Added file and device verification

Removed redundant wording for clarity.

Dd.java

@@ -0,0 +1,26 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class Dd {
+    public static void dd() {
+                try {
+            ProcessBuilder pb = new ProcessBuilder("sudo", "dd", "if=" + FilePathAdd.ImagePath, "of=" + StorageDeviceLister.fullPath, "bs=" + BlockSize.blockSizeString, "status=progress", "oflag=" + OflagHandler.oflagHandleString);
+            pb.redirectErrorStream(true);
+            Process process = pb.start();
+            
+            BufferedReader reader = new BufferedReader(
+                new InputStreamReader(process.getInputStream())
+            );
+            
+            int character;
+            while ((character = reader.read()) != -1) {
+                char c = (char) character;
+                System.out.print(c);
+                System.out.flush();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

FilePathAdd.java

@@ -1,3 +1,6 @@
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.Scanner;
 
 public class FilePathAdd {
@@ -5,9 +8,25 @@ public class FilePathAdd {
     public static String ImagePath = "";
 
     protected static String filePath(Scanner UserInput) {
-        System.out.println("Please enter the FULL Path of your ISO / Image. ()");
+        fileQuestion();
-        ImagePath = UserInput.nextLine();
+        while (true) {
-        System.out.println("Using File: " + ImagePath);
+            ImagePath = UserInput.nextLine();
-        return ImagePath;
+            if (ImagePath.isBlank()) {
+                System.out.println("Oops.. You didn't specify a file, did you missclick?");
+                continue;
+            }
+            Path path = Path.of(ImagePath);
+            try {
+                Files.readAttributes(path, "basic:size");
+                System.out.println("Using File: " + ImagePath);
+                return ImagePath;
+            } catch (IOException e) {
+                System.out.println("Failed to access file, invalid path or no access to file! Please try again.");
+            }
+        }
+    }
+
+    protected static void fileQuestion() {
+        System.out.println("Please enter the FULL Path of your ISO / Image. (No tab-complete)");
     }
 }

Flasher.java

@@ -5,17 +5,19 @@ public class Flasher {
         
         String input = "";
         
-        System.out.println("The programm wil use the following configuration, do you want to flash with this? (y/n)");
+        System.out.println("The programm wil use the following configuration, do you want to flash with this? (Y/n)");
         System.out.println("    - To be flashed device: " + StorageDeviceLister.fullPath);
         System.out.println("    - To be used path: " + FilePathAdd.ImagePath);
         System.out.println("    - To bed used blocksize: " + BlockSize.blockSizeString);
         System.out.println("    - To be used oflag: " + OflagHandler.oflagHandleString);
         input = UserInput.nextLine();
         if (YesNo.check(input)) {
-            System.out.println("Flashing...");
+            System.out.println("Starting to flash...");
         } else {
             System.out.println("Canceling...");
             System.exit(0);
         }
+        Dd.dd();
+        System.out.println("Flash completed.");
     }
 }

Main.java

@@ -13,7 +13,7 @@ public class Main {
             System.out.println("Canceling...");
             System.exit(0);
         }
-        StorageDeviceLister.deviceList(UserInput);
+        StorageDeviceLister.deviceCheck(UserInput);
         FilePathAdd.filePath(UserInput);
         BlockSize.blockSize(UserInput);
         OflagHandler.handleOflag(UserInput);

README.md

@@ -7,7 +7,7 @@ Small and lightweight image and iso flasher build on `dd`.
 [![Status](https://img.shields.io/badge/Status-Beta-red.svg)](https://en.wikipedia.org/wiki/Software_release_life_cycle#Beta)
 
 # About
-Java program using `dd` to make flashing iso and image files easier on the terminal. This program allows anyone to flash iso and image files without having to search for extra GUI tools and by keeping it simple and resource-friendly.
+Java program using `dd` to make flashing iso and image files easier on the terminal. This program allows anyone to flash iso and image files without having to search for extra GUI tools by keeping it simple and resource-friendly.
 
 # Requirements
 - `Java`: 21 (Download [here](https://www.oracle.com/java/technologies/downloads/#java21)
@@ -21,7 +21,7 @@ Java program using `dd` to make flashing iso and image files easier on the termi
     3. You will be prompted to choose a byte size (default: 4M)
     4. You will be prompted to enter your oflag (default: direct)
     5. You will be asked if you are absolutely sure that you want to continue (flashing will wipe all data)
-- Alternative: using `cflash [device] [iso-path] [block-size] [oflag]` will skip the first question and instantly ask you, if you're absolutely sure you want to continue.
+- Alternative: using `cflash [device] [iso-path] [block-size] [oflag]` will skip the questions and instantly ask you, if you're absolutely sure you want to continue.
 - Once confirmed, the flash will start and a small progress bar will appear showing the flashing progress.
 - After completion, the program will detect the OS from the iso and wish you a great time with your new OS. (Example: "Done! Have fun with your new Linux installation!)
 - **IMPORTANT**: Since dd needs sudo rights, ensure you have root priviliges.

StorageDeviceLister.java

@@ -1,33 +1,56 @@
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.file.Path;
 import java.util.Scanner;
 
 public class StorageDeviceLister {
 
     public static String device = "";
     public static String fullPath = "";
-    
-    protected static String deviceList(Scanner UserInput) {
 
+    protected static String deviceCheck(Scanner UserInput) {
+        // 1. lsblk wird genau EINMAL aufgerufen
+        deviceList();
+
+        // 2. Die Abfrage-Schleife
+        while (true) {
+            device = UserInput.nextLine();
+            if (device.isBlank()) {
+                System.out.println("Oops... Device name is empty. Did you missclick?");
+                continue;
+            }
+            Path path = Path.of("/dev/" + device);
+
+            try {
+                // Versuche, den echten Pfad zu finden
+                fullPath = path.toRealPath().toString();
+                
+                // Wenn wir hier ankommen, war der Pfad gültig
+                System.out.println("Using device: " + fullPath);
+                return fullPath; 
+
+            } catch (IOException e) {
+                // Fehler-Output, danach springt die Schleife wieder nach oben
+                System.out.println("Failed to access device! Invalid path or no access. Please try again.");
+            }
+        }
+    }
+
+    private static void deviceList() {
         try {
             ProcessBuilder pb = new ProcessBuilder("lsblk");
             Process process = pb.start();
-            
+            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
-            BufferedReader reader = new BufferedReader(
-                new InputStreamReader(process.getInputStream())
-            );
-            
             String line;
             while ((line = reader.readLine()) != null) {
                 System.out.println(line);
             }
-        } catch (IOException e) {
+            process.waitFor();
+            System.out.println("Please enter the name of your device (without /dev/):");
+
+        } catch (IOException | InterruptedException e) {
             e.printStackTrace();
         }
-        String device = UserInput.nextLine();
-        System.out.println("Using device: " + "/dev/" + device);
-        fullPath = "/dev/" + device;
-        return fullPath;
     }
-}
+}