【原創】一種將文本編碼爲圖片格式的方法

時間 2019-12-14

原文原文鏈接

世界上的文字能夠被四個字節徹底覆蓋，也就是UTF-32，其餘都是變長的格式。而剛好ARGB加起來四個字節，因而徹底能夠把一個字符映射爲一個像素點嘛！git

而且圖片上的字節能夠再次加密，很是好玩！我僅演示的超級無敵簡單的取反操做。dom

我本身習慣看方形的圖片，因而開平方取整，若是字符數量不足就從字符自己隨機取一段，這是爲了圖片尾部不會幾個像素留白，炒雞不美觀，以白色(0xFFFFFFFF)做爲終止字符。函數

static Bitmap ArgbTextEncode(string input)
        {
            var x = 0;
            var y = 0;
            var lenth = input.Length;
            var yValue = (int)(Math.Sqrt(input.Length) + 1);
            var fill = (yValue * yValue) % (Encoding.Unicode.GetByteCount(input) / 4);
            input += input.Substring(Rnd.random.Next(input.Length - fill - 1), fill);
            var image = new Bitmap(yValue, yValue);

            //fill
            for (int i = 0; i < yValue * yValue; i++)
            {
                if (i == lenth - 1)
                {
                    image.SetPixel(x, y, Color.White);
                }
                else
                {
                    byte[] bytes = Encoding.Unicode.GetBytes(input[i].ToString());
                    var prefix = 4 - bytes.Length;
                    bytes = Enumerable.Repeat<byte>(0, prefix).Concat(bytes).ToArray();
                    Encrypt(bytes);
                    image.SetPixel(x, y, Color.FromArgb(bytes[0], bytes[1], bytes[2], bytes[3]));
                }
                //Console.WriteLine("{0},{1} = {2}", x, y, input[i]);
                x++;
                if (x % yValue == 0)
                {
                    x = 0;
                    y++;
                }
            }
            return image;
        }

找了一個日誌文本，看看效果加密

解碼函數日誌

static string DecodeTextFromArgb(Bitmap image)
        {
            //ComplexImage comp = ComplexImage.FromBitmap(image);
            //comp.BackwardFourierTransform();
            var str = "";
            for (int i = 0; i < image.Height; i++)
            {
                for (int j = 0; j < image.Width; j++)
                {
                    var color = image.GetPixel(j, i);
                    if (color.A == 255 && color.R == 255 && color.G == 255 && color.B == 255)
                        return str;
                    var bytes = new byte[] { color.A, color.R, color.G, color.B };
                    Decrypt(bytes);
                    int skip = 0;
                    if (bytes[0] == 0)
                    {
                        if (bytes[1] == 0)
                        {
                            skip = 2;
                        }
                        else
                        {
                            skip = 1;
                        }
                    }
                    else
                    {
                        skip = 0;
                    }
                    var t = Encoding.Unicode.GetString(bytes.Skip(skip).ToArray());
                    //Console.WriteLine("{0},{1} = {2}", j, i, t);
                    str += t;
                }
            }
            return str;
        }

裏面用到的Encrypt和Decrypt是取反的，否則圖片一片漆黑，啥看不見。這句是我剛想到真的用取反操做符來，實際我是用的255去減的。code

unchecked((byte)~(byte)value)

Encrypt和Decrypt，其實同樣的。。哈哈orm

static byte[] Encrypt(byte[] values)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = (byte)(255 - values[i]);
            }
            return values;
        }
        static byte[] Decrypt(byte[] values)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = (byte)(255 - values[i]);
            }
            return values;
        }

本程序完整代碼以下：blog

class Program
    {
        static void Main(string[] args)
        {
            if (!args.Any())
            {
                return;
            }
            else if (args[0].EndsWith(".txt", StringComparison.OrdinalIgnoreCase))
            {
                var textRaw = File.ReadAllText(args[0], Encoding.Unicode);
                var image = ArgbTextEncode(textRaw);
                var imagePath = Path.ChangeExtension(args[0], ".png");
                image.Save(imagePath, ImageFormat.Png);
                image.Dispose();
                Console.WriteLine("TXT->PNG, " + imagePath);
                try
                {
                    Process.Start(imagePath);
                }
                catch
                {
                }
            }
            else if (args[0].EndsWith(".png", StringComparison.OrdinalIgnoreCase))
            {
                var image = (Bitmap)Bitmap.FromFile(args[0]);
                string text = "";
                try
                {
                    text = DecodeTextFromArgb(image);

                }
                catch (Exception ex)
                {
                    Console.WriteLine("PNG->TXT, 轉換失敗");
                    return;
                }
                var txtPath = Path.ChangeExtension(args[0], ".txt");
                File.WriteAllText(txtPath, text, Encoding.Unicode);
                Console.WriteLine("PNG->TXT, " + txtPath);
                try
                {
                    Process.Start(txtPath);
                }
                catch
                {
                }
            }
            else
            {
                Console.WriteLine("只支持TXT和PNG文件");
            }
        }

        static Bitmap ArgbTextEncode(string input)
        {
            var x = 0;
            var y = 0;
            var lenth = input.Length;
            var yValue = (int)(Math.Sqrt(input.Length) + 1);
            var fill = (yValue * yValue) % (Encoding.Unicode.GetByteCount(input) / 4);
            input += input.Substring(Rnd.random.Next(input.Length - fill - 1), fill);
            var image = new Bitmap(yValue, yValue);

            //fill
            for (int i = 0; i < yValue * yValue; i++)
            {
                if (i == lenth - 1)
                {
                    image.SetPixel(x, y, Color.White);
                }
                else
                {
                    byte[] bytes = Encoding.Unicode.GetBytes(input[i].ToString());
                    var prefix = 4 - bytes.Length;
                    bytes = Enumerable.Repeat<byte>(0, prefix).Concat(bytes).ToArray();
                    Encrypt(bytes);
                    image.SetPixel(x, y, Color.FromArgb(bytes[0], bytes[1], bytes[2], bytes[3]));
                }
                //Console.WriteLine("{0},{1} = {2}", x, y, input[i]);
                x++;
                if (x % yValue == 0)
                {
                    x = 0;
                    y++;
                }
            }
            return image;
        }

        static byte[] Encrypt(byte[] values)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = (byte)(255 - values[i]);
            }
            return values;
        }
        static byte[] Decrypt(byte[] values)
        {
            for (int i = 0; i < values.Length; i++)
            {
                values[i] = (byte)(255 - values[i]);
            }
            return values;
        }

        static string DecodeTextFromArgb(Bitmap image)
        {
            //ComplexImage comp = ComplexImage.FromBitmap(image);
            //comp.BackwardFourierTransform();
            var str = "";
            for (int i = 0; i < image.Height; i++)
            {
                for (int j = 0; j < image.Width; j++)
                {
                    var color = image.GetPixel(j, i);
                    if (color.A == 255 && color.R == 255 && color.G == 255 && color.B == 255)
                        return str;
                    var bytes = new byte[] { color.A, color.R, color.G, color.B };
                    Decrypt(bytes);
                    int skip = 0;
                    if (bytes[0] == 0)
                    {
                        if (bytes[1] == 0)
                        {
                            skip = 2;
                        }
                        else
                        {
                            skip = 1;
                        }
                    }
                    else
                    {
                        skip = 0;
                    }
                    var t = Encoding.Unicode.GetString(bytes.Skip(skip).ToArray());
                    //Console.WriteLine("{0},{1} = {2}", j, i, t);
                    str += t;
                }
            }
            return str;
        }
    }

源碼地址：https://gitee.com/kstudio/ArgbText圖片