1 /* vi: set sw=4 ts=4: */
3 * Mini rpm2cpio implementation for busybox
5 * Copyright (C) 2001 by Laurence Anderson
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //usage:#define rpm2cpio_trivial_usage
11 //usage: "package.rpm"
12 //usage:#define rpm2cpio_full_usage "\n\n"
13 //usage: "Output a cpio archive of the rpm file"
19 enum { rpm_fd = STDIN_FILENO };
21 static unsigned skip_header(void)
23 struct rpm_header header;
26 xread(rpm_fd, &header, sizeof(header));
27 // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
28 // bb_error_msg_and_die("invalid RPM header magic");
30 // if (header.version != 1) {
31 // bb_error_msg_and_die("unsupported RPM header version");
33 if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
34 bb_error_msg_and_die("invalid RPM header magic or unsupported version");
35 // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
38 /* Seek past index entries, and past store */
39 len = 16 * ntohl(header.entries) + ntohl(header.size);
40 seek_by_jump(rpm_fd, len);
42 return sizeof(header) + len;
45 /* No getopt required */
46 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
47 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
53 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
55 xread(rpm_fd, &lead, sizeof(lead));
57 /* Just check the magic, the rest is irrelevant */
58 if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
59 bb_error_msg_and_die("invalid RPM magic");
62 /* Skip the signature header, align to 8 bytes */
64 seek_by_jump(rpm_fd, (-(int)pos) & 7);
66 /* Skip the main header */
70 /* This works, but doesn't report uncompress errors (they happen in child) */
71 setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/);
72 if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
73 bb_error_msg_and_die("error unpacking");
82 IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
84 xread(rpm_fd, magic.b16, sizeof(magic.b16[0]));
85 if (magic.b16[0] == GZIP_MAGIC) {
86 unpack = unpack_gz_stream;
88 if (ENABLE_FEATURE_SEAMLESS_BZ2
89 && magic.b16[0] == BZIP2_MAGIC
91 unpack = unpack_bz2_stream;
93 if (ENABLE_FEATURE_SEAMLESS_XZ
94 && magic.b16[0] == XZ_MAGIC1
96 xread(rpm_fd, magic.b32, sizeof(magic.b32[0]));
97 if (magic.b32[0] != XZ_MAGIC2)
99 /* unpack_xz_stream wants fd at position 6, no need to seek */
100 //xlseek(rpm_fd, -6, SEEK_CUR);
101 unpack = unpack_xz_stream;
104 bb_error_msg_and_die("no gzip"
105 IF_FEATURE_SEAMLESS_BZ2("/bzip2")
106 IF_FEATURE_SEAMLESS_XZ("/xz")
109 if (unpack(rpm_fd, STDOUT_FILENO) < 0)
110 bb_error_msg_and_die("error unpacking");
114 if (ENABLE_FEATURE_CLEAN_UP) {