115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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File: file_mig.c
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Copyright (C) 2012 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_mig)
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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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#ifdef DEBUG_MIG
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#include "log.h"
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#endif
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static void register_header_check_mig(file_stat_t *file_stat);
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const file_hint_t file_hint_mig= {
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.extension="mig",
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.description="Windows Migration Backup",
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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_mig
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};
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struct MIG_HDR
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{
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uint32_t magic;
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uint32_t fn_size;
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uint32_t s_size;
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uint32_t unk1;
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uint32_t unk2;
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uint32_t unk3;
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unsigned char fn[0];
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} __attribute__ ((gcc_struct, __packed__));
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static void file_check_mig(file_recovery_t *file_recovery)
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{
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struct MIG_HDR h;
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uint64_t offset=0x34;
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file_recovery->file_size=0;
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while(1)
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{
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size_t res;
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if(my_fseek(file_recovery->handle, offset, SEEK_SET) < 0)
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{
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#ifdef DEBUG_MIG
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log_info("0x%lx fseek failed\n", (long unsigned)offset);
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#endif
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return ;
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}
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res=fread(&h, 1, sizeof(h), file_recovery->handle);
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if(res < 8)
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{
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#ifdef DEBUG_MIG
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log_info("0x%lx not enough data\n", (long unsigned)offset);
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#endif
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return ;
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}
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if(res < sizeof(h) || le32(h.magic)!=0x5354524d) /* STRM=stream */
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{
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#ifdef DEBUG_MIG
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log_info("0x%lx no magic %x\n", (long unsigned)offset, le32(h.magic));
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#endif
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file_recovery->file_size=offset+8;
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return ;
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}
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#ifdef DEBUG_MIG
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log_info("0x%lx magic s_size=0x%u\n", (long unsigned)offset, le32(h.s_size));
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#endif
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offset+=sizeof(h)+le32(h.s_size);
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}
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}
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static int header_check_mig(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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if(memcmp(&buffer[0x34], "MRTS", 4)!=0)
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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_mig.extension;
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file_recovery_new->file_check=&file_check_mig;
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return 1;
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}
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static void register_header_check_mig(file_stat_t *file_stat)
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{
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static const unsigned char mig_header[8]= {
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'1' , 'g' , 'i' , 'M' , 0x02, 0x00, 0x00, 0x00
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};
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register_header_check(0, mig_header, sizeof(mig_header), &header_check_mig, file_stat);
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}
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#endif
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