1 files changed, 54 insertions, 0 deletions
diff --git a/Crypto/src/util/io/TeeInputStream.cs b/Crypto/src/util/io/TeeInputStream.cs
new file mode 100644
index 000000000..fed9823f0
--- /dev/null
+++ b/Crypto/src/util/io/TeeInputStream.cs
@@ -0,0 +1,54 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.IO
+{
+ public class TeeInputStream
+ : BaseInputStream
+ {
+ private readonly Stream input, tee;
+
+ public TeeInputStream(Stream input, Stream tee)
+ {
+ Debug.Assert(input.CanRead);
+ Debug.Assert(tee.CanWrite);
+
+ this.input = input;
+ this.tee = tee;
+ }
+
+ protected override void Dispose(bool disposing)
+ {
+ if (disposing)
+ {
+ input.Dispose();
+ tee.Dispose();
+ }
+ }
+
+ public override int Read(byte[] buf, int off, int len)
+ {
+ int i = input.Read(buf, off, len);
+
+ if (i > 0)
+ {
+ tee.Write(buf, off, i);
+ }
+
+ return i;
+ }
+
+ public override int ReadByte()
+ {
+ int i = input.ReadByte();
+
+ if (i >= 0)
+ {
+ tee.WriteByte((byte)i);
+ }
+
+ return i;
+ }
+ }
+}
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