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/*
File: file_ps.c
Copyright (C) 2005,2007 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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_ps)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_ps(file_stat_t *file_stat);
const file_hint_t file_hint_ps= {
.extension="ps",
.description="PostScript or Encapsulated PostScript document",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_ps
};
static const unsigned char ps_header[11]= { '%','!','P','S','-','A','d','o','b','e','-'};
/*@
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_ps(file_recovery_t *file_recovery)
{
const unsigned char ps_footer[5]="%%EOF";
file_search_footer(file_recovery, ps_footer, sizeof(ps_footer), 1);
}
/*@
@ requires buffer_size > 8;
@ requires file_recovery->data_check==&data_check_ps;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ terminates \true;
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_ps(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
unsigned int i;
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns i, file_recovery->calculated_file_size;
@ loop variant buffer_size - (i+4);
@*/
for(i=(buffer_size/2)-4;i+4<buffer_size;i++)
{
if(buffer[i]=='%' && buffer[i+1]=='%' && buffer[i+2]=='E' && buffer[i+3]=='O' && buffer[i+4]=='F')
{
file_recovery->calculated_file_size=file_recovery->file_size+i+5-(buffer_size/2);
return DC_STOP;
}
}
file_recovery->calculated_file_size=file_recovery->file_size+(buffer_size/2);
return DC_CONTINUE;
}
/*@
@ requires separation: \separated(&file_hint_ps, 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_ps(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)
{
/* PS or EPSF */
int i;
reset_file_recovery(file_recovery_new);
file_recovery_new->min_filesize=sizeof(ps_header);
file_recovery_new->file_check=&file_check_ps;
/*@
@ loop assigns i, file_recovery_new->extension, file_recovery_new->data_check;
@ loop variant 20 - i;
@*/
for(i=sizeof(ps_header); i < 20; i++)
{
switch(buffer[i])
{
case '\n':
file_recovery_new->extension=file_hint_ps.extension;
if(file_recovery_new->blocksize > 8)
file_recovery_new->data_check=&data_check_ps;
return 1;
case 'E':
if(i+5 <= buffer_size && memcmp(&buffer[i],"EPSF-",5)==0)
{
file_recovery_new->extension="eps";
return 1;
}
break;
}
}
file_recovery_new->extension=file_hint_ps.extension;
if(file_recovery_new->blocksize > 8)
file_recovery_new->data_check=&data_check_ps;
return 1;
}
static void register_header_check_ps(file_stat_t *file_stat)
{
register_header_check(0, ps_header,sizeof(ps_header), &header_check_ps, file_stat);
}
#endif
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