119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/*
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File: file_dir.c
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Copyright (C) 1998-2007 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_dir)
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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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#ifdef HAVE_TIME_H
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#include <time.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 "fat_common.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_dir(file_stat_t *file_stat);
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const file_hint_t file_hint_dir= {
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.extension="fat",
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.description="FAT subdirectory",
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=0,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_dir
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};
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/*@
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@ requires file_recovery->file_rename==&file_rename_fatdir;
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@ requires valid_file_rename_param(file_recovery);
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@ ensures valid_file_rename_result(file_recovery);
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@*/
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static void file_rename_fatdir(file_recovery_t *file_recovery)
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{
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unsigned char buffer[512];
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char buffer_cluster[32];
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FILE *file;
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int buffer_size;
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unsigned int cluster;
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if((file=fopen(file_recovery->filename, "rb"))==NULL)
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return;
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buffer_size=fread(buffer, 1, sizeof(buffer), file);
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fclose(file);
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if(buffer_size<32)
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return;
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/*@ assert buffer_size >= 32; */
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cluster=fat_get_cluster_from_entry((const struct msdos_dir_entry *)&buffer[0]);
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sprintf(buffer_cluster, "cluster_%u", cluster);
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#if defined(DISABLED_FOR_FRAMAC)
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buffer_cluster[sizeof(buffer_cluster)-1]='\0';
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#endif
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file_rename(file_recovery, buffer_cluster, strlen(buffer_cluster), 0, NULL, 1);
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}
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/*@
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@ requires file_recovery->data_check == &data_check_fatdir;
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@ requires buffer_size >= 2;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ ensures \result == DC_STOP;
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@ assigns file_recovery->calculated_file_size;
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@*/
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static data_check_t data_check_fatdir(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/* Save only one cluster */
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file_recovery->calculated_file_size=buffer_size/2;
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return DC_STOP;
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}
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/*@
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@ requires buffer_size >= sizeof(struct msdos_dir_entry);
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@ requires separation: \separated(&file_hint_dir, 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_dir(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 msdos_dir_entry *de=(const struct msdos_dir_entry*)buffer;
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if(!is_fat_directory(buffer))
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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_dir.extension;
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file_recovery_new->data_check=&data_check_fatdir;
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file_recovery_new->file_check=&file_check_size;
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file_recovery_new->file_rename=&file_rename_fatdir;
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file_recovery_new->time=date_dos2unix(le16(de->time),le16(de->date));
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/*@ assert valid_file_recovery(file_recovery_new); */
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return 1;
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}
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static void register_header_check_dir(file_stat_t *file_stat)
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{
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register_header_check(0, ". ", 8+3, &header_check_dir, file_stat);
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}
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#endif
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