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FanoDecompression.cpp
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FanoDecompression.cpp
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#pragma once
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <map>
#include "Fano.h"
#include "BitBufferForDecompress.h"
#include "MyExeption.h"
using namespace std;
/// Ãëàâíàÿ ôóíêöèÿ
/**
* Ôóíêöèÿ, ãäå ïðîèñõîäíÿò âñå âûçîâû îñòàëüíûõ ôóíêöèé,
* ôîðìèðîâàíèå íàçâàíèÿ ôàéëà
@param file_name Èìÿ ôàéëà, êîòîðîå íóæíî ñ÷èòàòü
*/
void Fano::decompression(char* comp_file_name, char* out_file_name) {
ifstream inFile(comp_file_name, 'b');
if (!inFile.is_open()) {
throw File_not_found(comp_file_name);
}
ofstream outFile(out_file_name);
if (!outFile.is_open()) {
throw File_not_found(out_file_name);
}
outFile.close();
outFile.open(out_file_name, 'b');
decomp_add_symbol(inFile); // ñ÷èòûâàíèå ñèìâîëîâ
symbol_sort();
create_tree();
create_map_decomp();
file_decompression(inFile, outFile);
}
/// Ìåòîä, ñ÷èòûâàþùèé ôàéë
/**
* Ìåòîä, ñ÷èòûâàþùèé ñèìâîëû.Ñïåðâà ñ÷èòûâàåòñÿ êîëè÷åñâî âñåõ
* ñèìâîëîâ. Ïîòîì ñ÷èòûâàåòñÿ êîëè÷åñòâî óíèêàëüíûõ ñèìâîëîâ.
* Ïîñëå ýòîãî ïðîèñõîäèò ñ÷èòûâàíèå {ñèìâîë, êîëè÷åñòâî åãî â ôàéëå}
@param inf Ôàéë, îòêóäà ñ÷èòûâàåì ñèìâîëû
*/
void Fano::decomp_add_symbol(ifstream& inf) {
int size;
inf.seekg(0, ios_base::beg);
inf >> symbolNumber;
inf >> size;
int i = 0;
inf.get();
do {
SymbolRate symbol;
symbol.symbol = inf.get();
inf >> symbol.frequancy;
SRate.push_back(symbol);
inf.get();
i++;
} while (i < size);
}
/// Ôóíêöèÿ äëÿ ðàçàðõèâèðîâàíèÿ ôàéëà
/**
* Ñ÷èòûâàåì ñèìâîëû èç ôàéëà â Buffer.
* Ïîñëå ýòîãî íàõîäèì ñèìâîë ñîîòâåòñòâóþùèé
* ïåðâûì n ñèìâîëàì èç Buffer-a è âñòàâëÿåì åãî
* â âûõîäíîé ôàéë
@param inf Ôàéë äëÿ ÷òåíèÿ
@param outf Ôàéë äëÿ çàïèñè
*/
void Fano::file_decompression(ifstream& inf, ofstream& outf) {
Buffer_decomp buffr;
for (int i = 0; !inf.eof(); i++) {
unsigned char symbol_t = inf.get();
buffr.push(symbol_t);
}
string* vec = buffr.get_buf();
unsigned char a;
int vec_it = 0;
for (int i = 0; (i < symbolNumber) && (vec->size() >= 8); i++) {//ñ÷åò÷èê ñèìâîëîâ
a = my_find(*vec, vec_it);
outf << a;
}
}
/// Ôóíêöèÿ íàõîæäåíèÿ ýëåìåíòà ïî êîäó
/**
* Ôóíêöèÿ íàõîäèò òàêîé ñèìâîë èç map,
* êîä êîòîðîãî ðàâåí ñèìâîëàì èç Buffer, íà÷èíàÿ èç
* Buffer[vec_it].
@param vec Buffer äëÿ ÷òåíèÿ
@param vec_it Óêàçàòåëü íà ïîçèöèþ â Buffer
*/
char Fano::my_find(string& vec, int& vec_it) {
string tmp;
for (int i = vec_it; i < vec.size(); i++) {
tmp.push_back(vec[i]);
map<string, char>::iterator it = fMap_decomp->find(tmp);
if ((it) != fMap_decomp->end()) {
vec_it = vec_it + it->first.size();
return it->second;
}
}
return -1;
}