1 /* vi: set sw=4 ts=4: */
2 /* Copyright 2002 Laurence Anderson
4 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 typedef struct hardlinks_s {
13 struct hardlinks_s *next;
16 char get_header_cpio(archive_handle_t *archive_handle)
18 static hardlinks_t *saved_hardlinks = NULL;
19 static unsigned short pending_hardlinks = 0;
20 file_header_t *file_header = archive_handle->file_header;
21 char cpio_header[110];
24 int major, minor, nlink, inode;
26 if (pending_hardlinks) { /* Deal with any pending hardlinks */
30 tmp = saved_hardlinks;
34 bb_error_msg_and_die("need to fix this");
35 if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
36 file_header = tmp->entry;
38 oldtmp->next = tmp->next; /* Remove item from linked list */
40 saved_hardlinks = tmp->next;
48 pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
51 /* There can be padding before archive header */
52 data_align(archive_handle, 4);
54 if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
57 archive_handle->offset += 110;
59 if ((strncmp(&cpio_header[0], "07070", 5) != 0) || ((cpio_header[5] != '1') && (cpio_header[5] != '2'))) {
60 bb_error_msg_and_die("unsupported cpio format, use newc or crc");
64 unsigned long tmpsize;
65 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
66 dummy, &inode, (unsigned int*)&file_header->mode,
67 (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
68 &nlink, &file_header->mtime, &tmpsize,
69 dummy, &major, &minor, &namesize, dummy);
70 file_header->size = tmpsize;
73 file_header->name = (char *) xzalloc(namesize + 1);
74 /* Read in filename */
75 xread(archive_handle->src_fd, file_header->name, namesize);
76 archive_handle->offset += namesize;
78 /* Update offset amount and skip padding before file contents */
79 data_align(archive_handle, 4);
81 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
82 printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
83 if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
84 hardlinks_t *tmp = saved_hardlinks;
85 hardlinks_t *oldtmp = NULL;
87 bb_error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
90 free (oldtmp->entry->name);
94 saved_hardlinks = NULL;
95 pending_hardlinks = 0;
100 if (S_ISLNK(file_header->mode)) {
101 file_header->link_name = (char *) xzalloc(file_header->size + 1);
102 xread(archive_handle->src_fd, file_header->link_name, file_header->size);
103 archive_handle->offset += file_header->size;
104 file_header->size = 0; /* Stop possible seeks in future */
106 file_header->link_name = NULL;
108 if (nlink > 1 && !S_ISDIR(file_header->mode)) {
109 if (file_header->size == 0) { /* Put file on a linked list for later */
110 hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
111 new->next = saved_hardlinks;
113 new->entry = file_header;
114 saved_hardlinks = new;
115 return(EXIT_SUCCESS); // Skip this one
116 } else { /* Found the file with data in */
117 hardlinks_t *tmp = saved_hardlinks;
118 pending_hardlinks = 1;
120 if (tmp->inode == inode) {
121 tmp->entry->link_name = xstrdup(file_header->name);
127 bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
131 file_header->device = makedev(major, minor);
133 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
134 archive_handle->action_data(archive_handle);
135 archive_handle->action_header(archive_handle->file_header);
137 data_skip(archive_handle);
140 archive_handle->offset += file_header->size;
142 free(file_header->link_name);
144 return (EXIT_SUCCESS);