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/*
File: file_bmp.c
Copyright (C) 1998-2007 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_bmp)
#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"
#if defined(__FRAMAC__)
#include "__fc_builtin.h"
#endif
/*@
@ requires valid_register_header_check(file_stat);
@*/
static void register_header_check_bmp(file_stat_t *file_stat);
const file_hint_t file_hint_bmp= {
.extension="bmp",
.description="BMP bitmap image",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_bmp
};
static const unsigned char bmp_header[2]= {'B','M'};
struct bmp_header
{
uint16_t magic;
uint32_t size;
uint32_t reserved;
uint32_t offset;
uint32_t hdr_size;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size >= 18;
@ requires separation: \separated(&file_hint_bmp, 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);
@ ensures (\result == 1) ==> (file_recovery_new->file_stat == \null);
@ ensures (\result == 1) ==> (file_recovery_new->handle == \null);
@ ensures (\result == 1) ==> (file_recovery_new->time == 0);
@ ensures (\result == 1) ==> (file_recovery_new->extension == file_hint_bmp.extension);
@ ensures (\result == 1) ==> (file_recovery_new->calculated_file_size >= 65);
@ ensures (\result == 1) ==> (file_recovery_new->file_size == 0);
@ ensures (\result == 1) ==> (file_recovery_new->min_filesize == 65);
@ ensures (\result == 1) ==> (file_recovery_new->data_check == &data_check_size);
@ ensures (\result == 1) ==> (file_recovery_new->file_check == &file_check_size);
@ ensures (\result == 1) ==> (file_recovery_new->file_rename == \null);
@ assigns file_recovery_new->filename[0];
@ assigns file_recovery_new->time;
@ assigns file_recovery_new->file_stat;
@ assigns file_recovery_new->handle;
@ assigns file_recovery_new->file_size;
@ assigns file_recovery_new->location.list.prev;
@ assigns file_recovery_new->location.list.next;
@ assigns file_recovery_new->location.end;
@ assigns file_recovery_new->location.data;
@ assigns file_recovery_new->extension;
@ assigns file_recovery_new->min_filesize;
@ assigns file_recovery_new->calculated_file_size;
@ assigns file_recovery_new->data_check;
@ assigns file_recovery_new->file_check;
@ assigns file_recovery_new->file_rename;
@ assigns file_recovery_new->offset_error;
@ assigns file_recovery_new->offset_ok;
@ assigns file_recovery_new->checkpoint_status;
@ assigns file_recovery_new->checkpoint_offset;
@ assigns file_recovery_new->flags;
@ assigns file_recovery_new->extra;
@ assigns file_recovery_new->data_check_tmp;
@*/
// ensures (\result == 1) ==> \separated(file_recovery_new, file_recovery_new->extension);
static int header_check_bmp(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)
{
/*@ assert \valid_read(buffer+(0..buffer_size-1)); */
/*@ assert \initialized(buffer+(0..buffer_size-1)); */
const struct bmp_header *bm=(const struct bmp_header *)buffer;
/*@ assert \valid_read(bm); */
if(buffer[0]!='B' || buffer[1]!='M')
return 0;
if(bm->reserved!=0)
return 0;
if(
(buffer[14]==12 || buffer[14]==64 || buffer[14]==40 || buffer[14]==52 ||
buffer[14]==56 || buffer[14]==108 || buffer[14]==124) &&
buffer[15]==0 && buffer[16]==0 && buffer[17]==0 &&
le32(bm->offset) < le32(bm->size) &&
le32(bm->size) >= 65 &&
le32(bm->hdr_size) < le32(bm->size))
{
/* See http://en.wikipedia.org/wiki/BMP_file_format */
reset_file_recovery(file_recovery_new);
/*@ assert file_recovery_new->file_stat == \null; */
/*@ assert file_recovery_new->handle == \null; */
file_recovery_new->extension=file_hint_bmp.extension;
file_recovery_new->min_filesize=65;
file_recovery_new->calculated_file_size=(uint64_t)le32(bm->size);
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
/*@ assert file_recovery_new->extension == file_hint_bmp.extension; */
/*@ assert file_recovery_new->calculated_file_size >= 65; */
/*@ assert file_recovery_new->file_size == 0; */
/*@ assert file_recovery_new->min_filesize == 65; */
/*@ assert file_recovery_new->data_check == &data_check_size; */
/*@ assert file_recovery_new->file_check == &file_check_size; */
/*@ assert valid_read_string(file_recovery_new->extension); */
/*@ assert \initialized(&file_recovery_new->time); */
/*@ assert valid_file_recovery(file_recovery_new); */
return 1;
}
return 0;
}
static void register_header_check_bmp(file_stat_t *file_stat)
{
register_header_check(0, bmp_header,sizeof(bmp_header), &header_check_bmp, file_stat);
}
#endif
#if defined(MAIN_bmp)
#define BLOCKSIZE 65536u
int main(void)
{
const char fn[] = "recup_dir.1/f0000000.bmp";
unsigned char buffer[BLOCKSIZE];
file_recovery_t file_recovery_new;
file_recovery_t file_recovery;
file_stat_t file_stats;
/*@ assert \valid(buffer + (0 .. (BLOCKSIZE - 1))); */
#if defined(__FRAMAC__)
Frama_C_make_unknown((char *)buffer, BLOCKSIZE);
#endif
reset_file_recovery(&file_recovery);
/*@ assert file_recovery.file_stat == \null; */
file_recovery.blocksize=BLOCKSIZE;
file_recovery_new.blocksize=BLOCKSIZE;
file_recovery_new.data_check=NULL;
file_recovery_new.file_stat=NULL;
file_recovery_new.file_check=NULL;
file_recovery_new.file_rename=NULL;
file_recovery_new.calculated_file_size=0;
file_recovery_new.file_size=0;
file_recovery_new.location.start=0;
file_stats.file_hint=&file_hint_bmp;
file_stats.not_recovered=0;
file_stats.recovered=0;
register_header_check_bmp(&file_stats);
if(header_check_bmp(buffer, BLOCKSIZE, 0u, &file_recovery, &file_recovery_new)!=1)
return 0;
/*@ assert valid_read_string((char *)&fn); */
memcpy(file_recovery_new.filename, fn, sizeof(fn));
file_recovery_new.file_stat=&file_stats;
/*@ assert valid_read_string((char *)file_recovery_new.filename); */
/*@ assert file_recovery_new.extension == file_hint_bmp.extension; */
/*@ assert file_recovery_new.calculated_file_size >= 65; */
/*@ assert file_recovery_new.file_size == 0; */
/*@ assert file_recovery_new.min_filesize == 65; */
/*@ assert file_recovery_new.file_check == &file_check_size; */
/*@ assert file_recovery_new.data_check == &data_check_size; */
/*@ assert file_recovery_new.file_stat->file_hint!=NULL; */
{
unsigned char big_buffer[2*BLOCKSIZE];
data_check_t res_data_check=DC_CONTINUE;
memset(big_buffer, 0, BLOCKSIZE);
memcpy(big_buffer + BLOCKSIZE, buffer, BLOCKSIZE);
/*@ assert file_recovery_new.data_check == &data_check_size; */
/*@ assert file_recovery_new.file_size == 0; */;
/*@ assert file_recovery_new.file_size <= file_recovery_new.calculated_file_size; */;
res_data_check=data_check_size(big_buffer, 2*BLOCKSIZE, &file_recovery_new);
file_recovery_new.file_size+=BLOCKSIZE;
if(res_data_check == DC_CONTINUE)
{
memcpy(big_buffer, big_buffer + BLOCKSIZE, BLOCKSIZE);
#if defined(__FRAMAC__)
Frama_C_make_unknown((char *)big_buffer + BLOCKSIZE, BLOCKSIZE);
#endif
data_check_size(big_buffer, 2*BLOCKSIZE, &file_recovery_new);
}
}
{
file_recovery_t file_recovery_new2;
file_recovery_new2.blocksize=BLOCKSIZE;
file_recovery_new2.file_stat=NULL;
file_recovery_new2.file_check=NULL;
file_recovery_new2.location.start=BLOCKSIZE;
file_recovery_new.handle=NULL; /* In theory should be not null */
#if defined(__FRAMAC__)
Frama_C_make_unknown((char *)buffer, BLOCKSIZE);
#endif
/*@ assert valid_read_string((char *)file_recovery_new.filename); */
header_check_bmp(buffer, BLOCKSIZE, 0, &file_recovery_new, &file_recovery_new2);
}
/*@ assert valid_read_string((char *)file_recovery_new.filename); */
file_recovery_new.handle=fopen(fn, "rb");
/*@ assert file_recovery_new.file_check == &file_check_size; */
if(file_recovery_new.handle!=NULL)
{
file_check_size(&file_recovery_new);
fclose(file_recovery_new.handle);
}
return 0;
}
#endif
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