Annotation of /trunk/mkinitrd-magellan/busybox/archival/rpm2cpio.c
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Revision 532 -
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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File size: 2299 byte(s)
Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 2299 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 | #include "busybox.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) | ||
53 | { | ||
54 | struct rpm_lead lead; | ||
55 | int rpm_fd; | ||
56 | unsigned char magic[2]; | ||
57 | |||
58 | if (argc == 1) { | ||
59 | rpm_fd = STDIN_FILENO; | ||
60 | } else { | ||
61 | rpm_fd = xopen(argv[1], O_RDONLY); | ||
62 | } | ||
63 | |||
64 | xread(rpm_fd, &lead, sizeof(struct rpm_lead)); | ||
65 | if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) { | ||
66 | bb_error_msg_and_die("invalid RPM magic"); /* Just check the magic, the rest is irrelevant */ | ||
67 | } | ||
68 | |||
69 | /* Skip the signature header */ | ||
70 | skip_header(rpm_fd); | ||
71 | lseek(rpm_fd, (8 - (lseek(rpm_fd, 0, SEEK_CUR) % 8)) % 8, SEEK_CUR); | ||
72 | |||
73 | /* Skip the main header */ | ||
74 | skip_header(rpm_fd); | ||
75 | |||
76 | xread(rpm_fd, &magic, 2); | ||
77 | if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) { | ||
78 | bb_error_msg_and_die("invalid gzip magic"); | ||
79 | } | ||
80 | |||
81 | check_header_gzip(rpm_fd); | ||
82 | if (inflate_gunzip(rpm_fd, STDOUT_FILENO) < 0) { | ||
83 | bb_error_msg("error inflating"); | ||
84 | } | ||
85 | |||
86 | close(rpm_fd); | ||
87 | |||
88 | return 0; | ||
89 | } |