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 }
 466
 467 /* Local Variables: */
 468 /* mode:c */
 469 /* tab-width:4 */
 470 /* End: */
 471 /* vi: set tabstop=4: */