From dbf0b2ecade96c9450aea876bff42918a8c1637a Mon Sep 17 00:00:00 2001
From: Ashley Mannix <kodraus@hey.com>
Date: Sun, 31 Oct 2021 18:41:33 +1000
Subject: [PATCH] don't flip GUID fields when converting to UUID

---
 Cargo.toml            |  4 ++++
 src/winapi_support.rs | 48 ++++++++++++++++++++++++++++++++++++-------
 2 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 0fb1cc3..d8a4da8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -126,3 +126,7 @@ version = "0.2"
 
 [dev-dependencies.wasm-bindgen-test]
 version = "0.3"
+
+[target.'cfg(windows)'.dev-dependencies.winapi]
+version = "0.3"
+features = ["combaseapi"]
diff --git a/src/winapi_support.rs b/src/winapi_support.rs
index 8de2917..d6c3a83 100644
--- a/src/winapi_support.rs
+++ b/src/winapi_support.rs
@@ -4,11 +4,14 @@ use winapi::shared::guiddef;
 
 #[cfg(feature = "guid")]
 impl Uuid {
-    /// Converts a little endian winapi `GUID` into a [`Uuid`]
+    /// Converts a winapi `GUID` into a [`Uuid`]
+    ///
+    /// This method will pass fields unchanged, so they must already
+    /// be in the right endianness for a UUID.
     ///
     /// [`Uuid`]: ../struct.Uuid.html
     pub const fn from_guid(guid: guiddef::GUID) -> Self {
-        Uuid::from_fields_le(
+        Uuid::from_fields(
             guid.Data1 as u32,
             guid.Data2 as u16,
             guid.Data3 as u16,
@@ -16,11 +19,14 @@ impl Uuid {
         )
     }
 
-    /// Converts a [`Uuid`] into a little endian winapi `GUID`
+    /// Converts a [`Uuid`] into a winapi `GUID`
+    ///
+    /// This method will pass fields unchanged, so they must already
+    /// be in the right endianness for a UUID.
     ///
     /// [`Uuid`]: ../struct.Uuid.html
     pub fn to_guid(&self) -> guiddef::GUID {
-        let (data1, data2, data3, data4) = self.to_fields_le();
+        let (data1, data2, data3, data4) = self.as_fields();
 
         guiddef::GUID {
             Data1: data1,
@@ -36,8 +42,36 @@ impl Uuid {
 mod tests {
     use super::*;
 
-    use crate::std::string::ToString;
-    use winapi::shared::guiddef;
+    use crate::{std::string::ToString, Variant, Version};
+    use winapi::{shared::guiddef, um::combaseapi::CoCreateGuid};
+
+    #[test]
+    fn test_parse_guid() {
+        // This example GUID is directly from https://docs.microsoft.com/en-us/windows/win32/api/guiddef/ns-guiddef-guid
+        let uuid = Uuid::parse_str("6B29FC40-CA47-1067-B31D-00DD010662DA").unwrap();
+
+        assert_eq!(Variant::RFC4122, uuid.get_variant());
+        assert_eq!(Some(Version::Mac), uuid.get_version());
+    }
+
+    #[test]
+    fn test_new_native_guid() {
+        let mut guid = guiddef::GUID {
+            Data1: Default::default(),
+            Data2: Default::default(),
+            Data3: Default::default(),
+            Data4: Default::default(),
+        };
+    
+        unsafe {
+            CoCreateGuid(&mut guid as *mut _);
+        }
+    
+        let uuid = Uuid::from_guid(guid);
+    
+        assert_eq!(Variant::RFC4122, uuid.get_variant());
+        assert_eq!(Some(Version::Random), uuid.get_version());
+    }
 
     #[test]
     fn test_from_guid() {
@@ -50,7 +84,7 @@ mod tests {
 
         let uuid = Uuid::from_guid(guid);
         assert_eq!(
-            "9d22354a-2755-304f-8647-9dc54e1ee1e8",
+            "4a35229d-5527-4f30-8647-9dc54e1ee1e8",
             uuid.to_hyphenated().to_string()
         );
     }