1 files changed, 25 insertions, 0 deletions
diff --git a/dom/fs/parent/rust/mime-guess-ffi/src/lib.rs b/dom/fs/parent/rust/mime-guess-ffi/src/lib.rs
new file mode 100644
index 0000000000..8f9492e724
--- /dev/null
+++ b/dom/fs/parent/rust/mime-guess-ffi/src/lib.rs
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+extern crate mime_guess;
+extern crate nsstring;
+
+use nsstring::{nsACString, nsCString};
+use std::path::Path;
+use std::str;
+
+#[no_mangle]
+pub extern "C" fn mimeGuessFromPath(path: &nsACString, content_type: &mut nsCString) {
+    let path_data = str::from_utf8(path.as_ref());
+    if path_data.is_err() {
+        return; // Not UTF8
+    }
+
+    let maybe_mime = mime_guess::from_path(Path::new(path_data.unwrap())).first_raw();
+    if maybe_mime.is_none() {
+        return; // Not recognized
+    }
+
+    content_type.assign(maybe_mime.unwrap());
+}