1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/rust/uuid/src/winapi_support.rs b/third_party/rust/uuid/src/winapi_support.rs
new file mode 100644
index 0000000000..e11ccde6e0
--- /dev/null
+++ b/third_party/rust/uuid/src/winapi_support.rs
@@ -0,0 +1,79 @@
+use crate::prelude::*;
+use winapi::shared::guiddef;
+
+#[cfg(feature = "guid")]
+impl Uuid {
+    /// Attempts to create a [`Uuid`] from a little endian winapi `GUID`
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    pub fn from_guid(guid: guiddef::GUID) -> Result<Uuid, crate::Error> {
+        Uuid::from_fields_le(
+            guid.Data1 as u32,
+            guid.Data2 as u16,
+            guid.Data3 as u16,
+            &(guid.Data4 as [u8; 8]),
+        )
+    }
+
+    /// Converts a [`Uuid`] into a little endian winapi `GUID`
+    ///
+    /// [`Uuid`]: ../struct.Uuid.html
+    pub fn to_guid(&self) -> guiddef::GUID {
+        let (data1, data2, data3, data4) = self.to_fields_le();
+
+        guiddef::GUID {
+            Data1: data1,
+            Data2: data2,
+            Data3: data3,
+            Data4: *data4,
+        }
+    }
+}
+
+#[cfg(feature = "guid")]
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::std::string::ToString;
+    use winapi::shared::guiddef;
+
+    #[test]
+    fn test_from_guid() {
+        let guid = guiddef::GUID {
+            Data1: 0x4a35229d,
+            Data2: 0x5527,
+            Data3: 0x4f30,
+            Data4: [0x86, 0x47, 0x9d, 0xc5, 0x4e, 0x1e, 0xe1, 0xe8],
+        };
+
+        let uuid = Uuid::from_guid(guid).unwrap();
+        assert_eq!(
+            "9d22354a-2755-304f-8647-9dc54e1ee1e8",
+            uuid.to_hyphenated().to_string()
+        );
+    }
+
+    #[test]
+    fn test_guid_roundtrip() {
+        let guid_in = guiddef::GUID {
+            Data1: 0x4a35229d,
+            Data2: 0x5527,
+            Data3: 0x4f30,
+            Data4: [0x86, 0x47, 0x9d, 0xc5, 0x4e, 0x1e, 0xe1, 0xe8],
+        };
+
+        let uuid = Uuid::from_guid(guid_in).unwrap();
+        let guid_out = uuid.to_guid();
+
+        assert_eq!(
+            (guid_in.Data1, guid_in.Data2, guid_in.Data3, guid_in.Data4),
+            (
+                guid_out.Data1,
+                guid_out.Data2,
+                guid_out.Data3,
+                guid_out.Data4
+            )
+        );
+    }
+}