Replace ToAsciiBytes with UTF8Encoder

src/ImageSharp/Formats/Jpeg/Common/Decoder/ProfileResolver.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
+using System.Text;
 
 namespace SixLabors.ImageSharp.Formats.Jpeg.Common.Decoder
 {
@@ -13,22 +14,22 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Common.Decoder
         /// <summary>
         /// Describes the EXIF specific markers
         /// </summary>
-        public static readonly byte[] JFifMarker = ToAsciiBytes("JFIF\0");
+        public static readonly byte[] JFifMarker = Encoding.UTF8.GetBytes("JFIF\0");
 
         /// <summary>
         /// Describes the EXIF specific markers
         /// </summary>
-        public static readonly byte[] IccMarker = ToAsciiBytes("ICC_PROFILE\0");
+        public static readonly byte[] IccMarker = Encoding.UTF8.GetBytes("ICC_PROFILE\0");
 
         /// <summary>
         /// Describes the ICC specific markers
         /// </summary>
-        public static readonly byte[] ExifMarker = ToAsciiBytes("Exif\0\0");
+        public static readonly byte[] ExifMarker = Encoding.UTF8.GetBytes("Exif\0\0");
 
         /// <summary>
         /// Describes Adobe specific markers <see href="http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe"/>
         /// </summary>
-        public static readonly byte[] AdobeMarker = ToAsciiBytes("Adobe");
+        public static readonly byte[] AdobeMarker = Encoding.UTF8.GetBytes("Adobe");
 
         /// <summary>
         /// Returns a value indicating whether the passed bytes are a match to the profile identifer
@@ -41,19 +42,5 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Common.Decoder
             return bytesToCheck.Length >= profileIdentifier.Length
                    && bytesToCheck.Slice(0, profileIdentifier.Length).SequenceEqual(profileIdentifier);
         }
-
-        // No Encoding.ASCII nor Linq.Select on NetStandard 1.1
-        private static byte[] ToAsciiBytes(string str)
-        {
-            int length = str.Length;
-            byte[] bytes = new byte[length];
-            char[] chars = str.ToCharArray();
-            for (int i = 0; i < length; i++)
-            {
-                bytes[i] = (byte)chars[i];
-            }
-
-            return bytes;
-        }
     }
 }