error

[dr-begemot]

In section PROTOBUF_C_LABEL_REPEATED (func protobuf2json_process_message) protobuf_values_count is offset for value, not size!
const size_t *protobuf_values_count = (const size_t *)protobuf_value_quantifier;
then you use it as size

        for (j = 0; j < *protobuf_values_count; j++) {
          const char *protobuf_value_repeated = (*(char * const *)protobuf_value) + j * value_size;
...