public static void Copy()

in src/ICSharpCode.SharpZipLib/Core/StreamUtils.cs [193:276]
69 lines of code
12 McCabe index (conditional complexity)

		public static void Copy(Stream source, Stream destination,
			byte[] buffer,
			ProgressHandler progressHandler, TimeSpan updateInterval,
			object sender, string name, long fixedTarget)
		{
			if (source == null)
			{
				throw new ArgumentNullException(nameof(source));
			}

			if (destination == null)
			{
				throw new ArgumentNullException(nameof(destination));
			}

			if (buffer == null)
			{
				throw new ArgumentNullException(nameof(buffer));
			}

			// Ensure a reasonable size of buffer is used without being prohibitive.
			if (buffer.Length < 128)
			{
				throw new ArgumentException("Buffer is too small", nameof(buffer));
			}

			if (progressHandler == null)
			{
				throw new ArgumentNullException(nameof(progressHandler));
			}

			bool copying = true;

			DateTime marker = DateTime.Now;
			long processed = 0;
			long target = 0;

			if (fixedTarget >= 0)
			{
				target = fixedTarget;
			}
			else if (source.CanSeek)
			{
				target = source.Length - source.Position;
			}

			// Always fire 0% progress..
			var args = new ProgressEventArgs(name, processed, target);
			progressHandler(sender, args);

			bool progressFired = true;

			while (copying)
			{
				int bytesRead = source.Read(buffer, 0, buffer.Length);
				if (bytesRead > 0)
				{
					processed += bytesRead;
					progressFired = false;
					destination.Write(buffer, 0, bytesRead);
				}
				else
				{
					destination.Flush();
					copying = false;
				}

				if (DateTime.Now - marker > updateInterval)
				{
					progressFired = true;
					marker = DateTime.Now;
					args = new ProgressEventArgs(name, processed, target);
					progressHandler(sender, args);

					copying = args.ContinueRunning;
				}
			}

			if (!progressFired)
			{
				args = new ProgressEventArgs(name, processed, target);
				progressHandler(sender, args);
			}
		}