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90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/* Encode a message using msgid field as prefix */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pb_encode.h>
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#include "msgid_example.pb.h"
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#include "test_helpers.h"
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/* This function writes the message id as a prefix to the message, allowing
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* the receiving side to identify message type. Here we use uint8_t to store
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* it, but e.g. varint or some custom header struct would work just as well.
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*/
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bool write_prefix(pb_ostream_t *stream, int msgid)
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{
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uint8_t prefix = msgid;
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return pb_write(stream, &prefix, 1);
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}
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/* The main logic will call one of these functions.
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* Normally which function you call would be selected based on what message
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* you want to send, here it is decided based on command line parameter.
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*/
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bool encode_MyMessage1(pb_ostream_t *stream)
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{
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MyMessage1 msg = MyMessage1_init_default;
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msg.intvalue = 1234;
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return write_prefix(stream, MyMessage1_msgid)
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&& pb_encode(stream, MyMessage1_fields, &msg);
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}
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bool encode_MyMessage2(pb_ostream_t *stream)
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{
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MyMessage2 msg = MyMessage2_init_default;
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msg.intvalue = 9999;
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strcpy(msg.strvalue, "Msg2");
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return write_prefix(stream, MyMessage2_msgid)
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&& pb_encode(stream, MyMessage2_fields, &msg);
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}
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bool encode_MyMessage3(pb_ostream_t *stream)
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{
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MyMessage3 msg = MyMessage3_init_default;
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msg.boolvalue = true;
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return write_prefix(stream, MyMessage3_msgid)
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&& pb_encode(stream, MyMessage3_fields, &msg);
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}
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int main(int argc, char **argv)
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{
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uint8_t buffer[128];
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pb_ostream_t stream;
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bool status = false;
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int option;
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if (argc != 2)
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{
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fprintf(stderr, "Usage: encode_msgid [number]\n");
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return 1;
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}
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option = atoi(argv[1]);
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stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
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if (option == 1)
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{
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status = encode_MyMessage1(&stream);
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}
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else if (option == 2)
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{
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status = encode_MyMessage2(&stream);
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}
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else if (option == 3)
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{
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status = encode_MyMessage3(&stream);
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}
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if (status)
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{
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SET_BINARY_MODE(stdout);
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fwrite(buffer, 1, stream.bytes_written, stdout);
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return 0;
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}
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else
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{
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fprintf(stderr, "Encoding failed: %s\n", PB_GET_ERROR(&stream));
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return 1;
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}
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}
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