CSharp08.Program.loadText C# (CSharp) Метод

        static string loadText(string path)
        {
            Bitmap bm = null;
            using (Image img = Image.FromFile(path))
            {
                bm = new Bitmap(img);
            }
            BitmapData data = bm.LockBits(new Rectangle(0, 0, bm.Width, bm.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);

            BitArray a = new BitArray(bm.Width * bm.Height * 3 / 8 * 8);

            unsafe
            {
                for (int y = 0; y < bm.Height; ++y)
                {
                    byte *p = (byte*)data.Scan0.ToPointer() + data.Stride * y;
                    for (int x = 0; x < bm.Width; ++x)
                    {
                        int bitArrayIdx = (y * bm.Width + x) * 3;
                        if (bitArrayIdx < a.Length) a[bitArrayIdx] = (p[0] & 1) == 1;
                        ++bitArrayIdx;
                        if (bitArrayIdx < a.Length) a[bitArrayIdx] = (p[1] & 1) == 1;
                        ++bitArrayIdx;
                        if (bitArrayIdx < a.Length) a[bitArrayIdx] = (p[2] & 1) == 1;
                        p += 3;
                    }
                }
            }

            bm.UnlockBits(data);

            byte[] bytes = new byte[bm.Width * bm.Height * 3 / 8];
            a.CopyTo(bytes, 0);

            bool yes = bytes.Take(4).Select((v, i) => v == HEADER[i]).All(i => i);
            if (!yes) return "";

            bm.Dispose();

            bytes = bytes.Skip(4).ToArray();
            bytes = bytes.Take(Array.IndexOf(bytes, (byte)0)).ToArray();

            return Encoding.Default.GetString(bytes);
        }