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    Contents of /trunk/mkinitrd-magellan/busybox/archival/rpm2cpio.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 2756 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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 0xedabeedb
    13 #define RPM_MAGIC_STR "\355\253\356\333"
    14
    15 struct rpm_lead {
    16 uint32_t magic;
    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 #define RPM_HEADER_MAGICnVER 0x8eade801
    27 #define RPM_HEADER_MAGIC_STR "\216\255\350"
    28
    29 struct rpm_header {
    30 uint32_t magic_and_ver; /* 3 byte magic: 0x8e 0xad 0xe8; 1 byte version */
    31 uint32_t reserved; /* 4 bytes reserved */
    32 uint32_t entries; /* Number of entries in header (4 bytes) */
    33 uint32_t size; /* Size of store (4 bytes) */
    34 };
    35
    36 enum { rpm_fd = STDIN_FILENO };
    37
    38 static unsigned skip_header(void)
    39 {
    40 struct rpm_header header;
    41 unsigned len;
    42
    43 xread(rpm_fd, &header, sizeof(header));
    44 // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
    45 // bb_error_msg_and_die("invalid RPM header magic");
    46 // }
    47 // if (header.version != 1) {
    48 // bb_error_msg_and_die("unsupported RPM header version");
    49 // }
    50 if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
    51 bb_error_msg_and_die("invalid RPM header magic or unsupported version");
    52 // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
    53 }
    54
    55 /* Seek past index entries, and past store */
    56 len = 16 * ntohl(header.entries) + ntohl(header.size);
    57 seek_by_jump(rpm_fd, len);
    58
    59 return sizeof(header) + len;
    60 }
    61
    62 /* No getopt required */
    63 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    64 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
    65 {
    66 struct rpm_lead lead;
    67 unsigned pos;
    68 unsigned char magic[2];
    69 IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
    70
    71 if (argv[1]) {
    72 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
    73 }
    74 xread(rpm_fd, &lead, sizeof(lead));
    75
    76 /* Just check the magic, the rest is irrelevant */
    77 if (lead.magic != htonl(RPM_MAGIC)) {
    78 bb_error_msg_and_die("invalid RPM magic");
    79 }
    80
    81 /* Skip the signature header, align to 8 bytes */
    82 pos = skip_header();
    83 seek_by_jump(rpm_fd, (8 - pos) & 7);
    84
    85 /* Skip the main header */
    86 skip_header();
    87
    88 xread(rpm_fd, &magic, 2);
    89 unpack = unpack_gz_stream;
    90 if (magic[0] != 0x1f || magic[1] != 0x8b) {
    91 if (!ENABLE_FEATURE_SEAMLESS_BZ2
    92 || magic[0] != 'B' || magic[1] != 'Z'
    93 ) {
    94 bb_error_msg_and_die("invalid gzip"
    95 IF_FEATURE_SEAMLESS_BZ2("/bzip2")
    96 " magic");
    97 }
    98 unpack = unpack_bz2_stream;
    99 }
    100
    101 if (unpack(rpm_fd, STDOUT_FILENO) < 0) {
    102 bb_error_msg_and_die("error unpacking");
    103 }
    104
    105 if (ENABLE_FEATURE_CLEAN_UP) {
    106 close(rpm_fd);
    107 }
    108
    109 return 0;
    110 }