busybox

/* 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