Initial commit

.gitignore

+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+#.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser

.gitlab-ci.yml

+static:
+    script: /testers/cs2/lab10/static/test
+A:
+    script: /testers/cs2/lab10/suite/test
+B:
+    script: /testers/cs2/lab10/suite/test
+C:
+    script: /testers/cs2/lab10/suite/test

.idea/libraries/com_github_javaparser_javaparser_core_3_5_12.xml

+<component name="libraryTable">
+  <library name="com.github.javaparser:javaparser-core:3.5.12" type="repository">
+    <properties maven-id="com.github.javaparser:javaparser-core:3.5.12" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/javaparser/javaparser-core/3.5.12/javaparser-core-3.5.12.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

.idea/libraries/org_hamcrest_hamcrest_core_2_2.xml

+<component name="libraryTable">
+  <library name="org.hamcrest:hamcrest-core:2.2" type="repository">
+    <properties maven-id="org.hamcrest:hamcrest-core:2.2" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/2.2/hamcrest-core-2.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest/2.2/hamcrest-2.2.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

.idea/libraries/org_junit_jupiter_junit_jupiter_5_6_0_M1.xml

+<component name="libraryTable">
+  <library name="org.junit.jupiter:junit-jupiter:5.6.0-M1" type="repository">
+    <properties maven-id="org.junit.jupiter:junit-jupiter:5.6.0-M1" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.6.0-M1/junit-jupiter-5.6.0-M1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.6.0-M1/junit-jupiter-api-5.6.0-M1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.1.0/apiguardian-api-1.1.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.6.0-M1/junit-platform-commons-1.6.0-M1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.6.0-M1/junit-jupiter-params-5.6.0-M1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.6.0-M1/junit-jupiter-engine-5.6.0-M1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.6.0-M1/junit-platform-engine-1.6.0-M1.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/lab10-steganography.iml" filepath="$PROJECT_DIR$/lab10-steganography.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

.idea/runConfigurations/A_Tests.xml

+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="A Tests" type="JUnit" factoryName="JUnit">
+    <module name="lab10-steganography" />
+    <option name="MAIN_CLASS_NAME" value="A" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="tags" />
+    <option name="PARAMETERS" value="" />
+    <tag value="A" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file

.idea/runConfigurations/B_Tests.xml

+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="B Tests" type="JUnit" factoryName="JUnit">
+    <module name="lab10-steganography" />
+    <option name="MAIN_CLASS_NAME" value="B" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="tags" />
+    <option name="PARAMETERS" value="" />
+    <tag value="B" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file

.idea/runConfigurations/C_Tests.xml

+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="C Tests" type="JUnit" factoryName="JUnit">
+    <module name="lab10-steganography" />
+    <option name="MAIN_CLASS_NAME" value="" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="tags" />
+    <option name="PARAMETERS" value="" />
+    <tag value="C" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file

.idea/runConfigurations/ImageManipulator.xml

+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="ImageManipulator" type="Application" factoryName="Application">
+    <option name="MAIN_CLASS_NAME" value="edu.caltech.cs2.lab10.ImageManipulator" />
+    <module name="lab10-steganography" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

lab10-steganography.iml

+<?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" />
+      <sourceFolder url="file://$MODULE_DIR$/images" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="com.github.javaparser:javaparser-core:3.5.12" level="project" />
+    <orderEntry type="library" name="org.hamcrest:hamcrest-core:2.2" level="project" />
+    <orderEntry type="library" name="org.junit.jupiter:junit-jupiter:5.6.0-M1" level="project" />
+  </component>
+</module>
\ No newline at end of file

src/edu/caltech/cs2/lab10/Image.java

+package edu.caltech.cs2.lab10;
+
+import edu.caltech.cs2.libraries.Pixel;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+public class Image {
+    private Pixel[][] pixels;
+
+    public Image(File imageFile) throws IOException {
+        BufferedImage img = ImageIO.read(imageFile);
+        this.pixels = new Pixel[img.getWidth()][img.getHeight()];
+        for (int i = 0; i < img.getWidth(); i++) {
+            for (int j = 0; j < img.getHeight(); j++) {
+                this.pixels[i][j] = Pixel.fromInt(img.getRGB(i, j));
+            }
+        }
+    }
+
+    private Image(Pixel[][] pixels) {
+        this.pixels = pixels;
+    }
+
+    public Image transpose() {
+        return null;
+    }
+
+    public String decodeText() {
+        return null;
+    }
+
+    public Image hideText(String text) {
+        return null;
+    }
+
+    public BufferedImage toBufferedImage() {
+        BufferedImage b = new BufferedImage(this.pixels.length, this.pixels[0].length, BufferedImage.TYPE_4BYTE_ABGR);
+        for (int i = 0; i < this.pixels.length; i++) {
+            for (int j = 0; j < this.pixels[0].length; j++) {
+                b.setRGB(i, j, this.pixels[i][j].toInt());
+            }
+        }
+        return b;
+    }
+
+    public void save(String filename) {
+        File out = new File(filename);
+        try {
+            ImageIO.write(this.toBufferedImage(), filename.substring(filename.lastIndexOf(".") + 1, filename.length()), out);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/edu/caltech/cs2/lab10/ImageManipulator.java

+package edu.caltech.cs2.lab10;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Scanner;
+
+public class ImageManipulator {
+    public static void main(String[] args) throws IOException {
+        Scanner scanner = new Scanner(System.in);
+        System.out.print("Enter the filename you'd like to work with: ");
+        String inFilename = scanner.nextLine();
+        // get the filename without the .png
+        String[] splitfile = inFilename.split("\\.");
+        String name = splitfile[0];
+
+        // turn the file into an image
+        File in = new File("images/" + inFilename);
+        Image img = new Image(in);
+
+        boolean keepAsking = true;
+        while(keepAsking) {
+            System.out.print("What would you like to do wih the image (transpose, hide, decode or quit)? ");
+            String action = scanner.nextLine();
+
+            if (action.equals("transpose")) {
+                String outFilename = name + ".transpose.png";
+                //transpose image and save it
+                Image transposedImage = img.transpose();
+                transposedImage.save("images/" + outFilename);
+                System.out.println("Image was transposed!");
+            }
+            else if (action.equals("hide")) {
+                System.out.print("What message would you like to hide? ");
+                String textToHide =  scanner.nextLine();
+                // setup the output file
+                String outFilename = name + ".hidden.png";
+
+                // output file with hidden text
+                Image imgWithText = img.hideText(textToHide);
+                imgWithText.save("images/" + outFilename);
+                System.out.println("Message was hidden!");
+            }
+            else if (action.equals("decode")) {
+                System.out.println("The hidden message is: " + img.decodeText());
+            }
+            else if (action.equals("quit")) {
+                keepAsking = false;
+            }
+            else {
+                System.out.println("Invalid input.");
+            }
+        }
+    }
+}

src/edu/caltech/cs2/libraries/Pixel.java

+package edu.caltech.cs2.libraries;
+
+/**
+ * This class represents an ARGB pixel in an image.
+ */
+public class Pixel {
+    public final int a;
+    public final int r;
+    public final int g;
+    public final int b;
+
+    private Pixel(int a, int r, int g, int b) {
+        this.a = a;
+        this.r = r;
+        this.g = g;
+        this.b = b;
+    }
+
+    public static Pixel fromInt(int argb) {
+        int a = (argb & 0xFF000000) >> 24;
+        int r = (argb & 0x00FF0000) >> 16;
+        int g = (argb & 0x0000FF00) >> 8;
+        int b = (argb & 0x000000FF) >> 0;
+        return new Pixel(a, r, g, b);
+    }
+
+    public int toInt() {
+        return (a << 24) | (r << 16) | (g << 8) | b;
+    }
+
+    /**
+     * Returns a new pixel with the lowest bit of the red channel set to {@code lowR}.
+     * @param lowR the value to set the low bit of the red channel to
+     * @return an altered pixel that has the lowest bit of the red channel set to {@code lowR}
+     */
+    public Pixel fixLowestBitOfR(int lowR) {
+        if ((lowR != 0 && lowR != 1)) {
+            throw new IllegalArgumentException("lowR must represent a bit!");
+        }
+
+        int r = (this.r & 0xFE) | lowR;
+        return new Pixel(this.a, r, this.g, this.b);
+    }
+
+    /**
+     * Returns the LSB of the red channel in this pixel
+     * @return the LSB of the red channel in this pixel
+     */
+    public int getLowestBitOfR() {
+        return this.r & 0x1;
+    }
+}