copy stream to stream

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public static void CopyStream(Stream input, Stream output)
{
    int bufferSize = 4096;
    byte[] buffer = new byte[bufferSize];
    while (true)
    {
        int read = input.Read(buffer, 0, buffer.Length);
        if (read <= 0)
        {
            return;
        }
        output.Write(buffer, 0, read);
    }
}

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