1 files changed, 38 insertions, 0 deletions
diff --git a/toolkit/components/bitsdownload/bits_client/bits/src/wide.rs b/toolkit/components/bitsdownload/bits_client/bits/src/wide.rs
new file mode 100644
index 0000000000..c108f8d629
--- /dev/null
+++ b/toolkit/components/bitsdownload/bits_client/bits/src/wide.rs
@@ -0,0 +1,38 @@
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
+// All files in the project carrying such notice may not be copied, modified, or distributed
+// except according to those terms.
+
+// Minimal null-terminated wide string support from wio.
+
+use std::ffi::{OsStr, OsString};
+use std::os::windows::ffi::{OsStrExt, OsStringExt};
+use std::slice;
+
+pub trait ToWideNull {
+    fn to_wide_null(&self) -> Vec<u16>;
+}
+
+impl<T: AsRef<OsStr>> ToWideNull for T {
+    fn to_wide_null(&self) -> Vec<u16> {
+        self.as_ref().encode_wide().chain(Some(0)).collect()
+    }
+}
+
+pub trait FromWidePtrNull {
+    unsafe fn from_wide_ptr_null(wide: *const u16) -> Self;
+}
+
+impl FromWidePtrNull for OsString {
+    unsafe fn from_wide_ptr_null(wide: *const u16) -> Self {
+        assert!(!wide.is_null());
+
+        for i in 0.. {
+            if *wide.offset(i) == 0 {
+                return Self::from_wide(&slice::from_raw_parts(wide, i as usize));
+            }
+        }
+        unreachable!()
+    }
+}