contrib/libarchive-2/libarchive/archive_read_support_format_cpio.c

   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 1.24 2007/05/29 01:00:19 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' && *p < 'a') || *p > 'f') {
 325                         return (0);
 326                 }
 327                 ++p;
 328         }
 329         return (1);
 330 }
 331
 332 static int
 333 find_newc_header(struct archive_read *a)
 334 {
 335         const void *h;
 336         const char *p, *q;
 337         size_t skip, bytes, skipped = 0;
 338
 339         for (;;) {
 340                 bytes = (a->decompressor->read_ahead)(a, &h, 2048);
 341                 if (bytes < sizeof(struct cpio_newc_header))
 342                         return (ARCHIVE_FATAL);
 343                 p = h;
 344                 q = p + bytes;
 345
 346                 /* Try the typical case first, then go into the slow search.*/
 347                 if (memcmp("07070", p, 5) == 0
 348                     && (p[5] == '1' || p[5] == '2')
 349                     && is_hex(p, sizeof(struct cpio_newc_header)))
 350                         return (ARCHIVE_OK);
 351
 352                 /*
 353                  * Scan ahead until we find something that looks
 354                  * like an odc header.
 355                  */
 356                 while (p + sizeof(struct cpio_newc_header) < q) {
 357                         switch (p[5]) {
 358                         case '1':
 359                         case '2':
 360                                 if (memcmp("07070", p, 5) == 0
 361                                         && is_hex(p, sizeof(struct cpio_newc_header))) {
 362                                         skip = p - (const char *)h;
 363                                         (a->decompressor->consume)(a, skip);
 364                                         skipped += skip;
 365                                         if (skipped > 0) {
 366                                                 archive_set_error(&a->archive,
 367                                                     0,
 368                                                     "Skipped %d bytes before "
 369                                                     "finding valid header",
 370                                                     (int)skipped);
 371                                                 return (ARCHIVE_WARN);
 372                                         }
 373                                         return (ARCHIVE_OK);
 374                                 }
 375                                 p += 2;
 376                                 break;
 377                         case '0':
 378                                 p++;
 379                                 break;
 380                         default:
 381                                 p += 6;
 382                                 break;
 383                         }
 384                 }
 385                 skip = p - (const char *)h;
 386                 (a->decompressor->consume)(a, skip);
 387                 skipped += skip;
 388         }
 389 }
 390
 391 static int
 392 header_newc(struct archive_read *a, struct cpio *cpio,
 393     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 394 {
 395         const void *h;
 396         const struct cpio_newc_header *header;
 397         size_t bytes;
 398         int r;
 399
 400         r = find_newc_header(a);
 401         if (r < ARCHIVE_WARN)
 402                 return (r);
 403
 404         /* Read fixed-size portion of header. */
 405         bytes = (a->decompressor->read_ahead)(a, &h, sizeof(struct cpio_newc_header));
 406         if (bytes < sizeof(struct cpio_newc_header))
 407             return (ARCHIVE_FATAL);
 408         (a->decompressor->consume)(a, sizeof(struct cpio_newc_header));
 409
 410         /* Parse out hex fields. */
 411         header = (const struct cpio_newc_header *)h;
 412
 413         if (memcmp(header->c_magic, "070701", 6) == 0) {
 414                 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_NOCRC;
 415                 a->archive.archive_format_name = "ASCII cpio (SVR4 with no CRC)";
 416         } else if (memcmp(header->c_magic, "070702", 6) == 0) {
 417                 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_CRC;
 418                 a->archive.archive_format_name = "ASCII cpio (SVR4 with CRC)";
 419         } else {
 420                 /* TODO: Abort here? */
 421         }
 422
 423         archive_entry_set_devmajor(entry, atol16(header->c_devmajor, sizeof(header->c_devmajor)));
 424         archive_entry_set_devminor(entry, atol16(header->c_devminor, sizeof(header->c_devminor)));
 425         archive_entry_set_ino(entry, atol16(header->c_ino, sizeof(header->c_ino)));
 426         archive_entry_set_mode(entry, atol16(header->c_mode, sizeof(header->c_mode)));
 427         archive_entry_set_uid(entry, atol16(header->c_uid, sizeof(header->c_uid)));
 428         archive_entry_set_gid(entry, atol16(header->c_gid, sizeof(header->c_gid)));
 429         archive_entry_set_nlink(entry, atol16(header->c_nlink, sizeof(header->c_nlink)));
 430         archive_entry_set_rdevmajor(entry, atol16(header->c_rdevmajor, sizeof(header->c_rdevmajor)));
 431         archive_entry_set_rdevminor(entry, atol16(header->c_rdevminor, sizeof(header->c_rdevminor)));
 432         archive_entry_set_mtime(entry, atol16(header->c_mtime, sizeof(header->c_mtime)), 0);
 433         *namelength = atol16(header->c_namesize, sizeof(header->c_namesize));
 434         /* Pad name to 2 more than a multiple of 4. */
 435         *name_pad = (2 - *namelength) & 3;
 436
 437         /*
 438          * Note: entry_bytes_remaining is at least 64 bits and
 439          * therefore guaranteed to be big enough for a 33-bit file
 440          * size.
 441          */
 442         cpio->entry_bytes_remaining =
 443             atol16(header->c_filesize, sizeof(header->c_filesize));
 444         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 445         /* Pad file contents to a multiple of 4. */
 446         cpio->entry_padding = 3 & -cpio->entry_bytes_remaining;
 447         return (r);
 448 }
 449
 450 /*
 451  * Skip forward to the next cpio odc header by searching for the
 452  * 070707 string.  This is a hand-optimized search that could
 453  * probably be easily generalized to handle all character-based
 454  * cpio variants.
 455  */
 456 static int
 457 is_octal(const char *p, size_t len)
 458 {
 459         while (len-- > 0) {
 460                 if (*p < '0' || *p > '7')
 461                         return (0);
 462                 ++p;
 463         }
 464         return (1);
 465 }
 466
 467 static int
 468 find_odc_header(struct archive_read *a)
 469 {
 470         const void *h;
 471         const char *p, *q;
 472         size_t skip, bytes, skipped = 0;
 473
 474         for (;;) {
 475                 bytes = (a->decompressor->read_ahead)(a, &h, 512);
 476                 if (bytes < sizeof(struct cpio_odc_header))
 477                         return (ARCHIVE_FATAL);
 478                 p = h;
 479                 q = p + bytes;
 480
 481                 /* Try the typical case first, then go into the slow search.*/
 482                 if (memcmp("070707", p, 6) == 0
 483                     && is_octal(p, sizeof(struct cpio_odc_header)))
 484                         return (ARCHIVE_OK);
 485
 486                 /*
 487                  * Scan ahead until we find something that looks
 488                  * like an odc header.
 489                  */
 490                 while (p + sizeof(struct cpio_odc_header) < q) {
 491                         switch (p[5]) {
 492                         case '7':
 493                                 if (memcmp("070707", p, 6) == 0
 494                                         && is_octal(p, sizeof(struct cpio_odc_header))) {
 495                                         skip = p - (const char *)h;
 496                                         (a->decompressor->consume)(a, skip);
 497                                         skipped += skip;
 498                                         if (skipped > 0) {
 499                                                 archive_set_error(&a->archive,
 500                                                     0,
 501                                                     "Skipped %d bytes before "
 502                                                     "finding valid header",
 503                                                     (int)skipped);
 504                                                 return (ARCHIVE_WARN);
 505                                         }
 506                                         return (ARCHIVE_OK);
 507                                 }
 508                                 p += 2;
 509                                 break;
 510                         case '0':
 511                                 p++;
 512                                 break;
 513                         default:
 514                                 p += 6;
 515                                 break;
 516                         }
 517                 }
 518                 skip = p - (const char *)h;
 519                 (a->decompressor->consume)(a, skip);
 520                 skipped += skip;
 521         }
 522 }
 523
 524 static int
 525 header_odc(struct archive_read *a, struct cpio *cpio,
 526     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 527 {
 528         const void *h;
 529         int r;
 530         const struct cpio_odc_header *header;
 531         size_t bytes;
 532
 533         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
 534         a->archive.archive_format_name = "POSIX octet-oriented cpio";
 535
 536         /* Find the start of the next header. */
 537         r = find_odc_header(a);
 538         if (r < ARCHIVE_WARN)
 539                 return (r);
 540
 541         /* Read fixed-size portion of header. */
 542         bytes = (a->decompressor->read_ahead)(a, &h, sizeof(struct cpio_odc_header));
 543         if (bytes < sizeof(struct cpio_odc_header))
 544             return (ARCHIVE_FATAL);
 545         (a->decompressor->consume)(a, sizeof(struct cpio_odc_header));
 546
 547         /* Parse out octal fields. */
 548         header = (const struct cpio_odc_header *)h;
 549
 550         archive_entry_set_dev(entry, atol8(header->c_dev, sizeof(header->c_dev)));
 551         archive_entry_set_ino(entry, atol8(header->c_ino, sizeof(header->c_ino)));
 552         archive_entry_set_mode(entry, atol8(header->c_mode, sizeof(header->c_mode)));
 553         archive_entry_set_uid(entry, atol8(header->c_uid, sizeof(header->c_uid)));
 554         archive_entry_set_gid(entry, atol8(header->c_gid, sizeof(header->c_gid)));
 555         archive_entry_set_nlink(entry, atol8(header->c_nlink, sizeof(header->c_nlink)));
 556         archive_entry_set_rdev(entry, atol8(header->c_rdev, sizeof(header->c_rdev)));
 557         archive_entry_set_mtime(entry, atol8(header->c_mtime, sizeof(header->c_mtime)), 0);
 558         *namelength = atol8(header->c_namesize, sizeof(header->c_namesize));
 559         *name_pad = 0; /* No padding of filename. */
 560
 561         /*
 562          * Note: entry_bytes_remaining is at least 64 bits and
 563          * therefore guaranteed to be big enough for a 33-bit file
 564          * size.
 565          */
 566         cpio->entry_bytes_remaining =
 567             atol8(header->c_filesize, sizeof(header->c_filesize));
 568         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 569         cpio->entry_padding = 0;
 570         return (r);
 571 }
 572
 573 static int
 574 header_bin_le(struct archive_read *a, struct cpio *cpio,
 575     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 576 {
 577         const void *h;
 578         const struct cpio_bin_header *header;
 579         size_t bytes;
 580
 581         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_LE;
 582         a->archive.archive_format_name = "cpio (little-endian binary)";
 583
 584         /* Read fixed-size portion of header. */
 585         bytes = (a->decompressor->read_ahead)(a, &h, sizeof(struct cpio_bin_header));
 586         if (bytes < sizeof(struct cpio_bin_header))
 587             return (ARCHIVE_FATAL);
 588         (a->decompressor->consume)(a, sizeof(struct cpio_bin_header));
 589
 590         /* Parse out binary fields. */
 591         header = (const struct cpio_bin_header *)h;
 592
 593         archive_entry_set_dev(entry, header->c_dev[0] + header->c_dev[1] * 256);
 594         archive_entry_set_ino(entry, header->c_ino[0] + header->c_ino[1] * 256);
 595         archive_entry_set_mode(entry, header->c_mode[0] + header->c_mode[1] * 256);
 596         archive_entry_set_uid(entry, header->c_uid[0] + header->c_uid[1] * 256);
 597         archive_entry_set_gid(entry, header->c_gid[0] + header->c_gid[1] * 256);
 598         archive_entry_set_nlink(entry, header->c_nlink[0] + header->c_nlink[1] * 256);
 599         archive_entry_set_rdev(entry, header->c_rdev[0] + header->c_rdev[1] * 256);
 600         archive_entry_set_mtime(entry, le4(header->c_mtime), 0);
 601         *namelength = header->c_namesize[0] + header->c_namesize[1] * 256;
 602         *name_pad = *namelength & 1; /* Pad to even. */
 603
 604         cpio->entry_bytes_remaining = le4(header->c_filesize);
 605         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 606         cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */
 607         return (ARCHIVE_OK);
 608 }
 609
 610 static int
 611 header_bin_be(struct archive_read *a, struct cpio *cpio,
 612     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 613 {
 614         const void *h;
 615         const struct cpio_bin_header *header;
 616         size_t bytes;
 617
 618         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_BE;
 619         a->archive.archive_format_name = "cpio (big-endian binary)";
 620
 621         /* Read fixed-size portion of header. */
 622         bytes = (a->decompressor->read_ahead)(a, &h,
 623             sizeof(struct cpio_bin_header));
 624         if (bytes < sizeof(struct cpio_bin_header))
 625             return (ARCHIVE_FATAL);
 626         (a->decompressor->consume)(a, sizeof(struct cpio_bin_header));
 627
 628         /* Parse out binary fields. */
 629         header = (const struct cpio_bin_header *)h;
 630         archive_entry_set_dev(entry, header->c_dev[0] * 256 + header->c_dev[1]);
 631         archive_entry_set_ino(entry, header->c_ino[0] * 256 + header->c_ino[1]);
 632         archive_entry_set_mode(entry, header->c_mode[0] * 256 + header->c_mode[1]);
 633         archive_entry_set_uid(entry, header->c_uid[0] * 256 + header->c_uid[1]);
 634         archive_entry_set_gid(entry, header->c_gid[0] * 256 + header->c_gid[1]);
 635         archive_entry_set_nlink(entry, header->c_nlink[0] * 256 + header->c_nlink[1]);
 636         archive_entry_set_rdev(entry, header->c_rdev[0] * 256 + header->c_rdev[1]);
 637         archive_entry_set_mtime(entry, be4(header->c_mtime), 0);
 638         *namelength = header->c_namesize[0] * 256 + header->c_namesize[1];
 639         *name_pad = *namelength & 1; /* Pad to even. */
 640
 641         cpio->entry_bytes_remaining = be4(header->c_filesize);
 642         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 643         cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */
 644         return (ARCHIVE_OK);
 645 }
 646
 647 static int
 648 archive_read_format_cpio_cleanup(struct archive_read *a)
 649 {
 650         struct cpio *cpio;
 651
 652         cpio = (struct cpio *)(a->format->data);
 653         /* Free inode->name map */
 654         while (cpio->links_head != NULL) {
 655                 struct links_entry *lp = cpio->links_head->next;
 656
 657                 if (cpio->links_head->name)
 658                         free(cpio->links_head->name);
 659                 free(cpio->links_head);
 660                 cpio->links_head = lp;
 661         }
 662         archive_string_free(&cpio->entry_name);
 663         free(cpio);
 664         (a->format->data) = NULL;
 665         return (ARCHIVE_OK);
 666 }
 667
 668 static int
 669 le4(const unsigned char *p)
 670 {
 671         return ((p[0]<<16) + (p[1]<<24) + (p[2]<<0) + (p[3]<<8));
 672 }
 673
 674
 675 static int
 676 be4(const unsigned char *p)
 677 {
 678         return (p[0] + (p[1]<<8) + (p[2]<<16) + (p[3]<<24));
 679 }
 680
 681 /*
 682  * Note that this implementation does not (and should not!) obey
 683  * locale settings; you cannot simply substitute strtol here, since
 684  * it does obey locale.
 685  */
 686 static int64_t
 687 atol8(const char *p, unsigned char_cnt)
 688 {
 689         int64_t l;
 690         int digit;
 691
 692         l = 0;
 693         while (char_cnt-- > 0) {
 694                 if (*p >= '0' && *p <= '7')
 695                         digit = *p - '0';
 696                 else
 697                         return (l);
 698                 p++;
 699                 l <<= 3;
 700                 l |= digit;
 701         }
 702         return (l);
 703 }
 704
 705 static int64_t
 706 atol16(const char *p, unsigned char_cnt)
 707 {
 708         int64_t l;
 709         int digit;
 710
 711         l = 0;
 712         while (char_cnt-- > 0) {
 713                 if (*p >= 'a' && *p <= 'f')
 714                         digit = *p - 'a' + 10;
 715                 else if (*p >= 'A' && *p <= 'F')
 716                         digit = *p - 'A' + 10;
 717                 else if (*p >= '0' && *p <= '9')
 718                         digit = *p - '0';
 719                 else
 720                         return (l);
 721                 p++;
 722                 l <<= 4;
 723                 l |= digit;
 724         }
 725         return (l);
 726 }
 727
 728 static void
 729 record_hardlink(struct cpio *cpio, struct archive_entry *entry)
 730 {
 731         struct links_entry      *le;
 732         dev_t dev;
 733         ino_t ino;
 734
 735         dev = archive_entry_dev(entry);
 736         ino = archive_entry_ino(entry);
 737
 738         /*
 739          * First look in the list of multiply-linked files.  If we've
 740          * already dumped it, convert this entry to a hard link entry.
 741          */
 742         for (le = cpio->links_head; le; le = le->next) {
 743                 if (le->dev == dev && le->ino == ino) {
 744                         archive_entry_copy_hardlink(entry, le->name);
 745
 746                         if (--le->links <= 0) {
 747                                 if (le->previous != NULL)
 748                                         le->previous->next = le->next;
 749                                 if (le->next != NULL)
 750                                         le->next->previous = le->previous;
 751                                 if (cpio->links_head == le)
 752                                         cpio->links_head = le->next;
 753                                 free(le->name);
 754                                 free(le);
 755                         }
 756
 757                         return;
 758                 }
 759         }
 760
 761         le = (struct links_entry *)malloc(sizeof(struct links_entry));
 762         if (le == NULL)
 763                 __archive_errx(1, "Out of memory adding file to list");
 764         if (cpio->links_head != NULL)
 765                 cpio->links_head->previous = le;
 766         le->next = cpio->links_head;
 767         le->previous = NULL;
 768         cpio->links_head = le;
 769         le->dev = dev;
 770         le->ino = ino;
 771         le->links = archive_entry_nlink(entry) - 1;
 772         le->name = strdup(archive_entry_pathname(entry));
 773         if (le->name == NULL)
 774                 __archive_errx(1, "Out of memory adding file to list");
 775 }