1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "archive_platform.h" 27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_format_pax.c,v 1.49 2008/09/30 03:57:07 kientzle Exp $"); 28 29 #ifdef HAVE_ERRNO_H 30 #include <errno.h> 31 #endif 32 #ifdef HAVE_STDLIB_H 33 #include <stdlib.h> 34 #endif 35 #ifdef HAVE_STRING_H 36 #include <string.h> 37 #endif 38 39 #include "archive.h" 40 #include "archive_entry.h" 41 #include "archive_private.h" 42 #include "archive_write_private.h" 43 44 struct pax { 45 uint64_t entry_bytes_remaining; 46 uint64_t entry_padding; 47 struct archive_string pax_header; 48 }; 49 50 static void add_pax_attr(struct archive_string *, const char *key, 51 const char *value); 52 static void add_pax_attr_int(struct archive_string *, 53 const char *key, int64_t value); 54 static void add_pax_attr_time(struct archive_string *, 55 const char *key, int64_t sec, 56 unsigned long nanos); 57 static void add_pax_attr_w(struct archive_string *, 58 const char *key, const wchar_t *wvalue); 59 static ssize_t archive_write_pax_data(struct archive_write *, 60 const void *, size_t); 61 static int archive_write_pax_finish(struct archive_write *); 62 static int archive_write_pax_destroy(struct archive_write *); 63 static int archive_write_pax_finish_entry(struct archive_write *); 64 static int archive_write_pax_header(struct archive_write *, 65 struct archive_entry *); 66 static char *base64_encode(const char *src, size_t len); 67 static char *build_pax_attribute_name(char *dest, const char *src); 68 static char *build_ustar_entry_name(char *dest, const char *src, 69 size_t src_length, const char *insert); 70 static char *format_int(char *dest, int64_t); 71 static int has_non_ASCII(const wchar_t *); 72 static char *url_encode(const char *in); 73 static int write_nulls(struct archive_write *, size_t); 74 75 /* 76 * Set output format to 'restricted pax' format. 77 * 78 * This is the same as normal 'pax', but tries to suppress 79 * the pax header whenever possible. This is the default for 80 * bsdtar, for instance. 81 */ 82 int 83 archive_write_set_format_pax_restricted(struct archive *_a) 84 { 85 struct archive_write *a = (struct archive_write *)_a; 86 int r; 87 r = archive_write_set_format_pax(&a->archive); 88 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; 89 a->archive.archive_format_name = "restricted POSIX pax interchange"; 90 return (r); 91 } 92 93 /* 94 * Set output format to 'pax' format. 95 */ 96 int 97 archive_write_set_format_pax(struct archive *_a) 98 { 99 struct archive_write *a = (struct archive_write *)_a; 100 struct pax *pax; 101 102 if (a->format_destroy != NULL) 103 (a->format_destroy)(a); 104 105 pax = (struct pax *)malloc(sizeof(*pax)); 106 if (pax == NULL) { 107 archive_set_error(&a->archive, ENOMEM, "Can't allocate pax data"); 108 return (ARCHIVE_FATAL); 109 } 110 memset(pax, 0, sizeof(*pax)); 111 a->format_data = pax; 112 113 a->pad_uncompressed = 1; 114 a->format_name = "pax"; 115 a->format_write_header = archive_write_pax_header; 116 a->format_write_data = archive_write_pax_data; 117 a->format_finish = archive_write_pax_finish; 118 a->format_destroy = archive_write_pax_destroy; 119 a->format_finish_entry = archive_write_pax_finish_entry; 120 a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; 121 a->archive.archive_format_name = "POSIX pax interchange"; 122 return (ARCHIVE_OK); 123 } 124 125 /* 126 * Note: This code assumes that 'nanos' has the same sign as 'sec', 127 * which implies that sec=-1, nanos=200000000 represents -1.2 seconds 128 * and not -0.8 seconds. This is a pretty pedantic point, as we're 129 * unlikely to encounter many real files created before Jan 1, 1970, 130 * much less ones with timestamps recorded to sub-second resolution. 131 */ 132 static void 133 add_pax_attr_time(struct archive_string *as, const char *key, 134 int64_t sec, unsigned long nanos) 135 { 136 int digit, i; 137 char *t; 138 /* 139 * Note that each byte contributes fewer than 3 base-10 140 * digits, so this will always be big enough. 141 */ 142 char tmp[1 + 3*sizeof(sec) + 1 + 3*sizeof(nanos)]; 143 144 tmp[sizeof(tmp) - 1] = 0; 145 t = tmp + sizeof(tmp) - 1; 146 147 /* Skip trailing zeros in the fractional part. */ 148 for (digit = 0, i = 10; i > 0 && digit == 0; i--) { 149 digit = nanos % 10; 150 nanos /= 10; 151 } 152 153 /* Only format the fraction if it's non-zero. */ 154 if (i > 0) { 155 while (i > 0) { 156 *--t = "0123456789"[digit]; 157 digit = nanos % 10; 158 nanos /= 10; 159 i--; 160 } 161 *--t = '.'; 162 } 163 t = format_int(t, sec); 164 165 add_pax_attr(as, key, t); 166 } 167 168 static char * 169 format_int(char *t, int64_t i) 170 { 171 int sign; 172 173 if (i < 0) { 174 sign = -1; 175 i = -i; 176 } else 177 sign = 1; 178 179 do { 180 *--t = "0123456789"[i % 10]; 181 } while (i /= 10); 182 if (sign < 0) 183 *--t = '-'; 184 return (t); 185 } 186 187 static void 188 add_pax_attr_int(struct archive_string *as, const char *key, int64_t value) 189 { 190 char tmp[1 + 3 * sizeof(value)]; 191 192 tmp[sizeof(tmp) - 1] = 0; 193 add_pax_attr(as, key, format_int(tmp + sizeof(tmp) - 1, value)); 194 } 195 196 static char * 197 utf8_encode(const wchar_t *wval) 198 { 199 int utf8len; 200 const wchar_t *wp; 201 unsigned long wc; 202 char *utf8_value, *p; 203 204 utf8len = 0; 205 for (wp = wval; *wp != L'\0'; ) { 206 wc = *wp++; 207 208 if (wc >= 0xd800 && wc <= 0xdbff 209 && *wp >= 0xdc00 && *wp <= 0xdfff) { 210 /* This is a surrogate pair. Combine into a 211 * full Unicode value before encoding into 212 * UTF-8. */ 213 wc = (wc - 0xd800) << 10; /* High 10 bits */ 214 wc += (*wp++ - 0xdc00); /* Low 10 bits */ 215 wc += 0x10000; /* Skip BMP */ 216 } 217 if (wc <= 0x7f) 218 utf8len++; 219 else if (wc <= 0x7ff) 220 utf8len += 2; 221 else if (wc <= 0xffff) 222 utf8len += 3; 223 else if (wc <= 0x1fffff) 224 utf8len += 4; 225 else if (wc <= 0x3ffffff) 226 utf8len += 5; 227 else if (wc <= 0x7fffffff) 228 utf8len += 6; 229 /* Ignore larger values; UTF-8 can't encode them. */ 230 } 231 232 utf8_value = (char *)malloc(utf8len + 1); 233 if (utf8_value == NULL) { 234 __archive_errx(1, "Not enough memory for attributes"); 235 return (NULL); 236 } 237 238 for (wp = wval, p = utf8_value; *wp != L'\0'; ) { 239 wc = *wp++; 240 if (wc >= 0xd800 && wc <= 0xdbff 241 && *wp >= 0xdc00 && *wp <= 0xdfff) { 242 /* Combine surrogate pair. */ 243 wc = (wc - 0xd800) << 10; 244 wc += *wp++ - 0xdc00 + 0x10000; 245 } 246 if (wc <= 0x7f) { 247 *p++ = (char)wc; 248 } else if (wc <= 0x7ff) { 249 p[0] = 0xc0 | ((wc >> 6) & 0x1f); 250 p[1] = 0x80 | (wc & 0x3f); 251 p += 2; 252 } else if (wc <= 0xffff) { 253 p[0] = 0xe0 | ((wc >> 12) & 0x0f); 254 p[1] = 0x80 | ((wc >> 6) & 0x3f); 255 p[2] = 0x80 | (wc & 0x3f); 256 p += 3; 257 } else if (wc <= 0x1fffff) { 258 p[0] = 0xf0 | ((wc >> 18) & 0x07); 259 p[1] = 0x80 | ((wc >> 12) & 0x3f); 260 p[2] = 0x80 | ((wc >> 6) & 0x3f); 261 p[3] = 0x80 | (wc & 0x3f); 262 p += 4; 263 } else if (wc <= 0x3ffffff) { 264 p[0] = 0xf8 | ((wc >> 24) & 0x03); 265 p[1] = 0x80 | ((wc >> 18) & 0x3f); 266 p[2] = 0x80 | ((wc >> 12) & 0x3f); 267 p[3] = 0x80 | ((wc >> 6) & 0x3f); 268 p[4] = 0x80 | (wc & 0x3f); 269 p += 5; 270 } else if (wc <= 0x7fffffff) { 271 p[0] = 0xfc | ((wc >> 30) & 0x01); 272 p[1] = 0x80 | ((wc >> 24) & 0x3f); 273 p[1] = 0x80 | ((wc >> 18) & 0x3f); 274 p[2] = 0x80 | ((wc >> 12) & 0x3f); 275 p[3] = 0x80 | ((wc >> 6) & 0x3f); 276 p[4] = 0x80 | (wc & 0x3f); 277 p += 6; 278 } 279 /* Ignore larger values; UTF-8 can't encode them. */ 280 } 281 *p = '\0'; 282 283 return (utf8_value); 284 } 285 286 static void 287 add_pax_attr_w(struct archive_string *as, const char *key, const wchar_t *wval) 288 { 289 char *utf8_value = utf8_encode(wval); 290 if (utf8_value == NULL) 291 return; 292 add_pax_attr(as, key, utf8_value); 293 free(utf8_value); 294 } 295 296 /* 297 * Add a key/value attribute to the pax header. This function handles 298 * the length field and various other syntactic requirements. 299 */ 300 static void 301 add_pax_attr(struct archive_string *as, const char *key, const char *value) 302 { 303 int digits, i, len, next_ten; 304 char tmp[1 + 3 * sizeof(int)]; /* < 3 base-10 digits per byte */ 305 306 /*- 307 * PAX attributes have the following layout: 308 * <len> <space> <key> <=> <value> <nl> 309 */ 310 len = 1 + strlen(key) + 1 + strlen(value) + 1; 311 312 /* 313 * The <len> field includes the length of the <len> field, so 314 * computing the correct length is tricky. I start by 315 * counting the number of base-10 digits in 'len' and 316 * computing the next higher power of 10. 317 */ 318 next_ten = 1; 319 digits = 0; 320 i = len; 321 while (i > 0) { 322 i = i / 10; 323 digits++; 324 next_ten = next_ten * 10; 325 } 326 /* 327 * For example, if string without the length field is 99 328 * chars, then adding the 2 digit length "99" will force the 329 * total length past 100, requiring an extra digit. The next 330 * statement adjusts for this effect. 331 */ 332 if (len + digits >= next_ten) 333 digits++; 334 335 /* Now, we have the right length so we can build the line. */ 336 tmp[sizeof(tmp) - 1] = 0; /* Null-terminate the work area. */ 337 archive_strcat(as, format_int(tmp + sizeof(tmp) - 1, len + digits)); 338 archive_strappend_char(as, ' '); 339 archive_strcat(as, key); 340 archive_strappend_char(as, '='); 341 archive_strcat(as, value); 342 archive_strappend_char(as, '\n'); 343 } 344 345 static void 346 archive_write_pax_header_xattrs(struct pax *pax, struct archive_entry *entry) 347 { 348 struct archive_string s; 349 int i = archive_entry_xattr_reset(entry); 350 351 while (i--) { 352 const char *name; 353 const void *value; 354 char *encoded_value; 355 char *url_encoded_name = NULL, *encoded_name = NULL; 356 wchar_t *wcs_name = NULL; 357 size_t size; 358 359 archive_entry_xattr_next(entry, &name, &value, &size); 360 /* Name is URL-encoded, then converted to wchar_t, 361 * then UTF-8 encoded. */ 362 url_encoded_name = url_encode(name); 363 if (url_encoded_name != NULL) { 364 /* Convert narrow-character to wide-character. */ 365 int wcs_length = strlen(url_encoded_name); 366 wcs_name = (wchar_t *)malloc((wcs_length + 1) * sizeof(wchar_t)); 367 if (wcs_name == NULL) 368 __archive_errx(1, "No memory for xattr conversion"); 369 mbstowcs(wcs_name, url_encoded_name, wcs_length); 370 wcs_name[wcs_length] = 0; 371 free(url_encoded_name); /* Done with this. */ 372 } 373 if (wcs_name != NULL) { 374 encoded_name = utf8_encode(wcs_name); 375 free(wcs_name); /* Done with wchar_t name. */ 376 } 377 378 encoded_value = base64_encode((const char *)value, size); 379 380 if (encoded_name != NULL && encoded_value != NULL) { 381 archive_string_init(&s); 382 archive_strcpy(&s, "LIBARCHIVE.xattr."); 383 archive_strcat(&s, encoded_name); 384 add_pax_attr(&(pax->pax_header), s.s, encoded_value); 385 archive_string_free(&s); 386 } 387 free(encoded_name); 388 free(encoded_value); 389 } 390 } 391 392 /* 393 * TODO: Consider adding 'comment' and 'charset' fields to 394 * archive_entry so that clients can specify them. Also, consider 395 * adding generic key/value tags so clients can add arbitrary 396 * key/value data. 397 */ 398 static int 399 archive_write_pax_header(struct archive_write *a, 400 struct archive_entry *entry_original) 401 { 402 struct archive_entry *entry_main; 403 const char *p; 404 char *t; 405 const wchar_t *wp; 406 const char *suffix; 407 int need_extension, r, ret; 408 struct pax *pax; 409 const char *hdrcharset = NULL; 410 const char *hardlink; 411 const char *path = NULL, *linkpath = NULL; 412 const char *uname = NULL, *gname = NULL; 413 const wchar_t *path_w = NULL, *linkpath_w = NULL; 414 const wchar_t *uname_w = NULL, *gname_w = NULL; 415 416 char paxbuff[512]; 417 char ustarbuff[512]; 418 char ustar_entry_name[256]; 419 char pax_entry_name[256]; 420 421 ret = ARCHIVE_OK; 422 need_extension = 0; 423 pax = (struct pax *)a->format_data; 424 425 hardlink = archive_entry_hardlink(entry_original); 426 427 /* Make sure this is a type of entry that we can handle here */ 428 if (hardlink == NULL) { 429 switch (archive_entry_filetype(entry_original)) { 430 case AE_IFBLK: 431 case AE_IFCHR: 432 case AE_IFIFO: 433 case AE_IFLNK: 434 case AE_IFREG: 435 break; 436 case AE_IFDIR: 437 /* 438 * Ensure a trailing '/'. Modify the original 439 * entry so the client sees the change. 440 */ 441 p = archive_entry_pathname(entry_original); 442 if (p[strlen(p) - 1] != '/') { 443 t = (char *)malloc(strlen(p) + 2); 444 if (t == NULL) { 445 archive_set_error(&a->archive, ENOMEM, 446 "Can't allocate pax data"); 447 return(ARCHIVE_FATAL); 448 } 449 strcpy(t, p); 450 strcat(t, "/"); 451 archive_entry_copy_pathname(entry_original, t); 452 free(t); 453 } 454 break; 455 default: 456 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 457 "tar format cannot archive this (type=0%lo)", 458 (unsigned long)archive_entry_filetype(entry_original)); 459 return (ARCHIVE_WARN); 460 } 461 } 462 463 /* Copy entry so we can modify it as needed. */ 464 entry_main = archive_entry_clone(entry_original); 465 archive_string_empty(&(pax->pax_header)); /* Blank our work area. */ 466 467 /* 468 * First, check the name fields and see if any of them 469 * require binary coding. If any of them does, then all of 470 * them do. 471 */ 472 hdrcharset = NULL; 473 path = archive_entry_pathname(entry_main); 474 path_w = archive_entry_pathname_w(entry_main); 475 if (path != NULL && path_w == NULL) { 476 archive_set_error(&a->archive, EILSEQ, 477 "Can't translate pathname '%s' to UTF-8", path); 478 ret = ARCHIVE_WARN; 479 hdrcharset = "BINARY"; 480 } 481 uname = archive_entry_uname(entry_main); 482 uname_w = archive_entry_uname_w(entry_main); 483 if (uname != NULL && uname_w == NULL) { 484 archive_set_error(&a->archive, EILSEQ, 485 "Can't translate uname '%s' to UTF-8", uname); 486 ret = ARCHIVE_WARN; 487 hdrcharset = "BINARY"; 488 } 489 gname = archive_entry_gname(entry_main); 490 gname_w = archive_entry_gname_w(entry_main); 491 if (gname != NULL && gname_w == NULL) { 492 archive_set_error(&a->archive, EILSEQ, 493 "Can't translate gname '%s' to UTF-8", gname); 494 ret = ARCHIVE_WARN; 495 hdrcharset = "BINARY"; 496 } 497 linkpath = hardlink; 498 if (linkpath != NULL) { 499 linkpath_w = archive_entry_hardlink_w(entry_main); 500 } else { 501 linkpath = archive_entry_symlink(entry_main); 502 if (linkpath != NULL) 503 linkpath_w = archive_entry_symlink_w(entry_main); 504 } 505 if (linkpath != NULL && linkpath_w == NULL) { 506 archive_set_error(&a->archive, EILSEQ, 507 "Can't translate linkpath '%s' to UTF-8", linkpath); 508 ret = ARCHIVE_WARN; 509 hdrcharset = "BINARY"; 510 } 511 512 /* Store the header encoding first, to be nice to readers. */ 513 if (hdrcharset != NULL) 514 add_pax_attr(&(pax->pax_header), "hdrcharset", hdrcharset); 515 516 517 /* 518 * If name is too long, or has non-ASCII characters, add 519 * 'path' to pax extended attrs. (Note that an unconvertible 520 * name must have non-ASCII characters.) 521 */ 522 if (path == NULL) { 523 /* We don't have a narrow version, so we have to store 524 * the wide version. */ 525 add_pax_attr_w(&(pax->pax_header), "path", path_w); 526 archive_entry_set_pathname(entry_main, "@WidePath"); 527 need_extension = 1; 528 } else if (has_non_ASCII(path_w)) { 529 /* We have non-ASCII characters. */ 530 if (path_w == NULL || hdrcharset != NULL) { 531 /* Can't do UTF-8, so store it raw. */ 532 add_pax_attr(&(pax->pax_header), "path", path); 533 } else { 534 /* Store UTF-8 */ 535 add_pax_attr_w(&(pax->pax_header), 536 "path", path_w); 537 } 538 archive_entry_set_pathname(entry_main, 539 build_ustar_entry_name(ustar_entry_name, 540 path, strlen(path), NULL)); 541 need_extension = 1; 542 } else { 543 /* We have an all-ASCII path; we'd like to just store 544 * it in the ustar header if it will fit. Yes, this 545 * duplicates some of the logic in 546 * write_set_format_ustar.c 547 */ 548 if (strlen(path) <= 100) { 549 /* Fits in the old 100-char tar name field. */ 550 } else { 551 /* Find largest suffix that will fit. */ 552 /* Note: strlen() > 100, so strlen() - 100 - 1 >= 0 */ 553 suffix = strchr(path + strlen(path) - 100 - 1, '/'); 554 /* Don't attempt an empty prefix. */ 555 if (suffix == path) 556 suffix = strchr(suffix + 1, '/'); 557 /* We can put it in the ustar header if it's 558 * all ASCII and it's either <= 100 characters 559 * or can be split at a '/' into a prefix <= 560 * 155 chars and a suffix <= 100 chars. (Note 561 * the strchr() above will return NULL exactly 562 * when the path can't be split.) 563 */ 564 if (suffix == NULL /* Suffix > 100 chars. */ 565 || suffix[1] == '\0' /* empty suffix */ 566 || suffix - path > 155) /* Prefix > 155 chars */ 567 { 568 if (path_w == NULL || hdrcharset != NULL) { 569 /* Can't do UTF-8, so store it raw. */ 570 add_pax_attr(&(pax->pax_header), 571 "path", path); 572 } else { 573 /* Store UTF-8 */ 574 add_pax_attr_w(&(pax->pax_header), 575 "path", path_w); 576 } 577 archive_entry_set_pathname(entry_main, 578 build_ustar_entry_name(ustar_entry_name, 579 path, strlen(path), NULL)); 580 need_extension = 1; 581 } 582 } 583 } 584 585 if (linkpath != NULL) { 586 /* If link name is too long or has non-ASCII characters, add 587 * 'linkpath' to pax extended attrs. */ 588 if (strlen(linkpath) > 100 || linkpath_w == NULL 589 || linkpath_w == NULL || has_non_ASCII(linkpath_w)) { 590 if (linkpath_w == NULL || hdrcharset != NULL) 591 /* If the linkpath is not convertible 592 * to wide, or we're encoding in 593 * binary anyway, store it raw. */ 594 add_pax_attr(&(pax->pax_header), 595 "linkpath", linkpath); 596 else 597 /* If the link is long or has a 598 * non-ASCII character, store it as a 599 * pax extended attribute. */ 600 add_pax_attr_w(&(pax->pax_header), 601 "linkpath", linkpath_w); 602 if (strlen(linkpath) > 100) { 603 if (hardlink != NULL) 604 archive_entry_set_hardlink(entry_main, 605 "././@LongHardLink"); 606 else 607 archive_entry_set_symlink(entry_main, 608 "././@LongSymLink"); 609 } 610 need_extension = 1; 611 } 612 } 613 614 /* If file size is too large, add 'size' to pax extended attrs. */ 615 if (archive_entry_size(entry_main) >= (((int64_t)1) << 33)) { 616 add_pax_attr_int(&(pax->pax_header), "size", 617 archive_entry_size(entry_main)); 618 need_extension = 1; 619 } 620 621 /* If numeric GID is too large, add 'gid' to pax extended attrs. */ 622 if (archive_entry_gid(entry_main) >= (1 << 18)) { 623 add_pax_attr_int(&(pax->pax_header), "gid", 624 archive_entry_gid(entry_main)); 625 need_extension = 1; 626 } 627 628 /* If group name is too large or has non-ASCII characters, add 629 * 'gname' to pax extended attrs. */ 630 if (gname != NULL) { 631 if (strlen(gname) > 31 632 || gname_w == NULL 633 || has_non_ASCII(gname_w)) 634 { 635 if (gname_w == NULL || hdrcharset != NULL) { 636 add_pax_attr(&(pax->pax_header), 637 "gname", gname); 638 } else { 639 add_pax_attr_w(&(pax->pax_header), 640 "gname", gname_w); 641 } 642 need_extension = 1; 643 } 644 } 645 646 /* If numeric UID is too large, add 'uid' to pax extended attrs. */ 647 if (archive_entry_uid(entry_main) >= (1 << 18)) { 648 add_pax_attr_int(&(pax->pax_header), "uid", 649 archive_entry_uid(entry_main)); 650 need_extension = 1; 651 } 652 653 /* Add 'uname' to pax extended attrs if necessary. */ 654 if (uname != NULL) { 655 if (strlen(uname) > 31 656 || uname_w == NULL 657 || has_non_ASCII(uname_w)) 658 { 659 if (uname_w == NULL || hdrcharset != NULL) { 660 add_pax_attr(&(pax->pax_header), 661 "uname", uname); 662 } else { 663 add_pax_attr_w(&(pax->pax_header), 664 "uname", uname_w); 665 } 666 need_extension = 1; 667 } 668 } 669 670 /* 671 * POSIX/SUSv3 doesn't provide a standard key for large device 672 * numbers. I use the same keys here that Joerg Schilling 673 * used for 'star.' (Which, somewhat confusingly, are called 674 * "devXXX" even though they code "rdev" values.) No doubt, 675 * other implementations use other keys. Note that there's no 676 * reason we can't write the same information into a number of 677 * different keys. 678 * 679 * Of course, this is only needed for block or char device entries. 680 */ 681 if (archive_entry_filetype(entry_main) == AE_IFBLK 682 || archive_entry_filetype(entry_main) == AE_IFCHR) { 683 /* 684 * If rdevmajor is too large, add 'SCHILY.devmajor' to 685 * extended attributes. 686 */ 687 dev_t rdevmajor, rdevminor; 688 rdevmajor = archive_entry_rdevmajor(entry_main); 689 rdevminor = archive_entry_rdevminor(entry_main); 690 if (rdevmajor >= (1 << 18)) { 691 add_pax_attr_int(&(pax->pax_header), "SCHILY.devmajor", 692 rdevmajor); 693 /* 694 * Non-strict formatting below means we don't 695 * have to truncate here. Not truncating improves 696 * the chance that some more modern tar archivers 697 * (such as GNU tar 1.13) can restore the full 698 * value even if they don't understand the pax 699 * extended attributes. See my rant below about 700 * file size fields for additional details. 701 */ 702 /* archive_entry_set_rdevmajor(entry_main, 703 rdevmajor & ((1 << 18) - 1)); */ 704 need_extension = 1; 705 } 706 707 /* 708 * If devminor is too large, add 'SCHILY.devminor' to 709 * extended attributes. 710 */ 711 if (rdevminor >= (1 << 18)) { 712 add_pax_attr_int(&(pax->pax_header), "SCHILY.devminor", 713 rdevminor); 714 /* Truncation is not necessary here, either. */ 715 /* archive_entry_set_rdevminor(entry_main, 716 rdevminor & ((1 << 18) - 1)); */ 717 need_extension = 1; 718 } 719 } 720 721 /* 722 * Technically, the mtime field in the ustar header can 723 * support 33 bits, but many platforms use signed 32-bit time 724 * values. The cutoff of 0x7fffffff here is a compromise. 725 * Yes, this check is duplicated just below; this helps to 726 * avoid writing an mtime attribute just to handle a 727 * high-resolution timestamp in "restricted pax" mode. 728 */ 729 if (!need_extension && 730 ((archive_entry_mtime(entry_main) < 0) 731 || (archive_entry_mtime(entry_main) >= 0x7fffffff))) 732 need_extension = 1; 733 734 /* I use a star-compatible file flag attribute. */ 735 p = archive_entry_fflags_text(entry_main); 736 if (!need_extension && p != NULL && *p != '\0') 737 need_extension = 1; 738 739 /* If there are non-trivial ACL entries, we need an extension. */ 740 if (!need_extension && archive_entry_acl_count(entry_original, 741 ARCHIVE_ENTRY_ACL_TYPE_ACCESS) > 0) 742 need_extension = 1; 743 744 /* If there are non-trivial ACL entries, we need an extension. */ 745 if (!need_extension && archive_entry_acl_count(entry_original, 746 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) > 0) 747 need_extension = 1; 748 749 /* If there are extended attributes, we need an extension */ 750 if (!need_extension && archive_entry_xattr_count(entry_original) > 0) 751 need_extension = 1; 752 753 /* 754 * The following items are handled differently in "pax 755 * restricted" format. In particular, in "pax restricted" 756 * format they won't be added unless need_extension is 757 * already set (we're already generating an extended header, so 758 * may as well include these). 759 */ 760 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_RESTRICTED || 761 need_extension) { 762 763 if (archive_entry_mtime(entry_main) < 0 || 764 archive_entry_mtime(entry_main) >= 0x7fffffff || 765 archive_entry_mtime_nsec(entry_main) != 0) 766 add_pax_attr_time(&(pax->pax_header), "mtime", 767 archive_entry_mtime(entry_main), 768 archive_entry_mtime_nsec(entry_main)); 769 770 if (archive_entry_ctime(entry_main) != 0 || 771 archive_entry_ctime_nsec(entry_main) != 0) 772 add_pax_attr_time(&(pax->pax_header), "ctime", 773 archive_entry_ctime(entry_main), 774 archive_entry_ctime_nsec(entry_main)); 775 776 if (archive_entry_atime(entry_main) != 0 || 777 archive_entry_atime_nsec(entry_main) != 0) 778 add_pax_attr_time(&(pax->pax_header), "atime", 779 archive_entry_atime(entry_main), 780 archive_entry_atime_nsec(entry_main)); 781 782 /* Store birth/creationtime only if it's earlier than mtime */ 783 if (archive_entry_birthtime_is_set(entry_main) && 784 archive_entry_birthtime(entry_main) 785 < archive_entry_mtime(entry_main)) 786 add_pax_attr_time(&(pax->pax_header), 787 "LIBARCHIVE.creationtime", 788 archive_entry_birthtime(entry_main), 789 archive_entry_birthtime_nsec(entry_main)); 790 791 /* I use a star-compatible file flag attribute. */ 792 p = archive_entry_fflags_text(entry_main); 793 if (p != NULL && *p != '\0') 794 add_pax_attr(&(pax->pax_header), "SCHILY.fflags", p); 795 796 /* I use star-compatible ACL attributes. */ 797 wp = archive_entry_acl_text_w(entry_original, 798 ARCHIVE_ENTRY_ACL_TYPE_ACCESS | 799 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID); 800 if (wp != NULL && *wp != L'\0') 801 add_pax_attr_w(&(pax->pax_header), 802 "SCHILY.acl.access", wp); 803 wp = archive_entry_acl_text_w(entry_original, 804 ARCHIVE_ENTRY_ACL_TYPE_DEFAULT | 805 ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID); 806 if (wp != NULL && *wp != L'\0') 807 add_pax_attr_w(&(pax->pax_header), 808 "SCHILY.acl.default", wp); 809 810 /* Include star-compatible metadata info. */ 811 /* Note: "SCHILY.dev{major,minor}" are NOT the 812 * major/minor portions of "SCHILY.dev". */ 813 add_pax_attr_int(&(pax->pax_header), "SCHILY.dev", 814 archive_entry_dev(entry_main)); 815 add_pax_attr_int(&(pax->pax_header), "SCHILY.ino", 816 archive_entry_ino(entry_main)); 817 add_pax_attr_int(&(pax->pax_header), "SCHILY.nlink", 818 archive_entry_nlink(entry_main)); 819 820 /* Store extended attributes */ 821 archive_write_pax_header_xattrs(pax, entry_original); 822 } 823 824 /* Only regular files have data. */ 825 if (archive_entry_filetype(entry_main) != AE_IFREG) 826 archive_entry_set_size(entry_main, 0); 827 828 /* 829 * Pax-restricted does not store data for hardlinks, in order 830 * to improve compatibility with ustar. 831 */ 832 if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE && 833 hardlink != NULL) 834 archive_entry_set_size(entry_main, 0); 835 836 /* 837 * XXX Full pax interchange format does permit a hardlink 838 * entry to have data associated with it. I'm not supporting 839 * that here because the client expects me to tell them whether 840 * or not this format expects data for hardlinks. If I 841 * don't check here, then every pax archive will end up with 842 * duplicated data for hardlinks. Someday, there may be 843 * need to select this behavior, in which case the following 844 * will need to be revisited. XXX 845 */ 846 if (hardlink != NULL) 847 archive_entry_set_size(entry_main, 0); 848 849 /* Format 'ustar' header for main entry. 850 * 851 * The trouble with file size: If the reader can't understand 852 * the file size, they may not be able to locate the next 853 * entry and the rest of the archive is toast. Pax-compliant 854 * readers are supposed to ignore the file size in the main 855 * header, so the question becomes how to maximize portability 856 * for readers that don't support pax attribute extensions. 857 * For maximum compatibility, I permit numeric extensions in 858 * the main header so that the file size stored will always be 859 * correct, even if it's in a format that only some 860 * implementations understand. The technique used here is: 861 * 862 * a) If possible, follow the standard exactly. This handles 863 * files up to 8 gigabytes minus 1. 864 * 865 * b) If that fails, try octal but omit the field terminator. 866 * That handles files up to 64 gigabytes minus 1. 867 * 868 * c) Otherwise, use base-256 extensions. That handles files 869 * up to 2^63 in this implementation, with the potential to 870 * go up to 2^94. That should hold us for a while. ;-) 871 * 872 * The non-strict formatter uses similar logic for other 873 * numeric fields, though they're less critical. 874 */ 875 __archive_write_format_header_ustar(a, ustarbuff, entry_main, -1, 0); 876 877 /* If we built any extended attributes, write that entry first. */ 878 if (archive_strlen(&(pax->pax_header)) > 0) { 879 struct archive_entry *pax_attr_entry; 880 time_t s; 881 uid_t uid; 882 gid_t gid; 883 mode_t mode; 884 long ns; 885 886 pax_attr_entry = archive_entry_new(); 887 p = archive_entry_pathname(entry_main); 888 archive_entry_set_pathname(pax_attr_entry, 889 build_pax_attribute_name(pax_entry_name, p)); 890 archive_entry_set_size(pax_attr_entry, 891 archive_strlen(&(pax->pax_header))); 892 /* Copy uid/gid (but clip to ustar limits). */ 893 uid = archive_entry_uid(entry_main); 894 if (uid >= 1 << 18) 895 uid = (1 << 18) - 1; 896 archive_entry_set_uid(pax_attr_entry, uid); 897 gid = archive_entry_gid(entry_main); 898 if (gid >= 1 << 18) 899 gid = (1 << 18) - 1; 900 archive_entry_set_gid(pax_attr_entry, gid); 901 /* Copy mode over (but not setuid/setgid bits) */ 902 mode = archive_entry_mode(entry_main); 903 #ifdef S_ISUID 904 mode &= ~S_ISUID; 905 #endif 906 #ifdef S_ISGID 907 mode &= ~S_ISGID; 908 #endif 909 #ifdef S_ISVTX 910 mode &= ~S_ISVTX; 911 #endif 912 archive_entry_set_mode(pax_attr_entry, mode); 913 914 /* Copy uname/gname. */ 915 archive_entry_set_uname(pax_attr_entry, 916 archive_entry_uname(entry_main)); 917 archive_entry_set_gname(pax_attr_entry, 918 archive_entry_gname(entry_main)); 919 920 /* Copy mtime, but clip to ustar limits. */ 921 s = archive_entry_mtime(entry_main); 922 ns = archive_entry_mtime_nsec(entry_main); 923 if (s < 0) { s = 0; ns = 0; } 924 if (s > 0x7fffffff) { s = 0x7fffffff; ns = 0; } 925 archive_entry_set_mtime(pax_attr_entry, s, ns); 926 927 /* Ditto for atime. */ 928 s = archive_entry_atime(entry_main); 929 ns = archive_entry_atime_nsec(entry_main); 930 if (s < 0) { s = 0; ns = 0; } 931 if (s > 0x7fffffff) { s = 0x7fffffff; ns = 0; } 932 archive_entry_set_atime(pax_attr_entry, s, ns); 933 934 /* Standard ustar doesn't support ctime. */ 935 archive_entry_set_ctime(pax_attr_entry, 0, 0); 936 937 r = __archive_write_format_header_ustar(a, paxbuff, 938 pax_attr_entry, 'x', 1); 939 940 archive_entry_free(pax_attr_entry); 941 942 /* Note that the 'x' header shouldn't ever fail to format */ 943 if (r != 0) { 944 const char *msg = "archive_write_pax_header: " 945 "'x' header failed?! This can't happen.\n"; 946 write(2, msg, strlen(msg)); 947 exit(1); 948 } 949 r = (a->compressor.write)(a, paxbuff, 512); 950 if (r != ARCHIVE_OK) { 951 pax->entry_bytes_remaining = 0; 952 pax->entry_padding = 0; 953 return (ARCHIVE_FATAL); 954 } 955 956 pax->entry_bytes_remaining = archive_strlen(&(pax->pax_header)); 957 pax->entry_padding = 0x1ff & (-(int64_t)pax->entry_bytes_remaining); 958 959 r = (a->compressor.write)(a, pax->pax_header.s, 960 archive_strlen(&(pax->pax_header))); 961 if (r != ARCHIVE_OK) { 962 /* If a write fails, we're pretty much toast. */ 963 return (ARCHIVE_FATAL); 964 } 965 /* Pad out the end of the entry. */ 966 r = write_nulls(a, pax->entry_padding); 967 if (r != ARCHIVE_OK) { 968 /* If a write fails, we're pretty much toast. */ 969 return (ARCHIVE_FATAL); 970 } 971 pax->entry_bytes_remaining = pax->entry_padding = 0; 972 } 973 974 /* Write the header for main entry. */ 975 r = (a->compressor.write)(a, ustarbuff, 512); 976 if (r != ARCHIVE_OK) 977 return (r); 978 979 /* 980 * Inform the client of the on-disk size we're using, so 981 * they can avoid unnecessarily writing a body for something 982 * that we're just going to ignore. 983 */ 984 archive_entry_set_size(entry_original, archive_entry_size(entry_main)); 985 pax->entry_bytes_remaining = archive_entry_size(entry_main); 986 pax->entry_padding = 0x1ff & (-(int64_t)pax->entry_bytes_remaining); 987 archive_entry_free(entry_main); 988 989 return (ret); 990 } 991 992 /* 993 * We need a valid name for the regular 'ustar' entry. This routine 994 * tries to hack something more-or-less reasonable. 995 * 996 * The approach here tries to preserve leading dir names. We do so by 997 * working with four sections: 998 * 1) "prefix" directory names, 999 * 2) "suffix" directory names, 1000 * 3) inserted dir name (optional), 1001 * 4) filename. 1002 * 1003 * These sections must satisfy the following requirements: 1004 * * Parts 1 & 2 together form an initial portion of the dir name. 1005 * * Part 3 is specified by the caller. (It should not contain a leading 1006 * or trailing '/'.) 1007 * * Part 4 forms an initial portion of the base filename. 1008 * * The filename must be <= 99 chars to fit the ustar 'name' field. 1009 * * Parts 2, 3, 4 together must be <= 99 chars to fit the ustar 'name' fld. 1010 * * Part 1 must be <= 155 chars to fit the ustar 'prefix' field. 1011 * * If the original name ends in a '/', the new name must also end in a '/' 1012 * * Trailing '/.' sequences may be stripped. 1013 * 1014 * Note: Recall that the ustar format does not store the '/' separating 1015 * parts 1 & 2, but does store the '/' separating parts 2 & 3. 1016 */ 1017 static char * 1018 build_ustar_entry_name(char *dest, const char *src, size_t src_length, 1019 const char *insert) 1020 { 1021 const char *prefix, *prefix_end; 1022 const char *suffix, *suffix_end; 1023 const char *filename, *filename_end; 1024 char *p; 1025 int need_slash = 0; /* Was there a trailing slash? */ 1026 size_t suffix_length = 99; 1027 int insert_length; 1028 1029 /* Length of additional dir element to be added. */ 1030 if (insert == NULL) 1031 insert_length = 0; 1032 else 1033 /* +2 here allows for '/' before and after the insert. */ 1034 insert_length = strlen(insert) + 2; 1035 1036 /* Step 0: Quick bailout in a common case. */ 1037 if (src_length < 100 && insert == NULL) { 1038 strncpy(dest, src, src_length); 1039 dest[src_length] = '\0'; 1040 return (dest); 1041 } 1042 1043 /* Step 1: Locate filename and enforce the length restriction. */ 1044 filename_end = src + src_length; 1045 /* Remove trailing '/' chars and '/.' pairs. */ 1046 for (;;) { 1047 if (filename_end > src && filename_end[-1] == '/') { 1048 filename_end --; 1049 need_slash = 1; /* Remember to restore trailing '/'. */ 1050 continue; 1051 } 1052 if (filename_end > src + 1 && filename_end[-1] == '.' 1053 && filename_end[-2] == '/') { 1054 filename_end -= 2; 1055 need_slash = 1; /* "foo/." will become "foo/" */ 1056 continue; 1057 } 1058 break; 1059 } 1060 if (need_slash) 1061 suffix_length--; 1062 /* Find start of filename. */ 1063 filename = filename_end - 1; 1064 while ((filename > src) && (*filename != '/')) 1065 filename --; 1066 if ((*filename == '/') && (filename < filename_end - 1)) 1067 filename ++; 1068 /* Adjust filename_end so that filename + insert fits in 99 chars. */ 1069 suffix_length -= insert_length; 1070 if (filename_end > filename + suffix_length) 1071 filename_end = filename + suffix_length; 1072 /* Calculate max size for "suffix" section (#3 above). */ 1073 suffix_length -= filename_end - filename; 1074 1075 /* Step 2: Locate the "prefix" section of the dirname, including 1076 * trailing '/'. */ 1077 prefix = src; 1078 prefix_end = prefix + 155; 1079 if (prefix_end > filename) 1080 prefix_end = filename; 1081 while (prefix_end > prefix && *prefix_end != '/') 1082 prefix_end--; 1083 if ((prefix_end < filename) && (*prefix_end == '/')) 1084 prefix_end++; 1085 1086 /* Step 3: Locate the "suffix" section of the dirname, 1087 * including trailing '/'. */ 1088 suffix = prefix_end; 1089 suffix_end = suffix + suffix_length; /* Enforce limit. */ 1090 if (suffix_end > filename) 1091 suffix_end = filename; 1092 if (suffix_end < suffix) 1093 suffix_end = suffix; 1094 while (suffix_end > suffix && *suffix_end != '/') 1095 suffix_end--; 1096 if ((suffix_end < filename) && (*suffix_end == '/')) 1097 suffix_end++; 1098 1099 /* Step 4: Build the new name. */ 1100 /* The OpenBSD strlcpy function is safer, but less portable. */ 1101 /* Rather than maintain two versions, just use the strncpy version. */ 1102 p = dest; 1103 if (prefix_end > prefix) { 1104 strncpy(p, prefix, prefix_end - prefix); 1105 p += prefix_end - prefix; 1106 } 1107 if (suffix_end > suffix) { 1108 strncpy(p, suffix, suffix_end - suffix); 1109 p += suffix_end - suffix; 1110 } 1111 if (insert != NULL) { 1112 /* Note: assume insert does not have leading or trailing '/' */ 1113 strcpy(p, insert); 1114 p += strlen(insert); 1115 *p++ = '/'; 1116 } 1117 strncpy(p, filename, filename_end - filename); 1118 p += filename_end - filename; 1119 if (need_slash) 1120 *p++ = '/'; 1121 *p++ = '\0'; 1122 1123 return (dest); 1124 } 1125 1126 /* 1127 * The ustar header for the pax extended attributes must have a 1128 * reasonable name: SUSv3 requires 'dirname'/PaxHeader.'pid'/'filename' 1129 * where 'pid' is the PID of the archiving process. Unfortunately, 1130 * that makes testing a pain since the output varies for each run, 1131 * so I'm sticking with the simpler 'dirname'/PaxHeader/'filename' 1132 * for now. (Someday, I'll make this settable. Then I can use the 1133 * SUS recommendation as default and test harnesses can override it 1134 * to get predictable results.) 1135 * 1136 * Joerg Schilling has argued that this is unnecessary because, in 1137 * practice, if the pax extended attributes get extracted as regular 1138 * files, noone is going to bother reading those attributes to 1139 * manually restore them. Based on this, 'star' uses 1140 * /tmp/PaxHeader/'basename' as the ustar header name. This is a 1141 * tempting argument, in part because it's simpler than the SUSv3 1142 * recommendation, but I'm not entirely convinced. I'm also 1143 * uncomfortable with the fact that "/tmp" is a Unix-ism. 1144 * 1145 * The following routine leverages build_ustar_entry_name() above and 1146 * so is simpler than you might think. It just needs to provide the 1147 * additional path element and handle a few pathological cases). 1148 */ 1149 static char * 1150 build_pax_attribute_name(char *dest, const char *src) 1151 { 1152 char buff[64]; 1153 const char *p; 1154 1155 /* Handle the null filename case. */ 1156 if (src == NULL || *src == '\0') { 1157 strcpy(dest, "PaxHeader/blank"); 1158 return (dest); 1159 } 1160 1161 /* Prune final '/' and other unwanted final elements. */ 1162 p = src + strlen(src); 1163 for (;;) { 1164 /* Ends in "/", remove the '/' */ 1165 if (p > src && p[-1] == '/') { 1166 --p; 1167 continue; 1168 } 1169 /* Ends in "/.", remove the '.' */ 1170 if (p > src + 1 && p[-1] == '.' 1171 && p[-2] == '/') { 1172 --p; 1173 continue; 1174 } 1175 break; 1176 } 1177 1178 /* Pathological case: After above, there was nothing left. 1179 * This includes "/." "/./." "/.//./." etc. */ 1180 if (p == src) { 1181 strcpy(dest, "/PaxHeader/rootdir"); 1182 return (dest); 1183 } 1184 1185 /* Convert unadorned "." into a suitable filename. */ 1186 if (*src == '.' && p == src + 1) { 1187 strcpy(dest, "PaxHeader/currentdir"); 1188 return (dest); 1189 } 1190 1191 /* 1192 * TODO: Push this string into the 'pax' structure to avoid 1193 * recomputing it every time. That will also open the door 1194 * to having clients override it. 1195 */ 1196 #if HAVE_GETPID && 0 /* Disable this for now; see above comment. */ 1197 sprintf(buff, "PaxHeader.%d", getpid()); 1198 #else 1199 /* If the platform can't fetch the pid, don't include it. */ 1200 strcpy(buff, "PaxHeader"); 1201 #endif 1202 /* General case: build a ustar-compatible name adding "/PaxHeader/". */ 1203 build_ustar_entry_name(dest, src, p - src, buff); 1204 1205 return (dest); 1206 } 1207 1208 /* Write two null blocks for the end of archive */ 1209 static int 1210 archive_write_pax_finish(struct archive_write *a) 1211 { 1212 struct pax *pax; 1213 int r; 1214 1215 if (a->compressor.write == NULL) 1216 return (ARCHIVE_OK); 1217 1218 pax = (struct pax *)a->format_data; 1219 r = write_nulls(a, 512 * 2); 1220 return (r); 1221 } 1222 1223 static int 1224 archive_write_pax_destroy(struct archive_write *a) 1225 { 1226 struct pax *pax; 1227 1228 pax = (struct pax *)a->format_data; 1229 if (pax == NULL) 1230 return (ARCHIVE_OK); 1231 1232 archive_string_free(&pax->pax_header); 1233 free(pax); 1234 a->format_data = NULL; 1235 return (ARCHIVE_OK); 1236 } 1237 1238 static int 1239 archive_write_pax_finish_entry(struct archive_write *a) 1240 { 1241 struct pax *pax; 1242 int ret; 1243 1244 pax = (struct pax *)a->format_data; 1245 ret = write_nulls(a, pax->entry_bytes_remaining + pax->entry_padding); 1246 pax->entry_bytes_remaining = pax->entry_padding = 0; 1247 return (ret); 1248 } 1249 1250 static int 1251 write_nulls(struct archive_write *a, size_t padding) 1252 { 1253 int ret, to_write; 1254 1255 while (padding > 0) { 1256 to_write = padding < a->null_length ? padding : a->null_length; 1257 ret = (a->compressor.write)(a, a->nulls, to_write); 1258 if (ret != ARCHIVE_OK) 1259 return (ret); 1260 padding -= to_write; 1261 } 1262 return (ARCHIVE_OK); 1263 } 1264 1265 static ssize_t 1266 archive_write_pax_data(struct archive_write *a, const void *buff, size_t s) 1267 { 1268 struct pax *pax; 1269 int ret; 1270 1271 pax = (struct pax *)a->format_data; 1272 if (s > pax->entry_bytes_remaining) 1273 s = pax->entry_bytes_remaining; 1274 1275 ret = (a->compressor.write)(a, buff, s); 1276 pax->entry_bytes_remaining -= s; 1277 if (ret == ARCHIVE_OK) 1278 return (s); 1279 else 1280 return (ret); 1281 } 1282 1283 static int 1284 has_non_ASCII(const wchar_t *wp) 1285 { 1286 if (wp == NULL) 1287 return (1); 1288 while (*wp != L'\0' && *wp < 128) 1289 wp++; 1290 return (*wp != L'\0'); 1291 } 1292 1293 /* 1294 * Used by extended attribute support; encodes the name 1295 * so that there will be no '=' characters in the result. 1296 */ 1297 static char * 1298 url_encode(const char *in) 1299 { 1300 const char *s; 1301 char *d; 1302 int out_len = 0; 1303 char *out; 1304 1305 for (s = in; *s != '\0'; s++) { 1306 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') 1307 out_len += 3; 1308 else 1309 out_len++; 1310 } 1311 1312 out = (char *)malloc(out_len + 1); 1313 if (out == NULL) 1314 return (NULL); 1315 1316 for (s = in, d = out; *s != '\0'; s++) { 1317 /* encode any non-printable ASCII character or '%' or '=' */ 1318 if (*s < 33 || *s > 126 || *s == '%' || *s == '=') { 1319 /* URL encoding is '%' followed by two hex digits */ 1320 *d++ = '%'; 1321 *d++ = "0123456789ABCDEF"[0x0f & (*s >> 4)]; 1322 *d++ = "0123456789ABCDEF"[0x0f & *s]; 1323 } else { 1324 *d++ = *s; 1325 } 1326 } 1327 *d = '\0'; 1328 return (out); 1329 } 1330 1331 /* 1332 * Encode a sequence of bytes into a C string using base-64 encoding. 1333 * 1334 * Returns a null-terminated C string allocated with malloc(); caller 1335 * is responsible for freeing the result. 1336 */ 1337 static char * 1338 base64_encode(const char *s, size_t len) 1339 { 1340 static const char digits[64] = 1341 { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O', 1342 'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d', 1343 'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s', 1344 't','u','v','w','x','y','z','0','1','2','3','4','5','6','7', 1345 '8','9','+','/' }; 1346 int v; 1347 char *d, *out; 1348 1349 /* 3 bytes becomes 4 chars, but round up and allow for trailing NUL */ 1350 out = (char *)malloc((len * 4 + 2) / 3 + 1); 1351 if (out == NULL) 1352 return (NULL); 1353 d = out; 1354 1355 /* Convert each group of 3 bytes into 4 characters. */ 1356 while (len >= 3) { 1357 v = (((int)s[0] << 16) & 0xff0000) 1358 | (((int)s[1] << 8) & 0xff00) 1359 | (((int)s[2]) & 0x00ff); 1360 s += 3; 1361 len -= 3; 1362 *d++ = digits[(v >> 18) & 0x3f]; 1363 *d++ = digits[(v >> 12) & 0x3f]; 1364 *d++ = digits[(v >> 6) & 0x3f]; 1365 *d++ = digits[(v) & 0x3f]; 1366 } 1367 /* Handle final group of 1 byte (2 chars) or 2 bytes (3 chars). */ 1368 switch (len) { 1369 case 0: break; 1370 case 1: 1371 v = (((int)s[0] << 16) & 0xff0000); 1372 *d++ = digits[(v >> 18) & 0x3f]; 1373 *d++ = digits[(v >> 12) & 0x3f]; 1374 break; 1375 case 2: 1376 v = (((int)s[0] << 16) & 0xff0000) 1377 | (((int)s[1] << 8) & 0xff00); 1378 *d++ = digits[(v >> 18) & 0x3f]; 1379 *d++ = digits[(v >> 12) & 0x3f]; 1380 *d++ = digits[(v >> 6) & 0x3f]; 1381 break; 1382 } 1383 /* Add trailing NUL character so output is a valid C string. */ 1384 *d++ = '\0'; 1385 return (out); 1386 } 1387