82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/*
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File: file_wad.c
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Copyright (C) 2020 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_wad)
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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 "common.h"
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#include "filegen.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_wad(file_stat_t *file_stat);
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const file_hint_t file_hint_wad = {
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.extension = "wad",
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.description = "Doom",
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.max_filesize = PHOTOREC_MAX_SIZE_32,
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.recover = 1,
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.enable_by_default = 1,
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.register_header_check = ®ister_header_check_wad
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};
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struct wad_header
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{
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uint32_t identification;
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uint32_t numlumps;
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uint32_t infotableofs;
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} __attribute__((gcc_struct, __packed__));
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/*@
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@ requires buffer_size >= sizeof(struct wad_header);
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@ requires separation: \separated(&file_hint_wad, 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_wad(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 wad_header *hdr = (const struct wad_header *)buffer;
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const unsigned int infotableofs = le32(hdr->infotableofs);
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if(le32(hdr->numlumps) == 0)
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return 0;
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if(infotableofs < sizeof(struct wad_header))
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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_wad.extension;
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file_recovery_new->min_filesize = infotableofs;
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return 1;
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}
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static void register_header_check_wad(file_stat_t *file_stat)
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{
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register_header_check(0, "PWAD", 4, &header_check_wad, file_stat);
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#ifndef DISABLED_FOR_FRAMAC
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register_header_check(0, "IWAD", 4, &header_check_wad, file_stat);
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#endif
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}
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#endif
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