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/*
File: file_cwk.c
Copyright (C) 2006-2007 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_cwk)
#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"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_cwk(file_stat_t *file_stat);
const file_hint_t file_hint_cwk= {
.extension="cwk",
.description="AppleWorks",
.max_filesize=200*1024*1024,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_cwk
};
/* http://wiki.wirelust.com/x/index.php/AppleWorks_/_ClarisWorks */
struct cwk_header
{
unsigned char major_version;
unsigned char minor_version[3];
uint32_t creator_type; /* BOBO */
unsigned char old_major_version;
unsigned char old_minor_version[3];
uint64_t reserved0;
uint16_t reserved1;
uint16_t marker;
uint16_t unk1;
uint32_t unk2;
uint16_t height;
uint16_t width;
uint16_t margins[6];
uint16_t inner_height;
uint16_t inner_width;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->file_check == &file_check_cwk;
@ 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_cwk(file_recovery_t *file_recovery)
{
const unsigned char cwk_footer[4]= {0xf0, 0xf1, 0xf2, 0xf3};
file_search_footer(file_recovery, cwk_footer, sizeof(cwk_footer), 4);
}
/*@
@ requires buffer_size >= sizeof(struct cwk_header);
@ requires separation: \separated(&file_hint_cwk, 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_cwk(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 cwk_header *cwk=(const struct cwk_header *)buffer;
if(be64(cwk->reserved0)!=0 || be16(cwk->reserved1)!=1)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_cwk.extension;
file_recovery_new->file_check=&file_check_cwk;
return 1;
}
static void register_header_check_cwk(file_stat_t *file_stat)
{
static const unsigned char cwk_header[4]= {'B','O','B','O'};
register_header_check(4, cwk_header,sizeof(cwk_header), &header_check_cwk, file_stat);
}
#endif
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