Annotation of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/get_header_cpio.c
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Revision 532 -
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 4452 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | niro | 532 | /* 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 | |||
10 | typedef struct hardlinks_s { | ||
11 | char *name; | ||
12 | int inode; | ||
13 | struct hardlinks_s *next; | ||
14 | } hardlinks_t; | ||
15 | |||
16 | char get_header_cpio(archive_handle_t *archive_handle) | ||
17 | { | ||
18 | static hardlinks_t *saved_hardlinks = NULL; | ||
19 | static unsigned short pending_hardlinks = 0; | ||
20 | static int inode; | ||
21 | file_header_t *file_header = archive_handle->file_header; | ||
22 | char cpio_header[110]; | ||
23 | int namesize; | ||
24 | char dummy[16]; | ||
25 | int major, minor, nlink; | ||
26 | |||
27 | if (pending_hardlinks) { /* Deal with any pending hardlinks */ | ||
28 | hardlinks_t *tmp, *oldtmp; | ||
29 | |||
30 | tmp = saved_hardlinks; | ||
31 | oldtmp = NULL; | ||
32 | |||
33 | file_header->link_name = file_header->name; | ||
34 | file_header->size = 0; | ||
35 | |||
36 | while (tmp) { | ||
37 | if (tmp->inode != inode) { | ||
38 | tmp = tmp->next; | ||
39 | continue; | ||
40 | } | ||
41 | |||
42 | file_header->name = tmp->name; | ||
43 | |||
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); | ||
47 | } | ||
48 | |||
49 | pending_hardlinks--; | ||
50 | |||
51 | oldtmp = tmp; | ||
52 | tmp = tmp->next; | ||
53 | free(oldtmp->name); | ||
54 | free(oldtmp); | ||
55 | if (oldtmp == saved_hardlinks) | ||
56 | saved_hardlinks = tmp; | ||
57 | } | ||
58 | |||
59 | file_header->name = file_header->link_name; | ||
60 | |||
61 | if (pending_hardlinks > 1) { | ||
62 | bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?"); | ||
63 | } | ||
64 | |||
65 | /* No more pending hardlinks, read next file entry */ | ||
66 | pending_hardlinks = 0; | ||
67 | } | ||
68 | |||
69 | /* There can be padding before archive header */ | ||
70 | data_align(archive_handle, 4); | ||
71 | |||
72 | if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) { | ||
73 | return EXIT_FAILURE; | ||
74 | } | ||
75 | archive_handle->offset += 110; | ||
76 | |||
77 | if (strncmp(&cpio_header[0], "07070", 5) != 0 | ||
78 | || (cpio_header[5] != '1' && cpio_header[5] != '2') | ||
79 | ) { | ||
80 | bb_error_msg_and_die("unsupported cpio format, use newc or crc"); | ||
81 | } | ||
82 | |||
83 | { | ||
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; | ||
91 | } | ||
92 | |||
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; | ||
98 | |||
99 | /* Update offset amount and skip padding before file contents */ | ||
100 | data_align(archive_handle, 4); | ||
101 | |||
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 | ||
107 | )); | ||
108 | if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */ | ||
109 | hardlinks_t *tmp = saved_hardlinks; | ||
110 | hardlinks_t *oldtmp = NULL; | ||
111 | while (tmp) { | ||
112 | bb_error_msg("%s not created: cannot resolve hardlink", tmp->name); | ||
113 | oldtmp = tmp; | ||
114 | tmp = tmp->next; | ||
115 | free(oldtmp->name); | ||
116 | free(oldtmp); | ||
117 | } | ||
118 | saved_hardlinks = NULL; | ||
119 | pending_hardlinks = 0; | ||
120 | } | ||
121 | return EXIT_FAILURE; | ||
122 | } | ||
123 | |||
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 */ | ||
129 | } else { | ||
130 | file_header->link_name = NULL; | ||
131 | } | ||
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; | ||
136 | new->inode = inode; | ||
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 */ | ||
142 | } | ||
143 | /* Found the file with data in */ | ||
144 | pending_hardlinks = nlink; | ||
145 | } | ||
146 | file_header->device = makedev(major, minor); | ||
147 | |||
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); | ||
151 | } else { | ||
152 | data_skip(archive_handle); | ||
153 | } | ||
154 | |||
155 | archive_handle->offset += file_header->size; | ||
156 | |||
157 | free(file_header->link_name); | ||
158 | |||
159 | return EXIT_SUCCESS; | ||
160 | } |