Contents of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/get_header_ar.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
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File size: 4213 byte(s)
Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 4213 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* Copyright 2001 Glenn McGrath. |
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 | static unsigned read_num(const char *str, int base) |
11 | { |
12 | /* This code works because |
13 | * on misformatted numbers bb_strtou returns all-ones */ |
14 | int err = bb_strtou(str, NULL, base); |
15 | if (err == -1) |
16 | bb_error_msg_and_die("invalid ar header"); |
17 | return err; |
18 | } |
19 | |
20 | char FAST_FUNC get_header_ar(archive_handle_t *archive_handle) |
21 | { |
22 | file_header_t *typed = archive_handle->file_header; |
23 | unsigned size; |
24 | union { |
25 | char raw[60]; |
26 | struct { |
27 | char name[16]; |
28 | char date[12]; |
29 | char uid[6]; |
30 | char gid[6]; |
31 | char mode[8]; |
32 | char size[10]; |
33 | char magic[2]; |
34 | } formatted; |
35 | } ar; |
36 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
37 | static char *ar_long_names; |
38 | static unsigned ar_long_name_size; |
39 | #endif |
40 | |
41 | /* dont use xread as we want to handle the error ourself */ |
42 | if (read(archive_handle->src_fd, ar.raw, 60) != 60) { |
43 | /* End Of File */ |
44 | return EXIT_FAILURE; |
45 | } |
46 | |
47 | /* ar header starts on an even byte (2 byte aligned) |
48 | * '\n' is used for padding |
49 | */ |
50 | if (ar.raw[0] == '\n') { |
51 | /* fix up the header, we started reading 1 byte too early */ |
52 | memmove(ar.raw, &ar.raw[1], 59); |
53 | ar.raw[59] = xread_char(archive_handle->src_fd); |
54 | archive_handle->offset++; |
55 | } |
56 | archive_handle->offset += 60; |
57 | |
58 | /* align the headers based on the header magic */ |
59 | if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n') |
60 | bb_error_msg_and_die("invalid ar header"); |
61 | |
62 | /* FIXME: more thorough routine would be in order here |
63 | * (we have something like that in tar) |
64 | * but for now we are lax. */ |
65 | typed->size = size = read_num(ar.formatted.size, 10); |
66 | |
67 | /* special filenames have '/' as the first character */ |
68 | if (ar.formatted.name[0] == '/') { |
69 | if (ar.formatted.name[1] == ' ') { |
70 | /* This is the index of symbols in the file for compilers */ |
71 | data_skip(archive_handle); |
72 | archive_handle->offset += size; |
73 | return get_header_ar(archive_handle); /* Return next header */ |
74 | } |
75 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
76 | if (ar.formatted.name[1] == '/') { |
77 | /* If the second char is a '/' then this entries data section |
78 | * stores long filename for multiple entries, they are stored |
79 | * in static variable long_names for use in future entries |
80 | */ |
81 | ar_long_name_size = size; |
82 | free(ar_long_names); |
83 | ar_long_names = xmalloc(size); |
84 | xread(archive_handle->src_fd, ar_long_names, size); |
85 | archive_handle->offset += size; |
86 | /* Return next header */ |
87 | return get_header_ar(archive_handle); |
88 | } |
89 | #else |
90 | bb_error_msg_and_die("long filenames not supported"); |
91 | #endif |
92 | } |
93 | /* Only size is always present, the rest may be missing in |
94 | * long filename pseudo file. Thus we decode the rest |
95 | * after dealing with long filename pseudo file. |
96 | */ |
97 | typed->mode = read_num(ar.formatted.mode, 8); |
98 | typed->mtime = read_num(ar.formatted.date, 10); |
99 | typed->uid = read_num(ar.formatted.uid, 10); |
100 | typed->gid = read_num(ar.formatted.gid, 10); |
101 | |
102 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
103 | if (ar.formatted.name[0] == '/') { |
104 | unsigned long_offset; |
105 | |
106 | /* The number after the '/' indicates the offset in the ar data section |
107 | * (saved in ar_long_names) that conatains the real filename */ |
108 | long_offset = read_num(&ar.formatted.name[1], 10); |
109 | if (long_offset >= ar_long_name_size) { |
110 | bb_error_msg_and_die("can't resolve long filename"); |
111 | } |
112 | typed->name = xstrdup(ar_long_names + long_offset); |
113 | } else |
114 | #endif |
115 | { |
116 | /* short filenames */ |
117 | typed->name = xstrndup(ar.formatted.name, 16); |
118 | } |
119 | |
120 | typed->name[strcspn(typed->name, " /")] = '\0'; |
121 | |
122 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { |
123 | archive_handle->action_header(typed); |
124 | #if ENABLE_DPKG || ENABLE_DPKG_DEB |
125 | if (archive_handle->dpkg__sub_archive) { |
126 | while (archive_handle->dpkg__action_data_subarchive(archive_handle->dpkg__sub_archive) == EXIT_SUCCESS) |
127 | continue; |
128 | } else |
129 | #endif |
130 | archive_handle->action_data(archive_handle); |
131 | } else { |
132 | data_skip(archive_handle); |
133 | } |
134 | |
135 | archive_handle->offset += typed->size; |
136 | /* Set the file pointer to the correct spot, we may have been reading a compressed file */ |
137 | lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET); |
138 | |
139 | return EXIT_SUCCESS; |
140 | } |