From bf3678ca81204f8ea9c253cc35a96c6c7ce12b42 Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Sat, 8 Oct 2022 20:06:43 +0700
Subject: New Spans methods

---
 crypto/src/util/Spans.cs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'crypto/src/util')

diff --git a/crypto/src/util/Spans.cs b/crypto/src/util/Spans.cs
index 5e1b3737c..fa2b768d9 100644
--- a/crypto/src/util/Spans.cs
+++ b/crypto/src/util/Spans.cs
@@ -8,11 +8,35 @@ namespace Org.BouncyCastle.Utilities
 {
     internal static class Spans
     {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal static void CopyFrom<T>(this Span<T> output, ReadOnlySpan<T> input)
+        {
+            input[..output.Length].CopyTo(output);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal static Span<T> FromNullable<T>(T[]? array)
+        {
+            return array == null ? Span<T>.Empty : array.AsSpan();
+        }
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal static Span<T> FromNullable<T>(T[]? array, int start)
         {
             return array == null ? Span<T>.Empty : array.AsSpan(start);
         }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal static ReadOnlySpan<T> FromNullableReadOnly<T>(T[]? array)
+        {
+            return array == null ? Span<T>.Empty : array.AsSpan();
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        internal static ReadOnlySpan<T> FromNullableReadOnly<T>(T[]? array, int start)
+        {
+            return array == null ? Span<T>.Empty : array.AsSpan(start);
+        }
     }
 }
 #endif
-- 
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