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/*
File: file_rar.c
Copyright (C) 1998-2005,2007 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_rar)
#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_register_header_check(file_stat); */
static void register_header_check_rar(file_stat_t *file_stat);
const file_hint_t file_hint_rar= {
.extension="rar",
.description="Rar archive",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_rar
};
#define MHD_PASSWORD 0x0080U
/*@
@ requires file_recovery->file_check == &file_check_rar15fmt;
@ 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_rar15fmt(file_recovery_t *file_recovery)
{
static const unsigned char rar15fmt_footer[7]={0xc4, 0x3d, 0x7b, 0x00, 0x40, 0x07, 0x00 };
file_search_footer(file_recovery, rar15fmt_footer, sizeof(rar15fmt_footer), 0);
}
/*@
@ requires buffer_size >= 0xb;
@ requires separation: \separated(&file_hint_rar, 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_rar15fmt(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->min_filesize=70;
if((buffer[0xa] & MHD_PASSWORD)==0)
file_recovery_new->file_check=&file_check_rar15fmt;
file_recovery_new->extension=file_hint_rar.extension;
return 1;
}
/*@
@ requires file_recovery->file_check == &file_check_rar50fmt;
@ 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_rar50fmt(file_recovery_t *file_recovery)
{
static const unsigned char rar50fmt_footer[8]={0x1d, 0x77, 0x56, 0x51, 0x03, 0x05, 0x04, 0x00 };
file_search_footer(file_recovery, rar50fmt_footer, sizeof(rar50fmt_footer), 0);
}
/*@
@ requires buffer_size >= 0xb;
@ requires separation: \separated(&file_hint_rar, 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_rar50fmt(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->min_filesize=60;
if((buffer[0xa] & MHD_PASSWORD)==0)
file_recovery_new->file_check=&file_check_rar50fmt;
file_recovery_new->extension=file_hint_rar.extension;
return 1;
}
static void register_header_check_rar(file_stat_t *file_stat)
{
static const unsigned char rar15fmt_header[7]={0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x00 };
static const unsigned char rar50fmt_header[8]={0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x01, 0x00 };
register_header_check(0, rar15fmt_header,sizeof(rar15fmt_header), &header_check_rar15fmt, file_stat);
register_header_check(0, rar50fmt_header,sizeof(rar50fmt_header), &header_check_rar50fmt, file_stat);
}
#endif
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