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/*
File: file_hdf5.c
Copyright (C) 2022 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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_hdf5)
#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_HDF5
#include "log.h"
#endif
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_hdf5(file_stat_t *file_stat);
const file_hint_t file_hint_hdf5= {
.extension="h5",
.description="Hierarchical Data Format 5",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_hdf5
};
struct hdf5_superblock
{
uint8_t signature[8];
uint8_t version;
uint8_t version_global_free_space_storage;
uint8_t version_root_group_symbol_table_entry;
uint8_t reserved;
uint8_t version_shared_header_message_format;
uint8_t offsets_size;
uint8_t lengths_size;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires \separated(file_recovery, file_recovery->handle, &errno, &Frama_C_entropy_source, &__fc_heap_status);
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@*/
static void file_check_hdf5_0(file_recovery_t *file_recovery)
{
const uint8_t eof_address_offset = 0x18 + 2*8;
FILE *handle = file_recovery->handle;
uint64_t eof_address = 0;
/* Get EOF Address */
if (my_fseek(handle, eof_address_offset, SEEK_SET) < 0 ||
fread(&eof_address, sizeof(eof_address), 1, handle) != 1)
{
#ifdef DEBUG_HDF5
log_error("file_check_hdf5_0: Couldn't read HDF End of File Address");
#endif
file_recovery->file_size=0;
return;
}
eof_address = le64(eof_address);
#ifdef DEBUG_HDF5
log_info("file_check_hdf5_0: dec eof_address = %lu\n", (long unsigned)eof_address);
log_info("file_check_hdf5_0: hex eof_address = 0x%02lX\n", eof_address);
#endif
if(eof_address < eof_address_offset || eof_address < file_recovery->file_size)
{
file_recovery->file_size=0;
return;
}
file_recovery->file_size=eof_address;
}
/*@
@ requires \separated(file_recovery, file_recovery->handle, &errno, &Frama_C_entropy_source, &__fc_heap_status);
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@*/
static void file_check_hdf5_1(file_recovery_t *file_recovery)
{
const uint8_t eof_address_offset = 0x1C + 2*0x8;
FILE *handle = file_recovery->handle;
uint64_t eof_address = 0;
/* Get EOF Address */
if (my_fseek(handle, eof_address_offset, SEEK_SET) < 0 ||
fread(&eof_address, sizeof(eof_address), 1, handle) != 1)
{
#ifdef DEBUG_HDF5
log_error("file_check_hdf5_1: Couldn't read HDF End of File Address");
#endif
file_recovery->file_size=0;
return;
}
eof_address = le64(eof_address);
#ifdef DEBUG_HDF5
log_info("file_check_hdf5_1: dec eof_address = %lu\n", (long unsigned)eof_address);
log_info("file_check_hdf5_1: hex eof_address = 0x%02lX\n", eof_address);
#endif
if(eof_address < eof_address_offset || eof_address < file_recovery->file_size)
{
file_recovery->file_size=0;
return;
}
file_recovery->file_size=eof_address;
}
/*@
@ requires buffer_size >= sizeof(struct hdf5_superblock);
@ requires separation: \separated(&file_hint_hdf5, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_hdf5(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 hdf5_superblock *sb=(const struct hdf5_superblock*)&buffer[0];
/*@ assert \valid_read(sb); */
if(sb->version > 2)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_hdf5.extension;
if(sb->offsets_size != 8)
return 1;
/* Currently only handle 64-bits offsets */
if(sb->version == 0)
file_recovery_new->file_check=&file_check_hdf5_0;
else
file_recovery_new->file_check=&file_check_hdf5_1;
return 1;
}
static void register_header_check_hdf5(file_stat_t *file_stat)
{
static const unsigned char hdf5_header[8]= { 0x89, 'H', 'D', 'F', '\r', '\n', 0x1a, '\n'};
register_header_check(0, hdf5_header, sizeof(hdf5_header), &header_check_hdf5, file_stat);
}
#endif
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