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

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    Revision 1123 - (show 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 /* 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 #include "rpm.h"
    12
    13 enum { rpm_fd = STDIN_FILENO };
    14
    15 static unsigned skip_header(void)
    16 {
    17 struct rpm_header header;
    18 unsigned len;
    19
    20 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 }
    31
    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 }
    38
    39 /* No getopt required */
    40 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    41 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
    42 {
    43 struct rpm_lead lead;
    44 unsigned pos;
    45
    46 if (argv[1]) {
    47 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
    48 }
    49 xread(rpm_fd, &lead, sizeof(lead));
    50
    51 /* Just check the magic, the rest is irrelevant */
    52 if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
    53 bb_error_msg_and_die("invalid RPM magic");
    54 }
    55
    56 /* Skip the signature header, align to 8 bytes */
    57 pos = skip_header();
    58 seek_by_jump(rpm_fd, (-(int)pos) & 7);
    59
    60 /* Skip the main header */
    61 skip_header();
    62
    63 #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 ) {
    85 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 IF_FEATURE_SEAMLESS_BZ2("/bzip2")
    100 IF_FEATURE_SEAMLESS_XZ("/xz")
    101 " magic");
    102 }
    103 if (unpack(rpm_fd, STDOUT_FILENO) < 0)
    104 bb_error_msg_and_die("error unpacking");
    105 }
    106 #endif
    107
    108 if (ENABLE_FEATURE_CLEAN_UP) {
    109 close(rpm_fd);
    110 }
    111
    112 return 0;
    113 }