Bugfixes

* mailbox/header.c (header_seek): Do not dereference
hstr->hdr->size directly, because it may not be initialized yet.
Use mu_header_size instead.
* mailbox/message.c (_message_stream_readdelim): Break the loop
if mu_stream_readdelim returned error or EOF.

@@ -934,8 +934,14 @@ int
 header_seek (mu_stream_t str, mu_off_t off, mu_off_t *presult)
 { 
   struct _mu_header_stream *hstr = (struct _mu_header_stream *) str;
-
-  if (off < 0 || off > hstr->hdr->size)
+  size_t size;
+  int status;
+    
+  status = mu_header_size (hstr->hdr, &size);
+  if (status)
+    return status;
+  
+  if (off < 0 || off > size)
     return ESPIPE;
   hstr->off = off;
   *presult = off;

@@ -240,6 +240,8 @@ _message_stream_readdelim (struct _mu_stream *str, char *buf, size_t bufsize,
       if (sp->state == _mss_eof)
 	break;
       rc = mu_stream_readdelim (sp->transport, buf, bufsize, delim, &n);
+      if (rc || n == 0)
+	break;
       nread += n;
       buf += n;
       bufsize -= n;