/* * * (c) Copyright Ascensio System Limited 2010-2018 * * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights. * * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html * * You can contact Ascensio System SIA by email at sales@onlyoffice.com * * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3. * * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains * relevant author attributions when distributing the software. If the display of the logo in its graphic * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" * in every copy of the program you distribute. * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks. * */ using System; using System.IO; using System.Threading.Tasks; using ASC.Data.Storage; public static class StreamExtension { private const int BufferSize = 2048; //NOTE: set to 2048 to fit in minimum tcp window public static Stream GetBuffered(this Stream srcStream) { if (srcStream == null) throw new ArgumentNullException(nameof(srcStream)); if (!srcStream.CanSeek || srcStream.CanTimeout) { //Buffer it var memStream = TempStream.Create(); srcStream.StreamCopyTo(memStream); memStream.Position = 0; return memStream; } return srcStream; } public static byte[] GetCorrectBuffer(this Stream stream) { if (stream == null) { throw new ArgumentNullException(nameof(stream)); } using var mem = stream.GetBuffered(); var buffer = new byte[mem.Length]; mem.Position = 0; mem.Read(buffer, 0, buffer.Length); return buffer; } public static void StreamCopyTo(this Stream srcStream, Stream dstStream) { if (srcStream == null) throw new ArgumentNullException(nameof(srcStream)); if (dstStream == null) throw new ArgumentNullException(nameof(dstStream)); var buffer = new byte[BufferSize]; int readed; while ((readed = srcStream.Read(buffer, 0, BufferSize)) > 0) { dstStream.Write(buffer, 0, readed); } } public static async Task StreamCopyToAsync(this Stream srcStream, Stream dstStream) { if (srcStream == null) throw new ArgumentNullException(nameof(srcStream)); if (dstStream == null) throw new ArgumentNullException(nameof(dstStream)); var buffer = new byte[BufferSize]; int readed; while ((readed = await srcStream.ReadAsync(buffer, 0, BufferSize)) > 0) { await dstStream.WriteAsync(buffer, 0, readed); } } public static void StreamCopyTo(this Stream srcStream, Stream dstStream, int length) { if (srcStream == null) throw new ArgumentNullException(nameof(srcStream)); if (dstStream == null) throw new ArgumentNullException(nameof(dstStream)); var buffer = new byte[BufferSize]; var totalRead = 0; int readed; while ((readed = srcStream.Read(buffer, 0, length - totalRead > BufferSize ? BufferSize : length - totalRead)) > 0 && totalRead < length) { dstStream.Write(buffer, 0, readed); totalRead += readed; } } }