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/* Decoding testcase for callback fields.
* Run e.g. ./test_encode_callbacks | ./test_decode_callbacks
*/
#include <stdio.h>
#include <pb_decode.h>
#include "callbacks.pb.h"
bool print_string(pb_istream_t *stream, const pb_field_t *field, void *arg)
{
uint8_t buffer[1024] = {0};
/* We could read block-by-block to avoid the large buffer... */
if (stream->bytes_left > sizeof(buffer) - 1)
return false;
if (!pb_read(stream, buffer, stream->bytes_left))
return false;
/* Print the string, in format comparable with protoc --decode.
* Format comes from the arg defined in main().
*/
printf((char*)arg, buffer);
return true;
}
bool print_int32(pb_istream_t *stream, const pb_field_t *field, void *arg)
{
uint64_t value;
if (!pb_decode_varint(stream, &value))
return false;
printf((char*)arg, (int32_t)value);
return true;
}
bool print_fixed32(pb_istream_t *stream, const pb_field_t *field, void *arg)
{
uint32_t value;
if (!pb_dec_fixed32(stream, NULL, &value))
return false;
printf((char*)arg, value);
return true;
}
bool print_fixed64(pb_istream_t *stream, const pb_field_t *field, void *arg)
{
uint64_t value;
if (!pb_dec_fixed64(stream, NULL, &value))
return false;
printf((char*)arg, value);
return true;
}
int main()
{
uint8_t buffer[1024];
size_t length = fread(buffer, 1, 1024, stdin);
pb_istream_t stream = pb_istream_from_buffer(buffer, length);
/* Note: empty initializer list initializes the struct with all-0.
* This is recommended so that unused callbacks are set to NULL instead
* of crashing at runtime.
*/
TestMessage testmessage = {};
testmessage.submsg.stringvalue.funcs.decode = &print_string;
testmessage.submsg.stringvalue.arg = "submsg {\n stringvalue: \"%s\"\n";
testmessage.submsg.int32value.funcs.decode = &print_int32;
testmessage.submsg.int32value.arg = " int32value: %d\n";
testmessage.submsg.fixed32value.funcs.decode = &print_fixed32;
testmessage.submsg.fixed32value.arg = " fixed32value: %d\n";
testmessage.submsg.fixed64value.funcs.decode = &print_fixed64;
testmessage.submsg.fixed64value.arg = " fixed64value: %lld\n}\n";
testmessage.stringvalue.funcs.decode = &print_string;
testmessage.stringvalue.arg = "stringvalue: \"%s\"\n";
testmessage.int32value.funcs.decode = &print_int32;
testmessage.int32value.arg = "int32value: %d\n";
testmessage.fixed32value.funcs.decode = &print_fixed32;
testmessage.fixed32value.arg = "fixed32value: %d\n";
testmessage.fixed64value.funcs.decode = &print_fixed64;
testmessage.fixed64value.arg = "fixed64value: %lld\n";
if (!pb_decode(&stream, TestMessage_fields, &testmessage))
return 1;
return 0;
}
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