init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Utilities/IO/TeeInputStream.cs

@@ -0,0 +1,43 @@
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.IO;
+
+public class TeeInputStream : BaseInputStream
+{
+	private readonly Stream input;
+
+	private readonly Stream tee;
+
+	public TeeInputStream(Stream input, Stream tee)
+	{
+		this.input = input;
+		this.tee = tee;
+	}
+
+	public override void Close()
+	{
+		Platform.Dispose(input);
+		Platform.Dispose(tee);
+		base.Close();
+	}
+
+	public override int Read(byte[] buf, int off, int len)
+	{
+		int num = input.Read(buf, off, len);
+		if (num > 0)
+		{
+			tee.Write(buf, off, num);
+		}
+		return num;
+	}
+
+	public override int ReadByte()
+	{
+		int num = input.ReadByte();
+		if (num >= 0)
+		{
+			tee.WriteByte((byte)num);
+		}
+		return num;
+	}
+}