FlassetReplacer (SWF asset replacer using Flazzy)

Program.cs

using Flazzy;
using Flazzy.Tags;
using System.Drawing;
using System.IO;
using System.Linq;

namespace FlassetReplacer
{
    class Program
    {
        private static bool Exporting = false;
        private static bool Replacing = false;

        static void Main(string[] args)
        {
            var flash = new ShockwaveFlash("Habbo.swf");
            flash.Disassemble();

            // Export if "out" folder doesn't exist
            Exporting = !Directory.Exists("out");
            // Replace if "in" folder does exist
            Replacing = Directory.Exists("in");

            var images = flash.Tags.Where(t => t.Kind == TagKind.DefineBitsLossless2).Select(t => t as DefineBitsLossless2Tag).ToList();
            if (Exporting)
            {
                Directory.CreateDirectory("out");
                foreach (var imageTag in images)
                {
                    SaveARGBMap(imageTag.Id, imageTag.GetARGBMap());
                }
            }

            if (Replacing)
            {
                var inFiles = Directory.EnumerateFiles("in");
                foreach (var file in inFiles)
                {
                    var id = ushort.Parse(file.Split('\\')[1].Split('.')[0]);
                    images.First(t => t.Id == id).SetARGBMap(ReadARGBMap(file));
                }

                using (var f = new StreamWriter("new.swf"))
                {
                    flash.CopyTo(f.BaseStream, CompressionKind.LZMA);
                }
            }
        }

        private static void SaveARGBMap(ushort id, Color[,] map) => SaveARGBMap(id.ToString(), map);
        private static void SaveARGBMap(string filename, Color[,] map)
        {
            var width = map.GetLength(0);
            var height = map.GetLength(1);
            using (Bitmap pic = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
            {
                for (var x = 0; x < width; x++)
                {
                    for (var y = 0; y < height; y++)
                    {
                        Color c = map[x, y];
                        pic.SetPixel(x, y, c);
                    }
                }

                pic.Save("out\\" + filename + ".png");
            }
        }

        private static Color[,] ReadARGBMap(string filename)
        {
            Bitmap img = new Bitmap(filename);
            Color[,] map = new Color[img.Width, img.Height];
            for (int i = 0; i < img.Width; i++)
            {
                for (int j = 0; j < img.Height; j++)
                {
                    map[i,j] = img.GetPixel(i, j);
                }
            }

            return map;
        }
    }
}