Huffman-zip/unzip.cpp at main · nullptr088/Huffman-zip · GitHub

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#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define ln '\n'
using namespace std;
ifstream fin("file.myzip", ios::binary);
ofstream fout("new.txt");

uint8_t len, x, y;
char b, tmp;
string s;
int nr;

unordered_map<string, char> mp;

int main(){
    fin.get(tmp);
    len = static_cast<uint8_t>(tmp);

    for(int i = 0; i < len; i++){
        fin.get(b);
        fin.get(tmp);
        x = static_cast<uint8_t>(tmp);
        int copie = x;
        while(copie > 0){
            fin.get(tmp);
            y = static_cast<uint8_t>(tmp);
            nr = max(8 - copie, 0);
            for(int j = 7; j >= nr; j--)
                s += (((y >> j) & 1) == 0 ? '0' : '1');
            copie -= 8;
        }
        mp[s] = b;
        s = "";
    }

    s = "";
    while(fin.get(b)){
        x = static_cast<uint8_t>(b);
        for(int i = 7; i >= 0; i--){
            s += (((x >> i) & 1) == 0 ? '0' : '1');
            auto it = mp.find(s);
            if(it != mp.end()){
                fout<<it->second;
                s = "";
            }
        }
    }
}