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Robert Millan
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265
util/mkisofs/eltorito.c
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265
util/mkisofs/eltorito.c
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/*
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* Program eltorito.c - Handle El Torito specific extensions to iso9660.
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*
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Written by Michael Fulbright <msf@redhat.com> (1996).
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Copyright 1996 RedHat Software, Incorporated
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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, or (at your option)
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any later version.
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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
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GNU General Public License for more details.
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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static char rcsid[] ="$Id: eltorito.c,v 1.7 1997/05/17 15:44:31 eric Exp $";
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include "mkisofs.h"
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#include "iso9660.h"
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#undef MIN
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#define MIN(a, b) (((a) < (b))? (a): (b))
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static struct eltorito_validation_entry valid_desc;
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static struct eltorito_defaultboot_entry default_desc;
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/*
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* Check for presence of boot catalog. If it does not exist then make it
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*/
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void FDECL1(init_boot_catalog, const char *, path)
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{
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int bcat;
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char * bootpath; /* filename of boot catalog */
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char * buf;
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struct stat statbuf;
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bootpath = (char *) e_malloc(strlen(boot_catalog)+strlen(path)+2);
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strcpy(bootpath, path);
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if (bootpath[strlen(bootpath)-1] != '/')
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{
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strcat(bootpath,"/");
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}
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strcat(bootpath, boot_catalog);
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/*
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* check for the file existing
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*/
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#ifdef DEBUG_TORITO
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printf("Looking for boot catalog file %s\n",bootpath);
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#endif
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if (!stat_filter(bootpath, &statbuf))
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{
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/*
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* make sure its big enough to hold what we want
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*/
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if (statbuf.st_size == 2048)
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{
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/*
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* printf("Boot catalog exists, so we do nothing\n");
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*/
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free(bootpath);
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return;
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}
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else
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{
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fprintf(stderr, "A boot catalog exists and appears corrupted.\n");
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fprintf(stderr, "Please check the following file: %s.\n",bootpath);
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fprintf(stderr, "This file must be removed before a bootable CD can be done.\n");
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free(bootpath);
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exit(1);
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}
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}
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/*
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* file does not exist, so we create it
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* make it one CD sector long
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*/
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bcat = open(bootpath, O_WRONLY | O_CREAT, S_IROTH | S_IRGRP | S_IRWXU );
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if (bcat == -1)
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{
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fprintf(stderr, "Error creating boot catalog, exiting...\n");
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perror("");
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exit(1);
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}
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buf = (char *) e_malloc( 2048 );
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write(bcat, buf, 2048);
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close(bcat);
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free(bootpath);
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} /* init_boot_catalog(... */
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void FDECL1(get_torito_desc, struct eltorito_boot_descriptor *, boot_desc)
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{
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int bootcat;
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int checksum;
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unsigned char * checksum_ptr;
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struct directory_entry * de;
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struct directory_entry * de2;
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int i;
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int nsectors;
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memset(boot_desc, 0, sizeof(*boot_desc));
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boot_desc->id[0] = 0;
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memcpy(boot_desc->id2, ISO_STANDARD_ID, sizeof(ISO_STANDARD_ID));
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boot_desc->version[0] = 1;
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memcpy(boot_desc->system_id, EL_TORITO_ID, sizeof(EL_TORITO_ID));
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/*
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* search from root of iso fs to find boot catalog
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*/
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de2 = search_tree_file(root, boot_catalog);
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if (!de2)
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{
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fprintf(stderr,"Uh oh, I cant find the boot catalog!\n");
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exit(1);
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}
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set_731(boot_desc->bootcat_ptr,
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(unsigned int) get_733(de2->isorec.extent));
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/*
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* now adjust boot catalog
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* lets find boot image first
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*/
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de=search_tree_file(root, boot_image);
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if (!de)
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{
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fprintf(stderr,"Uh oh, I cant find the boot image!\n");
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exit(1);
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}
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/*
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* we have the boot image, so write boot catalog information
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* Next we write out the primary descriptor for the disc
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*/
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memset(&valid_desc, 0, sizeof(valid_desc));
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valid_desc.headerid[0] = 1;
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valid_desc.arch[0] = EL_TORITO_ARCH_x86;
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/*
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* we'll shove start of publisher id into id field, may get truncated
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* but who really reads this stuff!
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*/
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if (publisher)
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memcpy_max(valid_desc.id, publisher, MIN(23, strlen(publisher)));
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valid_desc.key1[0] = 0x55;
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valid_desc.key2[0] = 0xAA;
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/*
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* compute the checksum
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*/
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checksum=0;
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checksum_ptr = (unsigned char *) &valid_desc;
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for (i=0; i<sizeof(valid_desc); i+=2)
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{
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/*
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* skip adding in ckecksum word, since we dont have it yet!
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*/
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if (i == 28)
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{
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continue;
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}
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checksum += (unsigned int)checksum_ptr[i];
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checksum += ((unsigned int)checksum_ptr[i+1])*256;
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}
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/*
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* now find out the real checksum
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*/
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checksum = -checksum;
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set_721(valid_desc.cksum, (unsigned int) checksum);
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/*
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* now make the initial/default entry for boot catalog
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*/
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memset(&default_desc, 0, sizeof(default_desc));
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default_desc.boot_id[0] = EL_TORITO_BOOTABLE;
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/*
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* use default BIOS loadpnt
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*/
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set_721(default_desc.loadseg, 0);
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default_desc.arch[0] = EL_TORITO_ARCH_x86;
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/*
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* figure out size of boot image in sectors, for now hard code to
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* assume 512 bytes/sector on a bootable floppy
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*/
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nsectors = ((de->size + 511) & ~(511))/512;
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printf("\nSize of boot image is %d sectors -> ", nsectors);
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/*
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* choose size of emulated floppy based on boot image size
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*/
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if (nsectors == 2880 )
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{
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default_desc.boot_media[0] = EL_TORITO_MEDIA_144FLOP;
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printf("Emulating a 1.44 meg floppy\n");
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}
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else if (nsectors == 5760 )
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{
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default_desc.boot_media[0] = EL_TORITO_MEDIA_288FLOP;
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printf("Emulating a 2.88 meg floppy\n");
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}
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else if (nsectors == 2400 )
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{
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default_desc.boot_media[0] = EL_TORITO_MEDIA_12FLOP;
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printf("Emulating a 1.2 meg floppy\n");
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}
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else
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{
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fprintf(stderr,"\nError - boot image is not the an allowable size.\n");
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exit(1);
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}
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/*
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* FOR NOW LOAD 1 SECTOR, JUST LIKE FLOPPY BOOT!!!
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*/
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nsectors = 1;
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set_721(default_desc.nsect, (unsigned int) nsectors );
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#ifdef DEBUG_TORITO
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printf("Extent of boot images is %d\n",get_733(de->isorec.extent));
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#endif
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set_731(default_desc.bootoff,
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(unsigned int) get_733(de->isorec.extent));
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/*
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* now write it to disk
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*/
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bootcat = open(de2->whole_name, O_RDWR);
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if (bootcat == -1)
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{
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fprintf(stderr,"Error opening boot catalog for update.\n");
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perror("");
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exit(1);
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}
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/*
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* write out
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*/
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write(bootcat, &valid_desc, 32);
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write(bootcat, &default_desc, 32);
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close(bootcat);
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} /* get_torito_desc(... */
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