Contents of /tags/mkinitrd-6_1_11/busybox/archival/rpm2cpio.c
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Wed Oct 28 13:31:19 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 2313 byte(s)
Wed Oct 28 13:31:19 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 2313 byte(s)
tagged 'mkinitrd-6_1_11'
1 | /* 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 | #include "libbb.h" |
10 | #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 | 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 | }; |
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 | int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
53 | 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 | if (unpack_gz_stream(rpm_fd, STDOUT_FILENO) < 0) { |
83 | bb_error_msg("error inflating"); |
84 | } |
85 | |
86 | close(rpm_fd); |
87 | |
88 | return 0; |
89 | } |