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 tarball for details.
10 #include "unarchive.h"
13 enum { rpm_fd = STDIN_FILENO };
15 static unsigned skip_header(void)
17 struct rpm_header header;
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");
24 // if (header.version != 1) {
25 // bb_error_msg_and_die("unsupported RPM header version");
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));
32 /* Seek past index entries, and past store */
33 len = 16 * ntohl(header.entries) + ntohl(header.size);
34 seek_by_jump(rpm_fd, len);
36 return sizeof(header) + len;
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)
47 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
49 xread(rpm_fd, &lead, sizeof(lead));
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");
56 /* Skip the signature header, align to 8 bytes */
58 seek_by_jump(rpm_fd, (-(int)pos) & 7);
60 /* Skip the main header */
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");
71 unsigned char magic[8];
72 IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
74 xread(rpm_fd, &magic, 2);
75 if (magic[0] == 0x1f && magic[1] == 0x8b) {
76 unpack = unpack_gz_stream;
78 if (ENABLE_FEATURE_SEAMLESS_BZ2
79 && magic[0] == 'B' && magic[1] == 'Z'
81 unpack = unpack_bz2_stream;
83 if (ENABLE_FEATURE_SEAMLESS_XZ
84 && magic[0] == 0xfd && magic[1] == '7'
86 /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
87 /* More info at: http://tukaani.org/xz/xz-file-format.txt */
88 xread(rpm_fd, magic + 2, 4);
89 if (strcmp((char*)magic + 2, "zXZ") != 0)
91 xlseek(rpm_fd, -6, SEEK_CUR);
92 unpack = unpack_xz_stream;
95 bb_error_msg_and_die("no gzip"
96 IF_FEATURE_SEAMLESS_BZ2("/bzip2")
97 IF_FEATURE_SEAMLESS_XZ("/xz")
100 if (unpack(rpm_fd, STDOUT_FILENO) < 0)
101 bb_error_msg_and_die("error unpacking");
105 if (ENABLE_FEATURE_CLEAN_UP) {