diff options
Diffstat (limited to 'archival')
-rw-r--r-- | archival/rpm2cpio.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/archival/rpm2cpio.c b/archival/rpm2cpio.c new file mode 100644 index 0000000..8d4ca84 --- /dev/null +++ b/archival/rpm2cpio.c @@ -0,0 +1,92 @@ +/* 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 */ +} + +/* 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"); + } + + 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; +} |