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/*
File: file_fits.c
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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_fits)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#ifdef DEBUG_FITS
#include "log.h"
#endif
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_fits(file_stat_t *file_stat);
const file_hint_t file_hint_fits= {
.extension="fits",
.description="Flexible Image Transport System",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_fits
};
/* FITS is the standard data format used in astronomy, it's also used in quantic physics
* Image metadata is store in an ASCII header
* Specification can be found at http://fits.gsfc.nasa.gov/ */
/*@
@ requires \valid_read(str + (0 .. 80-1));
@ terminates \true;
@ assigns \nothing;
@*/
static uint64_t fits_get_val(const unsigned char *str)
{
unsigned int i;
uint64_t val=0;
/*@
@ loop assigns i;
@ loop variant 80 - i;
@*/
for(i=0;i<80 && str[i]!='=';i++);
i++;
/*@
@ loop assigns i;
@ loop variant 80 - i;
@*/
for(;i<80 && str[i]==' ';i++);
if(i<80 && str[i]=='-')
i++;
/*@
@ loop invariant val < PHOTOREC_MAX_FILE_SIZE;
@ loop assigns i,val;
@ loop variant 80 - i;
@*/
for(;i<80 && str[i]>='0' && str[i]<='9';i++)
{
val=val*10+(str[i]-'0');
if(val >= PHOTOREC_MAX_FILE_SIZE)
return val;
}
return val;
}
/*@
@ requires buffer_size > 0;
@ requires \valid_read(buffer + (0 .. buffer_size-1));
@ requires \valid(file_recovery);
@ requires \valid(i_pointer);
@ requires \separated(buffer+(..), file_recovery, i_pointer);
@ requires *i_pointer < buffer_size;
@ assigns *i_pointer, file_recovery->time;
@ ensures \old(*i_pointer) == *i_pointer || (\old(*i_pointer) <= *i_pointer < buffer_size + 80);
@*/
static uint64_t fits_info(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery, unsigned int *i_pointer)
{
uint64_t naxis_size=1;
unsigned int i=*i_pointer;
if( i+80 >= buffer_size)
return 1;
/*@ assert *i_pointer == i; */
/* Header is composed of 80 character fixed-length strings */
/*@
@ loop invariant *i_pointer <= i;
@ loop invariant i < buffer_size + 80;
@ loop assigns i, naxis_size, file_recovery->time;
@ loop variant buffer_size + 80 - i;
@*/
for(; i+80 < buffer_size &&
memcmp(&buffer[i], "END ", 4)!=0;
i+=80)
{
if(naxis_size > PHOTOREC_MAX_FILE_SIZE)
naxis_size=0;
/*@ assert naxis_size <= PHOTOREC_MAX_FILE_SIZE; */
if(memcmp(&buffer[i], "BITPIX",6)==0)
{
const uint64_t tmp=fits_get_val(&buffer[i]);
if(tmp > PHOTOREC_MAX_FILE_SIZE)
naxis_size=0;
else if(tmp>0)
{ /* FIXME overflow */
naxis_size*=(tmp+8-1)/8;
}
}
else if(memcmp(&buffer[i], "NAXIS ",6)==0)
{
/* NAXIS - range [0:999] */
if(fits_get_val(&buffer[i])==0)
naxis_size=0;
}
else if(memcmp(&buffer[i], "NAXIS",5)==0)
{
/* NAXISn */
const uint64_t naxis_val=fits_get_val(&buffer[i]);
if(naxis_val > PHOTOREC_MAX_FILE_SIZE)
naxis_size=0;
else
{ /* FIXME overflow */
naxis_size*=naxis_val;
}
}
else if(memcmp(&buffer[i], "CREA_DAT=", 9)==0)
{
/* CREA_DAT= '2007-08-29T16:22:09' */
/* 0123456789012345678 */
unsigned int j;
/*@
@ loop assigns j;
@ loop variant 80 - j;
@*/
for(j=0;j<80 && buffer[i+j]!='\'';j++);
if(j<60 && buffer[i+j]=='\'')
{
file_recovery->time=get_time_from_YYYY_MM_DD_HH_MM_SS(&buffer[i+j+1]);
}
}
}
/*@ assert *i_pointer <= i < buffer_size + 80; */
*i_pointer=i;
return naxis_size;
}
/*@
@ requires file_recovery->data_check==&data_check_fits;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size, file_recovery->time;
@*/
static data_check_t data_check_fits(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns file_recovery->calculated_file_size, file_recovery->time;
@ loop variant file_recovery->file_size + buffer_size/2 - (file_recovery->calculated_file_size + 8);
@*/
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 8; */
/*@ assert \valid_read(&buffer[i] + (0 .. 8-1)); */
if(memcmp(&buffer[i], "XTENSION", 8)!=0)
break;
{
unsigned int new_i=i;
/*@ assert i==new_i; */
const uint64_t tmp=fits_info(buffer, buffer_size, file_recovery, &new_i);
/*@ assert (i==new_i && i < buffer_size - 8) || (i <= new_i < buffer_size + 80); */
/*@ assert i<=new_i; */
const unsigned int diff=new_i-i;
#ifdef DEBUG_FITS
log_info("data_check_fits cfr=%llu fs=%llu i=%u buffer_size=%u\n",
(long long unsigned)file_recovery->calculated_file_size,
(long long unsigned)file_recovery->file_size,
new_i, buffer_size);
#endif
if(tmp==0)
{
file_recovery->data_check=NULL;
file_recovery->file_check=NULL;
return DC_CONTINUE;
}
/*@ assert diff < buffer_size + 80; */
file_recovery->calculated_file_size+=(uint64_t)(diff+2880-1)/2880*2880+(tmp+2880-1)/2880*2880;
}
}
if(file_recovery->file_size + buffer_size/2 >= file_recovery->calculated_file_size)
return DC_STOP;
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= 10;
@ requires separation: \separated(&file_hint_fits, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_fits(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
unsigned int i=0;
uint64_t naxis_size_max=0;
if(file_recovery_new->blocksize >= 80)
naxis_size_max=fits_info(buffer, buffer_size, file_recovery_new, &i);
if(naxis_size_max > PHOTOREC_MAX_FILE_SIZE)
return 0;
if(naxis_size_max !=0 && naxis_size_max < 2880)
return 0;
reset_file_recovery(file_recovery_new);
#ifdef DJGPP
file_recovery_new->extension="fts";
#else
file_recovery_new->extension=file_hint_fits.extension;
#endif
file_recovery_new->min_filesize=2880;
if(naxis_size_max==0)
return 1;
/* File is composed of several 2880-bytes blocks */
file_recovery_new->data_check=&data_check_fits;
file_recovery_new->file_check=&file_check_size;
file_recovery_new->calculated_file_size=(i+2880-1)/2880*2880+(naxis_size_max+2880-1)/2880*2880;
/*@ assert valid_file_recovery(file_recovery_new); */
return 1;
}
static void register_header_check_fits(file_stat_t *file_stat)
{
register_header_check(0, "SIMPLE =", 9, &header_check_fits, file_stat);
}
#endif
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