2 * Copyright (C) 2000 by Glenn McGrath
3 * Copyright (C) 2001 by Laurence Anderson
5 * Based on previous work by busybox developers and others.
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.
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.
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.
30 #define CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY 1
31 #define CONFIG_FEATURE_TAR_GNU_EXTENSIONS
33 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
34 static char *longname
= NULL
;
35 static char *linkname
= NULL
;
38 extern void seek_sub_file(FILE *src_stream
, const int count
);
39 extern char *extract_archive(FILE *src_stream
, FILE *out_stream
, const file_header_t
*file_entry
,
40 const int function
, const char *prefix
);
43 #ifdef L_archive_offset
46 extern off_t archive_offset
;
49 #ifdef L_seek_sub_file
50 void seek_sub_file(FILE *src_stream
, const int count
)
53 /* Try to fseek as faster */
54 archive_offset
+= count
;
55 if (fseek(src_stream
, count
, SEEK_CUR
) != 0 && errno
== ESPIPE
) {
56 for (i
= 0; i
< count
; i
++) {
66 #ifdef L_extract_archive
67 /* Extract the data postioned at src_stream to either filesystem, stdout or
68 * buffer depending on the value of 'function' which is defined in libbb.h
70 * prefix doesnt have to be just a directory, it may prefix the filename as well.
72 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
73 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
74 * 'dpkg.' as their prefix
76 * For this reason if prefix does point to a dir then it must end with a
77 * trailing '/' or else the last dir will be assumed to be the file prefix
79 char *extract_archive(FILE *src_stream
, FILE *out_stream
, const file_header_t
*file_entry
,
80 const int function
, const char *prefix
)
82 FILE *dst_stream
= NULL
;
83 char *full_name
= NULL
;
84 char *full_link_name
= NULL
;
89 /* prefix doesnt have to be a proper path it may prepend
90 * the filename as well */
92 /* strip leading '/' in filename to extract as prefix may not be dir */
93 /* Cant use concat_path_file here as prefix might not be a directory */
94 char *path
= file_entry
->name
;
95 if (strncmp("./", path
, 2) == 0) {
97 if (strlen(path
) == 0) {
101 full_name
= xmalloc(strlen(prefix
) + strlen(path
) + 1);
102 strcpy(full_name
, prefix
);
103 strcat(full_name
, path
);
104 if ( file_entry
->link_name
){
105 full_link_name
= xmalloc(strlen(prefix
) + strlen(file_entry
->link_name
) + 1);
106 strcpy(full_link_name
, prefix
);
107 strcat(full_link_name
, file_entry
->link_name
);
110 full_name
= strdup(file_entry
->name
);
111 if ( file_entry
->link_name
)
112 full_link_name
= strdup(file_entry
->link_name
);
116 if (function
& extract_to_stdout
) {
117 if (S_ISREG(file_entry
->mode
)) {
118 copy_file_chunk(src_stream
, out_stream
, file_entry
->size
);
119 archive_offset
+= file_entry
->size
;
122 else if (function
& extract_one_to_buffer
) {
123 if (S_ISREG(file_entry
->mode
)) {
124 buffer
= (char *) xmalloc(file_entry
->size
+ 1);
125 fread(buffer
, 1, file_entry
->size
, src_stream
);
126 buffer
[file_entry
->size
] = '\0';
127 archive_offset
+= file_entry
->size
;
131 else if (function
& extract_all_to_fs
) {
134 stat_res
= lstat (full_name
, &oldfile
);
135 if (stat_res
== 0) { /* The file already exists */
136 if ((function
& extract_unconditional
) || (oldfile
.st_mtime
< file_entry
->mtime
)) {
137 if (!S_ISDIR(oldfile
.st_mode
)) {
138 unlink(full_name
); /* Directories might not be empty etc */
141 if ((function
& extract_quiet
) != extract_quiet
) {
142 error_msg("%s not created: newer or same age file exists", file_entry
->name
);
144 seek_sub_file(src_stream
, file_entry
->size
);
148 if (function
& extract_create_leading_dirs
) { /* Create leading directories with default umask */
150 buf
= xstrdup(full_name
);
151 parent
= dirname(buf
);
152 if (make_directory (parent
, -1, FILEUTILS_RECUR
) != 0) {
153 if ((function
& extract_quiet
) != extract_quiet
) {
154 error_msg("couldn't create leading directories");
159 switch(file_entry
->mode
& S_IFMT
) {
161 if (file_entry
->link_name
) { /* Found a cpio hard link */
162 if (link(full_link_name
, full_name
) != 0) {
163 if ((function
& extract_quiet
) != extract_quiet
) {
164 perror_msg("Cannot link from %s to '%s'",
165 file_entry
->name
, file_entry
->link_name
);
169 if ((dst_stream
= wfopen(full_name
, "w")) == NULL
) {
170 seek_sub_file(src_stream
, file_entry
->size
);
173 archive_offset
+= file_entry
->size
;
174 copy_file_chunk(src_stream
, dst_stream
, file_entry
->size
);
180 if (mkdir(full_name
, file_entry
->mode
) < 0) {
181 if ((function
& extract_quiet
) != extract_quiet
) {
182 perror_msg("extract_archive: %s", full_name
);
188 if (symlink(file_entry
->link_name
, full_name
) < 0) {
189 if ((function
& extract_quiet
) != extract_quiet
) {
190 perror_msg("Cannot create symlink from %s to '%s'", file_entry
->name
, file_entry
->link_name
);
199 if (mknod(full_name
, file_entry
->mode
, file_entry
->device
) == -1) {
200 if ((function
& extract_quiet
) != extract_quiet
) {
201 perror_msg("Cannot create node %s", file_entry
->name
);
207 perror_msg("Don't know how to handle %s", full_name
);
211 /* Changing a symlink's properties normally changes the properties of the
212 * file pointed to, so dont try and change the date or mode, lchown does
213 * does the right thing, but isnt available in older versions of libc */
214 if (S_ISLNK(file_entry
->mode
)) {
215 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
216 lchown(full_name
, file_entry
->uid
, file_entry
->gid
);
219 if (function
& extract_preserve_date
) {
220 t
.actime
= file_entry
->mtime
;
221 t
.modtime
= file_entry
->mtime
;
222 utime(full_name
, &t
);
224 chown(full_name
, file_entry
->uid
, file_entry
->gid
);
225 chmod(full_name
, file_entry
->mode
);
228 /* If we arent extracting data we have to skip it,
229 * if data size is 0 then then just do it anyway
230 * (saves testing for it) */
231 seek_sub_file(src_stream
, file_entry
->size
);
234 /* extract_list and extract_verbose_list can be used in conjunction
235 * with one of the above four extraction functions, so do this seperately */
236 if (function
& extract_verbose_list
) {
237 fprintf(out_stream
, "%s %d/%d %8d %s ", mode_string(file_entry
->mode
),
238 file_entry
->uid
, file_entry
->gid
,
239 (int) file_entry
->size
, time_string(file_entry
->mtime
));
241 if ((function
& extract_list
) || (function
& extract_verbose_list
)){
242 /* fputs doesnt add a trailing \n, so use fprintf */
243 fprintf(out_stream
, "%s\n", file_entry
->name
);
247 if ( full_link_name
)
248 free(full_link_name
);
250 return(NULL
); /* Maybe we should say if failed */
255 char *unarchive(FILE *src_stream
, FILE *out_stream
,
256 file_header_t
*(*get_headers
)(FILE *),
257 void (*free_headers
)(file_header_t
*),
258 const int extract_function
, const char *prefix
, char **extract_names
)
260 file_header_t
*file_entry
;
266 while ((file_entry
= get_headers(src_stream
)) != NULL
) {
268 /* fprintf(stderr, __FUNCTION__ " getting headers\n"); */
269 if (extract_names
!= NULL
) {
270 int found_flag
= FALSE
;
271 for(i
= 0; extract_names
[i
] != 0; i
++) {
272 if (strcmp(extract_names
[i
], file_entry
->name
) == 0) {
277 if (extract_function
& extract_exclude_list
) {
278 if (found_flag
== TRUE
) {
279 extract_flag
= FALSE
;
282 /* If its not found in the include list dont extract it */
283 if (found_flag
== FALSE
) {
284 extract_flag
= FALSE
;
290 if (extract_flag
== TRUE
) {
291 /* fprintf(stderr, __FUNCTION__ " extract?\n"); */
292 buffer
= extract_archive(src_stream
, out_stream
, file_entry
, extract_function
, prefix
);
293 /* fprintf(stderr, __FUNCTION__ " extracted\n"); */
295 /* seek past the data entry */
296 seek_sub_file(src_stream
, file_entry
->size
);
298 free_headers(file_entry
);
300 /*fprintf(stderr, __FUNCTION__ " goin home\n");*/
306 #ifdef L_get_header_ar
307 file_header_t
*get_header_ar(FILE *src_stream
)
309 file_header_t
*typed
;
322 static char *ar_long_names
;
324 if (fread(ar
.raw
, 1, 60, src_stream
) != 60) {
327 archive_offset
+= 60;
328 /* align the headers based on the header magic */
329 if ((ar
.formated
.magic
[0] != '`') || (ar
.formated
.magic
[1] != '\n')) {
330 /* some version of ar, have an extra '\n' after each data entry,
331 * this puts the next header out by 1 */
332 if (ar
.formated
.magic
[1] != '`') {
333 error_msg("Invalid magic");
336 /* read the next char out of what would be the data section,
337 * if its a '\n' then it is a valid header offset by 1*/
339 if (fgetc(src_stream
) != '\n') {
340 error_msg("Invalid magic");
343 /* fix up the header, we started reading 1 byte too early */
344 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
345 memmove(ar
.raw
, &ar
.raw
[1], 59);
348 typed
= (file_header_t
*) xcalloc(1, sizeof(file_header_t
));
350 typed
->size
= (size_t) atoi(ar
.formated
.size
);
351 /* long filenames have '/' as the first character */
352 if (ar
.formated
.name
[0] == '/') {
353 if (ar
.formated
.name
[1] == '/') {
354 /* If the second char is a '/' then this entries data section
355 * stores long filename for multiple entries, they are stored
356 * in static variable long_names for use in future entries */
357 ar_long_names
= (char *) xrealloc(ar_long_names
, typed
->size
);
358 fread(ar_long_names
, 1, typed
->size
, src_stream
);
359 archive_offset
+= typed
->size
;
360 /* This ar entries data section only contained filenames for other records
361 * they are stored in the static ar_long_names for future reference */
362 return (get_header_ar(src_stream
)); /* Return next header */
363 } else if (ar
.formated
.name
[1] == ' ') {
364 /* This is the index of symbols in the file for compilers */
365 seek_sub_file(src_stream
, typed
->size
);
366 return (get_header_ar(src_stream
)); /* Return next header */
368 /* The number after the '/' indicates the offset in the ar data section
369 (saved in variable long_name) that conatains the real filename */
370 if (!ar_long_names
) {
371 error_msg("Cannot resolve long file name");
374 typed
->name
= xstrdup(ar_long_names
+ atoi(&ar
.formated
.name
[1]));
377 /* short filenames */
378 typed
->name
= xcalloc(1, 16);
379 strncpy(typed
->name
, ar
.formated
.name
, 16);
381 typed
->name
[strcspn(typed
->name
, " /")]='\0';
383 /* convert the rest of the now valid char header to its typed struct */
384 parse_mode(ar
.formated
.mode
, &typed
->mode
);
385 typed
->mtime
= atoi(ar
.formated
.date
);
386 typed
->uid
= atoi(ar
.formated
.uid
);
387 typed
->gid
= atoi(ar
.formated
.gid
);
392 void free_header_ar(file_header_t
*ar_entry
)
394 if (ar_entry
== NULL
) {
398 free(ar_entry
->name
);
399 free(ar_entry
->link_name
);
405 #ifdef L_get_header_cpio
407 file_header_t
*entry
;
409 struct hardlinks
*next
;
412 file_header_t
*get_header_cpio(FILE *src_stream
)
414 file_header_t
*cpio_entry
= NULL
;
415 char cpio_header
[110];
418 int major
, minor
, nlink
, inode
;
419 static struct hardlinks
*saved_hardlinks
= NULL
;
420 static int pending_hardlinks
= 0;
423 if (pending_hardlinks
) { /* Deal with any pending hardlinks */
424 struct hardlinks
*tmp
= saved_hardlinks
, *oldtmp
= NULL
;
426 if (tmp
->entry
->link_name
) { /* Found a hardlink ready to be extracted */
427 cpio_entry
= tmp
->entry
;
428 if (oldtmp
) oldtmp
->next
= tmp
->next
; /* Remove item from linked list */
429 else saved_hardlinks
= tmp
->next
;
436 pending_hardlinks
= 0; /* No more pending hardlinks, read next file entry */
439 /* There can be padding before archive header */
440 seek_sub_file(src_stream
, (4 - (archive_offset
% 4)) % 4);
441 if (fread(cpio_header
, 1, 110, src_stream
) == 110) {
442 archive_offset
+= 110;
443 if (strncmp(cpio_header
, "07070", 5) != 0) {
444 error_msg("Unsupported format or invalid magic");
447 switch (cpio_header
[5]) {
448 case '2': /* "crc" header format */
449 /* Doesnt do the crc check yet */
450 case '1': /* "newc" header format */
451 cpio_entry
= (file_header_t
*) xcalloc(1, sizeof(file_header_t
));
452 sscanf(cpio_header
, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
453 dummy
, &inode
, (unsigned int*)&cpio_entry
->mode
,
454 (unsigned int*)&cpio_entry
->uid
, (unsigned int*)&cpio_entry
->gid
,
455 &nlink
, &cpio_entry
->mtime
, (unsigned long*)&cpio_entry
->size
,
456 dummy
, &major
, &minor
, &namesize
, dummy
);
458 cpio_entry
->name
= (char *) xcalloc(1, namesize
);
459 fread(cpio_entry
->name
, 1, namesize
, src_stream
); /* Read in filename */
460 archive_offset
+= namesize
;
461 /* Skip padding before file contents */
462 seek_sub_file(src_stream
, (4 - (archive_offset
% 4)) % 4);
463 if (strcmp(cpio_entry
->name
, "TRAILER!!!") == 0) {
464 printf("%d blocks\n", (int) (archive_offset
% 512 ? (archive_offset
/ 512) + 1 : archive_offset
/ 512)); /* Always round up */
465 if (saved_hardlinks
) { /* Bummer - we still have unresolved hardlinks */
466 struct hardlinks
*tmp
= saved_hardlinks
, *oldtmp
= NULL
;
468 error_msg("%s not created: cannot resolve hardlink", tmp
->entry
->name
);
471 free (oldtmp
->entry
->name
);
472 free (oldtmp
->entry
);
475 saved_hardlinks
= NULL
;
476 pending_hardlinks
= 0;
481 if (S_ISLNK(cpio_entry
->mode
)) {
482 cpio_entry
->link_name
= (char *) xcalloc(1, cpio_entry
->size
+ 1);
483 fread(cpio_entry
->link_name
, 1, cpio_entry
->size
, src_stream
);
484 archive_offset
+= cpio_entry
->size
;
485 cpio_entry
->size
= 0; /* Stop possiable seeks in future */
487 if (nlink
> 1 && !S_ISDIR(cpio_entry
->mode
)) {
488 if (cpio_entry
->size
== 0) { /* Put file on a linked list for later */
489 struct hardlinks
*new = xmalloc(sizeof(struct hardlinks
));
490 new->next
= saved_hardlinks
;
492 new->entry
= cpio_entry
;
493 saved_hardlinks
= new;
494 return(get_header_cpio(src_stream
)); /* Recurse to next file */
495 } else { /* Found the file with data in */
496 struct hardlinks
*tmp
= saved_hardlinks
;
497 pending_hardlinks
= 1;
499 if (tmp
->inode
== inode
) {
500 tmp
->entry
->link_name
= xstrdup(cpio_entry
->name
);
505 if (nlink
> 1) error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
508 cpio_entry
->device
= (major
<< 8) | minor
;
511 error_msg("Unsupported format");
514 if (ferror(src_stream
) || feof(src_stream
)) {
515 perror_msg("Stream error");
523 #ifdef L_get_header_tar
524 file_header_t
*get_header_tar(FILE *tar_stream
)
528 unsigned char raw
[512];
530 char name
[100]; /* 0-99 */
531 char mode
[8]; /* 100-107 */
532 char uid
[8]; /* 108-115 */
533 char gid
[8]; /* 116-123 */
534 char size
[12]; /* 124-135 */
535 char mtime
[12]; /* 136-147 */
536 char chksum
[8]; /* 148-155 */
537 char typeflag
; /* 156-156 */
538 char linkname
[100]; /* 157-256 */
539 char magic
[6]; /* 257-262 */
540 char version
[2]; /* 263-264 */
541 char uname
[32]; /* 265-296 */
542 char gname
[32]; /* 297-328 */
543 char devmajor
[8]; /* 329-336 */
544 char devminor
[8]; /* 337-344 */
545 char prefix
[155]; /* 345-499 */
546 char padding
[12]; /* 500-512 */
549 file_header_t
*tar_entry
= NULL
;
553 if (archive_offset
% 512 != 0) {
554 seek_sub_file(tar_stream
, 512 - (archive_offset
% 512));
557 if (fread(tar
.raw
, 1, 512, tar_stream
) != 512) {
558 /* Unfortunatly its common for tar files to have all sorts of
559 * trailing garbage, fail silently */
560 // error_msg("Couldnt read header");
563 archive_offset
+= 512;
565 /* Check header has valid magic, unfortunately some tar files
566 * have empty (0'ed) tar entries at the end, which will
567 * cause this to fail, so fail silently for now
569 if (strncmp(tar
.formated
.magic
, "ustar", 5) != 0) {
570 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
571 if (strncmp(tar
.formated
.magic
, "\0\0\0\0\0", 5) != 0)
576 /* Do checksum on headers */
577 for (i
= 0; i
< 148 ; i
++) {
581 for (i
= 156; i
< 512 ; i
++) {
584 if (sum
!= strtol(tar
.formated
.chksum
, NULL
, 8)) {
585 if ( strtol(tar
.formated
.chksum
,NULL
,8) != 0 )
586 error_msg("Invalid tar header checksum");
590 /* convert to type'ed variables */
591 tar_entry
= xcalloc(1, sizeof(file_header_t
));
593 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
595 tar_entry
->name
= longname
;
599 tar_entry
->name
= linkname
;
603 if (tar
.formated
.prefix
[0] == 0) {
604 tar_entry
->name
= strdup(tar
.formated
.name
);
606 tar_entry
->name
= concat_path_file(tar
.formated
.prefix
, tar
.formated
.name
);
609 // tar_entry->name = xstrdup(tar.formated.name);
612 parse_mode(tar.formated.mode, &tar_entry->mode);
614 tar_entry
->mode
= 07777 & strtol(tar
.formated
.mode
, NULL
, 8);
616 tar_entry
->uid
= strtol(tar
.formated
.uid
, NULL
, 8);
617 tar_entry
->gid
= strtol(tar
.formated
.gid
, NULL
, 8);
618 tar_entry
->size
= strtol(tar
.formated
.size
, NULL
, 8);
619 tar_entry
->mtime
= strtol(tar
.formated
.mtime
, NULL
, 8);
620 tar_entry
->link_name
= strlen(tar
.formated
.linkname
) ?
621 xstrdup(tar
.formated
.linkname
) : NULL
;
622 tar_entry
->device
= (strtol(tar
.formated
.devmajor
, NULL
, 8) << 8) +
623 strtol(tar
.formated
.devminor
, NULL
, 8);
625 /* Fix mode, used by the old format */
626 switch (tar
.formated
.typeflag
) {
627 /* hard links are detected as regular files with 0 size and a link name */
629 tar_entry
->mode
|= S_IFREG
;
634 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
635 if (last_char_is(tar_entry
->name
, '/')) {
636 tar_entry
->mode
|= S_IFDIR
;
639 tar_entry
->mode
|= S_IFREG
;
642 tar_entry
->mode
|= S_IFLNK
;
645 tar_entry
->mode
|= S_IFCHR
;
648 tar_entry
->mode
|= S_IFBLK
;
651 tar_entry
->mode
|= S_IFDIR
;
654 tar_entry
->mode
|= S_IFIFO
;
656 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
658 longname
= xmalloc(tar_entry
->size
+ 1);
659 if(fread(longname
, tar_entry
->size
, 1, tar_stream
) != 1)
661 longname
[tar_entry
->size
] = '\0';
662 archive_offset
+= tar_entry
->size
;
664 return(get_header_tar(tar_stream
));
667 linkname
= xmalloc(tar_entry
->size
+ 1);
668 if(fread(linkname
, tar_entry
->size
, 1, tar_stream
) != 1)
670 linkname
[tar_entry
->size
] = '\0';
671 archive_offset
+= tar_entry
->size
;
673 tar_entry
->name
= linkname
;
674 return(get_header_tar(tar_stream
));
681 perror_msg("Ignoring GNU extension type %c", tar
.formated
.typeflag
);
684 perror_msg("Unknown typeflag: 0x%x", tar
.formated
.typeflag
);
692 void free_header_tar(file_header_t
*tar_entry
)
694 if (tar_entry
== NULL
) {
698 free(tar_entry
->name
);
699 free(tar_entry
->link_name
);
707 char *deb_extract(const char *package_filename
, FILE *out_stream
,
708 const int extract_function
, const char *prefix
, const char *filename
)
711 FILE *uncompressed_stream
= NULL
;
712 file_header_t
*ar_header
= NULL
;
713 char **file_list
= NULL
;
714 char *output_buffer
= NULL
;
715 char *ared_file
= NULL
;
719 if (filename
!= NULL
) {
720 file_list
= xmalloc(sizeof(char *) * 2);
721 file_list
[0] = xstrdup(filename
);
725 if (extract_function
& extract_control_tar_gz
) {
726 ared_file
= xstrdup("control.tar.gz");
728 else if (extract_function
& extract_data_tar_gz
) {
729 ared_file
= xstrdup("data.tar.gz");
731 fprintf(stderr
, "no file specified to extract -- extract_function=%x\n", extract_function
);
735 /* open the debian package to be worked on */
736 deb_stream
= wfopen(package_filename
, "r");
737 if (deb_stream
== NULL
) {
740 /* set the buffer size */
741 setvbuf(deb_stream
, NULL
, _IOFBF
, 0x8000);
744 fread(ar_magic
, 1, 8, deb_stream
);
745 /*fprintf(stderr, "deb_extract ar_magic=%08x\n", *(long *)ar_magic);*/
746 if (strncmp(ar_magic
,"!<arch>",7) == 0) {
749 while ((ar_header
= get_header_ar(deb_stream
)) != NULL
) {
750 if (strcmp(ared_file
, ar_header
->name
) == 0) {
751 /* open a stream of decompressed data */
752 uncompressed_stream
= gz_open(deb_stream
, &gunzip_pid
);
754 output_buffer
= unarchive(uncompressed_stream
, out_stream
, get_header_tar
, free_header_tar
, extract_function
, prefix
, file_list
);
756 seek_sub_file(deb_stream
, ar_header
->size
);
757 free (ar_header
->name
);
760 gz_close(gunzip_pid
);
762 fclose(uncompressed_stream
);
764 return(output_buffer
);
765 } else if (strncmp(ar_magic
, "\037\213", 2) == 0) {
766 /* it's a gz file, let's assume it's an opkg */
767 int unzipped_opkg_pid
;
768 FILE *unzipped_opkg_stream
;
769 file_header_t
*tar_header
;
771 fseek(deb_stream
, 0, SEEK_SET
);
772 unzipped_opkg_stream
= gz_open(deb_stream
, &unzipped_opkg_pid
);
774 /*fprintf(stderr, __FUNCTION__ ": processing opkg %s -- ared_file=%s\n", package_filename, ared_file);*/
775 /* walk through outer tar file to find ared_file */
776 while ((tar_header
= get_header_tar(unzipped_opkg_stream
)) != NULL
) {
778 if (strncmp(tar_header
->name
, "./", 2) == 0)
780 if (strcmp(ared_file
, tar_header
->name
+name_offset
) == 0) {
781 /* open a stream of decompressed data */
782 uncompressed_stream
= gz_open(unzipped_opkg_stream
, &gunzip_pid
);
784 /*fprintf(stderr, __FUNCTION__ ":%d: here -- found file\n", __LINE__);*/
785 output_buffer
= unarchive(uncompressed_stream
,
792 /*fprintf(stderr, __FUNCTION__ ":%d: unarchive complete\n", __LINE__);*/
793 free_header_tar(tar_header
);
794 gz_close(gunzip_pid
);
795 fclose(uncompressed_stream
);
798 seek_sub_file(unzipped_opkg_stream
, tar_header
->size
);
799 free_header_tar(tar_header
);
801 gz_close(unzipped_opkg_pid
);
802 fclose(unzipped_opkg_stream
);
805 /*fprintf(stderr, __FUNCTION__ ":%d: done\n", __LINE__);*/
806 return output_buffer
;
808 error_msg_and_die("invalid magic");