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_read_support_format_cpio.c,v 1.26 2008/01/15 04:56:48 kientzle Exp $"); 28 29 #ifdef HAVE_ERRNO_H 30 #include <errno.h> 31 #endif 32 /* #include <stdint.h> */ /* See archive_platform.h */ 33 #ifdef HAVE_STDLIB_H 34 #include <stdlib.h> 35 #endif 36 #ifdef HAVE_STRING_H 37 #include <string.h> 38 #endif 39 40 #include "archive.h" 41 #include "archive_entry.h" 42 #include "archive_private.h" 43 #include "archive_read_private.h" 44 45 struct cpio_bin_header { 46 unsigned char c_magic[2]; 47 unsigned char c_dev[2]; 48 unsigned char c_ino[2]; 49 unsigned char c_mode[2]; 50 unsigned char c_uid[2]; 51 unsigned char c_gid[2]; 52 unsigned char c_nlink[2]; 53 unsigned char c_rdev[2]; 54 unsigned char c_mtime[4]; 55 unsigned char c_namesize[2]; 56 unsigned char c_filesize[4]; 57 }; 58 59 struct cpio_odc_header { 60 char c_magic[6]; 61 char c_dev[6]; 62 char c_ino[6]; 63 char c_mode[6]; 64 char c_uid[6]; 65 char c_gid[6]; 66 char c_nlink[6]; 67 char c_rdev[6]; 68 char c_mtime[11]; 69 char c_namesize[6]; 70 char c_filesize[11]; 71 }; 72 73 struct cpio_newc_header { 74 char c_magic[6]; 75 char c_ino[8]; 76 char c_mode[8]; 77 char c_uid[8]; 78 char c_gid[8]; 79 char c_nlink[8]; 80 char c_mtime[8]; 81 char c_filesize[8]; 82 char c_devmajor[8]; 83 char c_devminor[8]; 84 char c_rdevmajor[8]; 85 char c_rdevminor[8]; 86 char c_namesize[8]; 87 char c_crc[8]; 88 }; 89 90 struct links_entry { 91 struct links_entry *next; 92 struct links_entry *previous; 93 int links; 94 dev_t dev; 95 ino_t ino; 96 char *name; 97 }; 98 99 #define CPIO_MAGIC 0x13141516 100 struct cpio { 101 int magic; 102 int (*read_header)(struct archive_read *, struct cpio *, 103 struct archive_entry *, size_t *, size_t *); 104 struct links_entry *links_head; 105 struct archive_string entry_name; 106 struct archive_string entry_linkname; 107 off_t entry_bytes_remaining; 108 off_t entry_offset; 109 off_t entry_padding; 110 }; 111 112 static int64_t atol16(const char *, unsigned); 113 static int64_t atol8(const char *, unsigned); 114 static int archive_read_format_cpio_bid(struct archive_read *); 115 static int archive_read_format_cpio_cleanup(struct archive_read *); 116 static int archive_read_format_cpio_read_data(struct archive_read *, 117 const void **, size_t *, off_t *); 118 static int archive_read_format_cpio_read_header(struct archive_read *, 119 struct archive_entry *); 120 static int be4(const unsigned char *); 121 static int find_odc_header(struct archive_read *); 122 static int find_newc_header(struct archive_read *); 123 static int header_bin_be(struct archive_read *, struct cpio *, 124 struct archive_entry *, size_t *, size_t *); 125 static int header_bin_le(struct archive_read *, struct cpio *, 126 struct archive_entry *, size_t *, size_t *); 127 static int header_newc(struct archive_read *, struct cpio *, 128 struct archive_entry *, size_t *, size_t *); 129 static int header_odc(struct archive_read *, struct cpio *, 130 struct archive_entry *, size_t *, size_t *); 131 static int is_octal(const char *, size_t); 132 static int is_hex(const char *, size_t); 133 static int le4(const unsigned char *); 134 static void record_hardlink(struct cpio *cpio, struct archive_entry *entry); 135 136 int 137 archive_read_support_format_cpio(struct archive *_a) 138 { 139 struct archive_read *a = (struct archive_read *)_a; 140 struct cpio *cpio; 141 int r; 142 143 cpio = (struct cpio *)malloc(sizeof(*cpio)); 144 if (cpio == NULL) { 145 archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data"); 146 return (ARCHIVE_FATAL); 147 } 148 memset(cpio, 0, sizeof(*cpio)); 149 cpio->magic = CPIO_MAGIC; 150 151 r = __archive_read_register_format(a, 152 cpio, 153 archive_read_format_cpio_bid, 154 archive_read_format_cpio_read_header, 155 archive_read_format_cpio_read_data, 156 NULL, 157 archive_read_format_cpio_cleanup); 158 159 if (r != ARCHIVE_OK) 160 free(cpio); 161 return (ARCHIVE_OK); 162 } 163 164 165 static int 166 archive_read_format_cpio_bid(struct archive_read *a) 167 { 168 int bytes_read; 169 const void *h; 170 const unsigned char *p; 171 struct cpio *cpio; 172 int bid; 173 174 cpio = (struct cpio *)(a->format->data); 175 176 bytes_read = (a->decompressor->read_ahead)(a, &h, 6); 177 /* Convert error code into error return. */ 178 if (bytes_read < 0) 179 return ((int)bytes_read); 180 if (bytes_read < 6) 181 return (-1); 182 183 p = (const unsigned char *)h; 184 bid = 0; 185 if (memcmp(p, "070707", 6) == 0) { 186 /* ASCII cpio archive (odc, POSIX.1) */ 187 cpio->read_header = header_odc; 188 bid += 48; 189 /* 190 * XXX TODO: More verification; Could check that only octal 191 * digits appear in appropriate header locations. XXX 192 */ 193 } else if (memcmp(p, "070701", 6) == 0) { 194 /* ASCII cpio archive (SVR4 without CRC) */ 195 cpio->read_header = header_newc; 196 bid += 48; 197 /* 198 * XXX TODO: More verification; Could check that only hex 199 * digits appear in appropriate header locations. XXX 200 */ 201 } else if (memcmp(p, "070702", 6) == 0) { 202 /* ASCII cpio archive (SVR4 with CRC) */ 203 /* XXX TODO: Flag that we should check the CRC. XXX */ 204 cpio->read_header = header_newc; 205 bid += 48; 206 /* 207 * XXX TODO: More verification; Could check that only hex 208 * digits appear in appropriate header locations. XXX 209 */ 210 } else if (p[0] * 256 + p[1] == 070707) { 211 /* big-endian binary cpio archives */ 212 cpio->read_header = header_bin_be; 213 bid += 16; 214 /* Is more verification possible here? */ 215 } else if (p[0] + p[1] * 256 == 070707) { 216 /* little-endian binary cpio archives */ 217 cpio->read_header = header_bin_le; 218 bid += 16; 219 /* Is more verification possible here? */ 220 } else 221 return (ARCHIVE_WARN); 222 223 return (bid); 224 } 225 226 static int 227 archive_read_format_cpio_read_header(struct archive_read *a, 228 struct archive_entry *entry) 229 { 230 struct cpio *cpio; 231 size_t bytes; 232 const void *h; 233 size_t namelength; 234 size_t name_pad; 235 int r; 236 237 cpio = (struct cpio *)(a->format->data); 238 r = (cpio->read_header(a, cpio, entry, &namelength, &name_pad)); 239 240 if (r < ARCHIVE_WARN) 241 return (r); 242 243 /* Read name from buffer. */ 244 bytes = (a->decompressor->read_ahead)(a, &h, namelength + name_pad); 245 if (bytes < namelength + name_pad) 246 return (ARCHIVE_FATAL); 247 (a->decompressor->consume)(a, namelength + name_pad); 248 archive_strncpy(&cpio->entry_name, (const char *)h, namelength); 249 archive_entry_set_pathname(entry, cpio->entry_name.s); 250 cpio->entry_offset = 0; 251 252 /* If this is a symlink, read the link contents. */ 253 if (archive_entry_filetype(entry) == AE_IFLNK) { 254 bytes = (a->decompressor->read_ahead)(a, &h, 255 cpio->entry_bytes_remaining); 256 if ((off_t)bytes < cpio->entry_bytes_remaining) 257 return (ARCHIVE_FATAL); 258 (a->decompressor->consume)(a, cpio->entry_bytes_remaining); 259 archive_strncpy(&cpio->entry_linkname, (const char *)h, 260 cpio->entry_bytes_remaining); 261 archive_entry_set_symlink(entry, cpio->entry_linkname.s); 262 cpio->entry_bytes_remaining = 0; 263 } 264 265 /* Compare name to "TRAILER!!!" to test for end-of-archive. */ 266 if (namelength == 11 && strcmp((const char *)h, "TRAILER!!!") == 0) { 267 /* TODO: Store file location of start of block. */ 268 archive_set_error(&a->archive, 0, NULL); 269 return (ARCHIVE_EOF); 270 } 271 272 /* Detect and record hardlinks to previously-extracted entries. */ 273 record_hardlink(cpio, entry); 274 275 return (r); 276 } 277 278 static int 279 archive_read_format_cpio_read_data(struct archive_read *a, 280 const void **buff, size_t *size, off_t *offset) 281 { 282 ssize_t bytes_read; 283 struct cpio *cpio; 284 285 cpio = (struct cpio *)(a->format->data); 286 if (cpio->entry_bytes_remaining > 0) { 287 bytes_read = (a->decompressor->read_ahead)(a, buff, 1); 288 if (bytes_read <= 0) 289 return (ARCHIVE_FATAL); 290 if (bytes_read > cpio->entry_bytes_remaining) 291 bytes_read = cpio->entry_bytes_remaining; 292 *size = bytes_read; 293 *offset = cpio->entry_offset; 294 cpio->entry_offset += bytes_read; 295 cpio->entry_bytes_remaining -= bytes_read; 296 (a->decompressor->consume)(a, bytes_read); 297 return (ARCHIVE_OK); 298 } else { 299 while (cpio->entry_padding > 0) { 300 bytes_read = (a->decompressor->read_ahead)(a, buff, 1); 301 if (bytes_read <= 0) 302 return (ARCHIVE_FATAL); 303 if (bytes_read > cpio->entry_padding) 304 bytes_read = cpio->entry_padding; 305 (a->decompressor->consume)(a, bytes_read); 306 cpio->entry_padding -= bytes_read; 307 } 308 *buff = NULL; 309 *size = 0; 310 *offset = cpio->entry_offset; 311 return (ARCHIVE_EOF); 312 } 313 } 314 315 /* 316 * Skip forward to the next cpio newc header by searching for the 317 * 07070[12] string. This should be generalized and merged with 318 * find_odc_header below. 319 */ 320 static int 321 is_hex(const char *p, size_t len) 322 { 323 while (len-- > 0) { 324 if ((*p >= '0' && *p <= '9') 325 || (*p >= 'a' && *p <= 'f') 326 || (*p >= 'A' && *p <= 'F')) 327 ++p; 328 else 329 return (0); 330 } 331 return (1); 332 } 333 334 static int 335 find_newc_header(struct archive_read *a) 336 { 337 const void *h; 338 const char *p, *q; 339 size_t skip, bytes, skipped = 0; 340 341 for (;;) { 342 bytes = (a->decompressor->read_ahead)(a, &h, 2048); 343 if (bytes < sizeof(struct cpio_newc_header)) 344 return (ARCHIVE_FATAL); 345 p = h; 346 q = p + bytes; 347 348 /* Try the typical case first, then go into the slow search.*/ 349 if (memcmp("07070", p, 5) == 0 350 && (p[5] == '1' || p[5] == '2') 351 && is_hex(p, sizeof(struct cpio_newc_header))) 352 return (ARCHIVE_OK); 353 354 /* 355 * Scan ahead until we find something that looks 356 * like an odc header. 357 */ 358 while (p + sizeof(struct cpio_newc_header) < q) { 359 switch (p[5]) { 360 case '1': 361 case '2': 362 if (memcmp("07070", p, 5) == 0 363 && is_hex(p, sizeof(struct cpio_newc_header))) { 364 skip = p - (const char *)h; 365 (a->decompressor->consume)(a, skip); 366 skipped += skip; 367 if (skipped > 0) { 368 archive_set_error(&a->archive, 369 0, 370 "Skipped %d bytes before " 371 "finding valid header", 372 (int)skipped); 373 return (ARCHIVE_WARN); 374 } 375 return (ARCHIVE_OK); 376 } 377 p += 2; 378 break; 379 case '0': 380 p++; 381 break; 382 default: 383 p += 6; 384 break; 385 } 386 } 387 skip = p - (const char *)h; 388 (a->decompressor->consume)(a, skip); 389 skipped += skip; 390 } 391 } 392 393 static int 394 header_newc(struct archive_read *a, struct cpio *cpio, 395 struct archive_entry *entry, size_t *namelength, size_t *name_pad) 396 { 397 const void *h; 398 const struct cpio_newc_header *header; 399 size_t bytes; 400 int r; 401 402 r = find_newc_header(a); 403 if (r < ARCHIVE_WARN) 404 return (r); 405 406 /* Read fixed-size portion of header. */ 407 bytes = (a->decompressor->read_ahead)(a, &h, sizeof(struct cpio_newc_header)); 408 if (bytes < sizeof(struct cpio_newc_header)) 409 return (ARCHIVE_FATAL); 410 (a->decompressor->consume)(a, sizeof(struct cpio_newc_header)); 411 412 /* Parse out hex fields. */ 413 header = (const struct cpio_newc_header *)h; 414 415 if (memcmp(header->c_magic, "070701", 6) == 0) { 416 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_NOCRC; 417 a->archive.archive_format_name = "ASCII cpio (SVR4 with no CRC)"; 418 } else if (memcmp(header->c_magic, "070702", 6) == 0) { 419 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_CRC; 420 a->archive.archive_format_name = "ASCII cpio (SVR4 with CRC)"; 421 } else { 422 /* TODO: Abort here? */ 423 } 424 425 archive_entry_set_devmajor(entry, atol16(header->c_devmajor, sizeof(header->c_devmajor))); 426 archive_entry_set_devminor(entry, atol16(header->c_devminor, sizeof(header->c_devminor))); 427 archive_entry_set_ino(entry, atol16(header->c_ino, sizeof(header->c_ino))); 428 archive_entry_set_mode(entry, atol16(header->c_mode, sizeof(header->c_mode))); 429 archive_entry_set_uid(entry, atol16(header->c_uid, sizeof(header->c_uid))); 430 archive_entry_set_gid(entry, atol16(header->c_gid, sizeof(header->c_gid))); 431 archive_entry_set_nlink(entry, atol16(header->c_nlink, sizeof(header->c_nlink))); 432 archive_entry_set_rdevmajor(entry, atol16(header->c_rdevmajor, sizeof(header->c_rdevmajor))); 433 archive_entry_set_rdevminor(entry, atol16(header->c_rdevminor, sizeof(header->c_rdevminor))); 434 archive_entry_set_mtime(entry, atol16(header->c_mtime, sizeof(header->c_mtime)), 0); 435 *namelength = atol16(header->c_namesize, sizeof(header->c_namesize)); 436 /* Pad name to 2 more than a multiple of 4. */ 437 *name_pad = (2 - *namelength) & 3; 438 439 /* 440 * Note: entry_bytes_remaining is at least 64 bits and 441 * therefore guaranteed to be big enough for a 33-bit file 442 * size. 443 */ 444 cpio->entry_bytes_remaining = 445 atol16(header->c_filesize, sizeof(header->c_filesize)); 446 archive_entry_set_size(entry, cpio->entry_bytes_remaining); 447 /* Pad file contents to a multiple of 4. */ 448 cpio->entry_padding = 3 & -cpio->entry_bytes_remaining; 449 return (r); 450 } 451 452 /* 453 * Skip forward to the next cpio odc header by searching for the 454 * 070707 string. This is a hand-optimized search that could 455 * probably be easily generalized to handle all character-based 456 * cpio variants. 457 */ 458 static int 459 is_octal(const char *p, size_t len) 460 { 461 while (len-- > 0) { 462 if (*p < '0' || *p > '7') 463 return (0); 464 ++p; 465 } 466 return (1); 467 } 468 469 static int 470 find_odc_header(struct archive_read *a) 471 { 472 const void *h; 473 const char *p, *q; 474 size_t skip, bytes, skipped = 0; 475 476 for (;;) { 477 bytes = (a->decompressor->read_ahead)(a, &h, 512); 478 if (bytes < sizeof(struct cpio_odc_header)) 479 return (ARCHIVE_FATAL); 480 p = h; 481 q = p + bytes; 482 483 /* Try the typical case first, then go into the slow search.*/ 484 if (memcmp("070707", p, 6) == 0 485 && is_octal(p, sizeof(struct cpio_odc_header))) 486 return (ARCHIVE_OK); 487 488 /* 489 * Scan ahead until we find something that looks 490 * like an odc header. 491 */ 492 while (p + sizeof(struct cpio_odc_header) < q) { 493 switch (p[5]) { 494 case '7': 495 if (memcmp("070707", p, 6) == 0 496 && is_octal(p, sizeof(struct cpio_odc_header))) { 497 skip = p - (const char *)h; 498 (a->decompressor->consume)(a, skip); 499 skipped += skip; 500 if (skipped > 0) { 501 archive_set_error(&a->archive, 502 0, 503 "Skipped %d bytes before " 504 "finding valid header", 505 (int)skipped); 506 return (ARCHIVE_WARN); 507 } 508 return (ARCHIVE_OK); 509 } 510 p += 2; 511 break; 512 case '0': 513 p++; 514 break; 515 default: 516 p += 6; 517 break; 518 } 519 } 520 skip = p - (const char *)h; 521 (a->decompressor->consume)(a, skip); 522 skipped += skip; 523 } 524 } 525 526 static int 527 header_odc(struct archive_read *a, struct cpio *cpio, 528 struct archive_entry *entry, size_t *namelength, size_t *name_pad) 529 { 530 const void *h; 531 int r; 532 const struct cpio_odc_header *header; 533 size_t bytes; 534 535 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX; 536 a->archive.archive_format_name = "POSIX octet-oriented cpio"; 537 538 /* Find the start of the next header. */ 539 r = find_odc_header(a); 540 if (r < ARCHIVE_WARN) 541 return (r); 542 543 /* Read fixed-size portion of header. */ 544 bytes = (a->decompressor->read_ahead)(a, &h, sizeof(struct cpio_odc_header)); 545 if (bytes < sizeof(struct cpio_odc_header)) 546 return (ARCHIVE_FATAL); 547 (a->decompressor->consume)(a, sizeof(struct cpio_odc_header)); 548 549 /* Parse out octal fields. */ 550 header = (const struct cpio_odc_header *)h; 551 552 archive_entry_set_dev(entry, atol8(header->c_dev, sizeof(header->c_dev))); 553 archive_entry_set_ino(entry, atol8(header->c_ino, sizeof(header->c_ino))); 554 archive_entry_set_mode(entry, atol8(header->c_mode, sizeof(header->c_mode))); 555 archive_entry_set_uid(entry, atol8(header->c_uid, sizeof(header->c_uid))); 556 archive_entry_set_gid(entry, atol8(header->c_gid, sizeof(header->c_gid))); 557 archive_entry_set_nlink(entry, atol8(header->c_nlink, sizeof(header->c_nlink))); 558 archive_entry_set_rdev(entry, atol8(header->c_rdev, sizeof(header->c_rdev))); 559 archive_entry_set_mtime(entry, atol8(header->c_mtime, sizeof(header->c_mtime)), 0); 560 *namelength = atol8(header->c_namesize, sizeof(header->c_namesize)); 561 *name_pad = 0; /* No padding of filename. */ 562 563 /* 564 * Note: entry_bytes_remaining is at least 64 bits and 565 * therefore guaranteed to be big enough for a 33-bit file 566 * size. 567 */ 568 cpio->entry_bytes_remaining = 569 atol8(header->c_filesize, sizeof(header->c_filesize)); 570 archive_entry_set_size(entry, cpio->entry_bytes_remaining); 571 cpio->entry_padding = 0; 572 return (r); 573 } 574 575 static int 576 header_bin_le(struct archive_read *a, struct cpio *cpio, 577 struct archive_entry *entry, size_t *namelength, size_t *name_pad) 578 { 579 const void *h; 580 const struct cpio_bin_header *header; 581 size_t bytes; 582 583 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_LE; 584 a->archive.archive_format_name = "cpio (little-endian binary)"; 585 586 /* Read fixed-size portion of header. */ 587 bytes = (a->decompressor->read_ahead)(a, &h, sizeof(struct cpio_bin_header)); 588 if (bytes < sizeof(struct cpio_bin_header)) 589 return (ARCHIVE_FATAL); 590 (a->decompressor->consume)(a, sizeof(struct cpio_bin_header)); 591 592 /* Parse out binary fields. */ 593 header = (const struct cpio_bin_header *)h; 594 595 archive_entry_set_dev(entry, header->c_dev[0] + header->c_dev[1] * 256); 596 archive_entry_set_ino(entry, header->c_ino[0] + header->c_ino[1] * 256); 597 archive_entry_set_mode(entry, header->c_mode[0] + header->c_mode[1] * 256); 598 archive_entry_set_uid(entry, header->c_uid[0] + header->c_uid[1] * 256); 599 archive_entry_set_gid(entry, header->c_gid[0] + header->c_gid[1] * 256); 600 archive_entry_set_nlink(entry, header->c_nlink[0] + header->c_nlink[1] * 256); 601 archive_entry_set_rdev(entry, header->c_rdev[0] + header->c_rdev[1] * 256); 602 archive_entry_set_mtime(entry, le4(header->c_mtime), 0); 603 *namelength = header->c_namesize[0] + header->c_namesize[1] * 256; 604 *name_pad = *namelength & 1; /* Pad to even. */ 605 606 cpio->entry_bytes_remaining = le4(header->c_filesize); 607 archive_entry_set_size(entry, cpio->entry_bytes_remaining); 608 cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */ 609 return (ARCHIVE_OK); 610 } 611 612 static int 613 header_bin_be(struct archive_read *a, struct cpio *cpio, 614 struct archive_entry *entry, size_t *namelength, size_t *name_pad) 615 { 616 const void *h; 617 const struct cpio_bin_header *header; 618 size_t bytes; 619 620 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_BE; 621 a->archive.archive_format_name = "cpio (big-endian binary)"; 622 623 /* Read fixed-size portion of header. */ 624 bytes = (a->decompressor->read_ahead)(a, &h, 625 sizeof(struct cpio_bin_header)); 626 if (bytes < sizeof(struct cpio_bin_header)) 627 return (ARCHIVE_FATAL); 628 (a->decompressor->consume)(a, sizeof(struct cpio_bin_header)); 629 630 /* Parse out binary fields. */ 631 header = (const struct cpio_bin_header *)h; 632 archive_entry_set_dev(entry, header->c_dev[0] * 256 + header->c_dev[1]); 633 archive_entry_set_ino(entry, header->c_ino[0] * 256 + header->c_ino[1]); 634 archive_entry_set_mode(entry, header->c_mode[0] * 256 + header->c_mode[1]); 635 archive_entry_set_uid(entry, header->c_uid[0] * 256 + header->c_uid[1]); 636 archive_entry_set_gid(entry, header->c_gid[0] * 256 + header->c_gid[1]); 637 archive_entry_set_nlink(entry, header->c_nlink[0] * 256 + header->c_nlink[1]); 638 archive_entry_set_rdev(entry, header->c_rdev[0] * 256 + header->c_rdev[1]); 639 archive_entry_set_mtime(entry, be4(header->c_mtime), 0); 640 *namelength = header->c_namesize[0] * 256 + header->c_namesize[1]; 641 *name_pad = *namelength & 1; /* Pad to even. */ 642 643 cpio->entry_bytes_remaining = be4(header->c_filesize); 644 archive_entry_set_size(entry, cpio->entry_bytes_remaining); 645 cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */ 646 return (ARCHIVE_OK); 647 } 648 649 static int 650 archive_read_format_cpio_cleanup(struct archive_read *a) 651 { 652 struct cpio *cpio; 653 654 cpio = (struct cpio *)(a->format->data); 655 /* Free inode->name map */ 656 while (cpio->links_head != NULL) { 657 struct links_entry *lp = cpio->links_head->next; 658 659 if (cpio->links_head->name) 660 free(cpio->links_head->name); 661 free(cpio->links_head); 662 cpio->links_head = lp; 663 } 664 archive_string_free(&cpio->entry_name); 665 free(cpio); 666 (a->format->data) = NULL; 667 return (ARCHIVE_OK); 668 } 669 670 static int 671 le4(const unsigned char *p) 672 { 673 return ((p[0]<<16) + (p[1]<<24) + (p[2]<<0) + (p[3]<<8)); 674 } 675 676 677 static int 678 be4(const unsigned char *p) 679 { 680 return (p[0] + (p[1]<<8) + (p[2]<<16) + (p[3]<<24)); 681 } 682 683 /* 684 * Note that this implementation does not (and should not!) obey 685 * locale settings; you cannot simply substitute strtol here, since 686 * it does obey locale. 687 */ 688 static int64_t 689 atol8(const char *p, unsigned char_cnt) 690 { 691 int64_t l; 692 int digit; 693 694 l = 0; 695 while (char_cnt-- > 0) { 696 if (*p >= '0' && *p <= '7') 697 digit = *p - '0'; 698 else 699 return (l); 700 p++; 701 l <<= 3; 702 l |= digit; 703 } 704 return (l); 705 } 706 707 static int64_t 708 atol16(const char *p, unsigned char_cnt) 709 { 710 int64_t l; 711 int digit; 712 713 l = 0; 714 while (char_cnt-- > 0) { 715 if (*p >= 'a' && *p <= 'f') 716 digit = *p - 'a' + 10; 717 else if (*p >= 'A' && *p <= 'F') 718 digit = *p - 'A' + 10; 719 else if (*p >= '0' && *p <= '9') 720 digit = *p - '0'; 721 else 722 return (l); 723 p++; 724 l <<= 4; 725 l |= digit; 726 } 727 return (l); 728 } 729 730 static void 731 record_hardlink(struct cpio *cpio, struct archive_entry *entry) 732 { 733 struct links_entry *le; 734 dev_t dev; 735 ino_t ino; 736 737 dev = archive_entry_dev(entry); 738 ino = archive_entry_ino(entry); 739 740 /* 741 * First look in the list of multiply-linked files. If we've 742 * already dumped it, convert this entry to a hard link entry. 743 */ 744 for (le = cpio->links_head; le; le = le->next) { 745 if (le->dev == dev && le->ino == ino) { 746 archive_entry_copy_hardlink(entry, le->name); 747 748 if (--le->links <= 0) { 749 if (le->previous != NULL) 750 le->previous->next = le->next; 751 if (le->next != NULL) 752 le->next->previous = le->previous; 753 if (cpio->links_head == le) 754 cpio->links_head = le->next; 755 free(le->name); 756 free(le); 757 } 758 759 return; 760 } 761 } 762 763 le = (struct links_entry *)malloc(sizeof(struct links_entry)); 764 if (le == NULL) 765 __archive_errx(1, "Out of memory adding file to list"); 766 if (cpio->links_head != NULL) 767 cpio->links_head->previous = le; 768 le->next = cpio->links_head; 769 le->previous = NULL; 770 cpio->links_head = le; 771 le->dev = dev; 772 le->ino = ino; 773 le->links = archive_entry_nlink(entry) - 1; 774 le->name = strdup(archive_entry_pathname(entry)); 775 if (le->name == NULL) 776 __archive_errx(1, "Out of memory adding file to list"); 777 } 778