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/*
File: geometry.c
Copyright (C) 1998-2008 Christophe GRENIER <grenier@cgsecurity.org>
This software 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 the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "types.h"
#include "common.h"
#include "intrf.h"
#include "log.h"
#include "hdaccess.h"
#include "geometry.h"
#include "autoset.h"
#define MAX_HEADS 255
void set_cylinders_from_size_up(disk_t *disk_car)
{
disk_car->geom.cylinders=(disk_car->disk_size / disk_car->sector_size +
(uint64_t)disk_car->geom.sectors_per_head * disk_car->geom.heads_per_cylinder - 1) /
((uint64_t)disk_car->geom.sectors_per_head * disk_car->geom.heads_per_cylinder);
}
int change_sector_size(disk_t *disk, const int cyl_modified, const unsigned int sector_size)
{
/* Using 3*512=1536 as sector size and */
/* 63/3=21 for number of sectors is an easy way to test */
/* MS Backup internal blocksize is 256 bytes */
switch(sector_size)
{
case 1:
case 256:
case 512:
case 1024:
case 3*512:
case 2048:
case 4096:
case 8192:
disk->sector_size = sector_size;
if(cyl_modified==0)
set_cylinders_from_size_up(disk);
return 0;
default:
return 1;
}
}
int change_geometry_cli(disk_t *disk_car, char ** current_cmd)
{
int done = 0;
int tmp_val=0;
int cyl_modified=0;
int geo_modified=0;
if(*current_cmd==NULL)
return 0;
#ifndef DISABLED_FOR_FRAMAC
log_info("Current geometry\n%s sector_size=%u\n", disk_car->description(disk_car), disk_car->sector_size);
#endif
/*@ loop invariant valid_read_string(*current_cmd); */
while (done==0)
{
skip_comma_in_command(current_cmd);
if(check_command(current_cmd,"C,",2)==0)
{
tmp_val = get_int_from_command(current_cmd);
if (tmp_val > 0)
{
disk_car->geom.cylinders = tmp_val;
cyl_modified=1;
if(geo_modified==0)
geo_modified=1;
}
#ifndef DISABLED_FOR_FRAMAC
else
log_error("Illegal cylinders value\n");
#endif
}
else if(check_command(current_cmd,"H,",2)==0)
{
tmp_val = get_int_from_command(current_cmd);
if (tmp_val > 0 && tmp_val <= MAX_HEADS)
{
disk_car->geom.heads_per_cylinder = tmp_val;
if(geo_modified==0)
geo_modified=1;
if(cyl_modified==0)
set_cylinders_from_size_up(disk_car);
}
#ifndef DISABLED_FOR_FRAMAC
else
log_error("Illegal heads value\n");
#endif
}
else if(check_command(current_cmd,"S,",2)==0)
{
tmp_val = get_int_from_command(current_cmd);
/* SUN partition can have more than 63 sectors */
if (tmp_val > 0) {
disk_car->geom.sectors_per_head = tmp_val;
if(geo_modified==0)
geo_modified=1;
if(cyl_modified==0)
set_cylinders_from_size_up(disk_car);
}
#ifndef DISABLED_FOR_FRAMAC
else
log_error("Illegal sectors value\n");
#endif
}
else if(check_command(current_cmd,"N,",2)==0)
{
tmp_val = get_int_from_command(current_cmd);
if(change_sector_size(disk_car, cyl_modified, tmp_val)==0)
geo_modified=2;
#ifndef DISABLED_FOR_FRAMAC
else
log_error("Illegal sector size\n");
#endif
}
else
{
done = 1;
}
if(cyl_modified!=0)
disk_car->disk_size=(uint64_t)disk_car->geom.cylinders*disk_car->geom.heads_per_cylinder*disk_car->geom.sectors_per_head*disk_car->sector_size;
}
/*@ assert valid_read_string(*current_cmd); */
if(geo_modified!=0)
{
disk_car->disk_size=(uint64_t)disk_car->geom.cylinders*disk_car->geom.heads_per_cylinder*disk_car->geom.sectors_per_head*disk_car->sector_size;
#ifdef __APPLE__
/* On MacOSX if HD contains some bad sectors, the disk size may not be correctly detected */
disk_car->disk_real_size=disk_car->disk_size;
#endif
#ifndef DISABLED_FOR_FRAMAC
log_info("New geometry\n%s sector_size=%u\n", disk_car->description(disk_car), disk_car->sector_size);
#endif
autoset_unit(disk_car);
if(geo_modified==2)
{
/*@ assert valid_read_string(*current_cmd); */
return 1;
}
}
/*@ assert valid_read_string(*current_cmd); */
return 0;
}
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