138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/*
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File: file_icns.c
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Copyright (C) 2015 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_icns)
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "filegen.h"
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#include "common.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_icns(file_stat_t *file_stat);
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const file_hint_t file_hint_icns= {
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.extension="icns",
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.description="Apple Icon Image",
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_icns
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};
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struct icns_header
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{
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uint32_t magic;
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uint32_t size;
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};
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struct icon_data
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{
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char type[4];
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uint32_t size;
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// uint8_t data[0];
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};
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/*@
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@ requires \valid_read(type + (0 .. 3));
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@ assigns \nothing;
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@*/
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static int check_icon_type(const char *type)
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{
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/* https://en.wikipedia.org/wiki/Apple_Icon_Image_format */
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if(memcmp(type, "ICON", 4)==0 ||
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memcmp(type, "ICN#", 4)==0 ||
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memcmp(type, "icm#", 4)==0 ||
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memcmp(type, "icm4", 4)==0 ||
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memcmp(type, "icm8", 4)==0 ||
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memcmp(type, "ics#", 4)==0 ||
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memcmp(type, "ics4", 4)==0 ||
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memcmp(type, "ics8", 4)==0 ||
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memcmp(type, "is32", 4)==0 ||
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memcmp(type, "s8mk", 4)==0 ||
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memcmp(type, "icl4", 4)==0 ||
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memcmp(type, "icl8", 4)==0 ||
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memcmp(type, "il32", 4)==0 ||
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memcmp(type, "l8mk", 4)==0 ||
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memcmp(type, "ich#", 4)==0 ||
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memcmp(type, "ich4", 4)==0 ||
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memcmp(type, "ich8", 4)==0 ||
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memcmp(type, "ih32", 4)==0 ||
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memcmp(type, "h8mk", 4)==0 ||
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memcmp(type, "it32", 4)==0 ||
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memcmp(type, "t8mk", 4)==0 ||
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memcmp(type, "icp4", 4)==0 ||
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memcmp(type, "icp5", 4)==0 ||
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memcmp(type, "icp6", 4)==0 ||
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memcmp(type, "ic07", 4)==0 ||
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memcmp(type, "ic08", 4)==0 ||
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memcmp(type, "ic09", 4)==0 ||
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memcmp(type, "ic10", 4)==0 ||
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memcmp(type, "ic11", 4)==0 ||
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memcmp(type, "ic12", 4)==0 ||
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memcmp(type, "ic13", 4)==0 ||
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memcmp(type, "ic14", 4)==0 ||
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memcmp(type, "TOC ", 4)==0 ||
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memcmp(type, "icnV", 4)==0)
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return 1;
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return 0;
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}
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/*@
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@ requires buffer_size >= sizeof(struct icns_header) + sizeof(struct icon_data);
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@ requires separation: \separated(&file_hint_icns, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_icns(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)
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{
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const struct icns_header *hdr=(const struct icns_header *)buffer;
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const struct icon_data *icon=(const struct icon_data *)&buffer[8];
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const unsigned int hdr_size=be32(hdr->size);
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const unsigned int icon_size=be32(icon->size);
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if(hdr_size < sizeof(struct icns_header))
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return 0;
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if(icon_size < sizeof(struct icon_data))
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return 0;
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if(icon_size > hdr_size - 8)
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return 0;
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if(!check_icon_type(icon->type))
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_icns.extension;
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file_recovery_new->calculated_file_size=hdr_size;
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file_recovery_new->data_check=&data_check_size;
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file_recovery_new->file_check=&file_check_size;
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return 1;
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}
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static void register_header_check_icns(file_stat_t *file_stat)
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{
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register_header_check(0, "icns", 4, &header_check_icns, file_stat);
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}
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#endif
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