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1d152f5eb6af0b65bb83d09e917a19c96d5dc81a
[project/opkg-lede.git] / libbb / unarchive.c
1 /*
2 * Copyright (C) 2000 by Glenn McGrath
3 * Copyright (C) 2001 by Laurence Anderson
4 *
5 * Based on previous work by busybox developers and others.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22 #include <stdio.h>
23 #include <errno.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <utime.h>
28 #include <libgen.h>
29
30 #include "libbb.h"
31
32 #define CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY 1
33 #define CONFIG_FEATURE_TAR_GNU_EXTENSIONS
34
35 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
36 static char *longname = NULL;
37 static char *linkname = NULL;
38 #endif
39
40 off_t archive_offset;
41
42 #define SEEK_BUF 4096
43 static ssize_t
44 seek_by_read(FILE* fd, size_t len)
45 {
46 ssize_t cc, total = 0;
47 char buf[SEEK_BUF];
48
49 while (len) {
50 cc = fread(buf, sizeof(buf[0]),
51 len > SEEK_BUF ? SEEK_BUF : len,
52 fd);
53
54 total += cc;
55 len -= cc;
56
57 if(feof(fd) || ferror(fd))
58 break;
59 }
60 return total;
61 }
62
63 static void
64 seek_sub_file(FILE *fd, const int count)
65 {
66 archive_offset += count;
67
68 /* Do not use fseek() on a pipe. It may fail with ESPIPE, leaving the
69 * stream at an undefined location.
70 */
71 seek_by_read(fd, count);
72
73 return;
74 }
75
76
77 /* Extract the data postioned at src_stream to either filesystem, stdout or
78 * buffer depending on the value of 'function' which is defined in libbb.h
79 *
80 * prefix doesnt have to be just a directory, it may prefix the filename as well.
81 *
82 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
83 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
84 * 'dpkg.' as their prefix
85 *
86 * For this reason if prefix does point to a dir then it must end with a
87 * trailing '/' or else the last dir will be assumed to be the file prefix
88 */
89 static char *
90 extract_archive(FILE *src_stream, FILE *out_stream,
91 const file_header_t *file_entry, const int function,
92 const char *prefix,
93 int *err)
94 {
95 FILE *dst_stream = NULL;
96 char *full_name = NULL;
97 char *full_link_name = NULL;
98 char *buffer = NULL;
99 struct utimbuf t;
100
101 *err = 0;
102
103 /* prefix doesnt have to be a proper path it may prepend
104 * the filename as well */
105 if (prefix != NULL) {
106 /* strip leading '/' in filename to extract as prefix may not be dir */
107 /* Cant use concat_path_file here as prefix might not be a directory */
108 char *path = file_entry->name;
109 if (strncmp("./", path, 2) == 0) {
110 path += 2;
111 if (strlen(path) == 0)
112 /* Do nothing, current dir already exists. */
113 return NULL;
114 }
115 full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
116 strcpy(full_name, prefix);
117 strcat(full_name, path);
118 if ( file_entry->link_name ){
119 full_link_name = xmalloc(strlen(prefix) + strlen(file_entry->link_name) + 1);
120 strcpy(full_link_name, prefix);
121 strcat(full_link_name, file_entry->link_name);
122 }
123 } else {
124 full_name = xstrdup(file_entry->name);
125 if ( file_entry->link_name )
126 full_link_name = xstrdup(file_entry->link_name);
127 }
128
129
130 if (function & extract_to_stream) {
131 if (S_ISREG(file_entry->mode)) {
132 *err = copy_file_chunk(src_stream, out_stream, file_entry->size);
133 archive_offset += file_entry->size;
134 }
135 }
136 else if (function & extract_one_to_buffer) {
137 if (S_ISREG(file_entry->mode)) {
138 buffer = (char *) xmalloc(file_entry->size + 1);
139 fread(buffer, 1, file_entry->size, src_stream);
140 buffer[file_entry->size] = '\0';
141 archive_offset += file_entry->size;
142 goto cleanup;
143 }
144 }
145 else if (function & extract_all_to_fs) {
146 struct stat oldfile;
147 int stat_res;
148 stat_res = lstat (full_name, &oldfile);
149 if (stat_res == 0) { /* The file already exists */
150 if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
151 if (!S_ISDIR(oldfile.st_mode)) {
152 unlink(full_name); /* Directories might not be empty etc */
153 }
154 } else {
155 if ((function & extract_quiet) != extract_quiet) {
156 *err = -1;
157 error_msg("%s not created: newer or same age file exists", file_entry->name);
158 }
159 seek_sub_file(src_stream, file_entry->size);
160 goto cleanup;
161 }
162 }
163 if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
164 char *buf, *parent;
165 buf = xstrdup(full_name);
166 parent = dirname(buf);
167 if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
168 if ((function & extract_quiet) != extract_quiet) {
169 *err = -1;
170 error_msg("couldn't create leading directories");
171 }
172 }
173 free (buf);
174 }
175 switch(file_entry->mode & S_IFMT) {
176 case S_IFREG:
177 if (file_entry->link_name) { /* Found a cpio hard link */
178 if (link(full_link_name, full_name) != 0) {
179 if ((function & extract_quiet) != extract_quiet) {
180 *err = -1;
181 perror_msg("Cannot link from %s to '%s'",
182 file_entry->name, file_entry->link_name);
183 }
184 }
185 } else {
186 if ((dst_stream = wfopen(full_name, "w")) == NULL) {
187 *err = -1;
188 seek_sub_file(src_stream, file_entry->size);
189 goto cleanup;
190 }
191 archive_offset += file_entry->size;
192 *err = copy_file_chunk(src_stream, dst_stream, file_entry->size);
193 fclose(dst_stream);
194 }
195 break;
196 case S_IFDIR:
197 if (stat_res != 0) {
198 if (mkdir(full_name, file_entry->mode) < 0) {
199 if ((function & extract_quiet) != extract_quiet) {
200 *err = -1;
201 perror_msg("Cannot make dir %s", full_name);
202 }
203 }
204 }
205 break;
206 case S_IFLNK:
207 if (symlink(file_entry->link_name, full_name) < 0) {
208 if ((function & extract_quiet) != extract_quiet) {
209 *err = -1;
210 perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
211 }
212 goto cleanup;
213 }
214 break;
215 case S_IFSOCK:
216 case S_IFBLK:
217 case S_IFCHR:
218 case S_IFIFO:
219 if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
220 if ((function & extract_quiet) != extract_quiet) {
221 *err = -1;
222 perror_msg("Cannot create node %s", file_entry->name);
223 }
224 goto cleanup;
225 }
226 break;
227 default:
228 *err = -1;
229 perror_msg("Don't know how to handle %s", full_name);
230
231 }
232
233 /* Changing a symlink's properties normally changes the properties of the
234 * file pointed to, so dont try and change the date or mode, lchown does
235 * does the right thing, but isnt available in older versions of libc */
236 if (S_ISLNK(file_entry->mode)) {
237 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
238 lchown(full_name, file_entry->uid, file_entry->gid);
239 #endif
240 } else {
241 if (function & extract_preserve_date) {
242 t.actime = file_entry->mtime;
243 t.modtime = file_entry->mtime;
244 utime(full_name, &t);
245 }
246 chown(full_name, file_entry->uid, file_entry->gid);
247 chmod(full_name, file_entry->mode);
248 }
249 } else {
250 /* If we arent extracting data we have to skip it,
251 * if data size is 0 then then just do it anyway
252 * (saves testing for it) */
253 seek_sub_file(src_stream, file_entry->size);
254 }
255
256 /* extract_list and extract_verbose_list can be used in conjunction
257 * with one of the above four extraction functions, so do this seperately */
258 if (function & extract_verbose_list) {
259 fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
260 file_entry->uid, file_entry->gid,
261 (int) file_entry->size, time_string(file_entry->mtime));
262 }
263 if ((function & extract_list) || (function & extract_verbose_list)){
264 /* fputs doesnt add a trailing \n, so use fprintf */
265 fprintf(out_stream, "%s\n", file_entry->name);
266 }
267
268 cleanup:
269 free(full_name);
270 if ( full_link_name )
271 free(full_link_name);
272
273 return buffer;
274 }
275
276 static char *
277 unarchive(FILE *src_stream, FILE *out_stream,
278 file_header_t *(*get_headers)(FILE *),
279 void (*free_headers)(file_header_t *),
280 const int extract_function,
281 const char *prefix,
282 const char **extract_names,
283 int *err)
284 {
285 file_header_t *file_entry;
286 int extract_flag;
287 int i;
288 char *buffer = NULL;
289
290 *err = 0;
291
292 archive_offset = 0;
293 while ((file_entry = get_headers(src_stream)) != NULL) {
294 extract_flag = TRUE;
295
296 if (extract_names != NULL) {
297 int found_flag = FALSE;
298 char *p = file_entry->name;
299
300 if (p[0] == '.' && p[1] == '/')
301 p += 2;
302
303 for(i = 0; extract_names[i] != 0; i++) {
304 if (strcmp(extract_names[i], p) == 0) {
305 found_flag = TRUE;
306 break;
307 }
308 }
309 if (extract_function & extract_exclude_list) {
310 if (found_flag == TRUE) {
311 extract_flag = FALSE;
312 }
313 } else {
314 /* If its not found in the include list dont extract it */
315 if (found_flag == FALSE) {
316 extract_flag = FALSE;
317 }
318 }
319 }
320
321 if (extract_flag == TRUE) {
322 buffer = extract_archive(src_stream, out_stream,
323 file_entry, extract_function,
324 prefix, err);
325 *err = 0; /* XXX: ignore extraction errors */
326 if (*err) {
327 free_headers(file_entry);
328 break;
329 }
330 } else {
331 /* seek past the data entry */
332 seek_sub_file(src_stream, file_entry->size);
333 }
334 free_headers(file_entry);
335 }
336
337 return buffer;
338 }
339
340 static file_header_t *
341 get_header_ar(FILE *src_stream)
342 {
343 file_header_t *typed;
344 union {
345 char raw[60];
346 struct {
347 char name[16];
348 char date[12];
349 char uid[6];
350 char gid[6];
351 char mode[8];
352 char size[10];
353 char magic[2];
354 } formated;
355 } ar;
356 static char *ar_long_names;
357
358 if (fread(ar.raw, 1, 60, src_stream) != 60) {
359 return(NULL);
360 }
361 archive_offset += 60;
362 /* align the headers based on the header magic */
363 if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
364 /* some version of ar, have an extra '\n' after each data entry,
365 * this puts the next header out by 1 */
366 if (ar.formated.magic[1] != '`') {
367 error_msg("Invalid magic");
368 return(NULL);
369 }
370 /* read the next char out of what would be the data section,
371 * if its a '\n' then it is a valid header offset by 1*/
372 archive_offset++;
373 if (fgetc(src_stream) != '\n') {
374 error_msg("Invalid magic");
375 return(NULL);
376 }
377 /* fix up the header, we started reading 1 byte too early */
378 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
379 memmove(ar.raw, &ar.raw[1], 59);
380 }
381
382 typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
383
384 typed->size = (size_t) atoi(ar.formated.size);
385 /* long filenames have '/' as the first character */
386 if (ar.formated.name[0] == '/') {
387 if (ar.formated.name[1] == '/') {
388 /* If the second char is a '/' then this entries data section
389 * stores long filename for multiple entries, they are stored
390 * in static variable long_names for use in future entries */
391 ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
392 fread(ar_long_names, 1, typed->size, src_stream);
393 archive_offset += typed->size;
394 /* This ar entries data section only contained filenames for other records
395 * they are stored in the static ar_long_names for future reference */
396 return (get_header_ar(src_stream)); /* Return next header */
397 } else if (ar.formated.name[1] == ' ') {
398 /* This is the index of symbols in the file for compilers */
399 seek_sub_file(src_stream, typed->size);
400 return (get_header_ar(src_stream)); /* Return next header */
401 } else {
402 /* The number after the '/' indicates the offset in the ar data section
403 (saved in variable long_name) that conatains the real filename */
404 if (!ar_long_names) {
405 error_msg("Cannot resolve long file name");
406 return (NULL);
407 }
408 typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
409 }
410 } else {
411 /* short filenames */
412 typed->name = xcalloc(1, 16);
413 strncpy(typed->name, ar.formated.name, 16);
414 }
415 typed->name[strcspn(typed->name, " /")]='\0';
416
417 /* convert the rest of the now valid char header to its typed struct */
418 parse_mode(ar.formated.mode, &typed->mode);
419 typed->mtime = atoi(ar.formated.date);
420 typed->uid = atoi(ar.formated.uid);
421 typed->gid = atoi(ar.formated.gid);
422
423 return(typed);
424 }
425
426 static void
427 free_header_ar(file_header_t *ar_entry)
428 {
429 if (ar_entry == NULL)
430 return;
431
432 free(ar_entry->name);
433 if (ar_entry->link_name)
434 free(ar_entry->link_name);
435
436 free(ar_entry);
437 }
438
439
440 static file_header_t *
441 get_header_tar(FILE *tar_stream)
442 {
443 union {
444 unsigned char raw[512];
445 struct {
446 char name[100]; /* 0-99 */
447 char mode[8]; /* 100-107 */
448 char uid[8]; /* 108-115 */
449 char gid[8]; /* 116-123 */
450 char size[12]; /* 124-135 */
451 char mtime[12]; /* 136-147 */
452 char chksum[8]; /* 148-155 */
453 char typeflag; /* 156-156 */
454 char linkname[100]; /* 157-256 */
455 char magic[6]; /* 257-262 */
456 char version[2]; /* 263-264 */
457 char uname[32]; /* 265-296 */
458 char gname[32]; /* 297-328 */
459 char devmajor[8]; /* 329-336 */
460 char devminor[8]; /* 337-344 */
461 char prefix[155]; /* 345-499 */
462 char padding[12]; /* 500-512 */
463 } formated;
464 } tar;
465 file_header_t *tar_entry = NULL;
466 long i;
467 long sum = 0;
468
469 if (archive_offset % 512 != 0) {
470 seek_sub_file(tar_stream, 512 - (archive_offset % 512));
471 }
472
473 if (fread(tar.raw, 1, 512, tar_stream) != 512) {
474 /* Unfortunately its common for tar files to have all sorts of
475 * trailing garbage, fail silently */
476 // error_msg("Couldnt read header");
477 return(NULL);
478 }
479 archive_offset += 512;
480
481 /* Check header has valid magic, unfortunately some tar files
482 * have empty (0'ed) tar entries at the end, which will
483 * cause this to fail, so fail silently for now
484 */
485 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
486 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
487 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
488 #endif
489 return(NULL);
490 }
491
492 /* Do checksum on headers */
493 for (i = 0; i < 148 ; i++) {
494 sum += tar.raw[i];
495 }
496 sum += ' ' * 8;
497 for (i = 156; i < 512 ; i++) {
498 sum += tar.raw[i];
499 }
500 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
501 if ( strtol(tar.formated.chksum,NULL,8) != 0 )
502 error_msg("Invalid tar header checksum");
503 return(NULL);
504 }
505
506 /* convert to type'ed variables */
507 tar_entry = xcalloc(1, sizeof(file_header_t));
508
509 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
510 if (longname) {
511 tar_entry->name = longname;
512 longname = NULL;
513 } else
514 #endif
515 {
516 tar_entry->name = xstrndup(tar.formated.name, 100);
517
518 if (tar.formated.prefix[0]) {
519 char *temp = tar_entry->name;
520 char *prefixTemp = xstrndup(tar.formated.prefix, 155);
521 tar_entry->name = concat_path_file(prefixTemp, temp);
522 free(temp);
523 free(prefixTemp);
524 }
525 }
526
527 // tar_entry->name = xstrdup(tar.formated.name);
528
529 /*
530 parse_mode(tar.formated.mode, &tar_entry->mode);
531 */
532 tar_entry->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
533
534 tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
535 tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
536 tar_entry->size = strtol(tar.formated.size, NULL, 8);
537 tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
538 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
539 if (linkname) {
540 tar_entry->link_name = linkname;
541 linkname = NULL;
542 } else
543 #endif
544 {
545 tar_entry->link_name = *tar.formated.linkname != '\0' ?
546 xstrndup(tar.formated.linkname, 100) : NULL;
547 }
548 tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
549 strtol(tar.formated.devminor, NULL, 8);
550
551 /* Fix mode, used by the old format */
552 switch (tar.formated.typeflag) {
553 /* hard links are detected as regular files with 0 size and a link name */
554 case '1':
555 tar_entry->mode |= S_IFREG ;
556 break;
557 case 0:
558 case '0':
559
560 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
561 if (last_char_is(tar_entry->name, '/')) {
562 tar_entry->mode |= S_IFDIR;
563 } else
564 # endif
565 tar_entry->mode |= S_IFREG;
566 break;
567 case '2':
568 tar_entry->mode |= S_IFLNK;
569 break;
570 case '3':
571 tar_entry->mode |= S_IFCHR;
572 break;
573 case '4':
574 tar_entry->mode |= S_IFBLK;
575 break;
576 case '5':
577 tar_entry->mode |= S_IFDIR;
578 break;
579 case '6':
580 tar_entry->mode |= S_IFIFO;
581 break;
582 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
583 case 'L': {
584 longname = xmalloc(tar_entry->size + 1);
585 if(fread(longname, tar_entry->size, 1, tar_stream) != 1)
586 return NULL;
587 longname[tar_entry->size] = '\0';
588 archive_offset += tar_entry->size;
589
590 return(get_header_tar(tar_stream));
591 }
592 case 'K': {
593 linkname = xmalloc(tar_entry->size + 1);
594 if(fread(linkname, tar_entry->size, 1, tar_stream) != 1)
595 return NULL;
596 linkname[tar_entry->size] = '\0';
597 archive_offset += tar_entry->size;
598
599 return(get_header_tar(tar_stream));
600 }
601 case 'D':
602 case 'M':
603 case 'N':
604 case 'S':
605 case 'V':
606 perror_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
607 # endif
608 default:
609 perror_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
610 break;
611
612 }
613
614 return(tar_entry);
615 }
616
617 static void
618 free_header_tar(file_header_t *tar_entry)
619 {
620 if (tar_entry == NULL)
621 return;
622
623 free(tar_entry->name);
624 if (tar_entry->link_name)
625 free(tar_entry->link_name);
626
627 free(tar_entry);
628 }
629
630 char *
631 deb_extract(const char *package_filename, FILE *out_stream,
632 const int extract_function, const char *prefix,
633 const char *filename, int *err)
634 {
635 FILE *deb_stream = NULL;
636 file_header_t *ar_header = NULL;
637 const char **file_list = NULL;
638 char *output_buffer = NULL;
639 char *ared_file = NULL;
640 char ar_magic[8];
641 int gz_err;
642
643 *err = 0;
644
645 if (filename != NULL) {
646 file_list = xmalloc(sizeof(char *) * 2);
647 file_list[0] = filename;
648 file_list[1] = NULL;
649 }
650
651 if (extract_function & extract_control_tar_gz) {
652 ared_file = "control.tar.gz";
653 }
654 else if (extract_function & extract_data_tar_gz) {
655 ared_file = "data.tar.gz";
656 } else {
657 opkg_msg(ERROR, "Internal error: extract_function=%x\n",
658 extract_function);
659 *err = -1;
660 goto cleanup;
661 }
662
663 /* open the debian package to be worked on */
664 deb_stream = wfopen(package_filename, "r");
665 if (deb_stream == NULL) {
666 *err = -1;
667 goto cleanup;
668 }
669 /* set the buffer size */
670 setvbuf(deb_stream, NULL, _IOFBF, 0x8000);
671
672 /* check ar magic */
673 fread(ar_magic, 1, 8, deb_stream);
674
675 if (strncmp(ar_magic,"!<arch>",7) == 0) {
676 archive_offset = 8;
677
678 while ((ar_header = get_header_ar(deb_stream)) != NULL) {
679 if (strcmp(ared_file, ar_header->name) == 0) {
680 int gunzip_pid = 0;
681 FILE *uncompressed_stream;
682 /* open a stream of decompressed data */
683 uncompressed_stream = gz_open(deb_stream, &gunzip_pid);
684 if (uncompressed_stream == NULL) {
685 *err = -1;
686 goto cleanup;
687 }
688
689 archive_offset = 0;
690 output_buffer = unarchive(uncompressed_stream,
691 out_stream, get_header_tar,
692 free_header_tar,
693 extract_function, prefix,
694 file_list, err);
695 fclose(uncompressed_stream);
696 gz_err = gz_close(gunzip_pid);
697 if (gz_err)
698 *err = -1;
699 free_header_ar(ar_header);
700 break;
701 }
702 if (fseek(deb_stream, ar_header->size, SEEK_CUR) == -1) {
703 opkg_perror(ERROR, "Couldn't fseek into %s", package_filename);
704 *err = -1;
705 free_header_ar(ar_header);
706 goto cleanup;
707 }
708 free_header_ar(ar_header);
709 }
710 goto cleanup;
711 } else if (strncmp(ar_magic, "\037\213", 2) == 0) {
712 /* it's a gz file, let's assume it's an opkg */
713 int unzipped_opkg_pid;
714 FILE *unzipped_opkg_stream;
715 file_header_t *tar_header;
716 archive_offset = 0;
717 if (fseek(deb_stream, 0, SEEK_SET) == -1) {
718 opkg_perror(ERROR, "Couldn't fseek into %s", package_filename);
719 *err = -1;
720 goto cleanup;
721 }
722 unzipped_opkg_stream = gz_open(deb_stream, &unzipped_opkg_pid);
723 if (unzipped_opkg_stream == NULL) {
724 *err = -1;
725 goto cleanup;
726 }
727
728 /* walk through outer tar file to find ared_file */
729 while ((tar_header = get_header_tar(unzipped_opkg_stream)) != NULL) {
730 int name_offset = 0;
731 if (strncmp(tar_header->name, "./", 2) == 0)
732 name_offset = 2;
733 if (strcmp(ared_file, tar_header->name+name_offset) == 0) {
734 int gunzip_pid = 0;
735 FILE *uncompressed_stream;
736 /* open a stream of decompressed data */
737 uncompressed_stream = gz_open(unzipped_opkg_stream, &gunzip_pid);
738 if (uncompressed_stream == NULL) {
739 *err = -1;
740 goto cleanup;
741 }
742 archive_offset = 0;
743
744 output_buffer = unarchive(uncompressed_stream,
745 out_stream,
746 get_header_tar,
747 free_header_tar,
748 extract_function,
749 prefix,
750 file_list,
751 err);
752
753 free_header_tar(tar_header);
754 fclose(uncompressed_stream);
755 gz_err = gz_close(gunzip_pid);
756 if (gz_err)
757 *err = -1;
758 break;
759 }
760 seek_sub_file(unzipped_opkg_stream, tar_header->size);
761 free_header_tar(tar_header);
762 }
763 fclose(unzipped_opkg_stream);
764 gz_err = gz_close(unzipped_opkg_pid);
765 if (gz_err)
766 *err = -1;
767
768 goto cleanup;
769 } else {
770 *err = -1;
771 error_msg("%s: invalid magic", package_filename);
772 }
773
774 cleanup:
775 if (deb_stream)
776 fclose(deb_stream);
777 if (file_list)
778 free(file_list);
779
780 return output_buffer;
781 }
LEDE fork of Opkg