busybox

/* vi: set sw=4 ts=4: */

/*

 * Mini rpm2cpio implementation for busybox

 *

 * Copyright (C) 2001 by Laurence Anderson

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

​

#include "busybox.h"

#include <netinet/in.h> /* For ntohl & htonl function */

#include <string.h>

​

#define RPM_MAGIC "\355\253\356\333"

#define RPM_HEADER_MAGIC "\216\255\350"

​

typedef unsigned char u8;

typedef unsigned short u16;

typedef unsigned int u32;

​

struct rpm_lead {

    unsigned char magic[4];

    u8 major, minor;

    u16 type;

    u16 archnum;

    char name[66];

    u16 osnum;

    u16 signature_type;

    char reserved[16];

};

​

struct rpm_header {

    char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */

    u8 version; /* 1 byte version number */

    u32 reserved; /* 4 bytes reserved */

    u32 entries; /* Number of entries in header (4 bytes) */

    u32 size; /* Size of store (4 bytes) */

};

​

void skip_header(FILE *rpmfile)

{

    struct rpm_header header;

​

    fread(&header, sizeof(struct rpm_header), 1, rpmfile);

    if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */

    if (header.version != 1) error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */

    header.entries = ntohl(header.entries);

    header.size = ntohl(header.size);

    fseek (rpmfile, 16 * header.entries, SEEK_CUR); /* Seek past index entries */

    fseek (rpmfile, header.size, SEEK_CUR); /* Seek past store */

}