From 2bddeb867856f96060971945884424fe16c637f7 Mon Sep 17 00:00:00 2001
From: Colin Finck <colin@reactos.org>
Date: Mon, 26 Jul 2021 19:05:54 +0200
Subject: Implement `NtfsFileReference` to replace an opaque u64.

---
 src/file_reference.rs              | 21 +++++++++++++++++++++
 src/lib.rs                         |  2 ++
 src/structured_values/file_name.rs |  3 ++-
 3 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 src/file_reference.rs

diff --git a/src/file_reference.rs b/src/file_reference.rs
new file mode 100644
index 0000000..337d7c5
--- /dev/null
+++ b/src/file_reference.rs
@@ -0,0 +1,21 @@
+// Copyright 2021 Colin Finck <colin@reactos.org>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+use binread::BinRead;
+
+#[derive(BinRead, Clone, Debug)]
+pub struct NtfsFileReference(u64);
+
+impl NtfsFileReference {
+    pub(crate) const fn new(file_reference_data: u64) -> Self {
+        Self(file_reference_data)
+    }
+
+    pub fn file_record_number(&self) -> u64 {
+        self.0 >> 16
+    }
+
+    pub fn sequence_number(&self) -> u16 {
+        self.0 as u16
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 30548c3..487ac50 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,6 +13,7 @@ mod attribute;
 mod attribute_value;
 mod boot_sector;
 mod error;
+mod file_reference;
 mod guid;
 mod index;
 mod index_entry;
@@ -29,6 +30,7 @@ mod types;
 pub use crate::attribute::*;
 pub use crate::attribute_value::*;
 pub use crate::error::*;
+pub use crate::file_reference::*;
 pub use crate::guid::*;
 pub use crate::index::*;
 pub use crate::ntfs::*;
diff --git a/src/structured_values/file_name.rs b/src/structured_values/file_name.rs
index 96fcf92..a98aff1 100644
--- a/src/structured_values/file_name.rs
+++ b/src/structured_values/file_name.rs
@@ -3,6 +3,7 @@
 
 use crate::attribute::NtfsAttributeType;
 use crate::error::{NtfsError, Result};
+use crate::file_reference::NtfsFileReference;
 use crate::string::NtfsString;
 use crate::structured_values::{
     NtfsFileAttributeFlags, NtfsStructuredValue, NtfsStructuredValueFromData,
@@ -23,7 +24,7 @@ const FILE_NAME_MIN_SIZE: usize = FILE_NAME_HEADER_SIZE + mem::size_of::<u16>();
 #[allow(unused)]
 #[derive(BinRead, Clone, Debug)]
 struct FileNameHeader {
-    parent_directory_ref: u64,
+    parent_directory_ref: NtfsFileReference,
     creation_time: NtfsTime,
     modification_time: NtfsTime,
     mft_record_modification_time: NtfsTime,
-- 
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