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92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini rpm2cpio implementation for busybox
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*
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* Copyright (C) 2001 by Laurence Anderson
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "busybox.h"
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#include <netinet/in.h> /* For ntohl & htonl function */
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#include <string.h>
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#define RPM_MAGIC "\355\253\356\333"
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#define RPM_HEADER_MAGIC "\216\255\350"
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struct rpm_lead {
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unsigned char magic[4];
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u_int8_t major, minor;
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u_int16_t type;
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u_int16_t archnum;
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char name[66];
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u_int16_t osnum;
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u_int16_t signature_type;
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char reserved[16];
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};
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struct rpm_header {
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char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
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u_int8_t version; /* 1 byte version number */
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u_int32_t reserved; /* 4 bytes reserved */
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u_int32_t entries; /* Number of entries in header (4 bytes) */
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u_int32_t size; /* Size of store (4 bytes) */
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};
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void skip_header(FILE *rpmfile)
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{
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struct rpm_header header;
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fread(&header, sizeof(struct rpm_header), 1, rpmfile);
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if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0) error_msg_and_die("Invalid RPM header magic"); /* Invalid magic */
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if (header.version != 1) error_msg_and_die("Unsupported RPM header version"); /* This program only supports v1 headers */
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header.entries = ntohl(header.entries);
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header.size = ntohl(header.size);
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fseek (rpmfile, 16 * header.entries, SEEK_CUR); /* Seek past index entries */
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fseek (rpmfile, header.size, SEEK_CUR); /* Seek past store */
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}
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/* No getopt required */
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extern int rpm2cpio_main(int argc, char **argv)
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{
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struct rpm_lead lead;
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int gunzip_pid;
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FILE *rpmfile, *cpiofile;
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if (argc == 1) {
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rpmfile = stdin;
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} else {
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rpmfile = fopen(argv[1], "r");
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if (!rpmfile) perror_msg_and_die("Can't open rpm file");
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/* set the buffer size */
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setvbuf(rpmfile, NULL, _IOFBF, 0x8000);
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}
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fread (&lead, sizeof(struct rpm_lead), 1, rpmfile);
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if (strncmp((char *) &lead.magic, RPM_MAGIC, 4) != 0) error_msg_and_die("Invalid RPM magic"); /* Just check the magic, the rest is irrelevant */
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/* Skip the signature header */
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skip_header(rpmfile);
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fseek(rpmfile, (8 - (ftell(rpmfile) % 8)) % 8, SEEK_CUR); /* Pad to 8 byte boundary */
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/* Skip the main header */
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skip_header(rpmfile);
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cpiofile = gz_open(rpmfile, &gunzip_pid);
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copyfd(fileno(cpiofile), fileno(stdout));
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gz_close(gunzip_pid);
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fclose(rpmfile);
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return 0;
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}
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