1 files changed, 29 insertions, 0 deletions
diff --git a/src/gallery-utils.c b/src/gallery-utils.c
index 8ec258a..29c456d 100644
--- a/src/gallery-utils.c
+++ b/src/gallery-utils.c
@@ -326,3 +326,32 @@ log_error (const gchar *format, ...)
 
   stats_errors_inc ();
 }
+
+
+/*
+ *   needs_update: returns TRUE if the destionation file needs updating, also when missing
+ */
+gboolean
+needs_update (const char *source, const char *dest)
+{
+  struct stat src_stat;
+  struct stat dst_stat;
+
+  memset (&src_stat, 0, sizeof (src_stat));
+  memset (&dst_stat, 0, sizeof (dst_stat));
+
+  /*  if we can't stat the source file, return FALSE to prevent further errors during update  */
+  if (stat (source, &src_stat) == -1) {
+    log_error ("needs_update: cannot stat source file \"%s\": %s\n", source, strerror (errno));
+    return FALSE;
+  }
+
+  /*  if we can't stat the destination file, we need update anyway  */
+  if (stat (dest, &dst_stat) == -1)
+    return TRUE;
+  /*  destination file size should not be zero  */
+  if (dst_stat.st_size <= 0)
+    return TRUE;
+
+  return (src_stat.st_mtime > dst_stat.st_mtime);
+}