in gridstore download stream ensure that start is never bigger than end

Author: NickOvt

lib/attachments/gridstore-storage.js

@@ -373,6 +373,27 @@ class GridstoreStorage {
             if (streamOptions.end && streamOptions.end > attachmentData.length) {
                 streamOptions.end = attachmentData.length;
             }
+
+            // Handle case where start equals or exceeds end
+            if (streamOptions.start && streamOptions.end && streamOptions.start >= streamOptions.end) {
+                streamOptions.start = attachmentData.length;
+                streamOptions.end = attachmentData.length;
+            }
+
+            // Handle case where start equals file length (EOF scenario)
+            if (streamOptions.start === attachmentData.length && !streamOptions.end) {
+                streamOptions.end = attachmentData.length;
+            }
+
+            if (streamOptions.end === null || streamOptions.end === undefined) {
+                // still no stream end, default to length
+                streamOptions.end = attachmentData.length;
+            }
+
+            if (streamOptions.start > streamOptions.end) {
+                // Ensure in any case that start is never bigger than end
+                streamOptions.start = streamOptions.end;
+            }
         }
 
         log.silly(