1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/rust/miow-0.2.1/src/overlapped.rs b/third_party/rust/miow-0.2.1/src/overlapped.rs
new file mode 100644
index 0000000000..eade553dc5
--- /dev/null
+++ b/third_party/rust/miow-0.2.1/src/overlapped.rs
@@ -0,0 +1,66 @@
+use std::mem;
+
+use winapi::*;
+
+/// A wrapper around `OVERLAPPED` to provide "rustic" accessors and
+/// initializers.
+#[derive(Debug)]
+pub struct Overlapped(OVERLAPPED);
+
+unsafe impl Send for Overlapped {}
+unsafe impl Sync for Overlapped {}
+
+impl Overlapped {
+    /// Creates a new zeroed out instance of an overlapped I/O tracking state.
+    ///
+    /// This is suitable for passing to methods which will then later get
+    /// notified via an I/O Completion Port.
+    pub fn zero() -> Overlapped {
+        Overlapped(unsafe { mem::zeroed() })
+    }
+
+    /// Creates a new `Overlapped` function pointer from the underlying
+    /// `OVERLAPPED`, wrapping in the "rusty" wrapper for working with
+    /// accessors.
+    ///
+    /// # Unsafety
+    ///
+    /// This function doesn't validate `ptr` nor the lifetime of the returned
+    /// pointer at all, it's recommended to use this method with extreme
+    /// caution.
+    pub unsafe fn from_raw<'a>(ptr: *mut OVERLAPPED) -> &'a mut Overlapped {
+        &mut *(ptr as *mut Overlapped)
+    }
+
+    /// Gain access to the raw underlying data
+    pub fn raw(&self) -> *mut OVERLAPPED {
+        &self.0 as *const _ as *mut _
+    }
+
+    /// Sets the offset inside this overlapped structure.
+    ///
+    /// Note that for I/O operations in general this only has meaning for I/O
+    /// handles that are on a seeking device that supports the concept of an
+    /// offset.
+    pub fn set_offset(&mut self, offset: u64) {
+        self.0.Offset = offset as u32;
+        self.0.OffsetHigh = (offset >> 32) as u32;
+    }
+
+    /// Reads the offset inside this overlapped structure.
+    pub fn offset(&self) -> u64 {
+        (self.0.Offset as u64) | ((self.0.OffsetHigh as u64) << 32)
+    }
+
+    /// Sets the `hEvent` field of this structure.
+    ///
+    /// The event specified can be null.
+    pub fn set_event(&mut self, event: HANDLE) {
+        self.0.hEvent = event;
+    }
+
+    /// Reads the `hEvent` field of this structure, may return null.
+    pub fn event(&self) -> HANDLE {
+        self.0.hEvent
+    }
+}