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

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    Revision 1123 - (hide annotations) (download)
    Wed Aug 18 21:56:57 2010 UTC (13 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 2874 byte(s) 
    -updated to busybox-1.17.1
    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 niro 1123 #include "rpm.h"
    12 niro 532
    13 niro 984 enum { rpm_fd = STDIN_FILENO };
    14    
    15     static unsigned skip_header(void)
    16 niro 532 {
    17     struct rpm_header header;
    18 niro 984 unsigned len;
    19 niro 532
    20 niro 984 xread(rpm_fd, &header, sizeof(header));
    21     // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
    22     // bb_error_msg_and_die("invalid RPM header magic");
    23     // }
    24     // if (header.version != 1) {
    25     // bb_error_msg_and_die("unsupported RPM header version");
    26     // }
    27     if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
    28     bb_error_msg_and_die("invalid RPM header magic or unsupported version");
    29     // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
    30 niro 532 }
    31 niro 984
    32     /* Seek past index entries, and past store */
    33     len = 16 * ntohl(header.entries) + ntohl(header.size);
    34     seek_by_jump(rpm_fd, len);
    35    
    36     return sizeof(header) + len;
    37 niro 532 }
    38    
    39     /* No getopt required */
    40 niro 816 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    41 niro 984 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
    42 niro 532 {
    43     struct rpm_lead lead;
    44 niro 984 unsigned pos;
    45 niro 532
    46 niro 984 if (argv[1]) {
    47     xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
    48 niro 532 }
    49 niro 984 xread(rpm_fd, &lead, sizeof(lead));
    50 niro 532
    51 niro 984 /* Just check the magic, the rest is irrelevant */
    52 niro 1123 if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
    53 niro 984 bb_error_msg_and_die("invalid RPM magic");
    54 niro 532 }
    55    
    56 niro 984 /* Skip the signature header, align to 8 bytes */
    57     pos = skip_header();
    58 niro 1123 seek_by_jump(rpm_fd, (-(int)pos) & 7);
    59 niro 532
    60     /* Skip the main header */
    61 niro 984 skip_header();
    62 niro 532
    63 niro 1123 #if 0
    64     /* This works, but doesn't report uncompress errors (they happen in child) */
    65     setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/);
    66     if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
    67     bb_error_msg_and_die("error unpacking");
    68     #else
    69     /* BLOAT */
    70     {
    71     union {
    72     uint8_t b[4];
    73     uint16_t b16[2];
    74     uint32_t b32[1];
    75     } magic;
    76     IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
    77    
    78     xread(rpm_fd, magic.b16, sizeof(magic.b16[0]));
    79     if (magic.b16[0] == GZIP_MAGIC) {
    80     unpack = unpack_gz_stream;
    81     } else
    82     if (ENABLE_FEATURE_SEAMLESS_BZ2
    83     && magic.b16[0] == BZIP2_MAGIC
    84 niro 984 ) {
    85 niro 1123 unpack = unpack_bz2_stream;
    86     } else
    87     if (ENABLE_FEATURE_SEAMLESS_XZ
    88     && magic.b16[0] == XZ_MAGIC1
    89     ) {
    90     xread(rpm_fd, magic.b32, sizeof(magic.b32[0]));
    91     if (magic.b32[0] != XZ_MAGIC2)
    92     goto no_magic;
    93     /* unpack_xz_stream wants fd at position 6, no need to seek */
    94     //xlseek(rpm_fd, -6, SEEK_CUR);
    95     unpack = unpack_xz_stream;
    96     } else {
    97     no_magic:
    98     bb_error_msg_and_die("no gzip"
    99 niro 984 IF_FEATURE_SEAMLESS_BZ2("/bzip2")
    100 niro 1123 IF_FEATURE_SEAMLESS_XZ("/xz")
    101 niro 984 " magic");
    102     }
    103 niro 1123 if (unpack(rpm_fd, STDOUT_FILENO) < 0)
    104     bb_error_msg_and_die("error unpacking");
    105 niro 532 }
    106 niro 1123 #endif
    107 niro 532
    108 niro 984 if (ENABLE_FEATURE_CLEAN_UP) {
    109     close(rpm_fd);
    110     }
    111 niro 532
    112     return 0;
    113     }