archive_write_set_format_pax.c revision 348608
156067Smarkm/*- 256067Smarkm * Copyright (c) 2003-2007 Tim Kientzle 3139106Sru * Copyright (c) 2010-2012 Michihiro NAKAJIMA 456067Smarkm * Copyright (c) 2016 Martin Matuska 556067Smarkm * All rights reserved. 656067Smarkm * 7125491Sru * Redistribution and use in source and binary forms, with or without 856549Smarkm * modification, are permitted provided that the following conditions 9116536Smr * are met: 10116517Smr * 1. Redistributions of source code must retain the above copyright 11125261Sru * notice, this list of conditions and the following disclaimer. 12125261Sru * 2. Redistributions in binary form must reproduce the above copyright 13125261Sru * notice, this list of conditions and the following disclaimer in the 14125261Sru * documentation and/or other materials provided with the distribution. 15116517Smr * 16116517Smr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17117182Sru * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18117182Sru * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1956067Smarkm * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20125261Sru * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2156067Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22125261Sru * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23125261Sru * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24125261Sru * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25125261Sru * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26125261Sru */ 27125261Sru 28178828Sdfr#include "archive_platform.h" 29178828Sdfr__FBSDID("$FreeBSD: stable/10/contrib/libarchive/libarchive/archive_write_set_format_pax.c 348608 2019-06-04 10:36:26Z mm $"); 30178828Sdfr 31178828Sdfr#ifdef HAVE_ERRNO_H 3256067Smarkm#include <errno.h> 33125261Sru#endif 34125261Sru#ifdef HAVE_STDLIB_H 35125261Sru#include <stdlib.h> 36125261Sru#endif 37125261Sru#ifdef HAVE_STRING_H 38125261Sru#include <string.h> 39125261Sru#endif 40125261Sru 41125261Sru#include "archive.h" 42125261Sru#include "archive_entry.h" 4356067Smarkm#include "archive_entry_locale.h" 44145254Simp#include "archive_private.h" 45#include "archive_write_private.h" 46 47struct sparse_block { 48 struct sparse_block *next; 49 int is_hole; 50 uint64_t offset; 51 uint64_t remaining; 52}; 53 54struct pax { 55 uint64_t entry_bytes_remaining; 56 uint64_t entry_padding; 57 struct archive_string l_url_encoded_name; 58 struct archive_string pax_header; 59 struct archive_string sparse_map; 60 size_t sparse_map_padding; 61 struct sparse_block *sparse_list; 62 struct sparse_block *sparse_tail; 63 struct archive_string_conv *sconv_utf8; 64 int opt_binary; 65 66 unsigned flags; 67#define WRITE_SCHILY_XATTR (1 << 0) 68#define WRITE_LIBARCHIVE_XATTR (1 << 1) 69}; 70 71static void add_pax_attr(struct archive_string *, const char *key, 72 const char *value); 73static void add_pax_attr_binary(struct archive_string *, 74 const char *key, 75 const char *value, size_t value_len); 76static void add_pax_attr_int(struct archive_string *, 77 const char *key, int64_t value); 78static void add_pax_attr_time(struct archive_string *, 79 const char *key, int64_t sec, 80 unsigned long nanos); 81static int add_pax_acl(struct archive_write *, 82 struct archive_entry *, struct pax *, int); 83static ssize_t archive_write_pax_data(struct archive_write *, 84 const void *, size_t); 85static int archive_write_pax_close(struct archive_write *); 86static int archive_write_pax_free(struct archive_write *); 87static int archive_write_pax_finish_entry(struct archive_write *); 88static int archive_write_pax_header(struct archive_write *, 89 struct archive_entry *); 90static int archive_write_pax_options(struct archive_write *, 91 const char *, const char *); 92static char *base64_encode(const char *src, size_t len); 93static char *build_gnu_sparse_name(char *dest, const char *src); 94static char *build_pax_attribute_name(char *dest, const char *src); 95static char *build_ustar_entry_name(char *dest, const char *src, 96 size_t src_length, const char *insert); 97static char *format_int(char *dest, int64_t); 98static int has_non_ASCII(const char *); 99static void sparse_list_clear(struct pax *); 100static int sparse_list_add(struct pax *, int64_t, int64_t); 101static char *url_encode(const char *in); 102 103/* 104 * Set output format to 'restricted pax' format. 105 * 106 * This is the same as normal 'pax', but tries to suppress 107 * the pax header whenever possible. This is the default for 108 * bsdtar, for instance. 109 */ 110int 111archive_write_set_format_pax_restricted(struct archive *_a) 112{ 113 struct archive_write *a = (struct archive_write *)_a; 114 int r; 115 116 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 117 ARCHIVE_STATE_NEW, "archive_write_set_format_pax_restricted"); 118 119 r = archive_write_set_format_pax(&a->archive); 120 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 121 a->archive.archive_format_name = "restricted POSIX pax interchange"; 122 return (r); 123} 124 125/* 126 * Set output format to 'pax' format. 127 */ 128int 129archive_write_set_format_pax(struct archive *_a) 130{ 131 struct archive_write *a = (struct archive_write *)_a; 132 struct pax *pax; 133 134 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 135 ARCHIVE_STATE_NEW, "archive_write_set_format_pax"); 136 137 if (a->format_free != NULL) 138 (a->format_free)(a); 139 140 pax = (struct pax *)calloc(1, sizeof(*pax)); 141 if (pax == NULL) { 142 archive_set_error(&a->archive, ENOMEM, 143 "Can't allocate pax data"); 144 return (ARCHIVE_FATAL); 145 } 146 pax->flags = WRITE_LIBARCHIVE_XATTR | WRITE_SCHILY_XATTR; 147 148 a->format_data = pax; 149 a->format_name = "pax"; 150 a->format_options = archive_write_pax_options; 151 a->format_write_header = archive_write_pax_header; 152 a->format_write_data = archive_write_pax_data; 153 a->format_close = archive_write_pax_close; 154 a->format_free = archive_write_pax_free; 155 a->format_finish_entry = archive_write_pax_finish_entry; 156 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 157 a->archive.archive_format_name = "POSIX pax interchange"; 158 return (ARCHIVE_OK); 159} 160 161static int 162archive_write_pax_options(struct archive_write *a, const char *key, 163 const char *val) 164{ 165 struct pax *pax = (struct pax *)a->format_data; 166 int ret = ARCHIVE_FAILED; 167 168 if (strcmp(key, "hdrcharset") == 0) { 169 /* 170 * The character-set we can use are defined in 171 * IEEE Std 1003.1-2001 172 */ 173 if (val == NULL || val[0] == 0) 174 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 175 "pax: hdrcharset option needs a character-set name"); 176 else if (strcmp(val, "BINARY") == 0 || 177 strcmp(val, "binary") == 0) { 178 /* 179 * Specify binary mode. We will not convert 180 * filenames, uname and gname to any charsets. 181 */ 182 pax->opt_binary = 1; 183 ret = ARCHIVE_OK; 184 } else if (strcmp(val, "UTF-8") == 0) { 185 /* 186 * Specify UTF-8 character-set to be used for 187 * filenames. This is almost the test that 188 * running platform supports the string conversion. 189 * Especially libarchive_test needs this trick for 190 * its test. 191 */ 192 pax->sconv_utf8 = archive_string_conversion_to_charset( 193 &(a->archive), "UTF-8", 0); 194 if (pax->sconv_utf8 == NULL) 195 ret = ARCHIVE_FATAL; 196 else 197 ret = ARCHIVE_OK; 198 } else 199 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 200 "pax: invalid charset name"); 201 return (ret); 202 } 203 204 /* Note: The "warn" return is just to inform the options 205 * supervisor that we didn't handle it. It will generate 206 * a suitable error if no one used this option. */ 207 return (ARCHIVE_WARN); 208} 209 210/* 211 * Note: This code assumes that 'nanos' has the same sign as 'sec', 212 * which implies that sec=-1, nanos=200000000 represents -1.2 seconds 213 * and not -0.8 seconds. This is a pretty pedantic point, as we're 214 * unlikely to encounter many real files created before Jan 1, 1970, 215 * much less ones with timestamps recorded to sub-second resolution. 216 */ 217static void 218add_pax_attr_time(struct archive_string *as, const char *key, 219 int64_t sec, unsigned long nanos) 220{ 221 int digit, i; 222 char *t; 223 /* 224 * Note that each byte contributes fewer than 3 base-10 225 * digits, so this will always be big enough. 226 */ 227 char tmp[1 + 3*sizeof(sec) + 1 + 3*sizeof(nanos)]; 228 229 tmp[sizeof(tmp) - 1] = 0; 230 t = tmp + sizeof(tmp) - 1; 231 232 /* Skip trailing zeros in the fractional part. */ 233 for (digit = 0, i = 10; i > 0 && digit == 0; i--) { 234 digit = nanos % 10; 235 nanos /= 10; 236 } 237 238 /* Only format the fraction if it's non-zero. */ 239 if (i > 0) { 240 while (i > 0) { 241 *--t = "0123456789"[digit]; 242 digit = nanos % 10; 243 nanos /= 10; 244 i--; 245 } 246 *--t = '.'; 247 } 248 t = format_int(t, sec); 249 250 add_pax_attr(as, key, t); 251} 252 253static char * 254format_int(char *t, int64_t i) 255{ 256 uint64_t ui; 257 258 if (i < 0) 259 ui = (i == INT64_MIN) ? (uint64_t)(INT64_MAX) + 1 : (uint64_t)(-i); 260 else 261 ui = i; 262 263 do { 264 *--t = "0123456789"[ui % 10]; 265 } while (ui /= 10); 266 if (i < 0) 267 *--t = '-'; 268 return (t); 269} 270 271static void 272add_pax_attr_int(struct archive_string *as, const char *key, int64_t value) 273{ 274 char tmp[1 + 3 * sizeof(value)]; 275 276 tmp[sizeof(tmp) - 1] = 0; 277 add_pax_attr(as, key, format_int(tmp + sizeof(tmp) - 1, value)); 278} 279 280/* 281 * Add a key/value attribute to the pax header. This function handles 282 * the length field and various other syntactic requirements. 283 */ 284static void 285add_pax_attr(struct archive_string *as, const char *key, const char *value) 286{ 287 add_pax_attr_binary(as, key, value, strlen(value)); 288} 289 290/* 291 * Add a key/value attribute to the pax header. This function handles 292 * binary values. 293 */ 294static void 295add_pax_attr_binary(struct archive_string *as, const char *key, 296 const char *value, size_t value_len) 297{ 298 int digits, i, len, next_ten; 299 char tmp[1 + 3 * sizeof(int)]; /* < 3 base-10 digits per byte */ 300 301 /*- 302 * PAX attributes have the following layout: 303 * <len> <space> <key> <=> <value> <nl> 304 */ 305 len = 1 + (int)strlen(key) + 1 + (int)value_len + 1; 306 307 /* 308 * The <len> field includes the length of the <len> field, so 309 * computing the correct length is tricky. I start by 310 * counting the number of base-10 digits in 'len' and 311 * computing the next higher power of 10. 312 */ 313 next_ten = 1; 314 digits = 0; 315 i = len; 316 while (i > 0) { 317 i = i / 10; 318 digits++; 319 next_ten = next_ten * 10; 320 } 321 /* 322 * For example, if string without the length field is 99 323 * chars, then adding the 2 digit length "99" will force the 324 * total length past 100, requiring an extra digit. The next 325 * statement adjusts for this effect. 326 */ 327 if (len + digits >= next_ten) 328 digits++; 329 330 /* Now, we have the right length so we can build the line. */ 331 tmp[sizeof(tmp) - 1] = 0; /* Null-terminate the work area. */ 332 archive_strcat(as, format_int(tmp + sizeof(tmp) - 1, len + digits)); 333 archive_strappend_char(as, ' '); 334 archive_strcat(as, key); 335 archive_strappend_char(as, '='); 336 archive_array_append(as, value, value_len); 337 archive_strappend_char(as, '\n'); 338} 339 340static void 341archive_write_pax_header_xattr(struct pax *pax, const char *encoded_name, 342 const void *value, size_t value_len) 343{ 344 struct archive_string s; 345 char *encoded_value; 346 347 if (pax->flags & WRITE_LIBARCHIVE_XATTR) { 348 encoded_value = base64_encode((const char *)value, value_len); 349 350 if (encoded_name != NULL && encoded_value != NULL) { 351 archive_string_init(&s); 352 archive_strcpy(&s, "LIBARCHIVE.xattr."); 353 archive_strcat(&s, encoded_name); 354 add_pax_attr(&(pax->pax_header), s.s, encoded_value); 355 archive_string_free(&s); 356 } 357 free(encoded_value); 358 } 359 if (pax->flags & WRITE_SCHILY_XATTR) { 360 archive_string_init(&s); 361 archive_strcpy(&s, "SCHILY.xattr."); 362 archive_strcat(&s, encoded_name); 363 add_pax_attr_binary(&(pax->pax_header), s.s, value, value_len); 364 archive_string_free(&s); 365 } 366} 367 368static int 369archive_write_pax_header_xattrs(struct archive_write *a, 370 struct pax *pax, struct archive_entry *entry) 371{ 372 int i = archive_entry_xattr_reset(entry); 373 374 while (i--) { 375 const char *name; 376 const void *value; 377 char *url_encoded_name = NULL, *encoded_name = NULL; 378 size_t size; 379 int r; 380 381 archive_entry_xattr_next(entry, &name, &value, &size); 382 url_encoded_name = url_encode(name); 383 if (url_encoded_name != NULL) { 384 /* Convert narrow-character to UTF-8. */ 385 r = archive_strcpy_l(&(pax->l_url_encoded_name), 386 url_encoded_name, pax->sconv_utf8); 387 free(url_encoded_name); /* Done with this. */ 388 if (r == 0) 389 encoded_name = pax->l_url_encoded_name.s; 390 else if (errno == ENOMEM) { 391 archive_set_error(&a->archive, ENOMEM, 392 "Can't allocate memory for Linkname"); 393 return (ARCHIVE_FATAL); 394 } 395 } 396 397 archive_write_pax_header_xattr(pax, encoded_name, 398 value, size); 399 400 } 401 return (ARCHIVE_OK); 402} 403 404static int 405get_entry_hardlink(struct archive_write *a, struct archive_entry *entry, 406 const char **name, size_t *length, struct archive_string_conv *sc) 407{ 408 int r; 409 410 r = archive_entry_hardlink_l(entry, name, length, sc); 411 if (r != 0) { 412 if (errno == ENOMEM) { 413 archive_set_error(&a->archive, ENOMEM, 414 "Can't allocate memory for Linkname"); 415 return (ARCHIVE_FATAL); 416 } 417 return (ARCHIVE_WARN); 418 } 419 return (ARCHIVE_OK); 420} 421 422static int 423get_entry_pathname(struct archive_write *a, struct archive_entry *entry, 424 const char **name, size_t *length, struct archive_string_conv *sc) 425{ 426 int r; 427 428 r = archive_entry_pathname_l(entry, name, length, sc); 429 if (r != 0) { 430 if (errno == ENOMEM) { 431 archive_set_error(&a->archive, ENOMEM, 432 "Can't allocate memory for Pathname"); 433 return (ARCHIVE_FATAL); 434 } 435 return (ARCHIVE_WARN); 436 } 437 return (ARCHIVE_OK); 438} 439 440static int 441get_entry_uname(struct archive_write *a, struct archive_entry *entry, 442 const char **name, size_t *length, struct archive_string_conv *sc) 443{ 444 int r; 445 446 r = archive_entry_uname_l(entry, name, length, sc); 447 if (r != 0) { 448 if (errno == ENOMEM) { 449 archive_set_error(&a->archive, ENOMEM, 450 "Can't allocate memory for Uname"); 451 return (ARCHIVE_FATAL); 452 } 453 return (ARCHIVE_WARN); 454 } 455 return (ARCHIVE_OK); 456} 457 458static int 459get_entry_gname(struct archive_write *a, struct archive_entry *entry, 460 const char **name, size_t *length, struct archive_string_conv *sc) 461{ 462 int r; 463 464 r = archive_entry_gname_l(entry, name, length, sc); 465 if (r != 0) { 466 if (errno == ENOMEM) { 467 archive_set_error(&a->archive, ENOMEM, 468 "Can't allocate memory for Gname"); 469 return (ARCHIVE_FATAL); 470 } 471 return (ARCHIVE_WARN); 472 } 473 return (ARCHIVE_OK); 474} 475 476static int 477get_entry_symlink(struct archive_write *a, struct archive_entry *entry, 478 const char **name, size_t *length, struct archive_string_conv *sc) 479{ 480 int r; 481 482 r = archive_entry_symlink_l(entry, name, length, sc); 483 if (r != 0) { 484 if (errno == ENOMEM) { 485 archive_set_error(&a->archive, ENOMEM, 486 "Can't allocate memory for Linkname"); 487 return (ARCHIVE_FATAL); 488 } 489 return (ARCHIVE_WARN); 490 } 491 return (ARCHIVE_OK); 492} 493 494/* Add ACL to pax header */ 495static int 496add_pax_acl(struct archive_write *a, 497 struct archive_entry *entry, struct pax *pax, int flags) 498{ 499 char *p; 500 const char *attr; 501 int acl_types; 502 503 acl_types = archive_entry_acl_types(entry); 504 505 if ((acl_types & ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) 506 attr = "SCHILY.acl.ace"; 507 else if ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) 508 attr = "SCHILY.acl.access"; 509 else if ((flags & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) 510 attr = "SCHILY.acl.default"; 511 else 512 return (ARCHIVE_FATAL); 513 514 p = archive_entry_acl_to_text_l(entry, NULL, flags, pax->sconv_utf8); 515 if (p == NULL) { 516 if (errno == ENOMEM) { 517 archive_set_error(&a->archive, ENOMEM, "%s %s", 518 "Can't allocate memory for ", attr); 519 return (ARCHIVE_FATAL); 520 } 521 archive_set_error(&a->archive, 522 ARCHIVE_ERRNO_FILE_FORMAT, "%s %s %s", 523 "Can't translate ", attr, " to UTF-8"); 524 return(ARCHIVE_WARN); 525 } else if (*p != '\0') { 526 add_pax_attr(&(pax->pax_header), 527 attr, p); 528 free(p); 529 } 530 return(ARCHIVE_OK); 531} 532 533/* 534 * TODO: Consider adding 'comment' and 'charset' fields to 535 * archive_entry so that clients can specify them. Also, consider 536 * adding generic key/value tags so clients can add arbitrary 537 * key/value data. 538 * 539 * TODO: Break up this 700-line function!!!! Yowza! 540 */ 541static int 542archive_write_pax_header(struct archive_write *a, 543 struct archive_entry *entry_original) 544{ 545 struct archive_entry *entry_main; 546 const char *p; 547 const char *suffix; 548 int need_extension, r, ret; 549 int acl_types; 550 int sparse_count; 551 uint64_t sparse_total, real_size; 552 struct pax *pax; 553 const char *hardlink; 554 const char *path = NULL, *linkpath = NULL; 555 const char *uname = NULL, *gname = NULL; 556 const void *mac_metadata; 557 size_t mac_metadata_size; 558 struct archive_string_conv *sconv; 559 size_t hardlink_length, path_length, linkpath_length; 560 size_t uname_length, gname_length; 561 562 char paxbuff[512]; 563 char ustarbuff[512]; 564 char ustar_entry_name[256]; 565 char pax_entry_name[256]; 566 char gnu_sparse_name[256]; 567 struct archive_string entry_name; 568 569 ret = ARCHIVE_OK; 570 need_extension = 0; 571 pax = (struct pax *)a->format_data; 572 573 /* Sanity check. */ 574 if (archive_entry_pathname(entry_original) == NULL) { 575 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 576 "Can't record entry in tar file without pathname"); 577 return (ARCHIVE_FAILED); 578 } 579 580 /* 581 * Choose a header encoding. 582 */ 583 if (pax->opt_binary) 584 sconv = NULL;/* Binary mode. */ 585 else { 586 /* Header encoding is UTF-8. */ 587 if (pax->sconv_utf8 == NULL) { 588 /* Initialize the string conversion object 589 * we must need */ 590 pax->sconv_utf8 = archive_string_conversion_to_charset( 591 &(a->archive), "UTF-8", 1); 592 if (pax->sconv_utf8 == NULL) 593 /* Couldn't allocate memory */ 594 return (ARCHIVE_FAILED); 595 } 596 sconv = pax->sconv_utf8; 597 } 598 599 r = get_entry_hardlink(a, entry_original, &hardlink, 600 &hardlink_length, sconv); 601 if (r == ARCHIVE_FATAL) 602 return (r); 603 else if (r != ARCHIVE_OK) { 604 r = get_entry_hardlink(a, entry_original, &hardlink, 605 &hardlink_length, NULL); 606 if (r == ARCHIVE_FATAL) 607 return (r); 608 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 609 "Can't translate linkname '%s' to %s", hardlink, 610 archive_string_conversion_charset_name(sconv)); 611 ret = ARCHIVE_WARN; 612 sconv = NULL;/* The header charset switches to binary mode. */ 613 } 614 615 /* Make sure this is a type of entry that we can handle here */ 616 if (hardlink == NULL) { 617 switch (archive_entry_filetype(entry_original)) { 618 case AE_IFBLK: 619 case AE_IFCHR: 620 case AE_IFIFO: 621 case AE_IFLNK: 622 case AE_IFREG: 623 break; 624 case AE_IFDIR: 625 { 626 /* 627 * Ensure a trailing '/'. Modify the original 628 * entry so the client sees the change. 629 */ 630#if defined(_WIN32) && !defined(__CYGWIN__) 631 const wchar_t *wp; 632 633 wp = archive_entry_pathname_w(entry_original); 634 if (wp != NULL && wp[wcslen(wp) -1] != L'/') { 635 struct archive_wstring ws; 636 637 archive_string_init(&ws); 638 path_length = wcslen(wp); 639 if (archive_wstring_ensure(&ws, 640 path_length + 2) == NULL) { 641 archive_set_error(&a->archive, ENOMEM, 642 "Can't allocate pax data"); 643 archive_wstring_free(&ws); 644 return(ARCHIVE_FATAL); 645 } 646 /* Should we keep '\' ? */ 647 if (wp[path_length -1] == L'\\') 648 path_length--; 649 archive_wstrncpy(&ws, wp, path_length); 650 archive_wstrappend_wchar(&ws, L'/'); 651 archive_entry_copy_pathname_w( 652 entry_original, ws.s); 653 archive_wstring_free(&ws); 654 p = NULL; 655 } else 656#endif 657 p = archive_entry_pathname(entry_original); 658 /* 659 * On Windows, this is a backup operation just in 660 * case getting WCS failed. On POSIX, this is a 661 * normal operation. 662 */ 663 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') { 664 struct archive_string as; 665 666 archive_string_init(&as); 667 path_length = strlen(p); 668 if (archive_string_ensure(&as, 669 path_length + 2) == NULL) { 670 archive_set_error(&a->archive, ENOMEM, 671 "Can't allocate pax data"); 672 archive_string_free(&as); 673 return(ARCHIVE_FATAL); 674 } 675#if defined(_WIN32) && !defined(__CYGWIN__) 676 /* NOTE: This might break the pathname 677 * if the current code page is CP932 and 678 * the pathname includes a character '\' 679 * as a part of its multibyte pathname. */ 680 if (p[strlen(p) -1] == '\\') 681 path_length--; 682 else 683#endif 684 archive_strncpy(&as, p, path_length); 685 archive_strappend_char(&as, '/'); 686 archive_entry_copy_pathname( 687 entry_original, as.s); 688 archive_string_free(&as); 689 } 690 break; 691 } 692 case AE_IFSOCK: 693 archive_set_error(&a->archive, 694 ARCHIVE_ERRNO_FILE_FORMAT, 695 "tar format cannot archive socket"); 696 return (ARCHIVE_FAILED); 697 default: 698 archive_set_error(&a->archive, 699 ARCHIVE_ERRNO_FILE_FORMAT, 700 "tar format cannot archive this (type=0%lo)", 701 (unsigned long) 702 archive_entry_filetype(entry_original)); 703 return (ARCHIVE_FAILED); 704 } 705 } 706 707 /* 708 * If Mac OS metadata blob is here, recurse to write that 709 * as a separate entry. This is really a pretty poor design: 710 * In particular, it doubles the overhead for long filenames. 711 * TODO: Help Apple folks design something better and figure 712 * out how to transition from this legacy format. 713 * 714 * Note that this code is present on every platform; clients 715 * on non-Mac are unlikely to ever provide this data, but 716 * applications that copy entries from one archive to another 717 * should not lose data just because the local filesystem 718 * can't store it. 719 */ 720 mac_metadata = 721 archive_entry_mac_metadata(entry_original, &mac_metadata_size); 722 if (mac_metadata != NULL) { 723 const char *oname; 724 char *name, *bname; 725 size_t name_length; 726 struct archive_entry *extra = archive_entry_new2(&a->archive); 727 728 oname = archive_entry_pathname(entry_original); 729 name_length = strlen(oname); 730 name = malloc(name_length + 3); 731 if (name == NULL || extra == NULL) { 732 /* XXX error message */ 733 archive_entry_free(extra); 734 free(name); 735 return (ARCHIVE_FAILED); 736 } 737 strcpy(name, oname); 738 /* Find last '/'; strip trailing '/' characters */ 739 bname = strrchr(name, '/'); 740 while (bname != NULL && bname[1] == '\0') { 741 *bname = '\0'; 742 bname = strrchr(name, '/'); 743 } 744 if (bname == NULL) { 745 memmove(name + 2, name, name_length + 1); 746 memmove(name, "._", 2); 747 } else { 748 bname += 1; 749 memmove(bname + 2, bname, strlen(bname) + 1); 750 memmove(bname, "._", 2); 751 } 752 archive_entry_copy_pathname(extra, name); 753 free(name); 754 755 archive_entry_set_size(extra, mac_metadata_size); 756 archive_entry_set_filetype(extra, AE_IFREG); 757 archive_entry_set_perm(extra, 758 archive_entry_perm(entry_original)); 759 archive_entry_set_mtime(extra, 760 archive_entry_mtime(entry_original), 761 archive_entry_mtime_nsec(entry_original)); 762 archive_entry_set_gid(extra, 763 archive_entry_gid(entry_original)); 764 archive_entry_set_gname(extra, 765 archive_entry_gname(entry_original)); 766 archive_entry_set_uid(extra, 767 archive_entry_uid(entry_original)); 768 archive_entry_set_uname(extra, 769 archive_entry_uname(entry_original)); 770 771 /* Recurse to write the special copyfile entry. */ 772 r = archive_write_pax_header(a, extra); 773 archive_entry_free(extra); 774 if (r < ARCHIVE_WARN) 775 return (r); 776 if (r < ret) 777 ret = r; 778 r = (int)archive_write_pax_data(a, mac_metadata, 779 mac_metadata_size); 780 if (r < ARCHIVE_WARN) 781 return (r); 782 if (r < ret) 783 ret = r; 784 r = archive_write_pax_finish_entry(a); 785 if (r < ARCHIVE_WARN) 786 return (r); 787 if (r < ret) 788 ret = r; 789 } 790 791 /* Copy entry so we can modify it as needed. */ 792#if defined(_WIN32) && !defined(__CYGWIN__) 793 /* Make sure the path separators in pathname, hardlink and symlink 794 * are all slash '/', not the Windows path separator '\'. */ 795 entry_main = __la_win_entry_in_posix_pathseparator(entry_original); 796 if (entry_main == entry_original) 797 entry_main = archive_entry_clone(entry_original); 798#else 799 entry_main = archive_entry_clone(entry_original); 800#endif 801 if (entry_main == NULL) { 802 archive_set_error(&a->archive, ENOMEM, 803 "Can't allocate pax data"); 804 return(ARCHIVE_FATAL); 805 } 806 archive_string_empty(&(pax->pax_header)); /* Blank our work area. */ 807 archive_string_empty(&(pax->sparse_map)); 808 sparse_total = 0; 809 sparse_list_clear(pax); 810 811 if (hardlink == NULL && 812 archive_entry_filetype(entry_main) == AE_IFREG) 813 sparse_count = archive_entry_sparse_reset(entry_main); 814 else 815 sparse_count = 0; 816 if (sparse_count) { 817 int64_t offset, length, last_offset = 0; 818 /* Get the last entry of sparse block. */ 819 while (archive_entry_sparse_next( 820 entry_main, &offset, &length) == ARCHIVE_OK) 821 last_offset = offset + length; 822 823 /* If the last sparse block does not reach the end of file, 824 * We have to add a empty sparse block as the last entry to 825 * manage storing file data. */ 826 if (last_offset < archive_entry_size(entry_main)) 827 archive_entry_sparse_add_entry(entry_main, 828 archive_entry_size(entry_main), 0); 829 sparse_count = archive_entry_sparse_reset(entry_main); 830 } 831 832 /* 833 * First, check the name fields and see if any of them 834 * require binary coding. If any of them does, then all of 835 * them do. 836 */ 837 r = get_entry_pathname(a, entry_main, &path, &path_length, sconv); 838 if (r == ARCHIVE_FATAL) 839 return (r); 840 else if (r != ARCHIVE_OK) { 841 r = get_entry_pathname(a, entry_main, &path, 842 &path_length, NULL); 843 if (r == ARCHIVE_FATAL) 844 return (r); 845 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 846 "Can't translate pathname '%s' to %s", path, 847 archive_string_conversion_charset_name(sconv)); 848 ret = ARCHIVE_WARN; 849 sconv = NULL;/* The header charset switches to binary mode. */ 850 } 851 r = get_entry_uname(a, entry_main, &uname, &uname_length, sconv); 852 if (r == ARCHIVE_FATAL) 853 return (r); 854 else if (r != ARCHIVE_OK) { 855 r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL); 856 if (r == ARCHIVE_FATAL) 857 return (r); 858 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 859 "Can't translate uname '%s' to %s", uname, 860 archive_string_conversion_charset_name(sconv)); 861 ret = ARCHIVE_WARN; 862 sconv = NULL;/* The header charset switches to binary mode. */ 863 } 864 r = get_entry_gname(a, entry_main, &gname, &gname_length, sconv); 865 if (r == ARCHIVE_FATAL) 866 return (r); 867 else if (r != ARCHIVE_OK) { 868 r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL); 869 if (r == ARCHIVE_FATAL) 870 return (r); 871 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 872 "Can't translate gname '%s' to %s", gname, 873 archive_string_conversion_charset_name(sconv)); 874 ret = ARCHIVE_WARN; 875 sconv = NULL;/* The header charset switches to binary mode. */ 876 } 877 linkpath = hardlink; 878 linkpath_length = hardlink_length; 879 if (linkpath == NULL) { 880 r = get_entry_symlink(a, entry_main, &linkpath, 881 &linkpath_length, sconv); 882 if (r == ARCHIVE_FATAL) 883 return (r); 884 else if (r != ARCHIVE_OK) { 885 r = get_entry_symlink(a, entry_main, &linkpath, 886 &linkpath_length, NULL); 887 if (r == ARCHIVE_FATAL) 888 return (r); 889 archive_set_error(&a->archive, 890 ARCHIVE_ERRNO_FILE_FORMAT, 891 "Can't translate linkname '%s' to %s", linkpath, 892 archive_string_conversion_charset_name(sconv)); 893 ret = ARCHIVE_WARN; 894 sconv = NULL; 895 } 896 } 897 898 /* If any string conversions failed, get all attributes 899 * in binary-mode. */ 900 if (sconv == NULL && !pax->opt_binary) { 901 if (hardlink != NULL) { 902 r = get_entry_hardlink(a, entry_main, &hardlink, 903 &hardlink_length, NULL); 904 if (r == ARCHIVE_FATAL) 905 return (r); 906 linkpath = hardlink; 907 linkpath_length = hardlink_length; 908 } 909 r = get_entry_pathname(a, entry_main, &path, 910 &path_length, NULL); 911 if (r == ARCHIVE_FATAL) 912 return (r); 913 r = get_entry_uname(a, entry_main, &uname, &uname_length, NULL); 914 if (r == ARCHIVE_FATAL) 915 return (r); 916 r = get_entry_gname(a, entry_main, &gname, &gname_length, NULL); 917 if (r == ARCHIVE_FATAL) 918 return (r); 919 } 920 921 /* Store the header encoding first, to be nice to readers. */ 922 if (sconv == NULL) 923 add_pax_attr(&(pax->pax_header), "hdrcharset", "BINARY"); 924 925 926 /* 927 * If name is too long, or has non-ASCII characters, add 928 * 'path' to pax extended attrs. (Note that an unconvertible 929 * name must have non-ASCII characters.) 930 */ 931 if (has_non_ASCII(path)) { 932 /* We have non-ASCII characters. */ 933 add_pax_attr(&(pax->pax_header), "path", path); 934 archive_entry_set_pathname(entry_main, 935 build_ustar_entry_name(ustar_entry_name, 936 path, path_length, NULL)); 937 need_extension = 1; 938 } else { 939 /* We have an all-ASCII path; we'd like to just store 940 * it in the ustar header if it will fit. Yes, this 941 * duplicates some of the logic in 942 * archive_write_set_format_ustar.c 943 */ 944 if (path_length <= 100) { 945 /* Fits in the old 100-char tar name field. */ 946 } else { 947 /* Find largest suffix that will fit. */ 948 /* Note: strlen() > 100, so strlen() - 100 - 1 >= 0 */ 949 suffix = strchr(path + path_length - 100 - 1, '/'); 950 /* Don't attempt an empty prefix. */ 951 if (suffix == path) 952 suffix = strchr(suffix + 1, '/'); 953 /* We can put it in the ustar header if it's 954 * all ASCII and it's either <= 100 characters 955 * or can be split at a '/' into a prefix <= 956 * 155 chars and a suffix <= 100 chars. (Note 957 * the strchr() above will return NULL exactly 958 * when the path can't be split.) 959 */ 960 if (suffix == NULL /* Suffix > 100 chars. */ 961 || suffix[1] == '\0' /* empty suffix */ 962 || suffix - path > 155) /* Prefix > 155 chars */ 963 { 964 add_pax_attr(&(pax->pax_header), "path", path); 965 archive_entry_set_pathname(entry_main, 966 build_ustar_entry_name(ustar_entry_name, 967 path, path_length, NULL)); 968 need_extension = 1; 969 } 970 } 971 } 972 973 if (linkpath != NULL) { 974 /* If link name is too long or has non-ASCII characters, add 975 * 'linkpath' to pax extended attrs. */ 976 if (linkpath_length > 100 || has_non_ASCII(linkpath)) { 977 add_pax_attr(&(pax->pax_header), "linkpath", linkpath); 978 if (linkpath_length > 100) { 979 if (hardlink != NULL) 980 archive_entry_set_hardlink(entry_main, 981 "././@LongHardLink"); 982 else 983 archive_entry_set_symlink(entry_main, 984 "././@LongSymLink"); 985 } 986 need_extension = 1; 987 } 988 } 989 /* Save a pathname since it will be renamed if `entry_main` has 990 * sparse blocks. */ 991 archive_string_init(&entry_name); 992 archive_strcpy(&entry_name, archive_entry_pathname(entry_main)); 993 994 /* If file size is too large, add 'size' to pax extended attrs. */ 995 if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) { 996 add_pax_attr_int(&(pax->pax_header), "size", 997 archive_entry_size(entry_main)); 998 need_extension = 1; 999 } 1000 1001 /* If numeric GID is too large, add 'gid' to pax extended attrs. */ 1002 if ((unsigned int)archive_entry_gid(entry_main) >= (1 << 18)) { 1003 add_pax_attr_int(&(pax->pax_header), "gid", 1004 archive_entry_gid(entry_main)); 1005 need_extension = 1; 1006 } 1007 1008 /* If group name is too large or has non-ASCII characters, add 1009 * 'gname' to pax extended attrs. */ 1010 if (gname != NULL) { 1011 if (gname_length > 31 || has_non_ASCII(gname)) { 1012 add_pax_attr(&(pax->pax_header), "gname", gname); 1013 need_extension = 1; 1014 } 1015 } 1016 1017 /* If numeric UID is too large, add 'uid' to pax extended attrs. */ 1018 if ((unsigned int)archive_entry_uid(entry_main) >= (1 << 18)) { 1019 add_pax_attr_int(&(pax->pax_header), "uid", 1020 archive_entry_uid(entry_main)); 1021 need_extension = 1; 1022 } 1023 1024 /* Add 'uname' to pax extended attrs if necessary. */ 1025 if (uname != NULL) { 1026 if (uname_length > 31 || has_non_ASCII(uname)) { 1027 add_pax_attr(&(pax->pax_header), "uname", uname); 1028 need_extension = 1; 1029 } 1030 } 1031 1032 /* 1033 * POSIX/SUSv3 doesn't provide a standard key for large device 1034 * numbers. I use the same keys here that Joerg Schilling 1035 * used for 'star.' (Which, somewhat confusingly, are called 1036 * "devXXX" even though they code "rdev" values.) No doubt, 1037 * other implementations use other keys. Note that there's no 1038 * reason we can't write the same information into a number of 1039 * different keys. 1040 * 1041 * Of course, this is only needed for block or char device entries. 1042 */ 1043 if (archive_entry_filetype(entry_main) == AE_IFBLK 1044 || archive_entry_filetype(entry_main) == AE_IFCHR) { 1045 /* 1046 * If rdevmajor is too large, add 'SCHILY.devmajor' to 1047 * extended attributes. 1048 */ 1049 int rdevmajor, rdevminor; 1050 rdevmajor = archive_entry_rdevmajor(entry_main); 1051 rdevminor = archive_entry_rdevminor(entry_main); 1052 if (rdevmajor >= (1 << 18)) { 1053 add_pax_attr_int(&(pax->pax_header), "SCHILY.devmajor", 1054 rdevmajor); 1055 /* 1056 * Non-strict formatting below means we don't 1057 * have to truncate here. Not truncating improves 1058 * the chance that some more modern tar archivers 1059 * (such as GNU tar 1.13) can restore the full 1060 * value even if they don't understand the pax 1061 * extended attributes. See my rant below about 1062 * file size fields for additional details. 1063 */ 1064 /* archive_entry_set_rdevmajor(entry_main, 1065 rdevmajor & ((1 << 18) - 1)); */ 1066 need_extension = 1; 1067 } 1068 1069 /* 1070 * If devminor is too large, add 'SCHILY.devminor' to 1071 * extended attributes. 1072 */ 1073 if (rdevminor >= (1 << 18)) { 1074 add_pax_attr_int(&(pax->pax_header), "SCHILY.devminor", 1075 rdevminor); 1076 /* Truncation is not necessary here, either. */ 1077 /* archive_entry_set_rdevminor(entry_main, 1078 rdevminor & ((1 << 18) - 1)); */ 1079 need_extension = 1; 1080 } 1081 } 1082 1083 /* 1084 * Technically, the mtime field in the ustar header can 1085 * support 33 bits, but many platforms use signed 32-bit time 1086 * values. The cutoff of 0x7fffffff here is a compromise. 1087 * Yes, this check is duplicated just below; this helps to 1088 * avoid writing an mtime attribute just to handle a 1089 * high-resolution timestamp in "restricted pax" mode. 1090 */ 1091 if (!need_extension && 1092 ((archive_entry_mtime(entry_main) < 0) 1093 || (archive_entry_mtime(entry_main) >= 0x7fffffff))) 1094 need_extension = 1; 1095 1096 /* I use a star-compatible file flag attribute. */ 1097 p = archive_entry_fflags_text(entry_main); 1098 if (!need_extension && p != NULL && *p != '\0') 1099 need_extension = 1; 1100 1101 /* If there are extended attributes, we need an extension */ 1102 if (!need_extension && archive_entry_xattr_count(entry_original) > 0) 1103 need_extension = 1; 1104 1105 /* If there are sparse info, we need an extension */ 1106 if (!need_extension && sparse_count > 0) 1107 need_extension = 1; 1108 1109 acl_types = archive_entry_acl_types(entry_original); 1110 1111 /* If there are any ACL entries, we need an extension */ 1112 if (!need_extension && acl_types != 0) 1113 need_extension = 1; 1114 1115 /* If the symlink type is defined, we need an extension */ 1116 if (!need_extension && archive_entry_symlink_type(entry_main) > 0) 1117 need_extension = 1; 1118 1119 /* 1120 * Libarchive used to include these in extended headers for 1121 * restricted pax format, but that confused people who 1122 * expected ustar-like time semantics. So now we only include 1123 * them in full pax format. 1124 */ 1125 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED) { 1126 if (archive_entry_ctime(entry_main) != 0 || 1127 archive_entry_ctime_nsec(entry_main) != 0) 1128 add_pax_attr_time(&(pax->pax_header), "ctime", 1129 archive_entry_ctime(entry_main), 1130 archive_entry_ctime_nsec(entry_main)); 1131 1132 if (archive_entry_atime(entry_main) != 0 || 1133 archive_entry_atime_nsec(entry_main) != 0) 1134 add_pax_attr_time(&(pax->pax_header), "atime", 1135 archive_entry_atime(entry_main), 1136 archive_entry_atime_nsec(entry_main)); 1137 1138 /* Store birth/creationtime only if it's earlier than mtime */ 1139 if (archive_entry_birthtime_is_set(entry_main) && 1140 archive_entry_birthtime(entry_main) 1141 < archive_entry_mtime(entry_main)) 1142 add_pax_attr_time(&(pax->pax_header), 1143 "LIBARCHIVE.creationtime", 1144 archive_entry_birthtime(entry_main), 1145 archive_entry_birthtime_nsec(entry_main)); 1146 } 1147 1148 /* 1149 * The following items are handled differently in "pax 1150 * restricted" format. In particular, in "pax restricted" 1151 * format they won't be added unless need_extension is 1152 * already set (we're already generating an extended header, so 1153 * may as well include these). 1154 */ 1155 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED || 1156 need_extension) { 1157 if (archive_entry_mtime(entry_main) < 0 || 1158 archive_entry_mtime(entry_main) >= 0x7fffffff || 1159 archive_entry_mtime_nsec(entry_main) != 0) 1160 add_pax_attr_time(&(pax->pax_header), "mtime", 1161 archive_entry_mtime(entry_main), 1162 archive_entry_mtime_nsec(entry_main)); 1163 1164 /* I use a star-compatible file flag attribute. */ 1165 p = archive_entry_fflags_text(entry_main); 1166 if (p != NULL && *p != '\0') 1167 add_pax_attr(&(pax->pax_header), "SCHILY.fflags", p); 1168 1169 /* I use star-compatible ACL attributes. */ 1170 if ((acl_types & ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) { 1171 ret = add_pax_acl(a, entry_original, pax, 1172 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1173 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA | 1174 ARCHIVE_ENTRY_ACL_STYLE_COMPACT); 1175 if (ret == ARCHIVE_FATAL) 1176 return (ARCHIVE_FATAL); 1177 } 1178 if (acl_types & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) { 1179 ret = add_pax_acl(a, entry_original, pax, 1180 ARCHIVE_ENTRY_ACL_TYPE_ACCESS | 1181 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1182 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA); 1183 if (ret == ARCHIVE_FATAL) 1184 return (ARCHIVE_FATAL); 1185 } 1186 if (acl_types & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) { 1187 ret = add_pax_acl(a, entry_original, pax, 1188 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT | 1189 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID | 1190 ARCHIVE_ENTRY_ACL_STYLE_SEPARATOR_COMMA); 1191 if (ret == ARCHIVE_FATAL) 1192 return (ARCHIVE_FATAL); 1193 } 1194 1195 /* We use GNU-tar-compatible sparse attributes. */ 1196 if (sparse_count > 0) { 1197 int64_t soffset, slength; 1198 1199 add_pax_attr_int(&(pax->pax_header), 1200 "GNU.sparse.major", 1); 1201 add_pax_attr_int(&(pax->pax_header), 1202 "GNU.sparse.minor", 0); 1203 /* 1204 * Make sure to store the original path, since 1205 * truncation to ustar limit happened already. 1206 */ 1207 add_pax_attr(&(pax->pax_header), 1208 "GNU.sparse.name", path); 1209 add_pax_attr_int(&(pax->pax_header), 1210 "GNU.sparse.realsize", 1211 archive_entry_size(entry_main)); 1212 1213 /* Rename the file name which will be used for 1214 * ustar header to a special name, which GNU 1215 * PAX Format 1.0 requires */ 1216 archive_entry_set_pathname(entry_main, 1217 build_gnu_sparse_name(gnu_sparse_name, 1218 entry_name.s)); 1219 1220 /* 1221 * - Make a sparse map, which will precede a file data. 1222 * - Get the total size of available data of sparse. 1223 */ 1224 archive_string_sprintf(&(pax->sparse_map), "%d\n", 1225 sparse_count); 1226 while (archive_entry_sparse_next(entry_main, 1227 &soffset, &slength) == ARCHIVE_OK) { 1228 archive_string_sprintf(&(pax->sparse_map), 1229 "%jd\n%jd\n", 1230 (intmax_t)soffset, 1231 (intmax_t)slength); 1232 sparse_total += slength; 1233 if (sparse_list_add(pax, soffset, slength) 1234 != ARCHIVE_OK) { 1235 archive_set_error(&a->archive, 1236 ENOMEM, 1237 "Can't allocate memory"); 1238 archive_entry_free(entry_main); 1239 archive_string_free(&entry_name); 1240 return (ARCHIVE_FATAL); 1241 } 1242 } 1243 } 1244 1245 /* Store extended attributes */ 1246 if (archive_write_pax_header_xattrs(a, pax, entry_original) 1247 == ARCHIVE_FATAL) { 1248 archive_entry_free(entry_main); 1249 archive_string_free(&entry_name); 1250 return (ARCHIVE_FATAL); 1251 } 1252 1253 /* Store extended symlink information */ 1254 if (archive_entry_symlink_type(entry_main) == 1255 AE_SYMLINK_TYPE_FILE) { 1256 add_pax_attr(&(pax->pax_header), 1257 "LIBARCHIVE.symlinktype", "file"); 1258 } else if (archive_entry_symlink_type(entry_main) == 1259 AE_SYMLINK_TYPE_DIRECTORY) { 1260 add_pax_attr(&(pax->pax_header), 1261 "LIBARCHIVE.symlinktype", "dir"); 1262 } 1263 } 1264 1265 /* Only regular files have data. */ 1266 if (archive_entry_filetype(entry_main) != AE_IFREG) 1267 archive_entry_set_size(entry_main, 0); 1268 1269 /* 1270 * Pax-restricted does not store data for hardlinks, in order 1271 * to improve compatibility with ustar. 1272 */ 1273 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE && 1274 hardlink != NULL) 1275 archive_entry_set_size(entry_main, 0); 1276 1277 /* 1278 * XXX Full pax interchange format does permit a hardlink 1279 * entry to have data associated with it. I'm not supporting 1280 * that here because the client expects me to tell them whether 1281 * or not this format expects data for hardlinks. If I 1282 * don't check here, then every pax archive will end up with 1283 * duplicated data for hardlinks. Someday, there may be 1284 * need to select this behavior, in which case the following 1285 * will need to be revisited. XXX 1286 */ 1287 if (hardlink != NULL) 1288 archive_entry_set_size(entry_main, 0); 1289 1290 /* Save a real file size. */ 1291 real_size = archive_entry_size(entry_main); 1292 /* 1293 * Overwrite a file size by the total size of sparse blocks and 1294 * the size of sparse map info. That file size is the length of 1295 * the data, which we will exactly store into an archive file. 1296 */ 1297 if (archive_strlen(&(pax->sparse_map))) { 1298 size_t mapsize = archive_strlen(&(pax->sparse_map)); 1299 pax->sparse_map_padding = 0x1ff & (-(ssize_t)mapsize); 1300 archive_entry_set_size(entry_main, 1301 mapsize + pax->sparse_map_padding + sparse_total); 1302 } 1303 1304 /* Format 'ustar' header for main entry. 1305 * 1306 * The trouble with file size: If the reader can't understand 1307 * the file size, they may not be able to locate the next 1308 * entry and the rest of the archive is toast. Pax-compliant 1309 * readers are supposed to ignore the file size in the main 1310 * header, so the question becomes how to maximize portability 1311 * for readers that don't support pax attribute extensions. 1312 * For maximum compatibility, I permit numeric extensions in 1313 * the main header so that the file size stored will always be 1314 * correct, even if it's in a format that only some 1315 * implementations understand. The technique used here is: 1316 * 1317 * a) If possible, follow the standard exactly. This handles 1318 * files up to 8 gigabytes minus 1. 1319 * 1320 * b) If that fails, try octal but omit the field terminator. 1321 * That handles files up to 64 gigabytes minus 1. 1322 * 1323 * c) Otherwise, use base-256 extensions. That handles files 1324 * up to 2^63 in this implementation, with the potential to 1325 * go up to 2^94. That should hold us for a while. ;-) 1326 * 1327 * The non-strict formatter uses similar logic for other 1328 * numeric fields, though they're less critical. 1329 */ 1330 if (__archive_write_format_header_ustar(a, ustarbuff, entry_main, -1, 0, 1331 NULL) == ARCHIVE_FATAL) 1332 return (ARCHIVE_FATAL); 1333 1334 /* If we built any extended attributes, write that entry first. */ 1335 if (archive_strlen(&(pax->pax_header)) > 0) { 1336 struct archive_entry *pax_attr_entry; 1337 time_t s; 1338 int64_t uid, gid; 1339 int mode; 1340 1341 pax_attr_entry = archive_entry_new2(&a->archive); 1342 p = entry_name.s; 1343 archive_entry_set_pathname(pax_attr_entry, 1344 build_pax_attribute_name(pax_entry_name, p)); 1345 archive_entry_set_size(pax_attr_entry, 1346 archive_strlen(&(pax->pax_header))); 1347 /* Copy uid/gid (but clip to ustar limits). */ 1348 uid = archive_entry_uid(entry_main); 1349 if (uid >= 1 << 18) 1350 uid = (1 << 18) - 1; 1351 archive_entry_set_uid(pax_attr_entry, uid); 1352 gid = archive_entry_gid(entry_main); 1353 if (gid >= 1 << 18) 1354 gid = (1 << 18) - 1; 1355 archive_entry_set_gid(pax_attr_entry, gid); 1356 /* Copy mode over (but not setuid/setgid bits) */ 1357 mode = archive_entry_mode(entry_main); 1358#ifdef S_ISUID 1359 mode &= ~S_ISUID; 1360#endif 1361#ifdef S_ISGID 1362 mode &= ~S_ISGID; 1363#endif 1364#ifdef S_ISVTX 1365 mode &= ~S_ISVTX; 1366#endif 1367 archive_entry_set_mode(pax_attr_entry, mode); 1368 1369 /* Copy uname/gname. */ 1370 archive_entry_set_uname(pax_attr_entry, 1371 archive_entry_uname(entry_main)); 1372 archive_entry_set_gname(pax_attr_entry, 1373 archive_entry_gname(entry_main)); 1374 1375 /* Copy mtime, but clip to ustar limits. */ 1376 s = archive_entry_mtime(entry_main); 1377 if (s < 0) { s = 0; } 1378 if (s >= 0x7fffffff) { s = 0x7fffffff; } 1379 archive_entry_set_mtime(pax_attr_entry, s, 0); 1380 1381 /* Standard ustar doesn't support atime. */ 1382 archive_entry_set_atime(pax_attr_entry, 0, 0); 1383 1384 /* Standard ustar doesn't support ctime. */ 1385 archive_entry_set_ctime(pax_attr_entry, 0, 0); 1386 1387 r = __archive_write_format_header_ustar(a, paxbuff, 1388 pax_attr_entry, 'x', 1, NULL); 1389 1390 archive_entry_free(pax_attr_entry); 1391 1392 /* Note that the 'x' header shouldn't ever fail to format */ 1393 if (r < ARCHIVE_WARN) { 1394 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 1395 "archive_write_pax_header: " 1396 "'x' header failed?! This can't happen.\n"); 1397 return (ARCHIVE_FATAL); 1398 } else if (r < ret) 1399 ret = r; 1400 r = __archive_write_output(a, paxbuff, 512); 1401 if (r != ARCHIVE_OK) { 1402 sparse_list_clear(pax); 1403 pax->entry_bytes_remaining = 0; 1404 pax->entry_padding = 0; 1405 return (ARCHIVE_FATAL); 1406 } 1407 1408 pax->entry_bytes_remaining = archive_strlen(&(pax->pax_header)); 1409 pax->entry_padding = 1410 0x1ff & (-(int64_t)pax->entry_bytes_remaining); 1411 1412 r = __archive_write_output(a, pax->pax_header.s, 1413 archive_strlen(&(pax->pax_header))); 1414 if (r != ARCHIVE_OK) { 1415 /* If a write fails, we're pretty much toast. */ 1416 return (ARCHIVE_FATAL); 1417 } 1418 /* Pad out the end of the entry. */ 1419 r = __archive_write_nulls(a, (size_t)pax->entry_padding); 1420 if (r != ARCHIVE_OK) { 1421 /* If a write fails, we're pretty much toast. */ 1422 return (ARCHIVE_FATAL); 1423 } 1424 pax->entry_bytes_remaining = pax->entry_padding = 0; 1425 } 1426 1427 /* Write the header for main entry. */ 1428 r = __archive_write_output(a, ustarbuff, 512); 1429 if (r != ARCHIVE_OK) 1430 return (r); 1431 1432 /* 1433 * Inform the client of the on-disk size we're using, so 1434 * they can avoid unnecessarily writing a body for something 1435 * that we're just going to ignore. 1436 */ 1437 archive_entry_set_size(entry_original, real_size); 1438 if (pax->sparse_list == NULL && real_size > 0) { 1439 /* This is not a sparse file but we handle its data as 1440 * a sparse block. */ 1441 sparse_list_add(pax, 0, real_size); 1442 sparse_total = real_size; 1443 } 1444 pax->entry_padding = 0x1ff & (-(int64_t)sparse_total); 1445 archive_entry_free(entry_main); 1446 archive_string_free(&entry_name); 1447 1448 return (ret); 1449} 1450 1451/* 1452 * We need a valid name for the regular 'ustar' entry. This routine 1453 * tries to hack something more-or-less reasonable. 1454 * 1455 * The approach here tries to preserve leading dir names. We do so by 1456 * working with four sections: 1457 * 1) "prefix" directory names, 1458 * 2) "suffix" directory names, 1459 * 3) inserted dir name (optional), 1460 * 4) filename. 1461 * 1462 * These sections must satisfy the following requirements: 1463 * * Parts 1 & 2 together form an initial portion of the dir name. 1464 * * Part 3 is specified by the caller. (It should not contain a leading 1465 * or trailing '/'.) 1466 * * Part 4 forms an initial portion of the base filename. 1467 * * The filename must be <= 99 chars to fit the ustar 'name' field. 1468 * * Parts 2, 3, 4 together must be <= 99 chars to fit the ustar 'name' fld. 1469 * * Part 1 must be <= 155 chars to fit the ustar 'prefix' field. 1470 * * If the original name ends in a '/', the new name must also end in a '/' 1471 * * Trailing '/.' sequences may be stripped. 1472 * 1473 * Note: Recall that the ustar format does not store the '/' separating 1474 * parts 1 & 2, but does store the '/' separating parts 2 & 3. 1475 */ 1476static char * 1477build_ustar_entry_name(char *dest, const char *src, size_t src_length, 1478 const char *insert) 1479{ 1480 const char *prefix, *prefix_end; 1481 const char *suffix, *suffix_end; 1482 const char *filename, *filename_end; 1483 char *p; 1484 int need_slash = 0; /* Was there a trailing slash? */ 1485 size_t suffix_length = 99; 1486 size_t insert_length; 1487 1488 /* Length of additional dir element to be added. */ 1489 if (insert == NULL) 1490 insert_length = 0; 1491 else 1492 /* +2 here allows for '/' before and after the insert. */ 1493 insert_length = strlen(insert) + 2; 1494 1495 /* Step 0: Quick bailout in a common case. */ 1496 if (src_length < 100 && insert == NULL) { 1497 strncpy(dest, src, src_length); 1498 dest[src_length] = '\0'; 1499 return (dest); 1500 } 1501 1502 /* Step 1: Locate filename and enforce the length restriction. */ 1503 filename_end = src + src_length; 1504 /* Remove trailing '/' chars and '/.' pairs. */ 1505 for (;;) { 1506 if (filename_end > src && filename_end[-1] == '/') { 1507 filename_end --; 1508 need_slash = 1; /* Remember to restore trailing '/'. */ 1509 continue; 1510 } 1511 if (filename_end > src + 1 && filename_end[-1] == '.' 1512 && filename_end[-2] == '/') { 1513 filename_end -= 2; 1514 need_slash = 1; /* "foo/." will become "foo/" */ 1515 continue; 1516 } 1517 break; 1518 } 1519 if (need_slash) 1520 suffix_length--; 1521 /* Find start of filename. */ 1522 filename = filename_end - 1; 1523 while ((filename > src) && (*filename != '/')) 1524 filename --; 1525 if ((*filename == '/') && (filename < filename_end - 1)) 1526 filename ++; 1527 /* Adjust filename_end so that filename + insert fits in 99 chars. */ 1528 suffix_length -= insert_length; 1529 if (filename_end > filename + suffix_length) 1530 filename_end = filename + suffix_length; 1531 /* Calculate max size for "suffix" section (#3 above). */ 1532 suffix_length -= filename_end - filename; 1533 1534 /* Step 2: Locate the "prefix" section of the dirname, including 1535 * trailing '/'. */ 1536 prefix = src; 1537 prefix_end = prefix + 155; 1538 if (prefix_end > filename) 1539 prefix_end = filename; 1540 while (prefix_end > prefix && *prefix_end != '/') 1541 prefix_end--; 1542 if ((prefix_end < filename) && (*prefix_end == '/')) 1543 prefix_end++; 1544 1545 /* Step 3: Locate the "suffix" section of the dirname, 1546 * including trailing '/'. */ 1547 suffix = prefix_end; 1548 suffix_end = suffix + suffix_length; /* Enforce limit. */ 1549 if (suffix_end > filename) 1550 suffix_end = filename; 1551 if (suffix_end < suffix) 1552 suffix_end = suffix; 1553 while (suffix_end > suffix && *suffix_end != '/') 1554 suffix_end--; 1555 if ((suffix_end < filename) && (*suffix_end == '/')) 1556 suffix_end++; 1557 1558 /* Step 4: Build the new name. */ 1559 /* The OpenBSD strlcpy function is safer, but less portable. */ 1560 /* Rather than maintain two versions, just use the strncpy version. */ 1561 p = dest; 1562 if (prefix_end > prefix) { 1563 strncpy(p, prefix, prefix_end - prefix); 1564 p += prefix_end - prefix; 1565 } 1566 if (suffix_end > suffix) { 1567 strncpy(p, suffix, suffix_end - suffix); 1568 p += suffix_end - suffix; 1569 } 1570 if (insert != NULL) { 1571 /* Note: assume insert does not have leading or trailing '/' */ 1572 strcpy(p, insert); 1573 p += strlen(insert); 1574 *p++ = '/'; 1575 } 1576 strncpy(p, filename, filename_end - filename); 1577 p += filename_end - filename; 1578 if (need_slash) 1579 *p++ = '/'; 1580 *p = '\0'; 1581 1582 return (dest); 1583} 1584 1585/* 1586 * The ustar header for the pax extended attributes must have a 1587 * reasonable name: SUSv3 requires 'dirname'/PaxHeader.'pid'/'filename' 1588 * where 'pid' is the PID of the archiving process. Unfortunately, 1589 * that makes testing a pain since the output varies for each run, 1590 * so I'm sticking with the simpler 'dirname'/PaxHeader/'filename' 1591 * for now. (Someday, I'll make this settable. Then I can use the 1592 * SUS recommendation as default and test harnesses can override it 1593 * to get predictable results.) 1594 * 1595 * Joerg Schilling has argued that this is unnecessary because, in 1596 * practice, if the pax extended attributes get extracted as regular 1597 * files, no one is going to bother reading those attributes to 1598 * manually restore them. Based on this, 'star' uses 1599 * /tmp/PaxHeader/'basename' as the ustar header name. This is a 1600 * tempting argument, in part because it's simpler than the SUSv3 1601 * recommendation, but I'm not entirely convinced. I'm also 1602 * uncomfortable with the fact that "/tmp" is a Unix-ism. 1603 * 1604 * The following routine leverages build_ustar_entry_name() above and 1605 * so is simpler than you might think. It just needs to provide the 1606 * additional path element and handle a few pathological cases). 1607 */ 1608static char * 1609build_pax_attribute_name(char *dest, const char *src) 1610{ 1611 char buff[64]; 1612 const char *p; 1613 1614 /* Handle the null filename case. */ 1615 if (src == NULL || *src == '\0') { 1616 strcpy(dest, "PaxHeader/blank"); 1617 return (dest); 1618 } 1619 1620 /* Prune final '/' and other unwanted final elements. */ 1621 p = src + strlen(src); 1622 for (;;) { 1623 /* Ends in "/", remove the '/' */ 1624 if (p > src && p[-1] == '/') { 1625 --p; 1626 continue; 1627 } 1628 /* Ends in "/.", remove the '.' */ 1629 if (p > src + 1 && p[-1] == '.' 1630 && p[-2] == '/') { 1631 --p; 1632 continue; 1633 } 1634 break; 1635 } 1636 1637 /* Pathological case: After above, there was nothing left. 1638 * This includes "/." "/./." "/.//./." etc. */ 1639 if (p == src) { 1640 strcpy(dest, "/PaxHeader/rootdir"); 1641 return (dest); 1642 } 1643 1644 /* Convert unadorned "." into a suitable filename. */ 1645 if (*src == '.' && p == src + 1) { 1646 strcpy(dest, "PaxHeader/currentdir"); 1647 return (dest); 1648 } 1649 1650 /* 1651 * TODO: Push this string into the 'pax' structure to avoid 1652 * recomputing it every time. That will also open the door 1653 * to having clients override it. 1654 */ 1655#if HAVE_GETPID && 0 /* Disable this for now; see above comment. */ 1656 sprintf(buff, "PaxHeader.%d", getpid()); 1657#else 1658 /* If the platform can't fetch the pid, don't include it. */ 1659 strcpy(buff, "PaxHeader"); 1660#endif 1661 /* General case: build a ustar-compatible name adding 1662 * "/PaxHeader/". */ 1663 build_ustar_entry_name(dest, src, p - src, buff); 1664 1665 return (dest); 1666} 1667 1668/* 1669 * GNU PAX Format 1.0 requires the special name, which pattern is: 1670 * <dir>/GNUSparseFile.<pid>/<original file name> 1671 * 1672 * Since reproducible archives are more important, use 0 as pid. 1673 * 1674 * This function is used for only Sparse file, a file type of which 1675 * is regular file. 1676 */ 1677static char * 1678build_gnu_sparse_name(char *dest, const char *src) 1679{ 1680 const char *p; 1681 1682 /* Handle the null filename case. */ 1683 if (src == NULL || *src == '\0') { 1684 strcpy(dest, "GNUSparseFile/blank"); 1685 return (dest); 1686 } 1687 1688 /* Prune final '/' and other unwanted final elements. */ 1689 p = src + strlen(src); 1690 for (;;) { 1691 /* Ends in "/", remove the '/' */ 1692 if (p > src && p[-1] == '/') { 1693 --p; 1694 continue; 1695 } 1696 /* Ends in "/.", remove the '.' */ 1697 if (p > src + 1 && p[-1] == '.' 1698 && p[-2] == '/') { 1699 --p; 1700 continue; 1701 } 1702 break; 1703 } 1704 1705 /* General case: build a ustar-compatible name adding 1706 * "/GNUSparseFile/". */ 1707 build_ustar_entry_name(dest, src, p - src, "GNUSparseFile.0"); 1708 1709 return (dest); 1710} 1711 1712/* Write two null blocks for the end of archive */ 1713static int 1714archive_write_pax_close(struct archive_write *a) 1715{ 1716 return (__archive_write_nulls(a, 512 * 2)); 1717} 1718 1719static int 1720archive_write_pax_free(struct archive_write *a) 1721{ 1722 struct pax *pax; 1723 1724 pax = (struct pax *)a->format_data; 1725 if (pax == NULL) 1726 return (ARCHIVE_OK); 1727 1728 archive_string_free(&pax->pax_header); 1729 archive_string_free(&pax->sparse_map); 1730 archive_string_free(&pax->l_url_encoded_name); 1731 sparse_list_clear(pax); 1732 free(pax); 1733 a->format_data = NULL; 1734 return (ARCHIVE_OK); 1735} 1736 1737static int 1738archive_write_pax_finish_entry(struct archive_write *a) 1739{ 1740 struct pax *pax; 1741 uint64_t remaining; 1742 int ret; 1743 1744 pax = (struct pax *)a->format_data; 1745 remaining = pax->entry_bytes_remaining; 1746 if (remaining == 0) { 1747 while (pax->sparse_list) { 1748 struct sparse_block *sb; 1749 if (!pax->sparse_list->is_hole) 1750 remaining += pax->sparse_list->remaining; 1751 sb = pax->sparse_list->next; 1752 free(pax->sparse_list); 1753 pax->sparse_list = sb; 1754 } 1755 } 1756 ret = __archive_write_nulls(a, (size_t)(remaining + pax->entry_padding)); 1757 pax->entry_bytes_remaining = pax->entry_padding = 0; 1758 return (ret); 1759} 1760 1761static ssize_t 1762archive_write_pax_data(struct archive_write *a, const void *buff, size_t s) 1763{ 1764 struct pax *pax; 1765 size_t ws; 1766 size_t total; 1767 int ret; 1768 1769 pax = (struct pax *)a->format_data; 1770 1771 /* 1772 * According to GNU PAX format 1.0, write a sparse map 1773 * before the body. 1774 */ 1775 if (archive_strlen(&(pax->sparse_map))) { 1776 ret = __archive_write_output(a, pax->sparse_map.s, 1777 archive_strlen(&(pax->sparse_map))); 1778 if (ret != ARCHIVE_OK) 1779 return (ret); 1780 ret = __archive_write_nulls(a, pax->sparse_map_padding); 1781 if (ret != ARCHIVE_OK) 1782 return (ret); 1783 archive_string_empty(&(pax->sparse_map)); 1784 } 1785 1786 total = 0; 1787 while (total < s) { 1788 const unsigned char *p; 1789 1790 while (pax->sparse_list != NULL && 1791 pax->sparse_list->remaining == 0) { 1792 struct sparse_block *sb = pax->sparse_list->next; 1793 free(pax->sparse_list); 1794 pax->sparse_list = sb; 1795 } 1796 1797 if (pax->sparse_list == NULL) 1798 return (total); 1799 1800 p = ((const unsigned char *)buff) + total; 1801 ws = s - total; 1802 if (ws > pax->sparse_list->remaining) 1803 ws = (size_t)pax->sparse_list->remaining; 1804 1805 if (pax->sparse_list->is_hole) { 1806 /* Current block is hole thus we do not write 1807 * the body. */ 1808 pax->sparse_list->remaining -= ws; 1809 total += ws; 1810 continue; 1811 } 1812 1813 ret = __archive_write_output(a, p, ws); 1814 pax->sparse_list->remaining -= ws; 1815 total += ws; 1816 if (ret != ARCHIVE_OK) 1817 return (ret); 1818 } 1819 return (total); 1820} 1821 1822static int 1823has_non_ASCII(const char *_p) 1824{ 1825 const unsigned char *p = (const unsigned char *)_p; 1826 1827 if (p == NULL) 1828 return (1); 1829 while (*p != '\0' && *p < 128) 1830 p++; 1831 return (*p != '\0'); 1832} 1833 1834/* 1835 * Used by extended attribute support; encodes the name 1836 * so that there will be no '=' characters in the result. 1837 */ 1838static char * 1839url_encode(const char *in) 1840{ 1841 const char *s; 1842 char *d; 1843 int out_len = 0; 1844 char *out; 1845 1846 for (s = in; *s != '\0'; s++) { 1847 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') 1848 out_len += 3; 1849 else 1850 out_len++; 1851 } 1852 1853 out = (char *)malloc(out_len + 1); 1854 if (out == NULL) 1855 return (NULL); 1856 1857 for (s = in, d = out; *s != '\0'; s++) { 1858 /* encode any non-printable ASCII character or '%' or '=' */ 1859 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') { 1860 /* URL encoding is '%' followed by two hex digits */ 1861 *d++ = '%'; 1862 *d++ = "0123456789ABCDEF"[0x0f & (*s >> 4)]; 1863 *d++ = "0123456789ABCDEF"[0x0f & *s]; 1864 } else { 1865 *d++ = *s; 1866 } 1867 } 1868 *d = '\0'; 1869 return (out); 1870} 1871 1872/* 1873 * Encode a sequence of bytes into a C string using base-64 encoding. 1874 * 1875 * Returns a null-terminated C string allocated with malloc(); caller 1876 * is responsible for freeing the result. 1877 */ 1878static char * 1879base64_encode(const char *s, size_t len) 1880{ 1881 static const char digits[64] = 1882 { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O', 1883 'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d', 1884 'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s', 1885 't','u','v','w','x','y','z','0','1','2','3','4','5','6','7', 1886 '8','9','+','/' }; 1887 int v; 1888 char *d, *out; 1889 1890 /* 3 bytes becomes 4 chars, but round up and allow for trailing NUL */ 1891 out = (char *)malloc((len * 4 + 2) / 3 + 1); 1892 if (out == NULL) 1893 return (NULL); 1894 d = out; 1895 1896 /* Convert each group of 3 bytes into 4 characters. */ 1897 while (len >= 3) { 1898 v = (((int)s[0] << 16) & 0xff0000) 1899 | (((int)s[1] << 8) & 0xff00) 1900 | (((int)s[2]) & 0x00ff); 1901 s += 3; 1902 len -= 3; 1903 *d++ = digits[(v >> 18) & 0x3f]; 1904 *d++ = digits[(v >> 12) & 0x3f]; 1905 *d++ = digits[(v >> 6) & 0x3f]; 1906 *d++ = digits[(v) & 0x3f]; 1907 } 1908 /* Handle final group of 1 byte (2 chars) or 2 bytes (3 chars). */ 1909 switch (len) { 1910 case 0: break; 1911 case 1: 1912 v = (((int)s[0] << 16) & 0xff0000); 1913 *d++ = digits[(v >> 18) & 0x3f]; 1914 *d++ = digits[(v >> 12) & 0x3f]; 1915 break; 1916 case 2: 1917 v = (((int)s[0] << 16) & 0xff0000) 1918 | (((int)s[1] << 8) & 0xff00); 1919 *d++ = digits[(v >> 18) & 0x3f]; 1920 *d++ = digits[(v >> 12) & 0x3f]; 1921 *d++ = digits[(v >> 6) & 0x3f]; 1922 break; 1923 } 1924 /* Add trailing NUL character so output is a valid C string. */ 1925 *d = '\0'; 1926 return (out); 1927} 1928 1929static void 1930sparse_list_clear(struct pax *pax) 1931{ 1932 while (pax->sparse_list != NULL) { 1933 struct sparse_block *sb = pax->sparse_list; 1934 pax->sparse_list = sb->next; 1935 free(sb); 1936 } 1937 pax->sparse_tail = NULL; 1938} 1939 1940static int 1941_sparse_list_add_block(struct pax *pax, int64_t offset, int64_t length, 1942 int is_hole) 1943{ 1944 struct sparse_block *sb; 1945 1946 sb = (struct sparse_block *)malloc(sizeof(*sb)); 1947 if (sb == NULL) 1948 return (ARCHIVE_FATAL); 1949 sb->next = NULL; 1950 sb->is_hole = is_hole; 1951 sb->offset = offset; 1952 sb->remaining = length; 1953 if (pax->sparse_list == NULL || pax->sparse_tail == NULL) 1954 pax->sparse_list = pax->sparse_tail = sb; 1955 else { 1956 pax->sparse_tail->next = sb; 1957 pax->sparse_tail = sb; 1958 } 1959 return (ARCHIVE_OK); 1960} 1961 1962static int 1963sparse_list_add(struct pax *pax, int64_t offset, int64_t length) 1964{ 1965 int64_t last_offset; 1966 int r; 1967 1968 if (pax->sparse_tail == NULL) 1969 last_offset = 0; 1970 else { 1971 last_offset = pax->sparse_tail->offset + 1972 pax->sparse_tail->remaining; 1973 } 1974 if (last_offset < offset) { 1975 /* Add a hole block. */ 1976 r = _sparse_list_add_block(pax, last_offset, 1977 offset - last_offset, 1); 1978 if (r != ARCHIVE_OK) 1979 return (r); 1980 } 1981 /* Add data block. */ 1982 return (_sparse_list_add_block(pax, offset, length, 0)); 1983} 1984 1985