feat: Remove writing of native camera RAW formats from SDK (#814)

* feat: Remove writing of native camera RAW formats from SDK

Writers of native formats cannot be easily tested and are beyond the
scope of the SDK.

* Add specific test for TIFF CAI writer handler.

sdk/src/asset_handlers/tiff_io.rs

@@ -68,6 +68,16 @@ static SUPPORTED_TYPES: [&str; 10] = [
     "image/x-nikon-nef",
 ];
 
+// Writing native formats is beyond the scope of the SDK.
+static SUPPORTED_WRITER_TYPES: [&str; 6] = [
+    "tif",
+    "tiff",
+    "image/tiff",
+    "dng",
+    "image/dng",
+    "image/x-adobe-dng",
+];
+
 // The type of an IFD entry
 #[derive(Debug, PartialEq)]
 enum IFDEntryType {
@@ -1414,7 +1424,11 @@ impl AssetIO for TiffIO {
     }
 
     fn get_writer(&self, asset_type: &str) -> Option<Box<dyn CAIWriter>> {
-        Some(Box::new(TiffIO::new(asset_type)))
+        if SUPPORTED_WRITER_TYPES.contains(&asset_type) {
+            Some(Box::new(TiffIO::new(asset_type)))
+        } else {
+            None
+        }
     }
 
     fn remote_ref_writer_ref(&self) -> Option<&dyn RemoteRefEmbed> {

sdk/src/jumbf_io.rs

@@ -423,6 +423,28 @@ pub mod tests {
         }
     }
 
+    #[test]
+    fn test_get_writer_tiff() {
+        let h = TiffIO::new("");
+        // Writing native formats is beyond the scope of the SDK.
+        // Only the following are supported.
+        let supported_tiff_types: [&str; 6] = [
+            "tif",
+            "tiff",
+            "image/tiff",
+            "dng",
+            "image/dng",
+            "image/x-adobe-dng",
+        ];
+        for tiff_type in h.supported_types() {
+            if supported_tiff_types.contains(tiff_type) {
+                assert!(get_caiwriter_handler(tiff_type).is_some());
+            } else {
+                assert!(get_caiwriter_handler(tiff_type).is_none());
+            }
+        }
+    }
+
     #[test]
     fn test_get_supported_list() {
         let supported = get_supported_types();