1
0
forked from kalmar/DALGLI0

charset update

This commit is contained in:
Hubert Tylkowski 2018-06-20 11:45:59 +02:00
parent 744f9793c5
commit 841b8b4590
9 changed files with 473 additions and 45 deletions

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<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>

12
Zadanie-03/.idea/misc.xml Normal file
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@ -1,5 +1,7 @@
package com.tylkowski.crc;
import java.lang.reflect.Field;
import java.nio.charset.Charset;
import java.util.Arrays;
class CrcTask {
@ -8,23 +10,18 @@ class CrcTask {
private short[] polyGenerator;
private String rawMessage;
CrcTask(String message, String rawMessage) {
this.message = formatMessage(toBinary(message)) + "0000000000000000";
CrcTask(String message, String rawMessage) throws NoSuchFieldException, IllegalAccessException {
setEncoding();
this.message = formatMessage(toBinaryString(message)) + "0000000000000000";
this.rawMessage = rawMessage;
createGeneratingPolynomial();
}
private String toBinary(String s) {
byte[] bytes = s.getBytes();
StringBuilder binary = new StringBuilder();
for (byte b : bytes) {
int val = b;
for (int i = 0; i < 8; i++) {
binary.append((val & 128) == 0 ? 0 : 1);
val <<= 1;
}
}
return binary.toString();
private void setEncoding() throws NoSuchFieldException, IllegalAccessException {
System.setProperty("file.encoding","ISO-8859-1");
Field charset = Charset.class.getDeclaredField("defaultCharset");
charset.setAccessible(true);
charset.set(null,null);
}
private String formatMessage(String message) {
@ -96,8 +93,8 @@ class CrcTask {
return Arrays.copyOfRange(remainder, firstNonZeroVal, remainder.length);
}
private short[] calcXOR(short[] chunk, short[] polyGenerator) {
int a = Integer.parseInt(shortArrayToBinaryString(chunk), 2);
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);
@ -111,35 +108,24 @@ class CrcTask {
return binaryString.toString();
}
private char getCharFromShortArray(short[] chunk, int from, int to) {
short[] sign = Arrays.copyOfRange(chunk, from, to);
private char getCharFromShortArray(short[] piece, int from, int to) {
short[] sign = Arrays.copyOfRange(piece, from, to);
int character = Integer.parseInt(shortArrayToBinaryString(sign), 2);
// System.out.println(character);
return (char) character;
}
private void fillPolynomial(short[] chunk) {
while (chunk.length % 8 != 0) {
chunk = addZeroAtBeginningOfArray(chunk);
private void fillPolynomial(short[] piece) {
while (piece.length % 8 != 0) {
piece = addZeroAtBeginningOfArray(piece);
}
}
private short[] addZeroAtBeginningOfArray(short[] chunk) {
short[] letterTemp = new short[chunk.length + 1];
letterTemp[0] = 0;
System.arraycopy(chunk, 0, letterTemp, 1, chunk.length);
return letterTemp;
}
private void convertMessageToBinaryShortArray() {
messageAsShortArray = new short[message.length()];
for (int i = 0; i < polyGenerator.length; i++) {
if (message.charAt(i) == 48) {
messageAsShortArray[i] = 0;
} else {
messageAsShortArray[i] = 1;
}
}
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) {
@ -173,18 +159,33 @@ class CrcTask {
}
String encode() {
convertMessageToBinaryShortArray();
messageAsShortArray = convertBinaryStringToShortArray(message);
messageAsShortArray = swapPolynomialValues(messageAsShortArray);
return rawMessage + generateFCS();
}
private String letterToBinaryString(char letter) {
// System.out.println("lt: " + letter + " " + (int) letter);
int a = (int) letter;
// if (a == 63) a = 157;
System.out.println("letter in int: " + a);
StringBuilder binaryString = new StringBuilder(Integer.toBinaryString(a));
while (binaryString.length() % 8 != 0) {
binaryString.insert(0, "0");
}
// System.out.println("bs" + binaryString.toString());
return binaryString.toString();
}
boolean decode(String encodedString) {
encodedString = toBinary(encodedString);
encodedString = toBinaryString(encodedString);
encodedString = fillPolyTo8(encodedString);
short[] encodedShortArray = convertBinaryStringToShortArray(encodedString);
encodedShortArray = swapPolynomialValues(encodedShortArray);
while (true) {
if (shortArrayContains(encodedShortArray, 1)) {
if (!shortArrayContains(encodedShortArray, 1)) {
return true;
}
@ -203,6 +204,15 @@ class CrcTask {
}
}
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) {

View File

@ -2,12 +2,19 @@ package com.tylkowski.crc;
public class Main {
public static void main(String[] args) {
// ex. in command line type "a"
CrcTask crcTask = new CrcTask(args[0], args[0]);
System.out.println(crcTask.encode());
String input = crcTask.encode();
if (input.length() >= 3) System.out.println(crcTask.decode(input));
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException {
// use valid character encoding ISO-8859-1
// in command line type "1" for mode and "a" for message
//example "1" "a" -> this will encode string "a" and return FCS
// example "2" "abc" -> this will decode string "abc" and return true if it is valid or false if not
CrcTask crcTask = new CrcTask(args[1], 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]));
}
}