Contents of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/get_header_ar.c
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Wed Aug 18 21:56:57 2010 UTC (13 years, 8 months ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (13 years, 8 months ago) by niro
File MIME type: text/plain
File size: 4147 byte(s)
-updated to busybox-1.17.1
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 | #include "ar.h" |
10 | |
11 | static unsigned read_num(const char *str, int base) |
12 | { |
13 | /* This code works because |
14 | * on misformatted numbers bb_strtou returns all-ones */ |
15 | int err = bb_strtou(str, NULL, base); |
16 | if (err == -1) |
17 | bb_error_msg_and_die("invalid ar header"); |
18 | return err; |
19 | } |
20 | |
21 | char FAST_FUNC get_header_ar(archive_handle_t *archive_handle) |
22 | { |
23 | file_header_t *typed = archive_handle->file_header; |
24 | unsigned size; |
25 | union { |
26 | char raw[60]; |
27 | struct ar_header formatted; |
28 | } ar; |
29 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
30 | static char *ar_long_names; |
31 | static unsigned ar_long_name_size; |
32 | #endif |
33 | |
34 | /* dont use xread as we want to handle the error ourself */ |
35 | if (read(archive_handle->src_fd, ar.raw, 60) != 60) { |
36 | /* End Of File */ |
37 | return EXIT_FAILURE; |
38 | } |
39 | |
40 | /* ar header starts on an even byte (2 byte aligned) |
41 | * '\n' is used for padding |
42 | */ |
43 | if (ar.raw[0] == '\n') { |
44 | /* fix up the header, we started reading 1 byte too early */ |
45 | memmove(ar.raw, &ar.raw[1], 59); |
46 | ar.raw[59] = xread_char(archive_handle->src_fd); |
47 | archive_handle->offset++; |
48 | } |
49 | archive_handle->offset += 60; |
50 | |
51 | if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n') |
52 | bb_error_msg_and_die("invalid ar header"); |
53 | |
54 | /* FIXME: more thorough routine would be in order here |
55 | * (we have something like that in tar) |
56 | * but for now we are lax. */ |
57 | ar.formatted.magic[0] = '\0'; /* else 4G-2 file will have size="4294967294`\n..." */ |
58 | typed->size = size = read_num(ar.formatted.size, 10); |
59 | |
60 | /* special filenames have '/' as the first character */ |
61 | if (ar.formatted.name[0] == '/') { |
62 | if (ar.formatted.name[1] == ' ') { |
63 | /* This is the index of symbols in the file for compilers */ |
64 | data_skip(archive_handle); |
65 | archive_handle->offset += size; |
66 | return get_header_ar(archive_handle); /* Return next header */ |
67 | } |
68 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
69 | if (ar.formatted.name[1] == '/') { |
70 | /* If the second char is a '/' then this entries data section |
71 | * stores long filename for multiple entries, they are stored |
72 | * in static variable long_names for use in future entries |
73 | */ |
74 | ar_long_name_size = size; |
75 | free(ar_long_names); |
76 | ar_long_names = xmalloc(size); |
77 | xread(archive_handle->src_fd, ar_long_names, size); |
78 | archive_handle->offset += size; |
79 | /* Return next header */ |
80 | return get_header_ar(archive_handle); |
81 | } |
82 | #else |
83 | bb_error_msg_and_die("long filenames not supported"); |
84 | #endif |
85 | } |
86 | /* Only size is always present, the rest may be missing in |
87 | * long filename pseudo file. Thus we decode the rest |
88 | * after dealing with long filename pseudo file. |
89 | */ |
90 | typed->mode = read_num(ar.formatted.mode, 8); |
91 | typed->mtime = read_num(ar.formatted.date, 10); |
92 | typed->uid = read_num(ar.formatted.uid, 10); |
93 | typed->gid = read_num(ar.formatted.gid, 10); |
94 | |
95 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
96 | if (ar.formatted.name[0] == '/') { |
97 | unsigned long_offset; |
98 | |
99 | /* The number after the '/' indicates the offset in the ar data section |
100 | * (saved in ar_long_names) that conatains the real filename */ |
101 | long_offset = read_num(&ar.formatted.name[1], 10); |
102 | if (long_offset >= ar_long_name_size) { |
103 | bb_error_msg_and_die("can't resolve long filename"); |
104 | } |
105 | typed->name = xstrdup(ar_long_names + long_offset); |
106 | } else |
107 | #endif |
108 | { |
109 | /* short filenames */ |
110 | typed->name = xstrndup(ar.formatted.name, 16); |
111 | } |
112 | |
113 | typed->name[strcspn(typed->name, " /")] = '\0'; |
114 | |
115 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { |
116 | archive_handle->action_header(typed); |
117 | #if ENABLE_DPKG || ENABLE_DPKG_DEB |
118 | if (archive_handle->dpkg__sub_archive) { |
119 | while (archive_handle->dpkg__action_data_subarchive(archive_handle->dpkg__sub_archive) == EXIT_SUCCESS) |
120 | continue; |
121 | } else |
122 | #endif |
123 | archive_handle->action_data(archive_handle); |
124 | } else { |
125 | data_skip(archive_handle); |
126 | } |
127 | |
128 | archive_handle->offset += typed->size; |
129 | /* Set the file pointer to the correct spot, we may have been reading a compressed file */ |
130 | lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET); |
131 | |
132 | return EXIT_SUCCESS; |
133 | } |