2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU Library General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include "unarchive.h"
24 typedef struct hardlinks_s {
27 struct hardlinks_s *next;
30 extern char get_header_cpio(archive_handle_t *archive_handle)
32 static hardlinks_t *saved_hardlinks = NULL;
33 static unsigned short pending_hardlinks = 0;
34 file_header_t *file_header = archive_handle->file_header;
35 char cpio_header[110];
38 int major, minor, nlink, inode;
41 if (pending_hardlinks) { /* Deal with any pending hardlinks */
45 tmp = saved_hardlinks;
49 bb_error_msg_and_die("need to fix this\n");
50 if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
51 file_header = tmp->entry;
53 oldtmp->next = tmp->next; /* Remove item from linked list */
55 saved_hardlinks = tmp->next;
63 pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
66 /* There can be padding before archive header */
67 data_align(archive_handle, 4);
69 if (archive_xread_all_eof(archive_handle, cpio_header, 110) == 0) {
72 archive_handle->offset += 110;
74 if (strncmp(&cpio_header[0], "07070", 5) != 0) {
75 printf("cpio header is %x-%x-%x-%x-%x\n",
81 bb_error_msg_and_die("Unsupported cpio format");
84 if ((cpio_header[5] != '1') && (cpio_header[5] != '2')) {
85 bb_error_msg_and_die("Unsupported cpio format, use newc or crc");
89 unsigned long tmpsize;
90 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
91 dummy, &inode, (unsigned int*)&file_header->mode,
92 (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
93 &nlink, &file_header->mtime, &tmpsize,
94 dummy, &major, &minor, &namesize, dummy);
95 file_header->size = tmpsize;
98 file_header->name = (char *) xmalloc(namesize + 1);
99 archive_xread_all(archive_handle, file_header->name, namesize); /* Read in filename */
100 file_header->name[namesize] = '\0';
101 archive_handle->offset += namesize;
103 /* Update offset amount and skip padding before file contents */
104 data_align(archive_handle, 4);
106 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
107 printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
108 if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
109 hardlinks_t *tmp = saved_hardlinks;
110 hardlinks_t *oldtmp = NULL;
112 bb_error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
115 free (oldtmp->entry->name);
116 free (oldtmp->entry);
119 saved_hardlinks = NULL;
120 pending_hardlinks = 0;
122 return(EXIT_FAILURE);
125 if (S_ISLNK(file_header->mode)) {
126 file_header->link_name = (char *) xmalloc(file_header->size + 1);
127 archive_xread_all(archive_handle, file_header->link_name, file_header->size);
128 file_header->link_name[file_header->size] = '\0';
129 archive_handle->offset += file_header->size;
130 file_header->size = 0; /* Stop possible seeks in future */
132 if (nlink > 1 && !S_ISDIR(file_header->mode)) {
133 if (file_header->size == 0) { /* Put file on a linked list for later */
134 hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
135 new->next = saved_hardlinks;
137 new->entry = file_header;
138 saved_hardlinks = new;
139 return(EXIT_SUCCESS); // Skip this one
140 } else { /* Found the file with data in */
141 hardlinks_t *tmp = saved_hardlinks;
142 pending_hardlinks = 1;
144 if (tmp->inode == inode) {
145 tmp->entry->link_name = bb_xstrdup(file_header->name);
151 bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
155 file_header->device = (major << 8) | minor;
157 extract_flag = FALSE;
158 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
163 /* Check if the file already exists */
164 if (lstat (file_header->name, &statbuf) == 0) {
165 if ((archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) || (statbuf.st_mtime < file_header->mtime)) {
166 /* Remove file if flag set or its older than the file to be extracted */
167 if (unlink(file_header->name) == -1) {
168 bb_perror_msg_and_die("Couldnt remove old file");
171 if (! archive_handle->flags & ARCHIVE_EXTRACT_QUIET) {
172 bb_error_msg("%s not created: newer or same age file exists", file_header->name);
174 extract_flag = FALSE;
177 archive_handle->action_header(file_header);
180 archive_handle->action_header(file_header);
182 archive_handle->action_data(archive_handle);
184 data_skip(archive_handle);
186 archive_handle->offset += file_header->size;
187 return (EXIT_SUCCESS);