Merge remote-tracking branch 'origin/vendor/LIBARCHIVE'
[dragonfly.git] / contrib / libarchive / libarchive / archive_read_disk_posix.c
1 /*-
2  * Copyright (c) 2003-2009 Tim Kientzle
3  * Copyright (c) 2010-2012 Michihiro NAKAJIMA
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer
11  *    in this position and unchanged.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 /* This is the tree-walking code for POSIX systems. */
29 #if !defined(_WIN32) || defined(__CYGWIN__)
30
31 #include "archive_platform.h"
32 __FBSDID("$FreeBSD$");
33
34 #ifdef HAVE_SYS_PARAM_H
35 #include <sys/param.h>
36 #endif
37 #ifdef HAVE_SYS_MOUNT_H
38 #include <sys/mount.h>
39 #endif
40 #ifdef HAVE_SYS_STAT_H
41 #include <sys/stat.h>
42 #endif
43 #ifdef HAVE_SYS_STATFS_H
44 #include <sys/statfs.h>
45 #endif
46 #ifdef HAVE_SYS_STATVFS_H
47 #include <sys/statvfs.h>
48 #endif
49 #ifdef HAVE_SYS_TIME_H
50 #include <sys/time.h>
51 #endif
52 #ifdef HAVE_LINUX_MAGIC_H
53 #include <linux/magic.h>
54 #endif
55 #ifdef HAVE_LINUX_FS_H
56 #include <linux/fs.h>
57 #endif
58 /*
59  * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h.
60  * As the include guards don't agree, the order of include is important.
61  */
62 #ifdef HAVE_LINUX_EXT2_FS_H
63 #include <linux/ext2_fs.h>      /* for Linux file flags */
64 #endif
65 #if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__)
66 #include <ext2fs/ext2_fs.h>     /* Linux file flags, broken on Cygwin */
67 #endif
68 #ifdef HAVE_DIRECT_H
69 #include <direct.h>
70 #endif
71 #ifdef HAVE_DIRENT_H
72 #include <dirent.h>
73 #endif
74 #ifdef HAVE_ERRNO_H
75 #include <errno.h>
76 #endif
77 #ifdef HAVE_FCNTL_H
78 #include <fcntl.h>
79 #endif
80 #ifdef HAVE_LIMITS_H
81 #include <limits.h>
82 #endif
83 #ifdef HAVE_STDLIB_H
84 #include <stdlib.h>
85 #endif
86 #ifdef HAVE_STRING_H
87 #include <string.h>
88 #endif
89 #ifdef HAVE_UNISTD_H
90 #include <unistd.h>
91 #endif
92 #ifdef HAVE_SYS_IOCTL_H
93 #include <sys/ioctl.h>
94 #endif
95
96 #include "archive.h"
97 #include "archive_string.h"
98 #include "archive_entry.h"
99 #include "archive_private.h"
100 #include "archive_read_disk_private.h"
101
102 #ifndef HAVE_FCHDIR
103 #error fchdir function required.
104 #endif
105 #ifndef O_BINARY
106 #define O_BINARY        0
107 #endif
108 #ifndef O_CLOEXEC
109 #define O_CLOEXEC       0
110 #endif
111
112 /*-
113  * This is a new directory-walking system that addresses a number
114  * of problems I've had with fts(3).  In particular, it has no
115  * pathname-length limits (other than the size of 'int'), handles
116  * deep logical traversals, uses considerably less memory, and has
117  * an opaque interface (easier to modify in the future).
118  *
119  * Internally, it keeps a single list of "tree_entry" items that
120  * represent filesystem objects that require further attention.
121  * Non-directories are not kept in memory: they are pulled from
122  * readdir(), returned to the client, then freed as soon as possible.
123  * Any directory entry to be traversed gets pushed onto the stack.
124  *
125  * There is surprisingly little information that needs to be kept for
126  * each item on the stack.  Just the name, depth (represented here as the
127  * string length of the parent directory's pathname), and some markers
128  * indicating how to get back to the parent (via chdir("..") for a
129  * regular dir or via fchdir(2) for a symlink).
130  */
131 /*
132  * TODO:
133  *    1) Loop checking.
134  *    3) Arbitrary logical traversals by closing/reopening intermediate fds.
135  */
136
137 struct restore_time {
138         const char              *name;
139         time_t                   mtime;
140         long                     mtime_nsec;
141         time_t                   atime;
142         long                     atime_nsec;
143         mode_t                   filetype;
144         int                      noatime;
145 };
146
147 struct tree_entry {
148         int                      depth;
149         struct tree_entry       *next;
150         struct tree_entry       *parent;
151         struct archive_string    name;
152         size_t                   dirname_length;
153         int64_t                  dev;
154         int64_t                  ino;
155         int                      flags;
156         int                      filesystem_id;
157         /* How to return back to the parent of a symlink. */
158         int                      symlink_parent_fd;
159         /* How to restore time of a directory. */
160         struct restore_time      restore_time;
161 };
162
163 struct filesystem {
164         int64_t         dev;
165         int             synthetic;
166         int             remote;
167         int             noatime;
168 #if defined(USE_READDIR_R)
169         size_t          name_max;
170 #endif
171         long            incr_xfer_size;
172         long            max_xfer_size;
173         long            min_xfer_size;
174         long            xfer_align;
175
176         /*
177          * Buffer used for reading file contents.
178          */
179         /* Exactly allocated memory pointer. */
180         unsigned char   *allocation_ptr;
181         /* Pointer adjusted to the filesystem alignment . */
182         unsigned char   *buff;
183         size_t           buff_size;
184 };
185
186 /* Definitions for tree_entry.flags bitmap. */
187 #define isDir           1  /* This entry is a regular directory. */
188 #define isDirLink       2  /* This entry is a symbolic link to a directory. */
189 #define needsFirstVisit 4  /* This is an initial entry. */
190 #define needsDescent    8  /* This entry needs to be previsited. */
191 #define needsOpen       16 /* This is a directory that needs to be opened. */
192 #define needsAscent     32 /* This entry needs to be postvisited. */
193
194 /*
195  * Local data for this package.
196  */
197 struct tree {
198         struct tree_entry       *stack;
199         struct tree_entry       *current;
200         DIR                     *d;
201 #define INVALID_DIR_HANDLE NULL
202         struct dirent           *de;
203 #if defined(USE_READDIR_R)
204         struct dirent           *dirent;
205         size_t                   dirent_allocated;
206 #endif
207         int                      flags;
208         int                      visit_type;
209         /* Error code from last failed operation. */
210         int                      tree_errno;
211
212         /* Dynamically-sized buffer for holding path */
213         struct archive_string    path;
214
215         /* Last path element */
216         const char              *basename;
217         /* Leading dir length */
218         size_t                   dirname_length;
219
220         int                      depth;
221         int                      openCount;
222         int                      maxOpenCount;
223         int                      initial_dir_fd;
224         int                      working_dir_fd;
225
226         struct stat              lst;
227         struct stat              st;
228         int                      descend;
229         int                      nlink;
230         /* How to restore time of a file. */
231         struct restore_time      restore_time;
232
233         struct entry_sparse {
234                 int64_t          length;
235                 int64_t          offset;
236         }                       *sparse_list, *current_sparse;
237         int                      sparse_count;
238         int                      sparse_list_size;
239
240         char                     initial_symlink_mode;
241         char                     symlink_mode;
242         struct filesystem       *current_filesystem;
243         struct filesystem       *filesystem_table;
244         int                      initial_filesystem_id;
245         int                      current_filesystem_id;
246         int                      max_filesystem_id;
247         int                      allocated_filesystem;
248
249         int                      entry_fd;
250         int                      entry_eof;
251         int64_t                  entry_remaining_bytes;
252         int64_t                  entry_total;
253         unsigned char           *entry_buff;
254         size_t                   entry_buff_size;
255 };
256
257 /* Definitions for tree.flags bitmap. */
258 #define hasStat         16 /* The st entry is valid. */
259 #define hasLstat        32 /* The lst entry is valid. */
260 #define onWorkingDir    64 /* We are on the working dir where we are
261                             * reading directory entry at this time. */
262 #define needsRestoreTimes 128
263 #define onInitialDir    256 /* We are on the initial dir. */
264
265 static int
266 tree_dir_next_posix(struct tree *t);
267
268 #ifdef HAVE_DIRENT_D_NAMLEN
269 /* BSD extension; avoids need for a strlen() call. */
270 #define D_NAMELEN(dp)   (dp)->d_namlen
271 #else
272 #define D_NAMELEN(dp)   (strlen((dp)->d_name))
273 #endif
274
275 /* Initiate/terminate a tree traversal. */
276 static struct tree *tree_open(const char *, int, int);
277 static struct tree *tree_reopen(struct tree *, const char *, int);
278 static void tree_close(struct tree *);
279 static void tree_free(struct tree *);
280 static void tree_push(struct tree *, const char *, int, int64_t, int64_t,
281                 struct restore_time *);
282 static int tree_enter_initial_dir(struct tree *);
283 static int tree_enter_working_dir(struct tree *);
284 static int tree_current_dir_fd(struct tree *);
285
286 /*
287  * tree_next() returns Zero if there is no next entry, non-zero if
288  * there is.  Note that directories are visited three times.
289  * Directories are always visited first as part of enumerating their
290  * parent; that is a "regular" visit.  If tree_descend() is invoked at
291  * that time, the directory is added to a work list and will
292  * subsequently be visited two more times: once just after descending
293  * into the directory ("postdescent") and again just after ascending
294  * back to the parent ("postascent").
295  *
296  * TREE_ERROR_DIR is returned if the descent failed (because the
297  * directory couldn't be opened, for instance).  This is returned
298  * instead of TREE_POSTDESCENT/TREE_POSTASCENT.  TREE_ERROR_DIR is not a
299  * fatal error, but it does imply that the relevant subtree won't be
300  * visited.  TREE_ERROR_FATAL is returned for an error that left the
301  * traversal completely hosed.  Right now, this is only returned for
302  * chdir() failures during ascent.
303  */
304 #define TREE_REGULAR            1
305 #define TREE_POSTDESCENT        2
306 #define TREE_POSTASCENT         3
307 #define TREE_ERROR_DIR          -1
308 #define TREE_ERROR_FATAL        -2
309
310 static int tree_next(struct tree *);
311
312 /*
313  * Return information about the current entry.
314  */
315
316 /*
317  * The current full pathname, length of the full pathname, and a name
318  * that can be used to access the file.  Because tree does use chdir
319  * extensively, the access path is almost never the same as the full
320  * current path.
321  *
322  * TODO: On platforms that support it, use openat()-style operations
323  * to eliminate the chdir() operations entirely while still supporting
324  * arbitrarily deep traversals.  This makes access_path troublesome to
325  * support, of course, which means we'll need a rich enough interface
326  * that clients can function without it.  (In particular, we'll need
327  * tree_current_open() that returns an open file descriptor.)
328  *
329  */
330 static const char *tree_current_path(struct tree *);
331 static const char *tree_current_access_path(struct tree *);
332
333 /*
334  * Request the lstat() or stat() data for the current path.  Since the
335  * tree package needs to do some of this anyway, and caches the
336  * results, you should take advantage of it here if you need it rather
337  * than make a redundant stat() or lstat() call of your own.
338  */
339 static const struct stat *tree_current_stat(struct tree *);
340 static const struct stat *tree_current_lstat(struct tree *);
341 static int      tree_current_is_symblic_link_target(struct tree *);
342
343 /* The following functions use tricks to avoid a certain number of
344  * stat()/lstat() calls. */
345 /* "is_physical_dir" is equivalent to S_ISDIR(tree_current_lstat()->st_mode) */
346 static int tree_current_is_physical_dir(struct tree *);
347 /* "is_dir" is equivalent to S_ISDIR(tree_current_stat()->st_mode) */
348 static int tree_current_is_dir(struct tree *);
349 static int update_current_filesystem(struct archive_read_disk *a,
350                     int64_t dev);
351 static int setup_current_filesystem(struct archive_read_disk *);
352 static int tree_target_is_same_as_parent(struct tree *, const struct stat *);
353
354 static int      _archive_read_disk_open(struct archive *, const char *);
355 static int      _archive_read_free(struct archive *);
356 static int      _archive_read_close(struct archive *);
357 static int      _archive_read_data_block(struct archive *,
358                     const void **, size_t *, int64_t *);
359 static int      _archive_read_next_header(struct archive *,
360                     struct archive_entry **);
361 static int      _archive_read_next_header2(struct archive *,
362                     struct archive_entry *);
363 static const char *trivial_lookup_gname(void *, int64_t gid);
364 static const char *trivial_lookup_uname(void *, int64_t uid);
365 static int      setup_sparse(struct archive_read_disk *, struct archive_entry *);
366 static int      close_and_restore_time(int fd, struct tree *,
367                     struct restore_time *);
368 static int      open_on_current_dir(struct tree *, const char *, int);
369 static int      tree_dup(int);
370
371
372 static struct archive_vtable *
373 archive_read_disk_vtable(void)
374 {
375         static struct archive_vtable av;
376         static int inited = 0;
377
378         if (!inited) {
379                 av.archive_free = _archive_read_free;
380                 av.archive_close = _archive_read_close;
381                 av.archive_read_data_block = _archive_read_data_block;
382                 av.archive_read_next_header = _archive_read_next_header;
383                 av.archive_read_next_header2 = _archive_read_next_header2;
384                 inited = 1;
385         }
386         return (&av);
387 }
388
389 const char *
390 archive_read_disk_gname(struct archive *_a, la_int64_t gid)
391 {
392         struct archive_read_disk *a = (struct archive_read_disk *)_a;
393         if (ARCHIVE_OK != __archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
394                 ARCHIVE_STATE_ANY, "archive_read_disk_gname"))
395                 return (NULL);
396         if (a->lookup_gname == NULL)
397                 return (NULL);
398         return ((*a->lookup_gname)(a->lookup_gname_data, gid));
399 }
400
401 const char *
402 archive_read_disk_uname(struct archive *_a, la_int64_t uid)
403 {
404         struct archive_read_disk *a = (struct archive_read_disk *)_a;
405         if (ARCHIVE_OK != __archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
406                 ARCHIVE_STATE_ANY, "archive_read_disk_uname"))
407                 return (NULL);
408         if (a->lookup_uname == NULL)
409                 return (NULL);
410         return ((*a->lookup_uname)(a->lookup_uname_data, uid));
411 }
412
413 int
414 archive_read_disk_set_gname_lookup(struct archive *_a,
415     void *private_data,
416     const char * (*lookup_gname)(void *private, la_int64_t gid),
417     void (*cleanup_gname)(void *private))
418 {
419         struct archive_read_disk *a = (struct archive_read_disk *)_a;
420         archive_check_magic(&a->archive, ARCHIVE_READ_DISK_MAGIC,
421             ARCHIVE_STATE_ANY, "archive_read_disk_set_gname_lookup");
422
423         if (a->cleanup_gname != NULL && a->lookup_gname_data != NULL)
424                 (a->cleanup_gname)(a->lookup_gname_data);
425
426         a->lookup_gname = lookup_gname;
427         a->cleanup_gname = cleanup_gname;
428         a->lookup_gname_data = private_data;
429         return (ARCHIVE_OK);
430 }
431
432 int
433 archive_read_disk_set_uname_lookup(struct archive *_a,
434     void *private_data,
435     const char * (*lookup_uname)(void *private, la_int64_t uid),
436     void (*cleanup_uname)(void *private))
437 {
438         struct archive_read_disk *a = (struct archive_read_disk *)_a;
439         archive_check_magic(&a->archive, ARCHIVE_READ_DISK_MAGIC,
440             ARCHIVE_STATE_ANY, "archive_read_disk_set_uname_lookup");
441
442         if (a->cleanup_uname != NULL && a->lookup_uname_data != NULL)
443                 (a->cleanup_uname)(a->lookup_uname_data);
444
445         a->lookup_uname = lookup_uname;
446         a->cleanup_uname = cleanup_uname;
447         a->lookup_uname_data = private_data;
448         return (ARCHIVE_OK);
449 }
450
451 /*
452  * Create a new archive_read_disk object and initialize it with global state.
453  */
454 struct archive *
455 archive_read_disk_new(void)
456 {
457         struct archive_read_disk *a;
458
459         a = (struct archive_read_disk *)calloc(1, sizeof(*a));
460         if (a == NULL)
461                 return (NULL);
462         a->archive.magic = ARCHIVE_READ_DISK_MAGIC;
463         a->archive.state = ARCHIVE_STATE_NEW;
464         a->archive.vtable = archive_read_disk_vtable();
465         a->entry = archive_entry_new2(&a->archive);
466         a->lookup_uname = trivial_lookup_uname;
467         a->lookup_gname = trivial_lookup_gname;
468         a->flags = ARCHIVE_READDISK_MAC_COPYFILE;
469         a->open_on_current_dir = open_on_current_dir;
470         a->tree_current_dir_fd = tree_current_dir_fd;
471         a->tree_enter_working_dir = tree_enter_working_dir;
472         return (&a->archive);
473 }
474
475 static int
476 _archive_read_free(struct archive *_a)
477 {
478         struct archive_read_disk *a = (struct archive_read_disk *)_a;
479         int r;
480
481         if (_a == NULL)
482                 return (ARCHIVE_OK);
483         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
484             ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_read_free");
485
486         if (a->archive.state != ARCHIVE_STATE_CLOSED)
487                 r = _archive_read_close(&a->archive);
488         else
489                 r = ARCHIVE_OK;
490
491         tree_free(a->tree);
492         if (a->cleanup_gname != NULL && a->lookup_gname_data != NULL)
493                 (a->cleanup_gname)(a->lookup_gname_data);
494         if (a->cleanup_uname != NULL && a->lookup_uname_data != NULL)
495                 (a->cleanup_uname)(a->lookup_uname_data);
496         archive_string_free(&a->archive.error_string);
497         archive_entry_free(a->entry);
498         a->archive.magic = 0;
499         __archive_clean(&a->archive);
500         free(a);
501         return (r);
502 }
503
504 static int
505 _archive_read_close(struct archive *_a)
506 {
507         struct archive_read_disk *a = (struct archive_read_disk *)_a;
508
509         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
510             ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_read_close");
511
512         if (a->archive.state != ARCHIVE_STATE_FATAL)
513                 a->archive.state = ARCHIVE_STATE_CLOSED;
514
515         tree_close(a->tree);
516
517         return (ARCHIVE_OK);
518 }
519
520 static void
521 setup_symlink_mode(struct archive_read_disk *a, char symlink_mode,
522     int follow_symlinks)
523 {
524         a->symlink_mode = symlink_mode;
525         a->follow_symlinks = follow_symlinks;
526         if (a->tree != NULL) {
527                 a->tree->initial_symlink_mode = a->symlink_mode;
528                 a->tree->symlink_mode = a->symlink_mode;
529         }
530 }
531
532 int
533 archive_read_disk_set_symlink_logical(struct archive *_a)
534 {
535         struct archive_read_disk *a = (struct archive_read_disk *)_a;
536         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
537             ARCHIVE_STATE_ANY, "archive_read_disk_set_symlink_logical");
538         setup_symlink_mode(a, 'L', 1);
539         return (ARCHIVE_OK);
540 }
541
542 int
543 archive_read_disk_set_symlink_physical(struct archive *_a)
544 {
545         struct archive_read_disk *a = (struct archive_read_disk *)_a;
546         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
547             ARCHIVE_STATE_ANY, "archive_read_disk_set_symlink_physical");
548         setup_symlink_mode(a, 'P', 0);
549         return (ARCHIVE_OK);
550 }
551
552 int
553 archive_read_disk_set_symlink_hybrid(struct archive *_a)
554 {
555         struct archive_read_disk *a = (struct archive_read_disk *)_a;
556         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
557             ARCHIVE_STATE_ANY, "archive_read_disk_set_symlink_hybrid");
558         setup_symlink_mode(a, 'H', 1);/* Follow symlinks initially. */
559         return (ARCHIVE_OK);
560 }
561
562 int
563 archive_read_disk_set_atime_restored(struct archive *_a)
564 {
565         struct archive_read_disk *a = (struct archive_read_disk *)_a;
566         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
567             ARCHIVE_STATE_ANY, "archive_read_disk_restore_atime");
568 #ifdef HAVE_UTIMES
569         a->flags |= ARCHIVE_READDISK_RESTORE_ATIME;
570         if (a->tree != NULL)
571                 a->tree->flags |= needsRestoreTimes;
572         return (ARCHIVE_OK);
573 #else
574         /* Display warning and unset flag */
575         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
576             "Cannot restore access time on this system");
577         a->flags &= ~ARCHIVE_READDISK_RESTORE_ATIME;
578         return (ARCHIVE_WARN);
579 #endif
580 }
581
582 int
583 archive_read_disk_set_behavior(struct archive *_a, int flags)
584 {
585         struct archive_read_disk *a = (struct archive_read_disk *)_a;
586         int r = ARCHIVE_OK;
587
588         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
589             ARCHIVE_STATE_ANY, "archive_read_disk_honor_nodump");
590
591         a->flags = flags;
592
593         if (flags & ARCHIVE_READDISK_RESTORE_ATIME)
594                 r = archive_read_disk_set_atime_restored(_a);
595         else {
596                 if (a->tree != NULL)
597                         a->tree->flags &= ~needsRestoreTimes;
598         }
599         return (r);
600 }
601
602 /*
603  * Trivial implementations of gname/uname lookup functions.
604  * These are normally overridden by the client, but these stub
605  * versions ensure that we always have something that works.
606  */
607 static const char *
608 trivial_lookup_gname(void *private_data, int64_t gid)
609 {
610         (void)private_data; /* UNUSED */
611         (void)gid; /* UNUSED */
612         return (NULL);
613 }
614
615 static const char *
616 trivial_lookup_uname(void *private_data, int64_t uid)
617 {
618         (void)private_data; /* UNUSED */
619         (void)uid; /* UNUSED */
620         return (NULL);
621 }
622
623 /*
624  * Allocate memory for the reading buffer adjusted to the filesystem
625  * alignment.
626  */
627 static int
628 setup_suitable_read_buffer(struct archive_read_disk *a)
629 {
630         struct tree *t = a->tree;
631         struct filesystem *cf = t->current_filesystem;
632         size_t asize;
633         size_t s;
634
635         if (cf->allocation_ptr == NULL) {
636                 /* If we couldn't get a filesystem alignment,
637                  * we use 4096 as default value but we won't use
638                  * O_DIRECT to open() and openat() operations. */
639                 long xfer_align = (cf->xfer_align == -1)?4096:cf->xfer_align;
640
641                 if (cf->max_xfer_size != -1)
642                         asize = cf->max_xfer_size + xfer_align;
643                 else {
644                         long incr = cf->incr_xfer_size;
645                         /* Some platform does not set a proper value to
646                          * incr_xfer_size.*/
647                         if (incr < 0)
648                                 incr = cf->min_xfer_size;
649                         if (cf->min_xfer_size < 0) {
650                                 incr = xfer_align;
651                                 asize = xfer_align;
652                         } else
653                                 asize = cf->min_xfer_size;
654
655                         /* Increase a buffer size up to 64K bytes in
656                          * a proper increment size. */
657                         while (asize < 1024*64)
658                                 asize += incr;
659                         /* Take a margin to adjust to the filesystem
660                          * alignment. */
661                         asize += xfer_align;
662                 }
663                 cf->allocation_ptr = malloc(asize);
664                 if (cf->allocation_ptr == NULL) {
665                         archive_set_error(&a->archive, ENOMEM,
666                             "Couldn't allocate memory");
667                         a->archive.state = ARCHIVE_STATE_FATAL;
668                         return (ARCHIVE_FATAL);
669                 }
670
671                 /*
672                  * Calculate proper address for the filesystem.
673                  */
674                 s = (uintptr_t)cf->allocation_ptr;
675                 s %= xfer_align;
676                 if (s > 0)
677                         s = xfer_align - s;
678
679                 /*
680                  * Set a read buffer pointer in the proper alignment of
681                  * the current filesystem.
682                  */
683                 cf->buff = cf->allocation_ptr + s;
684                 cf->buff_size = asize - xfer_align;
685         }
686         return (ARCHIVE_OK);
687 }
688
689 static int
690 _archive_read_data_block(struct archive *_a, const void **buff,
691     size_t *size, int64_t *offset)
692 {
693         struct archive_read_disk *a = (struct archive_read_disk *)_a;
694         struct tree *t = a->tree;
695         int r;
696         ssize_t bytes;
697         size_t buffbytes;
698         int empty_sparse_region = 0;
699
700         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
701             "archive_read_data_block");
702
703         if (t->entry_eof || t->entry_remaining_bytes <= 0) {
704                 r = ARCHIVE_EOF;
705                 goto abort_read_data;
706         }
707
708         /*
709          * Open the current file.
710          */
711         if (t->entry_fd < 0) {
712                 int flags = O_RDONLY | O_BINARY | O_CLOEXEC;
713
714                 /*
715                  * Eliminate or reduce cache effects if we can.
716                  *
717                  * Carefully consider this to be enabled.
718                  */
719 #if defined(O_DIRECT) && 0/* Disabled for now */
720                 if (t->current_filesystem->xfer_align != -1 &&
721                     t->nlink == 1)
722                         flags |= O_DIRECT;
723 #endif
724 #if defined(O_NOATIME)
725                 /*
726                  * Linux has O_NOATIME flag; use it if we need.
727                  */
728                 if ((t->flags & needsRestoreTimes) != 0 &&
729                     t->restore_time.noatime == 0)
730                         flags |= O_NOATIME;
731                 do {
732 #endif
733                         t->entry_fd = open_on_current_dir(t,
734                             tree_current_access_path(t), flags);
735                         __archive_ensure_cloexec_flag(t->entry_fd);
736 #if defined(O_NOATIME)
737                         /*
738                          * When we did open the file with O_NOATIME flag,
739                          * if successful, set 1 to t->restore_time.noatime
740                          * not to restore an atime of the file later.
741                          * if failed by EPERM, retry it without O_NOATIME flag.
742                          */
743                         if (flags & O_NOATIME) {
744                                 if (t->entry_fd >= 0)
745                                         t->restore_time.noatime = 1;
746                                 else if (errno == EPERM) {
747                                         flags &= ~O_NOATIME;
748                                         continue;
749                                 }
750                         }
751                 } while (0);
752 #endif
753                 if (t->entry_fd < 0) {
754                         archive_set_error(&a->archive, errno,
755                             "Couldn't open %s", tree_current_path(t));
756                         r = ARCHIVE_FAILED;
757                         tree_enter_initial_dir(t);
758                         goto abort_read_data;
759                 }
760                 tree_enter_initial_dir(t);
761         }
762
763         /*
764          * Allocate read buffer if not allocated.
765          */
766         if (t->current_filesystem->allocation_ptr == NULL) {
767                 r = setup_suitable_read_buffer(a);
768                 if (r != ARCHIVE_OK) {
769                         a->archive.state = ARCHIVE_STATE_FATAL;
770                         goto abort_read_data;
771                 }
772         }
773         t->entry_buff = t->current_filesystem->buff;
774         t->entry_buff_size = t->current_filesystem->buff_size;
775
776         buffbytes = t->entry_buff_size;
777         if ((int64_t)buffbytes > t->current_sparse->length)
778                 buffbytes = t->current_sparse->length;
779
780         if (t->current_sparse->length == 0)
781                 empty_sparse_region = 1;
782
783         /*
784          * Skip hole.
785          * TODO: Should we consider t->current_filesystem->xfer_align?
786          */
787         if (t->current_sparse->offset > t->entry_total) {
788                 if (lseek(t->entry_fd,
789                     (off_t)t->current_sparse->offset, SEEK_SET) < 0) {
790                         archive_set_error(&a->archive, errno, "Seek error");
791                         r = ARCHIVE_FATAL;
792                         a->archive.state = ARCHIVE_STATE_FATAL;
793                         goto abort_read_data;
794                 }
795                 bytes = t->current_sparse->offset - t->entry_total;
796                 t->entry_remaining_bytes -= bytes;
797                 t->entry_total += bytes;
798         }
799
800         /*
801          * Read file contents.
802          */
803         if (buffbytes > 0) {
804                 bytes = read(t->entry_fd, t->entry_buff, buffbytes);
805                 if (bytes < 0) {
806                         archive_set_error(&a->archive, errno, "Read error");
807                         r = ARCHIVE_FATAL;
808                         a->archive.state = ARCHIVE_STATE_FATAL;
809                         goto abort_read_data;
810                 }
811         } else
812                 bytes = 0;
813         /*
814          * Return an EOF unless we've read a leading empty sparse region, which
815          * is used to represent fully-sparse files.
816         */
817         if (bytes == 0 && !empty_sparse_region) {
818                 /* Get EOF */
819                 t->entry_eof = 1;
820                 r = ARCHIVE_EOF;
821                 goto abort_read_data;
822         }
823         *buff = t->entry_buff;
824         *size = bytes;
825         *offset = t->entry_total;
826         t->entry_total += bytes;
827         t->entry_remaining_bytes -= bytes;
828         if (t->entry_remaining_bytes == 0) {
829                 /* Close the current file descriptor */
830                 close_and_restore_time(t->entry_fd, t, &t->restore_time);
831                 t->entry_fd = -1;
832                 t->entry_eof = 1;
833         }
834         t->current_sparse->offset += bytes;
835         t->current_sparse->length -= bytes;
836         if (t->current_sparse->length == 0 && !t->entry_eof)
837                 t->current_sparse++;
838         return (ARCHIVE_OK);
839
840 abort_read_data:
841         *buff = NULL;
842         *size = 0;
843         *offset = t->entry_total;
844         if (t->entry_fd >= 0) {
845                 /* Close the current file descriptor */
846                 close_and_restore_time(t->entry_fd, t, &t->restore_time);
847                 t->entry_fd = -1;
848         }
849         return (r);
850 }
851
852 static int
853 next_entry(struct archive_read_disk *a, struct tree *t,
854     struct archive_entry *entry)
855 {
856         const struct stat *st; /* info to use for this entry */
857         const struct stat *lst;/* lstat() information */
858         const char *name;
859         int descend, r;
860
861         st = NULL;
862         lst = NULL;
863         t->descend = 0;
864         do {
865                 switch (tree_next(t)) {
866                 case TREE_ERROR_FATAL:
867                         archive_set_error(&a->archive, t->tree_errno,
868                             "%s: Unable to continue traversing directory tree",
869                             tree_current_path(t));
870                         a->archive.state = ARCHIVE_STATE_FATAL;
871                         tree_enter_initial_dir(t);
872                         return (ARCHIVE_FATAL);
873                 case TREE_ERROR_DIR:
874                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
875                             "%s: Couldn't visit directory",
876                             tree_current_path(t));
877                         tree_enter_initial_dir(t);
878                         return (ARCHIVE_FAILED);
879                 case 0:
880                         tree_enter_initial_dir(t);
881                         return (ARCHIVE_EOF);
882                 case TREE_POSTDESCENT:
883                 case TREE_POSTASCENT:
884                         break;
885                 case TREE_REGULAR:
886                         lst = tree_current_lstat(t);
887                         if (lst == NULL) {
888                                 archive_set_error(&a->archive, errno,
889                                     "%s: Cannot stat",
890                                     tree_current_path(t));
891                                 tree_enter_initial_dir(t);
892                                 return (ARCHIVE_FAILED);
893                         }
894                         break;
895                 }       
896         } while (lst == NULL);
897
898 #ifdef __APPLE__
899         if (a->flags & ARCHIVE_READDISK_MAC_COPYFILE) {
900                 /* If we're using copyfile(), ignore "._XXX" files. */
901                 const char *bname = strrchr(tree_current_path(t), '/');
902                 if (bname == NULL)
903                         bname = tree_current_path(t);
904                 else
905                         ++bname;
906                 if (bname[0] == '.' && bname[1] == '_')
907                         return (ARCHIVE_RETRY);
908         }
909 #endif
910
911         archive_entry_copy_pathname(entry, tree_current_path(t));
912         /*
913          * Perform path matching.
914          */
915         if (a->matching) {
916                 r = archive_match_path_excluded(a->matching, entry);
917                 if (r < 0) {
918                         archive_set_error(&(a->archive), errno,
919                             "Failed : %s", archive_error_string(a->matching));
920                         return (r);
921                 }
922                 if (r) {
923                         if (a->excluded_cb_func)
924                                 a->excluded_cb_func(&(a->archive),
925                                     a->excluded_cb_data, entry);
926                         return (ARCHIVE_RETRY);
927                 }
928         }
929
930         /*
931          * Distinguish 'L'/'P'/'H' symlink following.
932          */
933         switch(t->symlink_mode) {
934         case 'H':
935                 /* 'H': After the first item, rest like 'P'. */
936                 t->symlink_mode = 'P';
937                 /* 'H': First item (from command line) like 'L'. */
938                 /* FALLTHROUGH */
939         case 'L':
940                 /* 'L': Do descend through a symlink to dir. */
941                 descend = tree_current_is_dir(t);
942                 /* 'L': Follow symlinks to files. */
943                 a->symlink_mode = 'L';
944                 a->follow_symlinks = 1;
945                 /* 'L': Archive symlinks as targets, if we can. */
946                 st = tree_current_stat(t);
947                 if (st != NULL && !tree_target_is_same_as_parent(t, st))
948                         break;
949                 /* If stat fails, we have a broken symlink;
950                  * in that case, don't follow the link. */
951                 /* FALLTHROUGH */
952         default:
953                 /* 'P': Don't descend through a symlink to dir. */
954                 descend = tree_current_is_physical_dir(t);
955                 /* 'P': Don't follow symlinks to files. */
956                 a->symlink_mode = 'P';
957                 a->follow_symlinks = 0;
958                 /* 'P': Archive symlinks as symlinks. */
959                 st = lst;
960                 break;
961         }
962
963         if (update_current_filesystem(a, st->st_dev) != ARCHIVE_OK) {
964                 a->archive.state = ARCHIVE_STATE_FATAL;
965                 tree_enter_initial_dir(t);
966                 return (ARCHIVE_FATAL);
967         }
968         if (t->initial_filesystem_id == -1)
969                 t->initial_filesystem_id = t->current_filesystem_id;
970         if (a->flags & ARCHIVE_READDISK_NO_TRAVERSE_MOUNTS) {
971                 if (t->initial_filesystem_id != t->current_filesystem_id)
972                         descend = 0;
973         }
974         t->descend = descend;
975
976         /*
977          * Honor nodump flag.
978          * If the file is marked with nodump flag, do not return this entry.
979          */
980         if (a->flags & ARCHIVE_READDISK_HONOR_NODUMP) {
981 #if defined(HAVE_STRUCT_STAT_ST_FLAGS) && defined(UF_NODUMP)
982                 if (st->st_flags & UF_NODUMP)
983                         return (ARCHIVE_RETRY);
984 #elif (defined(FS_IOC_GETFLAGS) && defined(FS_NODUMP_FL) && \
985        defined(HAVE_WORKING_FS_IOC_GETFLAGS)) || \
986       (defined(EXT2_IOC_GETFLAGS) && defined(EXT2_NODUMP_FL) && \
987        defined(HAVE_WORKING_EXT2_IOC_GETFLAGS))
988                 if (S_ISREG(st->st_mode) || S_ISDIR(st->st_mode)) {
989                         int stflags;
990
991                         t->entry_fd = open_on_current_dir(t,
992                             tree_current_access_path(t),
993                             O_RDONLY | O_NONBLOCK | O_CLOEXEC);
994                         __archive_ensure_cloexec_flag(t->entry_fd);
995                         if (t->entry_fd >= 0) {
996                                 r = ioctl(t->entry_fd,
997 #ifdef FS_IOC_GETFLAGS
998                                 FS_IOC_GETFLAGS,
999 #else
1000                                 EXT2_IOC_GETFLAGS,
1001 #endif
1002                                         &stflags);
1003 #ifdef FS_NODUMP_FL
1004                                 if (r == 0 && (stflags & FS_NODUMP_FL) != 0)
1005 #else
1006                                 if (r == 0 && (stflags & EXT2_NODUMP_FL) != 0)
1007 #endif
1008                                         return (ARCHIVE_RETRY);
1009                         }
1010                 }
1011 #endif
1012         }
1013
1014         archive_entry_copy_stat(entry, st);
1015
1016         /* Save the times to be restored. This must be in before
1017          * calling archive_read_disk_descend() or any chance of it,
1018          * especially, invoking a callback. */
1019         t->restore_time.mtime = archive_entry_mtime(entry);
1020         t->restore_time.mtime_nsec = archive_entry_mtime_nsec(entry);
1021         t->restore_time.atime = archive_entry_atime(entry);
1022         t->restore_time.atime_nsec = archive_entry_atime_nsec(entry);
1023         t->restore_time.filetype = archive_entry_filetype(entry);
1024         t->restore_time.noatime = t->current_filesystem->noatime;
1025
1026         /*
1027          * Perform time matching.
1028          */
1029         if (a->matching) {
1030                 r = archive_match_time_excluded(a->matching, entry);
1031                 if (r < 0) {
1032                         archive_set_error(&(a->archive), errno,
1033                             "Failed : %s", archive_error_string(a->matching));
1034                         return (r);
1035                 }
1036                 if (r) {
1037                         if (a->excluded_cb_func)
1038                                 a->excluded_cb_func(&(a->archive),
1039                                     a->excluded_cb_data, entry);
1040                         return (ARCHIVE_RETRY);
1041                 }
1042         }
1043
1044         /* Lookup uname/gname */
1045         name = archive_read_disk_uname(&(a->archive), archive_entry_uid(entry));
1046         if (name != NULL)
1047                 archive_entry_copy_uname(entry, name);
1048         name = archive_read_disk_gname(&(a->archive), archive_entry_gid(entry));
1049         if (name != NULL)
1050                 archive_entry_copy_gname(entry, name);
1051
1052         /*
1053          * Perform owner matching.
1054          */
1055         if (a->matching) {
1056                 r = archive_match_owner_excluded(a->matching, entry);
1057                 if (r < 0) {
1058                         archive_set_error(&(a->archive), errno,
1059                             "Failed : %s", archive_error_string(a->matching));
1060                         return (r);
1061                 }
1062                 if (r) {
1063                         if (a->excluded_cb_func)
1064                                 a->excluded_cb_func(&(a->archive),
1065                                     a->excluded_cb_data, entry);
1066                         return (ARCHIVE_RETRY);
1067                 }
1068         }
1069
1070         /*
1071          * Invoke a meta data filter callback.
1072          */
1073         if (a->metadata_filter_func) {
1074                 if (!a->metadata_filter_func(&(a->archive),
1075                     a->metadata_filter_data, entry))
1076                         return (ARCHIVE_RETRY);
1077         }
1078
1079         /*
1080          * Populate the archive_entry with metadata from the disk.
1081          */
1082         archive_entry_copy_sourcepath(entry, tree_current_access_path(t));
1083         r = archive_read_disk_entry_from_file(&(a->archive), entry,
1084                 t->entry_fd, st);
1085
1086         return (r);
1087 }
1088
1089 static int
1090 _archive_read_next_header(struct archive *_a, struct archive_entry **entryp)
1091 {
1092         int ret;
1093         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1094         *entryp = NULL;
1095         ret = _archive_read_next_header2(_a, a->entry);
1096         *entryp = a->entry;
1097         return ret;
1098 }
1099
1100 static int
1101 _archive_read_next_header2(struct archive *_a, struct archive_entry *entry)
1102 {
1103         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1104         struct tree *t;
1105         int r;
1106
1107         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
1108             ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
1109             "archive_read_next_header2");
1110
1111         t = a->tree;
1112         if (t->entry_fd >= 0) {
1113                 close_and_restore_time(t->entry_fd, t, &t->restore_time);
1114                 t->entry_fd = -1;
1115         }
1116
1117         for (;;) {
1118                 r = next_entry(a, t, entry);
1119                 if (t->entry_fd >= 0) {
1120                         close(t->entry_fd);
1121                         t->entry_fd = -1;
1122                 }
1123
1124                 if (r == ARCHIVE_RETRY) {
1125                         archive_entry_clear(entry);
1126                         continue;
1127                 }
1128                 break;
1129         }
1130
1131         /* Return to the initial directory. */
1132         tree_enter_initial_dir(t);
1133
1134         /*
1135          * EOF and FATAL are persistent at this layer.  By
1136          * modifying the state, we guarantee that future calls to
1137          * read a header or read data will fail.
1138          */
1139         switch (r) {
1140         case ARCHIVE_EOF:
1141                 a->archive.state = ARCHIVE_STATE_EOF;
1142                 break;
1143         case ARCHIVE_OK:
1144         case ARCHIVE_WARN:
1145                 /* Overwrite the sourcepath based on the initial directory. */
1146                 archive_entry_copy_sourcepath(entry, tree_current_path(t));
1147                 t->entry_total = 0;
1148                 if (archive_entry_filetype(entry) == AE_IFREG) {
1149                         t->nlink = archive_entry_nlink(entry);
1150                         t->entry_remaining_bytes = archive_entry_size(entry);
1151                         t->entry_eof = (t->entry_remaining_bytes == 0)? 1: 0;
1152                         if (!t->entry_eof &&
1153                             setup_sparse(a, entry) != ARCHIVE_OK)
1154                                 return (ARCHIVE_FATAL);
1155                 } else {
1156                         t->entry_remaining_bytes = 0;
1157                         t->entry_eof = 1;
1158                 }
1159                 a->archive.state = ARCHIVE_STATE_DATA;
1160                 break;
1161         case ARCHIVE_RETRY:
1162                 break;
1163         case ARCHIVE_FATAL:
1164                 a->archive.state = ARCHIVE_STATE_FATAL;
1165                 break;
1166         }
1167
1168         __archive_reset_read_data(&a->archive);
1169         return (r);
1170 }
1171
1172 static int
1173 setup_sparse(struct archive_read_disk *a, struct archive_entry *entry)
1174 {
1175         struct tree *t = a->tree;
1176         int64_t length, offset;
1177         int i;
1178
1179         t->sparse_count = archive_entry_sparse_reset(entry);
1180         if (t->sparse_count+1 > t->sparse_list_size) {
1181                 free(t->sparse_list);
1182                 t->sparse_list_size = t->sparse_count + 1;
1183                 t->sparse_list = malloc(sizeof(t->sparse_list[0]) *
1184                     t->sparse_list_size);
1185                 if (t->sparse_list == NULL) {
1186                         t->sparse_list_size = 0;
1187                         archive_set_error(&a->archive, ENOMEM,
1188                             "Can't allocate data");
1189                         a->archive.state = ARCHIVE_STATE_FATAL;
1190                         return (ARCHIVE_FATAL);
1191                 }
1192         }
1193         for (i = 0; i < t->sparse_count; i++) {
1194                 archive_entry_sparse_next(entry, &offset, &length);
1195                 t->sparse_list[i].offset = offset;
1196                 t->sparse_list[i].length = length;
1197         }
1198         if (i == 0) {
1199                 t->sparse_list[i].offset = 0;
1200                 t->sparse_list[i].length = archive_entry_size(entry);
1201         } else {
1202                 t->sparse_list[i].offset = archive_entry_size(entry);
1203                 t->sparse_list[i].length = 0;
1204         }
1205         t->current_sparse = t->sparse_list;
1206
1207         return (ARCHIVE_OK);
1208 }
1209
1210 int
1211 archive_read_disk_set_matching(struct archive *_a, struct archive *_ma,
1212     void (*_excluded_func)(struct archive *, void *, struct archive_entry *),
1213     void *_client_data)
1214 {
1215         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1216         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
1217             ARCHIVE_STATE_ANY, "archive_read_disk_set_matching");
1218         a->matching = _ma;
1219         a->excluded_cb_func = _excluded_func;
1220         a->excluded_cb_data = _client_data;
1221         return (ARCHIVE_OK);
1222 }
1223
1224 int
1225 archive_read_disk_set_metadata_filter_callback(struct archive *_a,
1226     int (*_metadata_filter_func)(struct archive *, void *,
1227     struct archive_entry *), void *_client_data)
1228 {
1229         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1230
1231         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_ANY,
1232             "archive_read_disk_set_metadata_filter_callback");
1233
1234         a->metadata_filter_func = _metadata_filter_func;
1235         a->metadata_filter_data = _client_data;
1236         return (ARCHIVE_OK);
1237 }
1238
1239 int
1240 archive_read_disk_can_descend(struct archive *_a)
1241 {
1242         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1243         struct tree *t = a->tree;
1244
1245         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
1246             ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
1247             "archive_read_disk_can_descend");
1248
1249         return (t->visit_type == TREE_REGULAR && t->descend);
1250 }
1251
1252 /*
1253  * Called by the client to mark the directory just returned from
1254  * tree_next() as needing to be visited.
1255  */
1256 int
1257 archive_read_disk_descend(struct archive *_a)
1258 {
1259         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1260         struct tree *t = a->tree;
1261
1262         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
1263             ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
1264             "archive_read_disk_descend");
1265
1266         if (t->visit_type != TREE_REGULAR || !t->descend)
1267                 return (ARCHIVE_OK);
1268
1269         if (tree_current_is_physical_dir(t)) {
1270                 tree_push(t, t->basename, t->current_filesystem_id,
1271                     t->lst.st_dev, t->lst.st_ino, &t->restore_time);
1272                 t->stack->flags |= isDir;
1273         } else if (tree_current_is_dir(t)) {
1274                 tree_push(t, t->basename, t->current_filesystem_id,
1275                     t->st.st_dev, t->st.st_ino, &t->restore_time);
1276                 t->stack->flags |= isDirLink;
1277         }
1278         t->descend = 0;
1279         return (ARCHIVE_OK);
1280 }
1281
1282 int
1283 archive_read_disk_open(struct archive *_a, const char *pathname)
1284 {
1285         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1286
1287         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
1288             ARCHIVE_STATE_NEW | ARCHIVE_STATE_CLOSED,
1289             "archive_read_disk_open");
1290         archive_clear_error(&a->archive);
1291
1292         return (_archive_read_disk_open(_a, pathname));
1293 }
1294
1295 int
1296 archive_read_disk_open_w(struct archive *_a, const wchar_t *pathname)
1297 {
1298         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1299         struct archive_string path;
1300         int ret;
1301
1302         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC,
1303             ARCHIVE_STATE_NEW | ARCHIVE_STATE_CLOSED,
1304             "archive_read_disk_open_w");
1305         archive_clear_error(&a->archive);
1306
1307         /* Make a char string from a wchar_t string. */
1308         archive_string_init(&path);
1309         if (archive_string_append_from_wcs(&path, pathname,
1310             wcslen(pathname)) != 0) {
1311                 if (errno == ENOMEM)
1312                         archive_set_error(&a->archive, ENOMEM,
1313                             "Can't allocate memory");
1314                 else
1315                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1316                             "Can't convert a path to a char string");
1317                 a->archive.state = ARCHIVE_STATE_FATAL;
1318                 ret = ARCHIVE_FATAL;
1319         } else
1320                 ret = _archive_read_disk_open(_a, path.s);
1321
1322         archive_string_free(&path);
1323         return (ret);
1324 }
1325
1326 static int
1327 _archive_read_disk_open(struct archive *_a, const char *pathname)
1328 {
1329         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1330
1331         if (a->tree != NULL)
1332                 a->tree = tree_reopen(a->tree, pathname,
1333                     a->flags & ARCHIVE_READDISK_RESTORE_ATIME);
1334         else
1335                 a->tree = tree_open(pathname, a->symlink_mode,
1336                     a->flags & ARCHIVE_READDISK_RESTORE_ATIME);
1337         if (a->tree == NULL) {
1338                 archive_set_error(&a->archive, ENOMEM,
1339                     "Can't allocate tar data");
1340                 a->archive.state = ARCHIVE_STATE_FATAL;
1341                 return (ARCHIVE_FATAL);
1342         }
1343         a->archive.state = ARCHIVE_STATE_HEADER;
1344
1345         return (ARCHIVE_OK);
1346 }
1347
1348 /*
1349  * Return a current filesystem ID which is index of the filesystem entry
1350  * you've visited through archive_read_disk.
1351  */
1352 int
1353 archive_read_disk_current_filesystem(struct archive *_a)
1354 {
1355         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1356
1357         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
1358             "archive_read_disk_current_filesystem");
1359
1360         return (a->tree->current_filesystem_id);
1361 }
1362
1363 static int
1364 update_current_filesystem(struct archive_read_disk *a, int64_t dev)
1365 {
1366         struct tree *t = a->tree;
1367         int i, fid;
1368
1369         if (t->current_filesystem != NULL &&
1370             t->current_filesystem->dev == dev)
1371                 return (ARCHIVE_OK);
1372
1373         for (i = 0; i < t->max_filesystem_id; i++) {
1374                 if (t->filesystem_table[i].dev == dev) {
1375                         /* There is the filesystem ID we've already generated. */
1376                         t->current_filesystem_id = i;
1377                         t->current_filesystem = &(t->filesystem_table[i]);
1378                         return (ARCHIVE_OK);
1379                 }
1380         }
1381
1382         /*
1383          * This is the new filesystem which we have to generate a new ID for.
1384          */
1385         fid = t->max_filesystem_id++;
1386         if (t->max_filesystem_id > t->allocated_filesystem) {
1387                 size_t s;
1388                 void *p;
1389
1390                 s = t->max_filesystem_id * 2;
1391                 p = realloc(t->filesystem_table,
1392                         s * sizeof(*t->filesystem_table));
1393                 if (p == NULL) {
1394                         archive_set_error(&a->archive, ENOMEM,
1395                             "Can't allocate tar data");
1396                         return (ARCHIVE_FATAL);
1397                 }
1398                 t->filesystem_table = (struct filesystem *)p;
1399                 t->allocated_filesystem = s;
1400         }
1401         t->current_filesystem_id = fid;
1402         t->current_filesystem = &(t->filesystem_table[fid]);
1403         t->current_filesystem->dev = dev;
1404         t->current_filesystem->allocation_ptr = NULL;
1405         t->current_filesystem->buff = NULL;
1406
1407         /* Setup the current filesystem properties which depend on
1408          * platform specific. */
1409         return (setup_current_filesystem(a));
1410 }
1411
1412 /*
1413  * Returns 1 if current filesystem is generated filesystem, 0 if it is not
1414  * or -1 if it is unknown.
1415  */
1416 int
1417 archive_read_disk_current_filesystem_is_synthetic(struct archive *_a)
1418 {
1419         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1420
1421         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
1422             "archive_read_disk_current_filesystem");
1423
1424         return (a->tree->current_filesystem->synthetic);
1425 }
1426
1427 /*
1428  * Returns 1 if current filesystem is remote filesystem, 0 if it is not
1429  * or -1 if it is unknown.
1430  */
1431 int
1432 archive_read_disk_current_filesystem_is_remote(struct archive *_a)
1433 {
1434         struct archive_read_disk *a = (struct archive_read_disk *)_a;
1435
1436         archive_check_magic(_a, ARCHIVE_READ_DISK_MAGIC, ARCHIVE_STATE_DATA,
1437             "archive_read_disk_current_filesystem");
1438
1439         return (a->tree->current_filesystem->remote);
1440 }
1441
1442 #if defined(_PC_REC_INCR_XFER_SIZE) && defined(_PC_REC_MAX_XFER_SIZE) &&\
1443         defined(_PC_REC_MIN_XFER_SIZE) && defined(_PC_REC_XFER_ALIGN)
1444 static int
1445 get_xfer_size(struct tree *t, int fd, const char *path)
1446 {
1447         t->current_filesystem->xfer_align = -1;
1448         errno = 0;
1449         if (fd >= 0) {
1450                 t->current_filesystem->incr_xfer_size =
1451                     fpathconf(fd, _PC_REC_INCR_XFER_SIZE);
1452                 t->current_filesystem->max_xfer_size =
1453                     fpathconf(fd, _PC_REC_MAX_XFER_SIZE);
1454                 t->current_filesystem->min_xfer_size =
1455                     fpathconf(fd, _PC_REC_MIN_XFER_SIZE);
1456                 t->current_filesystem->xfer_align =
1457                     fpathconf(fd, _PC_REC_XFER_ALIGN);
1458         } else if (path != NULL) {
1459                 t->current_filesystem->incr_xfer_size =
1460                     pathconf(path, _PC_REC_INCR_XFER_SIZE);
1461                 t->current_filesystem->max_xfer_size =
1462                     pathconf(path, _PC_REC_MAX_XFER_SIZE);
1463                 t->current_filesystem->min_xfer_size =
1464                     pathconf(path, _PC_REC_MIN_XFER_SIZE);
1465                 t->current_filesystem->xfer_align =
1466                     pathconf(path, _PC_REC_XFER_ALIGN);
1467         }
1468         /* At least we need an alignment size. */
1469         if (t->current_filesystem->xfer_align == -1)
1470                 return ((errno == EINVAL)?1:-1);
1471         else
1472                 return (0);
1473 }
1474 #else
1475 static int
1476 get_xfer_size(struct tree *t, int fd, const char *path)
1477 {
1478         (void)t; /* UNUSED */
1479         (void)fd; /* UNUSED */
1480         (void)path; /* UNUSED */
1481         return (1);/* Not supported */
1482 }
1483 #endif
1484
1485 #if defined(HAVE_STATFS) && defined(HAVE_FSTATFS) && defined(MNT_LOCAL) \
1486         && !defined(ST_LOCAL)
1487
1488 /*
1489  * Gather current filesystem properties on FreeBSD, OpenBSD and Mac OS X.
1490  */
1491 static int
1492 setup_current_filesystem(struct archive_read_disk *a)
1493 {
1494         struct tree *t = a->tree;
1495         struct statfs sfs;
1496 #if defined(HAVE_GETVFSBYNAME) && defined(VFCF_SYNTHETIC)
1497 /* TODO: configure should set GETVFSBYNAME_ARG_TYPE to make
1498  * this accurate; some platforms have both and we need the one that's
1499  * used by getvfsbyname()
1500  *
1501  * Then the following would become:
1502  *  #if defined(GETVFSBYNAME_ARG_TYPE)
1503  *   GETVFSBYNAME_ARG_TYPE vfc;
1504  *  #endif
1505  */
1506 #  if defined(HAVE_STRUCT_XVFSCONF)
1507         struct xvfsconf vfc;
1508 #  else
1509         struct vfsconf vfc;
1510 #  endif
1511 #endif
1512         int r, xr = 0;
1513 #if !defined(HAVE_STRUCT_STATFS_F_NAMEMAX)
1514         long nm;
1515 #endif
1516
1517         t->current_filesystem->synthetic = -1;
1518         t->current_filesystem->remote = -1;
1519         if (tree_current_is_symblic_link_target(t)) {
1520 #if defined(HAVE_OPENAT)
1521                 /*
1522                  * Get file system statistics on any directory
1523                  * where current is.
1524                  */
1525                 int fd = openat(tree_current_dir_fd(t),
1526                     tree_current_access_path(t), O_RDONLY | O_CLOEXEC);
1527                 __archive_ensure_cloexec_flag(fd);
1528                 if (fd < 0) {
1529                         archive_set_error(&a->archive, errno,
1530                             "openat failed");
1531                         return (ARCHIVE_FAILED);
1532                 }
1533                 r = fstatfs(fd, &sfs);
1534                 if (r == 0)
1535                         xr = get_xfer_size(t, fd, NULL);
1536                 close(fd);
1537 #else
1538                 if (tree_enter_working_dir(t) != 0) {
1539                         archive_set_error(&a->archive, errno, "fchdir failed");
1540                         return (ARCHIVE_FAILED);
1541                 }
1542                 r = statfs(tree_current_access_path(t), &sfs);
1543                 if (r == 0)
1544                         xr = get_xfer_size(t, -1, tree_current_access_path(t));
1545 #endif
1546         } else {
1547                 r = fstatfs(tree_current_dir_fd(t), &sfs);
1548                 if (r == 0)
1549                         xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
1550         }
1551         if (r == -1 || xr == -1) {
1552                 archive_set_error(&a->archive, errno, "statfs failed");
1553                 return (ARCHIVE_FAILED);
1554         } else if (xr == 1) {
1555                 /* pathconf(_PC_REX_*) operations are not supported. */
1556                 t->current_filesystem->xfer_align = sfs.f_bsize;
1557                 t->current_filesystem->max_xfer_size = -1;
1558                 t->current_filesystem->min_xfer_size = sfs.f_iosize;
1559                 t->current_filesystem->incr_xfer_size = sfs.f_iosize;
1560         }
1561         if (sfs.f_flags & MNT_LOCAL)
1562                 t->current_filesystem->remote = 0;
1563         else
1564                 t->current_filesystem->remote = 1;
1565
1566 #if defined(HAVE_GETVFSBYNAME) && defined(VFCF_SYNTHETIC)
1567         r = getvfsbyname(sfs.f_fstypename, &vfc);
1568         if (r == -1) {
1569                 archive_set_error(&a->archive, errno, "getvfsbyname failed");
1570                 return (ARCHIVE_FAILED);
1571         }
1572         if (vfc.vfc_flags & VFCF_SYNTHETIC)
1573                 t->current_filesystem->synthetic = 1;
1574         else
1575                 t->current_filesystem->synthetic = 0;
1576 #endif
1577
1578 #if defined(MNT_NOATIME)
1579         if (sfs.f_flags & MNT_NOATIME)
1580                 t->current_filesystem->noatime = 1;
1581         else
1582 #endif
1583                 t->current_filesystem->noatime = 0;
1584
1585 #if defined(USE_READDIR_R)
1586         /* Set maximum filename length. */
1587 #if defined(HAVE_STRUCT_STATFS_F_NAMEMAX)
1588         t->current_filesystem->name_max = sfs.f_namemax;
1589 #else
1590 # if defined(_PC_NAME_MAX)
1591         /* Mac OS X does not have f_namemax in struct statfs. */
1592         if (tree_current_is_symblic_link_target(t)) {
1593                 if (tree_enter_working_dir(t) != 0) {
1594                         archive_set_error(&a->archive, errno, "fchdir failed");
1595                         return (ARCHIVE_FAILED);
1596                 }
1597                 nm = pathconf(tree_current_access_path(t), _PC_NAME_MAX);
1598         } else
1599                 nm = fpathconf(tree_current_dir_fd(t), _PC_NAME_MAX);
1600 # else
1601         nm = -1;
1602 # endif
1603         if (nm == -1)
1604                 t->current_filesystem->name_max = NAME_MAX;
1605         else
1606                 t->current_filesystem->name_max = nm;
1607 #endif
1608 #endif /* USE_READDIR_R */
1609         return (ARCHIVE_OK);
1610 }
1611
1612 #elif (defined(HAVE_STATVFS) || defined(HAVE_FSTATVFS)) && defined(ST_LOCAL)
1613
1614 /*
1615  * Gather current filesystem properties on NetBSD
1616  */
1617 static int
1618 setup_current_filesystem(struct archive_read_disk *a)
1619 {
1620         struct tree *t = a->tree;
1621         struct statvfs sfs;
1622         int r, xr = 0;
1623
1624         t->current_filesystem->synthetic = -1;
1625         if (tree_enter_working_dir(t) != 0) {
1626                 archive_set_error(&a->archive, errno, "fchdir failed");
1627                 return (ARCHIVE_FAILED);
1628         }
1629         if (tree_current_is_symblic_link_target(t)) {
1630                 r = statvfs(tree_current_access_path(t), &sfs);
1631                 if (r == 0)
1632                         xr = get_xfer_size(t, -1, tree_current_access_path(t));
1633         } else {
1634 #ifdef HAVE_FSTATVFS
1635                 r = fstatvfs(tree_current_dir_fd(t), &sfs);
1636                 if (r == 0)
1637                         xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
1638 #else
1639                 r = statvfs(".", &sfs);
1640                 if (r == 0)
1641                         xr = get_xfer_size(t, -1, ".");
1642 #endif
1643         }
1644         if (r == -1 || xr == -1) {
1645                 t->current_filesystem->remote = -1;
1646                 archive_set_error(&a->archive, errno, "statvfs failed");
1647                 return (ARCHIVE_FAILED);
1648         } else if (xr == 1) {
1649                 /* Usually come here unless NetBSD supports _PC_REC_XFER_ALIGN
1650                  * for pathconf() function. */
1651                 t->current_filesystem->xfer_align = sfs.f_frsize;
1652                 t->current_filesystem->max_xfer_size = -1;
1653 #if defined(HAVE_STRUCT_STATVFS_F_IOSIZE)
1654                 t->current_filesystem->min_xfer_size = sfs.f_iosize;
1655                 t->current_filesystem->incr_xfer_size = sfs.f_iosize;
1656 #else
1657                 t->current_filesystem->min_xfer_size = sfs.f_bsize;
1658                 t->current_filesystem->incr_xfer_size = sfs.f_bsize;
1659 #endif
1660         }
1661         if (sfs.f_flag & ST_LOCAL)
1662                 t->current_filesystem->remote = 0;
1663         else
1664                 t->current_filesystem->remote = 1;
1665
1666 #if defined(ST_NOATIME)
1667         if (sfs.f_flag & ST_NOATIME)
1668                 t->current_filesystem->noatime = 1;
1669         else
1670 #endif
1671                 t->current_filesystem->noatime = 0;
1672
1673         /* Set maximum filename length. */
1674         t->current_filesystem->name_max = sfs.f_namemax;
1675         return (ARCHIVE_OK);
1676 }
1677
1678 #elif defined(HAVE_SYS_STATFS_H) && defined(HAVE_LINUX_MAGIC_H) &&\
1679         defined(HAVE_STATFS) && defined(HAVE_FSTATFS)
1680 /*
1681  * Note: statfs is deprecated since LSB 3.2
1682  */
1683
1684 #ifndef CIFS_SUPER_MAGIC
1685 #define CIFS_SUPER_MAGIC 0xFF534D42
1686 #endif
1687 #ifndef DEVFS_SUPER_MAGIC
1688 #define DEVFS_SUPER_MAGIC 0x1373
1689 #endif
1690
1691 /*
1692  * Gather current filesystem properties on Linux
1693  */
1694 static int
1695 setup_current_filesystem(struct archive_read_disk *a)
1696 {
1697         struct tree *t = a->tree;
1698         struct statfs sfs;
1699 #if defined(HAVE_STATVFS)
1700         struct statvfs svfs;
1701 #endif
1702         int r, vr = 0, xr = 0;
1703
1704         if (tree_current_is_symblic_link_target(t)) {
1705 #if defined(HAVE_OPENAT)
1706                 /*
1707                  * Get file system statistics on any directory
1708                  * where current is.
1709                  */
1710                 int fd = openat(tree_current_dir_fd(t),
1711                     tree_current_access_path(t), O_RDONLY | O_CLOEXEC);
1712                 __archive_ensure_cloexec_flag(fd);
1713                 if (fd < 0) {
1714                         archive_set_error(&a->archive, errno,
1715                             "openat failed");
1716                         return (ARCHIVE_FAILED);
1717                 }
1718 #if defined(HAVE_FSTATVFS)
1719                 vr = fstatvfs(fd, &svfs);/* for f_flag, mount flags */
1720 #endif
1721                 r = fstatfs(fd, &sfs);
1722                 if (r == 0)
1723                         xr = get_xfer_size(t, fd, NULL);
1724                 close(fd);
1725 #else
1726                 if (tree_enter_working_dir(t) != 0) {
1727                         archive_set_error(&a->archive, errno, "fchdir failed");
1728                         return (ARCHIVE_FAILED);
1729                 }
1730 #if defined(HAVE_STATVFS)
1731                 vr = statvfs(tree_current_access_path(t), &svfs);
1732 #endif
1733                 r = statfs(tree_current_access_path(t), &sfs);
1734                 if (r == 0)
1735                         xr = get_xfer_size(t, -1, tree_current_access_path(t));
1736 #endif
1737         } else {
1738 #ifdef HAVE_FSTATFS
1739 #if defined(HAVE_FSTATVFS)
1740                 vr = fstatvfs(tree_current_dir_fd(t), &svfs);
1741 #endif
1742                 r = fstatfs(tree_current_dir_fd(t), &sfs);
1743                 if (r == 0)
1744                         xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
1745 #else
1746                 if (tree_enter_working_dir(t) != 0) {
1747                         archive_set_error(&a->archive, errno, "fchdir failed");
1748                         return (ARCHIVE_FAILED);
1749                 }
1750 #if defined(HAVE_STATVFS)
1751                 vr = statvfs(".", &svfs);
1752 #endif
1753                 r = statfs(".", &sfs);
1754                 if (r == 0)
1755                         xr = get_xfer_size(t, -1, ".");
1756 #endif
1757         }
1758         if (r == -1 || xr == -1 || vr == -1) {
1759                 t->current_filesystem->synthetic = -1;
1760                 t->current_filesystem->remote = -1;
1761                 archive_set_error(&a->archive, errno, "statfs failed");
1762                 return (ARCHIVE_FAILED);
1763         } else if (xr == 1) {
1764                 /* pathconf(_PC_REX_*) operations are not supported. */
1765 #if defined(HAVE_STATVFS)
1766                 t->current_filesystem->xfer_align = svfs.f_frsize;
1767                 t->current_filesystem->max_xfer_size = -1;
1768                 t->current_filesystem->min_xfer_size = svfs.f_bsize;
1769                 t->current_filesystem->incr_xfer_size = svfs.f_bsize;
1770 #else
1771                 t->current_filesystem->xfer_align = sfs.f_frsize;
1772                 t->current_filesystem->max_xfer_size = -1;
1773                 t->current_filesystem->min_xfer_size = sfs.f_bsize;
1774                 t->current_filesystem->incr_xfer_size = sfs.f_bsize;
1775 #endif
1776         }
1777         switch (sfs.f_type) {
1778         case AFS_SUPER_MAGIC:
1779         case CIFS_SUPER_MAGIC:
1780         case CODA_SUPER_MAGIC:
1781         case NCP_SUPER_MAGIC:/* NetWare */
1782         case NFS_SUPER_MAGIC:
1783         case SMB_SUPER_MAGIC:
1784                 t->current_filesystem->remote = 1;
1785                 t->current_filesystem->synthetic = 0;
1786                 break;
1787         case DEVFS_SUPER_MAGIC:
1788         case PROC_SUPER_MAGIC:
1789         case USBDEVICE_SUPER_MAGIC:
1790                 t->current_filesystem->remote = 0;
1791                 t->current_filesystem->synthetic = 1;
1792                 break;
1793         default:
1794                 t->current_filesystem->remote = 0;
1795                 t->current_filesystem->synthetic = 0;
1796                 break;
1797         }
1798
1799 #if defined(ST_NOATIME)
1800 #if defined(HAVE_STATVFS)
1801         if (svfs.f_flag & ST_NOATIME)
1802 #else
1803         if (sfs.f_flag & ST_NOATIME)
1804 #endif
1805                 t->current_filesystem->noatime = 1;
1806         else
1807 #endif
1808                 t->current_filesystem->noatime = 0;
1809
1810 #if defined(USE_READDIR_R)
1811         /* Set maximum filename length. */
1812         t->current_filesystem->name_max = sfs.f_namelen;
1813 #endif
1814         return (ARCHIVE_OK);
1815 }
1816
1817 #elif defined(HAVE_SYS_STATVFS_H) &&\
1818         (defined(HAVE_STATVFS) || defined(HAVE_FSTATVFS))
1819
1820 /*
1821  * Gather current filesystem properties on other posix platform.
1822  */
1823 static int
1824 setup_current_filesystem(struct archive_read_disk *a)
1825 {
1826         struct tree *t = a->tree;
1827         struct statvfs sfs;
1828         int r, xr = 0;
1829
1830         t->current_filesystem->synthetic = -1;/* Not supported */
1831         t->current_filesystem->remote = -1;/* Not supported */
1832         if (tree_current_is_symblic_link_target(t)) {
1833 #if defined(HAVE_OPENAT)
1834                 /*
1835                  * Get file system statistics on any directory
1836                  * where current is.
1837                  */
1838                 int fd = openat(tree_current_dir_fd(t),
1839                     tree_current_access_path(t), O_RDONLY | O_CLOEXEC);
1840                 __archive_ensure_cloexec_flag(fd);
1841                 if (fd < 0) {
1842                         archive_set_error(&a->archive, errno,
1843                             "openat failed");
1844                         return (ARCHIVE_FAILED);
1845                 }
1846                 r = fstatvfs(fd, &sfs);
1847                 if (r == 0)
1848                         xr = get_xfer_size(t, fd, NULL);
1849                 close(fd);
1850 #else
1851                 if (tree_enter_working_dir(t) != 0) {
1852                         archive_set_error(&a->archive, errno, "fchdir failed");
1853                         return (ARCHIVE_FAILED);
1854                 }
1855                 r = statvfs(tree_current_access_path(t), &sfs);
1856                 if (r == 0)
1857                         xr = get_xfer_size(t, -1, tree_current_access_path(t));
1858 #endif
1859         } else {
1860 #ifdef HAVE_FSTATVFS
1861                 r = fstatvfs(tree_current_dir_fd(t), &sfs);
1862                 if (r == 0)
1863                         xr = get_xfer_size(t, tree_current_dir_fd(t), NULL);
1864 #else
1865                 if (tree_enter_working_dir(t) != 0) {
1866                         archive_set_error(&a->archive, errno, "fchdir failed");
1867                         return (ARCHIVE_FAILED);
1868                 }
1869                 r = statvfs(".", &sfs);
1870                 if (r == 0)
1871                         xr = get_xfer_size(t, -1, ".");
1872 #endif
1873         }
1874         if (r == -1 || xr == -1) {
1875                 t->current_filesystem->synthetic = -1;
1876                 t->current_filesystem->remote = -1;
1877                 archive_set_error(&a->archive, errno, "statvfs failed");
1878                 return (ARCHIVE_FAILED);
1879         } else if (xr == 1) {
1880                 /* pathconf(_PC_REX_*) operations are not supported. */
1881                 t->current_filesystem->xfer_align = sfs.f_frsize;
1882                 t->current_filesystem->max_xfer_size = -1;
1883                 t->current_filesystem->min_xfer_size = sfs.f_bsize;
1884                 t->current_filesystem->incr_xfer_size = sfs.f_bsize;
1885         }
1886
1887 #if defined(ST_NOATIME)
1888         if (sfs.f_flag & ST_NOATIME)
1889                 t->current_filesystem->noatime = 1;
1890         else
1891 #endif
1892                 t->current_filesystem->noatime = 0;
1893
1894 #if defined(USE_READDIR_R)
1895         /* Set maximum filename length. */
1896         t->current_filesystem->name_max = sfs.f_namemax;
1897 #endif
1898         return (ARCHIVE_OK);
1899 }
1900
1901 #else
1902
1903 /*
1904  * Generic: Gather current filesystem properties.
1905  * TODO: Is this generic function really needed?
1906  */
1907 static int
1908 setup_current_filesystem(struct archive_read_disk *a)
1909 {
1910         struct tree *t = a->tree;
1911 #if defined(_PC_NAME_MAX) && defined(USE_READDIR_R)
1912         long nm;
1913 #endif
1914         t->current_filesystem->synthetic = -1;/* Not supported */
1915         t->current_filesystem->remote = -1;/* Not supported */
1916         t->current_filesystem->noatime = 0;
1917         (void)get_xfer_size(t, -1, ".");/* Dummy call to avoid build error. */
1918         t->current_filesystem->xfer_align = -1;/* Unknown */
1919         t->current_filesystem->max_xfer_size = -1;
1920         t->current_filesystem->min_xfer_size = -1;
1921         t->current_filesystem->incr_xfer_size = -1;
1922
1923 #if defined(USE_READDIR_R)
1924         /* Set maximum filename length. */
1925 #  if defined(_PC_NAME_MAX)
1926         if (tree_current_is_symblic_link_target(t)) {
1927                 if (tree_enter_working_dir(t) != 0) {
1928                         archive_set_error(&a->archive, errno, "fchdir failed");
1929                         return (ARCHIVE_FAILED);
1930                 }
1931                 nm = pathconf(tree_current_access_path(t), _PC_NAME_MAX);
1932         } else
1933                 nm = fpathconf(tree_current_dir_fd(t), _PC_NAME_MAX);
1934         if (nm == -1)
1935 #  endif /* _PC_NAME_MAX */
1936                 /*
1937                  * Some systems (HP-UX or others?) incorrectly defined
1938                  * NAME_MAX macro to be a smaller value.
1939                  */
1940 #  if defined(NAME_MAX) && NAME_MAX >= 255
1941                 t->current_filesystem->name_max = NAME_MAX;
1942 #  else
1943                 /* No way to get a trusted value of maximum filename
1944                  * length. */
1945                 t->current_filesystem->name_max = PATH_MAX;
1946 #  endif /* NAME_MAX */
1947 #  if defined(_PC_NAME_MAX)
1948         else
1949                 t->current_filesystem->name_max = nm;
1950 #  endif /* _PC_NAME_MAX */
1951 #endif /* USE_READDIR_R */
1952         return (ARCHIVE_OK);
1953 }
1954
1955 #endif
1956
1957 static int
1958 close_and_restore_time(int fd, struct tree *t, struct restore_time *rt)
1959 {
1960 #ifndef HAVE_UTIMES
1961         (void)t; /* UNUSED */
1962         (void)rt; /* UNUSED */
1963         return (close(fd));
1964 #else
1965 #if defined(HAVE_FUTIMENS) && !defined(__CYGWIN__)
1966         struct timespec timespecs[2];
1967 #endif
1968         struct timeval times[2];
1969
1970         if ((t->flags & needsRestoreTimes) == 0 || rt->noatime) {
1971                 if (fd >= 0)
1972                         return (close(fd));
1973                 else
1974                         return (0);
1975         }
1976
1977 #if defined(HAVE_FUTIMENS) && !defined(__CYGWIN__)
1978         if (rt->mtime == (time_t)-1) {
1979                 timespecs[1].tv_sec = 0;
1980                 timespecs[1].tv_nsec = UTIME_OMIT;
1981         } else {
1982                 timespecs[1].tv_sec = rt->mtime;
1983                 timespecs[1].tv_nsec = rt->mtime_nsec;
1984         }
1985
1986         if (rt->atime == (time_t)-1) {
1987                 timespecs[0].tv_sec = 0;
1988                 timespecs[0].tv_nsec = UTIME_OMIT;
1989         } else {
1990                 timespecs[0].tv_sec = rt->atime;
1991                 timespecs[0].tv_nsec = rt->atime_nsec;
1992         }
1993         /* futimens() is defined in POSIX.1-2008. */
1994         if (futimens(fd, timespecs) == 0)
1995                 return (close(fd));
1996 #endif
1997
1998         times[1].tv_sec = rt->mtime;
1999         times[1].tv_usec = rt->mtime_nsec / 1000;
2000
2001         times[0].tv_sec = rt->atime;
2002         times[0].tv_usec = rt->atime_nsec / 1000;
2003
2004 #if !defined(HAVE_FUTIMENS) && defined(HAVE_FUTIMES) && !defined(__CYGWIN__)
2005         if (futimes(fd, times) == 0)
2006                 return (close(fd));
2007 #endif
2008         close(fd);
2009 #if defined(HAVE_FUTIMESAT)
2010         if (futimesat(tree_current_dir_fd(t), rt->name, times) == 0)
2011                 return (0);
2012 #endif
2013 #ifdef HAVE_LUTIMES
2014         if (lutimes(rt->name, times) != 0)
2015 #else
2016         if (AE_IFLNK != rt->filetype && utimes(rt->name, times) != 0)
2017 #endif
2018                 return (-1);
2019 #endif
2020         return (0);
2021 }
2022
2023 static int
2024 open_on_current_dir(struct tree *t, const char *path, int flags)
2025 {
2026 #ifdef HAVE_OPENAT
2027         return (openat(tree_current_dir_fd(t), path, flags));
2028 #else
2029         if (tree_enter_working_dir(t) != 0)
2030                 return (-1);
2031         return (open(path, flags));
2032 #endif
2033 }
2034
2035 static int
2036 tree_dup(int fd)
2037 {
2038         int new_fd;
2039 #ifdef F_DUPFD_CLOEXEC
2040         static volatile int can_dupfd_cloexec = 1;
2041
2042         if (can_dupfd_cloexec) {
2043                 new_fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
2044                 if (new_fd != -1)
2045                         return (new_fd);
2046                 /* Linux 2.6.18 - 2.6.23 declare F_DUPFD_CLOEXEC,
2047                  * but it cannot be used. So we have to try dup(). */
2048                 /* We won't try F_DUPFD_CLOEXEC. */
2049                 can_dupfd_cloexec = 0;
2050         }
2051 #endif /* F_DUPFD_CLOEXEC */
2052         new_fd = dup(fd);
2053         __archive_ensure_cloexec_flag(new_fd);
2054         return (new_fd);
2055 }
2056
2057 /*
2058  * Add a directory path to the current stack.
2059  */
2060 static void
2061 tree_push(struct tree *t, const char *path, int filesystem_id,
2062     int64_t dev, int64_t ino, struct restore_time *rt)
2063 {
2064         struct tree_entry *te;
2065
2066         te = calloc(1, sizeof(*te));
2067         te->next = t->stack;
2068         te->parent = t->current;
2069         if (te->parent)
2070                 te->depth = te->parent->depth + 1;
2071         t->stack = te;
2072         archive_string_init(&te->name);
2073         te->symlink_parent_fd = -1;
2074         archive_strcpy(&te->name, path);
2075         te->flags = needsDescent | needsOpen | needsAscent;
2076         te->filesystem_id = filesystem_id;
2077         te->dev = dev;
2078         te->ino = ino;
2079         te->dirname_length = t->dirname_length;
2080         te->restore_time.name = te->name.s;
2081         if (rt != NULL) {
2082                 te->restore_time.mtime = rt->mtime;
2083                 te->restore_time.mtime_nsec = rt->mtime_nsec;
2084                 te->restore_time.atime = rt->atime;
2085                 te->restore_time.atime_nsec = rt->atime_nsec;
2086                 te->restore_time.filetype = rt->filetype;
2087                 te->restore_time.noatime = rt->noatime;
2088         }
2089 }
2090
2091 /*
2092  * Append a name to the current dir path.
2093  */
2094 static void
2095 tree_append(struct tree *t, const char *name, size_t name_length)
2096 {
2097         size_t size_needed;
2098
2099         t->path.s[t->dirname_length] = '\0';
2100         t->path.length = t->dirname_length;
2101         /* Strip trailing '/' from name, unless entire name is "/". */
2102         while (name_length > 1 && name[name_length - 1] == '/')
2103                 name_length--;
2104
2105         /* Resize pathname buffer as needed. */
2106         size_needed = name_length + t->dirname_length + 2;
2107         archive_string_ensure(&t->path, size_needed);
2108         /* Add a separating '/' if it's needed. */
2109         if (t->dirname_length > 0 && t->path.s[archive_strlen(&t->path)-1] != '/')
2110                 archive_strappend_char(&t->path, '/');
2111         t->basename = t->path.s + archive_strlen(&t->path);
2112         archive_strncat(&t->path, name, name_length);
2113         t->restore_time.name = t->basename;
2114 }
2115
2116 /*
2117  * Open a directory tree for traversal.
2118  */
2119 static struct tree *
2120 tree_open(const char *path, int symlink_mode, int restore_time)
2121 {
2122         struct tree *t;
2123
2124         if ((t = calloc(1, sizeof(*t))) == NULL)
2125                 return (NULL);
2126         archive_string_init(&t->path);
2127         archive_string_ensure(&t->path, 31);
2128         t->initial_symlink_mode = symlink_mode;
2129         return (tree_reopen(t, path, restore_time));
2130 }
2131
2132 static struct tree *
2133 tree_reopen(struct tree *t, const char *path, int restore_time)
2134 {
2135         t->flags = (restore_time != 0)?needsRestoreTimes:0;
2136         t->flags |= onInitialDir;
2137         t->visit_type = 0;
2138         t->tree_errno = 0;
2139         t->dirname_length = 0;
2140         t->depth = 0;
2141         t->descend = 0;
2142         t->current = NULL;
2143         t->d = INVALID_DIR_HANDLE;
2144         t->symlink_mode = t->initial_symlink_mode;
2145         archive_string_empty(&t->path);
2146         t->entry_fd = -1;
2147         t->entry_eof = 0;
2148         t->entry_remaining_bytes = 0;
2149         t->initial_filesystem_id = -1;
2150
2151         /* First item is set up a lot like a symlink traversal. */
2152         tree_push(t, path, 0, 0, 0, NULL);
2153         t->stack->flags = needsFirstVisit;
2154         t->maxOpenCount = t->openCount = 1;
2155         t->initial_dir_fd = open(".", O_RDONLY | O_CLOEXEC);
2156         __archive_ensure_cloexec_flag(t->initial_dir_fd);
2157         t->working_dir_fd = tree_dup(t->initial_dir_fd);
2158         return (t);
2159 }
2160
2161 static int
2162 tree_descent(struct tree *t)
2163 {
2164         int flag, new_fd, r = 0;
2165
2166         t->dirname_length = archive_strlen(&t->path);
2167         flag = O_RDONLY | O_CLOEXEC;
2168 #if defined(O_DIRECTORY)
2169         flag |= O_DIRECTORY;
2170 #endif
2171         new_fd = open_on_current_dir(t, t->stack->name.s, flag);
2172         __archive_ensure_cloexec_flag(new_fd);
2173         if (new_fd < 0) {
2174                 t->tree_errno = errno;
2175                 r = TREE_ERROR_DIR;
2176         } else {
2177                 t->depth++;
2178                 /* If it is a link, set up fd for the ascent. */
2179                 if (t->stack->flags & isDirLink) {
2180                         t->stack->symlink_parent_fd = t->working_dir_fd;
2181                         t->openCount++;
2182                         if (t->openCount > t->maxOpenCount)
2183                                 t->maxOpenCount = t->openCount;
2184                 } else
2185                         close(t->working_dir_fd);
2186                 /* Renew the current working directory. */
2187                 t->working_dir_fd = new_fd;
2188                 t->flags &= ~onWorkingDir;
2189         }
2190         return (r);
2191 }
2192
2193 /*
2194  * We've finished a directory; ascend back to the parent.
2195  */
2196 static int
2197 tree_ascend(struct tree *t)
2198 {
2199         struct tree_entry *te;
2200         int new_fd, r = 0, prev_dir_fd;
2201
2202         te = t->stack;
2203         prev_dir_fd = t->working_dir_fd;
2204         if (te->flags & isDirLink)
2205                 new_fd = te->symlink_parent_fd;
2206         else {
2207                 new_fd = open_on_current_dir(t, "..", O_RDONLY | O_CLOEXEC);
2208                 __archive_ensure_cloexec_flag(new_fd);
2209         }
2210         if (new_fd < 0) {
2211                 t->tree_errno = errno;
2212                 r = TREE_ERROR_FATAL;
2213         } else {
2214                 /* Renew the current working directory. */
2215                 t->working_dir_fd = new_fd;
2216                 t->flags &= ~onWorkingDir;
2217                 /* Current directory has been changed, we should
2218                  * close an fd of previous working directory. */
2219                 close_and_restore_time(prev_dir_fd, t, &te->restore_time);
2220                 if (te->flags & isDirLink) {
2221                         t->openCount--;
2222                         te->symlink_parent_fd = -1;
2223                 }
2224                 t->depth--;
2225         }
2226         return (r);
2227 }
2228
2229 /*
2230  * Return to the initial directory where tree_open() was performed.
2231  */
2232 static int
2233 tree_enter_initial_dir(struct tree *t)
2234 {
2235         int r = 0;
2236
2237         if ((t->flags & onInitialDir) == 0) {
2238                 r = fchdir(t->initial_dir_fd);
2239                 if (r == 0) {
2240                         t->flags &= ~onWorkingDir;
2241                         t->flags |= onInitialDir;
2242                 }
2243         }
2244         return (r);
2245 }
2246
2247 /*
2248  * Restore working directory of directory traversals.
2249  */
2250 static int
2251 tree_enter_working_dir(struct tree *t)
2252 {
2253         int r = 0;
2254
2255         /*
2256          * Change the current directory if really needed.
2257          * Sometimes this is unneeded when we did not do
2258          * descent.
2259          */
2260         if (t->depth > 0 && (t->flags & onWorkingDir) == 0) {
2261                 r = fchdir(t->working_dir_fd);
2262                 if (r == 0) {
2263                         t->flags &= ~onInitialDir;
2264                         t->flags |= onWorkingDir;
2265                 }
2266         }
2267         return (r);
2268 }
2269
2270 static int
2271 tree_current_dir_fd(struct tree *t)
2272 {
2273         return (t->working_dir_fd);
2274 }
2275
2276 /*
2277  * Pop the working stack.
2278  */
2279 static void
2280 tree_pop(struct tree *t)
2281 {
2282         struct tree_entry *te;
2283
2284         t->path.s[t->dirname_length] = '\0';
2285         t->path.length = t->dirname_length;
2286         if (t->stack == t->current && t->current != NULL)
2287                 t->current = t->current->parent;
2288         te = t->stack;
2289         t->stack = te->next;
2290         t->dirname_length = te->dirname_length;
2291         t->basename = t->path.s + t->dirname_length;
2292         while (t->basename[0] == '/')
2293                 t->basename++;
2294         archive_string_free(&te->name);
2295         free(te);
2296 }
2297
2298 /*
2299  * Get the next item in the tree traversal.
2300  */
2301 static int
2302 tree_next(struct tree *t)
2303 {
2304         int r;
2305
2306         while (t->stack != NULL) {
2307                 /* If there's an open dir, get the next entry from there. */
2308                 if (t->d != INVALID_DIR_HANDLE) {
2309                         r = tree_dir_next_posix(t);
2310                         if (r == 0)
2311                                 continue;
2312                         return (r);
2313                 }
2314
2315                 if (t->stack->flags & needsFirstVisit) {
2316                         /* Top stack item needs a regular visit. */
2317                         t->current = t->stack;
2318                         tree_append(t, t->stack->name.s,
2319                             archive_strlen(&(t->stack->name)));
2320                         /* t->dirname_length = t->path_length; */
2321                         /* tree_pop(t); */
2322                         t->stack->flags &= ~needsFirstVisit;
2323                         return (t->visit_type = TREE_REGULAR);
2324                 } else if (t->stack->flags & needsDescent) {
2325                         /* Top stack item is dir to descend into. */
2326                         t->current = t->stack;
2327                         tree_append(t, t->stack->name.s,
2328                             archive_strlen(&(t->stack->name)));
2329                         t->stack->flags &= ~needsDescent;
2330                         r = tree_descent(t);
2331                         if (r != 0) {
2332                                 tree_pop(t);
2333                                 t->visit_type = r;
2334                         } else
2335                                 t->visit_type = TREE_POSTDESCENT;
2336                         return (t->visit_type);
2337                 } else if (t->stack->flags & needsOpen) {
2338                         t->stack->flags &= ~needsOpen;
2339                         r = tree_dir_next_posix(t);
2340                         if (r == 0)
2341                                 continue;
2342                         return (r);
2343                 } else if (t->stack->flags & needsAscent) {
2344                         /* Top stack item is dir and we're done with it. */
2345                         r = tree_ascend(t);
2346                         tree_pop(t);
2347                         t->visit_type = r != 0 ? r : TREE_POSTASCENT;
2348                         return (t->visit_type);
2349                 } else {
2350                         /* Top item on stack is dead. */
2351                         tree_pop(t);
2352                         t->flags &= ~hasLstat;
2353                         t->flags &= ~hasStat;
2354                 }
2355         }
2356         return (t->visit_type = 0);
2357 }
2358
2359 static int
2360 tree_dir_next_posix(struct tree *t)
2361 {
2362         int r;
2363         const char *name;
2364         size_t namelen;
2365
2366         if (t->d == NULL) {
2367 #if defined(USE_READDIR_R)
2368                 size_t dirent_size;
2369 #endif
2370
2371 #if defined(HAVE_FDOPENDIR)
2372                 t->d = fdopendir(tree_dup(t->working_dir_fd));
2373 #else /* HAVE_FDOPENDIR */
2374                 if (tree_enter_working_dir(t) == 0) {
2375                         t->d = opendir(".");
2376 #if HAVE_DIRFD || defined(dirfd)
2377                         __archive_ensure_cloexec_flag(dirfd(t->d));
2378 #endif
2379                 }
2380 #endif /* HAVE_FDOPENDIR */
2381                 if (t->d == NULL) {
2382                         r = tree_ascend(t); /* Undo "chdir" */
2383                         tree_pop(t);
2384                         t->tree_errno = errno;
2385                         t->visit_type = r != 0 ? r : TREE_ERROR_DIR;
2386                         return (t->visit_type);
2387                 }
2388 #if defined(USE_READDIR_R)
2389                 dirent_size = offsetof(struct dirent, d_name) +
2390                   t->filesystem_table[t->current->filesystem_id].name_max + 1;
2391                 if (t->dirent == NULL || t->dirent_allocated < dirent_size) {
2392                         free(t->dirent);
2393                         t->dirent = malloc(dirent_size);
2394                         if (t->dirent == NULL) {
2395                                 closedir(t->d);
2396                                 t->d = INVALID_DIR_HANDLE;
2397                                 (void)tree_ascend(t);
2398                                 tree_pop(t);
2399                                 t->tree_errno = ENOMEM;
2400                                 t->visit_type = TREE_ERROR_DIR;
2401                                 return (t->visit_type);
2402                         }
2403                         t->dirent_allocated = dirent_size;
2404                 }
2405 #endif /* USE_READDIR_R */
2406         }
2407         for (;;) {
2408                 errno = 0;
2409 #if defined(USE_READDIR_R)
2410                 r = readdir_r(t->d, t->dirent, &t->de);
2411 #ifdef _AIX
2412                 /* Note: According to the man page, return value 9 indicates
2413                  * that the readdir_r was not successful and the error code
2414                  * is set to the global errno variable. And then if the end
2415                  * of directory entries was reached, the return value is 9
2416                  * and the third parameter is set to NULL and errno is
2417                  * unchanged. */
2418                 if (r == 9)
2419                         r = errno;
2420 #endif /* _AIX */
2421                 if (r != 0 || t->de == NULL) {
2422 #else
2423                 t->de = readdir(t->d);
2424                 if (t->de == NULL) {
2425                         r = errno;
2426 #endif
2427                         closedir(t->d);
2428                         t->d = INVALID_DIR_HANDLE;
2429                         if (r != 0) {
2430                                 t->tree_errno = r;
2431                                 t->visit_type = TREE_ERROR_DIR;
2432                                 return (t->visit_type);
2433                         } else
2434                                 return (0);
2435                 }
2436                 name = t->de->d_name;
2437                 namelen = D_NAMELEN(t->de);
2438                 t->flags &= ~hasLstat;
2439                 t->flags &= ~hasStat;
2440                 if (name[0] == '.' && name[1] == '\0')
2441                         continue;
2442                 if (name[0] == '.' && name[1] == '.' && name[2] == '\0')
2443                         continue;
2444                 tree_append(t, name, namelen);
2445                 return (t->visit_type = TREE_REGULAR);
2446         }
2447 }
2448
2449
2450 /*
2451  * Get the stat() data for the entry just returned from tree_next().
2452  */
2453 static const struct stat *
2454 tree_current_stat(struct tree *t)
2455 {
2456         if (!(t->flags & hasStat)) {
2457 #ifdef HAVE_FSTATAT
2458                 if (fstatat(tree_current_dir_fd(t),
2459                     tree_current_access_path(t), &t->st, 0) != 0)
2460 #else
2461                 if (tree_enter_working_dir(t) != 0)
2462                         return NULL;
2463                 if (stat(tree_current_access_path(t), &t->st) != 0)
2464 #endif
2465                         return NULL;
2466                 t->flags |= hasStat;
2467         }
2468         return (&t->st);
2469 }
2470
2471 /*
2472  * Get the lstat() data for the entry just returned from tree_next().
2473  */
2474 static const struct stat *
2475 tree_current_lstat(struct tree *t)
2476 {
2477         if (!(t->flags & hasLstat)) {
2478 #ifdef HAVE_FSTATAT
2479                 if (fstatat(tree_current_dir_fd(t),
2480                     tree_current_access_path(t), &t->lst,
2481                     AT_SYMLINK_NOFOLLOW) != 0)
2482 #else
2483                 if (tree_enter_working_dir(t) != 0)
2484                         return NULL;
2485                 if (lstat(tree_current_access_path(t), &t->lst) != 0)
2486 #endif
2487                         return NULL;
2488                 t->flags |= hasLstat;
2489         }
2490         return (&t->lst);
2491 }
2492
2493 /*
2494  * Test whether current entry is a dir or link to a dir.
2495  */
2496 static int
2497 tree_current_is_dir(struct tree *t)
2498 {
2499         const struct stat *st;
2500         /*
2501          * If we already have lstat() info, then try some
2502          * cheap tests to determine if this is a dir.
2503          */
2504         if (t->flags & hasLstat) {
2505                 /* If lstat() says it's a dir, it must be a dir. */
2506                 st = tree_current_lstat(t);
2507                 if (st == NULL)
2508                         return 0;
2509                 if (S_ISDIR(st->st_mode))
2510                         return 1;
2511                 /* Not a dir; might be a link to a dir. */
2512                 /* If it's not a link, then it's not a link to a dir. */
2513                 if (!S_ISLNK(st->st_mode))
2514                         return 0;
2515                 /*
2516                  * It's a link, but we don't know what it's a link to,
2517                  * so we'll have to use stat().
2518                  */
2519         }
2520
2521         st = tree_current_stat(t);
2522         /* If we can't stat it, it's not a dir. */
2523         if (st == NULL)
2524                 return 0;
2525         /* Use the definitive test.  Hopefully this is cached. */
2526         return (S_ISDIR(st->st_mode));
2527 }
2528
2529 /*
2530  * Test whether current entry is a physical directory.  Usually, we
2531  * already have at least one of stat() or lstat() in memory, so we
2532  * use tricks to try to avoid an extra trip to the disk.
2533  */
2534 static int
2535 tree_current_is_physical_dir(struct tree *t)
2536 {
2537         const struct stat *st;
2538
2539         /*
2540          * If stat() says it isn't a dir, then it's not a dir.
2541          * If stat() data is cached, this check is free, so do it first.
2542          */
2543         if (t->flags & hasStat) {
2544                 st = tree_current_stat(t);
2545                 if (st == NULL)
2546                         return (0);
2547                 if (!S_ISDIR(st->st_mode))
2548                         return (0);
2549         }
2550
2551         /*
2552          * Either stat() said it was a dir (in which case, we have
2553          * to determine whether it's really a link to a dir) or
2554          * stat() info wasn't available.  So we use lstat(), which
2555          * hopefully is already cached.
2556          */
2557
2558         st = tree_current_lstat(t);
2559         /* If we can't stat it, it's not a dir. */
2560         if (st == NULL)
2561                 return 0;
2562         /* Use the definitive test.  Hopefully this is cached. */
2563         return (S_ISDIR(st->st_mode));
2564 }
2565
2566 /*
2567  * Test whether the same file has been in the tree as its parent.
2568  */
2569 static int
2570 tree_target_is_same_as_parent(struct tree *t, const struct stat *st)
2571 {
2572         struct tree_entry *te;
2573
2574         for (te = t->current->parent; te != NULL; te = te->parent) {
2575                 if (te->dev == (int64_t)st->st_dev &&
2576                     te->ino == (int64_t)st->st_ino)
2577                         return (1);
2578         }
2579         return (0);
2580 }
2581
2582 /*
2583  * Test whether the current file is symbolic link target and
2584  * on the other filesystem.
2585  */
2586 static int
2587 tree_current_is_symblic_link_target(struct tree *t)
2588 {
2589         static const struct stat *lst, *st;
2590
2591         lst = tree_current_lstat(t);
2592         st = tree_current_stat(t);
2593         return (st != NULL && lst != NULL &&
2594             (int64_t)st->st_dev == t->current_filesystem->dev &&
2595             st->st_dev != lst->st_dev);
2596 }
2597
2598 /*
2599  * Return the access path for the entry just returned from tree_next().
2600  */
2601 static const char *
2602 tree_current_access_path(struct tree *t)
2603 {
2604         return (t->basename);
2605 }
2606
2607 /*
2608  * Return the full path for the entry just returned from tree_next().
2609  */
2610 static const char *
2611 tree_current_path(struct tree *t)
2612 {
2613         return (t->path.s);
2614 }
2615
2616 /*
2617  * Terminate the traversal.
2618  */
2619 static void
2620 tree_close(struct tree *t)
2621 {
2622
2623         if (t == NULL)
2624                 return;
2625         if (t->entry_fd >= 0) {
2626                 close_and_restore_time(t->entry_fd, t, &t->restore_time);
2627                 t->entry_fd = -1;
2628         }
2629         /* Close the handle of readdir(). */
2630         if (t->d != INVALID_DIR_HANDLE) {
2631                 closedir(t->d);
2632                 t->d = INVALID_DIR_HANDLE;
2633         }
2634         /* Release anything remaining in the stack. */
2635         while (t->stack != NULL) {
2636                 if (t->stack->flags & isDirLink)
2637                         close(t->stack->symlink_parent_fd);
2638                 tree_pop(t);
2639         }
2640         if (t->working_dir_fd >= 0) {
2641                 close(t->working_dir_fd);
2642                 t->working_dir_fd = -1;
2643         }
2644         if (t->initial_dir_fd >= 0) {
2645                 close(t->initial_dir_fd);
2646                 t->initial_dir_fd = -1;
2647         }
2648 }
2649
2650 /*
2651  * Release any resources.
2652  */
2653 static void
2654 tree_free(struct tree *t)
2655 {
2656         int i;
2657
2658         if (t == NULL)
2659                 return;
2660         archive_string_free(&t->path);
2661 #if defined(USE_READDIR_R)
2662         free(t->dirent);
2663 #endif
2664         free(t->sparse_list);
2665         for (i = 0; i < t->max_filesystem_id; i++)
2666                 free(t->filesystem_table[i].allocation_ptr);
2667         free(t->filesystem_table);
2668         free(t);
2669 }
2670
2671 #endif