First commit

bdcrack.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
+

src/ga/bronson/Main.java

@@ -0,0 +1,95 @@
+package ga.bronson;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class Main {
+
+    public static void main(String[] args) {
+        if(args.length < 2) {
+            System.out.println("Usage: [encode or decode] [image file name] [message to encode]\n");
+        }
+
+        switch (args[0]) {
+            case "decode":
+                decode(args[1]);
+                break;
+            case "encode":
+                if (args.length == 3) {
+                    encode(args[1], args[2]);
+                } else {
+                    System.out.println("Usage: bdcrack [encode or decode]\n");
+                }
+                break;
+            default:
+                System.out.println("Usage: bdcrack [encode or decode]\n");
+                break;
+        }
+    }
+
+    private static void encode(String fileName, String message) {
+        ArrayList<Color> pixels = new ArrayList<>();
+        int rgbIndex = 0;
+        int rgb[] = new int[3];
+
+        for(int i=0; i<message.length(); i++) {
+            rgb[rgbIndex] = message.charAt(i);
+
+            if(rgbIndex == 2) {
+                pixels.add(new Color(rgb[0], rgb[1], rgb[2]));
+            }
+
+            rgbIndex = (rgbIndex+1)%3;
+        }
+
+        int dimensions = (int)Math.sqrt((double)pixels.size()) + 1;
+        BufferedImage img = new BufferedImage(dimensions, dimensions, BufferedImage.TYPE_INT_RGB);
+        int k=0;
+
+        for(int i=0; i<dimensions; i++) {
+            for(int j=0; j<dimensions; j++) {
+                if(k < pixels.size()) {
+                    img.setRGB(j, i, pixels.get(k).getRGB());
+                } else {
+                    img.setRGB(j, i, new Color(0, 0, 0).getRGB());
+                }
+                k++;
+            }
+        }
+
+        try {
+            File file = new File(fileName);
+            ImageIO.write(img, "png", file);
+        } catch(IOException e) {
+            System.out.println("Failed to open file ["+fileName+"].\n");
+        }
+    }
+
+    private static void decode(String fileName) {
+        BufferedImage img;
+
+        try {
+            img = ImageIO.read(new File(fileName));
+        } catch (IOException e) {
+            System.out.println("Failed to open file ["+fileName+"].\n");
+            return;
+        }
+
+        StringBuilder message = new StringBuilder();
+
+        for(int i=0; i<img.getHeight(); i++) {
+            for(int j=0; j<img.getWidth(); j++) {
+                Color pixel = new Color(img.getRGB(j, i));
+                message.append((char)pixel.getRed()).
+                        append((char)pixel.getGreen()).
+                        append((char) pixel.getBlue());
+            }
+        }
+
+        System.out.println(message);
+    }
+}