1 /* Decoding testcase for callback fields.
2  * Run e.g. ./test_encode_callbacks | ./test_decode_callbacks
3  */
4 
5 #include <stdio.h>
6 #include <pb_decode.h>
7 #include "callbacks.pb.h"
8 #include "test_helpers.h"
9 
10 bool print_string(pb_istream_t *stream, const pb_field_t *field, void **arg)
11 {
12     uint8_t buffer[1024] = {0};
13 
14     /* We could read block-by-block to avoid the large buffer... */
15     if (stream->bytes_left > sizeof(buffer) - 1)
16         return false;
17 
18     if (!pb_read(stream, buffer, stream->bytes_left))
19         return false;
20 
21     /* Print the string, in format comparable with protoc --decode.
22      * Format comes from the arg defined in main().
23      */
24     printf((char*)*arg, buffer);
25     return true;
26 }
27 
28 bool print_int32(pb_istream_t *stream, const pb_field_t *field, void **arg)
29 {
30     uint64_t value;
31     if (!pb_decode_varint(stream, &value))
32         return false;
33 
34     printf((char*)*arg, (long)value);
35     return true;
36 }
37 
38 bool print_fixed32(pb_istream_t *stream, const pb_field_t *field, void **arg)
39 {
40     uint32_t value;
41     if (!pb_decode_fixed32(stream, &value))
42         return false;
43 
44     printf((char*)*arg, (long)value);
45     return true;
46 }
47 
48 bool print_fixed64(pb_istream_t *stream, const pb_field_t *field, void **arg)
49 {
50     uint64_t value;
51     if (!pb_decode_fixed64(stream, &value))
52         return false;
53 
54     printf((char*)*arg, (long)value);
55     return true;
56 }
57 
58 int main()
59 {
60     uint8_t buffer[1024];
61     size_t length;
62     pb_istream_t stream;
63     /* Note: empty initializer list initializes the struct with all-0.
64      * This is recommended so that unused callbacks are set to NULL instead
65      * of crashing at runtime.
66      */
67     TestMessage testmessage = {{{NULL}}};
68 
69     SET_BINARY_MODE(stdin);
70     length = fread(buffer, 1, 1024, stdin);
71     stream = pb_istream_from_buffer(buffer, length);
72 
73     testmessage.submsg.stringvalue.funcs.decode = &print_string;
74     testmessage.submsg.stringvalue.arg = "submsg {\n  stringvalue: \"%s\"\n";
75     testmessage.submsg.int32value.funcs.decode = &print_int32;
76     testmessage.submsg.int32value.arg = "  int32value: %ld\n";
77     testmessage.submsg.fixed32value.funcs.decode = &print_fixed32;
78     testmessage.submsg.fixed32value.arg = "  fixed32value: %ld\n";
79     testmessage.submsg.fixed64value.funcs.decode = &print_fixed64;
80     testmessage.submsg.fixed64value.arg = "  fixed64value: %ld\n}\n";
81 
82     testmessage.stringvalue.funcs.decode = &print_string;
83     testmessage.stringvalue.arg = "stringvalue: \"%s\"\n";
84     testmessage.int32value.funcs.decode = &print_int32;
85     testmessage.int32value.arg = "int32value: %ld\n";
86     testmessage.fixed32value.funcs.decode = &print_fixed32;
87     testmessage.fixed32value.arg = "fixed32value: %ld\n";
88     testmessage.fixed64value.funcs.decode = &print_fixed64;
89     testmessage.fixed64value.arg = "fixed64value: %ld\n";
90     testmessage.repeatedstring.funcs.decode = &print_string;
91     testmessage.repeatedstring.arg = "repeatedstring: \"%s\"\n";
92 
93     if (!pb_decode(&stream, TestMessage_fields, &testmessage))
94         return 1;
95 
96     return 0;
97 }
98