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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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_ico)
#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"
#include "log.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_ico(file_stat_t *file_stat);
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_ico1[6]= {0x00 , 0x00, 0x01, 0x00, 0x01, 0x00};
static const unsigned char header_ico2[6]= {0x00 , 0x00, 0x01, 0x00, 0x02, 0x00};
static const unsigned char header_ico3[6]= {0x00 , 0x00, 0x01, 0x00, 0x03, 0x00};
static const unsigned char header_ico4[6]= {0x00 , 0x00, 0x01, 0x00, 0x04, 0x00};
static const unsigned char header_ico5[6]= {0x00 , 0x00, 0x01, 0x00, 0x05, 0x00};
static const unsigned char header_ico6[6]= {0x00 , 0x00, 0x01, 0x00, 0x06, 0x00};
static const unsigned char header_ico7[6]= {0x00 , 0x00, 0x01, 0x00, 0x07, 0x00};
static const unsigned char header_ico8[6]= {0x00 , 0x00, 0x01, 0x00, 0x08, 0x00};
static const unsigned char header_ico9[6]= {0x00 , 0x00, 0x01, 0x00, 0x09, 0x00};
/*
* 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__));
/*@
@ requires buffer_size >= sizeof(struct ico_header);
@ requires separation: \separated(&file_hint_ico, 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_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;
unsigned int i;
uint64_t fs=0;
#ifdef DEBUG_ICO
log_info("ICO: reserved=%u type=%u count=%u\n", le16(ico->reserved), le16(ico->type), le16(ico->count));
#endif
if(le16(ico->reserved)!=0 || le16(ico->type)!=1 || le16(ico->count)==0)
return 0;
/*@
@ loop assigns ico_dir, i, fs;
@ loop variant le16(ico->count) - i;
@*/
for(i=0, ico_dir=(const struct ico_directory*)(ico+1);
(const unsigned char *)(ico_dir+1) <= buffer+buffer_size && i<le16(ico->count);
i++, ico_dir++)
{
#ifdef DEBUG_ICO
log_info("ICO%u: reserved=%u color_planes=%u width=%u heigth=%u bps=%u offset=%u size=%u\n",
i, ico_dir->reserved, le16(ico_dir->color_planes), ico_dir->width, ico_dir->heigth, le16(ico_dir->bits_per_pixel),
le32(ico_dir->bitmap_offset), le32(ico_dir->bitmap_size));
#endif
if(ico_dir->reserved!=0 && ico_dir->reserved!=255)
return 0;
if(le16(ico_dir->color_planes)>1)
return 0;
if(ico_dir->width!=ico_dir->heigth)
return 0; /* Reject non square icon */
switch(ico_dir->width)
{
case 16:
case 24:
case 32:
case 48:
case 64:
case 128:
case 0: /* 256 */
break;
default:
return 0;
}
switch(le16(ico_dir->bits_per_pixel))
{
case 0:
case 1:
case 4:
case 8:
case 16:
case 24:
case 32:
break;
default:
return 0;
}
if(le32(ico_dir->bitmap_size)==0)
return 0;
if(le32(ico_dir->bitmap_offset) < sizeof(struct ico_header)+le16(ico->count)*sizeof(struct ico_directory))
return 0;
if(fs < (uint64_t)le32(ico_dir->bitmap_size) + le32(ico_dir->bitmap_offset))
fs=(uint64_t)le32(ico_dir->bitmap_size) + le32(ico_dir->bitmap_offset);
}
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_ico.extension;
file_recovery_new->calculated_file_size=fs;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
return 1;
}
static void register_header_check_ico(file_stat_t *file_stat)
{
register_header_check(0, header_ico1, sizeof(header_ico1), &header_check_ico, file_stat);
#ifndef DISABLED_FOR_FRAMAC
register_header_check(0, header_ico2, sizeof(header_ico2), &header_check_ico, file_stat);
register_header_check(0, header_ico3, sizeof(header_ico3), &header_check_ico, file_stat);
register_header_check(0, header_ico4, sizeof(header_ico4), &header_check_ico, file_stat);
register_header_check(0, header_ico5, sizeof(header_ico5), &header_check_ico, file_stat);
register_header_check(0, header_ico6, sizeof(header_ico6), &header_check_ico, file_stat);
register_header_check(0, header_ico7, sizeof(header_ico7), &header_check_ico, file_stat);
register_header_check(0, header_ico8, sizeof(header_ico8), &header_check_ico, file_stat);
register_header_check(0, header_ico9, sizeof(header_ico9), &header_check_ico, file_stat);
#endif
}
#endif
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