Annotation of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/get_header_ar.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
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File size: 4289 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 4289 byte(s)
-updated to busybox-1.13.4
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 | 816 | char FAST_FUNC get_header_ar(archive_handle_t *archive_handle) |
11 | niro | 532 | { |
12 | int err; | ||
13 | file_header_t *typed = archive_handle->file_header; | ||
14 | union { | ||
15 | char raw[60]; | ||
16 | struct { | ||
17 | char name[16]; | ||
18 | char date[12]; | ||
19 | char uid[6]; | ||
20 | char gid[6]; | ||
21 | char mode[8]; | ||
22 | char size[10]; | ||
23 | char magic[2]; | ||
24 | } formatted; | ||
25 | } ar; | ||
26 | niro | 816 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
27 | niro | 532 | static char *ar_long_names; |
28 | niro | 816 | static unsigned ar_long_name_size; |
29 | niro | 532 | #endif |
30 | |||
31 | /* dont use xread as we want to handle the error ourself */ | ||
32 | if (read(archive_handle->src_fd, ar.raw, 60) != 60) { | ||
33 | /* End Of File */ | ||
34 | return EXIT_FAILURE; | ||
35 | } | ||
36 | |||
37 | /* ar header starts on an even byte (2 byte aligned) | ||
38 | * '\n' is used for padding | ||
39 | */ | ||
40 | if (ar.raw[0] == '\n') { | ||
41 | /* fix up the header, we started reading 1 byte too early */ | ||
42 | memmove(ar.raw, &ar.raw[1], 59); | ||
43 | ar.raw[59] = xread_char(archive_handle->src_fd); | ||
44 | archive_handle->offset++; | ||
45 | } | ||
46 | archive_handle->offset += 60; | ||
47 | |||
48 | /* align the headers based on the header magic */ | ||
49 | if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n') | ||
50 | bb_error_msg_and_die("invalid ar header"); | ||
51 | |||
52 | /* FIXME: more thorough routine would be in order here */ | ||
53 | /* (we have something like that in tar) */ | ||
54 | /* but for now we are lax. This code works because */ | ||
55 | /* on misformatted numbers bb_strtou returns all-ones */ | ||
56 | typed->mode = err = bb_strtou(ar.formatted.mode, NULL, 8); | ||
57 | if (err == -1) bb_error_msg_and_die("invalid ar header"); | ||
58 | typed->mtime = err = bb_strtou(ar.formatted.date, NULL, 10); | ||
59 | if (err == -1) bb_error_msg_and_die("invalid ar header"); | ||
60 | typed->uid = err = bb_strtou(ar.formatted.uid, NULL, 10); | ||
61 | if (err == -1) bb_error_msg_and_die("invalid ar header"); | ||
62 | typed->gid = err = bb_strtou(ar.formatted.gid, NULL, 10); | ||
63 | if (err == -1) bb_error_msg_and_die("invalid ar header"); | ||
64 | typed->size = err = bb_strtou(ar.formatted.size, NULL, 10); | ||
65 | if (err == -1) bb_error_msg_and_die("invalid ar header"); | ||
66 | |||
67 | /* long filenames have '/' as the first character */ | ||
68 | if (ar.formatted.name[0] == '/') { | ||
69 | niro | 816 | #if ENABLE_FEATURE_AR_LONG_FILENAMES |
70 | unsigned long_offset; | ||
71 | |||
72 | niro | 532 | if (ar.formatted.name[1] == '/') { |
73 | /* If the second char is a '/' then this entries data section | ||
74 | * stores long filename for multiple entries, they are stored | ||
75 | * in static variable long_names for use in future entries */ | ||
76 | ar_long_name_size = typed->size; | ||
77 | ar_long_names = xmalloc(ar_long_name_size); | ||
78 | xread(archive_handle->src_fd, ar_long_names, ar_long_name_size); | ||
79 | archive_handle->offset += ar_long_name_size; | ||
80 | /* This ar entries data section only contained filenames for other records | ||
81 | * they are stored in the static ar_long_names for future reference */ | ||
82 | return get_header_ar(archive_handle); /* Return next header */ | ||
83 | niro | 816 | } |
84 | |||
85 | if (ar.formatted.name[1] == ' ') { | ||
86 | niro | 532 | /* This is the index of symbols in the file for compilers */ |
87 | data_skip(archive_handle); | ||
88 | archive_handle->offset += typed->size; | ||
89 | return get_header_ar(archive_handle); /* Return next header */ | ||
90 | } | ||
91 | niro | 816 | |
92 | /* The number after the '/' indicates the offset in the ar data section | ||
93 | * (saved in variable long_name) that conatains the real filename */ | ||
94 | long_offset = atoi(&ar.formatted.name[1]); | ||
95 | if (long_offset >= ar_long_name_size) { | ||
96 | bb_error_msg_and_die("can't resolve long filename"); | ||
97 | } | ||
98 | typed->name = xstrdup(ar_long_names + long_offset); | ||
99 | niro | 532 | #else |
100 | bb_error_msg_and_die("long filenames not supported"); | ||
101 | #endif | ||
102 | } else { | ||
103 | /* short filenames */ | ||
104 | typed->name = xstrndup(ar.formatted.name, 16); | ||
105 | } | ||
106 | |||
107 | typed->name[strcspn(typed->name, " /")] = '\0'; | ||
108 | |||
109 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { | ||
110 | archive_handle->action_header(typed); | ||
111 | niro | 816 | #if ENABLE_DPKG || ENABLE_DPKG_DEB |
112 | niro | 532 | if (archive_handle->sub_archive) { |
113 | while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS) | ||
114 | niro | 816 | continue; |
115 | } else | ||
116 | #endif | ||
117 | niro | 532 | archive_handle->action_data(archive_handle); |
118 | } else { | ||
119 | data_skip(archive_handle); | ||
120 | } | ||
121 | |||
122 | archive_handle->offset += typed->size; | ||
123 | /* Set the file pointer to the correct spot, we may have been reading a compressed file */ | ||
124 | lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET); | ||
125 | |||
126 | return EXIT_SUCCESS; | ||
127 | } |