feat: implemented file compression via huffman encoding

Author: Satvik-Singh192

Src/FileCompression/input.txt

@@ -0,0 +1,62 @@
+aaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
+aaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnaaaabbcddddeeeeffffggghhhiiijjklllmmnoopqqrrrssstttuuuvwwwxxyyzzz
+thequickbrownfoxjumpsoverthelazydogthequickbrownfoxjumpsoverthelazydog
+aaabbbbcccccdddddeeeeeffffffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuu
+huffmanencodingexampletextwithrandomlettersandvaryingfrequencies
+aaaaaaaabbbbccccccdddddddeeeeeeeeeefffffffggghhhiiijkllllmmnnopprrrsstttt
+fnaidfaoisdfhaoidfnasfnakdbfkasjdbjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldnajjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjkjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjasbdjasbdoabnsldna

Src/FileCompression/main.cpp

@@ -0,0 +1,100 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+struct Node {
+    char ch;
+    int freq;
+    Node* left;
+    Node* right;
+
+    Node(char c, int f, Node* l = nullptr, Node* r = nullptr)
+        : ch(c), freq(f), left(l), right(r) {}
+};
+struct Compare {
+    bool operator()(Node* a, Node* b) {
+        return a->freq > b->freq;
+    }
+};
+unordered_map<char,string> encodings;
+
+void prefix(Node* root,string s){
+    if(root->ch!='*'){
+        encodings[root->ch]=s;
+        return;
+    }
+    if(root->left !=NULL)prefix(root->left,s+'0');
+    if(root->right !=NULL)prefix(root->right, s+'1');
+}
+
+int main(){
+    ifstream file("input.txt");
+    if(!file.is_open()){
+        cout<<"file could not be opened"<<endl;
+        return 1;
+    }
+    unordered_map<char,int> hashmap;
+    char ch;
+    while(file.get(ch)){
+        hashmap[ch]++;
+    }
+    file.close();
+    priority_queue<Node*, vector<Node*>, Compare> pq;
+    string orignal="";
+
+
+    for(auto it=hashmap.begin();it!=hashmap.end();it++){
+        char c=it->first;
+        orignal+=c;
+        int f=it->second;
+        cout<<c<<" : "<<f<<endl;
+
+        Node* a = new Node(c, f, NULL, NULL);
+        pq.push(a);
+    }
+    
+    while (pq.size() > 1) {
+        Node* left = pq.top(); pq.pop();
+        Node* right = pq.top(); pq.pop();
+
+        Node* parent = new Node('*', left->freq + right->freq, left, right);
+        pq.push(parent);
+    }
+    Node* root=pq.top();
+    prefix(root,"");
+
+    for(auto it=encodings.begin();it!=encodings.end();it++){
+        cout<< it->first<< " : "<<it->second<<endl;
+    }
+
+    string bitstream="";
+    for(char c:orignal){
+        bitstream+=encodings[c];
+    }
+    vector<unsigned char> bytes;
+    unsigned char current=0;
+    int count=0;
+
+    for(char bit: bitstream){
+        current=current>>1|bit-'0';
+        count++;
+
+        if(count==8){
+            bytes.push_back(current);
+            current=0;
+            count=0;
+        }
+    }
+    if(count > 0) {
+        current <<= (8 - count);
+        bytes.push_back(current);
+    }
+
+    ofstream out("output.bin",ios::binary);
+    for(unsigned char b:bytes){
+        out.write((char*)&b,1);
+
+    }
+    out.close();
+
+
+}