1 files changed, 19 insertions, 0 deletions
diff --git a/gfx/wr/peek-poke/src/slice_ext.rs b/gfx/wr/peek-poke/src/slice_ext.rs
new file mode 100644
index 0000000000..f309d2f741
--- /dev/null
+++ b/gfx/wr/peek-poke/src/slice_ext.rs
@@ -0,0 +1,19 @@
+// Copyright 2019 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// 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. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub trait AsEndMutPtr<T> {
+    fn as_end_mut_ptr(self) -> *mut T;
+}
+
+impl<'a> AsEndMutPtr<u8> for &'a mut [u8] {
+    fn as_end_mut_ptr(self) -> *mut u8 {
+        unsafe { self.as_mut_ptr().add(self.len()) }
+    }
+}