153 lines
3.7 KiB
C++
153 lines
3.7 KiB
C++
/**
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* \file main.cc
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* \brief Main file
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*
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*
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*
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*/
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#include "compress.hh"
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#include "getopt.h"
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using std::printf;
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using std::puts;
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// custom types ///////////////////////////////////////////////////////////////
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/*
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Dictionnaire :
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<
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<
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numéro chaine précédente,
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caractère ASCII
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>
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numéro chaine courante
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>
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*/
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using dic_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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/**
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* \brief Affichage d’aide
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*/
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void help() {
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puts("Usage:");
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puts("lzw [-options] [-i path] [-o path]");
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puts("\tThe default action is to compress the input file to a .lzw file");
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puts("\tin which the directory in which the software is executed.");
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puts("\tOptions available:");
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puts("\t-i\tpath to the input file (mandatory)");
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puts("\t-o\tpath to the output file (if the file already exists, it will");
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puts("\t\tbe overwritten). Default: input path + \".lzw\"");
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puts("\t-c\tcompress the input file");
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puts("\t-d\tdecompresses the input file to the output file. If no output");
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puts("\t\tpath has not been entered and if the input file ends with ");
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puts("\t\t\".lzw\", the extension \".lzw\" will be removed; otherwise, the ");
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puts("\t\textension \".uncompresed\" will be added");
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}
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int main(int argc, char *argv[]) {
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#ifdef Debug
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for (int i = 0; i < argc; ++i)
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printf("argv[%d] = %s\n", i, argv[i]);
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#endif
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std::string input_path{};
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std::string output_path{};
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bool compressing = true;
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while (1) {
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int option_index = 0;
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static struct option long_options[] = {
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{"help", no_argument, nullptr, 'h'},
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{"input", required_argument, nullptr, 'i'},
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{"output", required_argument, nullptr, 'o'},
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{"compress", no_argument, nullptr, 'c'},
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{"uncompress", no_argument, nullptr, 'u'},
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{0, 0, 0, 0}};
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int c = getopt_long(argc, argv, "hi:o:cu", long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 0: {
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#ifdef Debug
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printf("\noption %s", long_options[option_index].name);
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if (optarg) {
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printf(" with arg %s\n", optarg);
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}
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#endif
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break;
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}
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case 'h': {
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#ifdef Debug
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printf("From main - option --help passed\n");
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#endif
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help();
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return 0;
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}
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case 'i': {
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#ifdef Debug
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printf("From main - option --input with value '%s'\n", optarg);
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#endif
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input_path = optarg;
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break;
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}
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case 'o': {
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#ifdef Debug
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printf("From main - option --output with value '%s'\n", optarg);
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#endif
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output_path = optarg;
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break;
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}
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case 'c': {
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#ifdef Debug
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printf("From main - option --compress\n");
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#endif
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compressing = true;
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break;
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}
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case 'u': {
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#ifdef Debug
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printf("From main - option --uncompress\n");
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#endif
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compressing = false;
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break;
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}
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case '?': {
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puts("Error: unknown parameter.");
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#ifdef Debug
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printf("From main - option -?\n");
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#endif
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help();
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return 1;
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}
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}
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}
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if (input_path == "") {
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puts("Error: no input file specified");
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return 2;
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}
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if (compressing) {
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/*
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TODO:
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- compresser le fichier d’entrée morceaux par morceaux, 16Ko à la fois
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- écrire la taille du segment compressé, puis le segment compressé
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- multithreading
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- compression multiple : nombre de compressions puis fichier compressé
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- bit-packing, limiter la taille du dictionnaire pour un certain nombre de
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bits.
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*/
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compress(input_path, output_path.c_str());
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} else {
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puts("Not yet implemented :(");
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/*
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Inversion des types du dictionnaire pour retrouver les chaînes plus aisément
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*/
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}
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return 0;
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}
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