Annotation of /trunk/mkinitrd-magellan/busybox/archival/rpm2cpio.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: 2313 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 2313 byte(s)
-updated to busybox-1.13.4
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * Mini rpm2cpio implementation for busybox | ||
4 | * | ||
5 | * Copyright (C) 2001 by Laurence Anderson | ||
6 | * | ||
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
8 | */ | ||
9 | niro | 816 | #include "libbb.h" |
10 | niro | 532 | #include "unarchive.h" |
11 | |||
12 | #define RPM_MAGIC "\355\253\356\333" | ||
13 | #define RPM_HEADER_MAGIC "\216\255\350" | ||
14 | |||
15 | struct rpm_lead { | ||
16 | niro | 816 | unsigned char magic[4]; |
17 | uint8_t major, minor; | ||
18 | uint16_t type; | ||
19 | uint16_t archnum; | ||
20 | char name[66]; | ||
21 | uint16_t osnum; | ||
22 | uint16_t signature_type; | ||
23 | char reserved[16]; | ||
24 | niro | 532 | }; |
25 | |||
26 | struct rpm_header { | ||
27 | char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */ | ||
28 | uint8_t version; /* 1 byte version number */ | ||
29 | uint32_t reserved; /* 4 bytes reserved */ | ||
30 | uint32_t entries; /* Number of entries in header (4 bytes) */ | ||
31 | uint32_t size; /* Size of store (4 bytes) */ | ||
32 | }; | ||
33 | |||
34 | static void skip_header(int rpm_fd) | ||
35 | { | ||
36 | struct rpm_header header; | ||
37 | |||
38 | xread(rpm_fd, &header, sizeof(struct rpm_header)); | ||
39 | if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) { | ||
40 | bb_error_msg_and_die("invalid RPM header magic"); /* Invalid magic */ | ||
41 | } | ||
42 | if (header.version != 1) { | ||
43 | bb_error_msg_and_die("unsupported RPM header version"); /* This program only supports v1 headers */ | ||
44 | } | ||
45 | header.entries = ntohl(header.entries); | ||
46 | header.size = ntohl(header.size); | ||
47 | lseek (rpm_fd, 16 * header.entries, SEEK_CUR); /* Seek past index entries */ | ||
48 | lseek (rpm_fd, header.size, SEEK_CUR); /* Seek past store */ | ||
49 | } | ||
50 | |||
51 | /* No getopt required */ | ||
52 | niro | 816 | int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
53 | niro | 532 | int rpm2cpio_main(int argc, char **argv) |
54 | { | ||
55 | struct rpm_lead lead; | ||
56 | int rpm_fd; | ||
57 | unsigned char magic[2]; | ||
58 | |||
59 | if (argc == 1) { | ||
60 | rpm_fd = STDIN_FILENO; | ||
61 | } else { | ||
62 | rpm_fd = xopen(argv[1], O_RDONLY); | ||
63 | } | ||
64 | |||
65 | xread(rpm_fd, &lead, sizeof(struct rpm_lead)); | ||
66 | if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) { | ||
67 | bb_error_msg_and_die("invalid RPM magic"); /* Just check the magic, the rest is irrelevant */ | ||
68 | } | ||
69 | |||
70 | /* Skip the signature header */ | ||
71 | skip_header(rpm_fd); | ||
72 | lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR); | ||
73 | |||
74 | /* Skip the main header */ | ||
75 | skip_header(rpm_fd); | ||
76 | |||
77 | xread(rpm_fd, &magic, 2); | ||
78 | if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) { | ||
79 | bb_error_msg_and_die("invalid gzip magic"); | ||
80 | } | ||
81 | |||
82 | niro | 816 | if (unpack_gz_stream(rpm_fd, STDOUT_FILENO) < 0) { |
83 | niro | 532 | bb_error_msg("error inflating"); |
84 | } | ||
85 | |||
86 | close(rpm_fd); | ||
87 | |||
88 | return 0; | ||
89 | } |