120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini rpm2cpio implementation for busybox
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*
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* Copyright (C) 2001 by Laurence Anderson
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//usage:#define rpm2cpio_trivial_usage
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//usage: "package.rpm"
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//usage:#define rpm2cpio_full_usage "\n\n"
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//usage: "Output a cpio archive of the rpm file"
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#include "libbb.h"
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#include "bb_archive.h"
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#include "rpm.h"
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enum { rpm_fd = STDIN_FILENO };
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static unsigned skip_header(void)
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{
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struct rpm_header header;
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unsigned len;
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xread(rpm_fd, &header, sizeof(header));
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// if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
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// bb_error_msg_and_die("invalid RPM header magic");
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// }
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// if (header.version != 1) {
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// bb_error_msg_and_die("unsupported RPM header version");
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// }
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if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
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bb_error_msg_and_die("invalid RPM header magic or unsupported version");
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// ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
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}
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/* Seek past index entries, and past store */
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len = 16 * ntohl(header.entries) + ntohl(header.size);
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seek_by_jump(rpm_fd, len);
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return sizeof(header) + len;
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}
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/* No getopt required */
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int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
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{
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struct rpm_lead lead;
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unsigned pos;
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if (argv[1]) {
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xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
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}
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xread(rpm_fd, &lead, sizeof(lead));
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/* Just check the magic, the rest is irrelevant */
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if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
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bb_error_msg_and_die("invalid RPM magic");
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}
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/* Skip the signature header, align to 8 bytes */
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pos = skip_header();
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seek_by_jump(rpm_fd, (-(int)pos) & 7);
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/* Skip the main header */
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skip_header();
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#if 0
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/* This works, but doesn't report uncompress errors (they happen in child) */
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setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/);
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if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
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bb_error_msg_and_die("error unpacking");
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#else
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/* BLOAT */
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{
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union {
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uint8_t b[4];
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uint16_t b16[2];
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uint32_t b32[1];
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} magic;
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IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
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xread(rpm_fd, magic.b16, sizeof(magic.b16[0]));
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if (magic.b16[0] == GZIP_MAGIC) {
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unpack = unpack_gz_stream;
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} else
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if (ENABLE_FEATURE_SEAMLESS_BZ2
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&& magic.b16[0] == BZIP2_MAGIC
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) {
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unpack = unpack_bz2_stream;
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} else
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if (ENABLE_FEATURE_SEAMLESS_XZ
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&& magic.b16[0] == XZ_MAGIC1
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) {
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xread(rpm_fd, magic.b32, sizeof(magic.b32[0]));
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if (magic.b32[0] != XZ_MAGIC2)
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goto no_magic;
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/* unpack_xz_stream wants fd at position 6, no need to seek */
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//xlseek(rpm_fd, -6, SEEK_CUR);
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unpack = unpack_xz_stream;
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} else {
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no_magic:
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bb_error_msg_and_die("no gzip"
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IF_FEATURE_SEAMLESS_BZ2("/bzip2")
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IF_FEATURE_SEAMLESS_XZ("/xz")
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" magic");
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}
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if (unpack(rpm_fd, STDOUT_FILENO) < 0)
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bb_error_msg_and_die("error unpacking");
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}
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#endif
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(rpm_fd);
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}
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return 0;
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}
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