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 {
11 struct hardlinks_s *next;
12 int inode; /* TODO: must match maj/min too! */
14 int mtime; /* These three are useful only in corner case */
15 int uid ; /* of hardlinks with zero size body */
20 char get_header_cpio(archive_handle_t *archive_handle)
22 static hardlinks_t *saved_hardlinks = NULL;
23 static hardlinks_t *saved_hardlinks_created = NULL;
25 file_header_t *file_header = archive_handle->file_header;
26 char cpio_header[110];
29 int major, minor, nlink, mode, inode;
30 unsigned size, uid, gid, mtime;
32 /* There can be padding before archive header */
33 data_align(archive_handle, 4);
35 if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
36 goto create_hardlinks;
38 archive_handle->offset += 110;
40 if (strncmp(&cpio_header[0], "07070", 5) != 0
41 || (cpio_header[5] != '1' && cpio_header[5] != '2')
43 bb_error_msg_and_die("unsupported cpio format, use newc or crc");
46 sscanf(cpio_header + 6,
47 "%8x" "%8x" "%8x" "%8x"
48 "%8x" "%8x" "%8x" /*maj,min:*/ "%16c"
49 /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum:*/ "%8c",
50 &inode, &mode, &uid, &gid,
51 &nlink, &mtime, &size, dummy,
52 &major, &minor, &namesize, dummy);
53 file_header->mode = mode;
54 file_header->uid = uid;
55 file_header->gid = gid;
56 file_header->mtime = mtime;
57 file_header->size = size;
59 file_header->name = xzalloc(namesize + 1);
60 /* Read in filename */
61 xread(archive_handle->src_fd, file_header->name, namesize);
62 archive_handle->offset += namesize;
64 /* Update offset amount and skip padding before file contents */
65 data_align(archive_handle, 4);
67 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
68 /* Always round up. ">> 9" divides by 512 */
69 printf("%"OFF_FMT"u blocks\n", (archive_handle->offset + 511) >> 9);
70 goto create_hardlinks;
73 if (S_ISLNK(file_header->mode)) {
74 file_header->link_target = xzalloc(file_header->size + 1);
75 xread(archive_handle->src_fd, file_header->link_target, file_header->size);
76 archive_handle->offset += file_header->size;
77 file_header->size = 0; /* Stop possible seeks in future */
79 file_header->link_target = NULL;
82 // TODO: data_extract_all can't deal with hardlinks to non-files...
83 // (should be !S_ISDIR instead of S_ISREG here)
85 if (nlink > 1 && S_ISREG(file_header->mode)) {
86 hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
92 strcpy(new->name, file_header->name);
93 /* Put file on a linked list for later */
95 new->next = saved_hardlinks;
96 saved_hardlinks = new;
97 return EXIT_SUCCESS; /* Skip this one */
98 /* TODO: this breaks cpio -t (it does not show hardlinks) */
100 new->next = saved_hardlinks_created;
101 saved_hardlinks_created = new;
103 file_header->device = makedev(major, minor);
105 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
106 archive_handle->action_data(archive_handle);
107 archive_handle->action_header(file_header);
109 data_skip(archive_handle);
112 archive_handle->offset += file_header->size;
114 free(file_header->link_target);
115 free(file_header->name);
116 file_header->link_target = NULL;
117 file_header->name = NULL;
122 free(file_header->link_target);
123 free(file_header->name);
125 while (saved_hardlinks) {
127 hardlinks_t *make_me = saved_hardlinks;
128 saved_hardlinks = make_me->next;
130 memset(file_header, 0, sizeof(*file_header));
131 file_header->name = make_me->name;
132 file_header->mode = make_me->mode;
133 /*file_header->size = 0;*/
135 /* Try to find a file we are hardlinked to */
136 cur = saved_hardlinks_created;
138 /* TODO: must match maj/min too! */
139 if (cur->inode == make_me->inode) {
140 file_header->link_target = cur->name;
141 /* link_target != NULL, size = 0: "I am a hardlink" */
142 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
143 archive_handle->action_data(archive_handle);
148 /* Oops... no file with such inode was created... do it now
149 * (happens when hardlinked files are empty (zero length)) */
150 file_header->mtime = make_me->mtime;
151 file_header->uid = make_me->uid ;
152 file_header->gid = make_me->gid ;
153 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
154 archive_handle->action_data(archive_handle);
155 /* Move to the list of created hardlinked files */
156 make_me->next = saved_hardlinks_created;
157 saved_hardlinks_created = make_me;
161 while (saved_hardlinks_created) {
162 hardlinks_t *p = saved_hardlinks_created;
163 saved_hardlinks_created = p->next;
167 return EXIT_FAILURE; /* "No more files to process" */