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                 error("Not a directory \"%s\"", path);
 101                 return FALSE;
 102         }
 103
 104         if (verbose)
 105                 message("Making directory \"%s\".", path);
 106
 107 #if defined __MINGW32__
 108     if (mkdir(path) >= 0)
 109         return TRUE;
 110 #else
 111         if (mkdir(path, 0777) >= 0)     /* try */
 112                 return TRUE;    /* successful done. */
 113 #endif
 114
 115         if (!make_parent_path(path))
 116                 return FALSE;
 117
 118 #if defined __MINGW32__
 119     if (mkdir(path) < 0) {      /* try again */
 120         error("Cannot make directory \"%s\"", path);
 121         return FALSE;
 122     }
 123 #else
 124         if (mkdir(path, 0777) < 0) {    /* try again */
 125         error("Cannot make directory \"%s\"", path);
 126         return FALSE;
 127         }
 128 #endif
 129
 130         return TRUE;
 131 }
 132
 133 /* ------------------------------------------------------------------------ */
 134 static FILE    *
 135 open_with_make_path(name)
 136         char           *name;
 137 {
 138         FILE           *fp;
 139
 140         if ((fp = fopen(name, WRITE_BINARY)) == NULL) {
 141                 if (!make_parent_path(name) ||
 142                     (fp = fopen(name, WRITE_BINARY)) == NULL)
 143                         error("Cannot extract a file \"%s\"", name);
 144         }
 145         return fp;
 146 }
 147
 148 /* ------------------------------------------------------------------------ */
 149 static void
 150 adjust_info(name, hdr)
 151         char           *name;
 152         LzHeader       *hdr;
 153 {
 154     struct utimbuf utimebuf;
 155
 156         /* adjust file stamp */
 157         utimebuf.actime = utimebuf.modtime = hdr->unix_last_modified_stamp;
 158
 159         if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) != UNIX_FILE_SYMLINK)
 160                 utime(name, &utimebuf);
 161
 162         if (hdr->extend_type == EXTEND_UNIX
 163             || hdr->extend_type == EXTEND_OS68K
 164             || hdr->extend_type == EXTEND_XOSK) {
 165 #ifdef NOT_COMPATIBLE_MODE
 166                 Please need your modification in this space.
 167 #else
 168                 if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) != UNIX_FILE_SYMLINK)
 169                         chmod(name, hdr->unix_mode);
 170 #endif
 171                 if (!getuid()){
 172             uid_t uid = hdr->unix_uid;
 173             gid_t gid = hdr->unix_gid;
 174
 175 #if HAVE_GETPWNAM && HAVE_GETGRNAM
 176             if (hdr->user[0]) {
 177                 struct passwd *ent = getpwnam(hdr->user);
 178                 if (ent) uid = ent->pw_uid;
 179             }
 180             if (hdr->group[0]) {
 181                 struct group *ent = getgrnam(hdr->group);
 182                 if (ent) gid = ent->gr_gid;
 183             }
 184 #endif
 185
 186 #if HAVE_LCHOWN
 187                         if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_SYMLINK)
 188                                 lchown(name, uid, gid);
 189                         else
 190 #endif /* HAVE_LCHWON */
 191                                 chown(name, uid, gid);
 192                 }
 193         }
 194 }
 195
 196 /* ------------------------------------------------------------------------ */
 197 static void
 198 extract_one(afp, hdr)
 199         FILE           *afp;    /* archive file */
 200         LzHeader       *hdr;
 201 {
 202         FILE           *fp;     /* output file */
 203         struct stat     stbuf;
 204         char            name[FILENAME_LENGTH];
 205         unsigned int crc;
 206         int             method;
 207         boolean         save_quiet, save_verbose, up_flag;
 208         char           *q = hdr->name, c;
 209
 210         if (ignore_directory && strrchr(hdr->name, '/')) {
 211                 q = (char *) strrchr(hdr->name, '/') + 1;
 212         }
 213         else {
 214                 if (*q == '/') {
 215                         q++;
 216                         /*
 217                          * if OSK then strip device name
 218                          */
 219                         if (hdr->extend_type == EXTEND_OS68K
 220                             || hdr->extend_type == EXTEND_XOSK) {
 221                                 do
 222                                         c = (*q++);
 223                                 while (c && c != '/');
 224                                 if (!c || !*q)
 225                                         q = ".";        /* if device name only */
 226                         }
 227                 }
 228         }
 229
 230         if (extract_directory)
 231                 xsnprintf(name, sizeof(name), "%s/%s", extract_directory, q);
 232         else
 233                 strcpy(name, q);
 234
 235
 236         /* LZHDIRS_METHOD¤ò»ý¤Ä¥Ø¥Ã¥À¤ò¥Á¥§¥Ã¥¯¤¹¤ë */
 237         /* 1999.4.30 t.okamoto */
 238         for (method = 0;; method++) {
 239                 if (methods[method] == NULL) {
 240                         error("Unknown method \"%.*s\"; \"%s\" will be skiped ...",
 241                   5, hdr->method, name);
 242                         return;
 243                 }
 244                 if (memcmp(hdr->method, methods[method], 5) == 0)
 245                         break;
 246         }
 247
 248         if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_REGULAR
 249                 && method != LZHDIRS_METHOD_NUM) {
 250     extract_regular:
 251 #if 0
 252                 for (method = 0;; method++) {
 253                         if (methods[method] == NULL) {
 254                 error("Unknown method \"%.*s\"; \"%s\" will be skiped ...",
 255                       5, hdr->method, name);
 256                                 return;
 257                         }
 258                         if (memcmp(hdr->method, methods[method], 5) == 0)
 259                                 break;
 260                 }
 261 #endif
 262
 263                 reading_filename = archive_name;
 264                 writing_filename = name;
 265                 if (output_to_stdout || verify_mode) {
 266                         if (noexec) {
 267                                 printf("%s %s\n", verify_mode ? "VERIFY" : "EXTRACT", name);
 268                                 if (afp == stdin) {
 269                                         int             i = hdr->packed_size;
 270                                         while (i--)
 271                                                 fgetc(afp);
 272                                 }
 273                                 return;
 274                         }
 275
 276                         save_quiet = quiet;
 277                         save_verbose = verbose;
 278                         if (!quiet && output_to_stdout) {
 279                                 printf("::::::::\n%s\n::::::::\n", name);
 280                                 quiet = TRUE;
 281                                 verbose = FALSE;
 282                         }
 283                         else if (verify_mode) {
 284                                 quiet = FALSE;
 285                                 verbose = TRUE;
 286                         }
 287
 288 #if __MINGW32__
 289             {
 290                 int old_mode;
 291                 fflush(stdout);
 292                 old_mode = setmode(fileno(stdout), O_BINARY);
 293 #endif
 294
 295                         crc = decode_lzhuf
 296                                 (afp, stdout, hdr->original_size, hdr->packed_size, name, method);
 297 #if __MINGW32__
 298                 fflush(stdout);
 299                 setmode(fileno(stdout), old_mode);
 300             }
 301 #endif
 302                         quiet = save_quiet;
 303                         verbose = save_verbose;
 304                 }
 305                 else {
 306                         if (skip_flg == FALSE)  {
 307                                 up_flag = inquire_extract(name);
 308                                 if (up_flag == FALSE && force == FALSE) {
 309                                         return;
 310                                 }
 311                         }
 312
 313                         if (skip_flg == TRUE) { /* if skip_flg */
 314                                 if (stat(name, &stbuf) == 0 && force != TRUE) {
 315                                         if (stbuf.st_mtime >= hdr->unix_last_modified_stamp) {
 316                                                 if (quiet != TRUE)
 317                                                         printf("%s : Skipped...\n", name);
 318                                                 return;
 319                                         }
 320                                 }
 321                         }
 322                         if (noexec) {
 323                                 if (afp == stdin) {
 324                                         int i = hdr->packed_size;
 325                                         while (i--)
 326                                                 fgetc(afp);
 327                                 }
 328                                 return;
 329                         }
 330
 331                         signal(SIGINT, interrupt);
 332 #ifdef SIGHUP
 333                         signal(SIGHUP, interrupt);
 334 #endif
 335
 336                         unlink(name);
 337                         remove_extracting_file_when_interrupt = TRUE;
 338
 339                         if ((fp = open_with_make_path(name)) != NULL) {
 340                                 crc = decode_lzhuf
 341                                         (afp, fp, hdr->original_size, hdr->packed_size, name, method);
 342                                 fclose(fp);
 343                         }
 344                         remove_extracting_file_when_interrupt = FALSE;
 345                         signal(SIGINT, SIG_DFL);
 346 #ifdef SIGHUP
 347                         signal(SIGHUP, SIG_DFL);
 348 #endif
 349                         if (!fp)
 350                                 return;
 351                 }
 352
 353                 if (hdr->has_crc && crc != hdr->crc)
 354                         error("CRC error: \"%s\"", name);
 355         }
 356         else if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_DIRECTORY
 357                          || (hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_SYMLINK
 358                          || method == LZHDIRS_METHOD_NUM) {
 359                 /* ¢¬¤³¤ì¤Ç¡¢Symbolic Link ¤Ï¡¢Âç¾æÉ×¤«¡© */
 360                 if (!ignore_directory && !verify_mode) {
 361                         if (noexec) {
 362                                 if (quiet != TRUE)
 363                                         printf("EXTRACT %s (directory)\n", name);
 364                                 return;
 365                         }
 366                         /* NAME has trailing SLASH '/', (^_^) */
 367                         if ((hdr->unix_mode & UNIX_FILE_TYPEMASK) == UNIX_FILE_SYMLINK) {
 368                                 int             l_code;
 369
 370 #ifdef S_IFLNK
 371                                 if (skip_flg == FALSE)  {
 372                                         up_flag = inquire_extract(name);
 373                                         if (up_flag == FALSE && force == FALSE) {
 374                                                 return;
 375                                         }
 376                                 } else {
 377                                         if (GETSTAT(name, &stbuf) == 0 && force != TRUE) {
 378                                                 if (stbuf.st_mtime >= hdr->unix_last_modified_stamp) {
 379                                                         if (quiet != TRUE)
 380                                                                 printf("%s : Skipped...\n", name);
 381                                                         return;
 382                                                 }
 383                                         }
 384                                 }
 385
 386                                 unlink(name);
 387                 make_parent_path(name);
 388                                 l_code = symlink(hdr->realname, name);
 389                                 if (l_code < 0) {
 390                                         if (quiet != TRUE)
 391                                                 warning("Can't make Symbolic Link \"%s\" -> \"%s\"",
 392                                 hdr->realname, name);
 393                                 }
 394                                 if (quiet != TRUE) {
 395                                         message("Symbolic Link %s -> %s",
 396                             hdr->realname, name);
 397                                 }
 398 #else
 399                                 warning("Can't make Symbolic Link %s -> %s",
 400                         hdr->realname, name);
 401                                 return;
 402 #endif
 403                         } else { /* make directory */
 404                                 if (!output_to_stdout && !make_parent_path(name))
 405                                         return;
 406                         }
 407                 }
 408         }
 409         else {
 410         if (force)              /* force extract */
 411             goto extract_regular;
 412         else
 413             error("Unknown file type: \"%s\". use `f' option to force extract.", name);
 414         }
 415
 416         if (!output_to_stdout)
 417                 adjust_info(name, hdr);
 418 }
 419
 420 /* ------------------------------------------------------------------------ */
 421 /* EXTRACT COMMAND MAIN                                                                                                         */
 422 /* ------------------------------------------------------------------------ */
 423 void
 424 cmd_extract()
 425 {
 426         LzHeader        hdr;
 427         long            pos;
 428         FILE           *afp;
 429
 430         /* open archive file */
 431         if ((afp = open_old_archive()) == NULL)
 432                 fatal_error("Cannot open archive file \"%s\"", archive_name);
 433
 434         if (archive_is_msdos_sfx1(archive_name))
 435                 skip_msdos_sfx1_code(afp);
 436
 437         /* extract each files */
 438         while (get_header(afp, &hdr)) {
 439                 if (need_file(hdr.name)) {
 440                         pos = ftell(afp);
 441                         extract_one(afp, &hdr);
 442             /* when error occurred in extract_one(), should adjust
 443                point of file stream */
 444                         if (afp != stdin)
 445                 fseek(afp, pos + hdr.packed_size, SEEK_SET);
 446             else {
 447                 /* FIXME: assume that the extract_one() has read
 448                    packed_size bytes from stdin. */
 449                 long i = 0;
 450                                 while (i--) fgetc(afp);
 451             }
 452                 } else {
 453                         if (afp != stdin)
 454                                 fseek(afp, hdr.packed_size, SEEK_CUR);
 455                         else {
 456                                 int             i = hdr.packed_size;
 457                                 while (i--)
 458                                         fgetc(afp);
 459                         }
 460                 }
 461         }
 462
 463         /* close archive file */
 464         fclose(afp);
 465
 466         return;
 467 }
 468
 469 /* Local Variables: */
 470 /* mode:c */
 471 /* tab-width:4 */
 472 /* End: */
 473 /* vi: set tabstop=4: */