1/*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * Copyright (c) 2010-2012 Michihiro NAKAJIMA 4 * Copyright (c) 2016 Martin Matuska 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "archive_platform.h" 29__FBSDID("$FreeBSD: stable/10/contrib/libarchive/libarchive/archive_write_set_format_pax.c 358090 2020-02-19 01:51:44Z mm $"); 30 31#ifdef HAVE_ERRNO_H 32#include <errno.h> 33#endif 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_entry_locale.h" 44#include "archive_private.h" 45#include "archive_write_private.h" 46#include "archive_write_set_format_private.h" 47 48struct sparse_block { 49 struct sparse_block *next; 50 int is_hole; 51 uint64_t offset; 52 uint64_t remaining; 53}; 54 55struct pax { 56 uint64_t entry_bytes_remaining; 57 uint64_t entry_padding; 58 struct archive_string l_url_encoded_name; 59 struct archive_string pax_header; 60 struct archive_string sparse_map; 61 size_t sparse_map_padding; 62 struct sparse_block *sparse_list; 63 struct sparse_block *sparse_tail; 64 struct archive_string_conv *sconv_utf8; 65 int opt_binary; 66 67 unsigned flags; 68#define WRITE_SCHILY_XATTR (1 << 0) 69#define WRITE_LIBARCHIVE_XATTR (1 << 1) 70}; 71 72static void add_pax_attr(struct archive_string *, const char *key, 73 const char *value); 74static void add_pax_attr_binary(struct archive_string *, 75 const char *key, 76 const char *value, size_t value_len); 77static void add_pax_attr_int(struct archive_string *, 78 const char *key, int64_t value); 79static void add_pax_attr_time(struct archive_string *, 80 const char *key, int64_t sec, 81 unsigned long nanos); 82static int add_pax_acl(struct archive_write *, 83 struct archive_entry *, struct pax *, int); 84static ssize_t archive_write_pax_data(struct archive_write *, 85 const void *, size_t); 86static int archive_write_pax_close(struct archive_write *); 87static int archive_write_pax_free(struct archive_write *); 88static int archive_write_pax_finish_entry(struct archive_write *); 89static int archive_write_pax_header(struct archive_write *, 90 struct archive_entry *); 91static int archive_write_pax_options(struct archive_write *, 92 const char *, const char *); 93static char *base64_encode(const char *src, size_t len); 94static char *build_gnu_sparse_name(char *dest, const char *src); 95static char *build_pax_attribute_name(char *dest, const char *src); 96static char *build_ustar_entry_name(char *dest, const char *src, 97 size_t src_length, const char *insert); 98static char *format_int(char *dest, int64_t); 99static int has_non_ASCII(const char *); 100static void sparse_list_clear(struct pax *); 101static int sparse_list_add(struct pax *, int64_t, int64_t); 102static char *url_encode(const char *in); 103 104/* 105 * Set output format to 'restricted pax' format. 106 * 107 * This is the same as normal 'pax', but tries to suppress 108 * the pax header whenever possible. This is the default for 109 * bsdtar, for instance. 110 */ 111int 112archive_write_set_format_pax_restricted(struct archive *_a) 113{ 114 struct archive_write *a = (struct archive_write *)_a; 115 int r; 116 117 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 118 ARCHIVE_STATE_NEW, "archive_write_set_format_pax_restricted"); 119 120 r = archive_write_set_format_pax(&a->archive); 121 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 122 a->archive.archive_format_name = "restricted POSIX pax interchange"; 123 return (r); 124} 125 126/* 127 * Set output format to 'pax' format. 128 */ 129int 130archive_write_set_format_pax(struct archive *_a) 131{ 132 struct archive_write *a = (struct archive_write *)_a; 133 struct pax *pax; 134 135 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 136 ARCHIVE_STATE_NEW, "archive_write_set_format_pax"); 137 138 if (a->format_free != NULL) 139 (a->format_free)(a); 140 141 pax = (struct pax *)calloc(1, sizeof(*pax)); 142 if (pax == NULL) { 143 archive_set_error(&a->archive, ENOMEM, 144 "Can't allocate pax data"); 145 return (ARCHIVE_FATAL); 146 } 147 pax->flags = WRITE_LIBARCHIVE_XATTR | WRITE_SCHILY_XATTR; 148 149 a->format_data = pax; 150 a->format_name = "pax"; 151 a->format_options = archive_write_pax_options; 152 a->format_write_header = archive_write_pax_header; 153 a->format_write_data = archive_write_pax_data; 154 a->format_close = archive_write_pax_close; 155 a->format_free = archive_write_pax_free; 156 a->format_finish_entry = archive_write_pax_finish_entry; 157 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 158 a->archive.archive_format_name = "POSIX pax interchange"; 159 return (ARCHIVE_OK); 160} 161 162static int 163archive_write_pax_options(struct archive_write *a, const char *key, 164 const char *val) 165{ 166 struct pax *pax = (struct pax *)a->format_data; 167 int ret = ARCHIVE_FAILED; 168 169 if (strcmp(key, "hdrcharset") == 0) { 170 /* 171 * The character-set we can use are defined in 172 * IEEE Std 1003.1-2001 173 */ 174 if (val == NULL || val[0] == 0) 175 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 176 "pax: hdrcharset option needs a character-set name"); 177 else if (strcmp(val, "BINARY") == 0 || 178 strcmp(val, "binary") == 0) { 179 /* 180 * Specify binary mode. We will not convert 181 * filenames, uname and gname to any charsets. 182 */ 183 pax->opt_binary = 1; 184 ret = ARCHIVE_OK; 185 } else if (strcmp(val, "UTF-8") == 0) { 186 /* 187 * Specify UTF-8 character-set to be used for 188 * filenames. This is almost the test that 189 * running platform supports the string conversion. 190 * Especially libarchive_test needs this trick for 191 * its test. 192 */ 193 pax->sconv_utf8 = archive_string_conversion_to_charset( 194 &(a->archive), "UTF-8", 0); 195 if (pax->sconv_utf8 == NULL) 196 ret = ARCHIVE_FATAL; 197 else 198 ret = ARCHIVE_OK; 199 } else 200 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 201 "pax: invalid charset name"); 202 return (ret); 203 } else if (strcmp(key, "xattrheader") == 0) { 204 if (val == NULL || val[0] == 0) { 205 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 206 "pax: xattrheader requires a value"); 207 } else if (strcmp(val, "ALL") == 0 || 208 strcmp(val, "all") == 0) { 209 pax->flags |= WRITE_LIBARCHIVE_XATTR | WRITE_SCHILY_XATTR; 210 ret = ARCHIVE_OK; 211 } else if (strcmp(val, "SCHILY") == 0 || 212 strcmp(val, "schily") == 0) { 213 pax->flags |= WRITE_SCHILY_XATTR; 214 pax->flags &= ~WRITE_LIBARCHIVE_XATTR; 215 ret = ARCHIVE_OK; 216 } else if (strcmp(val, "LIBARCHIVE") == 0 || 217 strcmp(val, "libarchive") == 0) { 218 pax->flags |= WRITE_LIBARCHIVE_XATTR; 219 pax->flags &= ~WRITE_SCHILY_XATTR; 220 ret = ARCHIVE_OK; 221 } else 222 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 223 "pax: invalid xattr header name"); 224 return (ret); 225 } 226 227 /* Note: The "warn" return is just to inform the options 228 * supervisor that we didn't handle it. It will generate 229 * a suitable error if no one used this option. */ 230 return (ARCHIVE_WARN); 231} 232 233/* 234 * Note: This code assumes that 'nanos' has the same sign as 'sec', 235 * which implies that sec=-1, nanos=200000000 represents -1.2 seconds 236 * and not -0.8 seconds. This is a pretty pedantic point, as we're 237 * unlikely to encounter many real files created before Jan 1, 1970, 238 * much less ones with timestamps recorded to sub-second resolution. 239 */ 240static void 241add_pax_attr_time(struct archive_string *as, const char *key, 242 int64_t sec, unsigned long nanos) 243{ 244 int digit, i; 245 char *t; 246 /* 247 * Note that each byte contributes fewer than 3 base-10 248 * digits, so this will always be big enough. 249 */ 250 char tmp[1 + 3*sizeof(sec) + 1 + 3*sizeof(nanos)]; 251 252 tmp[sizeof(tmp) - 1] = 0; 253 t = tmp + sizeof(tmp) - 1; 254 255 /* Skip trailing zeros in the fractional part. */ 256 for (digit = 0, i = 10; i > 0 && digit == 0; i--) { 257 digit = nanos % 10; 258 nanos /= 10; 259 } 260 261 /* Only format the fraction if it's non-zero. */ 262 if (i > 0) { 263 while (i > 0) { 264 *--t = "0123456789"[digit]; 265 digit = nanos % 10; 266 nanos /= 10; 267 i--; 268 } 269 *--t = '.'; 270 } 271 t = format_int(t, sec); 272 273 add_pax_attr(as, key, t); 274} 275 276static char * 277format_int(char *t, int64_t i) 278{ 279 uint64_t ui; 280 281 if (i < 0) 282 ui = (i == INT64_MIN) ? (uint64_t)(INT64_MAX) + 1 : (uint64_t)(-i); 283 else 284 ui = i; 285 286 do { 287 *--t = "0123456789"[ui % 10]; 288 } while (ui /= 10); 289 if (i < 0) 290 *--t = '-'; 291 return (t); 292} 293 294static void 295add_pax_attr_int(struct archive_string *as, const char *key, int64_t value) 296{ 297 char tmp[1 + 3 * sizeof(value)]; 298 299 tmp[sizeof(tmp) - 1] = 0; 300 add_pax_attr(as, key, format_int(tmp + sizeof(tmp) - 1, value)); 301} 302 303/* 304 * Add a key/value attribute to the pax header. This function handles 305 * the length field and various other syntactic requirements. 306 */ 307static void 308add_pax_attr(struct archive_string *as, const char *key, const char *value) 309{ 310 add_pax_attr_binary(as, key, value, strlen(value)); 311} 312 313/* 314 * Add a key/value attribute to the pax header. This function handles 315 * binary values. 316 */ 317static void 318add_pax_attr_binary(struct archive_string *as, const char *key, 319 const char *value, size_t value_len) 320{ 321 int digits, i, len, next_ten; 322 char tmp[1 + 3 * sizeof(int)]; /* < 3 base-10 digits per byte */ 323 324 /*- 325 * PAX attributes have the following layout: 326 * <len> <space> <key> <=> <value> <nl> 327 */ 328 len = 1 + (int)strlen(key) + 1 + (int)value_len + 1; 329 330 /* 331 * The <len> field includes the length of the <len> field, so 332 * computing the correct length is tricky. I start by 333 * counting the number of base-10 digits in 'len' and 334 * computing the next higher power of 10. 335 */ 336 next_ten = 1; 337 digits = 0; 338 i = len; 339 while (i > 0) { 340 i = i / 10; 341 digits++; 342 next_ten = next_ten * 10; 343 } 344 /* 345 * For example, if string without the length field is 99 346 * chars, then adding the 2 digit length "99" will force the 347 * total length past 100, requiring an extra digit. The next 348 * statement adjusts for this effect. 349 */ 350 if (len + digits >= next_ten) 351 digits++; 352 353 /* Now, we have the right length so we can build the line. */ 354 tmp[sizeof(tmp) - 1] = 0; /* Null-terminate the work area. */ 355 archive_strcat(as, format_int(tmp + sizeof(tmp) - 1, len + digits)); 356 archive_strappend_char(as, ' '); 357 archive_strcat(as, key); 358 archive_strappend_char(as, '='); 359 archive_array_append(as, value, value_len); 360 archive_strappend_char(as, '\n'); 361} 362 363static void 364archive_write_pax_header_xattr(struct pax *pax, const char *encoded_name, 365 const void *value, size_t value_len) 366{ 367 struct archive_string s; 368 char *encoded_value; 369 370 if (pax->flags & WRITE_LIBARCHIVE_XATTR) { 371 encoded_value = base64_encode((const char *)value, value_len); 372 373 if (encoded_name != NULL && encoded_value != NULL) { 374 archive_string_init(&s); 375 archive_strcpy(&s, "LIBARCHIVE.xattr."); 376 archive_strcat(&s, encoded_name); 377 add_pax_attr(&(pax->pax_header), s.s, encoded_value); 378 archive_string_free(&s); 379 } 380 free(encoded_value); 381 } 382 if (pax->flags & WRITE_SCHILY_XATTR) { 383 archive_string_init(&s); 384 archive_strcpy(&s, "SCHILY.xattr."); 385 archive_strcat(&s, encoded_name); 386 add_pax_attr_binary(&(pax->pax_header), s.s, value, value_len); 387 archive_string_free(&s); 388 } 389} 390 391static int 392archive_write_pax_header_xattrs(struct archive_write *a, 393 struct pax *pax, struct archive_entry *entry) 394{ 395 int i = archive_entry_xattr_reset(entry); 396 397 while (i--) { 398 const char *name; 399 const void *value; 400 char *url_encoded_name = NULL, *encoded_name = NULL; 401 size_t size; 402 int r; 403 404 archive_entry_xattr_next(entry, &name, &value, &size); 405 url_encoded_name = url_encode(name); 406 if (url_encoded_name != NULL) { 407 /* Convert narrow-character to UTF-8. */ 408 r = archive_strcpy_l(&(pax->l_url_encoded_name), 409 url_encoded_name, pax->sconv_utf8); 410 free(url_encoded_name); /* Done with this. */ 411 if (r == 0) 412 encoded_name = pax->l_url_encoded_name.s; 413 else if (errno == ENOMEM) { 414 archive_set_error(&a->archive, ENOMEM, 415 "Can't allocate memory for Linkname"); 416 return (ARCHIVE_FATAL); 417 } 418 } 419 420 archive_write_pax_header_xattr(pax, encoded_name, 421 value, size); 422 423 } 424 return (ARCHIVE_OK); 425} 426 427static int 428get_entry_hardlink(struct archive_write *a, struct archive_entry *entry, 429 const char **name, size_t *length, struct archive_string_conv *sc) 430{ 431 int r; 432 433 r = archive_entry_hardlink_l(entry, name, length, sc); 434 if (r != 0) { 435 if (errno == ENOMEM) { 436 archive_set_error(&a->archive, ENOMEM, 437 "Can't allocate memory for Linkname"); 438 return (ARCHIVE_FATAL); 439 } 440 return (ARCHIVE_WARN); 441 } 442 return (ARCHIVE_OK); 443} 444 445static int 446get_entry_pathname(struct archive_write *a, struct archive_entry *entry, 447 const char **name, size_t *length, struct archive_string_conv *sc) 448{ 449 int r; 450 451 r = archive_entry_pathname_l(entry, name, length, sc); 452 if (r != 0) { 453 if (errno == ENOMEM) { 454 archive_set_error(&a->archive, ENOMEM, 455 "Can't allocate memory for Pathname"); 456 return (ARCHIVE_FATAL); 457 } 458 return (ARCHIVE_WARN); 459 } 460 return (ARCHIVE_OK); 461} 462 463static int 464get_entry_uname(struct archive_write *a, struct archive_entry *entry, 465 const char **name, size_t *length, struct archive_string_conv *sc) 466{ 467 int r; 468 469 r = archive_entry_uname_l(entry, name, length, sc); 470 if (r != 0) { 471 if (errno == ENOMEM) { 472 archive_set_error(&a->archive, ENOMEM, 473 "Can't allocate memory for Uname"); 474 return (ARCHIVE_FATAL); 475 } 476 return (ARCHIVE_WARN); 477 } 478 return (ARCHIVE_OK); 479} 480 481static int 482get_entry_gname(struct archive_write *a, struct archive_entry *entry, 483 const char **name, size_t *length, struct archive_string_conv *sc) 484{ 485 int r; 486 487 r = archive_entry_gname_l(entry, name, length, sc); 488 if (r != 0) { 489 if (errno == ENOMEM) { 490 archive_set_error(&a->archive, ENOMEM, 491 "Can't allocate memory for Gname"); 492 return (ARCHIVE_FATAL); 493 } 494 return (ARCHIVE_WARN); 495 } 496 return (ARCHIVE_OK); 497} 498 499static int 500get_entry_symlink(struct archive_write *a, struct archive_entry *entry, 501 const char **name, size_t *length, struct archive_string_conv *sc) 502{ 503 int r; 504 505 r = archive_entry_symlink_l(entry, name, length, sc); 506 if (r != 0) { 507 if (errno == ENOMEM) { 508 archive_set_error(&a->archive, ENOMEM, 509 "Can't allocate memory for Linkname"); 510 return (ARCHIVE_FATAL); 511 } 512 return (ARCHIVE_WARN); 513 } 514 return (ARCHIVE_OK); 515} 516 517/* Add ACL to pax header */ 518static int 519add_pax_acl(struct archive_write *a, 520 struct archive_entry *entry, struct pax *pax, int flags) 521{ 522 char *p; 523 const char *attr; 524 int acl_types; 525 526 acl_types = archive_entry_acl_types(entry); 527 528 if ((acl_types & ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) 529 attr = "SCHILY.acl.ace"; 530 else if ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) 531 attr = "SCHILY.acl.access"; 532 else if ((flags & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) 533 attr = "SCHILY.acl.default"; 534 else 535 return (ARCHIVE_FATAL); 536 537 p = archive_entry_acl_to_text_l(entry, NULL, flags, pax->sconv_utf8); 538 if (p == NULL) { 539 if (errno == ENOMEM) { 540 archive_set_error(&a->archive, ENOMEM, "%s %s", 541 "Can't allocate memory for ", attr); 542 return (ARCHIVE_FATAL); 543 } 544 archive_set_error(&a->archive, 545 ARCHIVE_ERRNO_FILE_FORMAT, "%s %s %s", 546 "Can't translate ", attr, " to UTF-8"); 547 return(ARCHIVE_WARN); 548 } else if (*p != '\0') { 549 add_pax_attr(&(pax->pax_header), 550 attr, p); 551 free(p); 552 } 553 return(ARCHIVE_OK); 554} 555 556/* 557 * TODO: Consider adding 'comment' and 'charset' fields to 558 * archive_entry so that clients can specify them. Also, consider 559 * adding generic key/value tags so clients can add arbitrary 560 * key/value data. 561 * 562 * TODO: Break up this 700-line function!!!! Yowza! 563 */ 564static int 565archive_write_pax_header(struct archive_write *a, 566 struct archive_entry *entry_original) 567{ 568 struct archive_entry *entry_main; 569 const char *p; 570 const char *suffix; 571 int need_extension, r, ret; 572 int acl_types; 573 int sparse_count; 574 uint64_t sparse_total, real_size; 575 struct pax *pax; 576 const char *hardlink; 577 const char *path = NULL, *linkpath = NULL; 578 const char *uname = NULL, *gname = NULL; 579 const void *mac_metadata; 580 size_t mac_metadata_size; 581 struct archive_string_conv *sconv; 582 size_t hardlink_length, path_length, linkpath_length; 583 size_t uname_length, gname_length; 584 585 char paxbuff[512]; 586 char ustarbuff[512]; 587 char ustar_entry_name[256]; 588 char pax_entry_name[256]; 589 char gnu_sparse_name[256]; 590 struct archive_string entry_name; 591 592 ret = ARCHIVE_OK; 593 need_extension = 0; 594 pax = (struct pax *)a->format_data; 595 596 /* Sanity check. */ 597 if (archive_entry_pathname(entry_original) == NULL) { 598 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 599 "Can't record entry in tar file without pathname"); 600 return (ARCHIVE_FAILED); 601 } 602 603 /* 604 * Choose a header encoding. 605 */ 606 if (pax->opt_binary) 607 sconv = NULL;/* Binary mode. */ 608 else { 609 /* Header encoding is UTF-8. */ 610 if (pax->sconv_utf8 == NULL) { 611 /* Initialize the string conversion object 612 * we must need */ 613 pax->sconv_utf8 = archive_string_conversion_to_charset( 614 &(a->archive), "UTF-8", 1); 615 if (pax->sconv_utf8 == NULL) 616 /* Couldn't allocate memory */ 617 return (ARCHIVE_FAILED); 618 } 619 sconv = pax->sconv_utf8; 620 } 621 622 r = get_entry_hardlink(a, entry_original, &hardlink, 623 &hardlink_length, sconv); 624 if (r == ARCHIVE_FATAL) 625 return (r); 626 else if (r != ARCHIVE_OK) { 627 r = get_entry_hardlink(a, entry_original, &hardlink, 628 &hardlink_length, NULL); 629 if (r == ARCHIVE_FATAL) 630 return (r); 631 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 632 "Can't translate linkname '%s' to %s", hardlink, 633 archive_string_conversion_charset_name(sconv)); 634 ret = ARCHIVE_WARN; 635 sconv = NULL;/* The header charset switches to binary mode. */ 636 } 637 638 /* Make sure this is a type of entry that we can handle here */ 639 if (hardlink == NULL) { 640 switch (archive_entry_filetype(entry_original)) { 641 case AE_IFBLK: 642 case AE_IFCHR: 643 case AE_IFIFO: 644 case AE_IFLNK: 645 case AE_IFREG: 646 break; 647 case AE_IFDIR: 648 { 649 /* 650 * Ensure a trailing '/'. Modify the original 651 * entry so the client sees the change. 652 */ 653#if defined(_WIN32) && !defined(__CYGWIN__) 654 const wchar_t *wp; 655 656 wp = archive_entry_pathname_w(entry_original); 657 if (wp != NULL && wp[wcslen(wp) -1] != L'/') { 658 struct archive_wstring ws; 659 660 archive_string_init(&ws); 661 path_length = wcslen(wp); 662 if (archive_wstring_ensure(&ws, 663 path_length + 2) == NULL) { 664 archive_set_error(&a->archive, ENOMEM, 665 "Can't allocate pax data"); 666 archive_wstring_free(&ws); 667 return(ARCHIVE_FATAL); 668 } 669 /* Should we keep '\' ? */ 670 if (wp[path_length -1] == L'\\') 671 path_length--; 672 archive_wstrncpy(&ws, wp, path_length); 673 archive_wstrappend_wchar(&ws, L'/'); 674 archive_entry_copy_pathname_w( 675 entry_original, ws.s); 676 archive_wstring_free(&ws); 677 p = NULL; 678 } else 679#endif 680 p = archive_entry_pathname(entry_original); 681 /* 682 * On Windows, this is a backup operation just in 683 * case getting WCS failed. On POSIX, this is a 684 * normal operation. 685 */ 686 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') { 687 struct archive_string as; 688 689 archive_string_init(&as); 690 path_length = strlen(p); 691 if (archive_string_ensure(&as, 692 path_length + 2) == NULL) { 693 archive_set_error(&a->archive, ENOMEM, 694 "Can't allocate pax data"); 695 archive_string_free(&as); 696 return(ARCHIVE_FATAL); 697 } 698#if defined(_WIN32) && !defined(__CYGWIN__) 699 /* NOTE: This might break the pathname 700 * if the current code page is CP932 and 701 * the pathname includes a character '\' 702 * as a part of its multibyte pathname. */ 703 if (p[strlen(p) -1] == '\\') 704 path_length--; 705 else 706#endif 707 archive_strncpy(&as, p, path_length); 708 archive_strappend_char(&as, '/'); 709 archive_entry_copy_pathname( 710 entry_original, as.s); 711 archive_string_free(&as); 712 } 713 break; 714 } 715 default: /* AE_IFSOCK and unknown */ 716 __archive_write_entry_filetype_unsupported( 717 &a->archive, entry_original, "pax"); 718 return (ARCHIVE_FAILED); 719 } 720 } 721 722 /* 723 * If Mac OS metadata blob is here, recurse to write that 724 * as a separate entry. This is really a pretty poor design: 725 * In particular, it doubles the overhead for long filenames. 726 * TODO: Help Apple folks design something better and figure 727 * out how to transition from this legacy format. 728 * 729 * Note that this code is present on every platform; clients 730 * on non-Mac are unlikely to ever provide this data, but 731 * applications that copy entries from one archive to another 732 * should not lose data just because the local filesystem 733 * can't store it. 734 */ 735 mac_metadata = 736 archive_entry_mac_metadata(entry_original, &mac_metadata_size); 737 if (mac_metadata != NULL) { 738 const char *oname; 739 char *name, *bname; 740 size_t name_length; 741 struct archive_entry *extra = archive_entry_new2(&a->archive); 742 743 oname = archive_entry_pathname(entry_original); 744 name_length = strlen(oname); 745 name = malloc(name_length + 3); 746 if (name == NULL || extra == NULL) { 747 /* XXX error message */ 748 archive_entry_free(extra); 749 free(name); 750 return (ARCHIVE_FAILED); 751 } 752 strcpy(name, oname); 753 /* Find last '/'; strip trailing '/' characters */ 754 bname = strrchr(name, '/'); 755 while (bname != NULL && bname[1] == '\0') { 756 *bname = '\0'; 757 bname = strrchr(name, '/'); 758 } 759 if (bname == NULL) { 760 memmove(name + 2, name, name_length + 1); 761 memmove(name, "._", 2); 762 } else { 763 bname += 1; 764 memmove(bname + 2, bname, strlen(bname) + 1); 765 memmove(bname, "._", 2); 766 } 767 archive_entry_copy_pathname(extra, name); 768 free(name); 769 770 archive_entry_set_size(extra, mac_metadata_size); 771 archive_entry_set_filetype(extra, AE_IFREG); 772 archive_entry_set_perm(extra, 773 archive_entry_perm(entry_original)); 774 archive_entry_set_mtime(extra, 775 archive_entry_mtime(entry_original), 776 archive_entry_mtime_nsec(entry_original)); 777 archive_entry_set_gid(extra, 778 archive_entry_gid(entry_original)); 779 archive_entry_set_gname(extra, 780 archive_entry_gname(entry_original)); 781 archive_entry_set_uid(extra, 782 archive_entry_uid(entry_original)); 783 archive_entry_set_uname(extra, 784 archive_entry_uname(entry_original)); 785 786 /* Recurse to write the special copyfile entry. */ 787 r = archive_write_pax_header(a, extra); 788 archive_entry_free(extra); 789 if (r < ARCHIVE_WARN) 790 return (r); 791 if (r < ret) 792 ret = r; 793 r = (int)archive_write_pax_data(a, mac_metadata, 794 mac_metadata_size); 795 if (r < ARCHIVE_WARN) 796 return (r); 797 if (r < ret) 798 ret = r; 799 r = archive_write_pax_finish_entry(a); 800 if (r < ARCHIVE_WARN) 801 return (r); 802 if (r < ret) 803 ret = r; 804 } 805 806 /* Copy entry so we can modify it as needed. */ 807#if defined(_WIN32) && !defined(__CYGWIN__) 808 /* Make sure the path separators in pathname, hardlink and symlink 809 * are all slash '/', not the Windows path separator '\'. */ 810 entry_main = __la_win_entry_in_posix_pathseparator(entry_original); 811 if (entry_main == entry_original) 812 entry_main = archive_entry_clone(entry_original); 813#else 814 entry_main = archive_entry_clone(entry_original); 815#endif 816 if (entry_main == NULL) { 817 archive_set_error(&a->archive, ENOMEM, 818 "Can't allocate pax data"); 819 return(ARCHIVE_FATAL); 820 } 821 archive_string_empty(&(pax->pax_header)); /* Blank our work area. */ 822 archive_string_empty(&(pax->sparse_map)); 823 sparse_total = 0; 824 sparse_list_clear(pax); 825 826 if (hardlink == NULL && 827 archive_entry_filetype(entry_main) == AE_IFREG) 828 sparse_count = archive_entry_sparse_reset(entry_main); 829 else 830 sparse_count = 0; 831 if (sparse_count) { 832 int64_t offset, length, last_offset = 0; 833 /* Get the last entry of sparse block. */ 834 while (archive_entry_sparse_next( 835 entry_main, &offset, &length) == ARCHIVE_OK) 836 last_offset = offset + length; 837 838 /* If the last sparse block does not reach the end of file, 839 * We have to add a empty sparse block as the last entry to 840 * manage storing file data. */ 841 if (last_offset < archive_entry_size(entry_main)) 842 archive_entry_sparse_add_entry(entry_main, 843 archive_entry_size(entry_main), 0); 844 sparse_count = archive_entry_sparse_reset(entry_main); 845 } 846 847 /* 848 * First, check the name fields and see if any of them 849 * require binary coding. If any of them does, then all of 850 * them do. 851 */ 852 r = get_entry_pathname(a, entry_main, &path, &path_length, sconv); 853 if (r == ARCHIVE_FATAL) { 854 archive_entry_free(entry_main); 855 return (r); 856 } else if (r != ARCHIVE_OK) { 857 r = get_entry_pathname(a, entry_main, &path, 858 &path_length, NULL); 859 if (r == ARCHIVE_FATAL) { 860 archive_entry_free(entry_main); 861 return (r); 862 } 863 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 864 "Can't translate pathname '%s' to %s", path, 865 archive_string_conversion_charset_name(sconv)); 866 ret = ARCHIVE_WARN; 867 sconv = NULL;/* The header charset switches to binary mode. */ 868 } 869 r = get_entry_uname(a, entry_main, &uname, &uname_length, sconv); 870 if (r == ARCHIVE_FATAL) { 871 archive_entry_free(entry_main); 872 return (r); 873 } else if (r != ARCHIVE_OK) { 874 r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL); 875 if (r == ARCHIVE_FATAL) { 876 archive_entry_free(entry_main); 877 return (r); 878 } 879 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 880 "Can't translate uname '%s' to %s", uname, 881 archive_string_conversion_charset_name(sconv)); 882 ret = ARCHIVE_WARN; 883 sconv = NULL;/* The header charset switches to binary mode. */ 884 } 885 r = get_entry_gname(a, entry_main, &gname, &gname_length, sconv); 886 if (r == ARCHIVE_FATAL) { 887 archive_entry_free(entry_main); 888 return (r); 889 } else if (r != ARCHIVE_OK) { 890 r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL); 891 if (r == ARCHIVE_FATAL) { 892 archive_entry_free(entry_main); 893 return (r); 894 } 895 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 896 "Can't translate gname '%s' to %s", gname, 897 archive_string_conversion_charset_name(sconv)); 898 ret = ARCHIVE_WARN; 899 sconv = NULL;/* The header charset switches to binary mode. */ 900 } 901 linkpath = hardlink; 902 linkpath_length = hardlink_length; 903 if (linkpath == NULL) { 904 r = get_entry_symlink(a, entry_main, &linkpath, 905 &linkpath_length, sconv); 906 if (r == ARCHIVE_FATAL) { 907 archive_entry_free(entry_main); 908 return (r); 909 } else if (r != ARCHIVE_OK) { 910 r = get_entry_symlink(a, entry_main, &linkpath, 911 &linkpath_length, NULL); 912 if (r == ARCHIVE_FATAL) { 913 archive_entry_free(entry_main); 914 return (r); 915 } 916 archive_set_error(&a->archive, 917 ARCHIVE_ERRNO_FILE_FORMAT, 918 "Can't translate linkname '%s' to %s", linkpath, 919 archive_string_conversion_charset_name(sconv)); 920 ret = ARCHIVE_WARN; 921 sconv = NULL; 922 } 923 } 924 925 /* If any string conversions failed, get all attributes 926 * in binary-mode. */ 927 if (sconv == NULL && !pax->opt_binary) { 928 if (hardlink != NULL) { 929 r = get_entry_hardlink(a, entry_main, &hardlink, 930 &hardlink_length, NULL); 931 if (r == ARCHIVE_FATAL) { 932 archive_entry_free(entry_main); 933 return (r); 934 } 935 linkpath = hardlink; 936 linkpath_length = hardlink_length; 937 } 938 r = get_entry_pathname(a, entry_main, &path, 939 &path_length, NULL); 940 if (r == ARCHIVE_FATAL) { 941 archive_entry_free(entry_main); 942 return (r); 943 } 944 r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL); 945 if (r == ARCHIVE_FATAL) { 946 archive_entry_free(entry_main); 947 return (r); 948 } 949 r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL); 950 if (r == ARCHIVE_FATAL) { 951 archive_entry_free(entry_main); 952 return (r); 953 } 954 } 955 956 /* Store the header encoding first, to be nice to readers. */ 957 if (sconv == NULL) 958 add_pax_attr(&(pax->pax_header), "hdrcharset", "BINARY"); 959 960 961 /* 962 * If name is too long, or has non-ASCII characters, add 963 * 'path' to pax extended attrs. (Note that an unconvertible 964 * name must have non-ASCII characters.) 965 */ 966 if (has_non_ASCII(path)) { 967 /* We have non-ASCII characters. */ 968 add_pax_attr(&(pax->pax_header), "path", path); 969 archive_entry_set_pathname(entry_main, 970 build_ustar_entry_name(ustar_entry_name, 971 path, path_length, NULL)); 972 need_extension = 1; 973 } else { 974 /* We have an all-ASCII path; we'd like to just store 975 * it in the ustar header if it will fit. Yes, this 976 * duplicates some of the logic in 977 * archive_write_set_format_ustar.c 978 */ 979 if (path_length <= 100) { 980 /* Fits in the old 100-char tar name field. */ 981 } else { 982 /* Find largest suffix that will fit. */ 983 /* Note: strlen() > 100, so strlen() - 100 - 1 >= 0 */ 984 suffix = strchr(path + path_length - 100 - 1, '/'); 985 /* Don't attempt an empty prefix. */ 986 if (suffix == path) 987 suffix = strchr(suffix + 1, '/'); 988 /* We can put it in the ustar header if it's 989 * all ASCII and it's either <= 100 characters 990 * or can be split at a '/' into a prefix <= 991 * 155 chars and a suffix <= 100 chars. (Note 992 * the strchr() above will return NULL exactly 993 * when the path can't be split.) 994 */ 995 if (suffix == NULL /* Suffix > 100 chars. */ 996 || suffix[1] == '\0' /* empty suffix */ 997 || suffix - path > 155) /* Prefix > 155 chars */ 998 { 999 add_pax_attr(&(pax->pax_header), "path", path); 1000 archive_entry_set_pathname(entry_main, 1001 build_ustar_entry_name(ustar_entry_name, 1002 path, path_length, NULL)); 1003 need_extension = 1; 1004 } 1005 } 1006 } 1007 1008 if (linkpath != NULL) { 1009 /* If link name is too long or has non-ASCII characters, add 1010 * 'linkpath' to pax extended attrs. */ 1011 if (linkpath_length > 100 || has_non_ASCII(linkpath)) { 1012 add_pax_attr(&(pax->pax_header), "linkpath", linkpath); 1013 if (linkpath_length > 100) { 1014 if (hardlink != NULL) 1015 archive_entry_set_hardlink(entry_main, 1016 "././@LongHardLink"); 1017 else 1018 archive_entry_set_symlink(entry_main, 1019 "././@LongSymLink"); 1020 } 1021 need_extension = 1; 1022 } 1023 } 1024 /* Save a pathname since it will be renamed if `entry_main` has 1025 * sparse blocks. */ 1026 archive_string_init(&entry_name); 1027 archive_strcpy(&entry_name, archive_entry_pathname(entry_main)); 1028 1029 /* If file size is too large, add 'size' to pax extended attrs. */ 1030 if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) { 1031 add_pax_attr_int(&(pax->pax_header), "size", 1032 archive_entry_size(entry_main)); 1033 need_extension = 1; 1034 } 1035 1036 /* If numeric GID is too large, add 'gid' to pax extended attrs. */ 1037 if ((unsigned int)archive_entry_gid(entry_main) >= (1 << 18)) { 1038 add_pax_attr_int(&(pax->pax_header), "gid", 1039 archive_entry_gid(entry_main)); 1040 need_extension = 1; 1041 } 1042 1043 /* If group name is too large or has non-ASCII characters, add 1044 * 'gname' to pax extended attrs. */ 1045 if (gname != NULL) { 1046 if (gname_length > 31 || has_non_ASCII(gname)) { 1047 add_pax_attr(&(pax->pax_header), "gname", gname); 1048 need_extension = 1; 1049 } 1050 } 1051 1052 /* If numeric UID is too large, add 'uid' to pax extended attrs. */ 1053 if ((unsigned int)archive_entry_uid(entry_main) >= (1 << 18)) { 1054 add_pax_attr_int(&(pax->pax_header), "uid", 1055 archive_entry_uid(entry_main)); 1056 need_extension = 1; 1057 } 1058 1059 /* Add 'uname' to pax extended attrs if necessary. */ 1060 if (uname != NULL) { 1061 if (uname_length > 31 || has_non_ASCII(uname)) { 1062 add_pax_attr(&(pax->pax_header), "uname", uname); 1063 need_extension = 1; 1064 } 1065 } 1066 1067 /* 1068 * POSIX/SUSv3 doesn't provide a standard key for large device 1069 * numbers. I use the same keys here that Joerg Schilling 1070 * used for 'star.' (Which, somewhat confusingly, are called 1071 * "devXXX" even though they code "rdev" values.) No doubt, 1072 * other implementations use other keys. Note that there's no 1073 * reason we can't write the same information into a number of 1074 * different keys. 1075 * 1076 * Of course, this is only needed for block or char device entries. 1077 */ 1078 if (archive_entry_filetype(entry_main) == AE_IFBLK 1079 || archive_entry_filetype(entry_main) == AE_IFCHR) { 1080 /* 1081 * If rdevmajor is too large, add 'SCHILY.devmajor' to 1082 * extended attributes. 1083 */ 1084 int rdevmajor, rdevminor; 1085 rdevmajor = archive_entry_rdevmajor(entry_main); 1086 rdevminor = archive_entry_rdevminor(entry_main); 1087 if (rdevmajor >= (1 << 18)) { 1088 add_pax_attr_int(&(pax->pax_header), "SCHILY.devmajor", 1089 rdevmajor); 1090 /* 1091 * Non-strict formatting below means we don't 1092 * have to truncate here. Not truncating improves 1093 * the chance that some more modern tar archivers 1094 * (such as GNU tar 1.13) can restore the full 1095 * value even if they don't understand the pax 1096 * extended attributes. See my rant below about 1097 * file size fields for additional details. 1098 */ 1099 /* archive_entry_set_rdevmajor(entry_main, 1100 rdevmajor & ((1 << 18) - 1)); */ 1101 need_extension = 1; 1102 } 1103 1104 /* 1105 * If devminor is too large, add 'SCHILY.devminor' to 1106 * extended attributes. 1107 */ 1108 if (rdevminor >= (1 << 18)) { 1109 add_pax_attr_int(&(pax->pax_header), "SCHILY.devminor", 1110 rdevminor); 1111 /* Truncation is not necessary here, either. */ 1112 /* archive_entry_set_rdevminor(entry_main, 1113 rdevminor & ((1 << 18) - 1)); */ 1114 need_extension = 1; 1115 } 1116 } 1117 1118 /* 1119 * Technically, the mtime field in the ustar header can 1120 * support 33 bits, but many platforms use signed 32-bit time 1121 * values. The cutoff of 0x7fffffff here is a compromise. 1122 * Yes, this check is duplicated just below; this helps to 1123 * avoid writing an mtime attribute just to handle a 1124 * high-resolution timestamp in "restricted pax" mode. 1125 */ 1126 if (!need_extension && 1127 ((archive_entry_mtime(entry_main) < 0) 1128 || (archive_entry_mtime(entry_main) >= 0x7fffffff))) 1129 need_extension = 1; 1130 1131 /* I use a star-compatible file flag attribute. */ 1132 p = archive_entry_fflags_text(entry_main); 1133 if (!need_extension && p != NULL && *p != '\0') 1134 need_extension = 1; 1135 1136 /* If there are extended attributes, we need an extension */ 1137 if (!need_extension && archive_entry_xattr_count(entry_original) > 0) 1138 need_extension = 1; 1139 1140 /* If there are sparse info, we need an extension */ 1141 if (!need_extension && sparse_count > 0) 1142 need_extension = 1; 1143 1144 acl_types = archive_entry_acl_types(entry_original); 1145 1146 /* If there are any ACL entries, we need an extension */ 1147 if (!need_extension && acl_types != 0) 1148 need_extension = 1; 1149 1150 /* If the symlink type is defined, we need an extension */ 1151 if (!need_extension && archive_entry_symlink_type(entry_main) > 0) 1152 need_extension = 1; 1153 1154 /* 1155 * Libarchive used to include these in extended headers for 1156 * restricted pax format, but that confused people who 1157 * expected ustar-like time semantics. So now we only include 1158 * them in full pax format. 1159 */ 1160 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED) { 1161 if (archive_entry_ctime(entry_main) != 0 || 1162 archive_entry_ctime_nsec(entry_main) != 0) 1163 add_pax_attr_time(&(pax->pax_header), "ctime", 1164 archive_entry_ctime(entry_main), 1165 archive_entry_ctime_nsec(entry_main)); 1166 1167 if (archive_entry_atime(entry_main) != 0 || 1168 archive_entry_atime_nsec(entry_main) != 0) 1169 add_pax_attr_time(&(pax->pax_header), "atime", 1170 archive_entry_atime(entry_main), 1171 archive_entry_atime_nsec(entry_main)); 1172 1173 /* Store birth/creationtime only if it's earlier than mtime */ 1174 if (archive_entry_birthtime_is_set(entry_main) && 1175 archive_entry_birthtime(entry_main) 1176 < archive_entry_mtime(entry_main)) 1177 add_pax_attr_time(&(pax->pax_header), 1178 "LIBARCHIVE.creationtime", 1179 archive_entry_birthtime(entry_main), 1180 archive_entry_birthtime_nsec(entry_main)); 1181 } 1182 1183 /* 1184 * The following items are handled differently in "pax 1185 * restricted" format. In particular, in "pax restricted" 1186 * format they won't be added unless need_extension is 1187 * already set (we're already generating an extended header, so 1188 * may as well include these). 1189 */ 1190 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED || 1191 need_extension) { 1192 if (archive_entry_mtime(entry_main) < 0 || 1193 archive_entry_mtime(entry_main) >= 0x7fffffff || 1194 archive_entry_mtime_nsec(entry_main) != 0) 1195 add_pax_attr_time(&(pax->pax_header), "mtime", 1196 archive_entry_mtime(entry_main), 1197 archive_entry_mtime_nsec(entry_main)); 1198 1199 /* I use a star-compatible file flag attribute. */ 1200 p = archive_entry_fflags_text(entry_main); 1201 if (p != NULL && *p != '\0') 1202 add_pax_attr(&(pax->pax_header), "SCHILY.fflags", p); 1203 1204 /* I use star-compatible ACL attributes. */ 1205 if ((acl_types & ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) { 1206 ret = add_pax_acl(a, entry_original, pax, 1207 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1208 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA | 1209 ARCHIVE_ENTRY_ACL_STYLE_COMPACT); 1210 if (ret == ARCHIVE_FATAL) { 1211 archive_entry_free(entry_main); 1212 archive_string_free(&entry_name); 1213 return (ARCHIVE_FATAL); 1214 } 1215 } 1216 if (acl_types & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) { 1217 ret = add_pax_acl(a, entry_original, pax, 1218 ARCHIVE_ENTRY_ACL_TYPE_ACCESS | 1219 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1220 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA); 1221 if (ret == ARCHIVE_FATAL) { 1222 archive_entry_free(entry_main); 1223 archive_string_free(&entry_name); 1224 return (ARCHIVE_FATAL); 1225 } 1226 } 1227 if (acl_types & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) { 1228 ret = add_pax_acl(a, entry_original, pax, 1229 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT | 1230 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1231 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA); 1232 if (ret == ARCHIVE_FATAL) { 1233 archive_entry_free(entry_main); 1234 archive_string_free(&entry_name); 1235 return (ARCHIVE_FATAL); 1236 } 1237 } 1238 1239 /* We use GNU-tar-compatible sparse attributes. */ 1240 if (sparse_count > 0) { 1241 int64_t soffset, slength; 1242 1243 add_pax_attr_int(&(pax->pax_header), 1244 "GNU.sparse.major", 1); 1245 add_pax_attr_int(&(pax->pax_header), 1246 "GNU.sparse.minor", 0); 1247 /* 1248 * Make sure to store the original path, since 1249 * truncation to ustar limit happened already. 1250 */ 1251 add_pax_attr(&(pax->pax_header), 1252 "GNU.sparse.name", path); 1253 add_pax_attr_int(&(pax->pax_header), 1254 "GNU.sparse.realsize", 1255 archive_entry_size(entry_main)); 1256 1257 /* Rename the file name which will be used for 1258 * ustar header to a special name, which GNU 1259 * PAX Format 1.0 requires */ 1260 archive_entry_set_pathname(entry_main, 1261 build_gnu_sparse_name(gnu_sparse_name, 1262 entry_name.s)); 1263 1264 /* 1265 * - Make a sparse map, which will precede a file data. 1266 * - Get the total size of available data of sparse. 1267 */ 1268 archive_string_sprintf(&(pax->sparse_map), "%d\n", 1269 sparse_count); 1270 while (archive_entry_sparse_next(entry_main, 1271 &soffset, &slength) == ARCHIVE_OK) { 1272 archive_string_sprintf(&(pax->sparse_map), 1273 "%jd\n%jd\n", 1274 (intmax_t)soffset, 1275 (intmax_t)slength); 1276 sparse_total += slength; 1277 if (sparse_list_add(pax, soffset, slength) 1278 != ARCHIVE_OK) { 1279 archive_set_error(&a->archive, 1280 ENOMEM, 1281 "Can't allocate memory"); 1282 archive_entry_free(entry_main); 1283 archive_string_free(&entry_name); 1284 return (ARCHIVE_FATAL); 1285 } 1286 } 1287 } 1288 1289 /* Store extended attributes */ 1290 if (archive_write_pax_header_xattrs(a, pax, entry_original) 1291 == ARCHIVE_FATAL) { 1292 archive_entry_free(entry_main); 1293 archive_string_free(&entry_name); 1294 return (ARCHIVE_FATAL); 1295 } 1296 1297 /* Store extended symlink information */ 1298 if (archive_entry_symlink_type(entry_main) == 1299 AE_SYMLINK_TYPE_FILE) { 1300 add_pax_attr(&(pax->pax_header), 1301 "LIBARCHIVE.symlinktype", "file"); 1302 } else if (archive_entry_symlink_type(entry_main) == 1303 AE_SYMLINK_TYPE_DIRECTORY) { 1304 add_pax_attr(&(pax->pax_header), 1305 "LIBARCHIVE.symlinktype", "dir"); 1306 } 1307 } 1308 1309 /* Only regular files have data. */ 1310 if (archive_entry_filetype(entry_main) != AE_IFREG) 1311 archive_entry_set_size(entry_main, 0); 1312 1313 /* 1314 * Pax-restricted does not store data for hardlinks, in order 1315 * to improve compatibility with ustar. 1316 */ 1317 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE && 1318 hardlink != NULL) 1319 archive_entry_set_size(entry_main, 0); 1320 1321 /* 1322 * XXX Full pax interchange format does permit a hardlink 1323 * entry to have data associated with it. I'm not supporting 1324 * that here because the client expects me to tell them whether 1325 * or not this format expects data for hardlinks. If I 1326 * don't check here, then every pax archive will end up with 1327 * duplicated data for hardlinks. Someday, there may be 1328 * need to select this behavior, in which case the following 1329 * will need to be revisited. XXX 1330 */ 1331 if (hardlink != NULL) 1332 archive_entry_set_size(entry_main, 0); 1333 1334 /* Save a real file size. */ 1335 real_size = archive_entry_size(entry_main); 1336 /* 1337 * Overwrite a file size by the total size of sparse blocks and 1338 * the size of sparse map info. That file size is the length of 1339 * the data, which we will exactly store into an archive file. 1340 */ 1341 if (archive_strlen(&(pax->sparse_map))) { 1342 size_t mapsize = archive_strlen(&(pax->sparse_map)); 1343 pax->sparse_map_padding = 0x1ff & (-(ssize_t)mapsize); 1344 archive_entry_set_size(entry_main, 1345 mapsize + pax->sparse_map_padding + sparse_total); 1346 } 1347 1348 /* Format 'ustar' header for main entry. 1349 * 1350 * The trouble with file size: If the reader can't understand 1351 * the file size, they may not be able to locate the next 1352 * entry and the rest of the archive is toast. Pax-compliant 1353 * readers are supposed to ignore the file size in the main 1354 * header, so the question becomes how to maximize portability 1355 * for readers that don't support pax attribute extensions. 1356 * For maximum compatibility, I permit numeric extensions in 1357 * the main header so that the file size stored will always be 1358 * correct, even if it's in a format that only some 1359 * implementations understand. The technique used here is: 1360 * 1361 * a) If possible, follow the standard exactly. This handles 1362 * files up to 8 gigabytes minus 1. 1363 * 1364 * b) If that fails, try octal but omit the field terminator. 1365 * That handles files up to 64 gigabytes minus 1. 1366 * 1367 * c) Otherwise, use base-256 extensions. That handles files 1368 * up to 2^63 in this implementation, with the potential to 1369 * go up to 2^94. That should hold us for a while. ;-) 1370 * 1371 * The non-strict formatter uses similar logic for other 1372 * numeric fields, though they're less critical. 1373 */ 1374 if (__archive_write_format_header_ustar(a, ustarbuff, entry_main, -1, 0, 1375 NULL) == ARCHIVE_FATAL) { 1376 archive_entry_free(entry_main); 1377 archive_string_free(&entry_name); 1378 return (ARCHIVE_FATAL); 1379 } 1380 1381 /* If we built any extended attributes, write that entry first. */ 1382 if (archive_strlen(&(pax->pax_header)) > 0) { 1383 struct archive_entry *pax_attr_entry; 1384 time_t s; 1385 int64_t uid, gid; 1386 int mode; 1387 1388 pax_attr_entry = archive_entry_new2(&a->archive); 1389 p = entry_name.s; 1390 archive_entry_set_pathname(pax_attr_entry, 1391 build_pax_attribute_name(pax_entry_name, p)); 1392 archive_entry_set_size(pax_attr_entry, 1393 archive_strlen(&(pax->pax_header))); 1394 /* Copy uid/gid (but clip to ustar limits). */ 1395 uid = archive_entry_uid(entry_main); 1396 if (uid >= 1 << 18) 1397 uid = (1 << 18) - 1; 1398 archive_entry_set_uid(pax_attr_entry, uid); 1399 gid = archive_entry_gid(entry_main); 1400 if (gid >= 1 << 18) 1401 gid = (1 << 18) - 1; 1402 archive_entry_set_gid(pax_attr_entry, gid); 1403 /* Copy mode over (but not setuid/setgid bits) */ 1404 mode = archive_entry_mode(entry_main); 1405#ifdef S_ISUID 1406 mode &= ~S_ISUID; 1407#endif 1408#ifdef S_ISGID 1409 mode &= ~S_ISGID; 1410#endif 1411#ifdef S_ISVTX 1412 mode &= ~S_ISVTX; 1413#endif 1414 archive_entry_set_mode(pax_attr_entry, mode); 1415 1416 /* Copy uname/gname. */ 1417 archive_entry_set_uname(pax_attr_entry, 1418 archive_entry_uname(entry_main)); 1419 archive_entry_set_gname(pax_attr_entry, 1420 archive_entry_gname(entry_main)); 1421 1422 /* Copy mtime, but clip to ustar limits. */ 1423 s = archive_entry_mtime(entry_main); 1424 if (s < 0) { s = 0; } 1425 if (s >= 0x7fffffff) { s = 0x7fffffff; } 1426 archive_entry_set_mtime(pax_attr_entry, s, 0); 1427 1428 /* Standard ustar doesn't support atime. */ 1429 archive_entry_set_atime(pax_attr_entry, 0, 0); 1430 1431 /* Standard ustar doesn't support ctime. */ 1432 archive_entry_set_ctime(pax_attr_entry, 0, 0); 1433 1434 r = __archive_write_format_header_ustar(a, paxbuff, 1435 pax_attr_entry, 'x', 1, NULL); 1436 1437 archive_entry_free(pax_attr_entry); 1438 1439 /* Note that the 'x' header shouldn't ever fail to format */ 1440 if (r < ARCHIVE_WARN) { 1441 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1442 "archive_write_pax_header: " 1443 "'x' header failed?! This can't happen.\n"); 1444 archive_entry_free(entry_main); 1445 archive_string_free(&entry_name); 1446 return (ARCHIVE_FATAL); 1447 } else if (r < ret) 1448 ret = r; 1449 r = __archive_write_output(a, paxbuff, 512); 1450 if (r != ARCHIVE_OK) { 1451 sparse_list_clear(pax); 1452 pax->entry_bytes_remaining = 0; 1453 pax->entry_padding = 0; 1454 archive_entry_free(entry_main); 1455 archive_string_free(&entry_name); 1456 return (ARCHIVE_FATAL); 1457 } 1458 1459 pax->entry_bytes_remaining = archive_strlen(&(pax->pax_header)); 1460 pax->entry_padding = 1461 0x1ff & (-(int64_t)pax->entry_bytes_remaining); 1462 1463 r = __archive_write_output(a, pax->pax_header.s, 1464 archive_strlen(&(pax->pax_header))); 1465 if (r != ARCHIVE_OK) { 1466 /* If a write fails, we're pretty much toast. */ 1467 archive_entry_free(entry_main); 1468 archive_string_free(&entry_name); 1469 return (ARCHIVE_FATAL); 1470 } 1471 /* Pad out the end of the entry. */ 1472 r = __archive_write_nulls(a, (size_t)pax->entry_padding); 1473 if (r != ARCHIVE_OK) { 1474 /* If a write fails, we're pretty much toast. */ 1475 archive_entry_free(entry_main); 1476 archive_string_free(&entry_name); 1477 return (ARCHIVE_FATAL); 1478 } 1479 pax->entry_bytes_remaining = pax->entry_padding = 0; 1480 } 1481 1482 /* Write the header for main entry. */ 1483 r = __archive_write_output(a, ustarbuff, 512); 1484 if (r != ARCHIVE_OK) { 1485 archive_entry_free(entry_main); 1486 archive_string_free(&entry_name); 1487 return (r); 1488 } 1489 1490 /* 1491 * Inform the client of the on-disk size we're using, so 1492 * they can avoid unnecessarily writing a body for something 1493 * that we're just going to ignore. 1494 */ 1495 archive_entry_set_size(entry_original, real_size); 1496 if (pax->sparse_list == NULL && real_size > 0) { 1497 /* This is not a sparse file but we handle its data as 1498 * a sparse block. */ 1499 sparse_list_add(pax, 0, real_size); 1500 sparse_total = real_size; 1501 } 1502 pax->entry_padding = 0x1ff & (-(int64_t)sparse_total); 1503 archive_entry_free(entry_main); 1504 archive_string_free(&entry_name); 1505 1506 return (ret); 1507} 1508 1509/* 1510 * We need a valid name for the regular 'ustar' entry. This routine 1511 * tries to hack something more-or-less reasonable. 1512 * 1513 * The approach here tries to preserve leading dir names. We do so by 1514 * working with four sections: 1515 * 1) "prefix" directory names, 1516 * 2) "suffix" directory names, 1517 * 3) inserted dir name (optional), 1518 * 4) filename. 1519 * 1520 * These sections must satisfy the following requirements: 1521 * * Parts 1 & 2 together form an initial portion of the dir name. 1522 * * Part 3 is specified by the caller. (It should not contain a leading 1523 * or trailing '/'.) 1524 * * Part 4 forms an initial portion of the base filename. 1525 * * The filename must be <= 99 chars to fit the ustar 'name' field. 1526 * * Parts 2, 3, 4 together must be <= 99 chars to fit the ustar 'name' fld. 1527 * * Part 1 must be <= 155 chars to fit the ustar 'prefix' field. 1528 * * If the original name ends in a '/', the new name must also end in a '/' 1529 * * Trailing '/.' sequences may be stripped. 1530 * 1531 * Note: Recall that the ustar format does not store the '/' separating 1532 * parts 1 & 2, but does store the '/' separating parts 2 & 3. 1533 */ 1534static char * 1535build_ustar_entry_name(char *dest, const char *src, size_t src_length, 1536 const char *insert) 1537{ 1538 const char *prefix, *prefix_end; 1539 const char *suffix, *suffix_end; 1540 const char *filename, *filename_end; 1541 char *p; 1542 int need_slash = 0; /* Was there a trailing slash? */ 1543 size_t suffix_length = 99; 1544 size_t insert_length; 1545 1546 /* Length of additional dir element to be added. */ 1547 if (insert == NULL) 1548 insert_length = 0; 1549 else 1550 /* +2 here allows for '/' before and after the insert. */ 1551 insert_length = strlen(insert) + 2; 1552 1553 /* Step 0: Quick bailout in a common case. */ 1554 if (src_length < 100 && insert == NULL) { 1555 strncpy(dest, src, src_length); 1556 dest[src_length] = '\0'; 1557 return (dest); 1558 } 1559 1560 /* Step 1: Locate filename and enforce the length restriction. */ 1561 filename_end = src + src_length; 1562 /* Remove trailing '/' chars and '/.' pairs. */ 1563 for (;;) { 1564 if (filename_end > src && filename_end[-1] == '/') { 1565 filename_end --; 1566 need_slash = 1; /* Remember to restore trailing '/'. */ 1567 continue; 1568 } 1569 if (filename_end > src + 1 && filename_end[-1] == '.' 1570 && filename_end[-2] == '/') { 1571 filename_end -= 2; 1572 need_slash = 1; /* "foo/." will become "foo/" */ 1573 continue; 1574 } 1575 break; 1576 } 1577 if (need_slash) 1578 suffix_length--; 1579 /* Find start of filename. */ 1580 filename = filename_end - 1; 1581 while ((filename > src) && (*filename != '/')) 1582 filename --; 1583 if ((*filename == '/') && (filename < filename_end - 1)) 1584 filename ++; 1585 /* Adjust filename_end so that filename + insert fits in 99 chars. */ 1586 suffix_length -= insert_length; 1587 if (filename_end > filename + suffix_length) 1588 filename_end = filename + suffix_length; 1589 /* Calculate max size for "suffix" section (#3 above). */ 1590 suffix_length -= filename_end - filename; 1591 1592 /* Step 2: Locate the "prefix" section of the dirname, including 1593 * trailing '/'. */ 1594 prefix = src; 1595 prefix_end = prefix + 155; 1596 if (prefix_end > filename) 1597 prefix_end = filename; 1598 while (prefix_end > prefix && *prefix_end != '/') 1599 prefix_end--; 1600 if ((prefix_end < filename) && (*prefix_end == '/')) 1601 prefix_end++; 1602 1603 /* Step 3: Locate the "suffix" section of the dirname, 1604 * including trailing '/'. */ 1605 suffix = prefix_end; 1606 suffix_end = suffix + suffix_length; /* Enforce limit. */ 1607 if (suffix_end > filename) 1608 suffix_end = filename; 1609 if (suffix_end < suffix) 1610 suffix_end = suffix; 1611 while (suffix_end > suffix && *suffix_end != '/') 1612 suffix_end--; 1613 if ((suffix_end < filename) && (*suffix_end == '/')) 1614 suffix_end++; 1615 1616 /* Step 4: Build the new name. */ 1617 /* The OpenBSD strlcpy function is safer, but less portable. */ 1618 /* Rather than maintain two versions, just use the strncpy version. */ 1619 p = dest; 1620 if (prefix_end > prefix) { 1621 strncpy(p, prefix, prefix_end - prefix); 1622 p += prefix_end - prefix; 1623 } 1624 if (suffix_end > suffix) { 1625 strncpy(p, suffix, suffix_end - suffix); 1626 p += suffix_end - suffix; 1627 } 1628 if (insert != NULL) { 1629 /* Note: assume insert does not have leading or trailing '/' */ 1630 strcpy(p, insert); 1631 p += strlen(insert); 1632 *p++ = '/'; 1633 } 1634 strncpy(p, filename, filename_end - filename); 1635 p += filename_end - filename; 1636 if (need_slash) 1637 *p++ = '/'; 1638 *p = '\0'; 1639 1640 return (dest); 1641} 1642 1643/* 1644 * The ustar header for the pax extended attributes must have a 1645 * reasonable name: SUSv3 requires 'dirname'/PaxHeader.'pid'/'filename' 1646 * where 'pid' is the PID of the archiving process. Unfortunately, 1647 * that makes testing a pain since the output varies for each run, 1648 * so I'm sticking with the simpler 'dirname'/PaxHeader/'filename' 1649 * for now. (Someday, I'll make this settable. Then I can use the 1650 * SUS recommendation as default and test harnesses can override it 1651 * to get predictable results.) 1652 * 1653 * Joerg Schilling has argued that this is unnecessary because, in 1654 * practice, if the pax extended attributes get extracted as regular 1655 * files, no one is going to bother reading those attributes to 1656 * manually restore them. Based on this, 'star' uses 1657 * /tmp/PaxHeader/'basename' as the ustar header name. This is a 1658 * tempting argument, in part because it's simpler than the SUSv3 1659 * recommendation, but I'm not entirely convinced. I'm also 1660 * uncomfortable with the fact that "/tmp" is a Unix-ism. 1661 * 1662 * The following routine leverages build_ustar_entry_name() above and 1663 * so is simpler than you might think. It just needs to provide the 1664 * additional path element and handle a few pathological cases). 1665 */ 1666static char * 1667build_pax_attribute_name(char *dest, const char *src) 1668{ 1669 char buff[64]; 1670 const char *p; 1671 1672 /* Handle the null filename case. */ 1673 if (src == NULL || *src == '\0') { 1674 strcpy(dest, "PaxHeader/blank"); 1675 return (dest); 1676 } 1677 1678 /* Prune final '/' and other unwanted final elements. */ 1679 p = src + strlen(src); 1680 for (;;) { 1681 /* Ends in "/", remove the '/' */ 1682 if (p > src && p[-1] == '/') { 1683 --p; 1684 continue; 1685 } 1686 /* Ends in "/.", remove the '.' */ 1687 if (p > src + 1 && p[-1] == '.' 1688 && p[-2] == '/') { 1689 --p; 1690 continue; 1691 } 1692 break; 1693 } 1694 1695 /* Pathological case: After above, there was nothing left. 1696 * This includes "/." "/./." "/.//./." etc. */ 1697 if (p == src) { 1698 strcpy(dest, "/PaxHeader/rootdir"); 1699 return (dest); 1700 } 1701 1702 /* Convert unadorned "." into a suitable filename. */ 1703 if (*src == '.' && p == src + 1) { 1704 strcpy(dest, "PaxHeader/currentdir"); 1705 return (dest); 1706 } 1707 1708 /* 1709 * TODO: Push this string into the 'pax' structure to avoid 1710 * recomputing it every time. That will also open the door 1711 * to having clients override it. 1712 */ 1713#if HAVE_GETPID && 0 /* Disable this for now; see above comment. */ 1714 sprintf(buff, "PaxHeader.%d", getpid()); 1715#else 1716 /* If the platform can't fetch the pid, don't include it. */ 1717 strcpy(buff, "PaxHeader"); 1718#endif 1719 /* General case: build a ustar-compatible name adding 1720 * "/PaxHeader/". */ 1721 build_ustar_entry_name(dest, src, p - src, buff); 1722 1723 return (dest); 1724} 1725 1726/* 1727 * GNU PAX Format 1.0 requires the special name, which pattern is: 1728 * <dir>/GNUSparseFile.<pid>/<original file name> 1729 * 1730 * Since reproducible archives are more important, use 0 as pid. 1731 * 1732 * This function is used for only Sparse file, a file type of which 1733 * is regular file. 1734 */ 1735static char * 1736build_gnu_sparse_name(char *dest, const char *src) 1737{ 1738 const char *p; 1739 1740 /* Handle the null filename case. */ 1741 if (src == NULL || *src == '\0') { 1742 strcpy(dest, "GNUSparseFile/blank"); 1743 return (dest); 1744 } 1745 1746 /* Prune final '/' and other unwanted final elements. */ 1747 p = src + strlen(src); 1748 for (;;) { 1749 /* Ends in "/", remove the '/' */ 1750 if (p > src && p[-1] == '/') { 1751 --p; 1752 continue; 1753 } 1754 /* Ends in "/.", remove the '.' */ 1755 if (p > src + 1 && p[-1] == '.' 1756 && p[-2] == '/') { 1757 --p; 1758 continue; 1759 } 1760 break; 1761 } 1762 1763 /* General case: build a ustar-compatible name adding 1764 * "/GNUSparseFile/". */ 1765 build_ustar_entry_name(dest, src, p - src, "GNUSparseFile.0"); 1766 1767 return (dest); 1768} 1769 1770/* Write two null blocks for the end of archive */ 1771static int 1772archive_write_pax_close(struct archive_write *a) 1773{ 1774 return (__archive_write_nulls(a, 512 * 2)); 1775} 1776 1777static int 1778archive_write_pax_free(struct archive_write *a) 1779{ 1780 struct pax *pax; 1781 1782 pax = (struct pax *)a->format_data; 1783 if (pax == NULL) 1784 return (ARCHIVE_OK); 1785 1786 archive_string_free(&pax->pax_header); 1787 archive_string_free(&pax->sparse_map); 1788 archive_string_free(&pax->l_url_encoded_name); 1789 sparse_list_clear(pax); 1790 free(pax); 1791 a->format_data = NULL; 1792 return (ARCHIVE_OK); 1793} 1794 1795static int 1796archive_write_pax_finish_entry(struct archive_write *a) 1797{ 1798 struct pax *pax; 1799 uint64_t remaining; 1800 int ret; 1801 1802 pax = (struct pax *)a->format_data; 1803 remaining = pax->entry_bytes_remaining; 1804 if (remaining == 0) { 1805 while (pax->sparse_list) { 1806 struct sparse_block *sb; 1807 if (!pax->sparse_list->is_hole) 1808 remaining += pax->sparse_list->remaining; 1809 sb = pax->sparse_list->next; 1810 free(pax->sparse_list); 1811 pax->sparse_list = sb; 1812 } 1813 } 1814 ret = __archive_write_nulls(a, (size_t)(remaining + pax->entry_padding)); 1815 pax->entry_bytes_remaining = pax->entry_padding = 0; 1816 return (ret); 1817} 1818 1819static ssize_t 1820archive_write_pax_data(struct archive_write *a, const void *buff, size_t s) 1821{ 1822 struct pax *pax; 1823 size_t ws; 1824 size_t total; 1825 int ret; 1826 1827 pax = (struct pax *)a->format_data; 1828 1829 /* 1830 * According to GNU PAX format 1.0, write a sparse map 1831 * before the body. 1832 */ 1833 if (archive_strlen(&(pax->sparse_map))) { 1834 ret = __archive_write_output(a, pax->sparse_map.s, 1835 archive_strlen(&(pax->sparse_map))); 1836 if (ret != ARCHIVE_OK) 1837 return (ret); 1838 ret = __archive_write_nulls(a, pax->sparse_map_padding); 1839 if (ret != ARCHIVE_OK) 1840 return (ret); 1841 archive_string_empty(&(pax->sparse_map)); 1842 } 1843 1844 total = 0; 1845 while (total < s) { 1846 const unsigned char *p; 1847 1848 while (pax->sparse_list != NULL && 1849 pax->sparse_list->remaining == 0) { 1850 struct sparse_block *sb = pax->sparse_list->next; 1851 free(pax->sparse_list); 1852 pax->sparse_list = sb; 1853 } 1854 1855 if (pax->sparse_list == NULL) 1856 return (total); 1857 1858 p = ((const unsigned char *)buff) + total; 1859 ws = s - total; 1860 if (ws > pax->sparse_list->remaining) 1861 ws = (size_t)pax->sparse_list->remaining; 1862 1863 if (pax->sparse_list->is_hole) { 1864 /* Current block is hole thus we do not write 1865 * the body. */ 1866 pax->sparse_list->remaining -= ws; 1867 total += ws; 1868 continue; 1869 } 1870 1871 ret = __archive_write_output(a, p, ws); 1872 pax->sparse_list->remaining -= ws; 1873 total += ws; 1874 if (ret != ARCHIVE_OK) 1875 return (ret); 1876 } 1877 return (total); 1878} 1879 1880static int 1881has_non_ASCII(const char *_p) 1882{ 1883 const unsigned char *p = (const unsigned char *)_p; 1884 1885 if (p == NULL) 1886 return (1); 1887 while (*p != '\0' && *p < 128) 1888 p++; 1889 return (*p != '\0'); 1890} 1891 1892/* 1893 * Used by extended attribute support; encodes the name 1894 * so that there will be no '=' characters in the result. 1895 */ 1896static char * 1897url_encode(const char *in) 1898{ 1899 const char *s; 1900 char *d; 1901 int out_len = 0; 1902 char *out; 1903 1904 for (s = in; *s != '\0'; s++) { 1905 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') 1906 out_len += 3; 1907 else 1908 out_len++; 1909 } 1910 1911 out = (char *)malloc(out_len + 1); 1912 if (out == NULL) 1913 return (NULL); 1914 1915 for (s = in, d = out; *s != '\0'; s++) { 1916 /* encode any non-printable ASCII character or '%' or '=' */ 1917 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') { 1918 /* URL encoding is '%' followed by two hex digits */ 1919 *d++ = '%'; 1920 *d++ = "0123456789ABCDEF"[0x0f & (*s >> 4)]; 1921 *d++ = "0123456789ABCDEF"[0x0f & *s]; 1922 } else { 1923 *d++ = *s; 1924 } 1925 } 1926 *d = '\0'; 1927 return (out); 1928} 1929 1930/* 1931 * Encode a sequence of bytes into a C string using base-64 encoding. 1932 * 1933 * Returns a null-terminated C string allocated with malloc(); caller 1934 * is responsible for freeing the result. 1935 */ 1936static char * 1937base64_encode(const char *s, size_t len) 1938{ 1939 static const char digits[64] = 1940 { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O', 1941 'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d', 1942 'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s', 1943 't','u','v','w','x','y','z','0','1','2','3','4','5','6','7', 1944 '8','9','+','/' }; 1945 int v; 1946 char *d, *out; 1947 1948 /* 3 bytes becomes 4 chars, but round up and allow for trailing NUL */ 1949 out = (char *)malloc((len * 4 + 2) / 3 + 1); 1950 if (out == NULL) 1951 return (NULL); 1952 d = out; 1953 1954 /* Convert each group of 3 bytes into 4 characters. */ 1955 while (len >= 3) { 1956 v = (((int)s[0] << 16) & 0xff0000) 1957 | (((int)s[1] << 8) & 0xff00) 1958 | (((int)s[2]) & 0x00ff); 1959 s += 3; 1960 len -= 3; 1961 *d++ = digits[(v >> 18) & 0x3f]; 1962 *d++ = digits[(v >> 12) & 0x3f]; 1963 *d++ = digits[(v >> 6) & 0x3f]; 1964 *d++ = digits[(v) & 0x3f]; 1965 } 1966 /* Handle final group of 1 byte (2 chars) or 2 bytes (3 chars). */ 1967 switch (len) { 1968 case 0: break; 1969 case 1: 1970 v = (((int)s[0] << 16) & 0xff0000); 1971 *d++ = digits[(v >> 18) & 0x3f]; 1972 *d++ = digits[(v >> 12) & 0x3f]; 1973 break; 1974 case 2: 1975 v = (((int)s[0] << 16) & 0xff0000) 1976 | (((int)s[1] << 8) & 0xff00); 1977 *d++ = digits[(v >> 18) & 0x3f]; 1978 *d++ = digits[(v >> 12) & 0x3f]; 1979 *d++ = digits[(v >> 6) & 0x3f]; 1980 break; 1981 } 1982 /* Add trailing NUL character so output is a valid C string. */ 1983 *d = '\0'; 1984 return (out); 1985} 1986 1987static void 1988sparse_list_clear(struct pax *pax) 1989{ 1990 while (pax->sparse_list != NULL) { 1991 struct sparse_block *sb = pax->sparse_list; 1992 pax->sparse_list = sb->next; 1993 free(sb); 1994 } 1995 pax->sparse_tail = NULL; 1996} 1997 1998static int 1999_sparse_list_add_block(struct pax *pax, int64_t offset, int64_t length, 2000 int is_hole) 2001{ 2002 struct sparse_block *sb; 2003 2004 sb = (struct sparse_block *)malloc(sizeof(*sb)); 2005 if (sb == NULL) 2006 return (ARCHIVE_FATAL); 2007 sb->next = NULL; 2008 sb->is_hole = is_hole; 2009 sb->offset = offset; 2010 sb->remaining = length; 2011 if (pax->sparse_list == NULL || pax->sparse_tail == NULL) 2012 pax->sparse_list = pax->sparse_tail = sb; 2013 else { 2014 pax->sparse_tail->next = sb; 2015 pax->sparse_tail = sb; 2016 } 2017 return (ARCHIVE_OK); 2018} 2019 2020static int 2021sparse_list_add(struct pax *pax, int64_t offset, int64_t length) 2022{ 2023 int64_t last_offset; 2024 int r; 2025 2026 if (pax->sparse_tail == NULL) 2027 last_offset = 0; 2028 else { 2029 last_offset = pax->sparse_tail->offset + 2030 pax->sparse_tail->remaining; 2031 } 2032 if (last_offset < offset) { 2033 /* Add a hole block. */ 2034 r = _sparse_list_add_block(pax, last_offset, 2035 offset - last_offset, 1); 2036 if (r != ARCHIVE_OK) 2037 return (r); 2038 } 2039 /* Add data block. */ 2040 return (_sparse_list_add_block(pax, offset, length, 0)); 2041} 2042 2043