Refactored byte[] array in ExifConstants type

src/ImageSharp/Metadata/Profiles/Exif/ExifConstants.cs

@@ -1,11 +1,13 @@
-// Copyright (c) Six Labors and contributors.
+// Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
+using System;
+
 namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
 {
     internal static class ExifConstants
     {
-        public static readonly byte[] LittleEndianByteOrderMarker =
+        public static ReadOnlySpan<byte> LittleEndianByteOrderMarker => new byte[]
         {
             (byte)'I',
             (byte)'I',
@@ -13,7 +15,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             0x00,
         };
 
-        public static readonly byte[] BigEndianByteOrderMarker =
+        public static ReadOnlySpan<byte> BigEndianByteOrderMarker => new byte[]
         {
             (byte)'M',
             (byte)'M',
@@ -21,4 +23,4 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             0x2A
         };
     }
-}
+}

src/ImageSharp/Metadata/Profiles/Exif/ExifWriter.cs

@@ -77,7 +77,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             int i = 0;
 
             // The byte order marker for little-endian, followed by the number 42 and a 0
-            ExifConstants.LittleEndianByteOrderMarker.AsSpan().CopyTo(result.AsSpan(start: i));
+            ExifConstants.LittleEndianByteOrderMarker.CopyTo(result.AsSpan(start: i));
             i += ExifConstants.LittleEndianByteOrderMarker.Length;
 
             uint ifdOffset = ((uint)i - startIndex) + 4U;