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/*
File: next.c
Copyright (C) 2007 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.
*/
/*
Instead of incrementing the sector number by one and checking if its value
is aligned to a cylinder (PC) or similar boundary, return the next
sector number that will be aligned to such boundary.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "types.h"
#include "common.h"
#include "ext2_common.h"
#include "next.h"
extern const arch_fnct_t arch_i386;
extern const arch_fnct_t arch_mac;
extern const arch_fnct_t arch_none;
extern const arch_fnct_t arch_sun;
struct search_location
{
uint64_t offset;
uint64_t inc;
};
typedef struct search_location search_location_t;
static inline uint64_t CHS_to_offset(const unsigned int C, const int H, const int S,const disk_t *disk_car);
#define SEARCH_LOCATION_MAX 256
static unsigned int search_location_nbr=0;
static search_location_t search_location_info[SEARCH_LOCATION_MAX+1];
static inline uint64_t CHS_to_offset(const unsigned int C, const int H, const int S,const disk_t *disk_car)
{
return (((uint64_t)C * disk_car->geom.heads_per_cylinder + H) * disk_car->geom.sectors_per_head +(S>0?S-1:S))*disk_car->sector_size;
}
static void update_location(void)
{
unsigned int i;
const search_location_t *src=&search_location_info[search_location_nbr];
if(src->inc==0)
{
for(i=0; i<search_location_nbr; i++)
{
if(search_location_info[i].offset == src->offset)
return ;
}
if(search_location_nbr < SEARCH_LOCATION_MAX)
search_location_nbr++;
return;
}
for(i=0; i<search_location_nbr; i++)
{
search_location_t *cur=&search_location_info[i];
if(cur->offset == src->offset &&
cur->inc >= src->inc &&
cur->inc % src->inc==0)
{
cur->inc=src->inc;
return ;
}
if(cur->inc == 0)
{
if(cur->offset == src->offset)
{
cur->inc = src->inc;
return ;
}
}
else
{
if(cur->offset == src->offset &&
src->inc >= cur->inc && src->inc % cur->inc==0)
return ;
if(cur->inc==src->inc &&
cur->offset >= src->offset &&
(cur->offset - src->offset)%cur->inc==0)
{
cur->offset=src->offset;
return ;
}
if(cur->inc==src->inc &&
src->offset >= cur->offset &&
(src->offset - cur->offset)%cur->inc==0)
return ;
}
}
if(search_location_nbr < SEARCH_LOCATION_MAX)
search_location_nbr++;
}
void search_location_init(const disk_t *disk_car, const unsigned int location_boundary, const int fast_mode)
{
/* test_nbr==1... */
if(disk_car->arch==&arch_i386)
{
if(fast_mode>1)
{
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,1,disk_car);
search_location_info[search_location_nbr].inc= CHS_to_offset(0,1,0,disk_car);
update_location();
}
else
{
//CHS H=0,1,2 S=1
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,1,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
search_location_info[search_location_nbr].offset=CHS_to_offset(0,1,1,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
search_location_info[search_location_nbr].offset=CHS_to_offset(0,2,1,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
}
search_location_info[search_location_nbr].offset=0;
search_location_info[search_location_nbr].inc=2048*512;
update_location();
}
else
{
search_location_info[search_location_nbr].offset=0;
search_location_info[search_location_nbr].inc=location_boundary;
update_location();
}
if(fast_mode>0)
{
/* test_nbr==2 FAT32 backup boot sector */
if(disk_car->arch==&arch_i386)
{
//CHS H=0,1,2 S=7
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,7,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
search_location_info[search_location_nbr].offset=CHS_to_offset(0,1,7,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
search_location_info[search_location_nbr].offset=CHS_to_offset(0,2,7,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
}
else
{
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,7,disk_car);
search_location_info[search_location_nbr].inc=location_boundary;
update_location();
}
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,7,disk_car);
search_location_info[search_location_nbr].inc=2048*512;
update_location();
/* test_nbr==3 ou test_nbr==4, NTFS or HFS backup boot sector */
if(disk_car->arch==&arch_i386)
{
search_location_info[search_location_nbr].offset=CHS_to_offset(1,0,-1,disk_car);
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
}
else
{
search_location_info[search_location_nbr].offset=location_boundary-512;
search_location_info[search_location_nbr].inc=location_boundary;
update_location();
}
search_location_info[search_location_nbr].offset=(2048-1)*512;
search_location_info[search_location_nbr].inc=2048*512;
update_location();
/* test_nbr==5*/
{
int s_log_block_size;
for(s_log_block_size=0;s_log_block_size<=2;s_log_block_size++)
{
const uint64_t hd_offset=3*(EXT2_MIN_BLOCK_SIZE<<s_log_block_size)*8*(EXT2_MIN_BLOCK_SIZE<<s_log_block_size)+(s_log_block_size==0?2*DEFAULT_SECTOR_SIZE:0);
if(disk_car->arch==&arch_i386)
{
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,1,disk_car)+hd_offset;
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
search_location_info[search_location_nbr].offset=CHS_to_offset(0,1,1,disk_car)+hd_offset;
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
search_location_info[search_location_nbr].offset=CHS_to_offset(0,2,1,disk_car)+hd_offset;
search_location_info[search_location_nbr].inc=CHS_to_offset(1,0,0,disk_car);
update_location();
}
else
{
search_location_info[search_location_nbr].offset=CHS_to_offset(0,0,1,disk_car)+hd_offset;
search_location_info[search_location_nbr].inc=location_boundary;
update_location();
}
}
}
}
}
uint64_t search_location_update(const uint64_t location)
{
unsigned int i;
uint64_t min=(uint64_t)-1;
for(i=0;i<search_location_nbr;i++)
{
while(search_location_info[i].offset<=location)
search_location_info[i].offset+=search_location_info[i].inc;
if(min>search_location_info[i].offset)
min=search_location_info[i].offset;
}
return min;
}
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