source: MondoRescue/branches/3.2/mindi-busybox/archival/libunarchive/get_header_cpio.c@ 3232

Last change on this file since 3232 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 4.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* Copyright 2002 Laurence Anderson
3 *
4 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
5 */
6
7#include "libbb.h"
8#include "unarchive.h"
9
10typedef struct hardlinks_s {
11 char *name;
12 int inode;
13 struct hardlinks_s *next;
14} hardlinks_t;
15
16char get_header_cpio(archive_handle_t *archive_handle)
17{
18 static hardlinks_t *saved_hardlinks = NULL;
19 static unsigned pending_hardlinks = 0;
20 static int inode;
21
22 file_header_t *file_header = archive_handle->file_header;
23 char cpio_header[110];
24 int namesize;
25 char dummy[16];
26 int major, minor, nlink;
27
28 if (pending_hardlinks) { /* Deal with any pending hardlinks */
29 hardlinks_t *tmp, *oldtmp;
30
31 tmp = saved_hardlinks;
32 oldtmp = NULL;
33
34 file_header->link_target = file_header->name;
35 file_header->size = 0;
36
37 while (tmp) {
38 if (tmp->inode != inode) {
39 tmp = tmp->next;
40 continue;
41 }
42
43 file_header->name = tmp->name;
44
45 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
46 archive_handle->action_data(archive_handle);
47 archive_handle->action_header(archive_handle->file_header);
48 }
49
50 pending_hardlinks--;
51
52 oldtmp = tmp;
53 tmp = tmp->next;
54 free(oldtmp->name);
55 free(oldtmp);
56 if (oldtmp == saved_hardlinks)
57 saved_hardlinks = tmp;
58 }
59
60 file_header->name = file_header->link_target;
61
62 if (pending_hardlinks > 1) {
63 bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
64 }
65
66 /* No more pending hardlinks, read next file entry */
67 pending_hardlinks = 0;
68 }
69
70 /* There can be padding before archive header */
71 data_align(archive_handle, 4);
72
73 if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
74 return EXIT_FAILURE;
75 }
76 archive_handle->offset += 110;
77
78 if (strncmp(&cpio_header[0], "07070", 5) != 0
79 || (cpio_header[5] != '1' && cpio_header[5] != '2')
80 ) {
81 bb_error_msg_and_die("unsupported cpio format, use newc or crc");
82 }
83
84 {
85 unsigned long tmpsize;
86 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
87 dummy, &inode, (unsigned int*)&file_header->mode,
88 (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid,
89 &nlink, &file_header->mtime, &tmpsize,
90 dummy, &major, &minor, &namesize, dummy);
91 file_header->size = tmpsize;
92 }
93
94 free(file_header->name);
95 file_header->name = xzalloc(namesize + 1);
96 /* Read in filename */
97 xread(archive_handle->src_fd, file_header->name, namesize);
98 archive_handle->offset += namesize;
99
100 /* Update offset amount and skip padding before file contents */
101 data_align(archive_handle, 4);
102
103 if (strcmp(file_header->name, "TRAILER!!!") == 0) {
104 /* Always round up */
105 printf("%d blocks\n", (int) (archive_handle->offset % 512 ?
106 archive_handle->offset / 512 + 1 :
107 archive_handle->offset / 512
108 ));
109 if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
110 hardlinks_t *tmp = saved_hardlinks;
111 hardlinks_t *oldtmp = NULL;
112 while (tmp) {
113 bb_error_msg("%s not created: cannot resolve hardlink", tmp->name);
114 oldtmp = tmp;
115 tmp = tmp->next;
116 free(oldtmp->name);
117 free(oldtmp);
118 }
119 saved_hardlinks = NULL;
120 pending_hardlinks = 0;
121 }
122 return EXIT_FAILURE;
123 }
124
125 if (S_ISLNK(file_header->mode)) {
126 file_header->link_target = xzalloc(file_header->size + 1);
127 xread(archive_handle->src_fd, file_header->link_target, file_header->size);
128 archive_handle->offset += file_header->size;
129 file_header->size = 0; /* Stop possible seeks in future */
130 } else {
131 file_header->link_target = NULL;
132 }
133 if (nlink > 1 && !S_ISDIR(file_header->mode)) {
134 if (file_header->size == 0) { /* Put file on a linked list for later */
135 hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
136 new->next = saved_hardlinks;
137 new->inode = inode;
138 /* name current allocated, freed later */
139 new->name = file_header->name;
140 file_header->name = NULL;
141 saved_hardlinks = new;
142 return EXIT_SUCCESS; /* Skip this one */
143 }
144 /* Found the file with data in */
145 pending_hardlinks = nlink;
146 }
147 file_header->device = makedev(major, minor);
148
149 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
150 archive_handle->action_data(archive_handle);
151 archive_handle->action_header(archive_handle->file_header);
152 } else {
153 data_skip(archive_handle);
154 }
155
156 archive_handle->offset += file_header->size;
157
158 free(file_header->link_target);
159
160 return EXIT_SUCCESS;
161}
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