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;
21 file_header_t *file_header = archive_handle->file_header;
22 char cpio_header[110];
25 int major, minor, nlink;
27 if (pending_hardlinks) { /* Deal with any pending hardlinks */
28 hardlinks_t *tmp, *oldtmp;
30 tmp = saved_hardlinks;
33 file_header->link_name = file_header->name;
34 file_header->size = 0;
37 if (tmp->inode != inode) {
42 file_header->name = tmp->name;
44 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
45 archive_handle->action_data(archive_handle);
46 archive_handle->action_header(archive_handle->file_header);
55 if (oldtmp == saved_hardlinks)
56 saved_hardlinks = tmp;
59 file_header->name = file_header->link_name;
61 if (pending_hardlinks > 1) {
62 bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
65 /* No more pending hardlinks, read next file entry */
66 pending_hardlinks = 0;
69 /* There can be padding before archive header */
70 data_align(archive_handle, 4);
72 if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
75 archive_handle->offset += 110;
77 if (strncmp(&cpio_header[0], "07070", 5) != 0
78 || (cpio_header[5] != '1' && cpio_header[5] != '2')
80 bb_error_msg_and_die("unsupported cpio format, use newc or crc");
84 unsigned long tmpsize;
85 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
86 dummy, &inode, (unsigned int*)&file_header->mode,
87 (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
88 &nlink, &file_header->mtime, &tmpsize,
89 dummy, &major, &minor, &namesize, dummy);
90 file_header->size = tmpsize;
93 free(file_header->name);
94 file_header->name = xzalloc(namesize + 1);
95 /* Read in filename */
96 xread(archive_handle->src_fd, file_header->name, namesize);
97 archive_handle->offset += namesize;
99 /* Update offset amount and skip padding before file contents */
100 data_align(archive_handle, 4);
102 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
103 /* Always round up */
104 printf("%d blocks\n", (int) (archive_handle->offset % 512 ?
105 archive_handle->offset / 512 + 1 :
106 archive_handle->offset / 512
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->name);
118 saved_hardlinks = NULL;
119 pending_hardlinks = 0;
124 if (S_ISLNK(file_header->mode)) {
125 file_header->link_name = xzalloc(file_header->size + 1);
126 xread(archive_handle->src_fd, file_header->link_name, file_header->size);
127 archive_handle->offset += file_header->size;
128 file_header->size = 0; /* Stop possible seeks in future */
130 file_header->link_name = NULL;
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 /* name current allocated, freed later */
138 new->name = file_header->name;
139 file_header->name = NULL;
140 saved_hardlinks = new;
141 return EXIT_SUCCESS; /* Skip this one */
143 /* Found the file with data in */
144 pending_hardlinks = nlink;
146 file_header->device = makedev(major, minor);
148 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
149 archive_handle->action_data(archive_handle);
150 archive_handle->action_header(archive_handle->file_header);
152 data_skip(archive_handle);
155 archive_handle->offset += file_header->size;
157 free(file_header->link_name);