From a3864c9de7aac2085cdfbfb181bac410583cb54f Mon Sep 17 00:00:00 2001
From: BobLd <38405645+BobLd@users.noreply.github.com>
Date: Sun, 14 Sep 2025 16:34:43 +0100
Subject: [PATCH] Use record struct in FileHeaderOffset

---
 .../Parser/FileStructure/FileHeaderOffset.cs     | 16 ++++++++--------
 .../Polyfills/IsExternalInitPoly.cs              |  6 ++++++
 2 files changed, 14 insertions(+), 8 deletions(-)
 create mode 100644 src/UglyToad.PdfPig/Polyfills/IsExternalInitPoly.cs

diff --git a/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderOffset.cs b/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderOffset.cs
index e6dc4dd19..5e1ad45b8 100644
--- a/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderOffset.cs
+++ b/src/UglyToad.PdfPig/Parser/FileStructure/FileHeaderOffset.cs
@@ -4,14 +4,14 @@
 /// How many bytes precede the "%PDF-" version header in the file. In some files this 'junk' can
 /// offset all following offset bytes.
 /// </summary>
-internal readonly struct FileHeaderOffset(int value)
+internal readonly record struct FileHeaderOffset(int Value) : IEquatable<FileHeaderOffset>
 {
-    public int Value => value;
+    public override string ToString() => Value.ToString();
+    
+    public bool Equals(FileHeaderOffset other)
+    {
+        return Value == other.Value;
+    }
 
-    public override string ToString() => value.ToString();
-
-    public override bool Equals(object? obj) =>
-        obj is FileHeaderOffset other && value == other.Value;
-
-    public override int GetHashCode() => value.GetHashCode();
+    public override int GetHashCode() => Value.GetHashCode();
 }
\ No newline at end of file
diff --git a/src/UglyToad.PdfPig/Polyfills/IsExternalInitPoly.cs b/src/UglyToad.PdfPig/Polyfills/IsExternalInitPoly.cs
new file mode 100644
index 000000000..58f64aa63
--- /dev/null
+++ b/src/UglyToad.PdfPig/Polyfills/IsExternalInitPoly.cs
@@ -0,0 +1,6 @@
+#if !NET
+namespace System.Runtime.CompilerServices
+{
+    internal static class IsExternalInit { }
+}
+#endif
\ No newline at end of file