#service-fault-proto">service_fault.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-door-proto">spot/door.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-door-service-proto">spot/door_service.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-robot-command-proto">spot/robot_command.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-spot-check-proto">spot/spot_check.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-spot-check-service-proto">spot/spot_check_service.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-cam-led-proto">spot_cam/LED.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-cam-compositor-proto">spot_cam/compositor.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#spot-cam-streamquality-proto">spot_cam/streamquality.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#stairs-proto">stairs.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#synchronized-command-proto">synchronized_command.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#time-range-proto">time_range.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#time-sync-proto">time_sync.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#time-sync-service-proto">time_sync_service.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#trajectory-proto">trajectory.proto</a></li>
<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#world-object-proto">world_object.proto</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../../../protos/bosdyn/api/proto_reference.html#standard-types">Standard Types</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../../../choreography_protos/bosdyn/api/README.html">Choreography Proto Reference Guide</a><ul>
<li class="toctree-l3"><a class="reference internal" href="../../../choreography_protos/bosdyn/api/choreography_reference.html">spot/choreography_params.proto</a></li>
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<h1>Source code for bosdyn.bddf.base_data_reader</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright (c) 2022 Boston Dynamics, Inc. All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># Downloading, reproducing, distributing or otherwise using the SDK Software</span>
<span class="c1"># is subject to the terms and conditions of the Boston Dynamics Software</span>
<span class="c1"># Development Kit License (20191101-BDSDK-SL).</span>
<span class="sd">"""BaseDataReader is a shared parent class for DataReader and StreamedDataReader."""</span>
<span class="kn">import</span> <span class="nn">struct</span>
<span class="kn">import</span> <span class="nn">bosdyn.api.bddf_pb2</span> <span class="k">as</span> <span class="nn">bddf</span>
<span class="kn">from</span> <span class="nn">.common</span> <span class="kn">import</span> <span class="p">(</span><span class="n">BLOCK_HEADER_SIZE_MASK</span><span class="p">,</span> <span class="n">BLOCK_HEADER_TYPE_MASK</span><span class="p">,</span> <span class="n">DATA_BLOCK_TYPE</span><span class="p">,</span>
<span class="n">DESCRIPTOR_BLOCK_TYPE</span><span class="p">,</span> <span class="n">END_BLOCK_TYPE</span><span class="p">,</span> <span class="n">LOGGER</span><span class="p">,</span> <span class="n">MAGIC</span><span class="p">,</span> <span class="n">SHA1_DIGEST_NBYTES</span><span class="p">,</span>
<span class="n">ChecksumError</span><span class="p">,</span> <span class="n">DataFormatError</span><span class="p">,</span> <span class="n">ParseError</span><span class="p">)</span>
<div class="viewcode-block" id="BaseDataReader"><a class="viewcode-back" href="../../../python/bosdyn-core/src/bosdyn/bddf/base_data_reader.html#bosdyn.bddf.base_data_reader.BaseDataReader">[docs]</a><span class="k">class</span> <span class="nc">BaseDataReader</span><span class="p">:</span> <span class="c1"># pylint: disable=too-many-instance-attributes</span>
<span class="sd">"""Shared parent class for DataReader and StreamedDataReader."""</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">infile</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">filename</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> At least one of the following arguments must be specified.</span>
<span class="sd"> Args:</span>
<span class="sd"> infile: binary file-like object for reading (e.g., from open(fname, "rb")).</span>
<span class="sd"> filename: path of input file, if applicable.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file</span> <span class="o">=</span> <span class="n">infile</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_filename</span> <span class="o">=</span> <span class="n">filename</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_filename</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"One of infile or filename must be specified"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_filename</span><span class="p">,</span> <span class="s1">'rb'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_spec_index</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_index_offset</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_checksum</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_read_checksum</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_eof</span> <span class="o">=</span> <span class="kc">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_index</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_read_header</span><span class="p">()</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">filename</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Return input file name, if specified, or None if not."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_filename</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">file_descriptor</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Return the file descriptor from the start of the file/stream."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">version</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Return file version as a bosdyn.api.FileFormatVersion proto."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">annotations</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Return {key -> value} dict for file annotations."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">annotations</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">file_index</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Get the FileIndex proto used which describes how to access data in the file."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file_index</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">checksum</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""160-bit checksum read from the end of the file, or None if not yet read."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_checksum</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">read_checksum</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Override to compute checksum on reading, in stream-readers."""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_checksum</span>
<span class="k">def</span> <span class="nf">_computed_checksum</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># pylint: disable=no-self-use</span>
<span class="sd">"""Override to compute checksum on reading, in stream-readers."""</span>
<span class="k">return</span> <span class="kc">None</span>
<div class="viewcode-block" id="BaseDataReader.series_spec_to_index"><a class="viewcode-back" href="../../../python/bosdyn-core/src/bosdyn/bddf/base_data_reader.html#bosdyn.bddf.base_data_reader.BaseDataReader.series_spec_to_index">[docs]</a> <span class="k">def</span> <span class="nf">series_spec_to_index</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">series_spec</span><span class="p">):</span>
<span class="sd">"""Given a series spec (map {key -> value}), return the series index for that series.</span>
<span class="sd"> Raises ValueError if no such series exists.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_spec_index</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">series_spec</span><span class="p">)</span></div>
<span class="k">def</span> <span class="fm">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_close</span><span class="p">()</span>
<span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span>
<span class="k">def</span> <span class="nf">_close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file</span><span class="p">:</span>
<span class="k">return</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">type_</span><span class="p">,</span> <span class="n">value_</span><span class="p">,</span> <span class="n">tb_</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_close</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">_read</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">nbytes</span><span class="p">):</span>
<span class="k">assert</span> <span class="n">nbytes</span>
<span class="n">block</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">nbytes</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">block</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">EOFError</span><span class="p">(</span><span class="s2">"Unexpected end of bddf file"</span><span class="p">)</span>
<span class="k">return</span> <span class="n">block</span>
<span class="k">def</span> <span class="nf">_read_header</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">magic</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">MAGIC</span><span class="p">))</span>
<span class="k">if</span> <span class="n">magic</span> <span class="o">!=</span> <span class="n">MAGIC</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ParseError</span><span class="p">(</span><span class="s2">"Bad magic bytes at the start of the file."</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_desc_block</span><span class="p">(</span><span class="s2">"file_descriptor"</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span><span class="o">.</span><span class="n">major_version</span> <span class="o">!=</span> <span class="mi">1</span> <span class="ow">or</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span><span class="o">.</span><span class="n">minor_version</span> <span class="o">!=</span> <span class="mi">0</span> <span class="ow">or</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span><span class="o">.</span><span class="n">patch_level</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">DataFormatError</span><span class="p">(</span><span class="s2">"Unsupported file version: </span><span class="si">{}</span><span class="s2">.</span><span class="si">{}</span><span class="s2">.</span><span class="si">{}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span><span class="o">.</span><span class="n">major_version</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span><span class="o">.</span><span class="n">minor_version</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">version</span><span class="o">.</span><span class="n">patch_level</span><span class="p">))</span>
<span class="n">checksum_type</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">checksum_type</span>
<span class="c1"># pylint: disable=no-member</span>
<span class="k">if</span> <span class="n">checksum_type</span> <span class="o">==</span> <span class="n">bddf</span><span class="o">.</span><span class="n">FileFormatDescriptor</span><span class="o">.</span><span class="n">CHECKSUM_TYPE_UNKNOWN</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">DataFormatError</span><span class="p">(</span><span class="s2">"Unset checksum type in file descriptor"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">checksum_type</span> <span class="o">==</span> <span class="n">bddf</span><span class="o">.</span><span class="n">FileFormatDescriptor</span><span class="o">.</span><span class="n">CHECKSUM_TYPE_NONE</span><span class="p">:</span>
<span class="n">LOGGER</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"No checksum in bddf stream"</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">checksum_type</span> <span class="o">!=</span> <span class="n">bddf</span><span class="o">.</span><span class="n">FileFormatDescriptor</span><span class="o">.</span><span class="n">CHECKSUM_TYPE_SHA1</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">DataFormatError</span><span class="p">(</span><span class="s2">"Unknown checksum type </span><span class="si">{}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">checksum_type</span><span class="p">))</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">checksum_num_bytes</span> <span class="o">!=</span> <span class="n">SHA1_DIGEST_NBYTES</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">DataFormatError</span><span class="p">(</span><span class="s2">"Unexpected checksum num_bytes (</span><span class="si">{}</span><span class="s2"> != </span><span class="si">{}</span><span class="s2">)."</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">checksum_num_bytes</span><span class="p">,</span> <span class="n">SHA1_DIGEST_NBYTES</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">_read_proto</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">proto_type</span><span class="p">,</span> <span class="n">nbytes</span><span class="p">):</span>
<span class="n">block</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="n">nbytes</span><span class="p">)</span>
<span class="n">descriptor</span> <span class="o">=</span> <span class="n">proto_type</span><span class="p">()</span>
<span class="n">descriptor</span><span class="o">.</span><span class="n">ParseFromString</span><span class="p">(</span><span class="n">block</span><span class="p">)</span>
<span class="k">return</span> <span class="n">descriptor</span>
<span class="k">def</span> <span class="nf">_read_data_block</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">is_data</span><span class="p">,</span> <span class="n">desc</span><span class="p">,</span> <span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_block</span><span class="p">()</span>
<span class="k">assert</span> <span class="n">is_data</span>
<span class="k">return</span> <span class="n">desc</span><span class="p">,</span> <span class="n">data</span>
<span class="k">def</span> <span class="nf">_read_desc_block</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">descriptor_type_name</span><span class="p">):</span>
<span class="n">is_data</span><span class="p">,</span> <span class="n">desc</span><span class="p">,</span> <span class="n">_data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_block</span><span class="p">()</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="n">is_data</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="n">_data</span>
<span class="k">if</span> <span class="n">desc</span><span class="o">.</span><span class="n">WhichOneof</span><span class="p">(</span><span class="s2">"DescriptorType"</span><span class="p">)</span> <span class="o">!=</span> <span class="n">descriptor_type_name</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ParseError</span><span class="p">(</span><span class="s2">"Expected DescriptorType </span><span class="si">{}</span><span class="s2"> but got </span><span class="si">{}</span><span class="s2">."</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">descriptor_type_name</span><span class="p">,</span> <span class="n">desc</span><span class="o">.</span><span class="n">WhichOneof</span><span class="p">(</span><span class="s2">"DescriptorType"</span><span class="p">)))</span>
<span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">desc</span><span class="p">,</span> <span class="n">descriptor_type_name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_read_block</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="p">(</span><span class="n">block_header</span><span class="p">,)</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'<Q'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="mi">8</span><span class="p">))</span>
<span class="n">block_size</span> <span class="o">=</span> <span class="n">block_header</span> <span class="o">&</span> <span class="n">BLOCK_HEADER_SIZE_MASK</span>
<span class="n">block_type</span> <span class="o">=</span> <span class="p">(</span><span class="n">block_header</span> <span class="o">&</span> <span class="n">BLOCK_HEADER_TYPE_MASK</span><span class="p">)</span> <span class="o">>></span> <span class="mi">56</span>
<span class="k">if</span> <span class="n">block_type</span> <span class="o">==</span> <span class="n">END_BLOCK_TYPE</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_index_offset</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'<Q'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="mi">8</span><span class="p">))[</span><span class="mi">0</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_read_checksum</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_computed_checksum</span><span class="p">()</span> <span class="c1"># pylint: disable=assignment-from-none</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_checksum</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">checksum_num_bytes</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_eof</span> <span class="o">=</span> <span class="kc">True</span>
<span class="c1"># pylint: disable=no-member</span>
<span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_file_descriptor</span><span class="o">.</span><span class="n">checksum_type</span> <span class="o">==</span> <span class="n">bddf</span><span class="o">.</span><span class="n">FileFormatDescriptor</span><span class="o">.</span><span class="n">CHECKSUM_TYPE_SHA1</span>
<span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_checksum</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">_checksum</span> <span class="o">!=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_checksum</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ChecksumError</span><span class="p">(</span><span class="s2">"File checksum 0x</span><span class="si">{}</span><span class="s2"> does not match computed value 0x</span><span class="si">{}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="s1">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">'</span><span class="si">{:02X}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_checksum</span><span class="p">),</span>
<span class="s1">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">'</span><span class="si">{:02X}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_checksum</span><span class="p">)))</span>
<span class="k">raise</span> <span class="ne">EOFError</span><span class="p">(</span><span class="s2">"Normal end of bddf file"</span><span class="p">)</span>
<span class="n">is_data_block</span> <span class="o">=</span> <span class="p">(</span><span class="n">block_type</span> <span class="o">==</span> <span class="n">DATA_BLOCK_TYPE</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">is_data_block</span><span class="p">:</span>
<span class="k">if</span> <span class="n">block_type</span> <span class="o">!=</span> <span class="n">DESCRIPTOR_BLOCK_TYPE</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ParseError</span><span class="p">(</span><span class="s2">"Expected block_type </span><span class="si">{}</span><span class="s2"> but got </span><span class="si">{}</span><span class="s2">."</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">DESCRIPTOR_BLOCK_TYPE</span><span class="p">,</span> <span class="n">block_type</span><span class="p">))</span>
<span class="k">return</span> <span class="n">is_data_block</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_proto</span><span class="p">(</span><span class="n">bddf</span><span class="o">.</span><span class="n">DescriptorBlock</span><span class="p">,</span> <span class="n">block_size</span><span class="p">),</span> <span class="kc">None</span>
<span class="p">(</span><span class="n">desc_size</span><span class="p">,)</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="s1">'<I'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="mi">4</span><span class="p">))</span>
<span class="k">if</span> <span class="n">desc_size</span> <span class="o">></span> <span class="n">block_size</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ParseError</span><span class="p">(</span><span class="s2">"Data block descriptor size </span><span class="si">{}</span><span class="s2"> > block size </span><span class="si">{}</span><span class="s2">."</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">desc_size</span><span class="p">,</span> <span class="n">block_size</span><span class="p">))</span>
<span class="n">data_desc</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_proto</span><span class="p">(</span><span class="n">bddf</span><span class="o">.</span><span class="n">DataDescriptor</span><span class="p">,</span> <span class="n">desc_size</span><span class="p">)</span>
<span class="n">data_size</span> <span class="o">=</span> <span class="n">block_size</span> <span class="o">-</span> <span class="n">desc_size</span>
<span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read</span><span class="p">(</span><span class="n">data_size</span><span class="p">)</span>
<span class="k">return</span> <span class="n">is_data_block</span><span class="p">,</span> <span class="n">data_desc</span><span class="p">,</span> <span class="n">data</span></div>
</pre></div>
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