214b0eae8a
NOTE: This change breaks backwards-compatibility by default.
If you have old callback functions, you can define PB_OLD_CALLBACK_STYLE
to retain the old behaviour.
If you want to convert your old callbacks to new signature, you need
to do the following:
1) Change decode callback argument to void **arg
and encode callback argument to void * const *arg.
2) Change any reference to arg into *arg.
The rationale for making the new behaviour the default is that it
simplifies the common case of "allocate some memory in decode callback".
Update issue 69
Status: FixedInGit
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* Decoding testcase for callback fields.
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* Run e.g. ./test_encode_callbacks | ./test_decode_callbacks
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*/
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#include <stdio.h>
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#include <pb_decode.h>
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#include "callbacks.pb.h"
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bool print_string(pb_istream_t *stream, const pb_field_t *field, void **arg)
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{
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uint8_t buffer[1024] = {0};
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/* We could read block-by-block to avoid the large buffer... */
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if (stream->bytes_left > sizeof(buffer) - 1)
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return false;
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if (!pb_read(stream, buffer, stream->bytes_left))
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return false;
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/* Print the string, in format comparable with protoc --decode.
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* Format comes from the arg defined in main().
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*/
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printf((char*)*arg, buffer);
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return true;
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}
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bool print_int32(pb_istream_t *stream, const pb_field_t *field, void **arg)
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{
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uint64_t value;
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if (!pb_decode_varint(stream, &value))
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return false;
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printf((char*)*arg, (long)value);
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return true;
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}
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bool print_fixed32(pb_istream_t *stream, const pb_field_t *field, void **arg)
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{
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uint32_t value;
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if (!pb_decode_fixed32(stream, &value))
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return false;
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printf((char*)*arg, (long)value);
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return true;
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}
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bool print_fixed64(pb_istream_t *stream, const pb_field_t *field, void **arg)
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{
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uint64_t value;
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if (!pb_decode_fixed64(stream, &value))
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return false;
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printf((char*)*arg, (long long)value);
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return true;
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}
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int main()
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{
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uint8_t buffer[1024];
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size_t length = fread(buffer, 1, 1024, stdin);
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pb_istream_t stream = pb_istream_from_buffer(buffer, length);
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/* Note: empty initializer list initializes the struct with all-0.
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* This is recommended so that unused callbacks are set to NULL instead
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* of crashing at runtime.
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*/
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TestMessage testmessage = {};
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testmessage.submsg.stringvalue.funcs.decode = &print_string;
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testmessage.submsg.stringvalue.arg = "submsg {\n stringvalue: \"%s\"\n";
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testmessage.submsg.int32value.funcs.decode = &print_int32;
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testmessage.submsg.int32value.arg = " int32value: %ld\n";
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testmessage.submsg.fixed32value.funcs.decode = &print_fixed32;
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testmessage.submsg.fixed32value.arg = " fixed32value: %ld\n";
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testmessage.submsg.fixed64value.funcs.decode = &print_fixed64;
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testmessage.submsg.fixed64value.arg = " fixed64value: %lld\n}\n";
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testmessage.stringvalue.funcs.decode = &print_string;
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testmessage.stringvalue.arg = "stringvalue: \"%s\"\n";
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testmessage.int32value.funcs.decode = &print_int32;
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testmessage.int32value.arg = "int32value: %ld\n";
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testmessage.fixed32value.funcs.decode = &print_fixed32;
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testmessage.fixed32value.arg = "fixed32value: %ld\n";
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testmessage.fixed64value.funcs.decode = &print_fixed64;
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testmessage.fixed64value.arg = "fixed64value: %lld\n";
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if (!pb_decode(&stream, TestMessage_fields, &testmessage))
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return 1;
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return 0;
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}
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