1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini rpm2cpio implementation for busybox 4 * 5 * Copyright (C) 2001 by Laurence Anderson 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22#include "busybox.h" 23#include <netinet/in.h> /* For ntohl & htonl function */ 24#include <string.h> 25 26#define RPM_MAGIC "\355\253\356\333" 27#define RPM_HEADER_MAGIC "\216\255\350" 28 29typedef unsigned char u8; 30typedef unsigned short u16; 31typedef unsigned int u32; 32 33struct rpm_lead { 34 unsigned char magic[4]; 35 u8 major, minor; 36 u16 type; 37 u16 archnum; 38 char name[66]; 39 u16 osnum; 40 u16 signature_type; 41 char reserved[16]; 42}; 43 44struct rpm_header { 45 char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */ 46 u8 version; /* 1 byte version number */ 47 u32 reserved; /* 4 bytes reserved */ 48 u32 entries; /* Number of entries in header (4 bytes) */ 49 u32 size; /* Size of store (4 bytes) */ 50}; 51 52void skip_header(FILE *rpmfile) 53{ 54 struct rpm_header header; 55 56 fread(&header, sizeof(struct rpm_header), 1, rpmfile); 57 if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */ 58 if (header.version != 1) error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */ 59 header.entries = ntohl(header.entries); 60 header.size = ntohl(header.size); 61 fseek (rpmfile, 16 * header.entries, SEEK_CUR); /* Seek past index entries */ 62 fseek (rpmfile, header.size, SEEK_CUR); /* Seek past store */ 63} 64 65/* No getopt required */ 66extern int rpm2cpio_main(int argc, char **argv) 67{ 68 struct rpm_lead lead; 69 int gunzip_pid; 70 FILE *rpmfile, *cpiofile; 71 72 if (argc == 1) { 73 rpmfile = stdin; 74 } else { 75 rpmfile = fopen(argv[1], "r"); 76 if (!rpmfile) perror_msg_and_die("Can't open rpm file"); 77 /* set the buffer size */ 78 setvbuf(rpmfile, NULL, _IOFBF, 0x8000); 79 } 80 81 fread (&lead, sizeof(struct rpm_lead), 1, rpmfile); 82 if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */ 83 /* Skip the signature header */ 84 skip_header(rpmfile); 85 fseek(rpmfile, (8 - (ftell(rpmfile) % 8)) % 8, SEEK_CUR); /* Pad to 8 byte boundary */ 86 /* Skip the main header */ 87 skip_header(rpmfile); 88 89 cpiofile = gz_open(rpmfile, &gunzip_pid); 90 91 copyfd(fileno(cpiofile), fileno(stdout)); 92 gz_close(gunzip_pid); 93 fclose(rpmfile); 94 return 0; 95} 96