74 lines
2.3 KiB
Java
74 lines
2.3 KiB
Java
|
import java.io.File;
|
||
|
|
import java.io.FileNotFoundException;
|
||
|
|
import java.util.Scanner;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decodes encrypted text in a specific format
|
||
|
|
* @author Isaac Shoebottom (3429069)
|
||
|
|
*/
|
||
|
|
|
||
|
|
public class Decoder {
|
||
|
|
public static void main(String[] args) throws FileNotFoundException {
|
||
|
|
|
||
|
|
Scanner scanFile = new Scanner(new File(args[0]));
|
||
|
|
int cycleCount = 0;
|
||
|
|
|
||
|
|
scanFile.useDelimiter("\\A");
|
||
|
|
String in = scanFile.next();
|
||
|
|
|
||
|
|
String[] codes = in.split("\\r?\\n");
|
||
|
|
|
||
|
|
for (String i: codes) {
|
||
|
|
|
||
|
|
if (i.length() > 1) {
|
||
|
|
int columns = Integer.parseInt(codes[cycleCount * 2]);
|
||
|
|
int rows = codes[cycleCount * 2 + 1].length() / columns;
|
||
|
|
|
||
|
|
char[][] decode = new char[rows][columns];
|
||
|
|
|
||
|
|
char[] chars = i.toCharArray();
|
||
|
|
|
||
|
|
int charCounter = 0;
|
||
|
|
for (int k = 0; k < columns; k++) {
|
||
|
|
|
||
|
|
if (k % 2 != 0) {
|
||
|
|
for (int j = 0; j < rows; j++) {
|
||
|
|
decode[j][k] = chars[charCounter];
|
||
|
|
charCounter++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
for (int j = rows - 1; j > -1; j--) {
|
||
|
|
decode[j][k] = chars[charCounter];
|
||
|
|
charCounter++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
charCounter = 0;
|
||
|
|
char[] decodedChar = new char[i.length()];
|
||
|
|
for (int j = 0; j < rows; j++) {
|
||
|
|
|
||
|
|
if (j % 2 == 0) {
|
||
|
|
for (int k = 0; k < columns; k++) {
|
||
|
|
decodedChar[charCounter] = decode[j][k];
|
||
|
|
charCounter++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
for (int k = columns - 1; k > -1; k--) {
|
||
|
|
decodedChar[charCounter] = decode[j][k];
|
||
|
|
charCounter++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
cycleCount++;
|
||
|
|
String output = String.valueOf(decodedChar);
|
||
|
|
System.out.println(output);
|
||
|
|
}
|
||
|
|
else if (i.equals("0")) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|