contrib/libarchive/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 1.27 2008/12/06 06:45:15 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             "cpio",
 154             archive_read_format_cpio_bid,
 155             NULL,
 156             archive_read_format_cpio_read_header,
 157             archive_read_format_cpio_read_data,
 158             NULL,
 159             archive_read_format_cpio_cleanup);
 160
 161         if (r != ARCHIVE_OK)
 162                 free(cpio);
 163         return (ARCHIVE_OK);
 164 }
 165
 166
 167 static int
 168 archive_read_format_cpio_bid(struct archive_read *a)
 169 {
 170         const void *h;
 171         const unsigned char *p;
 172         struct cpio *cpio;
 173         int bid;
 174
 175         cpio = (struct cpio *)(a->format->data);
 176
 177         if ((h = __archive_read_ahead(a, 6, NULL)) == NULL)
 178                 return (-1);
 179
 180         p = (const unsigned char *)h;
 181         bid = 0;
 182         if (memcmp(p, "070707", 6) == 0) {
 183                 /* ASCII cpio archive (odc, POSIX.1) */
 184                 cpio->read_header = header_odc;
 185                 bid += 48;
 186                 /*
 187                  * XXX TODO:  More verification; Could check that only octal
 188                  * digits appear in appropriate header locations. XXX
 189                  */
 190         } else if (memcmp(p, "070701", 6) == 0) {
 191                 /* ASCII cpio archive (SVR4 without CRC) */
 192                 cpio->read_header = header_newc;
 193                 bid += 48;
 194                 /*
 195                  * XXX TODO:  More verification; Could check that only hex
 196                  * digits appear in appropriate header locations. XXX
 197                  */
 198         } else if (memcmp(p, "070702", 6) == 0) {
 199                 /* ASCII cpio archive (SVR4 with CRC) */
 200                 /* XXX TODO: Flag that we should check the CRC. XXX */
 201                 cpio->read_header = header_newc;
 202                 bid += 48;
 203                 /*
 204                  * XXX TODO:  More verification; Could check that only hex
 205                  * digits appear in appropriate header locations. XXX
 206                  */
 207         } else if (p[0] * 256 + p[1] == 070707) {
 208                 /* big-endian binary cpio archives */
 209                 cpio->read_header = header_bin_be;
 210                 bid += 16;
 211                 /* Is more verification possible here? */
 212         } else if (p[0] + p[1] * 256 == 070707) {
 213                 /* little-endian binary cpio archives */
 214                 cpio->read_header = header_bin_le;
 215                 bid += 16;
 216                 /* Is more verification possible here? */
 217         } else
 218                 return (ARCHIVE_WARN);
 219
 220         return (bid);
 221 }
 222
 223 static int
 224 archive_read_format_cpio_read_header(struct archive_read *a,
 225     struct archive_entry *entry)
 226 {
 227         struct cpio *cpio;
 228         const void *h;
 229         size_t namelength;
 230         size_t name_pad;
 231         int r;
 232
 233         cpio = (struct cpio *)(a->format->data);
 234         r = (cpio->read_header(a, cpio, entry, &namelength, &name_pad));
 235
 236         if (r < ARCHIVE_WARN)
 237                 return (r);
 238
 239         /* Read name from buffer. */
 240         h = __archive_read_ahead(a, namelength + name_pad, NULL);
 241         if (h == NULL)
 242             return (ARCHIVE_FATAL);
 243         __archive_read_consume(a, namelength + name_pad);
 244         archive_strncpy(&cpio->entry_name, (const char *)h, namelength);
 245         archive_entry_set_pathname(entry, cpio->entry_name.s);
 246         cpio->entry_offset = 0;
 247
 248         /* If this is a symlink, read the link contents. */
 249         if (archive_entry_filetype(entry) == AE_IFLNK) {
 250                 h = __archive_read_ahead(a, cpio->entry_bytes_remaining, NULL);
 251                 if (h == NULL)
 252                         return (ARCHIVE_FATAL);
 253                 __archive_read_consume(a, cpio->entry_bytes_remaining);
 254                 archive_strncpy(&cpio->entry_linkname, (const char *)h,
 255                     cpio->entry_bytes_remaining);
 256                 archive_entry_set_symlink(entry, cpio->entry_linkname.s);
 257                 cpio->entry_bytes_remaining = 0;
 258         }
 259
 260         /* Compare name to "TRAILER!!!" to test for end-of-archive. */
 261         if (namelength == 11 && strcmp((const char *)h, "TRAILER!!!") == 0) {
 262             /* TODO: Store file location of start of block. */
 263             archive_set_error(&a->archive, 0, NULL);
 264             return (ARCHIVE_EOF);
 265         }
 266
 267         /* Detect and record hardlinks to previously-extracted entries. */
 268         record_hardlink(cpio, entry);
 269
 270         return (r);
 271 }
 272
 273 static int
 274 archive_read_format_cpio_read_data(struct archive_read *a,
 275     const void **buff, size_t *size, off_t *offset)
 276 {
 277         ssize_t bytes_read;
 278         struct cpio *cpio;
 279
 280         cpio = (struct cpio *)(a->format->data);
 281         if (cpio->entry_bytes_remaining > 0) {
 282                 *buff = __archive_read_ahead(a, 1, &bytes_read);
 283                 if (bytes_read <= 0)
 284                         return (ARCHIVE_FATAL);
 285                 if (bytes_read > cpio->entry_bytes_remaining)
 286                         bytes_read = cpio->entry_bytes_remaining;
 287                 *size = bytes_read;
 288                 *offset = cpio->entry_offset;
 289                 cpio->entry_offset += bytes_read;
 290                 cpio->entry_bytes_remaining -= bytes_read;
 291                 __archive_read_consume(a, bytes_read);
 292                 return (ARCHIVE_OK);
 293         } else {
 294                 while (cpio->entry_padding > 0) {
 295                         *buff = __archive_read_ahead(a, 1, &bytes_read);
 296                         if (bytes_read <= 0)
 297                                 return (ARCHIVE_FATAL);
 298                         if (bytes_read > cpio->entry_padding)
 299                                 bytes_read = cpio->entry_padding;
 300                         __archive_read_consume(a, bytes_read);
 301                         cpio->entry_padding -= bytes_read;
 302                 }
 303                 *buff = NULL;
 304                 *size = 0;
 305                 *offset = cpio->entry_offset;
 306                 return (ARCHIVE_EOF);
 307         }
 308 }
 309
 310 /*
 311  * Skip forward to the next cpio newc header by searching for the
 312  * 07070[12] string.  This should be generalized and merged with
 313  * find_odc_header below.
 314  */
 315 static int
 316 is_hex(const char *p, size_t len)
 317 {
 318         while (len-- > 0) {
 319                 if ((*p >= '0' && *p <= '9')
 320                     || (*p >= 'a' && *p <= 'f')
 321                     || (*p >= 'A' && *p <= 'F'))
 322                         ++p;
 323                 else
 324                         return (0);
 325         }
 326         return (1);
 327 }
 328
 329 static int
 330 find_newc_header(struct archive_read *a)
 331 {
 332         const void *h;
 333         const char *p, *q;
 334         size_t skip, skipped = 0;
 335         ssize_t bytes;
 336
 337         for (;;) {
 338                 h = __archive_read_ahead(a, sizeof(struct cpio_newc_header), &bytes);
 339                 if (h == NULL)
 340                         return (ARCHIVE_FATAL);
 341                 p = h;
 342                 q = p + bytes;
 343
 344                 /* Try the typical case first, then go into the slow search.*/
 345                 if (memcmp("07070", p, 5) == 0
 346                     && (p[5] == '1' || p[5] == '2')
 347                     && is_hex(p, sizeof(struct cpio_newc_header)))
 348                         return (ARCHIVE_OK);
 349
 350                 /*
 351                  * Scan ahead until we find something that looks
 352                  * like an odc header.
 353                  */
 354                 while (p + sizeof(struct cpio_newc_header) < q) {
 355                         switch (p[5]) {
 356                         case '1':
 357                         case '2':
 358                                 if (memcmp("07070", p, 5) == 0
 359                                         && is_hex(p, sizeof(struct cpio_newc_header))) {
 360                                         skip = p - (const char *)h;
 361                                         __archive_read_consume(a, skip);
 362                                         skipped += skip;
 363                                         if (skipped > 0) {
 364                                                 archive_set_error(&a->archive,
 365                                                     0,
 366                                                     "Skipped %d bytes before "
 367                                                     "finding valid header",
 368                                                     (int)skipped);
 369                                                 return (ARCHIVE_WARN);
 370                                         }
 371                                         return (ARCHIVE_OK);
 372                                 }
 373                                 p += 2;
 374                                 break;
 375                         case '0':
 376                                 p++;
 377                                 break;
 378                         default:
 379                                 p += 6;
 380                                 break;
 381                         }
 382                 }
 383                 skip = p - (const char *)h;
 384                 __archive_read_consume(a, skip);
 385                 skipped += skip;
 386         }
 387 }
 388
 389 static int
 390 header_newc(struct archive_read *a, struct cpio *cpio,
 391     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 392 {
 393         const void *h;
 394         const struct cpio_newc_header *header;
 395         int r;
 396
 397         r = find_newc_header(a);
 398         if (r < ARCHIVE_WARN)
 399                 return (r);
 400
 401         /* Read fixed-size portion of header. */
 402         h = __archive_read_ahead(a, sizeof(struct cpio_newc_header), NULL);
 403         if (h == NULL)
 404             return (ARCHIVE_FATAL);
 405         __archive_read_consume(a, sizeof(struct cpio_newc_header));
 406
 407         /* Parse out hex fields. */
 408         header = (const struct cpio_newc_header *)h;
 409
 410         if (memcmp(header->c_magic, "070701", 6) == 0) {
 411                 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_NOCRC;
 412                 a->archive.archive_format_name = "ASCII cpio (SVR4 with no CRC)";
 413         } else if (memcmp(header->c_magic, "070702", 6) == 0) {
 414                 a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_CRC;
 415                 a->archive.archive_format_name = "ASCII cpio (SVR4 with CRC)";
 416         } else {
 417                 /* TODO: Abort here? */
 418         }
 419
 420         archive_entry_set_devmajor(entry, atol16(header->c_devmajor, sizeof(header->c_devmajor)));
 421         archive_entry_set_devminor(entry, atol16(header->c_devminor, sizeof(header->c_devminor)));
 422         archive_entry_set_ino(entry, atol16(header->c_ino, sizeof(header->c_ino)));
 423         archive_entry_set_mode(entry, atol16(header->c_mode, sizeof(header->c_mode)));
 424         archive_entry_set_uid(entry, atol16(header->c_uid, sizeof(header->c_uid)));
 425         archive_entry_set_gid(entry, atol16(header->c_gid, sizeof(header->c_gid)));
 426         archive_entry_set_nlink(entry, atol16(header->c_nlink, sizeof(header->c_nlink)));
 427         archive_entry_set_rdevmajor(entry, atol16(header->c_rdevmajor, sizeof(header->c_rdevmajor)));
 428         archive_entry_set_rdevminor(entry, atol16(header->c_rdevminor, sizeof(header->c_rdevminor)));
 429         archive_entry_set_mtime(entry, atol16(header->c_mtime, sizeof(header->c_mtime)), 0);
 430         *namelength = atol16(header->c_namesize, sizeof(header->c_namesize));
 431         /* Pad name to 2 more than a multiple of 4. */
 432         *name_pad = (2 - *namelength) & 3;
 433
 434         /*
 435          * Note: entry_bytes_remaining is at least 64 bits and
 436          * therefore guaranteed to be big enough for a 33-bit file
 437          * size.
 438          */
 439         cpio->entry_bytes_remaining =
 440             atol16(header->c_filesize, sizeof(header->c_filesize));
 441         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 442         /* Pad file contents to a multiple of 4. */
 443         cpio->entry_padding = 3 & -cpio->entry_bytes_remaining;
 444         return (r);
 445 }
 446
 447 /*
 448  * Skip forward to the next cpio odc header by searching for the
 449  * 070707 string.  This is a hand-optimized search that could
 450  * probably be easily generalized to handle all character-based
 451  * cpio variants.
 452  */
 453 static int
 454 is_octal(const char *p, size_t len)
 455 {
 456         while (len-- > 0) {
 457                 if (*p < '0' || *p > '7')
 458                         return (0);
 459                 ++p;
 460         }
 461         return (1);
 462 }
 463
 464 static int
 465 find_odc_header(struct archive_read *a)
 466 {
 467         const void *h;
 468         const char *p, *q;
 469         size_t skip, skipped = 0;
 470         ssize_t bytes;
 471
 472         for (;;) {
 473                 h = __archive_read_ahead(a, sizeof(struct cpio_odc_header), &bytes);
 474                 if (h == NULL)
 475                         return (ARCHIVE_FATAL);
 476                 p = h;
 477                 q = p + bytes;
 478
 479                 /* Try the typical case first, then go into the slow search.*/
 480                 if (memcmp("070707", p, 6) == 0
 481                     && is_octal(p, sizeof(struct cpio_odc_header)))
 482                         return (ARCHIVE_OK);
 483
 484                 /*
 485                  * Scan ahead until we find something that looks
 486                  * like an odc header.
 487                  */
 488                 while (p + sizeof(struct cpio_odc_header) < q) {
 489                         switch (p[5]) {
 490                         case '7':
 491                                 if (memcmp("070707", p, 6) == 0
 492                                         && is_octal(p, sizeof(struct cpio_odc_header))) {
 493                                         skip = p - (const char *)h;
 494                                         __archive_read_consume(a, skip);
 495                                         skipped += skip;
 496                                         if (skipped > 0) {
 497                                                 archive_set_error(&a->archive,
 498                                                     0,
 499                                                     "Skipped %d bytes before "
 500                                                     "finding valid header",
 501                                                     (int)skipped);
 502                                                 return (ARCHIVE_WARN);
 503                                         }
 504                                         return (ARCHIVE_OK);
 505                                 }
 506                                 p += 2;
 507                                 break;
 508                         case '0':
 509                                 p++;
 510                                 break;
 511                         default:
 512                                 p += 6;
 513                                 break;
 514                         }
 515                 }
 516                 skip = p - (const char *)h;
 517                 __archive_read_consume(a, skip);
 518                 skipped += skip;
 519         }
 520 }
 521
 522 static int
 523 header_odc(struct archive_read *a, struct cpio *cpio,
 524     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 525 {
 526         const void *h;
 527         int r;
 528         const struct cpio_odc_header *header;
 529
 530         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
 531         a->archive.archive_format_name = "POSIX octet-oriented cpio";
 532
 533         /* Find the start of the next header. */
 534         r = find_odc_header(a);
 535         if (r < ARCHIVE_WARN)
 536                 return (r);
 537
 538         /* Read fixed-size portion of header. */
 539         h = __archive_read_ahead(a, sizeof(struct cpio_odc_header), NULL);
 540         if (h == NULL)
 541             return (ARCHIVE_FATAL);
 542         __archive_read_consume(a, sizeof(struct cpio_odc_header));
 543
 544         /* Parse out octal fields. */
 545         header = (const struct cpio_odc_header *)h;
 546
 547         archive_entry_set_dev(entry, atol8(header->c_dev, sizeof(header->c_dev)));
 548         archive_entry_set_ino(entry, atol8(header->c_ino, sizeof(header->c_ino)));
 549         archive_entry_set_mode(entry, atol8(header->c_mode, sizeof(header->c_mode)));
 550         archive_entry_set_uid(entry, atol8(header->c_uid, sizeof(header->c_uid)));
 551         archive_entry_set_gid(entry, atol8(header->c_gid, sizeof(header->c_gid)));
 552         archive_entry_set_nlink(entry, atol8(header->c_nlink, sizeof(header->c_nlink)));
 553         archive_entry_set_rdev(entry, atol8(header->c_rdev, sizeof(header->c_rdev)));
 554         archive_entry_set_mtime(entry, atol8(header->c_mtime, sizeof(header->c_mtime)), 0);
 555         *namelength = atol8(header->c_namesize, sizeof(header->c_namesize));
 556         *name_pad = 0; /* No padding of filename. */
 557
 558         /*
 559          * Note: entry_bytes_remaining is at least 64 bits and
 560          * therefore guaranteed to be big enough for a 33-bit file
 561          * size.
 562          */
 563         cpio->entry_bytes_remaining =
 564             atol8(header->c_filesize, sizeof(header->c_filesize));
 565         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 566         cpio->entry_padding = 0;
 567         return (r);
 568 }
 569
 570 static int
 571 header_bin_le(struct archive_read *a, struct cpio *cpio,
 572     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 573 {
 574         const void *h;
 575         const struct cpio_bin_header *header;
 576
 577         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_LE;
 578         a->archive.archive_format_name = "cpio (little-endian binary)";
 579
 580         /* Read fixed-size portion of header. */
 581         h = __archive_read_ahead(a, sizeof(struct cpio_bin_header), NULL);
 582         if (h == NULL)
 583             return (ARCHIVE_FATAL);
 584         __archive_read_consume(a, sizeof(struct cpio_bin_header));
 585
 586         /* Parse out binary fields. */
 587         header = (const struct cpio_bin_header *)h;
 588
 589         archive_entry_set_dev(entry, header->c_dev[0] + header->c_dev[1] * 256);
 590         archive_entry_set_ino(entry, header->c_ino[0] + header->c_ino[1] * 256);
 591         archive_entry_set_mode(entry, header->c_mode[0] + header->c_mode[1] * 256);
 592         archive_entry_set_uid(entry, header->c_uid[0] + header->c_uid[1] * 256);
 593         archive_entry_set_gid(entry, header->c_gid[0] + header->c_gid[1] * 256);
 594         archive_entry_set_nlink(entry, header->c_nlink[0] + header->c_nlink[1] * 256);
 595         archive_entry_set_rdev(entry, header->c_rdev[0] + header->c_rdev[1] * 256);
 596         archive_entry_set_mtime(entry, le4(header->c_mtime), 0);
 597         *namelength = header->c_namesize[0] + header->c_namesize[1] * 256;
 598         *name_pad = *namelength & 1; /* Pad to even. */
 599
 600         cpio->entry_bytes_remaining = le4(header->c_filesize);
 601         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 602         cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */
 603         return (ARCHIVE_OK);
 604 }
 605
 606 static int
 607 header_bin_be(struct archive_read *a, struct cpio *cpio,
 608     struct archive_entry *entry, size_t *namelength, size_t *name_pad)
 609 {
 610         const void *h;
 611         const struct cpio_bin_header *header;
 612
 613         a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_BE;
 614         a->archive.archive_format_name = "cpio (big-endian binary)";
 615
 616         /* Read fixed-size portion of header. */
 617         h = __archive_read_ahead(a, sizeof(struct cpio_bin_header), NULL);
 618         if (h == NULL)
 619             return (ARCHIVE_FATAL);
 620         __archive_read_consume(a, sizeof(struct cpio_bin_header));
 621
 622         /* Parse out binary fields. */
 623         header = (const struct cpio_bin_header *)h;
 624         archive_entry_set_dev(entry, header->c_dev[0] * 256 + header->c_dev[1]);
 625         archive_entry_set_ino(entry, header->c_ino[0] * 256 + header->c_ino[1]);
 626         archive_entry_set_mode(entry, header->c_mode[0] * 256 + header->c_mode[1]);
 627         archive_entry_set_uid(entry, header->c_uid[0] * 256 + header->c_uid[1]);
 628         archive_entry_set_gid(entry, header->c_gid[0] * 256 + header->c_gid[1]);
 629         archive_entry_set_nlink(entry, header->c_nlink[0] * 256 + header->c_nlink[1]);
 630         archive_entry_set_rdev(entry, header->c_rdev[0] * 256 + header->c_rdev[1]);
 631         archive_entry_set_mtime(entry, be4(header->c_mtime), 0);
 632         *namelength = header->c_namesize[0] * 256 + header->c_namesize[1];
 633         *name_pad = *namelength & 1; /* Pad to even. */
 634
 635         cpio->entry_bytes_remaining = be4(header->c_filesize);
 636         archive_entry_set_size(entry, cpio->entry_bytes_remaining);
 637         cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */
 638         return (ARCHIVE_OK);
 639 }
 640
 641 static int
 642 archive_read_format_cpio_cleanup(struct archive_read *a)
 643 {
 644         struct cpio *cpio;
 645
 646         cpio = (struct cpio *)(a->format->data);
 647         /* Free inode->name map */
 648         while (cpio->links_head != NULL) {
 649                 struct links_entry *lp = cpio->links_head->next;
 650
 651                 if (cpio->links_head->name)
 652                         free(cpio->links_head->name);
 653                 free(cpio->links_head);
 654                 cpio->links_head = lp;
 655         }
 656         archive_string_free(&cpio->entry_name);
 657         free(cpio);
 658         (a->format->data) = NULL;
 659         return (ARCHIVE_OK);
 660 }
 661
 662 static int
 663 le4(const unsigned char *p)
 664 {
 665         return ((p[0]<<16) + (p[1]<<24) + (p[2]<<0) + (p[3]<<8));
 666 }
 667
 668
 669 static int
 670 be4(const unsigned char *p)
 671 {
 672         return (p[0] + (p[1]<<8) + (p[2]<<16) + (p[3]<<24));
 673 }
 674
 675 /*
 676  * Note that this implementation does not (and should not!) obey
 677  * locale settings; you cannot simply substitute strtol here, since
 678  * it does obey locale.
 679  */
 680 static int64_t
 681 atol8(const char *p, unsigned char_cnt)
 682 {
 683         int64_t l;
 684         int digit;
 685
 686         l = 0;
 687         while (char_cnt-- > 0) {
 688                 if (*p >= '0' && *p <= '7')
 689                         digit = *p - '0';
 690                 else
 691                         return (l);
 692                 p++;
 693                 l <<= 3;
 694                 l |= digit;
 695         }
 696         return (l);
 697 }
 698
 699 static int64_t
 700 atol16(const char *p, unsigned char_cnt)
 701 {
 702         int64_t l;
 703         int digit;
 704
 705         l = 0;
 706         while (char_cnt-- > 0) {
 707                 if (*p >= 'a' && *p <= 'f')
 708                         digit = *p - 'a' + 10;
 709                 else if (*p >= 'A' && *p <= 'F')
 710                         digit = *p - 'A' + 10;
 711                 else if (*p >= '0' && *p <= '9')
 712                         digit = *p - '0';
 713                 else
 714                         return (l);
 715                 p++;
 716                 l <<= 4;
 717                 l |= digit;
 718         }
 719         return (l);
 720 }
 721
 722 static void
 723 record_hardlink(struct cpio *cpio, struct archive_entry *entry)
 724 {
 725         struct links_entry      *le;
 726         dev_t dev;
 727         ino_t ino;
 728
 729         dev = archive_entry_dev(entry);
 730         ino = archive_entry_ino(entry);
 731
 732         /*
 733          * First look in the list of multiply-linked files.  If we've
 734          * already dumped it, convert this entry to a hard link entry.
 735          */
 736         for (le = cpio->links_head; le; le = le->next) {
 737                 if (le->dev == dev && le->ino == ino) {
 738                         archive_entry_copy_hardlink(entry, le->name);
 739
 740                         if (--le->links <= 0) {
 741                                 if (le->previous != NULL)
 742                                         le->previous->next = le->next;
 743                                 if (le->next != NULL)
 744                                         le->next->previous = le->previous;
 745                                 if (cpio->links_head == le)
 746                                         cpio->links_head = le->next;
 747                                 free(le->name);
 748                                 free(le);
 749                         }
 750
 751                         return;
 752                 }
 753         }
 754
 755         le = (struct links_entry *)malloc(sizeof(struct links_entry));
 756         if (le == NULL)
 757                 __archive_errx(1, "Out of memory adding file to list");
 758         if (cpio->links_head != NULL)
 759                 cpio->links_head->previous = le;
 760         le->next = cpio->links_head;
 761         le->previous = NULL;
 762         cpio->links_head = le;
 763         le->dev = dev;
 764         le->ino = ino;
 765         le->links = archive_entry_nlink(entry) - 1;
 766         le->name = strdup(archive_entry_pathname(entry));
 767         if (le->name == NULL)
 768                 __archive_errx(1, "Out of memory adding file to list");
 769 }