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 *)malloc(sizeof(*a)); 113 if (a == NULL) 114 return (NULL); 115 memset(a, 0, sizeof(*a)); 116 a->archive.magic = ARCHIVE_WRITE_MAGIC; 117 a->archive.state = ARCHIVE_STATE_NEW; 118 a->archive.vtable = archive_write_vtable(); 119 /* 120 * The value 10240 here matches the traditional tar default, 121 * but is otherwise arbitrary. 122 * TODO: Set the default block size from the format selected. 123 */ 124 a->bytes_per_block = 10240; 125 a->bytes_in_last_block = -1; /* Default */ 126 127 /* Initialize a block of nulls for padding purposes. */ 128 a->null_length = 1024; 129 nulls = (unsigned char *)malloc(a->null_length); 130 if (nulls == NULL) { 131 free(a); 132 return (NULL); 133 } 134 memset(nulls, 0, a->null_length); 135 a->nulls = nulls; 136 return (&a->archive); 137 } 138 139 /* 140 * Set the block size. Returns 0 if successful. 141 */ 142 int 143 archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block) 144 { 145 struct archive_write *a = (struct archive_write *)_a; 146 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 147 ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block"); 148 a->bytes_per_block = bytes_per_block; 149 return (ARCHIVE_OK); 150 } 151 152 /* 153 * Get the current block size. -1 if it has never been set. 154 */ 155 int 156 archive_write_get_bytes_per_block(struct archive *_a) 157 { 158 struct archive_write *a = (struct archive_write *)_a; 159 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 160 ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block"); 161 return (a->bytes_per_block); 162 } 163 164 /* 165 * Set the size for the last block. 166 * Returns 0 if successful. 167 */ 168 int 169 archive_write_set_bytes_in_last_block(struct archive *_a, int bytes) 170 { 171 struct archive_write *a = (struct archive_write *)_a; 172 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 173 ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block"); 174 a->bytes_in_last_block = bytes; 175 return (ARCHIVE_OK); 176 } 177 178 /* 179 * Return the value set above. -1 indicates it has not been set. 180 */ 181 int 182 archive_write_get_bytes_in_last_block(struct archive *_a) 183 { 184 struct archive_write *a = (struct archive_write *)_a; 185 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 186 ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block"); 187 return (a->bytes_in_last_block); 188 } 189 190 /* 191 * dev/ino of a file to be rejected. Used to prevent adding 192 * an archive to itself recursively. 193 */ 194 int 195 archive_write_set_skip_file(struct archive *_a, int64_t d, int64_t i) 196 { 197 struct archive_write *a = (struct archive_write *)_a; 198 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 199 ARCHIVE_STATE_ANY, "archive_write_set_skip_file"); 200 a->skip_file_set = 1; 201 a->skip_file_dev = d; 202 a->skip_file_ino = i; 203 return (ARCHIVE_OK); 204 } 205 206 /* 207 * Allocate and return the next filter structure. 208 */ 209 struct archive_write_filter * 210 __archive_write_allocate_filter(struct archive *_a) 211 { 212 struct archive_write *a = (struct archive_write *)_a; 213 struct archive_write_filter *f; 214 215 f = calloc(1, sizeof(*f)); 216 f->archive = _a; 217 if (a->filter_first == NULL) 218 a->filter_first = f; 219 else 220 a->filter_last->next_filter = f; 221 a->filter_last = f; 222 return f; 223 } 224 225 /* 226 * Write data to a particular filter. 227 */ 228 int 229 __archive_write_filter(struct archive_write_filter *f, 230 const void *buff, size_t length) 231 { 232 int r; 233 if (length == 0) 234 return(ARCHIVE_OK); 235 if (f->write == NULL) 236 /* If unset, a fatal error has already ocuured, so this filter 237 * didn't open. We cannot write anything. */ 238 return(ARCHIVE_FATAL); 239 r = (f->write)(f, buff, length); 240 f->bytes_written += length; 241 return (r); 242 } 243 244 /* 245 * Open a filter. 246 */ 247 int 248 __archive_write_open_filter(struct archive_write_filter *f) 249 { 250 if (f->open == NULL) 251 return (ARCHIVE_OK); 252 return (f->open)(f); 253 } 254 255 /* 256 * Close a filter. 257 */ 258 int 259 __archive_write_close_filter(struct archive_write_filter *f) 260 { 261 if (f->close != NULL) 262 return (f->close)(f); 263 if (f->next_filter != NULL) 264 return (__archive_write_close_filter(f->next_filter)); 265 return (ARCHIVE_OK); 266 } 267 268 int 269 __archive_write_output(struct archive_write *a, const void *buff, size_t length) 270 { 271 return (__archive_write_filter(a->filter_first, buff, length)); 272 } 273 274 int 275 __archive_write_nulls(struct archive_write *a, size_t length) 276 { 277 if (length == 0) 278 return (ARCHIVE_OK); 279 280 while (length > 0) { 281 size_t to_write = length < a->null_length ? length : a->null_length; 282 int r = __archive_write_output(a, a->nulls, to_write); 283 if (r < ARCHIVE_OK) 284 return (r); 285 length -= to_write; 286 } 287 return (ARCHIVE_OK); 288 } 289 290 static int 291 archive_write_client_open(struct archive_write_filter *f) 292 { 293 struct archive_write *a = (struct archive_write *)f->archive; 294 struct archive_none *state; 295 void *buffer; 296 size_t buffer_size; 297 298 f->bytes_per_block = archive_write_get_bytes_per_block(f->archive); 299 f->bytes_in_last_block = 300 archive_write_get_bytes_in_last_block(f->archive); 301 buffer_size = f->bytes_per_block; 302 303 state = (struct archive_none *)calloc(1, sizeof(*state)); 304 buffer = (char *)malloc(buffer_size); 305 if (state == NULL || buffer == NULL) { 306 free(state); 307 free(buffer); 308 archive_set_error(f->archive, ENOMEM, 309 "Can't allocate data for output buffering"); 310 return (ARCHIVE_FATAL); 311 } 312 313 state->buffer_size = buffer_size; 314 state->buffer = buffer; 315 state->next = state->buffer; 316 state->avail = state->buffer_size; 317 f->data = state; 318 319 if (a->client_opener == NULL) 320 return (ARCHIVE_OK); 321 return (a->client_opener(f->archive, a->client_data)); 322 } 323 324 static int 325 archive_write_client_write(struct archive_write_filter *f, 326 const void *_buff, size_t length) 327 { 328 struct archive_write *a = (struct archive_write *)f->archive; 329 struct archive_none *state = (struct archive_none *)f->data; 330 const char *buff = (const char *)_buff; 331 ssize_t remaining, to_copy; 332 ssize_t bytes_written; 333 334 remaining = length; 335 336 /* 337 * If there is no buffer for blocking, just pass the data 338 * straight through to the client write callback. In 339 * particular, this supports "no write delay" operation for 340 * special applications. Just set the block size to zero. 341 */ 342 if (state->buffer_size == 0) { 343 while (remaining > 0) { 344 bytes_written = (a->client_writer)(&a->archive, 345 a->client_data, buff, remaining); 346 if (bytes_written <= 0) 347 return (ARCHIVE_FATAL); 348 remaining -= bytes_written; 349 buff += bytes_written; 350 } 351 return (ARCHIVE_OK); 352 } 353 354 /* If the copy buffer isn't empty, try to fill it. */ 355 if (state->avail < state->buffer_size) { 356 /* If buffer is not empty... */ 357 /* ... copy data into buffer ... */ 358 to_copy = ((size_t)remaining > state->avail) ? 359 state->avail : (size_t)remaining; 360 memcpy(state->next, buff, to_copy); 361 state->next += to_copy; 362 state->avail -= to_copy; 363 buff += to_copy; 364 remaining -= to_copy; 365 /* ... if it's full, write it out. */ 366 if (state->avail == 0) { 367 char *p = state->buffer; 368 size_t to_write = state->buffer_size; 369 while (to_write > 0) { 370 bytes_written = (a->client_writer)(&a->archive, 371 a->client_data, p, to_write); 372 if (bytes_written <= 0) 373 return (ARCHIVE_FATAL); 374 if ((size_t)bytes_written > to_write) { 375 archive_set_error(&(a->archive), 376 -1, "write overrun"); 377 return (ARCHIVE_FATAL); 378 } 379 p += bytes_written; 380 to_write -= bytes_written; 381 } 382 state->next = state->buffer; 383 state->avail = state->buffer_size; 384 } 385 } 386 387 while ((size_t)remaining >= state->buffer_size) { 388 /* Write out full blocks directly to client. */ 389 bytes_written = (a->client_writer)(&a->archive, 390 a->client_data, buff, state->buffer_size); 391 if (bytes_written <= 0) 392 return (ARCHIVE_FATAL); 393 buff += bytes_written; 394 remaining -= bytes_written; 395 } 396 397 if (remaining > 0) { 398 /* Copy last bit into copy buffer. */ 399 memcpy(state->next, buff, remaining); 400 state->next += remaining; 401 state->avail -= remaining; 402 } 403 return (ARCHIVE_OK); 404 } 405 406 static int 407 archive_write_client_close(struct archive_write_filter *f) 408 { 409 struct archive_write *a = (struct archive_write *)f->archive; 410 struct archive_none *state = (struct archive_none *)f->data; 411 ssize_t block_length; 412 ssize_t target_block_length; 413 ssize_t bytes_written; 414 int ret = ARCHIVE_OK; 415 416 /* If there's pending data, pad and write the last block */ 417 if (state->next != state->buffer) { 418 block_length = state->buffer_size - state->avail; 419 420 /* Tricky calculation to determine size of last block */ 421 if (a->bytes_in_last_block <= 0) 422 /* Default or Zero: pad to full block */ 423 target_block_length = a->bytes_per_block; 424 else 425 /* Round to next multiple of bytes_in_last_block. */ 426 target_block_length = a->bytes_in_last_block * 427 ( (block_length + a->bytes_in_last_block - 1) / 428 a->bytes_in_last_block); 429 if (target_block_length > a->bytes_per_block) 430 target_block_length = a->bytes_per_block; 431 if (block_length < target_block_length) { 432 memset(state->next, 0, 433 target_block_length - block_length); 434 block_length = target_block_length; 435 } 436 bytes_written = (a->client_writer)(&a->archive, 437 a->client_data, state->buffer, block_length); 438 ret = bytes_written <= 0 ? ARCHIVE_FATAL : ARCHIVE_OK; 439 } 440 if (a->client_closer) 441 (*a->client_closer)(&a->archive, a->client_data); 442 free(state->buffer); 443 free(state); 444 /* Clear the close handler myself not to be called again. */ 445 f->close = NULL; 446 a->client_data = NULL; 447 return (ret); 448 } 449 450 /* 451 * Open the archive using the current settings. 452 */ 453 int 454 archive_write_open(struct archive *_a, void *client_data, 455 archive_open_callback *opener, archive_write_callback *writer, 456 archive_close_callback *closer) 457 { 458 struct archive_write *a = (struct archive_write *)_a; 459 struct archive_write_filter *client_filter; 460 int ret, r1; 461 462 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 463 ARCHIVE_STATE_NEW, "archive_write_open"); 464 archive_clear_error(&a->archive); 465 466 a->client_writer = writer; 467 a->client_opener = opener; 468 a->client_closer = closer; 469 a->client_data = client_data; 470 471 client_filter = __archive_write_allocate_filter(_a); 472 client_filter->open = archive_write_client_open; 473 client_filter->write = archive_write_client_write; 474 client_filter->close = archive_write_client_close; 475 476 ret = __archive_write_open_filter(a->filter_first); 477 if (ret < ARCHIVE_WARN) { 478 r1 = __archive_write_close_filter(a->filter_first); 479 return (r1 < ret ? r1 : ret); 480 } 481 482 a->archive.state = ARCHIVE_STATE_HEADER; 483 if (a->format_init) 484 ret = (a->format_init)(a); 485 return (ret); 486 } 487 488 /* 489 * Close out the archive. 490 */ 491 static int 492 _archive_write_close(struct archive *_a) 493 { 494 struct archive_write *a = (struct archive_write *)_a; 495 int r = ARCHIVE_OK, r1 = ARCHIVE_OK; 496 497 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 498 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, 499 "archive_write_close"); 500 if (a->archive.state == ARCHIVE_STATE_NEW 501 || a->archive.state == ARCHIVE_STATE_CLOSED) 502 return (ARCHIVE_OK); /* Okay to close() when not open. */ 503 504 archive_clear_error(&a->archive); 505 506 /* Finish the last entry. */ 507 if (a->archive.state == ARCHIVE_STATE_DATA) 508 r = ((a->format_finish_entry)(a)); 509 510 /* Finish off the archive. */ 511 /* TODO: have format closers invoke compression close. */ 512 if (a->format_close != NULL) { 513 r1 = (a->format_close)(a); 514 if (r1 < r) 515 r = r1; 516 } 517 518 /* Finish the compression and close the stream. */ 519 r1 = __archive_write_close_filter(a->filter_first); 520 if (r1 < r) 521 r = r1; 522 523 if (a->archive.state != ARCHIVE_STATE_FATAL) 524 a->archive.state = ARCHIVE_STATE_CLOSED; 525 return (r); 526 } 527 528 static int 529 _archive_write_filter_count(struct archive *_a) 530 { 531 struct archive_write *a = (struct archive_write *)_a; 532 struct archive_write_filter *p = a->filter_first; 533 int count = 0; 534 while(p) { 535 count++; 536 p = p->next_filter; 537 } 538 return count; 539 } 540 541 void 542 __archive_write_filters_free(struct archive *_a) 543 { 544 struct archive_write *a = (struct archive_write *)_a; 545 int r = ARCHIVE_OK, r1; 546 547 while (a->filter_first != NULL) { 548 struct archive_write_filter *next 549 = a->filter_first->next_filter; 550 if (a->filter_first->free != NULL) { 551 r1 = (*a->filter_first->free)(a->filter_first); 552 if (r > r1) 553 r = r1; 554 } 555 free(a->filter_first); 556 a->filter_first = next; 557 } 558 a->filter_last = NULL; 559 } 560 561 /* 562 * Destroy the archive structure. 563 * 564 * Be careful: user might just call write_new and then write_free. 565 * Don't assume we actually wrote anything or performed any non-trivial 566 * initialization. 567 */ 568 static int 569 _archive_write_free(struct archive *_a) 570 { 571 struct archive_write *a = (struct archive_write *)_a; 572 int r = ARCHIVE_OK, r1; 573 574 if (_a == NULL) 575 return (ARCHIVE_OK); 576 /* It is okay to call free() in state FATAL. */ 577 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 578 ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_free"); 579 if (a->archive.state != ARCHIVE_STATE_FATAL) 580 r = archive_write_close(&a->archive); 581 582 /* Release format resources. */ 583 if (a->format_free != NULL) { 584 r1 = (a->format_free)(a); 585 if (r1 < r) 586 r = r1; 587 } 588 589 __archive_write_filters_free(_a); 590 591 /* Release various dynamic buffers. */ 592 free((void *)(uintptr_t)(const void *)a->nulls); 593 archive_string_free(&a->archive.error_string); 594 a->archive.magic = 0; 595 __archive_clean(&a->archive); 596 free(a); 597 return (r); 598 } 599 600 /* 601 * Write the appropriate header. 602 */ 603 static int 604 _archive_write_header(struct archive *_a, struct archive_entry *entry) 605 { 606 struct archive_write *a = (struct archive_write *)_a; 607 int ret, r2; 608 609 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 610 ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header"); 611 archive_clear_error(&a->archive); 612 613 if (a->format_write_header == NULL) { 614 archive_set_error(&(a->archive), -1, 615 "Format must be set before you can write to an archive."); 616 a->archive.state = ARCHIVE_STATE_FATAL; 617 return (ARCHIVE_FATAL); 618 } 619 620 /* In particular, "retry" and "fatal" get returned immediately. */ 621 ret = archive_write_finish_entry(&a->archive); 622 if (ret == ARCHIVE_FATAL) { 623 a->archive.state = ARCHIVE_STATE_FATAL; 624 return (ARCHIVE_FATAL); 625 } 626 if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN) 627 return (ret); 628 629 if (a->skip_file_set && 630 archive_entry_dev_is_set(entry) && 631 archive_entry_ino_is_set(entry) && 632 archive_entry_dev(entry) == (dev_t)a->skip_file_dev && 633 archive_entry_ino64(entry) == a->skip_file_ino) { 634 archive_set_error(&a->archive, 0, 635 "Can't add archive to itself"); 636 return (ARCHIVE_FAILED); 637 } 638 639 /* Format and write header. */ 640 r2 = ((a->format_write_header)(a, entry)); 641 if (r2 == ARCHIVE_FATAL) { 642 a->archive.state = ARCHIVE_STATE_FATAL; 643 return (ARCHIVE_FATAL); 644 } 645 if (r2 < ret) 646 ret = r2; 647 648 a->archive.state = ARCHIVE_STATE_DATA; 649 return (ret); 650 } 651 652 static int 653 _archive_write_finish_entry(struct archive *_a) 654 { 655 struct archive_write *a = (struct archive_write *)_a; 656 int ret = ARCHIVE_OK; 657 658 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 659 ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA, 660 "archive_write_finish_entry"); 661 if (a->archive.state & ARCHIVE_STATE_DATA) 662 ret = (a->format_finish_entry)(a); 663 a->archive.state = ARCHIVE_STATE_HEADER; 664 return (ret); 665 } 666 667 /* 668 * Note that the compressor is responsible for blocking. 669 */ 670 static ssize_t 671 _archive_write_data(struct archive *_a, const void *buff, size_t s) 672 { 673 struct archive_write *a = (struct archive_write *)_a; 674 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 675 ARCHIVE_STATE_DATA, "archive_write_data"); 676 archive_clear_error(&a->archive); 677 return ((a->format_write_data)(a, buff, s)); 678 } 679 680 static struct archive_write_filter * 681 filter_lookup(struct archive *_a, int n) 682 { 683 struct archive_write *a = (struct archive_write *)_a; 684 struct archive_write_filter *f = a->filter_first; 685 if (n == -1) 686 return a->filter_last; 687 if (n < 0) 688 return NULL; 689 while (n > 0 && f != NULL) { 690 f = f->next_filter; 691 --n; 692 } 693 return f; 694 } 695 696 static int 697 _archive_filter_code(struct archive *_a, int n) 698 { 699 struct archive_write_filter *f = filter_lookup(_a, n); 700 return f == NULL ? -1 : f->code; 701 } 702 703 static const char * 704 _archive_filter_name(struct archive *_a, int n) 705 { 706 struct archive_write_filter *f = filter_lookup(_a, n); 707 return f == NULL ? NULL : f->name; 708 } 709 710 static int64_t 711 _archive_filter_bytes(struct archive *_a, int n) 712 { 713 struct archive_write_filter *f = filter_lookup(_a, n); 714 return f == NULL ? -1 : f->bytes_written; 715 } 716