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Import libarchive-2.4.17. See NEWS for details.
[dragonfly.git] / contrib / libarchive-2 / libarchive / archive_read_support_format_cpio.c
blob2c50abc6b8853177120db27b3f573ab5595c027d
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 }
DragonFly BSD