.bettercodehub.yml

@@ -0,0 +1,6 @@
+component_depth: 2
+languages:
+    - cpp
+exclude:
+    - includes/*
+    - .*/*

.circleci/config.yml

@@ -5,4 +5,4 @@ jobs:
       - image: purplekarrot/gcc-8
     steps:
       - checkout
-      - run: cd build && cmake -DCMAKE_BUILD_TYPE=Release .. && make -j
+      - run: cd build && cmake -DCMAKE_BUILD_TYPE=Debug .. && make -j

.gitignore

@@ -1,13 +1,9 @@
 *~
 
 gmon\.out
+/cmake-build-debug/Makefile
 
+cmake-build-debug/
+
+\.idea/
 *.lzw
-
-\.scannerwork/
-
-bw-output/
-
-bin/
-build/
-debug/

.gitlab-ci.yml

@@ -1,7 +0,0 @@
-image: rikorose/gcc-cmake:latest
-stages:
-  - build
-build:
-  stage: build
-  script:
-    - mkdir -p build bin && cd build && cmake -DCMAKE_BUILD_TYPE=Release .. && make -j

.travis.yml

@@ -4,48 +4,60 @@ compiler: clang
 os: linux
 dist: trusty
 addons:
-    sonarcloud:
-        organization: "phundrak-github"
-        token:
-            secure: ${SONAR_TOKEN}
     apt:
-        config:
-            retries: true
         sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-trusty-5.0
         packages:
             - g++-7
             - clang-5.0
-cache:
-    apt: true
+
 matrix:
   include:
     # Linux Clang C++17
     - env:
-        BUILD_TYPE=debug
+        BUILD_TYPE=Debug
         BIN_DIR=debug
         CC=clang-5.0
         CXX=clang++-5.0
     - env:
-        BUILD_TYPE=release
+        BUILD_TYPE=Release
         BIN_DIR=bin
         CC=clang-5.0
         CXX=clang++-5.0
 
     # Linux GCC C++17
     - env:
-        - MATRIX_EVAL="BUILD_TYPE=debug && BIN_DIR=debug && CC=gcc-7 && CXX=g++-7"
+        - MATRIX_EVAL="BUILD_TYPE=Debug && BIN_DIR=debug && CC=gcc-7 && CXX=g++-7"
       compiler: gcc
       before_install:
         - eval "${MATRIX_EVAL}"
     - env:
-        - MATRIX_EVAL="BUILD_TYPE=release && BIN_DIR=bin && CC=gcc-7 && CXX=g++-7"
+        - MATRIX_EVAL="BUILD_TYPE=Release && BIN_DIR=bin && CC=gcc-7 && CXX=g++-7"
       compiler: gcc
       before_install:
         - eval "${MATRIX_EVAL}"
 
+    # OSX Clang
+    - os: osx
+      osx_image: xcode9.3
+      env:
+        BUILD_TYPE=Release
+        BIN_DIR=bin
+      before_install:
+        brew update
+      install:
+        brew upgrade cmake
+    - os: osx
+      osx_image: xcode9.3
+      env:
+        BUILD_TYPE=Debug
+        BIN_DIR=debug
+      before_install:
+        brew update
+      install:
+        brew upgrade cmake
 script:
-    - make $BUILD_TYPE
-    - build-wrapper-linux-x86-64 --out-dir bw-output make clean all
-    - sonar-scanner -Dsonar.projectKey=Phundrak_lzw-assignment -Dsonar.sources=./src/ -Dsonar.cfamily.build-wrapper-output=bw-output -Dsonar.host.url=https://sonarcloud.io
+    - cd build
+    - cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..
+    - make -j

CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
 set(CMAKE_LEGACY_CYGWIN_WIN32 0)
+set(CMAKE_BUILD_TYPE Debug)
 
 project("projet_lzw")
 
@@ -25,6 +26,8 @@ else()
         message( FATAL_ERROR "C++17 not supported, CMake will exit." )
     endif()
 endif()
+
+# set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED YES)
 set(CMAKE_CXX_EXTENSIONS OFF)
 

Makefile

@@ -1,16 +0,0 @@
-all:
-	@mkdir -p build
-	@cd build && pwd && cmake -DCMAKE_BUILD_TYPE=Release .. && make
-	@strip bin/project_lzw
-
-release:
-	@mkdir -p build
-	@cd build && pwd && cmake -DCMAKE_BUILD_TYPE=Release .. && make
-	@strip bin/projet_lzw
-
-debug:
-	@mkdir -p build
-	@cd build && pwd && cmake -DCMAKE_BUILD_TYPE=Debug .. && make
-
-clean:
-	rm -rf bin/* build/* debug/*

README.md

@@ -1,25 +1,11 @@
-[![CircleCI](https://circleci.com/gh/Phundrak/lzw-assignment/tree/master.svg?style=svg)](https://circleci.com/gh/Phundrak/lzw-assignment/tree/master)
 [![Travis Badge](https://travis-ci.org/Phundrak/lzw-assignment.svg?branch=master)](https://travis-ci.org/Phundrak/lzw-assignment)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/80cf9a0514554f368effaf78d8e4ae15)](https://www.codacy.com/app/Phundrak/lzw-assignment?utm_source=github.com&utm_medium=referral&utm_content=Phundrak/lzw-assignment&utm_campaign=Badge_Grade)
 [![CodeFactor](https://www.codefactor.io/repository/github/phundrak/lzw-assignment/badge)](https://www.codefactor.io/repository/github/phundrak/lzw-assignment)
-[![SonarCloud Badge](https://sonarcloud.io/api/project_badges/measure?project=Phundrak_lzw-assignment&metric=alert_status)](https://sonarcloud.io/dashboard?id=Phundrak_lzw-assignment)
 [![Spacemacs Badge](https://cdn.rawgit.com/syl20bnr/spacemacs/442d025779da2f62fc86c2082703697714db6514/assets/spacemacs-badge.svg)](http://spacemacs.org)
+[![BCH compliance](https://bettercodehub.com/edge/badge/Phundrak/lzw-assignment?branch=master)](https://bettercodehub.com/)
 
 # LZW Compressing tool
 
 This is a university assignment for which I aim to create an LZW algorithm implementation to create a small tool similar to `gzip` and `gunzip` that can compress and uncompress files in a lossless fashion.
 
 This project is written is C++17, compiled with clang under a UNIX environment. Other compilers and environments will not be tested.
-
-## How to use it
-
-Currently, five different options are available to the user:
-- `-h` or `--help` will show how to use `projet_lzw`
-- `-c` or `--compress` tells `projet_lzw` to compress the input file
-- `-u` or `--uncompress` tells `projet_lzw` to uncompress the input file
-- `-i <file>` or `--input <file path>` specifies the input file to be compressed or uncompressed (**MANDATORY**)
-- `-o <file>` or `--output <file path>` specifies the name of the output file. If not used, the default output name for compression is `output.lzw`, and the default name for uncompressing is `<filename>_uncompressed`.
-
-By default, `projet_lzw` will uncompress the (mandatory) input file.
-
-It is planned to add in the future a sixth option, `-p` or `--passes` that will allow to compress multiple times the input file.

bin/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

build/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

debug/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

doc/.gitignore

@@ -0,0 +1,3 @@
+*
+!.gitignore
+!Doxyfile

includes/getopt.c

@@ -0,0 +1,244 @@
+/*
+  Copyright 2005-2014 Rich Felker, et al.
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include "getopt.h"
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+char *optarg;
+int optind = 1, opterr = 1, optopt, __optpos, optreset = 0;
+
+#define optpos __optpos
+
+static void __getopt_msg(const char *a, const char *b, const char *c,
+                         size_t l) {
+  FILE *f = stderr;
+  flockfile(f);
+  fputs(a, f) >= 0 && fwrite(b, strlen(b), 1, f) &&
+      fwrite(c, 1, l, f) == l &&putc('\n', f);
+  funlockfile(f);
+}
+
+int getopt(int argc, char *const argv[], const char *optstring) {
+  int i, c, d;
+  int k, l;
+  char *optchar;
+
+  if (!optind || optreset) {
+    optreset = 0;
+    __optpos = 0;
+    optind = 1;
+  }
+
+  if (optind >= argc || !argv[optind])
+    return -1;
+
+  if (argv[optind][0] != '-') {
+    if (optstring[0] == '-') {
+      optarg = argv[optind++];
+      return 1;
+    }
+    return -1;
+  }
+
+  if (!argv[optind][1])
+    return -1;
+
+  if (argv[optind][1] == '-' && !argv[optind][2])
+    return optind++, -1;
+
+  if (!optpos)
+    optpos++;
+  c = argv[optind][optpos], k = 1;
+  optchar = argv[optind] + optpos;
+  optopt = c;
+  optpos += k;
+
+  if (!argv[optind][optpos]) {
+    optind++;
+    optpos = 0;
+  }
+
+  if (optstring[0] == '-' || optstring[0] == '+')
+    optstring++;
+
+  i = 0;
+  d = 0;
+  do {
+    d = optstring[i], l = 1;
+    if (l > 0)
+      i += l;
+    else
+      i++;
+  } while (l && d != c);
+
+  if (d != c) {
+    if (optstring[0] != ':' && opterr)
+      __getopt_msg(argv[0], ": unrecognized option: ", optchar, k);
+    return '?';
+  }
+  if (optstring[i] == ':') {
+    if (optstring[i + 1] == ':')
+      optarg = 0;
+    else if (optind >= argc) {
+      if (optstring[0] == ':')
+        return ':';
+      if (opterr)
+        __getopt_msg(argv[0], ": option requires an argument: ", optchar, k);
+      return '?';
+    }
+    if (optstring[i + 1] != ':' || optpos) {
+      optarg = argv[optind++] + optpos;
+      optpos = 0;
+    }
+  }
+  return c;
+}
+
+static void permute(char *const *argv, int dest, int src) {
+  char **av = (char **)argv;
+  char *tmp = av[src];
+  int i;
+  for (i = src; i > dest; i--)
+    av[i] = av[i - 1];
+  av[dest] = tmp;
+}
+
+static int __getopt_long_core(int argc, char *const *argv,
+                              const char *optstring,
+                              const struct option *longopts, int *idx,
+                              int longonly) {
+  optarg = 0;
+  if (longopts && argv[optind][0] == '-' &&
+      ((longonly && argv[optind][1] && argv[optind][1] != '-') ||
+       (argv[optind][1] == '-' && argv[optind][2]))) {
+    int colon = optstring[optstring[0] == '+' || optstring[0] == '-'] == ':';
+    int i, cnt, match;
+    char *opt;
+    for (cnt = i = 0; longopts[i].name; i++) {
+      const char *name = longopts[i].name;
+      opt = argv[optind] + 1;
+      if (*opt == '-')
+        opt++;
+      for (; *name && *name == *opt; name++, opt++)
+        ;
+      if (*opt && *opt != '=')
+        continue;
+      match = i;
+      if (!*name) {
+        cnt = 1;
+        break;
+      }
+      cnt++;
+    }
+    if (cnt == 1) {
+      i = match;
+      optind++;
+      optopt = longopts[i].val;
+      if (*opt == '=') {
+        if (!longopts[i].has_arg) {
+          if (colon || !opterr)
+            return '?';
+          __getopt_msg(argv[0],
+                       ": option does not take an argument: ", longopts[i].name,
+                       strlen(longopts[i].name));
+          return '?';
+        }
+        optarg = opt + 1;
+      } else if (longopts[i].has_arg == required_argument) {
+        if (!(optarg = argv[optind])) {
+          if (colon)
+            return ':';
+          if (!opterr)
+            return '?';
+          __getopt_msg(argv[0],
+                       ": option requires an argument: ", longopts[i].name,
+                       strlen(longopts[i].name));
+          return '?';
+        }
+        optind++;
+      }
+      if (idx)
+        *idx = i;
+      if (longopts[i].flag) {
+        *longopts[i].flag = longopts[i].val;
+        return 0;
+      }
+      return longopts[i].val;
+    }
+    if (argv[optind][1] == '-') {
+      if (!colon && opterr)
+        __getopt_msg(argv[0],
+                     cnt ? ": option is ambiguous: "
+                         : ": unrecognized option: ",
+                     argv[optind] + 2, strlen(argv[optind] + 2));
+      optind++;
+      return '?';
+    }
+  }
+  return getopt(argc, argv, optstring);
+}
+
+static int __getopt_long(int argc, char *const *argv, const char *optstring,
+                         const struct option *longopts, int *idx,
+                         int longonly) {
+  int ret, skipped, resumed;
+  if (!optind || optreset) {
+    optreset = 0;
+    __optpos = 0;
+    optind = 1;
+  }
+  if (optind >= argc || !argv[optind])
+    return -1;
+  skipped = optind;
+  if (optstring[0] != '+' && optstring[0] != '-') {
+    int i;
+    for (i = optind;; i++) {
+      if (i >= argc || !argv[i])
+        return -1;
+      if (argv[i][0] == '-' && argv[i][1])
+        break;
+    }
+    optind = i;
+  }
+  resumed = optind;
+  ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
+  if (resumed > skipped) {
+    int i, cnt = optind - resumed;
+    for (i = 0; i < cnt; i++)
+      permute(argv, skipped, optind - 1);
+    optind = skipped + cnt;
+  }
+  return ret;
+}
+
+int getopt_long(int argc, char *const *argv, const char *optstring,
+                const struct option *longopts, int *idx) {
+  return __getopt_long(argc, argv, optstring, longopts, idx, 0);
+}
+
+int getopt_long_only(int argc, char *const *argv, const char *optstring,
+                     const struct option *longopts, int *idx) {
+  return __getopt_long(argc, argv, optstring, longopts, idx, 1);
+}

includes/getopt.h

@@ -0,0 +1,54 @@
+/*
+  Copyright 2005-2014 Rich Felker, et al.
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef _GETOPT_H
+#define _GETOPT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int getopt(int, char *const[], const char *);
+extern char *optarg;
+extern int optind, opterr, optopt, optreset;
+
+struct option {
+  const char *name;
+  int has_arg;
+  int *flag;
+  int val;
+};
+
+int getopt_long(int, char *const *, const char *, const struct option *, int *);
+int getopt_long_only(int, char *const *, const char *, const struct option *,
+                     int *);
+
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/bitpack.cc

@@ -1,177 +0,0 @@
-#include "bitpack.hh"
-#include "common.hh"
-#include <algorithm>
-#include <cmath>
-
-using std::uint16_t;
-using std::vector;
-using uchar = unsigned char;
-using vuint16 = vector<uint16_t>;
-using vuchar = vector<uchar>;
-using ustring = std::basic_string<unsigned char>;
-
-[[nodiscard]] int max(const int t_n) { return ipow(2, t_n) - 1; }
-
-[[nodiscard]] constexpr uint16_t mask_n(int t_nb_bits) {
-  if (t_nb_bits == 0) {
-    return 0;
-  }
-  uint16_t mask = mask_n(t_nb_bits - 1);
-  mask = static_cast<uint16_t>(mask << 1);
-  mask |= 0x1;
-  return mask;
-}
-
-constexpr uint16_t masks[17] = {
-    mask_n(0),  mask_n(1),  mask_n(2),  mask_n(3),  mask_n(4),  mask_n(5),
-    mask_n(6),  mask_n(7),  mask_n(8),  mask_n(9),  mask_n(10), mask_n(11),
-    mask_n(12), mask_n(13), mask_n(14), mask_n(15), mask_n(16)};
-
-///////////////////////////////////////////////////////////////////////////////
-//                                  packing                                  //
-///////////////////////////////////////////////////////////////////////////////
-
-[[nodiscard]] vuchar pack(const vuint16 &t_input) {
-  vuchar vec{};
-  return pack_n(t_input.begin(), t_input.end(), vec, 9);
-}
-
-[[nodiscard]] vuchar pack_n(const vuint16::const_iterator t_input_begin,
-                            const vuint16::const_iterator t_input_end,
-                            vuchar &t_res, int t_n) {
-  if (t_n == 16) {
-    return pack_16(t_input_begin, t_input_end, t_res);
-  }
-  const int max_value = max(t_n); // max value held within t_n bits
-
-  int step = t_n % 8;
-  int left_shift = 0;
-  int right_shift = 0;
-  uchar current_char = 0;
-  bool char_touched = false;
-
-  // pour chaque élément
-  for (auto it = t_input_begin; it != t_input_end; ++it) {
-    // si on a atteint ou dépassé la valeur maximale, on change de nombre de
-    // bits
-    if (*it >= max_value) {
-      // écriture du masque pour notifier à la décompression du changement de
-      // bits
-      if ((left_shift += step) >= t_n) {
-        left_shift = (left_shift - t_n) + step;
-      }
-      const auto mask = masks[t_n] >> left_shift;
-      t_res.push_back(static_cast<uchar>(current_char | mask));
-      bool zero_rs = (right_shift == 0);
-
-      right_shift -= step;
-      if (right_shift < 0 && !zero_rs) {
-        // si right_shift est inférieur à zéro
-        // si right_shift était différent de zéro, alors extra octet
-        current_char = static_cast<uchar>(masks[t_n] >> (-right_shift) & 0xFFU);
-        t_res.push_back(current_char);
-      }
-      t_res.push_back(static_cast<uchar>(masks[t_n]));
-      return pack_n(it, t_input_end, t_res, t_n + 1);
-    }
-
-    // écriture normale
-    if ((left_shift += step) >= t_n) {
-      left_shift = (left_shift - t_n) + step;
-    }
-    t_res.push_back(
-        static_cast<uchar>(current_char | (*it >> left_shift & 0xFFU)));
-
-    bool zero_rs = (right_shift == 0);
-    right_shift -= step;
-    if (right_shift < 0) {
-      if (!zero_rs) {
-        current_char = static_cast<uchar>(*it >> (-right_shift) & 0xFFU);
-        t_res.push_back(current_char);
-      }
-      right_shift = 8 + right_shift;
-    }
-    if (right_shift == 0) {
-      current_char = static_cast<uchar>(*it & 0xFFU);
-      t_res.push_back(current_char);
-      current_char = 0;
-      char_touched = false;
-    } else {
-      current_char = static_cast<uchar>(*it << right_shift & 0xFFU);
-      char_touched = true;
-    }
-  }
-  if (char_touched) {
-    t_res.push_back(current_char);
-  }
-  return t_res;
-}
-
-[[nodiscard]] vuchar pack_16(const vuint16::const_iterator t_input_begin,
-                             const vuint16::const_iterator t_input_end,
-                             vuchar &t_res) {
-  std::for_each(t_input_begin, t_input_end, [&t_res](const auto value) {
-    t_res.push_back(static_cast<uchar>(value >> 8 & 0xFFU));
-    t_res.push_back(static_cast<uchar>(value & 0xFFU));
-  });
-  return t_res;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-//                                 unpacking                                 //
-///////////////////////////////////////////////////////////////////////////////
-
-[[nodiscard]] vuint16 unpack(ustring &&t_input) {
-  vuint16 vec{};
-  return unpack_n(t_input.begin(), t_input.end(), vec, 9);
-}
-
-[[nodiscard]] vuint16 unpack_n(const ustring::const_iterator t_begin,
-                               const ustring::const_iterator t_end,
-                               vuint16 &t_res, int t_n) {
-  if (t_n == 16) {
-    return unpack_16(t_begin, t_end, t_res);
-  }
-  int step = t_n % 8;
-  int left_shift = 0;
-  int right_shift = 0;
-  const int max_value = max(t_n);
-  for (auto it = t_begin; it < t_end - 1; /* nope */) {
-    uint16_t current_char = 0;
-    // left bits
-    if ((left_shift += step) >= t_n) {
-      left_shift = (left_shift - t_n) + step;
-    }
-    current_char = static_cast<uint16_t>(*it << left_shift) & masks[t_n];
-    // right bits
-    bool zero_rs = (right_shift == 0);
-    right_shift -= step;
-    if (right_shift < 0) {
-      // if previous right shift was negative and not zero
-      if (!zero_rs) {
-        current_char |= *++it << (-right_shift) & masks[16 + right_shift];
-      }
-      right_shift = 8 + right_shift;
-    }
-    current_char |= *++it >> right_shift & masks[8 - right_shift];
-    // char made!
-    if (current_char >= max_value) { // if it is the mask
-      return unpack_n(it + 1, t_end, t_res, t_n + 1);
-    }
-    current_char &= masks[t_n];
-    t_res.push_back(current_char);
-    if (right_shift == 0) {
-      ++it;
-    }
-  }
-  return t_res;
-}
-
-[[nodiscard]] vuint16 unpack_16(const ustring::const_iterator t_begin,
-                                const ustring::const_iterator t_end,
-                                vuint16 &t_res) {
-  for (auto it = t_begin; it < t_end; ++it) {
-    t_res.push_back(static_cast<uint16_t>(*it << 8 | *++it));
-  }
-  return t_res;
-}

src/bitpack.hh

@@ -1,34 +0,0 @@
-#ifndef LZW_SRC_BITPACK_H_
-#define LZW_SRC_BITPACK_H_
-
-#include <cstdint>
-#include <string>
-#include <vector>
-
-[[nodiscard]] std::vector<unsigned char>
-pack(const std::vector<std::uint16_t> &);
-
-[[nodiscard]] std::vector<unsigned char>
-pack_n(std::vector<std::uint16_t>::const_iterator,
-       std::vector<std::uint16_t>::const_iterator, std::vector<unsigned char> &,
-       int);
-
-[[nodiscard]] std::vector<unsigned char>
-pack_16(std::vector<std::uint16_t>::const_iterator,
-        std::vector<std::uint16_t>::const_iterator,
-        std::vector<unsigned char> &);
-
-[[nodiscard]] std::vector<std::uint16_t>
-unpack(std::basic_string<unsigned char> &&);
-
-[[nodiscard]] std::vector<std::uint16_t>
-unpack_n(std::basic_string<unsigned char>::const_iterator t_begin,
-         std::basic_string<unsigned char>::const_iterator t_end,
-         std::vector<std::uint16_t> &, int t_n);
-
-[[nodiscard]] std::vector<std::uint16_t>
-unpack_16(std::basic_string<unsigned char>::const_iterator,
-          std::basic_string<unsigned char>::const_iterator,
-          std::vector<std::uint16_t> &);
-
-#endif /* LZW_SRC_BITPACK_H_ */

src/common.cc

@@ -1,69 +1,44 @@
+/**
+ *   \file common.cc
+ *   \brief Implementation for functions in common
+ */
+
 #include "common.hh"
 
-using std::uint16_t;
-using std::uint8_t;
-using dic_comp_t = std::map<std::pair<uint16_t, uint8_t>, uint16_t>;
-using ustring = std::basic_string<unsigned char>;
-using p_ustring = std::shared_ptr<ustring>;
+using uint8_t = std::uint8_t;
+using uint32_t = std::uint32_t;
+using dic_t = std::map<std::pair<uint32_t, uint8_t>, uint32_t>;
 
-[[nodiscard]] int ipow(int base, int exp) {
-  int result = 1;
-  for (;;) {
-    if (exp & 1) {
-      result *= base;
-    }
-    exp >>= 1;
-    if (exp == 0) {
-      break;
-    }
-    base *= base;
-  }
-  return result;
-}
-
-[[nodiscard]] std::pair<bool, uint16_t>
-dico(dic_comp_t &t_dictionary, const uint16_t t_nr_chaine, const uint8_t t_c) {
+/**
+ *  Cette fonction a pour double usage la recherche d’une chaine de caractères
+ *  dans le dictionnaire, ou bien l’ajout d’une nouvelle chaîne si celle-ci n’est
+ *  pas déjà présente. Une chaine de caractères est représentée par un couple
+ *  numéro de chaine / caractère, le numéro de chaine renvoyant au caractère
+ *  précédent (soit son code ASCII, soit son indice dans le dictionnaire) et le
+ *  caractère se référant au dernier caractère de la chaine courante. Si le
+ *  numéro de chaine est -1, alors il s’agit du premier caractère de la chaine,
+ *  et la valeur renvoyée sera la valeur ASCII du caractère. La fonction renvoie
+ *  une paire bool/uint32_t, la valeur booléene indiquant si une nouvelle fut
+ *  ajoutée dans le dictionnaire ou non, et le uint32_t indiquant la valeur
+ *  numérique de la chaîne dans le dictionnaire.
+ *
+ *  \param t_dictionary Dictionnaire
+ *  \param t_nr_chaine Numéro de la chaine précédant le caractères \p t_c dans \p t_dictionary
+ *  \param t_c Caractère suivant la chaine de caractères \p t_nr_chaine
+ *  \return const std::pair<bool, uint32_t>
+ */
+const std::pair<bool, uint32_t>
+dico(std::map<std::pair<uint32_t, uint8_t>, uint32_t> &t_dictionary,
+     uint32_t t_nr_chaine, uint8_t t_c) {
   if (t_nr_chaine == 0xFFFF) {
     return std::make_pair(true, t_c);
   }
   auto &e = t_dictionary[std::make_pair(t_nr_chaine, t_c)];
-  if (e != 0)
-    return std::make_pair(true, e);
-  e = static_cast<uint16_t>(t_dictionary.size() + 255);
-  return std::make_pair(false, e);
-}
-
-[[nodiscard]] ustring dico_uncompress(std::map<uint16_t, ustring> &t_dict,
-                                      const uint16_t t_code,
-                                      const uint16_t t_old) {
-  // le code existe dans le dictionnaire s’il est < 256
-  if (t_code < 256) {
-    ustring e{static_cast<unsigned char>(t_code)};
-    // 256 car on n'a pas encore tenté d'insérer de nouveau caractère
-    if (t_old < 256) {
-      t_dict[static_cast<uint16_t>(t_dict.size() + 256)] =
-          static_cast<unsigned char>(t_old) + e;
-    } else {
-      t_dict[static_cast<uint16_t>(t_dict.size() + 256)] = t_dict[t_old] + e;
-    }
-    return e;
-  }
-
-  auto &e = t_dict[t_code];
-  auto str = (t_old < 256) ? ustring{static_cast<unsigned char>(t_old)}
-                           : t_dict[t_old];
-
-  // le code existe dans le dictionnaire
-  if (!e.empty()) {
-    str += e[0];
-    const auto index = static_cast<uint16_t>(t_dict.size() + 256);
-    t_dict[index] = str;
-    return e;
-  }
-
-  // le code n'existe pas encore dans le dictionnaire
-  str += str[0];
-  e = str;
-  t_dict[t_code] = e;
-  return e;
+  return (e != 0) ? std::make_pair(true, e)
+             : std::make_pair(
+                   false,
+                   (e = static_cast<
+                            typename std::remove_reference<decltype(e)>::type>(
+                            t_dictionary.size()) +
+                        255));
 }

src/common.hh

@@ -1,18 +1,17 @@
+/**
+ *   \file common.hh
+ *   \brief Header for functions in common
+ */
+
 #ifndef LZW_SRC_COMMON_H_
 #define LZW_SRC_COMMON_H_
 
 #include <cstdint>
 #include <map>
-#include <memory>
 
-[[nodiscard]] int ipow(int, int);
-
-[[nodiscard]] std::pair<bool, std::uint16_t>
-dico(std::map<std::pair<std::uint16_t, std::uint8_t>, std::uint16_t> &,
-     const std::uint16_t, const std::uint8_t);
-
-[[nodiscard]] std::basic_string<unsigned char>
-dico_uncompress(std::map<std::uint16_t, std::basic_string<unsigned char>> &,
-                const std::uint16_t, const std::uint16_t);
+/// \brief Recherche ou ajout de chaine dans le dictionnaire
+const std::pair<bool, std::uint32_t>
+dico(std::map<std::pair<std::uint32_t, std::uint8_t>, std::uint32_t> &,
+     uint32_t, uint8_t);
 
 #endif /* LZW_SRC_COMMON_H_ */

src/compress.cc

@@ -1,77 +1,149 @@
+/**
+ *   \file compress.cc
+ *   \brief Implementation of compression
+ */
+
 #include "compress.hh"
-#include "common.hh"
-#include "io.hh"
+#include "utf8.hh"
 #include <cassert>
 #include <cstdlib>
 #include <fstream>
-#include <iterator>
-using std::ios;
-using std::string;
-using std::uint16_t;
-using std::uint8_t;
-using std::vector;
-using vuint16 = vector<uint16_t>;
-using vvuint16 = vector<vuint16>;
-using ustring = std::basic_string<unsigned char>;
+#include <iostream>
+#include "io.hh"
 
-using dict_t = std::map<std::pair<uint16_t, uint8_t>, uint16_t>;
+using dict_t = std::map<std::pair<uint32_t, uint8_t>, uint32_t>;
+using ustring = std::basic_string<uint8_t>; // chaîne non encodée
+using uvec = std::vector<std::uint32_t>;         // chaîne encodée
 using std::printf;
 
-[[nodiscard]] ustring read_file(const string &filename) {
-  std::ifstream file{filename, ios::binary};
-  assert(file);
-  file.unsetf(ios::skipws);
-  file.seekg(0, ios::end);
-  const auto file_size = file.tellg();
-  file.seekg(0, ios::beg);
-  ustring res{};
-  res.reserve(file_size);
-  res.insert(res.begin(), std::istream_iterator<unsigned char>(file),
-             std::istream_iterator<unsigned char>());
-  file.close();
-  return res;
+constexpr size_t CHUNK_SIZE = 32768;
+
+/**
+ *
+ *  Reçoit une liste de paires std::thread/vecteurs, le premier étant le
+ *  processus dont sa sortie est stockée dans le second. La sortie, une liste
+ *  de caractères uint32_t, est écrite dans le fichier de sortie \p out.
+ *
+ *  \param[in] t_threads
+ *  \param[out] t_out
+ */
+void join_and_write(
+    std::vector<std::pair<std::unique_ptr<std::thread>, uvec>> &t_threads,
+    std::vector<std::vector<std::uint32_t>> &compressed_text) {
+  for (auto &elem : t_threads) {
+    (*elem.first).join();
+  }
+  for (auto &elem : t_threads) {
+    compressed_text.push_back(std::move(elem.second));
+  }
+  t_threads.clear();
 }
 
-[[nodiscard]] vvuint16 lzw_compress(ustring &&t_text) {
-  vvuint16 res{};
-  const auto DICT_MAX = static_cast<size_t>(ipow(2, 14) - 256); /* 16 bits */
-  uint16_t w = 0xFFFF;
-  vuint16 chunk{};
-  dict_t dict{};
-  for (const auto c : t_text) {
-    if (dict.size() >= DICT_MAX) {
-      if (w != 0xFFFF) {
-        chunk.push_back(w);
-      }
-      res.push_back(chunk);
-      w = 0xFFFF;
-      chunk.clear();
-      dict.clear();
-    }
-    if (const auto &[exists, pos] = dico(dict, w, static_cast<uint8_t>(c));
+/**
+ *  La chaîne de caractère \p t_text est lue caractère par caractère, et est et
+ *  selon la valeur de retour de la fonction \ref dico (permettant dans le même
+ *  temps la création du dictionnaire), on rajoute un mot ou pas dans le vecteur
+ *  de caractères UTF-8 représentant des mots de chars compressés. La fonction
+ *  renvoie ledit vecteur de uint32_t via le paramètre \p t_res.
+ *
+ *  \param[in] t_text Chaîne de caractères uint8_t représentant le fichier d'entrée
+ *  \param[out] t_res Chaîne de caractères de sortie
+ */
+void lzw_compress(const std::vector<char> &t_text, uvec &t_res) {
+  dict_t dictionary{};
+  std::puts("Compressing...");
+  uint32_t w = 0xFFFF;
+
+  constexpr size_t DICT_MAX = 7936; /* 12 bits */
+
+  for (const auto &c : t_text) {
+    if (dictionary.size() >= DICT_MAX) {
+      t_res.push_back(static_cast<uint32_t>(w));
+      w = static_cast<uint32_t>(c);
+    } else if (const auto &[exists, pos] =
+                   dico(dictionary, w, static_cast<std::uint8_t>(c));
                exists) {
       w = pos;
     } else {
-      chunk.push_back(w);
-      w = static_cast<uint16_t>(c);
+      t_res.push_back(static_cast<uint32_t>(w));
+      w = static_cast<std::uint8_t>(c);
     }
   }
-  if (w != 0xFFFF) {
-    chunk.push_back(w);
-    res.push_back(std::move(chunk));
-  }
-  return res;
 }
 
+/**
+ *  Wrapper de la fonction \ref lzw_compress gérant l'ouverture, la lecture,
+ *  l'écriture et la fermeture des fichiers d’entrée et de sortie. Si \p
+ *  t_out_file est nul (chemin non spécifié), il prendra alors la valeur de
+ *  \p t_in_file à laquelle sera annexé l’extension `.lzw`.
+ *
+ *  \param[in] t_in_file Chemin vers le fichier d’entrée
+ *  \param[in] t_out_file Chemin vers le fichier de sortie
+ */
 void compress(const std::string &t_in_file, const char *t_out_file) {
-  std::ofstream out{(t_out_file != nullptr) ? t_out_file : "output.lzw",
-                    ios::out | ios::binary};
-  if (!out.is_open()) {
-    std::cerr << "Error at " << __FILE__ << ":" << __LINE__ - 4
-              << ": could not open output file. Aborting...\n";
+  // Fichier d’entrée
+  std::ifstream input_file{t_in_file};
+  if (!input_file.is_open()) {
+    std::cerr << "Error at " << __FILE__ << ":" << __LINE__ - 2
+              << ": could not open output file \"" << t_in_file
+              << "\". Aborting...\n";
     exit(1);
   }
-  const auto compressed_text(lzw_compress(read_file(t_in_file)));
+
+  // Fichier de sortie
+  FILE *out =
+      (t_out_file != nullptr) ? fopen(t_out_file, "wb") : fopen("output.lzw", "wb");
+  if (out == nullptr) {
+    std::cerr << "Error at " << __FILE__ << ":" << __LINE__ - 4
+              << ": could not open output file. Aborting...\n";
+    input_file.close();
+    exit(1);
+  }
+
+  // collection of chunks
+  std::vector<std::vector<std::uint32_t>> compressed_text{};
+
+  // thread pool
+  std::vector<std::pair<std::unique_ptr<std::thread>, uvec>> threads{};
+
+  // chunk chars
+  std::vector<char> chunk(CHUNK_SIZE, 0);
+  while (input_file.read(chunk.data(),
+                         static_cast<std::streamsize>(chunk.size()))) {
+    threads.emplace_back(nullptr, uvec{});
+    threads.back().second.reserve(CHUNK_SIZE);
+    threads.back().first = std::make_unique<std::thread>(
+        std::thread{lzw_compress, chunk, ref(threads.back().second)});
+    assert(threads.back().first);
+    if (threads.size() >= 8) {
+      join_and_write(threads, compressed_text);
+    }
+  }
+
+  if (!threads.empty()) {
+    join_and_write(threads, compressed_text);
+  }
+
+  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);
+    compressed_text.push_back(std::move(ret));
+  }
+
   write_file(out, compressed_text);
-  out.close();
+
+  fclose(out);
+  input_file.close();
 }

src/compress.hh

@@ -1,14 +1,25 @@
+/**
+ *   \file compress.hh
+ *   \brief Header for compression functions
+ */
+
 #ifndef LZW_SRC_COMPRESS_H_
 #define LZW_SRC_COMPRESS_H_
 
 #include "common.hh"
+#include <vector>
 #include <iostream>
 #include <thread>
-#include <vector>
 
-[[nodiscard]] std::vector<std::vector<std::uint16_t>>
-lzw_compress(std::basic_string<unsigned char> &&);
+/// \brief Exécution des threads et écriture de leur résultat dans le fichier de sortie
+void join_and_write(std::vector<std::pair<std::unique_ptr<std::thread>,
+                                          std::vector<std::uint32_t>>> &,
+                    std::vector<std::vector<std::uint32_t>> &);
 
+/// \brief Compression d'une chaine de caractères
+void lzw_compress(const std::vector<char> &, std::vector<std::uint32_t> &);
+
+/// \brief Wrapper de \ref lzw_compress
 void compress(const std::string &, const char *);
 
 #endif /* LZW_SRC_COMPRESS_H_ */

src/io.cc

@@ -1,27 +1,95 @@
+/**
+ *   \file io.cc
+ *   \brief Body for file reading and writing
+ */
+
 #include "io.hh"
-#include "bitpack.hh"
-#include <array>
 
-using std::uint16_t;
-using std::vector;
-using vuint16 = vector<uint16_t>;
-using vvuint16 = vector<vuint16>;
-
-void write_file(std::ofstream &t_out, const vvuint16 &t_chunks) {
-  const auto nr_chunks = static_cast<uint16_t>(t_chunks.size());
 #ifdef Debug
-  std::printf("Number of chunks: %u\n", nr_chunks);
+constexpr bool debug_mode = true;
+#else
+constexpr bool debug_mode = false;
 #endif
-  t_out.write(reinterpret_cast<const char *>(&nr_chunks), sizeof(nr_chunks));
-  for (const auto &chunk : t_chunks) {
-    write_chunk(t_out, chunk);
+
+/**
+ *  Écrit dans le fichier \p t_out les chunks passés en paramètre. Le fichier de
+ *  sortie est composé des éléments suivants :\n
+ *  - Sur quatre octets sont écrit un `uint32_t` déterminant la taille d'un
+ *    caractère\n
+ *  - Sur quatre octets sont écrit un `uint32_t` déterminant le nombre de chunk
+ *    composant le fichier\n
+ *  - Sont ensuite écrits les chunks sur des nombres d’octets variable suivant
+ *    la taille d’un caractère et le nombre de caractères\n
+ *  \n
+ *  Un chunk est composé de la manière qui suit :\n
+ *  - Sur quatre octets sont écrit un `uint32_t` déterminant le nombre de
+ *    caractères composant le chunk\n
+ *  - Les caractères composant le chunk, accolés les uns au autres. Si le
+ *    dernier caractère ne remplis pas le dernier octet du chunk, alors ces
+ *    derniers bits seront initialisés à 0.\n
+ *  La taille d’un chunk est donc la taille d’un caractère multiplié par le
+ *  nombre de caractères du chunk, le tout divisé par 8. Si le résultat n’est
+ *  pas un entier, alors il est nivelé vers le haut pour avoir un nombre entier
+ *  d’octets (e.g. si le résultat est 103.4, alors 104 octets seront utilisés).
+ *
+ *  \param[out] t_out Fichier de sortie
+ *  \param[in] t_text Collection ordonnée des chunks à écrire dans \p t_out
+ */
+void write_file(FILE *t_out, std::vector<std::vector<std::uint32_t>> &t_text) {
+  {
+    uint32_t char_size = 12;
+    if constexpr (debug_mode) {
+      std::printf("Char size: %u\n", char_size);
+    }
+    fwrite(&char_size, sizeof(uint32_t), 1, t_out);
+    auto size = static_cast<uint32_t>(t_text.size());
+    if constexpr (debug_mode) {
+      std::printf("Number of chunks: %u\n", size);
+    }
+    fwrite(&size, sizeof(uint32_t), 1, t_out);
+  }
+  for(const auto &chunk : t_text) {
+    // write size of chunk in uint32_t
+    {
+      auto size = static_cast<uint32_t>(chunk.size());
+      if constexpr (debug_mode) {
+        std::printf("Size of chunk: %u\n", size);
+      }
+      fwrite(&size, sizeof(uint32_t), 1, t_out);
+    }
+    uint8_t remainder = 0x00;
+    for(size_t i = 0; i < chunk.size(); ++i) {
+      if(i % 2 == 0) {
+        // char = xxxx xxxx xxxx
+        //        ^^^^^^^^^ ^^^^
+        //          write   keep in remainder as xxxx0000
+        auto temp = static_cast<unsigned char>(chunk[i] >> 4);
+        fwrite(&temp, sizeof(temp), 1, t_out);
+        if constexpr (debug_mode) {
+          std::printf("writing: %x\t\t", temp);
+        }
+        remainder = static_cast<uint8_t>(chunk[i] << 4);
+      } else {
+        // already have `remainder = yyyy0000`
+        //          char = xxxx xxxx xxxx
+        //                 ^^^^ ^^^^^^^^^
+        // remainder = yyyyxxxx   write after remainder
+        // remainder = 00000000
+        remainder &= static_cast<unsigned char>(chunk[i]) >> 8 & 0xF0;
+        fwrite(&remainder, sizeof(remainder), 1, t_out);
+        if constexpr (debug_mode) {
+          std::printf("writing remainder: %x\t\t", remainder);
+        }
+        auto temp = static_cast<unsigned char>(chunk[i]);
+        fwrite(&temp, sizeof(temp), 1, t_out);
+        if constexpr (debug_mode) {
+          std::printf("writing: %x\n", temp);
+        }
+        remainder = 0x00;
+      }
+    }
+    if(remainder != 0) {
+      fwrite(&remainder, sizeof(remainder), 1, t_out);
+    }
   }
 }
-
-void write_chunk(std::ofstream &t_out, const vuint16 &t_chunk) {
-  const auto output = pack(t_chunk);
-  const auto chunk_size = static_cast<uint32_t>(output.size());
-  t_out.write(reinterpret_cast<const char *>(&chunk_size), sizeof(chunk_size));
-  t_out.write(reinterpret_cast<const char *>(output.data()),
-              sizeof(output[0]) * output.size());
-}

src/io.hh

@@ -1,15 +1,31 @@
+/**
+ *   \file io.h
+ *   \brief Header for file reading and writing
+ */
+
 #ifndef LZW_SRC_IO_H_
 #define LZW_SRC_IO_H_
 
-#include <cstdint>
 #include <cstdio>
-#include <fstream>
-#include <iostream>
+#include <cstdint>
 #include <vector>
 
-void write_file(std::ofstream &,
-                const std::vector<std::vector<std::uint16_t>> &);
+/*
+ * Un fichier compressé se compose ainsi :
+ * char_size : taille d'un caractère en bits (1B)
+ * nb_chunk : nombre de chunks (4B)
+ * chunks* : chunks
+ *
+ * Un chunk se compose ainsi :
+ * nb_char_chunk : nombre de caractères du chunk (2B)
+ * text* : caractères de taille char_size (ceil((char_size * nb_char_chunk) / 8))
+ *
+ * Si le dernier caractère ne termine pas le dernier octet du chunk, les
+ * derniers bits sont mit à zéro
+ */
 
-void write_chunk(std::ofstream &, const std::vector<std::uint16_t> &);
+
+/// \brief Écrit dans le fichier le texte compressé
+void write_file(FILE *, std::vector<std::vector<std::uint32_t>> &);
 
 #endif /* LZW_SRC_IO_H_ */

src/main.cc

@@ -1,45 +1,68 @@
+/**
+ *   \file main.cc
+ *   \brief Main file
+ *
+ *
+ *
+ */
+
+#ifdef Debug
+constexpr bool debug_mode = true;
+#else
+constexpr bool debug_mode = false;
+#endif
+
 #include "compress.hh"
-#include "uncompress.hh"
-#include <cassert>
-#include <getopt.h>
-#include <tuple>
+#include "getopt.h"
 
 using std::printf;
 using std::puts;
-using std::string;
-using std::tuple;
 
 // custom types ///////////////////////////////////////////////////////////////
 
+/*
+  Dictionnaire :
+  <
+      <
+          numéro chaine précédente,
+          caractère ASCII
+      >
+      numéro chaine courante
+  >
+ */
 using dic_t = std::map<std::pair<uint32_t, uint8_t>, uint32_t>;
 using ustring = std::basic_string<uint8_t>; // chaine non encodée
 using uvec = std::vector<uint32_t>;         // chaine encodée
 
+/**
+ *  \brief Affichage d’aide
+ */
 void help() {
-  puts("Usage:\n\
-lzw  [-options] [-i path] [-o path]\n\n\
-The default action is to compress the input file to a .lzw file\n\
-in which the directory in which the software is executed.\n\
-Options available:\n\
--h --help\n\
-\tdisplay the current message\n\
--i --input\n\
-\tpath to the input file (MANDATORY)\n\
--o --output\n\
-\tpath to the output file (if the file already exists, it will be\n\n\
-\toverwritten). Default: input path + \".lzw\\n\
--c --compress\n\
-\tcompress the input file\n\
--u --uncompress\n\
-\tuncompresses the input file to the output file. If no output path\n\
-\thas not been entered and if the input file ends with \".lzw\",\n\
-\tthe extension \".lzw\" will be removed; otherwise, the extension\n\
-\t\"_uncompresed\" will be added");
+  puts("Usage:");
+  puts("lzw  [-options] [-i path] [-o path]");
+  puts("\tThe default action is to compress the input file to a .lzw file");
+  puts("\tin which the directory in which the software is executed.");
+  puts("\tOptions available:");
+  puts("\t-i\tpath to the input file (mandatory)");
+  puts("\t-o\tpath to the output file (if the file already exists, it will");
+  puts("\t\tbe overwritten). Default: input path + \".lzw\"");
+  puts("\t-c\tcompress the input file");
+  puts("\t-d\tdecompresses the input file to the output file. If no output");
+  puts("\t\tpath has not been entered and if the input file ends with ");
+  puts("\t\t\".lzw\", the extension \".lzw\" will be removed; otherwise, the ");
+  puts("\t\textension \".uncompresed\" will be added");
 }
 
-[[nodiscard]] std::tuple<string, string, bool> process_args(int t_argc,
-                                                            char *t_argv[]) {
-  auto ret = std::make_tuple(string{}, string{}, true);
+int main(int argc, char *argv[]) {
+  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 (true) {
     int option_index = 0;
     static struct option long_options[] = {
@@ -49,49 +72,97 @@ Options available:\n\
         {"compress", no_argument, nullptr, 'c'},
         {"uncompress", no_argument, nullptr, 'u'},
         {nullptr, 0, nullptr, 0}};
-    int c = getopt_long(t_argc, t_argv, "hi:o:cu", long_options, &option_index);
+    int c = getopt_long(argc, argv, "hi:o:cu", long_options, &option_index);
     if (c == -1)
       break;
     switch (c) {
-    case 0:
+    case 0: {
+      if constexpr (debug_mode) {
+        printf("\noption %s", long_options[option_index].name);
+        if (optarg) {
+          printf(" with arg %s\n", optarg);
+        }
+      }
       break;
-    case 'h':
+    }
+    case 'h': {
+      if constexpr (debug_mode) {
+        printf("From main - option --help passed\n");
+      }
       help();
-      exit(0);
-    case 'i':
-      std::get<0>(ret) = optarg;
+      return 0;
+    }
+    case 'i': {
+      if constexpr (debug_mode) {
+        printf("From main - option --input with value '%s'\n", optarg);
+      }
+      input_path = optarg;
       break;
-    case 'o':
-      std::get<1>(ret) = optarg;
+    }
+    case 'o': {
+      if constexpr (debug_mode) {
+        printf("From main - option --output with value '%s'\n", optarg);
+      }
+      output_path = optarg;
       break;
-    case 'c':
-      std::get<2>(ret) = true;
+    }
+    case 'c': {
+      if constexpr (debug_mode) {
+        printf("From main - option --compress\n");
+      }
+      compressing = true;
       break;
-    case 'u':
-      std::get<2>(ret) = false;
+    }
+    case 'u': {
+      if constexpr (debug_mode) {
+        printf("From main - option --uncompress\n");
+      }
+      compressing = false;
       break;
+    }
     case '?':
-      [[fallthrough]];
-    default:
+    default: {
       puts("Error: unknown parameter.");
+      if constexpr (debug_mode) {
+        printf("From main - option -?\n");
+      }
       help();
-      exit(1);
+      return 1;
+    }
     }
   }
-  return ret;
-}
 
-int main(int argc, char *argv[]) {
-  const auto [input_path, output_path, compressing] = process_args(argc, argv);
   if (input_path.empty()) {
-    help();
-    return 0;
+    puts("Error: no input file specified");
+    return 2;
   }
+
   if (compressing) {
-    compress(input_path, (output_path.empty()) ? nullptr : output_path.c_str());
-  } else {
-    uncompress(input_path,
-               (output_path.empty()) ? nullptr : output_path.c_str());
+    /*
+      TODO:
+      - compresser le fichier d’entrée morceaux par morceaux, 16Ko à la fois
+      - écrire la taille du segment compressé, puis le segment compressé
+      - multithreading
+      - compression multiple : nombre de compressions puis fichier compressé
+      - bit-packing, limiter la taille du dictionnaire pour un certain nombre de
+        bits.
+     */
+    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 :(");
+    /*
+      Inversion des types du dictionnaire pour retrouver les chaînes plus
+      aisément
+     */
+  }
+
   return 0;
 }

src/uncompress.cc

@@ -1,60 +0,0 @@
-#include "uncompress.hh"
-#include "bitpack.hh"
-#include "common.hh"
-#include <cassert>
-#include <cstdio>
-#include <cstdlib>
-#include <fstream>
-#include <iterator>
-
-using std::fclose;
-using std::fopen;
-using std::fseek;
-using std::string;
-using std::uint16_t;
-using std::vector;
-using ustring = std::basic_string<unsigned char>;
-using vuint16 = vector<uint16_t>;
-
-[[nodiscard]] ustring lzw_uncompress(vuint16 &&t_compressed) {
-  ustring ret{};
-  uint16_t old = 0;
-  std::map<uint16_t, ustring> dict{};
-  ret.append({static_cast<unsigned char>(t_compressed[0])});
-  old = t_compressed[0];
-  for (auto it = t_compressed.begin() + 1; it != t_compressed.end(); ++it) {
-    const auto uncompressed{dico_uncompress(dict, *it, old)};
-    ret.insert(ret.end(), uncompressed.begin(), uncompressed.end());
-    old = *it;
-  }
-
-  return ret;
-}
-
-void uncompress(const string &t_input_name, const char *t_output_name) {
-  FILE *const input = std::fopen(t_input_name.c_str(), "rb");
-  assert(input);
-  std::ofstream output{(t_output_name != nullptr)
-                           ? t_output_name
-                           : t_input_name + "_uncompressed",
-                       std::ios::out | std::ios::binary};
-  assert(output.is_open());
-  uint16_t nb_chunks = 0;
-  std::fread(&nb_chunks, sizeof(nb_chunks), 1, input);
-  for (uint16_t i = 0; i < nb_chunks; ++i) {
-    uncompress_chunk(input, output);
-  }
-  output.close();
-  std::fclose(input);
-}
-
-void uncompress_chunk(FILE *const t_input, std::ofstream &t_output) {
-  uint32_t size_chunk = 0;
-  fread(&size_chunk, sizeof(size_chunk), 1, t_input);
-  auto chunk = std::make_unique<unsigned char[]>(size_chunk);
-  fread(chunk.get(), sizeof(unsigned char), size_chunk, t_input);
-  auto unpacked = unpack(ustring{chunk.get(), chunk.get() + size_chunk});
-  auto uncompressed_chunk = lzw_uncompress(std::move(unpacked));
-  t_output.write(reinterpret_cast<const char *>(uncompressed_chunk.data()),
-                 sizeof(uncompressed_chunk[0]) * uncompressed_chunk.size());
-}

src/uncompress.hh

@@ -1,16 +0,0 @@
-#ifndef LZW_SRC_UNCOMPRESS_H_
-#define LZW_SRC_UNCOMPRESS_H_
-
-#include <fstream>
-#include <memory>
-#include <string>
-#include <vector>
-
-[[nodiscard]] std::basic_string<unsigned char>
-lzw_uncompress(std::vector<std::uint16_t> &&);
-
-void uncompress(const std::string &, const char *);
-
-void uncompress_chunk(FILE *, std::ofstream &);
-
-#endif /* LZW_SRC_UNCOMPRESS_H_ */

src/utf8.cc

@@ -0,0 +1,52 @@
+/**
+ *   \file utf8.cc
+ *   \brief Implementation for UTF-8 related functions
+ */
+
+#include "utf8.hh"
+#include <string>
+
+using FILE = std::FILE;
+using uint8_t = std::uint8_t;
+using uint32_t = std::uint32_t;
+using ustring = std::basic_string<uint8_t>; // chaine non encodée
+
+/**
+ *  Les caractères \c passés en argument sont écrit dans le fichier de sortie au
+ *  format UTF-8
+ *
+ *  \param[in] out Fichier de sortie
+ *  \param[in] c Caractères à écrire dans \p out
+ */
+void write_utf8(FILE* t_out, uint32_t t_c) {
+  if(t_c < 128) {
+    fwrite(&t_c, sizeof(unsigned char), 1, t_out);
+    return;
+  }
+  size_t loops = 0;
+  unsigned char header = 0;
+  if (t_c < 2048) {
+    loops = 1;
+    header = 0xC0;
+  } else if (t_c < 65536) {
+    loops = 2;
+    header = 0xE0;
+  } else if (t_c < 2097152) {
+    loops = 3;
+    header = 0xF0;
+  } else if (t_c < 67108864) {
+    loops = 4;
+    header = 0xF8;
+  } else {
+    loops = 5;
+    header = 0xFC;
+  }
+
+  ustring str(loops + 1, 0);
+  for (size_t i = 0; i <= loops; ++i) {
+    str[i] = static_cast<unsigned char>(
+        ((t_c & ((i == loops) ? 0x3F : 0xFF)) >> ((loops - i) * 6)) +
+        ((i == 0) ? header : 0x80));
+  }
+  fwrite(str.data(), sizeof(unsigned char), str.size(), t_out);
+}

src/utf8.hh

@@ -0,0 +1,26 @@
+/**
+ *   \file utf8.hh
+ *   \brief Header for UTF-8 related functions
+ */
+
+#ifndef LZW_SRC_UTF8_H_
+#define LZW_SRC_UTF8_H_
+
+#include <cstdio>
+#include <cstdint>
+
+/*
+  L’encodage des caractères se fait en UTF-8
+  char < 128 => "0xxxxxxx" 7bits
+  char < 2,048 => "110xxxxx 10xxxxxx" 11bits
+  char < 65,536 => "1110xxxx 10xxxxxx 10xxxxxx" 16bits
+  char < 2,097,152 => "11110xxx 10xxxxxx 10xxxxxx 10xxxxxx" 21bits
+  char < 67,108,864 => "111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx" 26bits
+  char < 2,147,483,648 => "1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx" 31bits
+*/
+
+
+/// \brief Écrit les caractères au format UTF-8
+void write_utf8(std::FILE* t_out, std::uint32_t t_c);
+
+#endif /* LZW_SRC_UTF8_H_ */