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MareSynchronosServer/MareSynchronosStaticFilesServer/Utils/TeeStream.cs

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+namespace MareSynchronosStaticFilesServer.Utils;
+
+// Writes data read from one stream out to a second stream
+public class TeeStream : Stream
+{
+    private readonly Stream _inStream;
+    private readonly Stream _outStream;
+    public bool DisposeUnderlying = true;
+
+    public Stream InStream { get => _inStream; }
+    public Stream OutStream { get => _outStream; }
+
+    public TeeStream(Stream inStream, Stream outStream)
+    {
+        _inStream = inStream;
+        _outStream = outStream;
+    }
+
+    protected override void Dispose(bool disposing)
+    {
+        if (!DisposeUnderlying)
+            return;
+        _inStream.Dispose();
+        _outStream.Dispose();
+    }
+
+    public override bool CanRead => _inStream.CanRead;
+    public override bool CanSeek => _inStream.CanSeek;
+    public override bool CanWrite => false;
+    public override long Length => _inStream.Length;
+
+    public override long Position
+    {
+        get => _inStream.Position;
+        set => _inStream.Position = value;
+    }
+
+    public override void Flush()
+    {
+        _inStream.Flush();
+        _outStream.Flush();
+    }
+
+    public override int Read(byte[] buffer, int offset, int count)
+    {
+        int n = _inStream.Read(buffer, offset, count);
+        if (n > 0)
+            _outStream.Write(buffer, offset, n);
+        return n;
+    }
+
+    public async override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+    {
+        int n = await _inStream.ReadAsync(buffer, offset, count, cancellationToken);
+        if (n > 0)
+            await _outStream.WriteAsync(buffer, offset, n);
+        return n;
+    }
+
+    public override long Seek(long offset, SeekOrigin origin)
+    {
+        return _inStream.Seek(offset, origin);
+    }
+
+    public override void SetLength(long value)
+    {
+        _inStream.SetLength(value);
+    }
+
+    public override void Write(byte[] buffer, int offset, int count)
+    {
+        throw new NotSupportedException();
+    }
+}