src/lhext.c

   1 /* ------------------------------------------------------------------------ */
   2 /* LHa for UNIX                                                             */
   3 /*              lhext.c -- LHarc extract                                    */
   4 /*                                                                          */
   5 /*      Copyright (C) MCMLXXXIX Yooichi.Tagawa                              */
   6 /*      Modified                Nobutaka Watazaki                           */
   7 /*                                                                          */
   8 /*  Ver. 0.00  Original                             1988.05.23  Y.Tagawa    */
   9 /*  Ver. 1.00  Fixed                                1989.09.22  Y.Tagawa    */
  10 /*  Ver. 0.03  LHa for UNIX                         1991.12.17  M.Oki       */
  11 /*  Ver. 1.12  LHa for UNIX                         1993.10.01  N.Watazaki  */
  12 /*  Ver. 1.13b Symbolic Link Update Bug Fix         1994.06.21  N.Watazaki  */
  13 /*  Ver. 1.14  Source All chagned                   1995.01.14  N.Watazaki  */
  14 /*  Ver. 1.14e bugfix                               1999.04.30  T.Okamoto   */
  15 /* ------------------------------------------------------------------------ */
  16 #include "lha.h"
  17 /* ------------------------------------------------------------------------ */
  18 static int      skip_flg = FALSE;   /* FALSE..No Skip , TRUE..Skip */
  19 static char    *methods[] =
  20 {
  21     LZHUFF0_METHOD, LZHUFF1_METHOD, LZHUFF2_METHOD, LZHUFF3_METHOD,
  22     LZHUFF4_METHOD, LZHUFF5_METHOD, LZHUFF6_METHOD, LZHUFF7_METHOD,
  23     LARC_METHOD, LARC5_METHOD, LARC4_METHOD,
  24     LZHDIRS_METHOD,
  25     NULL
  26 };
  27
  28 /* ------------------------------------------------------------------------ */
  29 static          boolean
  30 inquire_extract(name)
  31     char           *name;
  32 {
  33     struct stat     stbuf;
  34
  35     skip_flg = FALSE;
  36     if (stat(name, &stbuf) >= 0) {
  37         if (!is_regularfile(&stbuf)) {
  38             error("\"%s\" already exists (not a file)", name);
  39             return FALSE;
  40         }
  41
  42         if (noexec) {
  43             printf("EXTRACT %s but file is exist.\n", name);
  44             return FALSE;
  45         }
  46         else if (!force) {
  47             if (!isatty(0))
  48                 return FALSE;
  49
  50             switch (inquire("OverWrite ?(Yes/[No]/All/Skip)", name, "YyNnAaSs\n")) {
  51             case 0:
  52             case 1:/* Y/y */
  53                 break;
  54             case 2:
  55             case 3:/* N/n */
  56             case 8:/* Return */
  57                 return FALSE;
  58             case 4:
  59             case 5:/* A/a */
  60                 force = TRUE;
  61                 break;
  62             case 6:
  63             case 7:/* S/s */
  64                 skip_flg = TRUE;
  65                 break;
  66             }
  67         }
  68     }
  69     if (noexec)
  70         printf("EXTRACT %s\n", name);
  71
  72     return TRUE;
  73 }
  74
  75 /* ------------------------------------------------------------------------ */
  76 static          boolean
  77 make_parent_path(name)
  78     char           *name;
  79 {
  80     char            path[FILENAME_LENGTH];
  81     struct stat     stbuf;
  82     register char  *p;
  83
  84     /* make parent directory name into PATH for recursive call */
  85     strcpy(path, name);
  86     for (p = path + strlen(path); p > path; p--)
  87         if (p[-1] == '/') {
  88             *--p = '\0';
  89             break;
  90         }
  91
  92     if (p == path) {
  93         message("invalid path name \"%s\"", name);
  94         return FALSE;   /* no more parent. */
  95     }
  96
  97     if (GETSTAT(path, &stbuf) >= 0) {
  98         if (is_directory(&stbuf))
  99             return TRUE;
 100     }
 101
 102     if (verbose)
 103         message("Making directory \"%s\".", path);
 104
 105 #if defined __MINGW32__
 106     if (mkdir(path) >= 0)
 107         return TRUE;
 108 #else
 109     if (mkdir(path, 0777) >= 0) /* try */
 110         return TRUE;    /* successful done. */
 111 #endif
 112
 113     if (!make_parent_path(path))
 114         return FALSE;
 115
 116 #if defined __MINGW32__
 117     if (mkdir(path) < 0) {      /* try again */
 118         error("Cannot make directory \"%s\"", path);
 119         return FALSE;
 120     }
 121 #else
 122     if (mkdir(path, 0777) < 0) {    /* try again */
 123         error("Cannot make directory \"%s\"", path);
 124         return FALSE;
 125     }
 126 #endif
 127
 128     return TRUE;
 129 }
 130
 131 /* ------------------------------------------------------------------------ */
 132 static FILE    *
 133 open_with_make_path(name)
 134     char           *name;
 135 {
 136     FILE           *fp;
 137
 138     if ((fp = fopen(name, WRITE_BINARY)) == NULL) {
 139         if (!make_parent_path(name) ||
 140             (fp = fopen(name, WRITE_BINARY)) == NULL)
 141             error("Cannot extract a file \"%s\"", name);
 142     }
 143     return fp;
 144 }
 145
 146 /* ------------------------------------------------------------------------ */
 147 static void
 148 adjust_info(name, hdr)
 149     char           *name;
 150     LzHeader       *hdr;
 151 {
 152     struct utimbuf utimebuf;
 153
 154     /* adjust file stamp */
 155     utimebuf.actime = utimebuf.modtime = hdr->unix_last_modified_stamp;
 156
 157     if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) != UNIX_FILE_SYMLINK)
 158         utime(name, &utimebuf);
 159
 160     if (hdr->extend_type == EXTEND_UNIX
 161         || hdr->extend_type == EXTEND_OS68K
 162         || hdr->extend_type == EXTEND_XOSK) {
 163 #ifdef NOT_COMPATIBLE_MODE
 164         Please need your modification in this space.
 165 #else
 166         if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) != UNIX_FILE_SYMLINK)
 167             chmod(name, hdr->unix_mode);
 168 #endif
 169         if (!getuid()){
 170             uid_t uid = hdr->unix_uid;
 171             gid_t gid = hdr->unix_gid;
 172
 173 #if HAVE_GETPWNAM && HAVE_GETGRNAM
 174             if (hdr->user[0]) {
 175                 struct passwd *ent = getpwnam(hdr->user);
 176                 if (ent) uid = ent->pw_uid;
 177             }
 178             if (hdr->group[0]) {
 179                 struct group *ent = getgrnam(hdr->group);
 180                 if (ent) gid = ent->gr_gid;
 181             }
 182 #endif
 183
 184 #if HAVE_LCHOWN
 185             if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_SYMLINK)
 186                 lchown(name, uid, gid);
 187             else
 188 #endif /* HAVE_LCHWON */
 189                 chown(name, uid, gid);
 190         }
 191     }
 192 }
 193
 194 /* ------------------------------------------------------------------------ */
 195 static void
 196 extract_one(afp, hdr)
 197     FILE           *afp;    /* archive file */
 198     LzHeader       *hdr;
 199 {
 200     FILE           *fp; /* output file */
 201     struct stat     stbuf;
 202     char            name[FILENAME_LENGTH];
 203     unsigned int crc;
 204     int             method;
 205     boolean         save_quiet, save_verbose, up_flag;
 206     char           *q = hdr->name, c;
 207
 208     if (ignore_directory && strrchr(hdr->name, '/')) {
 209         q = (char *) strrchr(hdr->name, '/') + 1;
 210     }
 211     else {
 212         if (*q == '/') {
 213             q++;
 214             /*
 215              * if OSK then strip device name
 216              */
 217             if (hdr->extend_type == EXTEND_OS68K
 218                 || hdr->extend_type == EXTEND_XOSK) {
 219                 do
 220                     c = (*q++);
 221                 while (c && c != '/');
 222                 if (!c || !*q)
 223                     q = ".";    /* if device name only */
 224             }
 225         }
 226     }
 227
 228     if (extract_directory)
 229         xsnprintf(name, sizeof(name), "%s/%s", extract_directory, q);
 230     else
 231         strcpy(name, q);
 232
 233
 234     /* LZHDIRS_METHOD¤ò»ý¤Ä¥Ø¥Ã¥À¤ò¥Á¥§¥Ã¥¯¤¹¤ë */
 235     /* 1999.4.30 t.okamoto */
 236     for (method = 0;; method++) {
 237         if (methods[method] == NULL) {
 238             error("Unknown method \"%.*s\"; \"%s\" will be skiped ...",
 239                   5, hdr->method, name);
 240             return;
 241         }
 242         if (memcmp(hdr->method, methods[method], 5) == 0)
 243             break;
 244     }
 245
 246     if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_REGULAR
 247         && method != LZHDIRS_METHOD_NUM) {
 248     extract_regular:
 249 #if 0
 250         for (method = 0;; method++) {
 251             if (methods[method] == NULL) {
 252                 error("Unknown method \"%.*s\"; \"%s\" will be skiped ...",
 253                       5, hdr->method, name);
 254                 return;
 255             }
 256             if (memcmp(hdr->method, methods[method], 5) == 0)
 257                 break;
 258         }
 259 #endif
 260
 261         reading_filename = archive_name;
 262         writing_filename = name;
 263         if (output_to_stdout || verify_mode) {
 264             if (noexec) {
 265                 printf("%s %s\n", verify_mode ? "VERIFY" : "EXTRACT", name);
 266                 if (afp == stdin) {
 267                     int             i = hdr->packed_size;
 268                     while (i--)
 269                         fgetc(afp);
 270                 }
 271                 return;
 272             }
 273
 274             save_quiet = quiet;
 275             save_verbose = verbose;
 276             if (!quiet && output_to_stdout) {
 277                 printf("::::::::\n%s\n::::::::\n", name);
 278                 quiet = TRUE;
 279                 verbose = FALSE;
 280             }
 281             else if (verify_mode) {
 282                 quiet = FALSE;
 283                 verbose = TRUE;
 284             }
 285
 286 #if __MINGW32__
 287             {
 288                 int old_mode;
 289                 fflush(stdout);
 290                 old_mode = setmode(fileno(stdout), O_BINARY);
 291 #endif
 292
 293             crc = decode_lzhuf
 294                 (afp, stdout, hdr->original_size, hdr->packed_size, name, method);
 295 #if __MINGW32__
 296                 fflush(stdout);
 297                 setmode(fileno(stdout), old_mode);
 298             }
 299 #endif
 300             quiet = save_quiet;
 301             verbose = save_verbose;
 302         }
 303         else {
 304             if (skip_flg == FALSE)  {
 305                 up_flag = inquire_extract(name);
 306                 if (up_flag == FALSE && force == FALSE) {
 307                     return;
 308                 }
 309             }
 310
 311             if (skip_flg == TRUE) { /* if skip_flg */
 312                 if (stat(name, &stbuf) == 0 && force != TRUE) {
 313                     if (stbuf.st_mtime >= hdr->unix_last_modified_stamp) {
 314                         if (quiet != TRUE)
 315                             printf("%s : Skipped...\n", name);
 316                         return;
 317                     }
 318                 }
 319             }
 320             if (noexec) {
 321                 if (afp == stdin) {
 322                     int i = hdr->packed_size;
 323                     while (i--)
 324                         fgetc(afp);
 325                 }
 326                 return;
 327             }
 328
 329             signal(SIGINT, interrupt);
 330 #ifdef SIGHUP
 331             signal(SIGHUP, interrupt);
 332 #endif
 333
 334             unlink(name);
 335             remove_extracting_file_when_interrupt = TRUE;
 336
 337             if ((fp = open_with_make_path(name)) != NULL) {
 338                 crc = decode_lzhuf
 339                     (afp, fp, hdr->original_size, hdr->packed_size, name, method);
 340                 fclose(fp);
 341             }
 342             remove_extracting_file_when_interrupt = FALSE;
 343             signal(SIGINT, SIG_DFL);
 344 #ifdef SIGHUP
 345             signal(SIGHUP, SIG_DFL);
 346 #endif
 347             if (!fp)
 348                 return;
 349         }
 350
 351         if (hdr->has_crc && crc != hdr->crc)
 352             error("CRC error: \"%s\"", name);
 353     }
 354     else if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_DIRECTORY
 355              || (hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_SYMLINK
 356              || method == LZHDIRS_METHOD_NUM) {
 357         /* ¢¬¤³¤ì¤Ç¡¢Symbolic Link ¤Ï¡¢Âç¾æÉ×¤«¡© */
 358         if (!ignore_directory && !verify_mode) {
 359             if (noexec) {
 360                 if (quiet != TRUE)
 361                     printf("EXTRACT %s (directory)\n", name);
 362                 return;
 363             }
 364             /* NAME has trailing SLASH '/', (^_^) */
 365             if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_SYMLINK) {
 366                 int             l_code;
 367
 368 #ifdef S_IFLNK
 369                 if (skip_flg == FALSE)  {
 370                     up_flag = inquire_extract(name);
 371                     if (up_flag == FALSE && force == FALSE) {
 372                         return;
 373                     }
 374                 } else {
 375                     if (GETSTAT(name, &stbuf) == 0 && force != TRUE) {
 376                         if (stbuf.st_mtime >= hdr->unix_last_modified_stamp) {
 377                             if (quiet != TRUE)
 378                                 printf("%s : Skipped...\n", name);
 379                             return;
 380                         }
 381                     }
 382                 }
 383
 384                 unlink(name);
 385                 make_parent_path(name);
 386                 l_code = symlink(hdr->realname, name);
 387                 if (l_code < 0) {
 388                     if (quiet != TRUE)
 389                         warning("Can't make Symbolic Link \"%s\" -> \"%s\"",
 390                                 hdr->realname, name);
 391                 }
 392                 if (quiet != TRUE) {
 393                     message("Symbolic Link %s -> %s",
 394                             hdr->realname, name);
 395                 }
 396 #else
 397                 warning("Can't make Symbolic Link %s -> %s",
 398                         hdr->realname, name);
 399                 return;
 400 #endif
 401             } else { /* make directory */
 402                 if (!output_to_stdout && !make_parent_path(name))
 403                     return;
 404             }
 405         }
 406     }
 407     else {
 408         if (force)              /* force extract */
 409             goto extract_regular;
 410         else
 411             error("Unknown file type: \"%s\". use `f' option to force extract.", name);
 412     }
 413
 414     if (!output_to_stdout)
 415         adjust_info(name, hdr);
 416 }
 417
 418 /* ------------------------------------------------------------------------ */
 419 /* EXTRACT COMMAND MAIN                                                     */
 420 /* ------------------------------------------------------------------------ */
 421 void
 422 cmd_extract()
 423 {
 424     LzHeader        hdr;
 425     long            pos;
 426     FILE           *afp;
 427
 428     /* open archive file */
 429     if ((afp = open_old_archive()) == NULL)
 430         fatal_error("Cannot open archive file \"%s\"", archive_name);
 431
 432     if (archive_is_msdos_sfx1(archive_name))
 433         skip_msdos_sfx1_code(afp);
 434
 435     /* extract each files */
 436     while (get_header(afp, &hdr)) {
 437         if (need_file(hdr.name)) {
 438             pos = ftell(afp);
 439             extract_one(afp, &hdr);
 440             /* when error occurred in extract_one(), should adjust
 441                point of file stream */
 442             if (afp != stdin)
 443                 fseek(afp, pos + hdr.packed_size, SEEK_SET);
 444             else {
 445                 /* FIXME: assume that the extract_one() has read
 446                    packed_size bytes from stdin. */
 447                 long i = 0;
 448                 while (i--) fgetc(afp);
 449             }
 450         } else {
 451             if (afp != stdin)
 452                 fseek(afp, hdr.packed_size, SEEK_CUR);
 453             else {
 454                 int             i = hdr.packed_size;
 455                 while (i--)
 456                     fgetc(afp);
 457             }
 458         }
 459     }
 460
 461     /* close archive file */
 462     fclose(afp);
 463
 464     return;
 465 }