Dogcows Code - chaz/tar/blob - src/xheader.c

   1 /* POSIX extended headers for tar.
   2
   3    Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 2, or (at your option) any later
   8    version.
   9
  10    This program is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  13    Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, write to the Free Software Foundation, Inc.,
  17    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #include <system.h>
  20
  21 #include <fnmatch.h>
  22 #include <hash.h>
  23 #include <quotearg.h>
  24 #include <stpcpy.h>
  25 #include <xstrtol.h>
  26
  27 #include "common.h"
  28
  29 #include <fnmatch.h>
  30
  31 static bool xheader_protected_pattern_p (char const *pattern);
  32 static bool xheader_protected_keyword_p (char const *keyword);
  33 static void xheader_set_single_keyword (char *) __attribute__ ((noreturn));
  34
  35 /* Used by xheader_finish() */
  36 static void code_string (char const *string, char const *keyword,
  37                          struct xheader *xhdr);
  38 static void extended_header_init (void);
  39
  40 /* Number of global headers written so far. */
  41 static size_t global_header_count;
  42 /* FIXME: Possibly it should be reset after changing the volume.
  43    POSIX %n specification says that it is expanded to the sequence
  44    number of current global header in *the* archive. However, for
  45    multi-volume archives this will yield duplicate header names
  46    in different volumes, which I'd like to avoid. The best way
  47    to solve this would be to use per-archive header count as required
  48    by POSIX *and* set globexthdr.name to, say,
  49    $TMPDIR/GlobalHead.%p.$NUMVOLUME.%n.
  50
  51    However it should wait until buffer.c is finally rewritten */
  52
  53 \f
  54 /* Keyword options */
  55
  56 struct keyword_list
  57 {
  58   struct keyword_list *next;
  59   char *pattern;
  60   char *value;
  61 };
  62
  63
  64 /* List of keyword patterns set by delete= option */
  65 static struct keyword_list *keyword_pattern_list;
  66
  67 /* List of keyword/value pairs set by `keyword=value' option */
  68 static struct keyword_list *keyword_global_override_list;
  69
  70 /* List of keyword/value pairs set by `keyword:=value' option */
  71 static struct keyword_list *keyword_override_list;
  72
  73 /* List of keyword/value pairs decoded from the last 'g' type header */
  74 static struct keyword_list *global_header_override_list;
  75
  76 /* Template for the name field of an 'x' type header */
  77 static char *exthdr_name;
  78
  79 /* Template for the name field of a 'g' type header */
  80 static char *globexthdr_name;
  81
  82 static bool
  83 xheader_keyword_deleted_p (const char *kw)
  84 {
  85   struct keyword_list *kp;
  86
  87   for (kp = keyword_pattern_list; kp; kp = kp->next)
  88     if (fnmatch (kp->pattern, kw, 0) == 0)
  89       return true;
  90   return false;
  91 }
  92
  93 static bool
  94 xheader_keyword_override_p (const char *keyword)
  95 {
  96   struct keyword_list *kp;
  97
  98   for (kp = keyword_override_list; kp; kp = kp->next)
  99     if (strcmp (kp->pattern, keyword) == 0)
 100       return true;
 101   return false;
 102 }
 103
 104 static void
 105 xheader_list_append (struct keyword_list **root, char const *kw,
 106                      char const *value)
 107 {
 108   struct keyword_list *kp = xmalloc (sizeof *kp);
 109   kp->pattern = xstrdup (kw);
 110   kp->value = value ? xstrdup (value) : NULL;
 111   kp->next = *root;
 112   *root = kp;
 113 }
 114
 115 static void
 116 xheader_list_destroy (struct keyword_list **root)
 117 {
 118   if (root)
 119     {
 120       struct keyword_list *kw = *root;
 121       while (kw)
 122         {
 123           struct keyword_list *next = kw->next;
 124           free (kw->pattern);
 125           free (kw->value);
 126           free (kw);
 127           kw = next;
 128         }
 129       *root = NULL;
 130     }
 131 }
 132
 133 static void
 134 xheader_set_single_keyword (char *kw)
 135 {
 136   USAGE_ERROR ((0, 0, _("Keyword %s is unknown or not yet imlemented"), kw));
 137 }
 138
 139 static void
 140 xheader_set_keyword_equal (char *kw, char *eq)
 141 {
 142   bool global = true;
 143   char *p = eq;
 144
 145   if (eq[-1] == ':')
 146     {
 147       p--;
 148       global = false;
 149     }
 150
 151   while (p > kw && isspace (*p))
 152     p--;
 153
 154   *p = 0;
 155
 156   for (p = eq + 1; *p && isspace (*p); p++)
 157     ;
 158
 159   if (strcmp (kw, "delete") == 0)
 160     {
 161       if (xheader_protected_pattern_p (p))
 162         USAGE_ERROR ((0, 0, _("Pattern %s cannot be used"), quote (p)));
 163       xheader_list_append (&keyword_pattern_list, p, NULL);
 164     }
 165   else if (strcmp (kw, "exthdr.name") == 0)
 166     assign_string (&exthdr_name, p);
 167   else if (strcmp (kw, "globexthdr.name") == 0)
 168     assign_string (&globexthdr_name, p);
 169   else
 170     {
 171       if (xheader_protected_keyword_p (kw))
 172         USAGE_ERROR ((0, 0, _("Keyword %s cannot be overridden"), kw));
 173       if (global)
 174         xheader_list_append (&keyword_global_override_list, kw, p);
 175       else
 176         xheader_list_append (&keyword_override_list, kw, p);
 177     }
 178 }
 179
 180 void
 181 xheader_set_option (char *string)
 182 {
 183   char *token;
 184   for (token = strtok (string, ","); token; token = strtok (NULL, ","))
 185     {
 186       char *p = strchr (token, '=');
 187       if (!p)
 188         xheader_set_single_keyword (token);
 189       else
 190         xheader_set_keyword_equal (token, p);
 191     }
 192 }
 193
 194 static void
 195 to_decimal (uintmax_t value, char *where, size_t size)
 196 {
 197   size_t i = 0, j;
 198
 199   where[i++] = 0;
 200   do
 201     {
 202       where[i++] = '0' + value % 10;
 203       value /= 10;
 204     }
 205   while (i < size && value);
 206   for (j = 0, i--; j < i; j++, i--)
 207     {
 208       char c = where[j];
 209       where[j] = where[i];
 210       where[i] = c;
 211     }
 212 }
 213
 214 /*
 215     string Includes:          Replaced By:
 216      %d                       The directory name of the file,
 217                               equivalent to the result of the
 218                               dirname utility on the translated
 219                               file name.
 220      %f                       The filename of the file, equivalent
 221                               to the result of the basename
 222                               utility on the translated file name.
 223      %p                       The process ID of the pax process.
 224      %%                       A '%' character. */
 225
 226 static char *
 227 xheader_format_name (struct tar_stat_info *st, const char *fmt, bool allow_n)
 228 {
 229   char *buf;
 230   size_t len = strlen (fmt);
 231   char *q;
 232   const char *p;
 233   char *dir = NULL;
 234   char *base = NULL;
 235   char pidbuf[64];
 236   char nbuf[64];
 237
 238   for (p = fmt; *p && (p = strchr (p, '%')); )
 239     {
 240       switch (p[1])
 241         {
 242         case '%':
 243           len--;
 244           break;
 245
 246         case 'd':
 247           if (st)
 248             {
 249               dir = safer_name_suffix (dir_name (st->orig_file_name),
 250                                        false, absolute_names_option);
 251               len += strlen (dir) - 1;
 252             }
 253           break;
 254
 255         case 'f':
 256           if (st)
 257             {
 258               base = base_name (st->orig_file_name);
 259               len += strlen (base) - 1;
 260             }
 261           break;
 262
 263         case 'p':
 264           to_decimal (getpid (), pidbuf, sizeof pidbuf);
 265           len += strlen (pidbuf) - 1;
 266           break;
 267
 268         case 'n':
 269           if (allow_n)
 270             {
 271               to_decimal (global_header_count + 1, pidbuf, sizeof pidbuf);
 272               len += strlen (nbuf) - 1;
 273             }
 274           break;
 275         }
 276       p++;
 277     }
 278
 279   buf = xmalloc (len + 1);
 280   for (q = buf, p = fmt; *p; )
 281     {
 282       if (*p == '%')
 283         {
 284           switch (p[1])
 285             {
 286             case '%':
 287               *q++ = *p++;
 288               p++;
 289               break;
 290
 291             case 'd':
 292               if (dir)
 293                 q = stpcpy (q, dir);
 294               p += 2;
 295               break;
 296
 297             case 'f':
 298               if (base)
 299                 q = stpcpy (q, base);
 300               p += 2;
 301               break;
 302
 303             case 'p':
 304               q = stpcpy (q, pidbuf);
 305               p += 2;
 306               break;
 307
 308             case 'n':
 309               if (allow_n)
 310                 {
 311                   q = stpcpy (q, nbuf);
 312                   p += 2;
 313                 }
 314               /* else fall through */
 315
 316             default:
 317               *q++ = *p++;
 318               if (*p)
 319                 *q++ = *p++;
 320             }
 321         }
 322       else
 323         *q++ = *p++;
 324     }
 325
 326   /* Do not allow it to end in a slash */
 327   while (q > buf && ISSLASH (q[-1]))
 328     q--;
 329   *q = 0;
 330   return buf;
 331 }
 332
 333 char *
 334 xheader_xhdr_name (struct tar_stat_info *st)
 335 {
 336   if (!exthdr_name)
 337     assign_string (&exthdr_name, "%d/PaxHeaders.%p/%f");
 338   return xheader_format_name (st, exthdr_name, false);
 339 }
 340
 341 #define GLOBAL_HEADER_TEMPLATE "/GlobalHead.%p.%n"
 342
 343 char *
 344 xheader_ghdr_name (void)
 345 {
 346   if (!globexthdr_name)
 347     {
 348       size_t len;
 349       const char *tmp = getenv ("TMPDIR");
 350       if (!tmp)
 351         tmp = "/tmp";
 352       len = strlen (tmp) + sizeof (GLOBAL_HEADER_TEMPLATE); /* Includes nul */
 353       globexthdr_name = xmalloc (len);
 354       strcpy(globexthdr_name, tmp);
 355       strcat(globexthdr_name, GLOBAL_HEADER_TEMPLATE);
 356     }
 357
 358   return xheader_format_name (NULL, globexthdr_name, true);
 359 }
 360
 361 void
 362 xheader_write (char type, char *name, struct xheader *xhdr)
 363 {
 364   union block *header;
 365   size_t size;
 366   char *p;
 367
 368   size = xhdr->size;
 369   header = start_private_header (name, size);
 370   header->header.typeflag = type;
 371
 372   simple_finish_header (header);
 373
 374   p = xhdr->buffer;
 375
 376   do
 377     {
 378       size_t len;
 379
 380       header = find_next_block ();
 381       len = BLOCKSIZE;
 382       if (len > size)
 383         len = size;
 384       memcpy (header->buffer, p, len);
 385       if (len < BLOCKSIZE)
 386         memset (header->buffer + len, 0, BLOCKSIZE - len);
 387       p += len;
 388       size -= len;
 389       set_next_block_after (header);
 390     }
 391   while (size > 0);
 392   xheader_destroy (xhdr);
 393 }
 394
 395 void
 396 xheader_write_global (void)
 397 {
 398   char *name;
 399   struct keyword_list *kp;
 400
 401   if (!keyword_global_override_list)
 402     return;
 403
 404   extended_header_init ();
 405   for (kp = keyword_global_override_list; kp; kp = kp->next)
 406     code_string (kp->value, kp->pattern, &extended_header);
 407   xheader_finish (&extended_header);
 408   xheader_write (XGLTYPE, name = xheader_ghdr_name (),
 409                  &extended_header);
 410   free (name);
 411   global_header_count++;
 412 }
 413
 414 \f
 415 /* General Interface */
 416
 417 struct xhdr_tab
 418 {
 419   char const *keyword;
 420   void (*coder) (struct tar_stat_info const *, char const *,
 421                  struct xheader *, void *data);
 422   void (*decoder) (struct tar_stat_info *, char const *);
 423   bool protect;
 424 };
 425
 426 /* This declaration must be extern, because ISO C99 section 6.9.2
 427    prohibits a tentative definition that has both internal linkage and
 428    incomplete type.  If we made it static, we'd have to declare its
 429    size which would be a maintenance pain; if we put its initializer
 430    here, we'd need a boatload of forward declarations, which would be
 431    even more of a pain.  */
 432 extern struct xhdr_tab const xhdr_tab[];
 433
 434 static struct xhdr_tab const *
 435 locate_handler (char const *keyword)
 436 {
 437   struct xhdr_tab const *p;
 438
 439   for (p = xhdr_tab; p->keyword; p++)
 440     if (strcmp (p->keyword, keyword) == 0)
 441       return p;
 442   return NULL;
 443 }
 444
 445 static bool
 446 xheader_protected_pattern_p (const char *pattern)
 447 {
 448   struct xhdr_tab const *p;
 449
 450   for (p = xhdr_tab; p->keyword; p++)
 451     if (p->protect && fnmatch (pattern, p->keyword, 0) == 0)
 452       return true;
 453   return false;
 454 }
 455
 456 static bool
 457 xheader_protected_keyword_p (const char *keyword)
 458 {
 459   struct xhdr_tab const *p;
 460
 461   for (p = xhdr_tab; p->keyword; p++)
 462     if (p->protect && strcmp (p->keyword, keyword) == 0)
 463       return true;
 464   return false;
 465 }
 466
 467 /* Decode a single extended header record, advancing *PTR to the next record.
 468    Return true on success, false otherwise.  */
 469 static bool
 470 decode_record (char **ptr,
 471                void (*handler) (void *, char const *, char const *),
 472                void *data)
 473 {
 474   char *start = *ptr;
 475   char *p = start;
 476   unsigned long int len;
 477   char *len_lim;
 478   char const *keyword;
 479   char *nextp;
 480   size_t len_max = extended_header.buffer + extended_header.size - start;
 481
 482   while (*p == ' ' || *p == '\t')
 483     p++;
 484
 485   if (! ISDIGIT (*p))
 486     {
 487       if (*p)
 488         ERROR ((0, 0, _("Malformed extended header: missing length")));
 489       return false;
 490     }
 491
 492   errno = 0;
 493   len = strtoul (p, &len_lim, 10);
 494
 495   if (len_max < len || (len == ULONG_MAX && errno == ERANGE))
 496     {
 497       ERROR ((0, 0, _("Malformed extended header: length out of range")));
 498       return false;
 499     }
 500
 501   nextp = start + len;
 502
 503   for (p = len_lim; *p == ' ' || *p == '\t'; p++)
 504     continue;
 505   if (p == len_lim)
 506     {
 507       ERROR ((0, 0,
 508               _("Malformed extended header: missing blank after length")));
 509       return false;
 510     }
 511
 512   keyword = p;
 513   p = strchr (p, '=');
 514   if (! (p && p < nextp))
 515     {
 516       ERROR ((0, 0, _("Malformed extended header: missing equal sign")));
 517       return false;
 518     }
 519
 520   if (nextp[-1] != '\n')
 521     {
 522       ERROR ((0, 0, _("Malformed extended header: missing newline")));
 523       return false;
 524     }
 525
 526   *p = nextp[-1] = '\0';
 527   handler (data, keyword, p + 1);
 528   *p = '=';
 529   nextp[-1] = '\n';
 530   *ptr = nextp;
 531   return true;
 532 }
 533
 534 static void
 535 run_override_list (struct keyword_list *kp, struct tar_stat_info *st)
 536 {
 537   for (; kp; kp = kp->next)
 538     {
 539       struct xhdr_tab const *t = locate_handler (kp->pattern);
 540       if (t)
 541         t->decoder (st, kp->value);
 542     }
 543 }
 544
 545 static void
 546 decx (void *data, char const *keyword, char const *value)
 547 {
 548   struct xhdr_tab const *t;
 549   struct tar_stat_info *st = data;
 550
 551   if (xheader_keyword_deleted_p (keyword)
 552       || xheader_keyword_override_p (keyword))
 553     return;
 554
 555   t = locate_handler (keyword);
 556   if (t)
 557     t->decoder (st, value);
 558 }
 559
 560 void
 561 xheader_decode (struct tar_stat_info *st)
 562 {
 563   run_override_list (keyword_global_override_list, st);
 564   run_override_list (global_header_override_list, st);
 565
 566   if (extended_header.size)
 567     {
 568       char *p = extended_header.buffer + BLOCKSIZE;
 569       while (decode_record (&p, decx, st))
 570         continue;
 571     }
 572   run_override_list (keyword_override_list, st);
 573 }
 574
 575 static void
 576 decg (void *data, char const *keyword, char const *value)
 577 {
 578   struct keyword_list **kwl = data;
 579   xheader_list_append (kwl, keyword, value);
 580 }
 581
 582 void
 583 xheader_decode_global (void)
 584 {
 585   if (extended_header.size)
 586     {
 587       char *p = extended_header.buffer + BLOCKSIZE;
 588
 589       xheader_list_destroy (&global_header_override_list);
 590       while (decode_record (&p, decg, &global_header_override_list))
 591         continue;
 592     }
 593 }
 594
 595 static void
 596 extended_header_init (void)
 597 {
 598   if (!extended_header.stk)
 599     {
 600       extended_header.stk = xmalloc (sizeof *extended_header.stk);
 601       obstack_init (extended_header.stk);
 602     }
 603 }
 604
 605 void
 606 xheader_store (char const *keyword, struct tar_stat_info const *st, void *data)
 607 {
 608   struct xhdr_tab const *t;
 609
 610   if (extended_header.buffer)
 611     return;
 612   t = locate_handler (keyword);
 613   if (!t)
 614     return;
 615   if (xheader_keyword_deleted_p (keyword)
 616       || xheader_keyword_override_p (keyword))
 617     return;
 618   extended_header_init ();
 619   t->coder (st, keyword, &extended_header, data);
 620 }
 621
 622 void
 623 xheader_read (union block *p, size_t size)
 624 {
 625   size_t j = 0;
 626   size_t nblocks;
 627
 628   free (extended_header.buffer);
 629   size += BLOCKSIZE;
 630   extended_header.size = size;
 631   nblocks = (size + BLOCKSIZE - 1) / BLOCKSIZE;
 632   extended_header.buffer = xmalloc (size + 1);
 633   extended_header.buffer[size] = '\0';
 634
 635   do
 636     {
 637       size_t len = size;
 638
 639       if (len > BLOCKSIZE)
 640         len = BLOCKSIZE;
 641
 642       memcpy (&extended_header.buffer[j], p->buffer, len);
 643       set_next_block_after (p);
 644
 645       p = find_next_block ();
 646
 647       j += len;
 648       size -= len;
 649     }
 650   while (size > 0);
 651 }
 652
 653 static size_t
 654 format_uintmax (uintmax_t val, char *buf, size_t s)
 655 {
 656   if (!buf)
 657     {
 658       s = 0;
 659       do
 660         s++;
 661       while ((val /= 10) != 0);
 662     }
 663   else
 664     {
 665       char *p = buf + s - 1;
 666
 667       do
 668         {
 669           *p-- = val % 10 + '0';
 670         }
 671       while ((val /= 10) != 0);
 672
 673       while (p >= buf)
 674         *p-- = '0';
 675     }
 676   return s;
 677 }
 678
 679 static void
 680 xheader_print (struct xheader *xhdr, char const *keyword, char const *value)
 681 {
 682   size_t len = strlen (keyword) + strlen (value) + 3; /* ' ' + '=' + '\n' */
 683   size_t p, n = 0;
 684   char nbuf[100];
 685
 686   do
 687     {
 688       p = n;
 689       n = format_uintmax (len + p, NULL, 0);
 690     }
 691   while (n != p);
 692
 693   format_uintmax (len + n, nbuf, n);
 694   obstack_grow (xhdr->stk, nbuf, n);
 695   obstack_1grow (xhdr->stk, ' ');
 696   obstack_grow (xhdr->stk, keyword, strlen (keyword));
 697   obstack_1grow (xhdr->stk, '=');
 698   obstack_grow (xhdr->stk, value, strlen (value));
 699   obstack_1grow (xhdr->stk, '\n');
 700 }
 701
 702 void
 703 xheader_finish (struct xheader *xhdr)
 704 {
 705   struct keyword_list *kp;
 706
 707   for (kp = keyword_override_list; kp; kp = kp->next)
 708     code_string (kp->value, kp->pattern, xhdr);
 709
 710   obstack_1grow (xhdr->stk, 0);
 711   xhdr->buffer = obstack_finish (xhdr->stk);
 712   xhdr->size = strlen (xhdr->buffer);
 713 }
 714
 715 void
 716 xheader_destroy (struct xheader *xhdr)
 717 {
 718   if (xhdr->stk)
 719     {
 720       obstack_free (xhdr->stk, NULL);
 721       free (xhdr->stk);
 722       xhdr->stk = NULL;
 723     }
 724   else
 725     free (xhdr->buffer);
 726   xhdr->buffer = 0;
 727   xhdr->size = 0;
 728 }
 729
 730 \f
 731 /* Implementations */
 732 static void
 733 code_string (char const *string, char const *keyword, struct xheader *xhdr)
 734 {
 735   char *outstr;
 736   if (!utf8_convert (true, string, &outstr))
 737     {
 738       /* FIXME: report error */
 739       outstr = xstrdup (string);
 740     }
 741   xheader_print (xhdr, keyword, outstr);
 742   free (outstr);
 743 }
 744
 745 static void
 746 decode_string (char **string, char const *arg)
 747 {
 748   if (*string)
 749     {
 750       free (*string);
 751       *string = NULL;
 752     }
 753   if (!utf8_convert (false, arg, string))
 754     {
 755       /* FIXME: report error and act accordingly to --pax invalid=UTF-8 */
 756       assign_string (string, arg);
 757     }
 758 }
 759
 760 static void
 761 code_time (time_t t, unsigned long nano,
 762            char const *keyword, struct xheader *xhdr)
 763 {
 764   char sbuf[200];
 765   size_t s = format_uintmax (t, NULL, 0);
 766   if (s + 11 >= sizeof sbuf)
 767     return;
 768   format_uintmax (t, sbuf, s);
 769   sbuf[s++] = '.';
 770   s += format_uintmax (nano, sbuf + s, 9);
 771   sbuf[s] = 0;
 772   xheader_print (xhdr, keyword, sbuf);
 773 }
 774
 775 static void
 776 decode_time (char const *arg, time_t *secs, unsigned long *nsecs)
 777 {
 778   uintmax_t u;
 779   char *p;
 780   if (xstrtoumax (arg, &p, 10, &u, "") == LONGINT_OK)
 781     {
 782       *secs = u;
 783       if (*p == '.' && xstrtoumax (p+1, NULL, 10, &u, "") == LONGINT_OK)
 784         *nsecs = u;
 785     }
 786 }
 787
 788 static void
 789 code_num (uintmax_t value, char const *keyword, struct xheader *xhdr)
 790 {
 791   char sbuf[100];
 792   size_t s = format_uintmax (value, NULL, 0);
 793   format_uintmax (value, sbuf, s);
 794   sbuf[s] = 0;
 795   xheader_print (xhdr, keyword, sbuf);
 796 }
 797
 798 static void
 799 dummy_coder (struct tar_stat_info const *st __attribute__ ((unused)),
 800              char const *keyword __attribute__ ((unused)),
 801              struct xheader *xhdr __attribute__ ((unused)),
 802              void *data __attribute__ ((unused)))
 803 {
 804 }
 805
 806 static void
 807 dummy_decoder (struct tar_stat_info *st __attribute__ ((unused)),
 808                char const *arg __attribute__ ((unused)))
 809 {
 810 }
 811
 812 static void
 813 atime_coder (struct tar_stat_info const *st, char const *keyword,
 814              struct xheader *xhdr, void *data __attribute__ ((unused)))
 815 {
 816   code_time (st->stat.st_atime, st->atime_nsec, keyword, xhdr);
 817 }
 818
 819 static void
 820 atime_decoder (struct tar_stat_info *st, char const *arg)
 821 {
 822   decode_time (arg, &st->stat.st_atime, &st->atime_nsec);
 823 }
 824
 825 static void
 826 gid_coder (struct tar_stat_info const *st, char const *keyword,
 827            struct xheader *xhdr, void *data __attribute__ ((unused)))
 828 {
 829   code_num (st->stat.st_gid, keyword, xhdr);
 830 }
 831
 832 static void
 833 gid_decoder (struct tar_stat_info *st, char const *arg)
 834 {
 835   uintmax_t u;
 836   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
 837     st->stat.st_gid = u;
 838 }
 839
 840 static void
 841 gname_coder (struct tar_stat_info const *st, char const *keyword,
 842              struct xheader *xhdr, void *data __attribute__ ((unused)))
 843 {
 844   code_string (st->gname, keyword, xhdr);
 845 }
 846
 847 static void
 848 gname_decoder (struct tar_stat_info *st, char const *arg)
 849 {
 850   decode_string (&st->gname, arg);
 851 }
 852
 853 static void
 854 linkpath_coder (struct tar_stat_info const *st, char const *keyword,
 855                 struct xheader *xhdr, void *data __attribute__ ((unused)))
 856 {
 857   code_string (st->link_name, keyword, xhdr);
 858 }
 859
 860 static void
 861 linkpath_decoder (struct tar_stat_info *st, char const *arg)
 862 {
 863   decode_string (&st->link_name, arg);
 864 }
 865
 866 static void
 867 ctime_coder (struct tar_stat_info const *st, char const *keyword,
 868              struct xheader *xhdr, void *data __attribute__ ((unused)))
 869 {
 870   code_time (st->stat.st_ctime, st->ctime_nsec, keyword, xhdr);
 871 }
 872
 873 static void
 874 ctime_decoder (struct tar_stat_info *st, char const *arg)
 875 {
 876   decode_time (arg, &st->stat.st_ctime, &st->ctime_nsec);
 877 }
 878
 879 static void
 880 mtime_coder (struct tar_stat_info const *st, char const *keyword,
 881              struct xheader *xhdr, void *data __attribute__ ((unused)))
 882 {
 883   code_time (st->stat.st_mtime, st->mtime_nsec, keyword, xhdr);
 884 }
 885
 886 static void
 887 mtime_decoder (struct tar_stat_info *st, char const *arg)
 888 {
 889   decode_time (arg, &st->stat.st_mtime, &st->mtime_nsec);
 890 }
 891
 892 static void
 893 path_coder (struct tar_stat_info const *st, char const *keyword,
 894             struct xheader *xhdr, void *data __attribute__ ((unused)))
 895 {
 896   code_string (st->file_name, keyword, xhdr);
 897 }
 898
 899 static void
 900 path_decoder (struct tar_stat_info *st, char const *arg)
 901 {
 902   decode_string (&st->orig_file_name, arg);
 903   decode_string (&st->file_name, arg);
 904   st->had_trailing_slash = strip_trailing_slashes (st->file_name);
 905 }
 906
 907 static void
 908 size_coder (struct tar_stat_info const *st, char const *keyword,
 909             struct xheader *xhdr, void *data __attribute__ ((unused)))
 910 {
 911   code_num (st->stat.st_size, keyword, xhdr);
 912 }
 913
 914 static void
 915 size_decoder (struct tar_stat_info *st, char const *arg)
 916 {
 917   uintmax_t u;
 918   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
 919     st->archive_file_size = st->stat.st_size = u;
 920 }
 921
 922 static void
 923 uid_coder (struct tar_stat_info const *st, char const *keyword,
 924            struct xheader *xhdr, void *data __attribute__ ((unused)))
 925 {
 926   code_num (st->stat.st_uid, keyword, xhdr);
 927 }
 928
 929 static void
 930 uid_decoder (struct tar_stat_info *st, char const *arg)
 931 {
 932   uintmax_t u;
 933   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
 934     st->stat.st_uid = u;
 935 }
 936
 937 static void
 938 uname_coder (struct tar_stat_info const *st, char const *keyword,
 939              struct xheader *xhdr, void *data __attribute__ ((unused)))
 940 {
 941   code_string (st->uname, keyword, xhdr);
 942 }
 943
 944 static void
 945 uname_decoder (struct tar_stat_info *st, char const *arg)
 946 {
 947   decode_string (&st->uname, arg);
 948 }
 949
 950 static void
 951 sparse_size_coder (struct tar_stat_info const *st, char const *keyword,
 952              struct xheader *xhdr, void *data)
 953 {
 954   size_coder (st, keyword, xhdr, data);
 955 }
 956
 957 static void
 958 sparse_size_decoder (struct tar_stat_info *st, char const *arg)
 959 {
 960   uintmax_t u;
 961   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
 962     st->stat.st_size = u;
 963 }
 964
 965 static void
 966 sparse_numblocks_coder (struct tar_stat_info const *st, char const *keyword,
 967                         struct xheader *xhdr,
 968                         void *data __attribute__ ((unused)))
 969 {
 970   code_num (st->sparse_map_avail, keyword, xhdr);
 971 }
 972
 973 static void
 974 sparse_numblocks_decoder (struct tar_stat_info *st, char const *arg)
 975 {
 976   uintmax_t u;
 977   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
 978     {
 979       st->sparse_map_size = u;
 980       st->sparse_map = calloc(st->sparse_map_size, sizeof(st->sparse_map[0]));
 981       st->sparse_map_avail = 0;
 982     }
 983 }
 984
 985 static void
 986 sparse_offset_coder (struct tar_stat_info const *st, char const *keyword,
 987                      struct xheader *xhdr, void *data)
 988 {
 989   size_t i = *(size_t*)data;
 990   code_num (st->sparse_map[i].offset, keyword, xhdr);
 991 }
 992
 993 static void
 994 sparse_offset_decoder (struct tar_stat_info *st, char const *arg)
 995 {
 996   uintmax_t u;
 997   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
 998     st->sparse_map[st->sparse_map_avail].offset = u;
 999 }
1000
1001 static void
1002 sparse_numbytes_coder (struct tar_stat_info const *st, char const *keyword,
1003                      struct xheader *xhdr, void *data)
1004 {
1005   size_t i = *(size_t*)data;
1006   code_num (st->sparse_map[i].numbytes, keyword, xhdr);
1007 }
1008
1009 static void
1010 sparse_numbytes_decoder (struct tar_stat_info *st, char const *arg)
1011 {
1012   uintmax_t u;
1013   if (xstrtoumax (arg, NULL, 10, &u, "") == LONGINT_OK)
1014     {
1015       if (st->sparse_map_avail == st->sparse_map_size)
1016         {
1017           st->sparse_map_size *= 2;
1018           st->sparse_map = xrealloc (st->sparse_map,
1019                                      st->sparse_map_size
1020                                      * sizeof st->sparse_map[0]);
1021         }
1022       st->sparse_map[st->sparse_map_avail++].numbytes = u;
1023     }
1024 }
1025
1026 struct xhdr_tab const xhdr_tab[] = {
1027   { "atime",    atime_coder,    atime_decoder,    false },
1028   { "comment",  dummy_coder,    dummy_decoder,    false },
1029   { "charset",  dummy_coder,    dummy_decoder,    false },
1030   { "ctime",    ctime_coder,    ctime_decoder,    false },
1031   { "gid",      gid_coder,      gid_decoder,      false },
1032   { "gname",    gname_coder,    gname_decoder,    false },
1033   { "linkpath", linkpath_coder, linkpath_decoder, false },
1034   { "mtime",    mtime_coder,    mtime_decoder,    false },
1035   { "path",     path_coder,     path_decoder,     false },
1036   { "size",     size_coder,     size_decoder,     false },
1037   { "uid",      uid_coder,      uid_decoder,      false },
1038   { "uname",    uname_coder,    uname_decoder,    false },
1039
1040   /* Sparse file handling */
1041   { "GNU.sparse.size",       sparse_size_coder, sparse_size_decoder, true },
1042   { "GNU.sparse.numblocks",  sparse_numblocks_coder, sparse_numblocks_decoder,
1043     true },
1044   { "GNU.sparse.offset",     sparse_offset_coder, sparse_offset_decoder,
1045     true },
1046   { "GNU.sparse.numbytes",   sparse_numbytes_coder, sparse_numbytes_decoder,
1047     true },
1048
1049 #if 0 /* GNU private keywords (not yet implemented) */
1050
1051   /* The next directory entry actually contains the names of files
1052      that were in the directory at the time the dump was made.
1053      Supersedes GNUTYPE_DUMPDIR header type.  */
1054   { "GNU.dump.name",  dump_name_coder, dump_name_decoder, false },
1055   { "GNU.dump.status", dump_status_coder, dump_status_decoder, false },
1056
1057   /* Keeps the tape/volume header. May be present only in the global headers.
1058      Equivalent to GNUTYPE_VOLHDR.  */
1059   { "GNU.volume.header", volume_header_coder, volume_header_decoder, false },
1060
1061   /* These may be present in a first global header of the archive.
1062      They provide the same functionality as GNUTYPE_MULTIVOL header.
1063      The GNU.volume.size keeps the real_s_sizeleft value, which is
1064      otherwise kept in the size field of a multivolume header.  The
1065      GNU.volume.offset keeps the offset of the start of this volume,
1066      otherwise kept in oldgnu_header.offset.  */
1067   { "GNU.volume.size", volume_size_coder, volume_size_decoder, false },
1068   { "GNU.volume.offset", volume_offset_coder, volume_offset_decoder, false },
1069 #endif
1070
1071   { NULL, NULL, NULL, false }
1072 };