Merge "Add conversions between NativeHandle and AIDL NativeHandle." into main

Author: Treehugger Robot

libs/nativewindow/rust/Android.bp

@@ -110,6 +110,7 @@ rust_defaults {
     name: "libnativewindow_defaults",
     srcs: ["src/lib.rs"],
     rustlibs: [
+        "android.hardware.common-V2-rust",
         "libbinder_rs",
         "libbitflags",
         "libnativewindow_bindgen",

libs/nativewindow/rust/src/handle.rs

@@ -12,6 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use android_hardware_common::{
+    aidl::android::hardware::common::NativeHandle::NativeHandle as AidlNativeHandle,
+    binder::ParcelFileDescriptor,
+};
 use std::{
     ffi::c_int,
     mem::forget,
@@ -190,6 +194,21 @@ impl Drop for NativeHandle {
     }
 }
 
+impl From<AidlNativeHandle> for NativeHandle {
+    fn from(aidl_native_handle: AidlNativeHandle) -> Self {
+        let fds = aidl_native_handle.fds.into_iter().map(OwnedFd::from).collect();
+        Self::new(fds, &aidl_native_handle.ints).unwrap()
+    }
+}
+
+impl From<NativeHandle> for AidlNativeHandle {
+    fn from(native_handle: NativeHandle) -> Self {
+        let ints = native_handle.ints().to_owned();
+        let fds = native_handle.into_fds().into_iter().map(ParcelFileDescriptor::new).collect();
+        Self { ints, fds }
+    }
+}
+
 // SAFETY: `NativeHandle` owns the `native_handle_t`, which just contains some integers and file
 // descriptors, which aren't tied to any particular thread.
 unsafe impl Send for NativeHandle {}
@@ -240,4 +259,20 @@ mod test {
 
         drop(cloned);
     }
+
+    #[test]
+    fn to_from_aidl() {
+        let file = File::open("/dev/null").unwrap();
+        let original = NativeHandle::new(vec![file.into()], &[42]).unwrap();
+        assert_eq!(original.ints(), &[42]);
+        assert_eq!(original.fds().len(), 1);
+
+        let aidl = AidlNativeHandle::from(original);
+        assert_eq!(&aidl.ints, &[42]);
+        assert_eq!(aidl.fds.len(), 1);
+
+        let converted_back = NativeHandle::from(aidl);
+        assert_eq!(converted_back.ints(), &[42]);
+        assert_eq!(converted_back.fds().len(), 1);
+    }
 }