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/*
File: alignio.h
Copyright (C) 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.
*/
#ifndef _ALIGNIO_H
#define _ALIGNIO_H
/*@
@ requires \valid_function(fnct_pread);
@ requires \valid(disk_car);
@ requires valid_disk(disk_car);
@ requires disk_car->sector_size > 0;
@ requires disk_car->offset < 0x8000000000000000;
@ requires 0 < count < 0x8000000000000000;
@ requires offset < 0x8000000000000000;
@ requires \valid((char *)buf + (0 .. count -1));
@ requires \separated(disk_car, (char *)buf);
@ decreases 0;
@ ensures valid_disk(disk_car);
@*/
static int align_pread(int (*fnct_pread)(const disk_t *disk_car, void *buf, const unsigned int count, const uint64_t offset),
disk_t *disk_car, void*buf, const unsigned int count, const uint64_t offset)
{
const uint64_t offset_new=offset+disk_car->offset;
const unsigned int count_new=((offset_new%disk_car->sector_size)+count+disk_car->sector_size-1)/disk_car->sector_size*disk_car->sector_size;
/*@ assert count_new >= count; */
/*@ assert count_new >= disk_car->sector_size; */
/*@ assert count_new > 0; */
if(count!=count_new ||
((disk_car->access_mode&TESTDISK_O_DIRECT)!=0 &&
(((size_t)(buf) & (disk_car->sector_size-1))!=0) &&
(buf!=disk_car->rbuffer || disk_car->rbuffer_size<count_new))
)
{
int res;
if(disk_car->rbuffer_size < count_new)
{
free(disk_car->rbuffer);
disk_car->rbuffer=NULL;
}
if(disk_car->rbuffer==NULL)
{
disk_car->rbuffer_size=128*512;
/*@ loop assigns disk_car->rbuffer_size; */
while(disk_car->rbuffer_size < count_new)
{
disk_car->rbuffer_size*=2;
}
/*@ assert disk_car->rbuffer_size >= count_new; */
disk_car->rbuffer=(char*)MALLOC(disk_car->rbuffer_size);
/*@ assert valid_disk(disk_car); */
}
/*@ assert \freeable(disk_car->rbuffer); */
/*@ assert valid_disk(disk_car); */
res=fnct_pread(disk_car, disk_car->rbuffer, count_new, offset_new/disk_car->sector_size*disk_car->sector_size);
memcpy(buf,(char*)disk_car->rbuffer+(offset_new%disk_car->sector_size),count);
/*@ assert \freeable(disk_car->rbuffer) && disk_car->rbuffer_size > 0; */
/*@ assert valid_disk(disk_car); */
return (res < (signed)count ? res : (signed)count );
}
/*@ assert valid_disk(disk_car); */
return fnct_pread(disk_car, buf, count, offset_new);
}
/*@
@ requires \valid_function(fnct_pread);
@ requires \valid_function(fnct_pwrite);
@ requires \valid(disk_car);
@ requires valid_disk(disk_car);
@ requires disk_car->sector_size > 0;
@ requires disk_car->offset < 0x8000000000000000;
@ requires 0 < count < 0x8000000000000000;
@ requires offset < 0x8000000000000000;
@ requires \valid_read((char *)buf + (0 .. count -1));
@ requires \separated(disk_car, (char *)buf);
@ decreases 0;
@ ensures valid_disk(disk_car);
@*/
static int align_pwrite(int (*fnct_pread)(const disk_t *disk_car, void *buf, const unsigned int count, const uint64_t offset),
int (*fnct_pwrite)(disk_t *disk_car, const void *buf, const unsigned int count, const uint64_t offset),
disk_t *disk_car, const void*buf, const unsigned int count, const uint64_t offset)
{
const uint64_t offset_new=offset+disk_car->offset;
const unsigned int count_new=((offset_new%disk_car->sector_size)+count+disk_car->sector_size-1)/disk_car->sector_size*disk_car->sector_size;
if(count!=count_new ||
((disk_car->access_mode&TESTDISK_O_DIRECT)!=0 &&
(((size_t)(buf) & (disk_car->sector_size-1))!=0))
)
{
int tmp;
if(disk_car->wbuffer_size < count_new)
{
free(disk_car->wbuffer);
disk_car->wbuffer=NULL;
}
if(disk_car->wbuffer==NULL)
{
disk_car->wbuffer_size=128*512;
/*@ loop assigns disk_car->wbuffer_size; */
while(disk_car->wbuffer_size < count_new)
{
disk_car->wbuffer_size*=2;
}
/*@ assert disk_car->wbuffer_size >= count_new; */
disk_car->wbuffer=(char*)MALLOC(disk_car->wbuffer_size);
/*@ assert valid_disk(disk_car); */
}
/*@ assert \freeable(disk_car->wbuffer); */
/*@ assert valid_disk(disk_car); */
if(fnct_pread(disk_car, disk_car->wbuffer, count_new, offset_new/disk_car->sector_size*disk_car->sector_size)<0)
{
log_error("read failed but trying to write anyway");
memset(disk_car->wbuffer,0, disk_car->wbuffer_size);
}
memcpy((char*)disk_car->wbuffer+(offset_new%disk_car->sector_size),buf,count);
tmp=fnct_pwrite(disk_car, disk_car->wbuffer, count_new, offset_new/disk_car->sector_size*disk_car->sector_size);
/*@ assert \freeable(disk_car->wbuffer) && disk_car->wbuffer_size > 0; */
/*@ assert valid_disk(disk_car); */
return (tmp < (signed)count ? tmp : (signed)count);
}
/*@ assert valid_disk(disk_car); */
return fnct_pwrite(disk_car, buf, count, offset_new);
}
#endif
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