Zadanie 3 - CRC - wersja innym inputem #31
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02-Wielomiany/out/production/Wielomiany/Main.class
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02-Wielomiany/out/production/Wielomiany/Main.class
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02-Wielomiany/out/production/Wielomiany/PolynomialTask.class
Normal file
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02-Wielomiany/out/production/Wielomiany/PolynomialTask.class
Normal file
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5
02-Wielomiany/src/DivisionErrorException.java
Normal file
5
02-Wielomiany/src/DivisionErrorException.java
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public class DivisionErrorException extends Throwable {
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public DivisionErrorException() {
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System.out.println("Division error!");
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}
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}
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||||||
19
02-Wielomiany/src/Main.java
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19
02-Wielomiany/src/Main.java
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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public class Main {
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public static void main(String[] args) throws DivisionErrorException, MultiplierNotFoundException {
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//ex input in run console : 2 "1 1 1 0 1" "0 1 1"
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int n = Integer.parseInt(args[0]);
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List<Integer> firstPolynomial = new ArrayList<>();
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args[1] = args[1].substring(1, args[1].length()-1);
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args[2] = args[2].substring(1, args[2].length()-1);
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Arrays.asList(args[1].split( ",\\s*" )).forEach(factor -> firstPolynomial.add(Integer.valueOf(factor)));
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List<Integer> secondPolynomial = new ArrayList<>();
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Arrays.asList(args[2].split(",\\s*" )).forEach(factor -> secondPolynomial.add(Integer.valueOf(factor)));
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PolynomialTask polynomialTask = new PolynomialTask(n, firstPolynomial, secondPolynomial);
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polynomialTask.printAllValuesToStandardOutput();
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}
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}
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5
02-Wielomiany/src/MultiplierNotFoundException.java
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5
02-Wielomiany/src/MultiplierNotFoundException.java
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public class MultiplierNotFoundException extends Throwable {
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public MultiplierNotFoundException() {
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System.out.println("DivisionError");
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}
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}
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134
02-Wielomiany/src/PolynomialTask.java
Normal file
134
02-Wielomiany/src/PolynomialTask.java
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.stream.Collectors;
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public class PolynomialTask {
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private int n;
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private List<Integer> firstPolynomial;
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private List<Integer> secondPolynomial;
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public PolynomialTask(int n, List<Integer> firstPoly, List<Integer> secondPoly) {
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this.n = n;
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this.firstPolynomial = firstPoly;
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this.secondPolynomial = secondPoly;
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}
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public Integer[] multiplyPolynomials(List<Integer> firstPolynomial, List<Integer> secondPolynomial) {
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int[] multiplied = new int[firstPolynomial.size() + secondPolynomial.size() - 1];
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int sizeOfFirstPoly = firstPolynomial.size();
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int sizeOfSecondPoly = secondPolynomial.size();
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for (int i = 0; i < sizeOfFirstPoly; i++) {
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for (int j = 0; j < sizeOfSecondPoly; j++)
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multiplied[i + j] = (multiplied[i + j] + (firstPolynomial.get(i) * secondPolynomial.get(j))) % n;
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}
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return Arrays.stream(multiplied).boxed().toArray(Integer[]::new);
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}
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public int[] moduloDividePolynomialsReturnQuotient(List<Integer> firstPoly, List<Integer> secondPoly) throws MultiplierNotFoundException, DivisionErrorException {
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int[] quotient = new int[firstPoly.size() + secondPoly.size()];
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int firstPolyDegree = firstPoly.size() - 1;
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int secondPolyDegree = secondPoly.size() - 1;
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List<Integer> polynomialAfterSubtract = firstPoly;
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while (firstPolyDegree >= secondPolyDegree) {
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polynomialAfterSubtract = calcQuotient(polynomialAfterSubtract, secondPoly, quotient);
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firstPolyDegree = polynomialAfterSubtract.size() - 1;
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}
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int[] remainder = new int[polynomialAfterSubtract.size()];
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for (int i = 0; i < polynomialAfterSubtract.size(); i++) {
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remainder[i] = polynomialAfterSubtract.get(i);
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}
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return remainder;
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}
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private List<Integer> calcQuotient(List<Integer> firstPoly, List<Integer> secondPoly, int[] quotient) throws MultiplierNotFoundException, DivisionErrorException {
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int firstPolyDegree = firstPoly.size() - 1;
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int secondPolyDegree = secondPoly.size() - 1;
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if (firstPolyDegree < secondPolyDegree) {
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throw new DivisionErrorException();
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}
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int quotientCoefficient;
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if ((((float) firstPoly.get(firstPolyDegree) / (float) secondPoly.get(secondPolyDegree))) == Math.round(firstPoly.get(firstPolyDegree) / secondPoly.get(secondPolyDegree))) {
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quotientCoefficient = firstPoly.get(firstPolyDegree) / secondPoly.get(secondPolyDegree);
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} else {
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quotientCoefficient = invElem(firstPoly.get(firstPolyDegree), secondPoly.get(secondPolyDegree));
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}
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quotient[firstPolyDegree - secondPolyDegree] += quotientCoefficient;
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List<Integer> newPoly = generatePolyFromIndexAndValue(firstPolyDegree - secondPolyDegree, quotientCoefficient);
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Integer[] multipliedPolynomials = multiplyPolynomials(newPoly, secondPoly);
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List<Integer> polynomialAfterFirstDivide = new ArrayList<>(Arrays.asList(multipliedPolynomials));
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return removeUnnecessaryZeros(subtractTwoPolynomials(firstPoly, polynomialAfterFirstDivide));
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}
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private List<Integer> removeUnnecessaryZeros(List<Integer> polynomialAfterSubtract) {
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int amountOfZeros = 0;
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for (int i = polynomialAfterSubtract.size() - 1; i >= 0; i--) {
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if (polynomialAfterSubtract.get(i) == 0) {
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amountOfZeros++;
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} else {
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break;
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}
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}
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polynomialAfterSubtract = polynomialAfterSubtract.subList(0, polynomialAfterSubtract.size() - amountOfZeros);
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return polynomialAfterSubtract;
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}
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private List<Integer> subtractTwoPolynomials(List<Integer> firstPoly, List<Integer> secondPoly) {
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List<Integer> subtractedPolynomial = new ArrayList<>(Collections.nCopies(firstPoly.size() + secondPoly.size(), 0));
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for (int index = firstPoly.size(); index >= 0; index--) {
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if (index < secondPoly.size()) {
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subtractedPolynomial.set(index, firstPoly.get(index) - secondPoly.get(index));
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parseNegativeElement(subtractedPolynomial, index);
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}
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}
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return subtractedPolynomial;
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}
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private void parseNegativeElement(List<Integer> subtractedPolynomial, int index) {
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while (subtractedPolynomial.get(index) < 0)
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subtractedPolynomial.set(index, (subtractedPolynomial.get(index) * subtractedPolynomial.get(index)) % n);
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}
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private List<Integer> generatePolyFromIndexAndValue(int size, int quotientCoefficient) {
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List<Integer> poly = new ArrayList<>(Collections.nCopies(size + 1, 0));
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poly.set(size, quotientCoefficient);
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return poly;
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}
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private int invElem(int a, int b) throws MultiplierNotFoundException {
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for (int i = 0; i < n; i++) {
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if (a == (b * i) % n) {
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return i;
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}
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}
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throw new MultiplierNotFoundException();
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}
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public void printAllValuesToStandardOutput() throws DivisionErrorException, MultiplierNotFoundException {
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List<List<Integer>> values = new ArrayList<>();
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values.add(Arrays.asList(multiplyPolynomials(firstPolynomial, secondPolynomial)));
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values.add(Arrays.stream(moduloDividePolynomialsReturnQuotient(firstPolynomial, secondPolynomial)).boxed().collect(Collectors.toList()));
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try {
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values.add(gcd(firstPolynomial, secondPolynomial));
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} catch (MultiplierNotFoundException e) {
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}
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System.out.println(values);
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}
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private List<Integer> gcd(List<Integer> polyOne, List<Integer> polyTwo) throws MultiplierNotFoundException, DivisionErrorException {
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if (polyTwo.isEmpty()) return polyOne;
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List<Integer> poly = Arrays.stream(moduloDividePolynomialsReturnQuotient(polyOne, polyTwo)).boxed().collect(Collectors.toList());
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return gcd(polyTwo, poly);
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}
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}
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8
Zadanie-03/.idea/artifacts/Zadanie_03_jar.xml
Normal file
8
Zadanie-03/.idea/artifacts/Zadanie_03_jar.xml
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|||||||
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<component name="ArtifactManager">
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||||||
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<artifact type="jar" name="Zadanie-03:jar">
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||||||
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<output-path>$PROJECT_DIR$/out/artifacts/Zadanie_03_jar</output-path>
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<root id="archive" name="Zadanie-03.jar">
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<element id="module-output" name="Zadanie-03" />
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</root>
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</artifact>
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||||||
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</component>
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1
Zadanie-03/.idea/description.html
Normal file
1
Zadanie-03/.idea/description.html
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<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>
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12
Zadanie-03/.idea/misc.xml
Normal file
12
Zadanie-03/.idea/misc.xml
Normal file
@ -0,0 +1,12 @@
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|||||||
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<?xml version="1.0" encoding="UTF-8"?>
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||||||
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<project version="4">
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||||||
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<component name="EntryPointsManager">
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||||||
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<entry_points version="2.0" />
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||||||
|
</component>
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||||||
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<component name="ProjectKey">
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||||||
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<option name="state" value="project://e2804f05-5315-4fc6-a121-c522a6c26470" />
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||||||
|
</component>
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||||||
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<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
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||||||
|
<output url="file://$PROJECT_DIR$/out" />
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||||||
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</component>
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||||||
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</project>
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||||||
8
Zadanie-03/.idea/modules.xml
Normal file
8
Zadanie-03/.idea/modules.xml
Normal file
@ -0,0 +1,8 @@
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|||||||
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<?xml version="1.0" encoding="UTF-8"?>
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||||||
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<project version="4">
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||||||
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<component name="ProjectModuleManager">
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||||||
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<modules>
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||||||
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<module fileurl="file://$PROJECT_DIR$/Zadanie-03.iml" filepath="$PROJECT_DIR$/Zadanie-03.iml" />
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</modules>
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||||||
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</component>
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||||||
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</project>
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||||||
3
Zadanie-03/.idea/project-template.xml
Normal file
3
Zadanie-03/.idea/project-template.xml
Normal file
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<template>
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||||||
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<input-field default="com.company">IJ_BASE_PACKAGE</input-field>
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</template>
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423
Zadanie-03/.idea/workspace.xml
Normal file
423
Zadanie-03/.idea/workspace.xml
Normal file
@ -0,0 +1,423 @@
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|||||||
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<?xml version="1.0" encoding="UTF-8"?>
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||||||
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<project version="4">
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||||||
|
<component name="ChangeListManager">
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||||||
|
<list default="true" id="5f8a3521-157f-4adb-a0ab-dc99bbf14aa0" name="Default" comment="">
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||||||
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<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/src/com/tylkowski/crc/CrcTask.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/com/tylkowski/crc/CrcTask.java" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/src/com/tylkowski/crc/Main.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/com/tylkowski/crc/Main.java" afterDir="false" />
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||||||
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</list>
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||||||
|
<ignored path="$PROJECT_DIR$/out/" />
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||||||
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<option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
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||||||
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<option name="TRACKING_ENABLED" value="true" />
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||||||
|
<option name="SHOW_DIALOG" value="false" />
|
||||||
|
<option name="HIGHLIGHT_CONFLICTS" value="true" />
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||||||
|
<option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
|
||||||
|
<option name="LAST_RESOLUTION" value="IGNORE" />
|
||||||
|
</component>
|
||||||
|
<component name="FileEditorManager">
|
||||||
|
<leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
|
||||||
|
<file leaf-file-name="Main.java" pinned="false" current-in-tab="true">
|
||||||
|
<entry file="file://$PROJECT_DIR$/src/com/tylkowski/crc/Main.java">
|
||||||
|
<provider selected="true" editor-type-id="text-editor">
|
||||||
|
<state relative-caret-position="255">
|
||||||
|
<caret line="15" column="9" lean-forward="true" selection-start-line="15" selection-start-column="9" selection-end-line="15" selection-end-column="9" />
|
||||||
|
</state>
|
||||||
|
</provider>
|
||||||
|
</entry>
|
||||||
|
</file>
|
||||||
|
<file leaf-file-name="CrcTask.java" pinned="false" current-in-tab="false">
|
||||||
|
<entry file="file://$PROJECT_DIR$/src/com/tylkowski/crc/CrcTask.java">
|
||||||
|
<provider selected="true" editor-type-id="text-editor">
|
||||||
|
<state relative-caret-position="178">
|
||||||
|
<caret line="44" column="9" lean-forward="true" selection-start-line="44" selection-start-column="9" selection-end-line="44" selection-end-column="9" />
|
||||||
|
<folding>
|
||||||
|
<element signature="imports" expanded="true" />
|
||||||
|
</folding>
|
||||||
|
</state>
|
||||||
|
</provider>
|
||||||
|
</entry>
|
||||||
|
</file>
|
||||||
|
</leaf>
|
||||||
|
</component>
|
||||||
|
<component name="FileTemplateManagerImpl">
|
||||||
|
<option name="RECENT_TEMPLATES">
|
||||||
|
<list>
|
||||||
|
<option value="Class" />
|
||||||
|
</list>
|
||||||
|
</option>
|
||||||
|
</component>
|
||||||
|
<component name="FindInProjectRecents">
|
||||||
|
<findStrings>
|
||||||
|
<find>System.out.println</find>
|
||||||
|
<find>for</find>
|
||||||
|
<find />
|
||||||
|
<find>System</find>
|
||||||
|
<find>ch</find>
|
||||||
|
<find>shot</find>
|
||||||
|
<find>gen_deg</find>
|
||||||
|
<find>char</find>
|
||||||
|
<find>swa</find>
|
||||||
|
<find>chunk</find>
|
||||||
|
<find>toBin</find>
|
||||||
|
<find>toBinaryStr</find>
|
||||||
|
<find>swap</find>
|
||||||
|
<find>letter</find>
|
||||||
|
<find>lol</find>
|
||||||
|
</findStrings>
|
||||||
|
</component>
|
||||||
|
<component name="Git.Settings">
|
||||||
|
<option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/.." />
|
||||||
|
</component>
|
||||||
|
<component name="IdeDocumentHistory">
|
||||||
|
<option name="CHANGED_PATHS">
|
||||||
|
<list>
|
||||||
|
<option value="$PROJECT_DIR$/src/com/tylkowski/crc/Main.java" />
|
||||||
|
<option value="$PROJECT_DIR$/src/com/tylkowski/crc/CrcTask.java" />
|
||||||
|
</list>
|
||||||
|
</option>
|
||||||
|
</component>
|
||||||
|
<component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
|
||||||
|
<component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
|
||||||
|
<component name="JsGulpfileManager">
|
||||||
|
<detection-done>true</detection-done>
|
||||||
|
<sorting>DEFINITION_ORDER</sorting>
|
||||||
|
</component>
|
||||||
|
<component name="ProjectFrameBounds" extendedState="6">
|
||||||
|
<option name="x" value="676" />
|
||||||
|
<option name="width" value="697" />
|
||||||
|
<option name="height" value="735" />
|
||||||
|
</component>
|
||||||
|
<component name="ProjectLevelVcsManager" settingsEditedManually="true" />
|
||||||
|
<component name="ProjectView">
|
||||||
|
<navigator proportions="" version="1">
|
||||||
|
<foldersAlwaysOnTop value="true" />
|
||||||
|
</navigator>
|
||||||
|
<panes>
|
||||||
|
<pane id="PackagesPane" />
|
||||||
|
<pane id="AndroidView" />
|
||||||
|
<pane id="ProjectPane">
|
||||||
|
<subPane>
|
||||||
|
<expand>
|
||||||
|
<path>
|
||||||
|
<item name="Zadanie-03" type="b2602c69:ProjectViewProjectNode" />
|
||||||
|
<item name="Zadanie-03" type="462c0819:PsiDirectoryNode" />
|
||||||
|
</path>
|
||||||
|
<path>
|
||||||
|
<item name="Zadanie-03" type="b2602c69:ProjectViewProjectNode" />
|
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||||||
|
<provider selected="true" editor-type-id="text-editor">
|
||||||
|
<state relative-caret-position="255">
|
||||||
|
<caret line="15" column="9" lean-forward="true" selection-start-line="15" selection-start-column="9" selection-end-line="15" selection-end-column="9" />
|
||||||
|
</state>
|
||||||
|
</provider>
|
||||||
|
</entry>
|
||||||
|
</component>
|
||||||
|
</project>
|
||||||
12
Zadanie-03/Zadanie-03.iml
Normal file
12
Zadanie-03/Zadanie-03.iml
Normal file
@ -0,0 +1,12 @@
|
|||||||
|
<?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" />
|
||||||
|
</content>
|
||||||
|
<orderEntry type="inheritedJdk" />
|
||||||
|
<orderEntry type="sourceFolder" forTests="false" />
|
||||||
|
</component>
|
||||||
|
</module>
|
||||||
|
|
||||||
BIN
Zadanie-03/out/artifacts/Zadanie_03_jar/Zadanie-03.jar
Normal file
BIN
Zadanie-03/out/artifacts/Zadanie_03_jar/Zadanie-03.jar
Normal file
Binary file not shown.
@ -0,0 +1,3 @@
|
|||||||
|
Manifest-Version: 1.0
|
||||||
|
Main-Class: com.tylkowski.crc.Main
|
||||||
|
|
||||||
Binary file not shown.
Binary file not shown.
3
Zadanie-03/src/META-INF/MANIFEST.MF
Normal file
3
Zadanie-03/src/META-INF/MANIFEST.MF
Normal file
@ -0,0 +1,3 @@
|
|||||||
|
Manifest-Version: 1.0
|
||||||
|
Main-Class: com.tylkowski.crc.Main
|
||||||
|
|
||||||
225
Zadanie-03/src/com/tylkowski/crc/CrcTask.java
Normal file
225
Zadanie-03/src/com/tylkowski/crc/CrcTask.java
Normal file
@ -0,0 +1,225 @@
|
|||||||
|
package com.tylkowski.crc;
|
||||||
|
|
||||||
|
import java.util.Arrays;
|
||||||
|
|
||||||
|
class CrcTask {
|
||||||
|
private String message;
|
||||||
|
private short[] messageAsShortArray;
|
||||||
|
private short[] polyGenerator;
|
||||||
|
private String rawMessage;
|
||||||
|
|
||||||
|
CrcTask(String message) {
|
||||||
|
this.rawMessage = message;
|
||||||
|
this.message = formatMessage(toBinaryString(message)) + "0000000000000000";
|
||||||
|
createGeneratingPolynomial();
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
private String formatMessage(String message) {
|
||||||
|
int firstNonZeroVal = 0;
|
||||||
|
boolean found = false;
|
||||||
|
StringBuilder validString = new StringBuilder();
|
||||||
|
while (!found && firstNonZeroVal < message.length()) {
|
||||||
|
if (message.charAt(firstNonZeroVal) == 48) {
|
||||||
|
firstNonZeroVal++;
|
||||||
|
} else {
|
||||||
|
found = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int i = firstNonZeroVal; i < message.length(); i++) {
|
||||||
|
if (message.charAt(i) == 48) {
|
||||||
|
validString.append(0);
|
||||||
|
} else {
|
||||||
|
validString.append(1);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
StringBuilder msg = new StringBuilder(validString.toString());
|
||||||
|
while (msg.length() % 8 != 0) {
|
||||||
|
msg.insert(0, "0");
|
||||||
|
}
|
||||||
|
|
||||||
|
return msg.toString();
|
||||||
|
}
|
||||||
|
|
||||||
|
private String generateFCS() {
|
||||||
|
while (true) {
|
||||||
|
if (messageAsShortArray[0] == 0) {
|
||||||
|
messageAsShortArray = Arrays.copyOfRange(messageAsShortArray, 1, messageAsShortArray.length);
|
||||||
|
} else {
|
||||||
|
short[] piece = Arrays.copyOfRange(messageAsShortArray, 0, Math.min(polyGenerator.length, messageAsShortArray.length));
|
||||||
|
if (piece.length < polyGenerator.length) {
|
||||||
|
fillPolynomial(piece);
|
||||||
|
return createTwoCharsOfFCS(piece);
|
||||||
|
}
|
||||||
|
short[] remainder = calcXOR(piece, polyGenerator);
|
||||||
|
remainder = removeUnecessaryZeros(remainder);
|
||||||
|
messageAsShortArray = createMessageFromRemainderAndPartFromOldMessage(remainder, messageAsShortArray);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
private String createTwoCharsOfFCS(short[] piece) {
|
||||||
|
short[] firstPiece = Arrays.copyOfRange(piece, 0, 8);
|
||||||
|
short[] secondPiece = Arrays.copyOfRange(piece, piece.length - 8, piece.length);
|
||||||
|
short[] mergedPieces = new short[firstPiece.length + secondPiece.length];
|
||||||
|
for (int i = 0; i < firstPiece.length; i++) {
|
||||||
|
mergedPieces[i] = firstPiece[i];
|
||||||
|
mergedPieces[i + 8] = secondPiece[i];
|
||||||
|
}
|
||||||
|
return "0x" + Integer.toHexString(Integer.parseInt(shortArrayToBinaryString(mergedPieces), 2));
|
||||||
|
}
|
||||||
|
|
||||||
|
private short[] createMessageFromRemainderAndPartFromOldMessage(short[] remainder, short[] msg) {
|
||||||
|
short[] tempArr = new short[remainder.length + msg.length - polyGenerator.length];
|
||||||
|
System.arraycopy(remainder, 0, tempArr, 0, remainder.length);
|
||||||
|
int diff = polyGenerator.length - remainder.length;
|
||||||
|
System.arraycopy(msg, remainder.length + diff, tempArr, remainder.length, msg.length - diff - remainder.length);
|
||||||
|
msg = tempArr;
|
||||||
|
return msg;
|
||||||
|
}
|
||||||
|
|
||||||
|
private short[] removeUnecessaryZeros(short[] remainder) {
|
||||||
|
int firstNonZeroVal = 0;
|
||||||
|
boolean found = false;
|
||||||
|
while (!found && firstNonZeroVal < remainder.length) {
|
||||||
|
if (remainder[firstNonZeroVal] == 0) {
|
||||||
|
firstNonZeroVal++;
|
||||||
|
} else {
|
||||||
|
found = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return Arrays.copyOfRange(remainder, firstNonZeroVal, remainder.length);
|
||||||
|
}
|
||||||
|
|
||||||
|
private short[] calcXOR(short[] piece, short[] polyGenerator) {
|
||||||
|
int a = Integer.parseInt(shortArrayToBinaryString(piece), 2);
|
||||||
|
int b = Integer.parseInt(shortArrayToBinaryString(polyGenerator), 2);
|
||||||
|
String binaryString = Integer.toBinaryString(a ^ b);
|
||||||
|
return convertBinaryStringToShortArray(binaryString);
|
||||||
|
}
|
||||||
|
|
||||||
|
private String shortArrayToBinaryString(short[] value) {
|
||||||
|
StringBuilder binaryString = new StringBuilder();
|
||||||
|
for (Short a : value) {
|
||||||
|
binaryString.append(a);
|
||||||
|
}
|
||||||
|
return binaryString.toString();
|
||||||
|
}
|
||||||
|
|
||||||
|
private void fillPolynomial(short[] piece) {
|
||||||
|
while (piece.length % 8 != 0) {
|
||||||
|
piece = addZeroAtBeginningOfArray(piece);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private short[] addZeroAtBeginningOfArray(short[] piece) {
|
||||||
|
short[] tempArray = new short[piece.length + 1];
|
||||||
|
tempArray[0] = 0;
|
||||||
|
System.arraycopy(piece, 0, tempArray, 1, piece.length);
|
||||||
|
return tempArray;
|
||||||
|
}
|
||||||
|
|
||||||
|
private short[] convertBinaryStringToShortArray(String binaryString) {
|
||||||
|
short[] shortArray = new short[binaryString.length()];
|
||||||
|
for (int i = 0; i < binaryString.length(); i++) {
|
||||||
|
if (binaryString.charAt(i) == 48) {
|
||||||
|
shortArray[i] = 0;
|
||||||
|
} else {
|
||||||
|
shortArray[i] = 1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return shortArray;
|
||||||
|
}
|
||||||
|
|
||||||
|
private void createGeneratingPolynomial() {
|
||||||
|
polyGenerator = new short[17];
|
||||||
|
for (int i = 0; i < 17; i++) {
|
||||||
|
polyGenerator[i] = 0;
|
||||||
|
}
|
||||||
|
polyGenerator[0] = 1;
|
||||||
|
polyGenerator[4] = 1;
|
||||||
|
polyGenerator[11] = 1;
|
||||||
|
polyGenerator[16] = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
private short[] swapPolynomialValues(short[] poly) {
|
||||||
|
for (int i = 0; i < polyGenerator.length - 1; i++) {
|
||||||
|
poly[i] = (short) ((poly[i] + 1) % 2);
|
||||||
|
}
|
||||||
|
return poly;
|
||||||
|
}
|
||||||
|
|
||||||
|
String encode() {
|
||||||
|
messageAsShortArray = convertBinaryStringToShortArray(message);
|
||||||
|
messageAsShortArray = swapPolynomialValues(messageAsShortArray);
|
||||||
|
return rawMessage + generateFCS();
|
||||||
|
}
|
||||||
|
|
||||||
|
private String letterToBinaryString(char letter) {
|
||||||
|
short a = (short) letter;
|
||||||
|
StringBuilder binaryString = new StringBuilder(Integer.toBinaryString(a));
|
||||||
|
while (binaryString.length() % 8 != 0) {
|
||||||
|
binaryString.insert(0, "0");
|
||||||
|
}
|
||||||
|
return binaryString.toString();
|
||||||
|
}
|
||||||
|
|
||||||
|
boolean decode(String encodedString) {
|
||||||
|
String fcs = encodedString.substring(encodedString.indexOf("0x"), encodedString.length());
|
||||||
|
encodedString = encodedString.replace(fcs, "");
|
||||||
|
encodedString = toBinaryString(encodedString);
|
||||||
|
encodedString = encodedString + toBinaryStringFromHexValue(fcs);
|
||||||
|
encodedString = fillPoly(encodedString);
|
||||||
|
short[] encodedShortArray = convertBinaryStringToShortArray(encodedString);
|
||||||
|
encodedShortArray = swapPolynomialValues(encodedShortArray);
|
||||||
|
while (true) {
|
||||||
|
if (!shortArrayContains(encodedShortArray, 1)) {
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
if (encodedShortArray[0] == 0) {
|
||||||
|
encodedShortArray = Arrays.copyOfRange(encodedShortArray, 1, encodedShortArray.length);
|
||||||
|
} else {
|
||||||
|
short[] piece = Arrays.copyOfRange(encodedShortArray, 0, Math.min(polyGenerator.length, encodedShortArray.length));
|
||||||
|
if (piece.length < polyGenerator.length) {
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
short[] remainder = calcXOR(piece, polyGenerator);
|
||||||
|
remainder = removeUnecessaryZeros(remainder);
|
||||||
|
encodedShortArray = createMessageFromRemainderAndPartFromOldMessage(remainder, encodedShortArray);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private String toBinaryStringFromHexValue(String hexString) {
|
||||||
|
hexString = hexString.substring(2, hexString.length());
|
||||||
|
return String.valueOf(Integer.toBinaryString(Integer.parseInt(hexString, 16)));
|
||||||
|
}
|
||||||
|
|
||||||
|
private String toBinaryString(String encodedString) {
|
||||||
|
StringBuilder stringBuilder = new StringBuilder();
|
||||||
|
for (int i = 0; i < encodedString.length(); i++) {
|
||||||
|
stringBuilder.append(letterToBinaryString(encodedString.charAt(i)));
|
||||||
|
}
|
||||||
|
return stringBuilder.toString();
|
||||||
|
}
|
||||||
|
|
||||||
|
private boolean shortArrayContains(short[] encodedShortArray, int value) {
|
||||||
|
for (short item : encodedShortArray) {
|
||||||
|
if (item == value) {
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
private String fillPoly(String encodedString) {
|
||||||
|
StringBuilder stringBuilder = new StringBuilder(encodedString);
|
||||||
|
while (stringBuilder.length() % 8 != 0) {
|
||||||
|
stringBuilder.insert(0, "0");
|
||||||
|
}
|
||||||
|
return stringBuilder.toString();
|
||||||
|
}
|
||||||
|
}
|
||||||
22
Zadanie-03/src/com/tylkowski/crc/Main.java
Normal file
22
Zadanie-03/src/com/tylkowski/crc/Main.java
Normal file
@ -0,0 +1,22 @@
|
|||||||
|
package com.tylkowski.crc;
|
||||||
|
|
||||||
|
public class Main {
|
||||||
|
|
||||||
|
public static void main(String[] args) {
|
||||||
|
// in command line type "1" for mode and "b" for message
|
||||||
|
// example "1" "b" -> this will encode string "b" and return FCS
|
||||||
|
// example "2" "bX" -> this will decode string "bX" and return true if it is valid or false if not
|
||||||
|
// X - FCS
|
||||||
|
CrcTask crcTask = new CrcTask(args[1]);
|
||||||
|
if (args[0].equals("1")) {
|
||||||
|
//create FCS
|
||||||
|
System.out.println(crcTask.encode());
|
||||||
|
} else if (args[0].equals("2")) {
|
||||||
|
// check fcs
|
||||||
|
if (args[1].length() >= 3) System.out.println(crcTask.decode(args[1]));
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user