source: branches/2.2.9/mindi-busybox/archival/rpm2cpio.c @ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 2.8 KB
Line 
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 source tree.
8 */
9#include "libbb.h"
10#include "archive.h"
11#include "rpm.h"
12
13enum { rpm_fd = STDIN_FILENO };
14
15static 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 */
40int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
41int 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}
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