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

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    Revision 984 - (hide 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 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 niro 984 #define RPM_MAGIC 0xedabeedb
    13     #define RPM_MAGIC_STR "\355\253\356\333"
    14 niro 532
    15     struct rpm_lead {
    16 niro 984 uint32_t magic;
    17 niro 816 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 niro 984 #define RPM_HEADER_MAGICnVER 0x8eade801
    27     #define RPM_HEADER_MAGIC_STR "\216\255\350"
    28    
    29 niro 532 struct rpm_header {
    30 niro 984 uint32_t magic_and_ver; /* 3 byte magic: 0x8e 0xad 0xe8; 1 byte version */
    31 niro 532 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 niro 984 enum { rpm_fd = STDIN_FILENO };
    37    
    38     static unsigned skip_header(void)
    39 niro 532 {
    40     struct rpm_header header;
    41 niro 984 unsigned len;
    42 niro 532
    43 niro 984 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 niro 532 }
    54 niro 984
    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 niro 532 }
    61    
    62     /* No getopt required */
    63 niro 816 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    64 niro 984 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
    65 niro 532 {
    66     struct rpm_lead lead;
    67 niro 984 unsigned pos;
    68 niro 532 unsigned char magic[2];
    69 niro 984 IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
    70 niro 532
    71 niro 984 if (argv[1]) {
    72     xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
    73 niro 532 }
    74 niro 984 xread(rpm_fd, &lead, sizeof(lead));
    75 niro 532
    76 niro 984 /* 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 niro 532 }
    80    
    81 niro 984 /* Skip the signature header, align to 8 bytes */
    82     pos = skip_header();
    83     seek_by_jump(rpm_fd, (8 - pos) & 7);
    84 niro 532
    85     /* Skip the main header */
    86 niro 984 skip_header();
    87 niro 532
    88     xread(rpm_fd, &magic, 2);
    89 niro 984 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 niro 532 }
    100    
    101 niro 984 if (unpack(rpm_fd, STDOUT_FILENO) < 0) {
    102     bb_error_msg_and_die("error unpacking");
    103 niro 532 }
    104    
    105 niro 984 if (ENABLE_FEATURE_CLEAN_UP) {
    106     close(rpm_fd);
    107     }
    108 niro 532
    109     return 0;
    110     }