minizip-ng/miniunz.c

/* miniunz.c
   Version 1.2.0, September 16th, 2017
   sample part of the MiniZip project

   Copyright (C) 2012-2017 Nathan Moinvaziri
     https://github.com/nmoinvaz/minizip
   Copyright (C) 2009-2010 Mathias Svensson
     Modifications for Zip64 support
     http://result42.com
   Copyright (C) 2007-2008 Even Rouault
     Modifications of Unzip for Zip64
   Copyright (C) 1998-2010 Gilles Vollant
     http://www.winimage.com/zLibDll/minizip.html

   This program is distributed under the terms of the same license as zlib.
   See the accompanying LICENSE file for the full text of the license.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>

#ifdef _WIN32
#  include <direct.h>
#  include <io.h>
#else
#  include <sys/stat.h>
#  include <unistd.h>
#  include <utime.h>
#endif

#include "unzip.h"

#ifdef _WIN32
#  define USEWIN32IOAPI
#  include "iowin32.h"
#endif

#include "minishared.h"

void miniunz_banner()
{
    printf("MiniUnz 1.2.0, demo of zLib + Unz package\n");
    printf("more info at https://github.com/nmoinvaz/minizip\n\n");
}

void miniunz_help()
{
    printf("Usage : miniunz [-e] [-x] [-v] [-l] [-o] [-p password] file.zip [file_to_extr.] [-d extractdir]\n\n" \
           "  -e  Extract without path (junk paths)\n" \
           "  -x  Extract with path\n" \
           "  -v  list files\n" \
           "  -l  list files\n" \
           "  -d  directory to extract into\n" \
           "  -o  overwrite files without prompting\n" \
           "  -p  extract crypted file using password\n\n");
}

int miniunz_list(unzFile uf)
{
    int err = unzGoToFirstFile(uf);
    if (err != UNZ_OK)
    {
        printf("error %d with zipfile in unzGoToFirstFile\n", err);
        return 1;
    }

    printf("  Length  Method     Size Ratio   Date    Time   CRC-32     Name\n");
    printf("  ------  ------     ---- -----   ----    ----   ------     ----\n");

    do
    {
        char filename_inzip[256] = {0};
        unz_file_info64 file_info = {0};
        uint32_t ratio = 0;
        struct tm tmu_date = { 0 };
        const char *string_method = NULL;
        char char_crypt = ' ';

        err = unzGetCurrentFileInfo64(uf, &file_info, filename_inzip, sizeof(filename_inzip), NULL, 0, NULL, 0);
        if (err != UNZ_OK)
        {
            printf("error %d with zipfile in unzGetCurrentFileInfo\n", err);
            break;
        }

        if (file_info.uncompressed_size > 0)
            ratio = (uint32_t)((file_info.compressed_size * 100) / file_info.uncompressed_size);

        /* Display a '*' if the file is encrypted */
        if ((file_info.flag & 1) != 0)
            char_crypt = '*';

        if (file_info.compression_method == 0)
            string_method = "Stored";
        else if (file_info.compression_method == Z_DEFLATED)
        {
            uint16_t level = (uint16_t)((file_info.flag & 0x6) / 2);
            if (level == 0)
                string_method = "Defl:N";
            else if (level == 1)
                string_method = "Defl:X";
            else if ((level == 2) || (level == 3))
                string_method = "Defl:F"; /* 2:fast , 3 : extra fast*/
            else
                string_method = "Unkn. ";
        }
        else if (file_info.compression_method == Z_BZIP2ED)
        {
            string_method = "BZip2 ";
        }
        else
            string_method = "Unkn. ";

        display_zpos64(file_info.uncompressed_size, 7);
        printf("  %6s%c", string_method, char_crypt);
        display_zpos64(file_info.compressed_size, 7);

        dosdate_to_tm(file_info.dos_date, &tmu_date);
        printf(" %3u%%  %2.2u-%2.2u-%2.2u  %2.2u:%2.2u  %8.8x   %s\n", ratio,
            (uint32_t)tmu_date.tm_mon + 1, (uint32_t)tmu_date.tm_mday,
            (uint32_t)tmu_date.tm_year % 100,
            (uint32_t)tmu_date.tm_hour, (uint32_t)tmu_date.tm_min,
            file_info.crc, filename_inzip);

        err = unzGoToNextFile(uf);
    }
    while (err == UNZ_OK);

    if (err != UNZ_END_OF_LIST_OF_FILE && err != UNZ_OK)
    {
        printf("error %d with zipfile in unzGoToNextFile\n", err);
        return err;
    }

    return 0;
}

int miniunz_extract_currentfile(unzFile uf, int opt_extract_without_path, int *popt_overwrite, const char *password)
{
    unz_file_info64 file_info = {0};
    FILE* fout = NULL;
    void* buf = NULL;
    uint16_t size_buf = 8192;
    int err = UNZ_OK;
    int errclose = UNZ_OK;
    int skip = 0;
    char filename_inzip[256] = {0};
    char *filename_withoutpath = NULL;
    const char *write_filename = NULL;
    char *p = NULL;

    err = unzGetCurrentFileInfo64(uf, &file_info, filename_inzip, sizeof(filename_inzip), NULL, 0, NULL, 0);
    if (err != UNZ_OK)
    {
        printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
        return err;
    }

    p = filename_withoutpath = filename_inzip;
    while (*p != 0)
    {
        if ((*p == '/') || (*p == '\\'))
            filename_withoutpath = p+1;
        p++;
    }

    /* If zip entry is a directory then create it on disk */
    if (*filename_withoutpath == 0)
    {
        if (opt_extract_without_path == 0)
        {
            printf("creating directory: %s\n", filename_inzip);
            MKDIR(filename_inzip);
        }
        return err;
    }

    buf = (void*)malloc(size_buf);
    if (buf == NULL)
    {
        printf("Error allocating memory\n");
        return UNZ_INTERNALERROR;
    }

    err = unzOpenCurrentFilePassword(uf, password);
    if (err != UNZ_OK)
        printf("error %d with zipfile in unzOpenCurrentFilePassword\n", err);

    if (opt_extract_without_path)
        write_filename = filename_withoutpath;
    else
        write_filename = filename_inzip;

    /* Determine if the file should be overwritten or not and ask the user if needed */
    if ((err == UNZ_OK) && (*popt_overwrite == 0) && (check_file_exists(write_filename)))
    {
        char rep = 0;
        do
        {
            char answer[128];
            printf("The file %s exists. Overwrite ? [y]es, [n]o, [A]ll: ", write_filename);
            if (scanf("%1s", answer) != 1)
                exit(EXIT_FAILURE);
            rep = answer[0];
            if ((rep >= 'a') && (rep <= 'z'))
                rep -= 0x20;
        }
        while ((rep != 'Y') && (rep != 'N') && (rep != 'A'));

        if (rep == 'N')
            skip = 1;
        if (rep == 'A')
            *popt_overwrite = 1;
    }

    /* Create the file on disk so we can unzip to it */
    if ((skip == 0) && (err == UNZ_OK))
    {
        fout = fopen64(write_filename, "wb");
        /* Some zips don't contain directory alone before file */
        if ((fout == NULL) && (opt_extract_without_path == 0) &&
            (filename_withoutpath != (char*)filename_inzip))
        {
            char c = *(filename_withoutpath-1);
            *(filename_withoutpath-1) = 0;
            makedir(write_filename);
            *(filename_withoutpath-1) = c;
            fout = fopen64(write_filename, "wb");
        }
        if (fout == NULL)
            printf("error opening %s\n", write_filename);
    }

    /* Read from the zip, unzip to buffer, and write to disk */
    if (fout != NULL)
    {
        printf(" extracting: %s\n", write_filename);

        do
        {
            err = unzReadCurrentFile(uf, buf, size_buf);
            if (err < 0)
            {
                printf("error %d with zipfile in unzReadCurrentFile\n", err);
                break;
            }
            if (err == 0)
                break;
            if (fwrite(buf, err, 1, fout) != 1)
            {
                printf("error %d in writing extracted file\n", errno);
                err = UNZ_ERRNO;
                break;
            }
        }
        while (err > 0);

        if (fout)
            fclose(fout);

        /* Set the time of the file that has been unzipped */
        if (err == 0)
            change_file_date(write_filename, file_info.dos_date);
    }

    errclose = unzCloseCurrentFile(uf);
    if (errclose != UNZ_OK)
        printf("error %d with zipfile in unzCloseCurrentFile\n", errclose);

    free(buf);
    return err;
}

int miniunz_extract_all(unzFile uf, int opt_extract_without_path, int opt_overwrite, const char *password)
{
    int err = unzGoToFirstFile(uf);
    if (err != UNZ_OK)
    {
        printf("error %d with zipfile in unzGoToFirstFile\n", err);
        return 1;
    }

    do
    {
        err = miniunz_extract_currentfile(uf, opt_extract_without_path, &opt_overwrite, password);
        if (err != UNZ_OK)
            break;
        err = unzGoToNextFile(uf);
    }
    while (err == UNZ_OK);

    if (err != UNZ_END_OF_LIST_OF_FILE)
    {
        printf("error %d with zipfile in unzGoToNextFile\n", err);
        return 1;
    }
    return 0;
}

int miniunz_extract_onefile(unzFile uf, const char *filename, int opt_extract_without_path, int opt_overwrite,
    const char *password)
{
    if (unzLocateFile(uf, filename, NULL) != UNZ_OK)
    {
        printf("file %s not found in the zipfile\n", filename);
        return 2;
    }
    if (miniunz_extract_currentfile(uf, opt_extract_without_path, &opt_overwrite, password) == UNZ_OK)
        return 0;
    return 1;
}

#ifndef NOMAIN
int main(int argc, const char *argv[])
{
    const char *zipfilename = NULL;
    const char *filename_to_extract = NULL;
    const char *password = NULL;
    int i = 0;
    int ret = 0;
    int opt_do_list = 0;
    int opt_do_extract = 1;
    int opt_do_extract_withoutpath = 0;
    int opt_overwrite = 0;
    int opt_extractdir = 0;
    const char *dirname = NULL;
    unzFile uf = NULL;

    miniunz_banner();
    if (argc == 1)
    {
        miniunz_help();
        return 0;
    }

    /* Parse command line options */
    for (i = 1; i < argc; i++)
    {
        if ((*argv[i]) == '-')
        {
            const char *p = argv[i]+1;

            while (*p != 0)
            {
                char c = *(p++);
                if ((c == 'l') || (c == 'L'))
                    opt_do_list = 1;
                if ((c == 'v') || (c == 'V'))
                    opt_do_list = 1;
                if ((c == 'x') || (c == 'X'))
                    opt_do_extract = 1;
                if ((c == 'e') || (c == 'E'))
                    opt_do_extract = opt_do_extract_withoutpath = 1;
                if ((c == 'o') || (c == 'O'))
                    opt_overwrite = 1;
                if ((c == 'd') || (c == 'D'))
                {
                    opt_extractdir = 1;
                    dirname = argv[i+1];
                }

                if (((c == 'p') || (c == 'P')) && (i+1 < argc))
                {
                    password = argv[i+1];
                    i++;
                }
            }
        }
        else
        {
            if (zipfilename == NULL)
                zipfilename = argv[i];
            else if ((filename_to_extract == NULL) && (!opt_extractdir))
                filename_to_extract = argv[i];
        }
    }

    /* Open zip file */
    if (zipfilename != NULL)
    {
#ifdef USEWIN32IOAPI
        zlib_filefunc64_def ffunc;
        fill_win32_filefunc64A(&ffunc);
        uf = unzOpen2_64(zipfilename, &ffunc);
#else
        uf = unzOpen64(zipfilename);
#endif
    }

    if (uf == NULL)
    {
        printf("Cannot open %s\n", zipfilename);
        return 1;
    }

    printf("%s opened\n", zipfilename);

    /* Process command line options */
    if (opt_do_list == 1)
    {
        ret = miniunz_list(uf);
    }
    else if (opt_do_extract == 1)
    {
        if (opt_extractdir && CHDIR(dirname))
        {
            printf("Error changing into %s, aborting\n", dirname);
            exit(-1);
        }

        if (filename_to_extract == NULL)
            ret = miniunz_extract_all(uf, opt_do_extract_withoutpath, opt_overwrite, password);
        else
            ret = miniunz_extract_onefile(uf, filename_to_extract, opt_do_extract_withoutpath, opt_overwrite, password);
    }

    unzClose(uf);
    return ret;
}
#endif