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#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
using System;
using System.Runtime.CompilerServices;
#nullable enable
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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