James Newton-King | 79f5bad | 2020-06-24 16:02:13 +1200 | [diff] [blame] | 1 | #region Copyright notice and license |
| 2 | // Protocol Buffers - Google's data interchange format |
| 3 | // Copyright 2008 Google Inc. All rights reserved. |
| 4 | // https://developers.google.com/protocol-buffers/ |
| 5 | // |
| 6 | // Redistribution and use in source and binary forms, with or without |
| 7 | // modification, are permitted provided that the following conditions are |
| 8 | // met: |
| 9 | // |
| 10 | // * Redistributions of source code must retain the above copyright |
| 11 | // notice, this list of conditions and the following disclaimer. |
| 12 | // * Redistributions in binary form must reproduce the above |
| 13 | // copyright notice, this list of conditions and the following disclaimer |
| 14 | // in the documentation and/or other materials provided with the |
| 15 | // distribution. |
| 16 | // * Neither the name of Google Inc. nor the names of its |
| 17 | // contributors may be used to endorse or promote products derived from |
| 18 | // this software without specific prior written permission. |
| 19 | // |
| 20 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | #endregion |
| 32 | |
| 33 | using System; |
| 34 | using System.IO; |
| 35 | using System.Threading; |
| 36 | using System.Threading.Tasks; |
| 37 | |
| 38 | namespace Google.Protobuf |
| 39 | { |
| 40 | /// <summary> |
| 41 | /// SecuritySafeCritical attribute can not be placed on types with async methods. |
| 42 | /// This class has ByteString's async methods so it can be marked with SecuritySafeCritical. |
| 43 | /// </summary> |
| 44 | internal static class ByteStringAsync |
| 45 | { |
| 46 | #if !NET35 |
| 47 | internal static async Task<ByteString> FromStreamAsyncCore(Stream stream, CancellationToken cancellationToken) |
| 48 | { |
| 49 | int capacity = stream.CanSeek ? checked((int)(stream.Length - stream.Position)) : 0; |
| 50 | var memoryStream = new MemoryStream(capacity); |
| 51 | // We have to specify the buffer size here, as there's no overload accepting the cancellation token |
| 52 | // alone. But it's documented to use 81920 by default if not specified. |
| 53 | await stream.CopyToAsync(memoryStream, 81920, cancellationToken); |
James Newton-King | e794919 | 2020-11-18 22:54:06 +1300 | [diff] [blame] | 54 | #if NETSTANDARD1_1 |
James Newton-King | 79f5bad | 2020-06-24 16:02:13 +1200 | [diff] [blame] | 55 | byte[] bytes = memoryStream.ToArray(); |
| 56 | #else |
| 57 | // Avoid an extra copy if we can. |
| 58 | byte[] bytes = memoryStream.Length == memoryStream.Capacity ? memoryStream.GetBuffer() : memoryStream.ToArray(); |
| 59 | #endif |
| 60 | return ByteString.AttachBytes(bytes); |
| 61 | } |
| 62 | #endif |
| 63 | } |
| 64 | } |