1 files changed, 14 insertions, 2 deletions

diff --git a/src/MessagePack/StringEncoding.cs b/src/MessagePack/StringEncoding.cs
index dfde7d40..caa6336d 100644
--- a/src/MessagePack/StringEncoding.cs
+++ b/src/MessagePack/StringEncoding.cs
@@ -1,9 +1,21 @@
-using System.Text;
+using System;
+using System.Text;
 
 namespace MessagePack
 {
     internal static class StringEncoding
     {
-        public static readonly Encoding UTF8 = new UTF8Encoding(false);
+        internal static readonly Encoding UTF8 = new UTF8Encoding(false);
+
+        internal static unsafe int GetBytes(this Encoding encoding, ReadOnlySpan<char> chars, Span<byte> bytes)
+        {
+            fixed (char* pChars = &chars[0])
+            fixed (byte* pBytes = &bytes[0])
+            {
+                return encoding.GetBytes(pChars, chars.Length, pBytes, bytes.Length);
+            }
+        }
+
+        internal static unsafe int GetBytes(this Encoding encoding, string chars, Span<byte> bytes) => GetBytes(encoding, chars.AsSpan(), bytes);
     }
 }