mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 16:31:24 +00:00
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini rpm2cpio implementation for busybox
|
|
*
|
|
* Copyright (C) 2001 by Laurence Anderson
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
#include "libbb.h"
|
|
#include "archive.h"
|
|
#include "rpm.h"
|
|
|
|
enum { rpm_fd = STDIN_FILENO };
|
|
|
|
static unsigned skip_header(void)
|
|
{
|
|
struct rpm_header header;
|
|
unsigned len;
|
|
|
|
xread(rpm_fd, &header, sizeof(header));
|
|
// if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
|
|
// bb_error_msg_and_die("invalid RPM header magic");
|
|
// }
|
|
// if (header.version != 1) {
|
|
// bb_error_msg_and_die("unsupported RPM header version");
|
|
// }
|
|
if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
|
|
bb_error_msg_and_die("invalid RPM header magic or unsupported version");
|
|
// ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
|
|
}
|
|
|
|
/* Seek past index entries, and past store */
|
|
len = 16 * ntohl(header.entries) + ntohl(header.size);
|
|
seek_by_jump(rpm_fd, len);
|
|
|
|
return sizeof(header) + len;
|
|
}
|
|
|
|
/* No getopt required */
|
|
int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct rpm_lead lead;
|
|
unsigned pos;
|
|
|
|
if (argv[1]) {
|
|
xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
|
|
}
|
|
xread(rpm_fd, &lead, sizeof(lead));
|
|
|
|
/* Just check the magic, the rest is irrelevant */
|
|
if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
|
|
bb_error_msg_and_die("invalid RPM magic");
|
|
}
|
|
|
|
/* Skip the signature header, align to 8 bytes */
|
|
pos = skip_header();
|
|
seek_by_jump(rpm_fd, (-(int)pos) & 7);
|
|
|
|
/* Skip the main header */
|
|
skip_header();
|
|
|
|
#if 0
|
|
/* This works, but doesn't report uncompress errors (they happen in child) */
|
|
setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/);
|
|
if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
|
|
bb_error_msg_and_die("error unpacking");
|
|
#else
|
|
/* BLOAT */
|
|
{
|
|
union {
|
|
uint8_t b[4];
|
|
uint16_t b16[2];
|
|
uint32_t b32[1];
|
|
} magic;
|
|
IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
|
|
|
|
xread(rpm_fd, magic.b16, sizeof(magic.b16[0]));
|
|
if (magic.b16[0] == GZIP_MAGIC) {
|
|
unpack = unpack_gz_stream;
|
|
} else
|
|
if (ENABLE_FEATURE_SEAMLESS_BZ2
|
|
&& magic.b16[0] == BZIP2_MAGIC
|
|
) {
|
|
unpack = unpack_bz2_stream;
|
|
} else
|
|
if (ENABLE_FEATURE_SEAMLESS_XZ
|
|
&& magic.b16[0] == XZ_MAGIC1
|
|
) {
|
|
xread(rpm_fd, magic.b32, sizeof(magic.b32[0]));
|
|
if (magic.b32[0] != XZ_MAGIC2)
|
|
goto no_magic;
|
|
/* unpack_xz_stream wants fd at position 6, no need to seek */
|
|
//xlseek(rpm_fd, -6, SEEK_CUR);
|
|
unpack = unpack_xz_stream;
|
|
} else {
|
|
no_magic:
|
|
bb_error_msg_and_die("no gzip"
|
|
IF_FEATURE_SEAMLESS_BZ2("/bzip2")
|
|
IF_FEATURE_SEAMLESS_XZ("/xz")
|
|
" magic");
|
|
}
|
|
if (unpack(rpm_fd, STDOUT_FILENO) < 0)
|
|
bb_error_msg_and_die("error unpacking");
|
|
}
|
|
#endif
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
close(rpm_fd);
|
|
}
|
|
|
|
return 0;
|
|
}
|