SetiDecryptChallenge-1.cs

using System;
using System.Linq;
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

namespace CrackTheCode
{
	class MainClass
	{
		public static void Main (string[] args)
		{ 
			FileStream fs = new FileStream ("../../SETI_message.txt", FileMode.Open, FileAccess.Read); 
			int w = 359;
			int h = 757; 
			int c = 0;
			int offset = 0;
			byte[] arr = new byte[w * h];
			int n = 0;
			while ((c = fs.Read (arr, 0, w * h)) > 0) {
				offset += c;
				n++;
				using (var img = new Bitmap (w, h)) {
					for (int i = 0; i < w; i++) {
						for (int j = 0; j < h; j++) {
							int b = arr [j * w + i] - '0';
							img.SetPixel (i, j, b == 0 ? Color.White : Color.Black);
						}
					}
					img.Save ($"output-{n}.png", ImageFormat.Png);
				}

				arr = new byte[w * h];
			}
		}
	}
}