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/*
File: file_tib.c
Copyright (C) 2007-2010 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
static void register_header_check_tib(file_stat_t *file_stat);
static int header_check_tib(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);
const file_hint_t file_hint_tib= {
.extension="tib",
.description="Acronis True Image",
.min_header_distance=0,
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_tib
};
static const unsigned char tib2_footer[7]= {0x00, 0x00, 0x20, 0xa2, 0xb9, 0x24, 0xce};
static data_check_t data_check_tib2(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 512 <= file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
file_recovery->calculated_file_size+=512;
if(memcmp(&buffer[i + 512 - sizeof(tib2_footer)], tib2_footer, sizeof(tib2_footer))==0)
return DC_STOP;
}
return DC_CONTINUE;
}
static void file_check_tib2(file_recovery_t *file_recovery)
{
unsigned char*buffer=(unsigned char*)MALLOC(512);
int64_t file_size=file_recovery->calculated_file_size-512;
file_recovery->file_size = file_recovery->calculated_file_size;
if(fseek(file_recovery->handle, file_size, SEEK_SET) < 0 ||
fread(buffer, 1, 512, file_recovery->handle) != 512)
{
free(buffer);
file_recovery->file_size=0;
return;
}
if(memcmp(&buffer[512 - sizeof(tib2_footer)], tib2_footer, sizeof(tib2_footer))==0)
{
free(buffer);
return;
}
for(; file_size>0; file_size-=512)
{
unsigned int i;
if(fseek(file_recovery->handle, file_size, SEEK_SET) < 0 ||
fread(buffer, 1, 512, file_recovery->handle) != 512)
{
free(buffer);
file_recovery->file_size=0;
return;
}
for(i=0; i<512 && buffer[i]==0; i++);
if(i!=512)
{
file_recovery->file_size=file_size + 512;
free(buffer);
return ;
}
}
free(buffer);
}
static int header_check_tib(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)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_tib.extension;
return 1;
}
static int header_check_tib2(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)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_tib.extension;
if(file_recovery_new->blocksize < 512)
return 1;
file_recovery_new->file_check=&file_check_tib2;
file_recovery_new->data_check=&data_check_tib2;
return 1;
}
static void register_header_check_tib(file_stat_t *file_stat)
{
static const unsigned char tib_header[4]= { 0xb4, 0x6e, 0x68, 0x44};
static const unsigned char tib2_header[7]= { 0xce, 0x24, 0xb9, 0xa2, 0x20, 0x00, 0x00};
register_header_check(0, tib_header,sizeof(tib_header), &header_check_tib, file_stat);
register_header_check(0, tib2_header,sizeof(tib2_header), &header_check_tib2, file_stat);
}
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