| Glenn L McGrath | f8736d2 | 2001-06-26 01:19:34 +0000 | [diff] [blame] | 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 | |
| 29 | typedef unsigned char u8; |
| 30 | typedef unsigned short u16; |
| 31 | typedef unsigned int u32; |
| 32 | |
| 33 | struct 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 | |
| 44 | struct 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 | |
| 52 | void 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 */ |
| 66 | extern 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 | } |
| 78 | |
| 79 | fread (&lead, sizeof(struct rpm_lead), 1, rpmfile); |
| 80 | if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */ |
| 81 | /* Skip the signature header */ |
| 82 | skip_header(rpmfile); |
| 83 | fseek(rpmfile, (8 - (ftell(rpmfile) % 8)) % 8, SEEK_CUR); /* Pad to 8 byte boundary */ |
| 84 | /* Skip the main header */ |
| 85 | skip_header(rpmfile); |
| 86 | |
| 87 | cpiofile = gz_open(rpmfile, &gunzip_pid); |
| 88 | copyfd(fileno(cpiofile), fileno(stdout)); |
| 89 | gz_close(gunzip_pid); |
| 90 | fclose(rpmfile); |
| 91 | return 0; |
| 92 | } |