Difference between revisions of "Protobuf notes"
m (Link to github.com/hello/kitsune.) |
m (Project kitsune setup_protobuf() function.) |
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* https://github.com/hello/kitsune | * https://github.com/hello/kitsune | ||
| + | |||
| + | In kitsune project, looking at: | ||
| + | |||
| + | (1) file kitsune/kitsune/audio_features_upload_task.c function setup_protbuf( . . . ) | ||
| + | (2) file audio_features_upload_task_helpers.c function encode_repeated_streaming_bytes_and_mark_done(pb_ostream_t *stream, const pb_field_t *field, void * const *arg) | ||
| + | (3) in same file reviewing function write_streams(pb_ostream_t *stream, const pb_field_t *field,hlo_stream_t * hlo_stream) | ||
Revision as of 05:44, 6 October 2024
Introduction:
When compiling nanopb Protobuf library as part of C language programs, nested Protobuf messages require use of nanopb defined function type `pb_callback_t` in order to encode and to decode those nested messages. Some examples of this on github:
In the first example an early on file instance of `pb_callback_t` occurs on line 56. Looking further this project has a few dozen protoc generated files . . . switching to a possible smaller project:
In kitsune project, looking at:
(1) file kitsune/kitsune/audio_features_upload_task.c function setup_protbuf( . . . ) (2) file audio_features_upload_task_helpers.c function encode_repeated_streaming_bytes_and_mark_done(pb_ostream_t *stream, const pb_field_t *field, void * const *arg) (3) in same file reviewing function write_streams(pb_ostream_t *stream, const pb_field_t *field,hlo_stream_t * hlo_stream)
^ References To Sort
Protobuf references, somewhat arbitrary starting point yet introduces some key topics of Protobuf standard and use cases:
- https://www.crankuptheamps.com/blog/posts/2017/10/12/protobuf-battle-of-the-syntaxes/
- https://www.educative.io/edpresso/what-is-the-difference-between-protocol-buffers-and-json
JSON supported data types:
First Protobuf .proto file, compiles using `protoc-c`, part of a package available with Ubuntu 20.04:
// syntax = "proto3";
syntax = "proto2";
// Notes:
// $ protoc-c --c_out=. ./first.proto
message sensorUpdates {
required int32 message_id = 1;
optional float vrms = 2;
}
. . . It appears that the integer values which message elements are assigned as tantamount to key names in JSON.
^ Nanopb
2022-01-08 Saturday
- https://github.com/nanopb/nanopb/blob/master/generator/proto/nanopb.proto
- https://jpa.kapsi.fi/nanopb/docs/whats_new.html
- https://jpa.kapsi.fi/nanopb/docs/
Cmake script to locate Nanopb headers and sources:
