commit f0602812cfdffced6284a1525daa7ff5c2d28bd2
Author: Apostolof <apotwohd@gmail.com>
Date:   Fri Dec 29 13:10:43 2017 +0200

    Init

diff --git a/.classpath b/.classpath
new file mode 100644
index 0000000..e51bb91
--- /dev/null
+++ b/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="lib" path="libs/ithakimodem.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/.project b/.project
new file mode 100644
index 0000000..75d2c48
--- /dev/null
+++ b/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>finalCode</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/bin/ACK.class b/bin/ACK.class
new file mode 100644
index 0000000..4aad709
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diff --git a/bin/Camera.class b/bin/Camera.class
new file mode 100644
index 0000000..86050a5
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diff --git a/bin/ComputerNetworks.class b/bin/ComputerNetworks.class
new file mode 100644
index 0000000..7f15992
Binary files /dev/null and b/bin/ComputerNetworks.class differ
diff --git a/bin/GPS.class b/bin/GPS.class
new file mode 100644
index 0000000..07d076b
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diff --git a/bin/Ping.class b/bin/Ping.class
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index 0000000..c66994e
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diff --git a/bin/Utils.class b/bin/Utils.class
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diff --git a/libs/ithakimodem.jar b/libs/ithakimodem.jar
new file mode 100644
index 0000000..4229d48
Binary files /dev/null and b/libs/ithakimodem.jar differ
diff --git a/src/ACK.java b/src/ACK.java
new file mode 100644
index 0000000..9f8f28d
--- /dev/null
+++ b/src/ACK.java
@@ -0,0 +1,144 @@
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import ithakimodem.Modem;
+
+public class ACK {
+	private final static String regex = ".*PSTART.*<(.*)> ([0-9]*) PSTOP.";
+	private final static String subst = "$1,$2";
+	private final static Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
+	
+	private static final Scanner input = new Scanner(System.in);
+	
+	public static void ack() {
+		System.out.print("Type request code for ack: ");
+		String ackRequestCode = input.nextLine();
+		System.out.print("Type request code for nack: ");
+		String nackRequestCode = input.nextLine();
+		System.out.print("Time to run: ");
+		int timeToRun = input.nextInt();
+		input.nextLine();
+		
+		getACK(ackRequestCode, nackRequestCode, timeToRun);
+	}
+
+	private static int getACK(String ackRequestCode, String nackRequestCode, int numberOfSecondsToRun) {
+		long endTime = 0;
+		boolean lastCallHadErrors = false;
+		int packageNumber = 0, errorFreePackages = 0, errorPackages = 0, BER = 0;
+		ArrayList<byte[]> packageBytesWithErrors = new ArrayList<byte[]>();
+		ArrayList<Integer> packageResponseTime = new ArrayList<Integer>();
+		
+		PrintWriter writer = null;
+		try {
+			writer = new PrintWriter("ARQ_2.txt", "UTF-8");
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+			return -1;
+		} catch (UnsupportedEncodingException e) {
+			e.printStackTrace();
+			return -1;
+		}
+		
+		writer.println("[0] #No, [1] HasError, [2] Package, [3] Response time\n\n[0]\t[1]\t\t\t\t\t\t\t\t[2]\t\t\t\t\t\t\t\t[3]");
+		
+		Modem modem = new Modem();
+		modem.setSpeed(Utils.modemSpeed);
+		modem.setTimeout(Utils.modemTimeout);
+		modem.open(Utils.modemOpen);
+		
+		endTime = System.currentTimeMillis() + numberOfSecondsToRun * 1000;
+		while(System.currentTimeMillis() < endTime) {
+			long packageStartTime = 0, packageEndTime = 0;
+			String response = "";
+			
+			packageStartTime = System.currentTimeMillis();
+			if (!lastCallHadErrors) {
+				response = Utils.makeRequest(modem, ackRequestCode);
+				packageEndTime = System.currentTimeMillis();
+				packageResponseTime.add((int)(packageEndTime - packageStartTime - Utils.modemTimeout));
+			} else {
+				response = Utils.makeRequest(modem, nackRequestCode);
+				packageEndTime = System.currentTimeMillis();
+				packageResponseTime.add((int)(packageEndTime - packageStartTime - Utils.modemTimeout));
+			}
+			
+			Matcher matcher = pattern.matcher(response);
+			String[] packageAndFCS = (matcher.replaceAll(subst)).split(",");
+			if (packageAndFCS.length != 2 || packageAndFCS[0] == null || packageAndFCS[0].isEmpty()
+					|| packageAndFCS[1] == null || packageAndFCS[1].isEmpty()) {
+				System.out.println("Malformed response: " + response);
+				continue;
+			}
+			byte[] packageBytes = packageAndFCS[0].getBytes();
+			byte xor = packageBytes[0];
+			for (int i=1; i<packageBytes.length; ++i){
+				xor = (byte) (xor^packageBytes[i]);
+			}
+			
+			System.out.print("Package xor = " + xor + " came with xor code: " + packageAndFCS[1]);
+			if (xor != Integer.parseInt(packageAndFCS[1])) {
+				System.out.println(" Has errors");
+				
+				writer.print(packageNumber + 1 + "\t >\t");
+				writer.print(packageBytes[0]);
+				for (int i=1; i<packageBytes.length; ++i) {
+					writer.print("," + packageBytes[i]);
+				}
+				if (packageBytes.toString().length() < 56) {
+					writer.print("\t\t");
+				} else {
+					writer.print("\t");
+				}
+				writer.println(packageResponseTime.get(packageNumber));
+				
+				packageBytesWithErrors.add(packageBytes);
+				++errorPackages;
+				lastCallHadErrors = true;
+			} else {
+				System.out.println(" No errors");
+				
+				writer.print(packageNumber + 1 + "\t\t");
+				writer.print(packageBytes[0]);
+				for (int i=1; i<packageBytes.length; ++i) {
+					writer.print("," + packageBytes[i]);
+				}
+				if (packageBytes.toString().length() < 56) {
+					writer.print("\t\t");
+				} else {
+					writer.print("\t");
+				}
+				writer.println(packageResponseTime.get(packageNumber));
+				
+				for (byte[] errorPackage: packageBytesWithErrors) {
+					for (int i=0; i<packageBytes.length; ++i) {
+						int temp = errorPackage[i]^packageBytes[i];
+						BER += Integer.bitCount(temp);
+					}
+				}
+				
+				packageBytesWithErrors.clear();
+				++errorFreePackages;
+				lastCallHadErrors = false;
+			}
+			++packageNumber;
+		}
+		
+		writer.close();
+		modem.close();
+		
+		float allPackages = errorFreePackages + errorPackages;
+		System.out.println("Number of packages aquired: " + allPackages);
+		System.out.println("Error free packages = " + errorFreePackages + " --> " + (errorFreePackages / allPackages * 100));
+		System.out.println("Error packages = " + errorPackages + " --> " + (errorPackages / allPackages * 100));
+		System.out.println("Error bits = " + BER);
+		System.out.println("BER = " + ((float) BER)/((float)((allPackages) * 16 * 8)));
+		
+		return 1;
+	}
+}
diff --git a/src/Camera.java b/src/Camera.java
new file mode 100644
index 0000000..227c91c
--- /dev/null
+++ b/src/Camera.java
@@ -0,0 +1,66 @@
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.Scanner;
+
+import ithakimodem.Modem;
+
+public class Camera {
+	private static final Scanner input = new Scanner(System.in);
+	
+	public static void camera() {
+		System.out.print("Type request code: ");
+		String requestCode = input.nextLine();
+		System.out.print("Image filename (if a file with the same name already exists"
+				+ " it will be overwritten): ");
+		String filename = input.nextLine();
+		
+		getImage(requestCode, filename);
+	}
+	
+	private static boolean getImage(String requestCode, String imageFilaname) {
+		String imageString;
+		
+		Modem modem = new Modem();
+		modem.setSpeed(Utils.modemSpeed);
+		modem.setTimeout(Utils.modemTimeout);
+		modem.open(Utils.modemOpen);
+		
+		{
+			String response = "";
+			response = Utils.makeRequest(modem, requestCode);
+			if (response == null || response.isEmpty()) {
+				return false;
+			}
+			int startIndex = response.indexOf("" + (char) 255 + (char) 216),
+					endIndex = response.lastIndexOf("" + (char) 255 + (char) 217) + 2;
+			if (startIndex == -1 || endIndex == -1) {
+				return false;
+			}
+			imageString = response.substring(startIndex, endIndex);
+		}
+		
+		FileOutputStream fileOutputStream;
+		try {
+			fileOutputStream = new FileOutputStream(imageFilaname, false);
+			
+			char imageCharArray[] = imageString.toCharArray();
+			byte imageByteArray[] = new byte[imageCharArray.length];
+			for (int i=0; i<imageByteArray.length; ++i) {
+				imageByteArray[i] = (byte)((int) imageCharArray[i]);
+			}
+			fileOutputStream.write(imageByteArray, 0, imageByteArray.length);
+			fileOutputStream.flush();
+			fileOutputStream.close();
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+			return false;
+		} catch (IOException e) {
+			e.printStackTrace();
+			return false;
+		}
+
+		modem.close();
+		return true;
+	}
+}
diff --git a/src/ComputerNetworks.java b/src/ComputerNetworks.java
new file mode 100644
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--- /dev/null
+++ b/src/ComputerNetworks.java
@@ -0,0 +1,37 @@
+import java.util.Scanner;
+
+public class ComputerNetworks {
+	
+	public static void main(String[] args) {
+		final Scanner input = new Scanner(System.in);
+		String functionChoosen;
+		
+		System.out.print("Available functions\n"
+				+ "\t[1]: Ping ithaki server (ping)\n"
+				+ "\t[2]: Get camera image with or without error (cam)\n"
+				+ "\t[3]: Get GPS route image (gps)\n"
+				+ "\t[4]: Simulate ARQ communication (arq)\n"
+				+ "\t[0]: Exit (exit)\n"
+				+ "To choose, type either the number in the brackets or"
+				+ " the word in parentheses.\n");
+		while(true) {
+			System.out.print("\nSelect funtcion: ");
+			functionChoosen = input.nextLine();
+			if ("ping".equals(functionChoosen) || "1".equals(functionChoosen)) {
+				Ping.ping();
+			} else if ("cam".equals(functionChoosen) || "2".equals(functionChoosen)) {
+				Camera.camera();
+			} else if ("gps".equals(functionChoosen) || "3".equals(functionChoosen)) {
+				GPS.gps();
+			} else if ("arq".equals(functionChoosen) || "4".equals(functionChoosen)) {
+				ACK.ack();
+			} else if ("exit".equals(functionChoosen) || "0".equals(functionChoosen)) {
+				break;
+			} else {
+				System.out.println("Wrong usage! Please be carefull of the syntax.");
+			}
+		}
+		
+		input.close();
+	}
+}
diff --git a/src/GPS.java b/src/GPS.java
new file mode 100644
index 0000000..4bafb26
--- /dev/null
+++ b/src/GPS.java
@@ -0,0 +1,162 @@
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import ithakimodem.Modem;
+
+public class GPS {
+	private static final String extractGPGGALineRegex = ".*?(\\$.*)\\nSTOP.*";
+	private static final String extractGPGGALineSubst = "$1";
+	private static final Pattern extractGPGGALinePattern = Pattern.compile(extractGPGGALineRegex, Pattern.DOTALL);
+	
+	private static final String extractCoordinateRegex = ".+?,.+?,([0-9]+).(.+?),N,0(.+?).([0-9]+?),.+";
+	private static final String extractCoordinateSubst = "$1,$2,$3,$4";
+	private static final Pattern extractCoordinatePattern = Pattern.compile(extractCoordinateRegex);
+	
+	private static final Scanner input = new Scanner(System.in);
+
+	public static void gps() {
+		System.out.print("Type request code for the GPS : ");
+		String requestCode = input.nextLine();
+		System.out.print("Type any additional flags for the request: ");
+		String requestFlags = input.nextLine();
+		System.out.print("Enter number of coordinates to extract: ");
+		int numberOfCoordinates = input.nextInt();
+
+		List<String> coordinates = getCoordinates(requestCode, requestFlags, numberOfCoordinates);
+		
+		if (coordinates == null || coordinates.isEmpty()) {
+			System.out.println("Came with an empty List!");
+			return;
+		}
+		
+		input.nextLine(); //Clear input buffer
+		System.out.print("Should try to fetch the image? (y/n): ");
+		String fetchImage = input.nextLine();
+		while(true) {
+			if ("y".equals(fetchImage)) {
+				System.out.print("Image filename (if a file with the same name already exists"
+						+ " it will be overwritten): ");
+				String filename = input.nextLine();
+				
+				getImage(requestCode, coordinates, filename);
+
+				return;
+			} else if ("n".equals(fetchImage)) {
+				return;
+			}
+			System.out.print("Input malformed. Try again: ");
+			fetchImage = input.nextLine();
+		}
+	}
+
+	private static List<String> getCoordinates(String requestCode, String requestFlag, int coordinatesToExtract) {
+		List<String> coordinates, returnList = new ArrayList<String>();
+		String response = "";
+		
+		PrintWriter writer = null;
+		try {
+			writer = new PrintWriter("gps.txt", "UTF-8");
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+			return null;
+		} catch (UnsupportedEncodingException e) {
+			e.printStackTrace();
+			return null;
+		}
+
+		Modem modem = new Modem();
+		modem.setSpeed(Utils.modemSpeed);
+		modem.setTimeout(Utils.modemTimeout);
+		modem.open(Utils.modemOpen);
+		
+		response = Utils.makeRequest(modem, requestCode + requestFlag);
+		modem.close();
+		
+		if (response == null || response.isEmpty()) {
+			writer.close();
+			return null;
+		}
+		
+		final Matcher extractGPGGALineMatcher = extractGPGGALinePattern.matcher(response);
+		coordinates = new ArrayList<String>(Arrays.asList(extractGPGGALineMatcher.replaceAll(extractGPGGALineSubst).split("\n")));
+		for (String coordinate: coordinates) {
+			writer.println(coordinate);
+		}
+		writer.close();
+		writer.println(response);
+
+		for (int i=0; i<coordinates.size(); i+=(int)((coordinates.size() - 1)/ coordinatesToExtract)) {
+			String rawCoordinate = coordinates.get(i);
+			final Matcher extractCoordinateMatcher = extractCoordinatePattern.matcher(rawCoordinate);
+			String extractedCoordinate = extractCoordinateMatcher.replaceAll(extractCoordinateSubst);
+			
+			String[] coordinateSplitArray = extractedCoordinate.split(",");
+			String proccessedCoordinate = coordinateSplitArray[2];
+			proccessedCoordinate += (int)(Integer.parseInt(coordinateSplitArray[3].substring(0, 4)) * 0.006);
+			proccessedCoordinate += coordinateSplitArray[0];
+			proccessedCoordinate += (int)(Integer.parseInt(coordinateSplitArray[1]) * 0.006);
+			returnList.add(proccessedCoordinate);
+		}
+
+		return returnList;
+	}
+
+	private static boolean getImage(String requestCode, List<String> coordinates, String imageFilename) {
+		String imageString;
+		
+		for (String coordinate : coordinates) {
+			requestCode += "T=" + coordinate;
+		}
+		
+		Modem modem = new Modem();
+		modem.setSpeed(Utils.modemSpeed);
+		modem.setTimeout(Utils.modemTimeout);
+		modem.open(Utils.modemOpen);
+
+		{
+			String response = "";
+			response = Utils.makeRequest(modem, requestCode);
+			if (response == null || response.isEmpty()) {
+				return false;
+			}
+			int startIndex = response.indexOf("" + (char) 255 + (char) 216),
+					endIndex = response.lastIndexOf("" + (char) 255 + (char) 217) + 2;
+			if (startIndex == -1 || endIndex == -1) {
+				return false;
+			}
+			imageString = response.substring(startIndex, endIndex);
+		}
+		
+		FileOutputStream fileOutputStream;
+		try {
+			fileOutputStream = new FileOutputStream(imageFilename, false);
+			
+			char imageCharArray[] = imageString.toCharArray();
+			byte imageByteArray[] = new byte[imageCharArray.length];
+			for (int i=0; i<imageByteArray.length; ++i) {
+				imageByteArray[i] = (byte)((int) imageCharArray[i]);
+			}
+			fileOutputStream.write(imageByteArray, 0, imageByteArray.length);
+			fileOutputStream.flush();
+			fileOutputStream.close();
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+			return false;
+		} catch (IOException e) {
+			e.printStackTrace();
+			return false;
+		}
+
+		modem.close();
+		return true;
+	}
+}
diff --git a/src/Ping.java b/src/Ping.java
new file mode 100644
index 0000000..69fe2cd
--- /dev/null
+++ b/src/Ping.java
@@ -0,0 +1,56 @@
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.Scanner;
+
+import ithakimodem.Modem;
+
+public class Ping {
+	private static final Scanner input = new Scanner(System.in);
+	
+	public static void ping() {
+		System.out.print("Type request code: ");
+		String requestCode = input.nextLine();
+		System.out.print("Enter number of packages to request: ");
+		int numberOfPackages = input.nextInt();
+		input.nextLine(); //Clear input buffer
+		
+		pingServer(requestCode, numberOfPackages);
+	}
+	
+	private static boolean pingServer(String requestCode, int numberOfPackages) {
+		int[] timeDelayArray = new int[numberOfPackages];
+		long startTime = 0, endTime = 0;
+		
+		PrintWriter writer = null;
+		try {
+			writer = new PrintWriter("ping.txt", "UTF-8");
+		} catch (FileNotFoundException e) {
+			e.printStackTrace();
+			return false;
+		} catch (UnsupportedEncodingException e) {
+			e.printStackTrace();
+			return false;
+		}
+		
+		Modem modem = new Modem();
+		modem.setSpeed(Utils.modemSpeed);
+		modem.setTimeout(Utils.modemTimeout);
+		modem.open(Utils.modemOpen);
+		
+		for(int i=0; i<numberOfPackages; ++i){
+			String response = "";
+			
+			startTime = System.currentTimeMillis();
+			response = Utils.makeRequest(modem, requestCode);
+			endTime = System.currentTimeMillis();
+			
+			timeDelayArray[i] = (int)(endTime - startTime);
+			writer.println(response + "\t" + timeDelayArray[i]);
+		}
+		modem.close();
+		writer.close();
+		
+		return true;
+	}
+}
\ No newline at end of file
diff --git a/src/Utils.java b/src/Utils.java
new file mode 100644
index 0000000..cd01140
--- /dev/null
+++ b/src/Utils.java
@@ -0,0 +1,32 @@
+import ithakimodem.Modem;
+
+public class Utils {
+	static final int modemSpeed = 80000;
+	static final int modemTimeout = 1000;
+	static final String modemOpen = "ithaki";
+	
+	static String makeRequest(Modem modem, String requestCode) {
+		int responseBuffer;
+		String response = "";
+		
+		if (!modem.write((requestCode + "\r").getBytes())) {
+			return null;
+		}
+		
+		while (true) {
+			try {
+				responseBuffer=modem.read();
+				response += (char) responseBuffer;
+				
+				if (responseBuffer == -1) {
+					break;
+				}
+			} catch (Exception x) {
+				x.printStackTrace();
+				return null;
+			}
+		}
+		
+		return response;
+	}
+}