CSharp08.Program.saveText C# (CSharp) Метод

        static bool saveText(string path, string text)
        {
            byte[] bytes = Encoding.Default.GetBytes(text);

            Bitmap bm = null;
            using (Image img = Image.FromFile(path))
            {
                bm = new Bitmap(img);
            }
            if (bm.Width * bm.Height * 3 / 8 < bytes.Length + 4) return false;

            bytes = HEADER.Concat(bytes).ToArray();
            {
                byte[] newBytes = new byte[bm.Width * bm.Height * 3 / 8];
                Array.Copy(bytes, newBytes, bytes.Length);
                bytes = newBytes;
            }
            BitArray a = new BitArray(bytes);

            BitmapData data = bm.LockBits(new Rectangle(0, 0, bm.Width, bm.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            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 = (bm.Width * y + x) * 3;
                        if (bitArrayIdx < a.Length) if (a[bitArrayIdx]) p[0] |= 1; else p[0] &= 0xfe;
                        ++bitArrayIdx;
                        if (bitArrayIdx < a.Length) if (a[bitArrayIdx]) p[1] |= 1; else p[1] &= 0xfe;
                        ++bitArrayIdx;
                        if (bitArrayIdx < a.Length) if (a[bitArrayIdx]) p[2] |= 1; else p[2] &= 0xfe;
                        p += 3;
                    }
                }
            }

            bm.UnlockBits(data);
            bm.Save("_" + path);
            bm.Dispose();

            return true;
        }