[shotwell] Add meta-data for fast JPEG sniffer

[Jens Georg <jensgeorg src gnome org>]

commit 9dac2366ca1276a335450dc5fc950bd2e8769122
Author: Jens Georg <mail jensge org>
Date:   Wed Oct 23 20:56:24 2019 +0200

    Add meta-data for fast JPEG sniffer

 src/photos/JfifSupport.vala | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/src/photos/JfifSupport.vala b/src/photos/JfifSupport.vala
index a0c075cb..17b38516 100644
--- a/src/photos/JfifSupport.vala
+++ b/src/photos/JfifSupport.vala
@@ -119,8 +119,13 @@ public class JfifSniffer : GdkSniffer {
     private DetectedPhotoInformation? fast_sniff(out bool is_corrupted) throws Error {
         var detected = new DetectedPhotoInformation();
 
-        // Rely on GdkSniffer to detect corruption
-        is_corrupted = false;
+        detected.metadata = new PhotoMetadata();
+        try {
+            detected.metadata.read_from_file(file);
+        } catch (Error err) {
+            // no metadata detected
+            detected.metadata = null;
+        }
 
         var fins = file.read(null);
         var dins = new DataInputStream(fins);