commit
						a60f4ac045
					
				
							
								
								
									
										6
									
								
								.gitignore
									
									
									
									
										vendored
									
									
								
							
							
						
						
									
										6
									
								
								.gitignore
									
									
									
									
										vendored
									
									
								
							@ -1,3 +1,9 @@
 | 
			
		||||
*~
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		||||
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gmon\.out
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		||||
/cmake-build-debug/Makefile
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		||||
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cmake-build-debug/
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		||||
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\.idea/
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*.lzw
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		||||
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@ -8,7 +8,7 @@ set(TGT "projet_lzw")
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set(${TGT}_VERSION_MAJOR 0)
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set(${TGT}_VERSION_MINOR 1)
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set(CXX_COVERAGE_COMPILE_FLAGS "-pedantic -Wall -Wextra -Wold-style-cast -Woverloaded-virtual -Wfloat-equal -Wwrite-strings -Wpointer-arith -Wcast-qual -Wcast-align -Wconversion -Wsign-conversion -Wshadow -Weffc++ -Wredundant-decls -Wdouble-promotion -Winit-self -Wswitch-default -Wswitch-enum -Wundef -Winline -Wunused -Wnon-virtual-dtor")
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set(CXX_COVERAGE_COMPILE_FLAGS "-pedantic -Wall -Wextra -Wold-style-cast -Woverloaded-virtual -Wfloat-equal -Wwrite-strings -Wpointer-arith -Wcast-qual -Wcast-align -Wconversion -Wsign-conversion -Wshadow -Weffc++ -Wredundant-decls -Wdouble-promotion -Winit-self -Wswitch-default -Wswitch-enum -Wundef -Winline -Wunused -Wnon-virtual-dtor -pthread")
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set(CMAKE_CXX_FLAGS_DEBUG "${CXX_COVERAGE_COMPILE_FLAGS} -DDebug -g -pg")
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set(CMAKE_CXX_FLAGS_RELEASE "${CXX_COVERAGE_COMPILE_FLAGS} -O3")
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@ -18,19 +18,19 @@ using dic_t = std::map<std::pair<uint32_t, uint8_t>, uint32_t>;
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 *  caractère se référant au dernier caractère de la chaine courante. Si le
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 *  numéro de chaine est -1, alors il s’agit du premier caractère de la chaine,
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 *  et la valeur renvoyée sera la valeur ASCII du caractère. La fonction renvoie
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 *  une paire bool/uint16_t, la valeur booléene indiquant si une nouvelle fut
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 *  ajoutée dans le dictionnaire ou non, et le uint16_t indiquant la valeur
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 *  une paire bool/uint32_t, la valeur booléene indiquant si une nouvelle fut
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 *  ajoutée dans le dictionnaire ou non, et le uint32_t indiquant la valeur
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 *  numérique de la chaîne dans le dictionnaire.
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 *
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 *  \param dictionary Dictionnaire
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 *  \param nr_chaine Numéro de la chaine précédant le caractères \p c dans \p dictionary
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 *  \param c Caractère suivant la chaine de caractères \p nr_chaine
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 *  \return std::pair<bool, uint16_t>
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 *  \return std::pair<bool, uint32_t>
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 */
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const std::pair<bool, uint32_t>
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dico(std::map<std::pair<uint32_t, uint8_t>, uint32_t> &t_dictionary,
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     uint32_t t_nr_chaine, uint8_t t_c) {
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  if (t_nr_chaine == 0xFFFFFFFF)
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  if (t_nr_chaine == 0xFFFF)
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    return std::make_pair(true, t_c);
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  auto &e = t_dictionary[std::make_pair(t_nr_chaine, t_c)];
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  return (e) ? std::make_pair(true, e)
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@ -11,8 +11,7 @@
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/// \brief Recherche ou ajout de chaine dans le dictionnaire
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const std::pair<bool, std::uint32_t>
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dico(std::map<std::pair<std::uint32_t, std::uint8_t>, std::uint32_t>
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         &t_dictionary,
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     std::uint32_t t_nr_chaine, std::uint8_t t_c);
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dico(std::map<std::pair<std::uint32_t, std::uint8_t>, std::uint32_t> &,
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     uint32_t, uint8_t);
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#endif /* LZW_SRC_COMMON_H_ */
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		||||
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		||||
							
								
								
									
										152
									
								
								src/compress.cc
									
									
									
									
									
								
							
							
						
						
									
										152
									
								
								src/compress.cc
									
									
									
									
									
								
							@ -5,58 +5,67 @@
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#include "compress.hh"
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#include "utf8.hh"
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#include <cassert>
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#include <cstdlib>
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#include <fstream>
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#include <iostream>
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#include <thread>
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#ifdef Debug
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constexpr bool debug_mode = true;
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#else
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constexpr bool debug_mode = false;
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#endif
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using dict_t = std::map<std::pair<uint32_t, uint8_t>, uint32_t>;
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using ustring = std::basic_string<uint8_t>; // chaine non encodée
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using uvec = std::vector<uint32_t>; // chaine encodée
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using ustring = std::basic_string<uint8_t>; // chaîne non encodée
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using uvec = std::vector<uint32_t>;         // chaîne encodée
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using std::printf;
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void join_and_write(
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    std::vector<std::pair<std::unique_ptr<std::thread>, uvec>> &t_threads,
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    FILE *t_out) {
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  for (auto &elem : t_threads) {
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    (*elem.first).join();
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  }
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  for (auto &elem : t_threads) {
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    for (const auto c : elem.second) {
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      write_utf8(t_out, c);
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    }
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  }
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  t_threads.clear();
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}
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/**
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 *  La chaine de caractère \p text est lue caractère par caractère, et est et
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 *  La chaîne de caractère \p t_text est lue caractère par caractère, et est et
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 *  selon la valeur de retour de la fonction \ref dico (permettant dans le même
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 *  temps la création du dictionnaire), on rajoute un mot ou pas dans le vecteur
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 *  de caractères UTF-8 représentant des mots de chars compressés. La fonction
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 *  renvoie ledit vecteur de uint32_t.
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 *  renvoie ledit vecteur de uint32_t via le paramètre \p t_res.
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 *
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 *  \param t_text Chaine de caractères uint8_t représentant le fichier d'entrée
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 *  \param t_dictionary Dictionnaire de compression
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 *  \return std::vector<uint16_t>
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 *  \param[in] t_text Chaîne de caractères uint8_t représentant le fichier
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 * d'entrée \param[out] t_res Chaîne de caractères de sortie
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 */
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const uvec lzw_compress(const ustring &t_text, dict_t &t_dictionary) {
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void lzw_compress(const std::vector<char> &t_text, uvec &t_res) {
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  dict_t dictionary{};
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  std::puts("Compressing...");
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  uvec res{};
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  uint32_t w = 0xFFFFFFFF;
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  uint32_t len = 0;
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  uint32_t w = 0xFFFF;
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  constexpr size_t DICT_MAX = 7936; /* 12 bits */
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#ifdef Debug
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  size_t progress = 0;
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#endif
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  for (const auto &c : t_text) {
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    ++len;
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#ifdef Debug
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    printf("\rprogress: %zu / %zu", ++progress, t_text.size());
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#endif
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    if (/* len > LENGTH_MAX  || */ t_dictionary.size() >= DICT_MAX) {
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      res.push_back(static_cast<uint32_t>(w));
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      w = c;
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      len = 0;
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    } else if (const auto &[exists, pos] = dico(t_dictionary, w, c); exists) {
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    if (dictionary.size() >= DICT_MAX) {
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      t_res.push_back(static_cast<uint32_t>(w));
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      w = static_cast<uint32_t>(c);
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    } else if (const auto &[exists, pos] =
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                   dico(dictionary, w, static_cast<std::uint8_t>(c));
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               exists) {
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      w = pos;
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    } else {
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      res.push_back(static_cast<uint32_t>(w));
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      w = c;
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      len = 0;
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      t_res.push_back(static_cast<uint32_t>(w));
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      w = static_cast<std::uint8_t>(c);
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    }
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  }
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  printf("\n");
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  return res;
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}
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/**
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@ -73,41 +82,66 @@ const uvec lzw_compress(const ustring &t_text, dict_t &t_dictionary) {
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void compress(const std::string &t_in_file, const char *t_out_file) {
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  // Fichier d’entrée
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  std::ifstream input_file{t_in_file};
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  if (!input_file.is_open()) {
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    std::cerr << "Error at " << __FILE__ << ":" << __LINE__ - 2
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              << ": could not open output file \"" << t_in_file
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              << "\". Aborting...\n";
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    exit(1);
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  }
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  // Fichier de sortie
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  FILE *out = (t_out_file)
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                  ? fopen(t_out_file, "wb")
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                  : fopen(std::string{t_out_file, ".lzw"}.c_str(), "wb");
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  const char *filename = (t_out_file) ? t_out_file : "output.lzw";
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  FILE *out = fopen(filename, "wb");
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  if (!out) {
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    std::cerr << "Error at " << __FILE__ << ":" << __LINE__ - 4
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              << ": could not open output file \"" << filename
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              << "\". Aborting...\n";
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    input_file.close();
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    exit(1);
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  }
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  input_file.seekg(0, std::ios::end);
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  // string contenant le fichier d’entrée
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  ustring str(static_cast<unsigned long>(input_file.tellg()),
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              static_cast<unsigned char>(0));
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  input_file.seekg(0, std::ios::beg);
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  // thread pool
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  std::vector<std::pair<std::unique_ptr<std::thread>, uvec>> threads{};
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		||||
 | 
			
		||||
  // assignation du contenu du fichier à str
 | 
			
		||||
  str.assign((std::istreambuf_iterator<char>(input_file)),
 | 
			
		||||
             std::istreambuf_iterator<char>());
 | 
			
		||||
  // char chunk[32768];
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		||||
  std::vector<char> chunk(32768, 0);
 | 
			
		||||
  while (input_file.read(chunk.data(),
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                         static_cast<std::streamsize>(chunk.size()))) {
 | 
			
		||||
    threads.emplace_back(nullptr, uvec{});
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		||||
    threads.back().first = std::unique_ptr<std::thread>(
 | 
			
		||||
        new std::thread{lzw_compress, chunk, ref(threads.back().second)});
 | 
			
		||||
    assert(threads.back().first);
 | 
			
		||||
    if (threads.size() >= 8) {
 | 
			
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      join_and_write(threads, out);
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		||||
    }
 | 
			
		||||
  }
 | 
			
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 | 
			
		||||
  printf("Size of input file: %zu\n", str.size());
 | 
			
		||||
  if (!threads.empty()) {
 | 
			
		||||
    join_and_write(threads, out);
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		||||
  }
 | 
			
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 | 
			
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  dict_t dictionary{};
 | 
			
		||||
 | 
			
		||||
  const auto comp_str{lzw_compress(str, dictionary)};
 | 
			
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 | 
			
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  printf("\n############################################\n");
 | 
			
		||||
  printf("                Compressed!\n");
 | 
			
		||||
  printf("############################################\n\n");
 | 
			
		||||
  printf("Size of compressed string: %zu\n", comp_str.size());
 | 
			
		||||
  printf("Size of dictionary: %zu\n", dictionary.size());
 | 
			
		||||
  printf("Compression ratio: %.10f\n",
 | 
			
		||||
         static_cast<double>(str.size() / comp_str.size()));
 | 
			
		||||
 | 
			
		||||
  for(const auto c : comp_str)
 | 
			
		||||
    write_utf8(out, c);
 | 
			
		||||
  if (input_file.tellg() != std::ios::end) {
 | 
			
		||||
    std::puts("Leftovers, compressing...");
 | 
			
		||||
    {
 | 
			
		||||
      const auto prev_pos = input_file.tellg();
 | 
			
		||||
      input_file.seekg(0, std::ios::end);
 | 
			
		||||
      chunk.reserve(static_cast<size_t>(input_file.tellg() - prev_pos));
 | 
			
		||||
      input_file.seekg(prev_pos, std::ios::beg);
 | 
			
		||||
      std::istreambuf_iterator<char> itr(input_file);
 | 
			
		||||
      for (std::streamoff i = 0; i < prev_pos; ++i, ++itr)
 | 
			
		||||
        ;
 | 
			
		||||
      chunk.assign((itr), std::istreambuf_iterator<char>());
 | 
			
		||||
    }
 | 
			
		||||
    uvec ret{};
 | 
			
		||||
    lzw_compress(chunk, ret);
 | 
			
		||||
    for (const auto c : ret) {
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("%c\t", c);
 | 
			
		||||
      }
 | 
			
		||||
      write_utf8(out, c);
 | 
			
		||||
    }
 | 
			
		||||
  }
 | 
			
		||||
 | 
			
		||||
  fclose(out);
 | 
			
		||||
  input_file.close();
 | 
			
		||||
 | 
			
		||||
  return;
 | 
			
		||||
}
 | 
			
		||||
 | 
			
		||||
@ -8,14 +8,12 @@
 | 
			
		||||
 | 
			
		||||
#include "common.hh"
 | 
			
		||||
#include <vector>
 | 
			
		||||
#include <iostream>
 | 
			
		||||
 | 
			
		||||
/// \brief Compression d'une chaine de caractères
 | 
			
		||||
const std::vector<std::uint32_t>
 | 
			
		||||
lzw_compress(const std::basic_string<uint8_t> &t_text,
 | 
			
		||||
         std::map<std::pair<std::uint32_t, std::uint8_t>, std::uint32_t>
 | 
			
		||||
             &t_dictionary);
 | 
			
		||||
void lzw_compress(const std::vector<char> &, std::vector<std::uint32_t> &);
 | 
			
		||||
 | 
			
		||||
/// \brief Wrapper de \ref lzw_compress
 | 
			
		||||
void compress(const std::string &t_in_file, const char *t_out_file);
 | 
			
		||||
void compress(const std::string &, const char *);
 | 
			
		||||
 | 
			
		||||
#endif /* LZW_SRC_COMPRESS_H_ */
 | 
			
		||||
 | 
			
		||||
							
								
								
									
										80
									
								
								src/main.cc
									
									
									
									
									
								
							
							
						
						
									
										80
									
								
								src/main.cc
									
									
									
									
									
								
							@ -6,6 +6,12 @@
 | 
			
		||||
 *
 | 
			
		||||
 */
 | 
			
		||||
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
constexpr bool debug_mode = true;
 | 
			
		||||
#else
 | 
			
		||||
constexpr bool debug_mode = false;
 | 
			
		||||
#endif
 | 
			
		||||
 | 
			
		||||
#include "compress.hh"
 | 
			
		||||
#include "getopt.h"
 | 
			
		||||
 | 
			
		||||
@ -48,16 +54,17 @@ void help() {
 | 
			
		||||
}
 | 
			
		||||
 | 
			
		||||
int main(int argc, char *argv[]) {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
  for (int i = 0; i < argc; ++i)
 | 
			
		||||
    printf("argv[%d] = %s\n", i, argv[i]);
 | 
			
		||||
#endif
 | 
			
		||||
 | 
			
		||||
  if constexpr (debug_mode) {
 | 
			
		||||
    for (int i = 0; i < argc; ++i)
 | 
			
		||||
      printf("argv[%d] = %s\n", i, argv[i]);
 | 
			
		||||
  }
 | 
			
		||||
 | 
			
		||||
  std::string input_path{};
 | 
			
		||||
  std::string output_path{};
 | 
			
		||||
  bool compressing = true;
 | 
			
		||||
 | 
			
		||||
  while (1) {
 | 
			
		||||
  while (true) {
 | 
			
		||||
    int option_index = 0;
 | 
			
		||||
    static struct option long_options[] = {
 | 
			
		||||
        {"help", no_argument, nullptr, 'h'},
 | 
			
		||||
@ -65,67 +72,68 @@ int main(int argc, char *argv[]) {
 | 
			
		||||
        {"output", required_argument, nullptr, 'o'},
 | 
			
		||||
        {"compress", no_argument, nullptr, 'c'},
 | 
			
		||||
        {"uncompress", no_argument, nullptr, 'u'},
 | 
			
		||||
        {0, 0, 0, 0}};
 | 
			
		||||
        {nullptr, 0, nullptr, 0}};
 | 
			
		||||
    int c = getopt_long(argc, argv, "hi:o:cu", long_options, &option_index);
 | 
			
		||||
    if (c == -1)
 | 
			
		||||
      break;
 | 
			
		||||
    switch (c) {
 | 
			
		||||
    case 0: {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("\noption %s", long_options[option_index].name);
 | 
			
		||||
      if (optarg) {
 | 
			
		||||
        printf(" with arg %s\n", optarg);
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("\noption %s", long_options[option_index].name);
 | 
			
		||||
        if (optarg) {
 | 
			
		||||
          printf(" with arg %s\n", optarg);
 | 
			
		||||
        }
 | 
			
		||||
      }
 | 
			
		||||
#endif
 | 
			
		||||
      break;
 | 
			
		||||
    }
 | 
			
		||||
    case 'h': {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("From main - option --help passed\n");
 | 
			
		||||
#endif
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("From main - option --help passed\n");
 | 
			
		||||
      }
 | 
			
		||||
      help();
 | 
			
		||||
      return 0;
 | 
			
		||||
    }
 | 
			
		||||
    case 'i': {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("From main - option --input with value '%s'\n", optarg);
 | 
			
		||||
#endif
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("From main - option --input with value '%s'\n", optarg);
 | 
			
		||||
      }
 | 
			
		||||
      input_path = optarg;
 | 
			
		||||
      break;
 | 
			
		||||
    }
 | 
			
		||||
    case 'o': {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("From main - option --output with value '%s'\n", optarg);
 | 
			
		||||
#endif
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("From main - option --output with value '%s'\n", optarg);
 | 
			
		||||
      }
 | 
			
		||||
      output_path = optarg;
 | 
			
		||||
      break;
 | 
			
		||||
    }
 | 
			
		||||
    case 'c': {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("From main - option --compress\n");
 | 
			
		||||
#endif
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("From main - option --compress\n");
 | 
			
		||||
      }
 | 
			
		||||
      compressing = true;
 | 
			
		||||
      break;
 | 
			
		||||
    }
 | 
			
		||||
    case 'u': {
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("From main - option --uncompress\n");
 | 
			
		||||
#endif
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("From main - option --uncompress\n");
 | 
			
		||||
      }
 | 
			
		||||
      compressing = false;
 | 
			
		||||
      break;
 | 
			
		||||
    }
 | 
			
		||||
    case '?': {
 | 
			
		||||
    case '?':
 | 
			
		||||
    default: {
 | 
			
		||||
      puts("Error: unknown parameter.");
 | 
			
		||||
#ifdef Debug
 | 
			
		||||
      printf("From main - option -?\n");
 | 
			
		||||
#endif
 | 
			
		||||
      if constexpr (debug_mode) {
 | 
			
		||||
        printf("From main - option -?\n");
 | 
			
		||||
      }
 | 
			
		||||
      help();
 | 
			
		||||
      return 1;
 | 
			
		||||
    }
 | 
			
		||||
    }
 | 
			
		||||
  }
 | 
			
		||||
 | 
			
		||||
  if (input_path == "") {
 | 
			
		||||
  if (input_path.empty()) {
 | 
			
		||||
    puts("Error: no input file specified");
 | 
			
		||||
    return 2;
 | 
			
		||||
  }
 | 
			
		||||
@ -140,7 +148,15 @@ int main(int argc, char *argv[]) {
 | 
			
		||||
      - bit-packing, limiter la taille du dictionnaire pour un certain nombre de
 | 
			
		||||
        bits.
 | 
			
		||||
     */
 | 
			
		||||
    compress(input_path, output_path.c_str());
 | 
			
		||||
    if constexpr (debug_mode) {
 | 
			
		||||
      puts("Beginning compression");
 | 
			
		||||
    }
 | 
			
		||||
    if(output_path.empty()) {
 | 
			
		||||
      compress(input_path, nullptr);
 | 
			
		||||
    } else {
 | 
			
		||||
      compress(input_path, output_path.c_str());
 | 
			
		||||
    }
 | 
			
		||||
    // compress(input_path, output_path.c_str());
 | 
			
		||||
  } else {
 | 
			
		||||
    puts("Not yet implemented :(");
 | 
			
		||||
    /*
 | 
			
		||||
 | 
			
		||||
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		Reference in New Issue
	
	Block a user