Add pb_decode_noinit and use it from pb_dec_submessage.

This avoids double initialization when decoding nested submessages.

Update issue 28
Status: FixedInGit

1 files changed, 8 insertions, 4 deletions

diff --git a/pb_decode.c b/pb_decode.c
index 9d65504c..601dc742 100644
--- a/pb_decode.c
+++ b/pb_decode.c
@@ -415,13 +415,11 @@ static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_str
  * Decode all fields *
  *********************/
 
-bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
+bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
 {
     uint8_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 7) / 8] = {0}; /* Used to check for required fields */
     pb_field_iterator_t iter;
     
-    pb_message_set_to_defaults(fields, dest_struct);
-    
     pb_field_init(&iter, fields, dest_struct);
     
     while (stream->bytes_left)
@@ -470,6 +468,12 @@ bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void
     return true;
 }
 
+bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
+{
+    pb_message_set_to_defaults(fields, dest_struct);
+    return pb_decode_noinit(stream, fields, dest_struct);
+}
+
 /* Field decoders */
 
 bool pb_decode_svarint(pb_istream_t *stream, int64_t *dest)
@@ -615,7 +619,7 @@ bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field
     if (field->ptr == NULL)
         PB_RETURN_ERROR(stream, "invalid field descriptor");
     
-    status = pb_decode(&substream, (pb_field_t*)field->ptr, dest);
+    status = pb_decode_noinit(&substream, (pb_field_t*)field->ptr, dest);
     pb_close_string_substream(stream, &substream);
     return status;
 }