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/*
File: file_axp.c
Copyright (C) 2015 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_axp)
#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"
/*@ requires \valid(file_stat); */
static void register_header_check_axp(file_stat_t *file_stat);
const file_hint_t file_hint_axp= {
.extension="axp",
.description="Pinnacle Studio",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_axp
};
const unsigned char axp_footer[34]= {
'<', 0, '/', 0, 'V', 0, 'F', 0,
'N', 0, 'G', 0, 'D', 0, 'o', 0,
'c', 0, 'u', 0, 'm', 0, 'e', 0,
'n', 0, 't', 0, '>', 0, 0x0d, 0,
0x0a, 0
};
/*@
@ requires \valid(file_recovery);
@ requires \valid(file_recovery->handle);
@ requires valid_file_recovery(file_recovery);
@ requires \separated(file_recovery, file_recovery->handle, file_recovery->extension, &errno, &Frama_C_entropy_source);
@ ensures \valid(file_recovery->handle);
@ ensures valid_file_recovery(file_recovery);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_axp(file_recovery_t *file_recovery)
{
file_search_footer(file_recovery, axp_footer, sizeof(axp_footer), 1);
}
/*@
@ requires buffer_size >= 2*sizeof(axp_footer);
@ requires (buffer_size&1)==0;
@ requires \valid_read(buffer+(0..buffer_size-1));
@ requires \valid(file_recovery);
@ requires file_recovery->data_check==&data_check_axp;
@ requires file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE;
@ requires \separated(buffer, file_recovery);
@ ensures \result == DC_CONTINUE || \result == DC_STOP;
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_axp(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
unsigned int j;
/*@
@ loop assigns j, file_recovery->calculated_file_size;
@*/
for(j=buffer_size/2-sizeof(axp_footer);
j+sizeof(axp_footer) <= buffer_size;
j++)
{
if(buffer[j]=='<' && memcmp((const char *)&buffer[j], axp_footer, sizeof(axp_footer))==0)
{
file_recovery->calculated_file_size+=j+sizeof(axp_footer)-buffer_size/2;
return DC_STOP;
}
}
file_recovery->calculated_file_size=file_recovery->file_size+(buffer_size/2);
return DC_CONTINUE;
}
/*@
@ requires buffer_size > 0;
@ requires \valid_read(buffer+(0..buffer_size-1));
@ requires valid_file_recovery(file_recovery);
@ requires \valid(file_recovery_new);
@ requires file_recovery_new->blocksize > 0;
@ requires separation: \separated(&file_hint_axp, buffer+(..), file_recovery, file_recovery_new);
@ assigns *file_recovery_new;
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_axp(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)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_axp.extension;
file_recovery_new->min_filesize=0x70+34;
file_recovery_new->file_check=&file_check_axp;
if(file_recovery_new->blocksize >= 0x34)
{
file_recovery_new->data_check=&data_check_axp;
}
return 1;
}
static void register_header_check_axp(file_stat_t *file_stat)
{
static const unsigned char axp_header[0x70]= {
0xff, 0xfe, 0x3c, 0x00, 0x3f, 0x00, 'x' , 0x00,
'm' , 0x00, 'l' , 0x00, ' ' , 0x00, 'v' , 0x00,
'e' , 0x00, 'r' , 0x00, 's' , 0x00, 'i' , 0x00,
'o' , 0x00, 'n' , 0x00, 0x3d, 0x00, 0x22, 0x00,
'1' , 0x00, '.' , 0x00, '0' , 0x00, 0x22, 0x00,
' ' , 0x00, 'e' , 0x00, 'n' , 0x00, 'c' , 0x00,
'o' , 0x00, 'd' , 0x00, 'i' , 0x00, 'n' , 0x00,
'g' , 0x00, 0x3d, 0x00, 0x22, 0x00, 'U' , 0x00,
'T' , 0x00, 'F' , 0x00, 0x2d, 0x00, '1' , 0x00,
'6' , 0x00, 0x22, 0x00, 0x3f, 0x00, 0x3e, 0x00,
0x0d, 0x00, 0x0a, 0x00, 0x3c, 0x00, 'V' , 0x00,
'F' , 0x00, 'N' , 0x00, 'G' , 0x00, 'D' , 0x00,
'o' , 0x00, 'c' , 0x00, 'u' , 0x00, 'm' , 0x00,
'e' , 0x00, 'n' , 0x00, 't' , 0x00, 0x3e, 0x00,
};
register_header_check(0, axp_header, sizeof(axp_header), &header_check_axp, file_stat);
}
#endif
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