100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
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File: file_dad.c
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Copyright (C) 2014 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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#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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#include "log.h"
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static void register_header_check_dad(file_stat_t *file_stat);
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const file_hint_t file_hint_dad= {
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.extension="dad",
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.description="Micae DVR",
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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_dad
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};
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struct dad_header
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{
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uint32_t magic;
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uint32_t unk1;
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uint32_t unk2;
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uint32_t size;
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} __attribute__ ((gcc_struct, __packed__));
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static data_check_t data_check_dad(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 16 <= file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
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const struct dad_header *dad=(const struct dad_header *)&buffer[i];
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#ifdef DEBUG_DAD
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log_info("%llu magic %08x => %llu\n",
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(long long unsigned)file_recovery->calculated_file_size, le32(dad->magic),
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(long long unsigned)file_recovery->calculated_file_size + le32(dad->size));
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#endif
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if(dad->magic!=le32(0x56414844) || le32(dad->size)<16)
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return DC_STOP;
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file_recovery->calculated_file_size+=le32(dad->size);
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}
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return DC_CONTINUE;
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}
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static int header_check_dad(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 dad_header *dad=(const struct dad_header *)buffer;
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if(le32(dad->size)<16)
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return 0;
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if(file_recovery->file_stat!=NULL &&
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file_recovery->file_stat->file_hint==&file_hint_dad &&
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(file_recovery->calculated_file_size==file_recovery->file_size ||
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file_recovery->blocksize < 16))
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{
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header_ignored(file_recovery_new);
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return 0;
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}
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_dad.extension;
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file_recovery_new->min_filesize=le32(dad->size);
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if(file_recovery_new->blocksize >= 16)
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{
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file_recovery_new->data_check=&data_check_dad;
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file_recovery_new->file_check=&file_check_size_max;
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}
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return 1;
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}
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static void register_header_check_dad(file_stat_t *file_stat)
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{
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register_header_check(0, "DHAV", 4, &header_check_dad, file_stat);
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}
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