Fixed a bug related to submessage encoding into memory buffer.

Stream state was not copied back from substream in pb_enc_submessage,
which caused garbage output if the stream callback modified the state.

Expanded tests to cover this problem.

Thanks to Paweł Pery for debugging and reporting this problem.


git-svn-id: https://svn.kapsi.fi/jpa/nanopb@1089 e3a754e5-d11d-0410-8d38-ebb782a927b9

tests/test_encode1.c

@@ -1,31 +1,32 @@
 /* A very simple encoding test case using person.proto.
- * Just puts constant data in the fields and writes the
- * data to stdout.
+ * Just puts constant data in the fields and encodes into
+ * buffer, which is then written to stdout.
  */
 
 #include <stdio.h>
 #include <pb_encode.h>
 #include "person.pb.h"
 
-/* This binds the pb_ostream_t into the stdout stream */
-bool streamcallback(pb_ostream_t *stream, const uint8_t *buf, size_t count)
-{
-    FILE *file = (FILE*) stream->state;
-    return fwrite(buf, 1, count, file) == count;
-}
-
 int main()
 {
     /* Initialize the structure with constants */
     Person person = {"Test Person 99", 99, true, "test@person.com",
-        1, {{"555-12345678", true, Person_PhoneType_MOBILE}}};
-    
-    /* Prepare the stream, output goes directly to stdout */
-    pb_ostream_t stream = {&streamcallback, stdout, SIZE_MAX, 0};
+        3, {{"555-12345678", true, Person_PhoneType_MOBILE},
+            {"99-2342", false, 0},
+            {"1234-5678", true, Person_PhoneType_WORK},
+        }};
+
+    uint8_t buffer[512];
+    pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
     
     /* Now encode it and check if we succeeded. */
     if (pb_encode(&stream, Person_fields, &person))
+    {
+        fwrite(buffer, stream.bytes_written, 1, stdout);
         return 0; /* Success */
+    }
     else
+    {
         return 1; /* Failure */
+    }
 }