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105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/* Decode a message using msgid prefix to identify message type */
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#include <stdio.h>
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#include <stdlib.h>
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#include <pb_decode.h>
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#include "msgid_example.pb.h"
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#include "test_helpers.h"
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/* This function reads the prefix written by sending side. */
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bool read_prefix(pb_istream_t *stream, int *msgid)
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{
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uint8_t prefix = 0;
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if (!pb_read(stream, &prefix, 1))
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return false;
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*msgid = prefix;
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return true;
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}
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/* Main function will call one of these functions based on the prefix */
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bool handle_MyMessage1(pb_istream_t *stream)
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{
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MyMessage1 msg = MyMessage1_init_default;
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if (!pb_decode(stream, MyMessage1_fields, &msg))
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return false;
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printf("Got MyMessage1: intvalue = %d\n", (int)msg.intvalue);
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return true;
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}
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bool handle_MyMessage2(pb_istream_t *stream)
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{
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MyMessage2 msg = MyMessage2_init_default;
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if (!pb_decode(stream, MyMessage2_fields, &msg))
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return false;
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printf("Got MyMessage2: intvalue = %d, strvalue = %s\n",
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(int)msg.intvalue, msg.strvalue);
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return true;
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}
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bool handle_MyMessage3(pb_istream_t *stream)
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{
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MyMessage3 msg = MyMessage3_init_default;
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if (!pb_decode(stream, MyMessage3_fields, &msg))
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return false;
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printf("Got MyMessage3: boolvalue = %d\n", (int)msg.boolvalue);
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return true;
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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_istream_t stream;
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size_t count;
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bool status = false;
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int prefix;
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/* Read the data into buffer */
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SET_BINARY_MODE(stdin);
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count = fread(buffer, 1, sizeof(buffer), stdin);
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if (!feof(stdin))
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{
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printf("Message does not fit in buffer\n");
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return 1;
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}
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stream = pb_istream_from_buffer(buffer, count);
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if (!read_prefix(&stream, &prefix))
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{
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printf("Failed to read prefix: %s\n", PB_GET_ERROR(&stream));
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return 1;
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}
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/* Call message handler based on prefix.
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* We could write the switch cases manually, comparing against
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* the MyMessageX_msgid defines. However, this uses the automatically
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* generated X-macro construct to make the switch case.
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*/
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switch (prefix)
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{
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#define PB_MSG(id,len,name) case id: status = handle_ ## name(&stream); break;
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MSGID_EXAMPLE_MESSAGES
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#undef PB_MSG
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default: printf("Unknown prefix: %d\n", prefix); return 1;
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}
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if (!status)
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{
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printf("Parsing failed: %s\n", PB_GET_ERROR(&stream));
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return 1;
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} else {
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return 0;
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}
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}
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