95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/*
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File: file_addressbook.c
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Copyright (C) 2007-2008 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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#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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#include "log.h"
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static void register_header_check_ab(file_stat_t *file_stat);
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const file_hint_t file_hint_addressbook= {
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.extension="ab",
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.description="MAC Address Book",
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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_ab
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};
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struct ab_header
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{
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char magic[4];
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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_addressbook(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 + 8 < 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 ab_header *ab=(const struct ab_header *)&buffer[i];
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const unsigned int length=be32(ab->size);
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#ifdef DEBUG_AB
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log_debug("data_check_addressbook i=0x%x buffer_size=0x%x calculated_file_size=%lu file_size=%lu\n",
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i, buffer_size,
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(long unsigned)file_recovery->calculated_file_size,
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(long unsigned)file_recovery->file_size);
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dump_log(buffer+i,8);
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#endif
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if(ab->magic[0]!='L' || ab->magic[1]!='J' || ab->magic[3]!=0x00 || length<8)
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return DC_STOP;
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file_recovery->calculated_file_size+=length;
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}
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return DC_CONTINUE;
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}
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static int header_check_addressbook(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 ab_header *ab=(const struct ab_header *)buffer;
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const unsigned int length=be32(ab->size);
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if(ab->magic[0]!='L' || ab->magic[1]!='J' || ab->magic[3]!=0x00 || length<8)
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return 0;
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if(ab->magic[2]!=0x1a && ab->magic[2]!=0x0a)
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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_addressbook.extension;
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if(file_recovery_new->blocksize >= 8)
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{
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file_recovery_new->calculated_file_size=length;
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file_recovery_new->data_check=&data_check_addressbook;
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file_recovery_new->file_check=&file_check_size;
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}
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return 1;
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}
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static void register_header_check_ab(file_stat_t *file_stat)
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{
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static const unsigned char ab_header[2]={ 'L', 'J' };
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register_header_check(0, ab_header,sizeof(ab_header), &header_check_addressbook, file_stat);
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}
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