JavaDataStructures/ECC/Decoder.java at master · tjock/JavaDataStructures · GitHub

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package ECC;

import java.util.HashMap;

import java.util.List;

public class Decoder {

public static int PAD = 5;

private HashMap<Point, Integer> pointTable;

public Decoder(HashMap<Point, Integer> pointTable) {

this.pointTable = pointTable;

}

public String decode(Matrix A) {

List<String> subKeys = Helpers.getSubKeys();

for (String subKey : subKeys) {

String[] array = subKey.split("\\/");

String transformation = array[0];

int op = Integer.parseInt(array[1]);

int a = Integer.parseInt(array[2]);

int b = Integer.parseInt(array[3]);

int c = Integer.parseInt(array[4]);

int d = Integer.parseInt(array[5]);

if (transformation.equals("R")) {

A.reverseRowTrasformation(a, c, d, op);

A.reverseRowTrasformation(b, c, d, op);

} else {

A.reverseColumnTrasformation(a, c, d, op);

A.reverseColumnTrasformation(b, c, d, op);

}

System.out.println("sub-key : " + subKey);

System.out.println(A);

}

return getPlainText(A);

}

private String getPlainText(Matrix A) {

String plaintText = "";

System.out.println("4) Convert the matrix M to a list of points");

A.toPoints().stream().forEach(System.out::print);

System.out.println("");

for (Point p : A.toPoints()) {

if (pointTable.get(p) != null) {

int asciCode = pointTable.get(p);

plaintText += Character.toString((char) asciCode);

} else {

plaintText += "$";

}

return plaintText;

}

JavaDataStructures/ECC/Decoder.java at master · tjock/JavaDataStructures · GitHub

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