Tests for callback fields

git-svn-id: https://svn.kapsi.fi/jpa/nanopb@974 e3a754e5-d11d-0410-8d38-ebb782a927b9

tests/test_encode_callbacks.c

@@ -0,0 +1,33 @@
+/* Encoding testcase for callback fields */
+
+#include <stdio.h>
+#include <string.h>
+#include <pb_encode.h>
+#include "callbacks.pb.h"
+
+bool encode_string(pb_ostream_t *stream, const pb_field_t *field, const void *arg)
+{
+    char *str = "Hello world!";
+    
+    if (!pb_encode_tag_for_field(stream, field))
+        return false;
+    
+    return pb_encode_string(stream, (uint8_t*)str, strlen(str));
+}
+
+int main()
+{
+    uint8_t buffer[1024];
+    pb_ostream_t stream = pb_ostream_from_buffer(buffer, 1024);
+    TestMessage testmessage = {};
+    
+    testmessage.stringvalue.funcs.encode = &encode_string;
+    
+    if (!pb_encode(&stream, TestMessage_fields, &testmessage))
+        return 1;
+    
+    if (fwrite(buffer, stream.bytes_written, 1, stdout) != 1)
+        return 2;
+    
+    return 0;
+}