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/*
File: file_hdf.c
Copyright (C) 2011 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"
#ifdef DEBUG_HDF
#include "log.h"
#endif
#if defined(HAVE_FSEEKO) && !defined(__MINGW32__)
#define my_fseek fseeko
#else
#define my_fseek fseek
#endif
static void register_header_check_hdf(file_stat_t *file_stat);
const file_hint_t file_hint_hdf= {
.extension="hdf",
.description="Hierarchical Data Format 4",
.max_filesize=PHOTOREC_MAX_SIZE_32,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_hdf
};
struct ddh_struct
{
uint16_t size;
uint32_t next;
} __attribute__ ((gcc_struct, __packed__));
struct dd_struct
{
uint16_t tag;
uint16_t ref;
uint32_t offset;
uint32_t length;
} __attribute__ ((gcc_struct, __packed__));
static void file_check_hdf(file_recovery_t *file_recovery)
{
uint64_t file_size=0;
unsigned int offset_old=4;
unsigned int offset=4;
struct dd_struct *dd=(struct dd_struct *)MALLOC(sizeof(struct dd_struct)*65536);
do
{
struct ddh_struct ddh;
const struct dd_struct *p;
unsigned int i;
unsigned int size;
if(my_fseek(file_recovery->handle, offset, SEEK_SET) < 0 ||
fread(&ddh, sizeof(ddh), 1, file_recovery->handle) !=1 ||
be16(ddh.size)==0 ||
fread(dd, sizeof(struct dd_struct)*be16(ddh.size), 1, file_recovery->handle) !=1)
{
free(dd);
file_recovery->file_size=0;
return ;
}
if(file_size < offset + sizeof(struct dd_struct) * be16(ddh.size))
file_size = offset + sizeof(struct dd_struct) * be16(ddh.size);
#ifdef DEBUG_HDF
log_info("size=%u next=%lu\n", be16(ddh.size), be32(ddh.next));
#endif
size=be16(ddh.size);
for(i=0, p=dd; i < size; i++,p++)
{
#ifdef DEBUG_HDF
log_info("tag=0x%04x, ref=%u, offset=%lu, length=%lu\n",
be16(p->tag), be16(p->ref), be32(p->offset), be32(p->length));
#endif
if((unsigned)be32(p->offset)!=(unsigned)(-1) &&
file_size < (unsigned)be32(p->offset) + (unsigned)be32(p->length))
file_size = (unsigned)be32(p->offset) + (unsigned)be32(p->length);
}
offset_old=offset;
offset=be32(ddh.next);
} while(offset > offset_old);
free(dd);
file_size++;
#ifdef DEBUG_HDF
log_info("file_size %llu\n", (long long unsigned)file_size);
#endif
if(file_recovery->file_size < file_size)
file_recovery->file_size=0;
else
file_recovery->file_size = file_size;
}
static int header_check_hdf(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 struct ddh_struct *ddh=(const struct ddh_struct *)&buffer[4];
if(be16(ddh->size)==0)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_hdf.extension;
file_recovery_new->file_check=&file_check_hdf;
return 1;
}
static void register_header_check_hdf(file_stat_t *file_stat)
{
static const unsigned char hdf_header[4]= { 0x0e, 0x03, 0x13, 0x01};
register_header_check(0, hdf_header, sizeof(hdf_header), &header_check_hdf, file_stat);
}
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