LitS3.S3Service.CopyStream C# (CSharp) Method

        static void CopyStream(Stream source, Stream dest, long length, Action<long> progressCallback)
        {
            var buffer = new byte[8192];

            if (progressCallback != null)
                progressCallback(0);

            long totalBytesRead = 0;
            while (totalBytesRead < length) // reuse this local var
            {
                int bytesRead = source.Read(buffer, 0, buffer.Length);

                if (bytesRead > 0)
                    dest.Write(buffer, 0, bytesRead);
                else
                    throw new Exception("Unexpected end of stream while copying.");

                totalBytesRead += bytesRead;

                if (progressCallback != null)
                    progressCallback(totalBytesRead);
            }
        }