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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
namespace Microsoft.AspNetCore.DataProtection;
internal static class ArraySegmentExtensions
{
public static byte[] AsStandaloneArray(this ArraySegment<byte> arraySegment)
{
// Fast-track: Don't need to duplicate the array.
if (arraySegment.Offset == 0 && arraySegment.Count == arraySegment.Array!.Length)
{
return arraySegment.Array;
}
var retVal = new byte[arraySegment.Count];
Buffer.BlockCopy(arraySegment.Array!, arraySegment.Offset, retVal, 0, retVal.Length);
return retVal;
}
public static void Validate<T>(this ArraySegment<T> arraySegment)
{
// Since ArraySegment<T> is a struct, it can be improperly initialized or torn.
// We call the ctor again to make sure the instance data is valid.
_ = new ArraySegment<T>(arraySegment.Array!, arraySegment.Offset, arraySegment.Count);
}
}
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