add all

Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/util/Spans.cs

@@ -0,0 +1,46 @@
+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+using System;
+using System.Runtime.CompilerServices;
+
+//#nullable enable
+
+namespace Best.HTTP.SecureProtocol.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
+#pragma warning restore
+#endif