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