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/*
File: file_che.c
Copyright (C) 2016 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_che)
#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"
#include "log.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_che(file_stat_t *file_stat);
const file_hint_t file_hint_che= {
.extension="che",
.description="Compucon EOS Design File",
.max_filesize=100*1024*1024,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_che
};
struct che_block
{
char name[0x10];
uint32_t size;
uint32_t unk1;
uint32_t unk2;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->file_check == &file_check_che;
@ 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_che(file_recovery_t *file_recovery)
{
struct che_block block;
uint64_t offset;
uint64_t new_offset=0x19;
const uint64_t file_size_org=file_recovery->file_size;
file_recovery->file_size=0;
/*@
@ loop assigns *file_recovery->handle, errno, file_recovery->file_size;
@ loop assigns Frama_C_entropy_source;
@ loop assigns new_offset;
@ loop variant file_size_org - new_offset;
@*/
do
{
offset=new_offset;
#ifdef DEBUG_CHE
log_info("offset=0x%llx\n", (long long unsigned)offset);
#endif
if(my_fseek(file_recovery->handle, offset, SEEK_SET) < 0 ||
fread(&block, sizeof(struct che_block), 1, file_recovery->handle) != 1)
{
file_recovery->file_size=offset;
return ;
}
#ifdef DEBUG_CHE
log_info(" sizeof=0x%x, size=%x, name=%s\n", sizeof(struct che_block),le32(block.size), block.name);
#endif
new_offset=offset+sizeof(struct che_block)+le32(block.size);
if(memcmp(block.name,"ConnectionInfo",14)==0)
{
file_recovery->file_size=new_offset;
return ;
}
} while(new_offset <= file_size_org && le32(block.size)!=0);
file_recovery->file_size=offset;
}
/*@
@ requires separation: \separated(&file_hint_che, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_che(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_che.extension;
file_recovery_new->min_filesize=0x19;
file_recovery_new->file_check=&file_check_che;
return 1;
}
static void register_header_check_che(file_stat_t *file_stat)
{
register_header_check(0, "Compucon EOS Design File", 24, &header_check_che, file_stat);
}
#endif
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