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/*
File: file_ico.c
Copyright (C) 2009 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.
*/
#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"
static void register_header_check_ico(file_stat_t *file_stat);
static int header_check_ico(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 file_hint_t file_hint_ico= {
.extension="ico",
.description="Windows Icon",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_ico
};
static const unsigned char header_ico[6]= {0x00 , 0x00, 0x01, 0x00, 0x01, 0x00};
static void register_header_check_ico(file_stat_t *file_stat)
{
register_header_check(0, header_ico, sizeof(header_ico), &header_check_ico, file_stat);
}
/*
* http://en.wikipedia.org/wiki/ICO_(icon_image_file_format)
*/
struct ico_header
{
uint16_t reserved;
uint16_t type;
uint16_t count;
} __attribute__ ((gcc_struct, __packed__));
struct ico_directory
{
uint8_t width;
uint8_t heigth;
uint8_t color_count;
uint8_t reserved;
uint16_t color_planes;
uint16_t bits_per_pixel;
uint32_t bitmap_size;
uint32_t bitmap_offset;
} __attribute__ ((gcc_struct, __packed__));
static int header_check_ico(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 ico_header *ico=(const struct ico_header*)buffer;
const struct ico_directory *ico_dir=(const struct ico_directory*)(ico+1);
/* Recover square icon with a single image */
if(le16(ico->reserved)==0 && le16(ico->type)==1 && le16(ico->count)==1 &&
(ico_dir->reserved==0 || ico_dir->reserved==255) &&
(ico_dir->color_planes==0 || ico_dir->color_planes==1) &&
ico_dir->width==ico_dir->heigth &&
ico_dir->width>=16 &&
(le16(ico_dir->bits_per_pixel)==1 ||
le16(ico_dir->bits_per_pixel)==4 ||
le16(ico_dir->bits_per_pixel)==8 ||
le16(ico_dir->bits_per_pixel)==16 ||
le16(ico_dir->bits_per_pixel)==32) &&
le32(ico_dir->bitmap_offset) >= sizeof(struct ico_header)+le16(ico->count)*sizeof(struct ico_directory) &&
le32(ico_dir->bitmap_size) > 0)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_ico.extension;
file_recovery_new->calculated_file_size=(uint64_t)le32(ico_dir->bitmap_size) + le32(ico_dir->bitmap_offset);
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
return 1;
}
return 0;
}
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