[evolution-ews/gnome-3-24] Bug 780391 - Truncate cache stream before resaving received message

[Milan Crha <mcrha src gnome org>]

commit e410b8afade6f94f9a6b8eaada20a476747d7885
Author: Milan Crha <mcrha redhat com>
Date:   Wed Mar 22 12:50:31 2017 +0100

    Bug 780391 - Truncate cache stream before resaving received message

 src/camel/camel-ews-folder.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/src/camel/camel-ews-folder.c b/src/camel/camel-ews-folder.c
index b56724b..2368be1 100644
--- a/src/camel/camel-ews-folder.c
+++ b/src/camel/camel-ews-folder.c
@@ -744,6 +744,26 @@ camel_ews_folder_get_message (CamelFolder *folder,
                        /* Ignore errors here, it's nothing fatal in this case */
                        cache_stream = ews_data_cache_get (ews_folder->cache, "cur", uid, NULL);
                        if (cache_stream) {
+                               GIOStream *iostream;
+
+                               /* Truncate the stream first, in case the message will be shorter
+                                  than the one received from the server */
+                               iostream = camel_stream_ref_base_stream (cache_stream);
+                               if (iostream) {
+                                       GOutputStream *output_stream;
+
+                                       output_stream = g_io_stream_get_output_stream (iostream);
+                                       if (G_IS_SEEKABLE (output_stream)) {
+                                               GSeekable *seekable = G_SEEKABLE (output_stream);
+
+                                               if (g_seekable_can_truncate (seekable)) {
+                                                       g_seekable_truncate (seekable, 0, NULL, NULL);
+                                               }
+                                       }
+
+                                       g_object_unref (iostream);
+                               }
+
                                camel_data_wrapper_write_to_stream_sync (CAMEL_DATA_WRAPPER (message), 
cache_stream, cancellable, NULL);
                                g_object_unref (cache_stream);
                        }