contrib/libarchive/libarchive/archive_write_set_format_shar.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * Copyright (c) 2008 Joerg Sonnenberger
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_shar.c 189438 2009-03-06 05:58:56Z kientzle $");
  29
  30 #ifdef HAVE_ERRNO_H
  31 #include <errno.h>
  32 #endif
  33 #include <stdio.h>
  34 #ifdef HAVE_STDLIB_H
  35 #include <stdlib.h>
  36 #endif
  37 #ifdef HAVE_STRING_H
  38 #include <string.h>
  39 #endif
  40
  41 #include "archive.h"
  42 #include "archive_entry.h"
  43 #include "archive_private.h"
  44 #include "archive_write_private.h"
  45
  46 struct shar {
  47         int                      dump;
  48         int                      end_of_line;
  49         struct archive_entry    *entry;
  50         int                      has_data;
  51         char                    *last_dir;
  52
  53         /* Line buffer for uuencoded dump format */
  54         char                     outbuff[45];
  55         size_t                   outpos;
  56
  57         int                      wrote_header;
  58         struct archive_string    work;
  59         struct archive_string    quoted_name;
  60 };
  61
  62 static int      archive_write_shar_close(struct archive_write *);
  63 static int      archive_write_shar_free(struct archive_write *);
  64 static int      archive_write_shar_header(struct archive_write *,
  65                     struct archive_entry *);
  66 static ssize_t  archive_write_shar_data_sed(struct archive_write *,
  67                     const void * buff, size_t);
  68 static ssize_t  archive_write_shar_data_uuencode(struct archive_write *,
  69                     const void * buff, size_t);
  70 static int      archive_write_shar_finish_entry(struct archive_write *);
  71
  72 /*
  73  * Copy the given string to the buffer, quoting all shell meta characters
  74  * found.
  75  */
  76 static void
  77 shar_quote(struct archive_string *buf, const char *str, int in_shell)
  78 {
  79         static const char meta[] = "\n \t'`\";&<>()|*?{}[]\\$!#^~";
  80         size_t len;
  81
  82         while (*str != '\0') {
  83                 if ((len = strcspn(str, meta)) != 0) {
  84                         archive_strncat(buf, str, len);
  85                         str += len;
  86                 } else if (*str == '\n') {
  87                         if (in_shell)
  88                                 archive_strcat(buf, "\"\n\"");
  89                         else
  90                                 archive_strcat(buf, "\\n");
  91                         ++str;
  92                 } else {
  93                         archive_strappend_char(buf, '\\');
  94                         archive_strappend_char(buf, *str);
  95                         ++str;
  96                 }
  97         }
  98 }
  99
 100 /*
 101  * Set output format to 'shar' format.
 102  */
 103 int
 104 archive_write_set_format_shar(struct archive *_a)
 105 {
 106         struct archive_write *a = (struct archive_write *)_a;
 107         struct shar *shar;
 108
 109         archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
 110             ARCHIVE_STATE_NEW, "archive_write_set_format_shar");
 111
 112         /* If someone else was already registered, unregister them. */
 113         if (a->format_free != NULL)
 114                 (a->format_free)(a);
 115
 116         shar = (struct shar *)malloc(sizeof(*shar));
 117         if (shar == NULL) {
 118                 archive_set_error(&a->archive, ENOMEM, "Can't allocate shar data");
 119                 return (ARCHIVE_FATAL);
 120         }
 121         memset(shar, 0, sizeof(*shar));
 122         archive_string_init(&shar->work);
 123         archive_string_init(&shar->quoted_name);
 124         a->format_data = shar;
 125         a->format_name = "shar";
 126         a->format_write_header = archive_write_shar_header;
 127         a->format_close = archive_write_shar_close;
 128         a->format_free = archive_write_shar_free;
 129         a->format_write_data = archive_write_shar_data_sed;
 130         a->format_finish_entry = archive_write_shar_finish_entry;
 131         a->archive.archive_format = ARCHIVE_FORMAT_SHAR_BASE;
 132         a->archive.archive_format_name = "shar";
 133         return (ARCHIVE_OK);
 134 }
 135
 136 /*
 137  * An alternate 'shar' that uses uudecode instead of 'sed' to encode
 138  * file contents and can therefore be used to archive binary files.
 139  * In addition, this variant also attempts to restore ownership, file modes,
 140  * and other extended file information.
 141  */
 142 int
 143 archive_write_set_format_shar_dump(struct archive *_a)
 144 {
 145         struct archive_write *a = (struct archive_write *)_a;
 146         struct shar *shar;
 147
 148         archive_write_set_format_shar(&a->archive);
 149         shar = (struct shar *)a->format_data;
 150         shar->dump = 1;
 151         a->format_write_data = archive_write_shar_data_uuencode;
 152         a->archive.archive_format = ARCHIVE_FORMAT_SHAR_DUMP;
 153         a->archive.archive_format_name = "shar dump";
 154         return (ARCHIVE_OK);
 155 }
 156
 157 static int
 158 archive_write_shar_header(struct archive_write *a, struct archive_entry *entry)
 159 {
 160         const char *linkname;
 161         const char *name;
 162         char *p, *pp;
 163         struct shar *shar;
 164
 165         shar = (struct shar *)a->format_data;
 166         if (!shar->wrote_header) {
 167                 archive_strcat(&shar->work, "#!/bin/sh\n");
 168                 archive_strcat(&shar->work, "# This is a shell archive\n");
 169                 shar->wrote_header = 1;
 170         }
 171
 172         /* Save the entry for the closing. */
 173         if (shar->entry)
 174                 archive_entry_free(shar->entry);
 175         shar->entry = archive_entry_clone(entry);
 176         name = archive_entry_pathname(entry);
 177
 178         /* Handle some preparatory issues. */
 179         switch(archive_entry_filetype(entry)) {
 180         case AE_IFREG:
 181                 /* Only regular files have non-zero size. */
 182                 break;
 183         case AE_IFDIR:
 184                 archive_entry_set_size(entry, 0);
 185                 /* Don't bother trying to recreate '.' */
 186                 if (strcmp(name, ".") == 0  ||  strcmp(name, "./") == 0)
 187                         return (ARCHIVE_OK);
 188                 break;
 189         case AE_IFIFO:
 190         case AE_IFCHR:
 191         case AE_IFBLK:
 192                 /* All other file types have zero size in the archive. */
 193                 archive_entry_set_size(entry, 0);
 194                 break;
 195         default:
 196                 archive_entry_set_size(entry, 0);
 197                 if (archive_entry_hardlink(entry) == NULL &&
 198                     archive_entry_symlink(entry) == NULL) {
 199                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 200                             "shar format cannot archive this");
 201                         return (ARCHIVE_WARN);
 202                 }
 203         }
 204
 205         archive_string_empty(&shar->quoted_name);
 206         shar_quote(&shar->quoted_name, name, 1);
 207
 208         /* Stock preparation for all file types. */
 209         archive_string_sprintf(&shar->work, "echo x %s\n", shar->quoted_name.s);
 210
 211         if (archive_entry_filetype(entry) != AE_IFDIR) {
 212                 /* Try to create the dir. */
 213                 p = strdup(name);
 214                 pp = strrchr(p, '/');
 215                 /* If there is a / character, try to create the dir. */
 216                 if (pp != NULL) {
 217                         *pp = '\0';
 218
 219                         /* Try to avoid a lot of redundant mkdir commands. */
 220                         if (strcmp(p, ".") == 0) {
 221                                 /* Don't try to "mkdir ." */
 222                                 free(p);
 223                         } else if (shar->last_dir == NULL) {
 224                                 archive_strcat(&shar->work, "mkdir -p ");
 225                                 shar_quote(&shar->work, p, 1);
 226                                 archive_strcat(&shar->work,
 227                                     " > /dev/null 2>&1\n");
 228                                 shar->last_dir = p;
 229                         } else if (strcmp(p, shar->last_dir) == 0) {
 230                                 /* We've already created this exact dir. */
 231                                 free(p);
 232                         } else if (strlen(p) < strlen(shar->last_dir) &&
 233                             strncmp(p, shar->last_dir, strlen(p)) == 0) {
 234                                 /* We've already created a subdir. */
 235                                 free(p);
 236                         } else {
 237                                 archive_strcat(&shar->work, "mkdir -p ");
 238                                 shar_quote(&shar->work, p, 1);
 239                                 archive_strcat(&shar->work,
 240                                     " > /dev/null 2>&1\n");
 241                                 shar->last_dir = p;
 242                         }
 243                 } else {
 244                         free(p);
 245                 }
 246         }
 247
 248         /* Handle file-type specific issues. */
 249         shar->has_data = 0;
 250         if ((linkname = archive_entry_hardlink(entry)) != NULL) {
 251                 archive_strcat(&shar->work, "ln -f ");
 252                 shar_quote(&shar->work, linkname, 1);
 253                 archive_string_sprintf(&shar->work, " %s\n",
 254                     shar->quoted_name.s);
 255         } else if ((linkname = archive_entry_symlink(entry)) != NULL) {
 256                 archive_strcat(&shar->work, "ln -fs ");
 257                 shar_quote(&shar->work, linkname, 1);
 258                 archive_string_sprintf(&shar->work, " %s\n",
 259                     shar->quoted_name.s);
 260         } else {
 261                 switch(archive_entry_filetype(entry)) {
 262                 case AE_IFREG:
 263                         if (archive_entry_size(entry) == 0) {
 264                                 /* More portable than "touch." */
 265                                 archive_string_sprintf(&shar->work,
 266                                     "test -e \"%s\" || :> \"%s\"\n",
 267                                     shar->quoted_name.s, shar->quoted_name.s);
 268                         } else {
 269                                 if (shar->dump) {
 270                                         unsigned int mode = archive_entry_mode(entry) & 0777;
 271                                         archive_string_sprintf(&shar->work,
 272                                             "uudecode -p > %s << 'SHAR_END'\n",
 273                                             shar->quoted_name.s);
 274                                         archive_string_sprintf(&shar->work,
 275                                             "begin %o ", mode);
 276                                         shar_quote(&shar->work, name, 0);
 277                                         archive_strcat(&shar->work, "\n");
 278                                 } else {
 279                                         archive_string_sprintf(&shar->work,
 280                                             "sed 's/^X//' > %s << 'SHAR_END'\n",
 281                                             shar->quoted_name.s);
 282                                 }
 283                                 shar->has_data = 1;
 284                                 shar->end_of_line = 1;
 285                                 shar->outpos = 0;
 286                         }
 287                         break;
 288                 case AE_IFDIR:
 289                         archive_string_sprintf(&shar->work,
 290                             "mkdir -p %s > /dev/null 2>&1\n",
 291                             shar->quoted_name.s);
 292                         /* Record that we just created this directory. */
 293                         if (shar->last_dir != NULL)
 294                                 free(shar->last_dir);
 295
 296                         shar->last_dir = strdup(name);
 297                         /* Trim a trailing '/'. */
 298                         pp = strrchr(shar->last_dir, '/');
 299                         if (pp != NULL && pp[1] == '\0')
 300                                 *pp = '\0';
 301                         /*
 302                          * TODO: Put dir name/mode on a list to be fixed
 303                          * up at end of archive.
 304                          */
 305                         break;
 306                 case AE_IFIFO:
 307                         archive_string_sprintf(&shar->work,
 308                             "mkfifo %s\n", shar->quoted_name.s);
 309                         break;
 310                 case AE_IFCHR:
 311                         archive_string_sprintf(&shar->work,
 312                             "mknod %s c %ju %ju\n", shar->quoted_name.s,
 313                             (uintmax_t)archive_entry_rdevmajor(entry),
 314                             (uintmax_t)archive_entry_rdevminor(entry));
 315                         break;
 316                 case AE_IFBLK:
 317                         archive_string_sprintf(&shar->work,
 318                             "mknod %s b %ju %ju\n", shar->quoted_name.s,
 319                             (uintmax_t)archive_entry_rdevmajor(entry),
 320                             (uintmax_t)archive_entry_rdevminor(entry));
 321                         break;
 322                 default:
 323                         return (ARCHIVE_WARN);
 324                 }
 325         }
 326
 327         return (ARCHIVE_OK);
 328 }
 329
 330 static ssize_t
 331 archive_write_shar_data_sed(struct archive_write *a, const void *buff, size_t n)
 332 {
 333         static const size_t ensured = 65533;
 334         struct shar *shar;
 335         const char *src;
 336         char *buf, *buf_end;
 337         int ret;
 338         size_t written = n;
 339
 340         shar = (struct shar *)a->format_data;
 341         if (!shar->has_data || n == 0)
 342                 return (0);
 343
 344         src = (const char *)buff;
 345
 346         /*
 347          * ensure is the number of bytes in buffer before expanding the
 348          * current character.  Each operation writes the current character
 349          * and optionally the start-of-new-line marker.  This can happen
 350          * twice before entering the loop, so make sure three additional
 351          * bytes can be written.
 352          */
 353         if (archive_string_ensure(&shar->work, ensured + 3) == NULL) {
 354                 archive_set_error(&a->archive, ENOMEM, "Out of memory");
 355                 return (ARCHIVE_FATAL);
 356         }
 357
 358         if (shar->work.length > ensured) {
 359                 ret = __archive_write_output(a, shar->work.s,
 360                     shar->work.length);
 361                 if (ret != ARCHIVE_OK)
 362                         return (ARCHIVE_FATAL);
 363                 archive_string_empty(&shar->work);
 364         }
 365         buf = shar->work.s + shar->work.length;
 366         buf_end = shar->work.s + ensured;
 367
 368         if (shar->end_of_line) {
 369                 *buf++ = 'X';
 370                 shar->end_of_line = 0;
 371         }
 372
 373         while (n-- != 0) {
 374                 if ((*buf++ = *src++) == '\n') {
 375                         if (n == 0)
 376                                 shar->end_of_line = 1;
 377                         else
 378                                 *buf++ = 'X';
 379                 }
 380
 381                 if (buf >= buf_end) {
 382                         shar->work.length = buf - shar->work.s;
 383                         ret = __archive_write_output(a, shar->work.s,
 384                             shar->work.length);
 385                         if (ret != ARCHIVE_OK)
 386                                 return (ARCHIVE_FATAL);
 387                         archive_string_empty(&shar->work);
 388                         buf = shar->work.s;
 389                 }
 390         }
 391
 392         shar->work.length = buf - shar->work.s;
 393
 394         return (written);
 395 }
 396
 397 #define UUENC(c)        (((c)!=0) ? ((c) & 077) + ' ': '`')
 398
 399 static void
 400 uuencode_group(const char _in[3], char out[4])
 401 {
 402         const unsigned char *in = (const unsigned char *)_in;
 403         int t;
 404
 405         t = (in[0] << 16) | (in[1] << 8) | in[2];
 406         out[0] = UUENC( 0x3f & (t >> 18) );
 407         out[1] = UUENC( 0x3f & (t >> 12) );
 408         out[2] = UUENC( 0x3f & (t >> 6) );
 409         out[3] = UUENC( 0x3f & t );
 410 }
 411
 412 static int
 413 _uuencode_line(struct archive_write *a, struct shar *shar, const char *inbuf, size_t len)
 414 {
 415         char *buf;
 416         size_t alloc_len;
 417
 418         /* len <= 45 -> expanded to 60 + len byte + new line */
 419         alloc_len = shar->work.length + 62;
 420         if (archive_string_ensure(&shar->work, alloc_len) == NULL) {
 421                 archive_set_error(&a->archive, ENOMEM, "Out of memory");
 422                 return (ARCHIVE_FATAL);
 423         }
 424
 425         buf = shar->work.s + shar->work.length;
 426         *buf++ = UUENC(len);
 427         while (len >= 3) {
 428                 uuencode_group(inbuf, buf);
 429                 len -= 3;
 430                 inbuf += 3;
 431                 buf += 4;
 432         }
 433         if (len != 0) {
 434                 char tmp_buf[3];
 435                 tmp_buf[0] = inbuf[0];
 436                 if (len == 1)
 437                         tmp_buf[1] = '\0';
 438                 else
 439                         tmp_buf[1] = inbuf[1];
 440                 tmp_buf[2] = '\0';
 441                 uuencode_group(tmp_buf, buf);
 442                 buf += 4;
 443         }
 444         *buf++ = '\n';
 445         if ((buf - shar->work.s) > (ptrdiff_t)(shar->work.length + 62)) {
 446                 archive_set_error(&a->archive,
 447                     ARCHIVE_ERRNO_MISC, "Buffer overflow");
 448                 return (ARCHIVE_FATAL);
 449         }
 450         shar->work.length = buf - shar->work.s;
 451         return (ARCHIVE_OK);
 452 }
 453
 454 #define uuencode_line(__a, __shar, __inbuf, __len) \
 455         do { \
 456                 int r = _uuencode_line(__a, __shar, __inbuf, __len); \
 457                 if (r != ARCHIVE_OK) \
 458                         return (ARCHIVE_FATAL); \
 459         } while (0)
 460
 461 static ssize_t
 462 archive_write_shar_data_uuencode(struct archive_write *a, const void *buff,
 463     size_t length)
 464 {
 465         struct shar *shar;
 466         const char *src;
 467         size_t n;
 468         int ret;
 469
 470         shar = (struct shar *)a->format_data;
 471         if (!shar->has_data)
 472                 return (ARCHIVE_OK);
 473         src = (const char *)buff;
 474
 475         if (shar->outpos != 0) {
 476                 n = 45 - shar->outpos;
 477                 if (n > length)
 478                         n = length;
 479                 memcpy(shar->outbuff + shar->outpos, src, n);
 480                 if (shar->outpos + n < 45) {
 481                         shar->outpos += n;
 482                         return length;
 483                 }
 484                 uuencode_line(a, shar, shar->outbuff, 45);
 485                 src += n;
 486                 n = length - n;
 487         } else {
 488                 n = length;
 489         }
 490
 491         while (n >= 45) {
 492                 uuencode_line(a, shar, src, 45);
 493                 src += 45;
 494                 n -= 45;
 495
 496                 if (shar->work.length < 65536)
 497                         continue;
 498                 ret = __archive_write_output(a, shar->work.s,
 499                     shar->work.length);
 500                 if (ret != ARCHIVE_OK)
 501                         return (ARCHIVE_FATAL);
 502                 archive_string_empty(&shar->work);
 503         }
 504         if (n != 0) {
 505                 memcpy(shar->outbuff, src, n);
 506                 shar->outpos = n;
 507         }
 508         return (length);
 509 }
 510
 511 static int
 512 archive_write_shar_finish_entry(struct archive_write *a)
 513 {
 514         const char *g, *p, *u;
 515         struct shar *shar;
 516         int ret;
 517
 518         shar = (struct shar *)a->format_data;
 519         if (shar->entry == NULL)
 520                 return (0);
 521
 522         if (shar->dump) {
 523                 /* Finish uuencoded data. */
 524                 if (shar->has_data) {
 525                         if (shar->outpos > 0)
 526                                 uuencode_line(a, shar, shar->outbuff,
 527                                     shar->outpos);
 528                         archive_strcat(&shar->work, "`\nend\n");
 529                         archive_strcat(&shar->work, "SHAR_END\n");
 530                 }
 531                 /* Restore file mode, owner, flags. */
 532                 /*
 533                  * TODO: Don't immediately restore mode for
 534                  * directories; defer that to end of script.
 535                  */
 536                 archive_string_sprintf(&shar->work, "chmod %o ",
 537                     (unsigned int)(archive_entry_mode(shar->entry) & 07777));
 538                 shar_quote(&shar->work, archive_entry_pathname(shar->entry), 1);
 539                 archive_strcat(&shar->work, "\n");
 540
 541                 u = archive_entry_uname(shar->entry);
 542                 g = archive_entry_gname(shar->entry);
 543                 if (u != NULL || g != NULL) {
 544                         archive_strcat(&shar->work, "chown ");
 545                         if (u != NULL)
 546                                 shar_quote(&shar->work, u, 1);
 547                         if (g != NULL) {
 548                                 archive_strcat(&shar->work, ":");
 549                                 shar_quote(&shar->work, g, 1);
 550                         }
 551                         archive_strcat(&shar->work, " ");
 552                         shar_quote(&shar->work,
 553                             archive_entry_pathname(shar->entry), 1);
 554                         archive_strcat(&shar->work, "\n");
 555                 }
 556
 557                 if ((p = archive_entry_fflags_text(shar->entry)) != NULL) {
 558                         archive_string_sprintf(&shar->work, "chflags %s ", p);
 559                         shar_quote(&shar->work,
 560                             archive_entry_pathname(shar->entry), 1);
 561                         archive_strcat(&shar->work, "\n");
 562                 }
 563
 564                 /* TODO: restore ACLs */
 565
 566         } else {
 567                 if (shar->has_data) {
 568                         /* Finish sed-encoded data:  ensure last line ends. */
 569                         if (!shar->end_of_line)
 570                                 archive_strappend_char(&shar->work, '\n');
 571                         archive_strcat(&shar->work, "SHAR_END\n");
 572                 }
 573         }
 574
 575         archive_entry_free(shar->entry);
 576         shar->entry = NULL;
 577
 578         if (shar->work.length < 65536)
 579                 return (ARCHIVE_OK);
 580
 581         ret = __archive_write_output(a, shar->work.s, shar->work.length);
 582         if (ret != ARCHIVE_OK)
 583                 return (ARCHIVE_FATAL);
 584         archive_string_empty(&shar->work);
 585
 586         return (ARCHIVE_OK);
 587 }
 588
 589 static int
 590 archive_write_shar_close(struct archive_write *a)
 591 {
 592         struct shar *shar;
 593         int ret;
 594
 595         /*
 596          * TODO: Accumulate list of directory names/modes and
 597          * fix them all up at end-of-archive.
 598          */
 599
 600         shar = (struct shar *)a->format_data;
 601
 602         /*
 603          * Only write the end-of-archive markers if the archive was
 604          * actually started.  This avoids problems if someone sets
 605          * shar format, then sets another format (which would invoke
 606          * shar_finish to free the format-specific data).
 607          */
 608         if (shar->wrote_header == 0)
 609                 return (ARCHIVE_OK);
 610
 611         archive_strcat(&shar->work, "exit\n");
 612
 613         ret = __archive_write_output(a, shar->work.s, shar->work.length);
 614         if (ret != ARCHIVE_OK)
 615                 return (ARCHIVE_FATAL);
 616
 617         /* Shar output is never padded. */
 618         archive_write_set_bytes_in_last_block(&a->archive, 1);
 619         /*
 620          * TODO: shar should also suppress padding of
 621          * uncompressed data within gzip/bzip2 streams.
 622          */
 623
 624         return (ARCHIVE_OK);
 625 }
 626
 627 static int
 628 archive_write_shar_free(struct archive_write *a)
 629 {
 630         struct shar *shar;
 631
 632         shar = (struct shar *)a->format_data;
 633         if (shar == NULL)
 634                 return (ARCHIVE_OK);
 635
 636         archive_entry_free(shar->entry);
 637         free(shar->last_dir);
 638         archive_string_free(&(shar->work));
 639         archive_string_free(&(shar->quoted_name));
 640         free(shar);
 641         a->format_data = NULL;
 642         return (ARCHIVE_OK);
 643 }