DocSpace-client/common/ASC.Common/Data/TempStream.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2021
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/

namespace ASC.Common;

[Singletone]
public class TempStream
{
    private readonly TempPath _tempPath;

    public TempStream(TempPath tempPath) => _tempPath = tempPath;

    public Stream GetBuffered(Stream srcStream)
    {
        if (srcStream == null) throw new ArgumentNullException(nameof(srcStream));

        if (!srcStream.CanSeek || srcStream.CanTimeout)
        {
            //Buffer it
            var memStream = Create();
            srcStream.CopyTo(memStream);
            memStream.Position = 0;

            return memStream;
        }

        return srcStream;
    }

    public Stream Create() => new FileStream(_tempPath.GetTempFileName(), FileMode.OpenOrCreate,
        FileAccess.ReadWrite, FileShare.Read, 4096, FileOptions.DeleteOnClose);
}