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utils.cpp
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utils.cpp
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#include "utils.hpp"
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <string>
#include <cryptopp/aes.h>
#include <cryptopp/modes.h>
#include <cryptopp/filters.h>
#include <cryptopp/osrng.h>
using namespace std;
size_t hashSecret(string secret){
hash<string> hasher;
size_t hash = hasher(secret);
return hash;
}
string xorEncryptDecrypt(const string& input, const string& key) {
string output = input;
for (size_t i = 0; i < input.size(); ++i) {
output[i] = input[i] ^ key[i % key.size()]; // Operacja XOR na pojedynczym znaku
}
return output;
}
bool compareIgnoringCapital(char a, char b) {
return std::tolower(a) < std::tolower(b);
}
void sortWordsV(vector<string>& words){
sort(words.begin(), words.end(), [](const std::string& a, const std::string& b) {
return std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end(), compareIgnoringCapital);
});
}
string serialize(vector<string> words){
string serializedWordsChain;
for (const string& word : words) {
serializedWordsChain += to_string(word.size())+ word;
}
return serializedWordsChain;
}
vector<string> deserialize(string serializedWord){
vector<string> res;
int i = 0;
while (i < serializedWord.size()) {
string hop = "";
while (isdigit(serializedWord[i])){
hop.push_back(serializedWord[i]);
i++;
}
int ihop = atoi(hop.c_str());
string actual = serializedWord.substr(i, ihop);
res.push_back(actual);
i = i + ihop;
}
return res;
}
void writeTableToDB(fstream& db, dbTable& dbTable){
sortWordsV(dbTable.words);
string serializedWordsChain = serialize(dbTable.words);
string encrypted = xorEncryptDecrypt(serializedWordsChain, dbTable.secret);
string encryptedTableName = xorEncryptDecrypt(dbTable.tableName, dbTable.secret);
size_t wordsSize = encrypted.size();
size_t tableNameSize = encryptedTableName.size();
short wordsByteLenght = wordsSize + sizeof(wordsSize) + tableNameSize;
size_t hash = hashSecret(dbTable.secret);
size_t hashSize = sizeof(hash);
db.write(reinterpret_cast<char*>(&hashSize), sizeof(hashSize));
db.write(reinterpret_cast<char*>(&hash), hashSize);
db.write(reinterpret_cast<char*>(&wordsByteLenght), sizeof(wordsByteLenght));
db.write(reinterpret_cast<char*>(&tableNameSize), sizeof(tableNameSize));
db.write(encryptedTableName.c_str(), tableNameSize);
db.write(reinterpret_cast<char*>(&wordsSize), sizeof(wordsSize));
db.write(encrypted.c_str(), wordsSize);
}
dbTable readTableFromDB(fstream& db, string secret, string searchTable) {
dbTable Table;
size_t hashSize;
size_t hash;
short hopSize;
db.read(reinterpret_cast<char*>(&hashSize), sizeof(hashSize));
db.read(reinterpret_cast<char*>(&hash), sizeof(hash));
db.read(reinterpret_cast<char*>(&hopSize), sizeof(hopSize));
if(hashSecret(secret) != hash) {
db.seekg(hopSize, ios::cur);
return Table;
}
size_t tableNameSize;
db.read(reinterpret_cast<char*>(&tableNameSize), sizeof(tableNameSize));
char* tableNameBuffer = new char[tableNameSize];
db.read(tableNameBuffer, tableNameSize);
string tableName(tableNameBuffer, tableNameSize);
delete[] tableNameBuffer;
Table.tableName = xorEncryptDecrypt(tableName, secret);
if(Table.tableName != searchTable && searchTable != "."){
db.seekg((hopSize - tableNameSize), ios::cur);
dbTable emptyTable;
return emptyTable;
}
//
size_t wordsSize;
db.read(reinterpret_cast<char*>(&wordsSize), sizeof(wordsSize));
char* contentBuffer = new char[wordsSize];
db.read(contentBuffer, wordsSize);
string content(contentBuffer, wordsSize);
delete[] contentBuffer;
Table.words = deserialize(xorEncryptDecrypt(content, secret));
return Table;
}
dbTable readTableFromDBSafe(fstream& db){
}
vector<dbTable> readAllTablesFromDB(fstream& db, string secret, string searchTable) {
vector<dbTable> tables = {};
while (db.good()) {
dbTable table = readTableFromDB(db, secret, searchTable);
if(table.words.size() > 0) tables.push_back(table);
}
return tables;
}
int modifyTable(fstream& db, string secret, string modifyTableName, vector<string> wordsToAdd, vector<string> wordsToDrop){
dbTable tableToModify;
vector<dbTable> temp = readAllTablesFromDB(db, secret, modifyTableName);
if(temp.size() == 0){
return 1;
}
tableToModify = temp[0];
for (const string& word : wordsToDrop) {
tableToModify.words.erase(
std::remove(tableToModify.words.begin(), tableToModify.words.end(), word),
tableToModify.words.end()
);
}
for(const string& word : wordsToAdd){
tableToModify.words.push_back(word);
}
return 0;
}