/* 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"struct rpm_lead {    unsigned char magic[4];    u_int8_t major, minor;    u_int16_t type;    u_int16_t archnum;    char name[66];    u_int16_t osnum;    u_int16_t signature_type;    char reserved[16];};struct rpm_header {	char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */	u_int8_t version; /* 1 byte version number */	u_int32_t reserved; /* 4 bytes reserved */	u_int32_t entries; /* Number of entries in header (4 bytes) */	u_int32_t 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 */}/* No getopt required */extern int rpm2cpio_main(int argc, char **argv){	struct rpm_lead lead;	int gunzip_pid;	FILE *rpmfile, *cpiofile;	if (argc == 1) {		rpmfile = stdin;	} else {		rpmfile = fopen(argv[1], "r");	 	if (!rpmfile) perror_msg_and_die("Can't open rpm file");		/* set the buffer size */		setvbuf(rpmfile, NULL, _IOFBF, 0x8000);	}	fread (&lead, sizeof(struct rpm_lead), 1, rpmfile);	if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */	/* Skip the signature header */	skip_header(rpmfile);	fseek(rpmfile, (8 - (ftell(rpmfile) % 8)) % 8, SEEK_CUR); /* Pad to 8 byte boundary */	/* Skip the main header */	skip_header(rpmfile);	cpiofile = gz_open(rpmfile, &gunzip_pid);	copyfd(fileno(cpiofile), fileno(stdout));	gz_close(gunzip_pid);	fclose(rpmfile);	return 0;}