Sannis / protobuf2json-c

Pure C implementation of Protobuf to/from JSON converter

protobuf2json-c

This is protobuf2json-c, pure C implementation of the Google Protocol Buffers to/from JSON converter.

Building

protobuf2json-c requires a C compiler, protobuf-c 1.1.0 and jansson 2.7 to be installed. If building from a git checkout, the autotools (autoconf, automake, libtool) must also be installed, and the build system must be generated by running the autogen.sh script:

./autogen.sh && ./configure && make && make install

API

protobuf2json-c piblic API containt 6 functions: 3 for Protobuf to JSON conversion and 3 for JSON to Protobuf conversion. They uses json_t object, char * C-string or file for JSON.

Protobuf to JSON conversion functions:

int protobuf2json_object(
  ProtobufCMessage *protobuf_message,
  json_t **json_object,
  char *error_string,
  size_t error_size
);

int protobuf2json_string(
  ProtobufCMessage *protobuf_message,
  size_t json_flags,
  char **json_string,
  char *error_string,
  size_t error_size
);

int protobuf2json_file(
  ProtobufCMessage *protobuf_message,
  size_t json_flags,
  char *json_file,
  char *fopen_mode,
  char *error_string,
  size_t error_size
);

JSON to Protobuf conversion functions:

int json2protobuf_object(
  json_t *json_object,
  const ProtobufCMessageDescriptor *protobuf_message_descriptor,
  ProtobufCMessage **protobuf_message,
  char *error_string,
  size_t error_size
);

int json2protobuf_string(
  char *json_string,
  size_t json_flags,
  const ProtobufCMessageDescriptor *protobuf_message_descriptor,
  ProtobufCMessage **protobuf_message,
  char *error_string,
  size_t error_size
);

int json2protobuf_file(
  char *json_file,
  size_t json_flags,
  const ProtobufCMessageDescriptor *protobuf_message_descriptor,
  ProtobufCMessage **protobuf_message,
  char *error_string,
  size_t error_size
);

Each of them have error_string and error_size arguments used to pass error description from protobuf2json-c functions. You can pass NULL and 0 to avoid setting error description.

Credits

protobuf2json-c based on code from:

• https://github.com/wickedck/protobuf-to-json
• https://github.com/renenglish/pb2json
• https://github.com/michaelstorm/Tangent

License

MIT license. See license text in file LICENSE.