Data-Compression/ArithmeticCodingBinaryCompress.java at main · Neimat1/Data-Compression · GitHub

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import java.util.*;

public class ArithmeticCodingBinaryCompress {
    public static HashMap<Character, Integer> FrequencyForCharInString(String string) {
        HashMap<Character, Integer> map = new HashMap<>();
        for (int i = 0; i < string.length(); i++) {
            if (map.containsKey(string.charAt(i))) {
                map.put(string.charAt(i), map.get(string.charAt(i)) + 1);
            } else {
                map.put(string.charAt(i), 1);
            }
        }
        return map;
    }

    public static HashMap<Character, Float> ProbablityForCharInString(String string) {
        HashMap<Character, Integer> map = new HashMap<>();
        map = FrequencyForCharInString(string);
        HashMap<Character, Float> ProbMap = new HashMap<>();
        for (Map.Entry<Character, Integer> counter : map.entrySet()) {
            ProbMap.put(counter.getKey(), ((float) counter.getValue() / (float) string.length()));
        }
        return ProbMap;
    }

    public static ArrayList<Float> prob(HashMap<Character, Float> map) {
        ArrayList<Float> Low = new ArrayList<>();
        int i = 0;
        for (Map.Entry<Character, Float> counter : map.entrySet()) {
            Low.add(counter.getValue());
        }
        return Low;
    }

    public static HashMap<Character, Float> LoweMap(HashMap<Character, Float> map) {
        HashMap<Character, Float> mapLow = new HashMap<>();
        ArrayList<Float> basicBrobablity = prob(map);
        ArrayList<Float> lowRange = new ArrayList<>();
        ArrayList<Float> highRange = new ArrayList<>();
        int i = 0;
        for (Map.Entry<Character, Float> counter : map.entrySet()) {
            if (i == 0) {
                lowRange.add((float) 0);
                highRange.add(counter.getValue());
                mapLow.put(counter.getKey(), (float) i);
            } else {
                lowRange.add(highRange.get(i - 1));
                highRange.add(counter.getValue() + lowRange.get(i));
                mapLow.put(counter.getKey(), lowRange.get(i));

            }
            i++;
        }
        return mapLow;
    }

    public static HashMap<Character, Float> HigheMap(HashMap<Character, Float> map) {
        HashMap<Character, Float> mapHigh = new HashMap<>();
        ArrayList<Float> highRange = new ArrayList<>();
        int i = 0;
        for (Map.Entry<Character, Float> counter : map.entrySet()) {
            if (i == 0) {
                highRange.add(counter.getValue());
                mapHigh.put(counter.getKey(), highRange.get(i));
            } else {
                highRange.add(counter.getValue() + highRange.get(i - 1));
            }
            i++;
        }
        int j = 0;
        for (Map.Entry<Character, Float> counter : map.entrySet()) {
            highRange.add(counter.getValue());
            mapHigh.put(counter.getKey(), highRange.get(j));
            j++;
        }
        return mapHigh;
    }

    public static HashMap<Character, Float> RangeMap(HashMap<Character, Float> map) {
        HashMap<Character, Float> mapRangeLow = new HashMap<>();
        HashMap<Character, Float> mapRangeUpper = new HashMap<>();
        HashMap<Character, Float> mapRange = new HashMap<>();

        mapRangeLow = LoweMap(map);
        mapRangeUpper = HigheMap(map);
        int j = 0;
        for (Map.Entry<Character, Float> counter : map.entrySet()) {
            mapRange.put(counter.getKey(), counter.setValue(mapRangeUpper.get(counter.getKey()) - mapRangeLow.get(counter.getKey())));
            j++;
        }
        return mapRange;
    }

    public static int KValue(float Value){
        int K=0;
        while(!((1/Math.pow(2,K))<Value))
            K++;
        return K;
    }
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String inputTextWillCompress = input.nextLine();

        HashMap<Character, Float> mapCharAndProbab = new HashMap<>();
        HashMap<Character, Float> mapRangeLow = new HashMap<>();
        HashMap<Character, Float> mapRangeUpper = new HashMap<>();
        HashMap<Character, Float> mapRange = new HashMap<>();

        mapCharAndProbab = ProbablityForCharInString(inputTextWillCompress);
        Float minValue = Collections.min(mapCharAndProbab.values());
        int KVal=KValue(minValue);
        mapRangeLow = LoweMap(mapCharAndProbab);
        mapRangeUpper = HigheMap(mapCharAndProbab);
        mapRange = RangeMap(mapCharAndProbab);
        System.out.println("High Range : " + mapRangeUpper);
        System.out.println("Low Range : " + mapRangeLow);
        System.out.println("Range : " + mapRange);
        String binary="";
        Character tempraryChar = inputTextWillCompress.charAt(0);
        for (int i = 0; i < inputTextWillCompress.length(); i++) {
            if(i==0){
                tempraryChar = inputTextWillCompress.charAt(i);
                while(!(mapRangeLow.get(tempraryChar)<=0.5&&
                        mapRangeUpper.get(tempraryChar)>=0.5)){
                    while (mapRangeLow.get(tempraryChar)>0.5&&
                            mapRangeUpper.get(tempraryChar)>0.5){
                        mapRangeLow.put(inputTextWillCompress.charAt(i), (float) ((mapRangeLow.get(tempraryChar)-0.5)*2));
                        mapRangeUpper.put(inputTextWillCompress.charAt(i), (float) ((mapRangeUpper.get(tempraryChar)-0.5)*2));
                        binary=binary+"1";
                    }
                    while (mapRangeLow.get(tempraryChar)<0.5&&
                            mapRangeUpper.get(tempraryChar)<0.5){
                        mapRangeLow.put(inputTextWillCompress.charAt(i), ((mapRangeLow.get(tempraryChar)*2)));
                        mapRangeUpper.put(inputTextWillCompress.charAt(i), ((mapRangeUpper.get(tempraryChar)*2)));
                        binary=binary+"0";
                    }
                }

            }
            else{
                /*
                 * Lower(symbol)=lower(الحرف اللي قبلي)+Range(الحرف اللي قبلي )*low(symbol)
                 * Upper(symbol)=upper(الحرف اللي قبلي)+Range(الحرف اللي قبلي )*upper(symbol)
                 * */
                mapRangeLow.put(inputTextWillCompress.charAt(i),
                        (mapRangeLow.get(tempraryChar) + (mapRangeUpper.get(tempraryChar) - mapRangeLow.get(tempraryChar)) * mapRangeLow.get(inputTextWillCompress.charAt(i))));

                mapRangeUpper.put(inputTextWillCompress.charAt(i),
                        (mapRangeLow.get(tempraryChar) + (mapRangeUpper.get(tempraryChar) - mapRangeLow.get(tempraryChar)) * mapRangeUpper.get(inputTextWillCompress.charAt(i))));

                tempraryChar = inputTextWillCompress.charAt(i);
                while(!(mapRangeLow.get(tempraryChar)<=0.5&&
                        mapRangeUpper.get(tempraryChar)>=0.5)){
                    while (mapRangeLow.get(tempraryChar)>0.5&&
                            mapRangeUpper.get(tempraryChar)>0.5){
                        mapRangeLow.put(inputTextWillCompress.charAt(i), (float) ((mapRangeLow.get(tempraryChar)-0.5)*2));
                        mapRangeUpper.put(inputTextWillCompress.charAt(i), (float) ((mapRangeUpper.get(tempraryChar)-0.5)*2));
                        binary=binary+"1";
                    }
                    while (mapRangeLow.get(tempraryChar)<0.5&&
                            mapRangeUpper.get(tempraryChar)<0.5){
                        mapRangeLow.put(inputTextWillCompress.charAt(i), ((mapRangeLow.get(tempraryChar)*2)));
                        mapRangeUpper.put(inputTextWillCompress.charAt(i), ((mapRangeUpper.get(tempraryChar)*2)));
                        binary=binary+"0";
                    }
                }
                /*
                  *System.out.println(" Character is : " + tempraryChar);
                  *System.out.println("the lower range of  Charcter is : " + mapRangeLow.get(tempraryChar));
                  *System.out.println("the Upper range of  Charcter is : " + mapRangeUpper.get(tempraryChar));
                  *System.out.println("------------------------------------------------------------------------ ");
                  *System.out.println("------------------------------------------------------------------------ ");
                  *System.out.println("------------------------------------------------------------------------ ");
                */
            }
        }
        //System.out.println("Float for compress data is  : " + ((mapRangeLow.get(tempraryChar) + mapRangeUpper.get(tempraryChar)) / 2));
        binary=binary+"1";
        for(int i=1;i<KVal;i++)
            binary=binary+"0";
        System.out.println("Binary for compress data is  : " + binary );
    }
}