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/* Encode a message using callbacks inside oneof fields.
* For encoding, callbacks inside oneofs require nothing special
* so this is just normal callback usage.
*/
#include <stdio.h>
#include <stdlib.h>
#include <pb_encode.h>
#include "oneof.pb.h"
#include "test_helpers.h"
/* This is a nanopb-0.4 style global callback, that is referred by function name
* and does not have to be bound separately to the message. It also allows defining
* a custom data type for the field in the structure.
*/
bool SubMsg3_callback(pb_istream_t *istream, pb_ostream_t *ostream, const pb_field_t *field)
{
if (ostream && field->tag == SubMsg3_strvalue_tag)
{
/* Our custom data type is char* */
const char *str = *(const char**)field->pData;
if (!pb_encode_tag_for_field(ostream, field))
return false;
return pb_encode_string(ostream, (const uint8_t*)str, strlen(str));
}
return true;
}
/* The two callbacks below are traditional callbacks that use function pointers
* defined in pb_callback_t.
*/
bool encode_int32_array(pb_ostream_t *stream, const pb_field_t *field, void * const *arg)
{
int i;
for (i = 0; i < 15; i++)
{
if (!pb_encode_tag_for_field(stream, field))
return false;
if (!pb_encode_varint(stream, i))
return false;
}
return true;
}
bool encode_string(pb_ostream_t *stream, const pb_field_t *field, void * const *arg)
{
const char *str = "mystring";
if (!pb_encode_tag_for_field(stream, field))
return false;
return pb_encode_string(stream, (const uint8_t*)str, strlen(str));
}
int main(int argc, char **argv)
{
uint8_t buffer[256];
OneOfMessage msg = OneOfMessage_init_zero;
pb_ostream_t stream;
int option;
if (argc != 2)
{
fprintf(stderr, "Usage: encode_oneof [number]\n");
return 1;
}
option = atoi(argv[1]);
/* Prefix and suffix are used to test that the union does not disturb
* other fields in the same message. */
msg.prefix = 123;
/* We encode one of the 'values' fields based on command line argument */
if (option == 1)
{
msg.which_values = OneOfMessage_intvalue_tag;
msg.values.intvalue = 999;
}
else if (option == 2)
{
msg.which_values = OneOfMessage_strvalue_tag;
strcpy(msg.values.strvalue, "abcd");
}
else if (option == 3)
{
msg.which_values = OneOfMessage_submsg1_tag;
msg.values.submsg1.array.funcs.encode = encode_int32_array;
}
else if (option == 4)
{
msg.which_values = OneOfMessage_submsg2_tag;
msg.values.submsg2.strvalue.funcs.encode = encode_string;
}
else if (option == 5)
{
msg.which_values = OneOfMessage_submsg3_tag;
msg.values.submsg3.which_values = SubMsg3_intvalue_tag;
msg.values.submsg3.values.intvalue = 1234;
}
else if (option == 6)
{
msg.which_values = OneOfMessage_submsg3_tag;
msg.values.submsg3.which_values = SubMsg3_strvalue_tag;
msg.values.submsg3.values.strvalue = "efgh";
}
msg.suffix = 321;
stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
if (pb_encode(&stream, OneOfMessage_fields, &msg))
{
SET_BINARY_MODE(stdout);
fwrite(buffer, 1, stream.bytes_written, stdout);
return 0;
}
else
{
fprintf(stderr, "Encoding failed: %s\n", PB_GET_ERROR(&stream));
return 1;
}
}
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