41 lines
1.5 KiB
C#
41 lines
1.5 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc.
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// All Rights Reserved
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
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// WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
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// TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR
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// NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing
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// permissions and limitations under the License.
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using System;
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using System.Diagnostics;
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namespace Microsoft.AspNet.Security.DataProtection.Util
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{
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/// <summary>
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/// Defines helper methods for working with fixed expression blocks.
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/// </summary>
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internal static class ByteArrayExtensions
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{
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private static readonly byte[] _dummyBuffer = new byte[1];
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// Since the 'fixed' keyword turns a zero-length array into a pointer, we need
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// to make sure we're always providing a buffer of length >= 1 so that the
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// p/invoke methods we pass the pointers to don't see a null pointer. Callers
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// are still responsible for passing a proper length to the p/invoke routines.
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public static byte[] AsFixed(this byte[] buffer)
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{
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Debug.Assert(buffer != null);
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return (buffer.Length != 0) ? buffer : _dummyBuffer;
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}
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}
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}
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