sigpatch-updater/source/unzip.c

#include <stdio.h>
#include <minizip/unzip.h>
#include <string.h>
#include <dirent.h>
#include <switch.h>

#include "unzip.h"

#define WRITEBUFFERSIZE 0x1000 // 4KiB
#define MAXFILENAME     0x301

bool unzip(const char *output) {
    unzFile zfile = unzOpen(output);
    if (!zfile) {
        return false;
    }

    unz_global_info gi = {0};
    if (UNZ_OK != unzGetGlobalInfo(zfile, &gi)) {
        return false;
    }

    for (int i = 0; i < gi.number_entry; i++) {
        char filename_inzip[MAXFILENAME] = {0};
        unz_file_info file_info = {0};

        unzOpenCurrentFile(zfile);
        unzGetCurrentFileInfo(zfile, &file_info, filename_inzip, sizeof(filename_inzip), NULL, 0, NULL, 0);

        // check if the string ends with a /, if so, then its a directory.
        if ((filename_inzip[strlen(filename_inzip) - 1]) == '/') {
            // check if directory exists
            DIR *dir = opendir(filename_inzip);
            if (dir) {
                closedir(dir);
            } else {
                printf("creating directory: %s\n", filename_inzip);
                mkdir(filename_inzip, 0777);
            }
        } else {
            const char *write_filename = filename_inzip;
            FILE *outfile = fopen(write_filename, "wb");
            void *buf = malloc(WRITEBUFFERSIZE);

            printf("writing file: %s\n", filename_inzip);
            consoleUpdate(NULL);

            for (int j = unzReadCurrentFile(zfile, buf, WRITEBUFFERSIZE); j > 0; j = unzReadCurrentFile(zfile, buf, WRITEBUFFERSIZE)) {
                fwrite(buf, 1, j, outfile);
            }

            fclose(outfile);
            free(buf);
        }

        unzCloseCurrentFile(zfile);
        unzGoToNextFile(zfile);
        consoleUpdate(NULL);
    }

    unzClose(zfile);
    remove(output);

    // todo: i assume everything above works fine
    // this might not always be the case, add error handling!
    return true;
}