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/*
File: file_cab.c
Copyright (C) 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_cab)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_cab(file_stat_t *file_stat);
const file_hint_t file_hint_cab= {
.extension="cab",
.description="Microsoft Cabinet archive",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_cab
};
struct cab_header {
uint32_t magic;
uint32_t hdr_checksum;
uint32_t filesize;
uint32_t fld_checksum;
uint32_t off_file;
uint32_t files_checksum;
uint16_t cab_version;
uint16_t nb_folder;
uint16_t nb_files;
uint16_t flags;
uint16_t setid;
uint16_t number;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size >= sizeof(struct cab_header) ;
@ requires separation: \separated(&file_hint_cab, 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_cab(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)
{
const struct cab_header *cab_hdr=(const struct cab_header*)buffer;
const unsigned int filesize=le32(cab_hdr->filesize);
if(le16(cab_hdr->cab_version)==0x0103 && filesize >= sizeof(struct cab_header))
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_cab.extension;
file_recovery_new->calculated_file_size=filesize;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
return 1;
}
return 0;
}
static void register_header_check_cab(file_stat_t *file_stat)
{
static const unsigned char cab_header[4] = { 'M','S','C','F'};
register_header_check(0, cab_header,sizeof(cab_header), &header_check_cab, file_stat);
}
#endif
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