Add trait implementations for Rust binder crate

Implements Error for StatusCode in the bindgen generated bindings, which
makes usage simpler. Implements Eq for SpIBinder. Exposes a method to
promote weak binder references to strong ones.

Bug: 161559357
Test: m libbinder_rs
Change-Id: Ia2f891c2f0f84ed0454039169ed42ab20401c1a4
diff --git a/libs/binder/rust/src/error.rs b/libs/binder/rust/src/error.rs
index 289b157..4492cf7 100644
--- a/libs/binder/rust/src/error.rs
+++ b/libs/binder/rust/src/error.rs
@@ -43,14 +43,6 @@
     }
 }
 
-// impl Display for StatusCode {
-//     fn fmt(&self, f: &mut Formatter) -> FmtResult {
-//         write!(f, "StatusCode::{:?}", self)
-//     }
-// }
-
-// impl error::Error for StatusCode {}
-
 fn parse_status_code(code: i32) -> StatusCode {
     match code {
         e if e == StatusCode::OK as i32 => StatusCode::OK,
diff --git a/libs/binder/rust/src/lib.rs b/libs/binder/rust/src/lib.rs
index 4b9cccf..8ee6a62 100644
--- a/libs/binder/rust/src/lib.rs
+++ b/libs/binder/rust/src/lib.rs
@@ -102,7 +102,7 @@
 mod native;
 mod state;
 
-use binder_ndk_bindgen as sys;
+use binder_ndk_sys as sys;
 
 pub mod parcel;
 
diff --git a/libs/binder/rust/src/proxy.rs b/libs/binder/rust/src/proxy.rs
index f9519b4..13e5619 100644
--- a/libs/binder/rust/src/proxy.rs
+++ b/libs/binder/rust/src/proxy.rs
@@ -122,6 +122,14 @@
     }
 }
 
+impl PartialEq for SpIBinder {
+    fn eq(&self, other: &Self) -> bool {
+        ptr::eq(self.0, other.0)
+    }
+}
+
+impl Eq for SpIBinder {}
+
 impl Clone for SpIBinder {
     fn clone(&self) -> Self {
         unsafe {
@@ -363,6 +371,18 @@
         assert!(!ptr.is_null());
         Self(ptr)
     }
+
+    /// Promote this weak reference to a strong reference to the binder object.
+    pub fn promote(&self) -> Option<SpIBinder> {
+        unsafe {
+            // Safety: `WpIBinder` always contains a valid weak reference, so we
+            // can pass this pointer to `AIBinder_Weak_promote`. Returns either
+            // null or an AIBinder owned by the caller, both of which are valid
+            // to pass to `SpIBinder::from_raw`.
+            let ptr = sys::AIBinder_Weak_promote(self.0);
+            SpIBinder::from_raw(ptr)
+        }
+    }
 }
 
 /// Rust wrapper around DeathRecipient objects.