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2009-11-11 Robert Millan <rmh.grub@aybabtu.com>

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Support for El Torito without floppy emulation.

        * util/mkisofs/eltorito.c: Include `<errno.h>'.
        (init_boot_catalog): Improve error handling.
        (get_torito_desc): Don't use floppy emulation unless requested by
        user. Patch boot information table when requested via
        `-boot-info-table'.
        * util/mkisofs/iso9660.h (struct eltorito_boot_info): New struct.
        * util/mkisofs/mkisofs.c (use_eltorito_emul_floppy)
        (use_boot_info_table): New variables.
        (OPTION_BOOT_INFO_TABLE, OPTION_NO_EMUL_BOOT)
        (OPTION_ELTORITO_EMUL_FLOPPY): New macros.
        (ld_options): Handle `-boot-info-table', `-no-emul-boot' and
        `--eltorito-emul-floppy'.
        (main): Handle `OPTION_BOOT_INFO_TABLE', `OPTION_NO_EMUL_BOOT'
        and `OPTION_ELTORITO_EMUL_FLOPPY'.
        * util/mkisofs/mkisofs.h (use_eltorito_emul_floppy)
        (use_boot_info_table, get_731): New prototypes.
        * util/mkisofs/write.c (get_731): New function.
This commit is contained in:
Robert Millan 2009-11-11 20:52:04 +00:00
parent af7d4de5c2
commit e1f240ff44
6 changed files with 148 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

99
util/mkisofs/eltorito.c
View file

@ -6,9 +6,14 @@
Copyright 1996 RedHat Software, Incorporated
Copyright (C) 2009 Free Software Foundation, Inc.
Boot Info Table generation based on code from genisoimage.c
(from cdrkit 1.1.9), which was originally licensed under GPLv2+.
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, or (at your option)
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
@ -17,8 +22,8 @@
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
along with this program; if not, see <http://www.gnu.org/licenses/>.
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
static char rcsid[] ="$Id: eltorito.c,v 1.13 1999/03/02 03:41:25 eric Exp $";
@ -29,6 +34,7 @@ static char rcsid[] ="$Id: eltorito.c,v 1.13 1999/03/02 03:41:25 eric Exp $";
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include "config.h"
#include "mkisofs.h"
@ -103,12 +109,8 @@ void FDECL1(init_boot_catalog, const char *, path)
* make it one CD sector long
*/
bcat = open(bootpath, O_WRONLY | O_CREAT | O_BINARY, S_IROTH | S_IRGRP | S_IRWXU );
if (bcat == -1)
{
fprintf(stderr, "Error creating boot catalog, exiting...\n");
perror("");
exit(1);
}
if (bcat == -1)
error (1, errno, "Error creating boot catalog (%s)", bootpath);
buf = (char *) e_malloc( 2048 );
write(bcat, buf, 2048);
@ -217,31 +219,35 @@ void FDECL1(get_torito_desc, struct eltorito_boot_descriptor *, boot_desc)
*/
nsectors = ((de->size + 511) & ~(511))/512;
fprintf(stderr, "\nSize of boot image is %d sectors -> ", nsectors);
/*
* choose size of emulated floppy based on boot image size
*/
if (nsectors == 2880 )
{
if (! use_eltorito_emul_floppy)
{
default_desc.boot_media[0] = EL_TORITO_MEDIA_NOEMUL;
fprintf (stderr, "No emulation\n");
}
else if (nsectors == 2880 )
/*
* choose size of emulated floppy based on boot image size
*/
{
default_desc.boot_media[0] = EL_TORITO_MEDIA_144FLOP;
fprintf(stderr, "Emulating a 1.44 meg floppy\n");
}
}
else if (nsectors == 5760 )
{
{
default_desc.boot_media[0] = EL_TORITO_MEDIA_288FLOP;
fprintf(stderr,"Emulating a 2.88 meg floppy\n");
}
}
else if (nsectors == 2400 )
{
{
default_desc.boot_media[0] = EL_TORITO_MEDIA_12FLOP;
fprintf(stderr,"Emulating a 1.2 meg floppy\n");
}
}
else
{
{
fprintf(stderr,"\nError - boot image is not the an allowable size.\n");
exit(1);
}
}
/*
* FOR NOW LOAD 1 SECTOR, JUST LIKE FLOPPY BOOT!!!
@ -271,6 +277,53 @@ void FDECL1(get_torito_desc, struct eltorito_boot_descriptor *, boot_desc)
write(bootcat, &valid_desc, 32);
write(bootcat, &default_desc, 32);
close(bootcat);
/* If the user has asked for it, patch the boot image */
if (use_boot_info_table)
{
int bootimage;
uint32_t bi_checksum;
unsigned int total_len;
static char csum_buffer[SECTOR_SIZE];
int len;
struct eltorito_boot_info bi_table;
bootimage = open (de->whole_name, O_RDWR | O_BINARY);
if (bootimage == -1)
error (1, errno, "Error opening boot image file '%s' for update",
de->whole_name);
/* Compute checksum of boot image, sans 64 bytes */
total_len = 0;
bi_checksum = 0;
while ((len = read (bootimage, csum_buffer, SECTOR_SIZE)) > 0)
{
if (total_len & 3)
error (1, 0, "Odd alignment at non-end-of-file in boot image '%s'",
de->whole_name);
if (total_len < 64)
memset (csum_buffer, 0, 64 - total_len);
if (len < SECTOR_SIZE)
memset (csum_buffer + len, 0, SECTOR_SIZE - len);
for (i = 0; i < SECTOR_SIZE; i += 4)
bi_checksum += get_731 (&csum_buffer[i]);
total_len += len;
}
if (total_len != de->size)
error (1, 0, "Boot image file '%s' changed underneath us",
de->whole_name);
/* End of file, set position to byte 8 */
lseek (bootimage, (off_t) 8, SEEK_SET);
memset (&bi_table, 0, sizeof (bi_table));
/* Is it always safe to assume PVD is at session_start+16? */
set_731 (bi_table.pvd_addr, session_start + 16);
set_731 (bi_table.file_addr, de->starting_block);
set_731 (bi_table.file_length, de->size);
set_731 (bi_table.file_checksum, bi_checksum);
write (bootimage, &bi_table, sizeof (bi_table)); /* FIXME: check return value */
close (bootimage);
}
} /* get_torito_desc(... */
/*