contrib/libarchive/libarchive/archive_write.c

   1 /*-
   2  * Copyright (c) 2003-2010 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: head/lib/libarchive/archive_write.c 201099 2009-12-28 03:03:00Z kientzle $");
  28
  29 /*
  30  * This file contains the "essential" portions of the write API, that
  31  * is, stuff that will essentially always be used by any client that
  32  * actually needs to write an archive.  Optional pieces have been, as
  33  * far as possible, separated out into separate files to reduce
  34  * needlessly bloating statically-linked clients.
  35  */
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #include <sys/wait.h>
  39 #endif
  40 #ifdef HAVE_ERRNO_H
  41 #include <errno.h>
  42 #endif
  43 #ifdef HAVE_LIMITS_H
  44 #include <limits.h>
  45 #endif
  46 #include <stdio.h>
  47 #ifdef HAVE_STDLIB_H
  48 #include <stdlib.h>
  49 #endif
  50 #ifdef HAVE_STRING_H
  51 #include <string.h>
  52 #endif
  53 #include <time.h>
  54 #ifdef HAVE_UNISTD_H
  55 #include <unistd.h>
  56 #endif
  57
  58 #include "archive.h"
  59 #include "archive_entry.h"
  60 #include "archive_private.h"
  61 #include "archive_write_private.h"
  62
  63 static struct archive_vtable *archive_write_vtable(void);
  64
  65 static int      _archive_filter_code(struct archive *, int);
  66 static const char *_archive_filter_name(struct archive *, int);
  67 static int64_t  _archive_filter_bytes(struct archive *, int);
  68 static int  _archive_write_filter_count(struct archive *);
  69 static int      _archive_write_close(struct archive *);
  70 static int      _archive_write_free(struct archive *);
  71 static int      _archive_write_header(struct archive *, struct archive_entry *);
  72 static int      _archive_write_finish_entry(struct archive *);
  73 static ssize_t  _archive_write_data(struct archive *, const void *, size_t);
  74
  75 struct archive_none {
  76         size_t buffer_size;
  77         size_t avail;
  78         char *buffer;
  79         char *next;
  80 };
  81
  82 static struct archive_vtable *
  83 archive_write_vtable(void)
  84 {
  85         static struct archive_vtable av;
  86         static int inited = 0;
  87
  88         if (!inited) {
  89                 av.archive_close = _archive_write_close;
  90                 av.archive_filter_bytes = _archive_filter_bytes;
  91                 av.archive_filter_code = _archive_filter_code;
  92                 av.archive_filter_name = _archive_filter_name;
  93                 av.archive_filter_count = _archive_write_filter_count;
  94                 av.archive_free = _archive_write_free;
  95                 av.archive_write_header = _archive_write_header;
  96                 av.archive_write_finish_entry = _archive_write_finish_entry;
  97                 av.archive_write_data = _archive_write_data;
  98                 inited = 1;
  99         }
 100         return (&av);
 101 }
 102
 103 /*
 104  * Allocate, initialize and return an archive object.
 105  */
 106 struct archive *
 107 archive_write_new(void)
 108 {
 109         struct archive_write *a;
 110         unsigned char *nulls;
 111
 112         a = (struct archive_write *)calloc(1, sizeof(*a));
 113         if (a == NULL)
 114                 return (NULL);
 115         a->archive.magic = ARCHIVE_WRITE_MAGIC;
 116         a->archive.state = ARCHIVE_STATE_NEW;
 117         a->archive.vtable = archive_write_vtable();
 118         /*
 119          * The value 10240 here matches the traditional tar default,
 120          * but is otherwise arbitrary.
 121          * TODO: Set the default block size from the format selected.
 122          */
 123         a->bytes_per_block = 10240;
 124         a->bytes_in_last_block = -1;    /* Default */
 125
 126         /* Initialize a block of nulls for padding purposes. */
 127         a->null_length = 1024;
 128         nulls = (unsigned char *)calloc(1, a->null_length);
 129         if (nulls == NULL) {
 130                 free(a);
 131                 return (NULL);
 132         }
 133         a->nulls = nulls;
 134         return (&a->archive);
 135 }
 136
 137 /*
 138  * Set the block size.  Returns 0 if successful.
 139  */
 140 int
 141 archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
 142 {
 143         struct archive_write *a = (struct archive_write *)_a;
 144         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 145             ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");
 146         a->bytes_per_block = bytes_per_block;
 147         return (ARCHIVE_OK);
 148 }
 149
 150 /*
 151  * Get the current block size.  -1 if it has never been set.
 152  */
 153 int
 154 archive_write_get_bytes_per_block(struct archive *_a)
 155 {
 156         struct archive_write *a = (struct archive_write *)_a;
 157         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 158             ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
 159         return (a->bytes_per_block);
 160 }
 161
 162 /*
 163  * Set the size for the last block.
 164  * Returns 0 if successful.
 165  */
 166 int
 167 archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
 168 {
 169         struct archive_write *a = (struct archive_write *)_a;
 170         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 171             ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
 172         a->bytes_in_last_block = bytes;
 173         return (ARCHIVE_OK);
 174 }
 175
 176 /*
 177  * Return the value set above.  -1 indicates it has not been set.
 178  */
 179 int
 180 archive_write_get_bytes_in_last_block(struct archive *_a)
 181 {
 182         struct archive_write *a = (struct archive_write *)_a;
 183         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 184             ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
 185         return (a->bytes_in_last_block);
 186 }
 187
 188 /*
 189  * dev/ino of a file to be rejected.  Used to prevent adding
 190  * an archive to itself recursively.
 191  */
 192 int
 193 archive_write_set_skip_file(struct archive *_a, la_int64_t d, la_int64_t i)
 194 {
 195         struct archive_write *a = (struct archive_write *)_a;
 196         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 197             ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
 198         a->skip_file_set = 1;
 199         a->skip_file_dev = d;
 200         a->skip_file_ino = i;
 201         return (ARCHIVE_OK);
 202 }
 203
 204 /*
 205  * Allocate and return the next filter structure.
 206  */
 207 struct archive_write_filter *
 208 __archive_write_allocate_filter(struct archive *_a)
 209 {
 210         struct archive_write *a = (struct archive_write *)_a;
 211         struct archive_write_filter *f;
 212
 213         f = calloc(1, sizeof(*f));
 214         f->archive = _a;
 215         f->state = ARCHIVE_WRITE_FILTER_STATE_NEW;
 216         if (a->filter_first == NULL)
 217                 a->filter_first = f;
 218         else
 219                 a->filter_last->next_filter = f;
 220         a->filter_last = f;
 221         return f;
 222 }
 223
 224 /*
 225  * Write data to a particular filter.
 226  */
 227 int
 228 __archive_write_filter(struct archive_write_filter *f,
 229     const void *buff, size_t length)
 230 {
 231         int r;
 232         /* Never write to non-open filters */
 233         if (f->state != ARCHIVE_WRITE_FILTER_STATE_OPEN)
 234                 return(ARCHIVE_FATAL);
 235         if (length == 0)
 236                 return(ARCHIVE_OK);
 237         if (f->write == NULL)
 238                 /* If unset, a fatal error has already occurred, so this filter
 239                  * didn't open. We cannot write anything. */
 240                 return(ARCHIVE_FATAL);
 241         r = (f->write)(f, buff, length);
 242         f->bytes_written += length;
 243         return (r);
 244 }
 245
 246 /*
 247  * Recursive function for opening the filter chain
 248  * Last filter is opened first
 249  */
 250 static int
 251 __archive_write_open_filter(struct archive_write_filter *f)
 252 {
 253         int ret;
 254
 255         ret = ARCHIVE_OK;
 256         if (f->next_filter != NULL)
 257                 ret = __archive_write_open_filter(f->next_filter);
 258         if (ret != ARCHIVE_OK)
 259                 return (ret);
 260         if (f->state != ARCHIVE_WRITE_FILTER_STATE_NEW)
 261                 return (ARCHIVE_FATAL);
 262         if (f->open == NULL) {
 263                 f->state = ARCHIVE_WRITE_FILTER_STATE_OPEN;
 264                 return (ARCHIVE_OK);
 265         }
 266         ret = (f->open)(f);
 267         if (ret == ARCHIVE_OK)
 268                 f->state = ARCHIVE_WRITE_FILTER_STATE_OPEN;
 269         else
 270                 f->state = ARCHIVE_WRITE_FILTER_STATE_FATAL;
 271         return (ret);
 272 }
 273
 274 /*
 275  * Open all filters
 276  */
 277 static int
 278 __archive_write_filters_open(struct archive_write *a)
 279 {
 280         return (__archive_write_open_filter(a->filter_first));
 281 }
 282
 283 /*
 284  * Close all filtes
 285  */
 286 static int
 287 __archive_write_filters_close(struct archive_write *a)
 288 {
 289         struct archive_write_filter *f;
 290         int ret, ret1;
 291         ret = ARCHIVE_OK;
 292         for (f = a->filter_first; f != NULL; f = f->next_filter) {
 293                 /* Do not close filters that are not open */
 294                 if (f->state == ARCHIVE_WRITE_FILTER_STATE_OPEN) {
 295                         if (f->close != NULL) {
 296                                 ret1 = (f->close)(f);
 297                                 if (ret1 < ret)
 298                                         ret = ret1;
 299                                 if (ret1 == ARCHIVE_OK) {
 300                                         f->state =
 301                                             ARCHIVE_WRITE_FILTER_STATE_CLOSED;
 302                                 } else {
 303                                         f->state =
 304                                             ARCHIVE_WRITE_FILTER_STATE_FATAL;
 305                                 }
 306                         } else
 307                                 f->state = ARCHIVE_WRITE_FILTER_STATE_CLOSED;
 308                 }
 309         }
 310         return (ret);
 311 }
 312
 313 int
 314 __archive_write_output(struct archive_write *a, const void *buff, size_t length)
 315 {
 316         return (__archive_write_filter(a->filter_first, buff, length));
 317 }
 318
 319 int
 320 __archive_write_nulls(struct archive_write *a, size_t length)
 321 {
 322         if (length == 0)
 323                 return (ARCHIVE_OK);
 324
 325         while (length > 0) {
 326                 size_t to_write = length < a->null_length ? length : a->null_length;
 327                 int r = __archive_write_output(a, a->nulls, to_write);
 328                 if (r < ARCHIVE_OK)
 329                         return (r);
 330                 length -= to_write;
 331         }
 332         return (ARCHIVE_OK);
 333 }
 334
 335 static int
 336 archive_write_client_open(struct archive_write_filter *f)
 337 {
 338         struct archive_write *a = (struct archive_write *)f->archive;
 339         struct archive_none *state;
 340         void *buffer;
 341         size_t buffer_size;
 342         int ret;
 343
 344         f->bytes_per_block = archive_write_get_bytes_per_block(f->archive);
 345         f->bytes_in_last_block =
 346             archive_write_get_bytes_in_last_block(f->archive);
 347         buffer_size = f->bytes_per_block;
 348
 349         state = (struct archive_none *)calloc(1, sizeof(*state));
 350         buffer = (char *)malloc(buffer_size);
 351         if (state == NULL || buffer == NULL) {
 352                 free(state);
 353                 free(buffer);
 354                 archive_set_error(f->archive, ENOMEM,
 355                     "Can't allocate data for output buffering");
 356                 return (ARCHIVE_FATAL);
 357         }
 358
 359         state->buffer_size = buffer_size;
 360         state->buffer = buffer;
 361         state->next = state->buffer;
 362         state->avail = state->buffer_size;
 363         f->data = state;
 364
 365         if (a->client_opener == NULL)
 366                 return (ARCHIVE_OK);
 367         ret = a->client_opener(f->archive, a->client_data);
 368         if (ret != ARCHIVE_OK) {
 369                 free(state->buffer);
 370                 free(state);
 371                 f->data = NULL;
 372         }
 373         return (ret);
 374 }
 375
 376 static int
 377 archive_write_client_write(struct archive_write_filter *f,
 378     const void *_buff, size_t length)
 379 {
 380         struct archive_write *a = (struct archive_write *)f->archive;
 381         struct archive_none *state = (struct archive_none *)f->data;
 382         const char *buff = (const char *)_buff;
 383         ssize_t remaining, to_copy;
 384         ssize_t bytes_written;
 385
 386         remaining = length;
 387
 388         /*
 389          * If there is no buffer for blocking, just pass the data
 390          * straight through to the client write callback.  In
 391          * particular, this supports "no write delay" operation for
 392          * special applications.  Just set the block size to zero.
 393          */
 394         if (state->buffer_size == 0) {
 395                 while (remaining > 0) {
 396                         bytes_written = (a->client_writer)(&a->archive,
 397                             a->client_data, buff, remaining);
 398                         if (bytes_written <= 0)
 399                                 return (ARCHIVE_FATAL);
 400                         remaining -= bytes_written;
 401                         buff += bytes_written;
 402                 }
 403                 return (ARCHIVE_OK);
 404         }
 405
 406         /* If the copy buffer isn't empty, try to fill it. */
 407         if (state->avail < state->buffer_size) {
 408                 /* If buffer is not empty... */
 409                 /* ... copy data into buffer ... */
 410                 to_copy = ((size_t)remaining > state->avail) ?
 411                         state->avail : (size_t)remaining;
 412                 memcpy(state->next, buff, to_copy);
 413                 state->next += to_copy;
 414                 state->avail -= to_copy;
 415                 buff += to_copy;
 416                 remaining -= to_copy;
 417                 /* ... if it's full, write it out. */
 418                 if (state->avail == 0) {
 419                         char *p = state->buffer;
 420                         size_t to_write = state->buffer_size;
 421                         while (to_write > 0) {
 422                                 bytes_written = (a->client_writer)(&a->archive,
 423                                     a->client_data, p, to_write);
 424                                 if (bytes_written <= 0)
 425                                         return (ARCHIVE_FATAL);
 426                                 if ((size_t)bytes_written > to_write) {
 427                                         archive_set_error(&(a->archive),
 428                                             -1, "write overrun");
 429                                         return (ARCHIVE_FATAL);
 430                                 }
 431                                 p += bytes_written;
 432                                 to_write -= bytes_written;
 433                         }
 434                         state->next = state->buffer;
 435                         state->avail = state->buffer_size;
 436                 }
 437         }
 438
 439         while ((size_t)remaining >= state->buffer_size) {
 440                 /* Write out full blocks directly to client. */
 441                 bytes_written = (a->client_writer)(&a->archive,
 442                     a->client_data, buff, state->buffer_size);
 443                 if (bytes_written <= 0)
 444                         return (ARCHIVE_FATAL);
 445                 buff += bytes_written;
 446                 remaining -= bytes_written;
 447         }
 448
 449         if (remaining > 0) {
 450                 /* Copy last bit into copy buffer. */
 451                 memcpy(state->next, buff, remaining);
 452                 state->next += remaining;
 453                 state->avail -= remaining;
 454         }
 455         return (ARCHIVE_OK);
 456 }
 457
 458 static int
 459 archive_write_client_close(struct archive_write_filter *f)
 460 {
 461         struct archive_write *a = (struct archive_write *)f->archive;
 462         struct archive_none *state = (struct archive_none *)f->data;
 463         ssize_t block_length;
 464         ssize_t target_block_length;
 465         ssize_t bytes_written;
 466         int ret = ARCHIVE_OK;
 467
 468         /* If there's pending data, pad and write the last block */
 469         if (state->next != state->buffer) {
 470                 block_length = state->buffer_size - state->avail;
 471
 472                 /* Tricky calculation to determine size of last block */
 473                 if (a->bytes_in_last_block <= 0)
 474                         /* Default or Zero: pad to full block */
 475                         target_block_length = a->bytes_per_block;
 476                 else
 477                         /* Round to next multiple of bytes_in_last_block. */
 478                         target_block_length = a->bytes_in_last_block *
 479                             ( (block_length + a->bytes_in_last_block - 1) /
 480                                 a->bytes_in_last_block);
 481                 if (target_block_length > a->bytes_per_block)
 482                         target_block_length = a->bytes_per_block;
 483                 if (block_length < target_block_length) {
 484                         memset(state->next, 0,
 485                             target_block_length - block_length);
 486                         block_length = target_block_length;
 487                 }
 488                 bytes_written = (a->client_writer)(&a->archive,
 489                     a->client_data, state->buffer, block_length);
 490                 ret = bytes_written <= 0 ? ARCHIVE_FATAL : ARCHIVE_OK;
 491         }
 492         if (a->client_closer)
 493                 (*a->client_closer)(&a->archive, a->client_data);
 494         free(state->buffer);
 495         free(state);
 496         a->client_data = NULL;
 497         /* Clear passphrase. */
 498         if (a->passphrase != NULL) {
 499                 memset(a->passphrase, 0, strlen(a->passphrase));
 500                 free(a->passphrase);
 501                 a->passphrase = NULL;
 502         }
 503         /* Clear the close handler myself not to be called again. */
 504         f->state = ARCHIVE_WRITE_FILTER_STATE_CLOSED;
 505         return (ret);
 506 }
 507
 508 /*
 509  * Open the archive using the current settings.
 510  */
 511 int
 512 archive_write_open(struct archive *_a, void *client_data,
 513     archive_open_callback *opener, archive_write_callback *writer,
 514     archive_close_callback *closer)
 515 {
 516         struct archive_write *a = (struct archive_write *)_a;
 517         struct archive_write_filter *client_filter;
 518         int ret, r1;
 519
 520         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 521             ARCHIVE_STATE_NEW, "archive_write_open");
 522         archive_clear_error(&a->archive);
 523
 524         a->client_writer = writer;
 525         a->client_opener = opener;
 526         a->client_closer = closer;
 527         a->client_data = client_data;
 528
 529         client_filter = __archive_write_allocate_filter(_a);
 530         client_filter->open = archive_write_client_open;
 531         client_filter->write = archive_write_client_write;
 532         client_filter->close = archive_write_client_close;
 533
 534         ret = __archive_write_filters_open(a);
 535         if (ret < ARCHIVE_WARN) {
 536                 r1 = __archive_write_filters_close(a);
 537                 __archive_write_filters_free(_a);
 538                 return (r1 < ret ? r1 : ret);
 539         }
 540
 541         a->archive.state = ARCHIVE_STATE_HEADER;
 542         if (a->format_init)
 543                 ret = (a->format_init)(a);
 544         return (ret);
 545 }
 546
 547 /*
 548  * Close out the archive.
 549  */
 550 static int
 551 _archive_write_close(struct archive *_a)
 552 {
 553         struct archive_write *a = (struct archive_write *)_a;
 554         int r = ARCHIVE_OK, r1 = ARCHIVE_OK;
 555
 556         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 557             ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL,
 558             "archive_write_close");
 559         if (a->archive.state == ARCHIVE_STATE_NEW
 560             || a->archive.state == ARCHIVE_STATE_CLOSED)
 561                 return (ARCHIVE_OK); /* Okay to close() when not open. */
 562
 563         archive_clear_error(&a->archive);
 564
 565         /* Finish the last entry if a finish callback is specified */
 566         if (a->archive.state == ARCHIVE_STATE_DATA
 567             && a->format_finish_entry != NULL)
 568                 r = ((a->format_finish_entry)(a));
 569
 570         /* Finish off the archive. */
 571         /* TODO: have format closers invoke compression close. */
 572         if (a->format_close != NULL) {
 573                 r1 = (a->format_close)(a);
 574                 if (r1 < r)
 575                         r = r1;
 576         }
 577
 578         /* Finish the compression and close the stream. */
 579         r1 = __archive_write_filters_close(a);
 580         if (r1 < r)
 581                 r = r1;
 582
 583         if (a->archive.state != ARCHIVE_STATE_FATAL)
 584                 a->archive.state = ARCHIVE_STATE_CLOSED;
 585         return (r);
 586 }
 587
 588 static int
 589 _archive_write_filter_count(struct archive *_a)
 590 {
 591         struct archive_write *a = (struct archive_write *)_a;
 592         struct archive_write_filter *p = a->filter_first;
 593         int count = 0;
 594         while(p) {
 595                 count++;
 596                 p = p->next_filter;
 597         }
 598         return count;
 599 }
 600
 601 void
 602 __archive_write_filters_free(struct archive *_a)
 603 {
 604         struct archive_write *a = (struct archive_write *)_a;
 605         int r = ARCHIVE_OK, r1;
 606
 607         while (a->filter_first != NULL) {
 608                 struct archive_write_filter *next
 609                     = a->filter_first->next_filter;
 610                 if (a->filter_first->free != NULL) {
 611                         r1 = (*a->filter_first->free)(a->filter_first);
 612                         if (r > r1)
 613                                 r = r1;
 614                 }
 615                 free(a->filter_first);
 616                 a->filter_first = next;
 617         }
 618         a->filter_last = NULL;
 619 }
 620
 621 /*
 622  * Destroy the archive structure.
 623  *
 624  * Be careful: user might just call write_new and then write_free.
 625  * Don't assume we actually wrote anything or performed any non-trivial
 626  * initialization.
 627  */
 628 static int
 629 _archive_write_free(struct archive *_a)
 630 {
 631         struct archive_write *a = (struct archive_write *)_a;
 632         int r = ARCHIVE_OK, r1;
 633
 634         if (_a == NULL)
 635                 return (ARCHIVE_OK);
 636         /* It is okay to call free() in state FATAL. */
 637         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 638             ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_free");
 639         if (a->archive.state != ARCHIVE_STATE_FATAL)
 640                 r = archive_write_close(&a->archive);
 641
 642         /* Release format resources. */
 643         if (a->format_free != NULL) {
 644                 r1 = (a->format_free)(a);
 645                 if (r1 < r)
 646                         r = r1;
 647         }
 648
 649         __archive_write_filters_free(_a);
 650
 651         /* Release various dynamic buffers. */
 652         free((void *)(uintptr_t)(const void *)a->nulls);
 653         archive_string_free(&a->archive.error_string);
 654         if (a->passphrase != NULL) {
 655                 /* A passphrase should be cleaned. */
 656                 memset(a->passphrase, 0, strlen(a->passphrase));
 657                 free(a->passphrase);
 658         }
 659         a->archive.magic = 0;
 660         __archive_clean(&a->archive);
 661         free(a);
 662         return (r);
 663 }
 664
 665 /*
 666  * Write the appropriate header.
 667  */
 668 static int
 669 _archive_write_header(struct archive *_a, struct archive_entry *entry)
 670 {
 671         struct archive_write *a = (struct archive_write *)_a;
 672         int ret, r2;
 673
 674         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 675             ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header");
 676         archive_clear_error(&a->archive);
 677
 678         if (a->format_write_header == NULL) {
 679                 archive_set_error(&(a->archive), -1,
 680                     "Format must be set before you can write to an archive.");
 681                 a->archive.state = ARCHIVE_STATE_FATAL;
 682                 return (ARCHIVE_FATAL);
 683         }
 684
 685         /* In particular, "retry" and "fatal" get returned immediately. */
 686         ret = archive_write_finish_entry(&a->archive);
 687         if (ret == ARCHIVE_FATAL) {
 688                 a->archive.state = ARCHIVE_STATE_FATAL;
 689                 return (ARCHIVE_FATAL);
 690         }
 691         if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
 692                 return (ret);
 693
 694         if (a->skip_file_set &&
 695             archive_entry_dev_is_set(entry) &&
 696             archive_entry_ino_is_set(entry) &&
 697             archive_entry_dev(entry) == (dev_t)a->skip_file_dev &&
 698             archive_entry_ino64(entry) == a->skip_file_ino) {
 699                 archive_set_error(&a->archive, 0,
 700                     "Can't add archive to itself");
 701                 return (ARCHIVE_FAILED);
 702         }
 703
 704         /* Format and write header. */
 705         r2 = ((a->format_write_header)(a, entry));
 706         if (r2 == ARCHIVE_FAILED) {
 707                 return (ARCHIVE_FAILED);
 708         }
 709         if (r2 == ARCHIVE_FATAL) {
 710                 a->archive.state = ARCHIVE_STATE_FATAL;
 711                 return (ARCHIVE_FATAL);
 712         }
 713         if (r2 < ret)
 714                 ret = r2;
 715
 716         a->archive.state = ARCHIVE_STATE_DATA;
 717         return (ret);
 718 }
 719
 720 static int
 721 _archive_write_finish_entry(struct archive *_a)
 722 {
 723         struct archive_write *a = (struct archive_write *)_a;
 724         int ret = ARCHIVE_OK;
 725
 726         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 727             ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
 728             "archive_write_finish_entry");
 729         if (a->archive.state & ARCHIVE_STATE_DATA
 730             && a->format_finish_entry != NULL)
 731                 ret = (a->format_finish_entry)(a);
 732         a->archive.state = ARCHIVE_STATE_HEADER;
 733         return (ret);
 734 }
 735
 736 /*
 737  * Note that the compressor is responsible for blocking.
 738  */
 739 static ssize_t
 740 _archive_write_data(struct archive *_a, const void *buff, size_t s)
 741 {
 742         struct archive_write *a = (struct archive_write *)_a;
 743         const size_t max_write = INT_MAX;
 744
 745         archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 746             ARCHIVE_STATE_DATA, "archive_write_data");
 747         /* In particular, this catches attempts to pass negative values. */
 748         if (s > max_write)
 749                 s = max_write;
 750         archive_clear_error(&a->archive);
 751         return ((a->format_write_data)(a, buff, s));
 752 }
 753
 754 static struct archive_write_filter *
 755 filter_lookup(struct archive *_a, int n)
 756 {
 757         struct archive_write *a = (struct archive_write *)_a;
 758         struct archive_write_filter *f = a->filter_first;
 759         if (n == -1)
 760                 return a->filter_last;
 761         if (n < 0)
 762                 return NULL;
 763         while (n > 0 && f != NULL) {
 764                 f = f->next_filter;
 765                 --n;
 766         }
 767         return f;
 768 }
 769
 770 static int
 771 _archive_filter_code(struct archive *_a, int n)
 772 {
 773         struct archive_write_filter *f = filter_lookup(_a, n);
 774         return f == NULL ? -1 : f->code;
 775 }
 776
 777 static const char *
 778 _archive_filter_name(struct archive *_a, int n)
 779 {
 780         struct archive_write_filter *f = filter_lookup(_a, n);
 781         return f != NULL ? f->name : NULL;
 782 }
 783
 784 static int64_t
 785 _archive_filter_bytes(struct archive *_a, int n)
 786 {
 787         struct archive_write_filter *f = filter_lookup(_a, n);
 788         return f == NULL ? -1 : f->bytes_written;
 789 }