64 lines
2.9 KiB
C#
64 lines
2.9 KiB
C#
#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#endregion
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using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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namespace LC.Google.Protobuf
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{
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/// <summary>
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/// SecuritySafeCritical attribute can not be placed on types with async methods.
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/// This class has ByteString's async methods so it can be marked with SecuritySafeCritical.
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/// </summary>
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internal static class ByteStringAsync
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{
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#if !NET35
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internal static async Task<ByteString> FromStreamAsyncCore(Stream stream, CancellationToken cancellationToken)
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{
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int capacity = stream.CanSeek ? checked((int)(stream.Length - stream.Position)) : 0;
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var memoryStream = new MemoryStream(capacity);
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// We have to specify the buffer size here, as there's no overload accepting the cancellation token
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// alone. But it's documented to use 81920 by default if not specified.
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await stream.CopyToAsync(memoryStream, 81920, cancellationToken);
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#if NETSTANDARD1_1
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byte[] bytes = memoryStream.ToArray();
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#else
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// Avoid an extra copy if we can.
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byte[] bytes = memoryStream.Length == memoryStream.Capacity ? memoryStream.GetBuffer() : memoryStream.ToArray();
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#endif
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return ByteString.AttachBytes(bytes);
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}
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#endif
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}
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} |