Annotation 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 | niro | 532 | /* 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 | niro | 984 | 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 | niro | 816 | char FAST_FUNC get_header_ar(archive_handle_t *archive_handle) |
21 | niro | 532 | { |
22 | file_header_t *typed = archive_handle->file_header; | ||
23 | niro | 984 | unsigned size; |
24 | niro | 532 | 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 | niro | 816 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
37 | niro | 532 | static char *ar_long_names; |
38 | niro | 816 | static unsigned ar_long_name_size; |
39 | niro | 532 | #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 | niro | 984 | /* 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 | niro | 532 | |
67 | niro | 984 | /* special filenames have '/' as the first character */ |
68 | niro | 532 | if (ar.formatted.name[0] == '/') { |
69 | niro | 984 | 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 | niro | 816 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
76 | niro | 532 | 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 | niro | 984 | * 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 | niro | 816 | } |
89 | niro | 984 | #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 | niro | 816 | |
102 | niro | 984 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
103 | if (ar.formatted.name[0] == '/') { | ||
104 | unsigned long_offset; | ||
105 | niro | 816 | |
106 | /* The number after the '/' indicates the offset in the ar data section | ||
107 | niro | 984 | * (saved in ar_long_names) that conatains the real filename */ |
108 | long_offset = read_num(&ar.formatted.name[1], 10); | ||
109 | niro | 816 | 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 | niro | 984 | } else |
114 | niro | 532 | #endif |
115 | niro | 984 | { |
116 | niro | 532 | /* 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 | niro | 816 | #if ENABLE_DPKG || ENABLE_DPKG_DEB |
125 | niro | 984 | if (archive_handle->dpkg__sub_archive) { |
126 | while (archive_handle->dpkg__action_data_subarchive(archive_handle->dpkg__sub_archive) == EXIT_SUCCESS) | ||
127 | niro | 816 | continue; |
128 | } else | ||
129 | #endif | ||
130 | niro | 532 | 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 | } |