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/*
File: file_caf.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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_caf)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
//#define DEBUG_CAF
#ifdef DEBUG_CAF
#include "log.h"
#endif
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_caf(file_stat_t *file_stat);
const file_hint_t file_hint_caf= {
.extension="caf",
.description="Core Audio Format",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_caf
};
/* https://developer.apple.com/library/archive/documentation/MusicAudio/Reference/CAFSpec/CAF_spec/CAF_spec.html */
struct chunk_struct
{
uint32_t type;
/* The correct type is int64_t but */
uint64_t size;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->data_check==&data_check_caf;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ terminates \true;
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size,file_recovery->data_check,file_recovery->file_check;
@*/
static data_check_t data_check_caf(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size/2 - (file_recovery->calculated_file_size + 12);
@*/
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 12 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 12; */
const struct chunk_struct *chunk=(const struct chunk_struct*)&buffer[i];
const uint64_t chunk_size=be64(chunk->size);
#ifdef DEBUG_CAF
log_trace("file_caf.c: %s chunk %c%c%c%c (0x%02x%02x%02x%02x) size %llu, calculated_file_size %llu (0x%llx)\n",
file_recovery->filename,
buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
(long long unsigned)chunk_size,
(long long unsigned)file_recovery->calculated_file_size,
(long long unsigned)file_recovery->calculated_file_size);
#endif
if(buffer[i]==0)
{
/* Always true */
if(file_recovery->calculated_file_size > 0)
file_recovery->calculated_file_size--;
return DC_STOP;
}
/* The correct type is int64_t, 0x7ffffffffffffff >= PHOTOREC_MAX_FILE_SIZE */
if(chunk_size>PHOTOREC_MAX_FILE_SIZE)
{
file_recovery->data_check=NULL;
file_recovery->file_check=NULL;
return DC_STOP;
}
file_recovery->calculated_file_size+=(uint64_t)12+chunk_size;
}
#ifdef DEBUG_CAF
log_trace("file_caf.c: new calculated_file_size %llu\n",
(long long unsigned)file_recovery->calculated_file_size);
#endif
return DC_CONTINUE;
}
/*@
@ requires separation: \separated(&file_hint_caf, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ ensures \result!=0 && file_recovery_new->data_check==&data_check_caf ==> file_recovery_new->calculated_file_size == 8;
@ assigns *file_recovery_new;
@*/
static int header_check_caf(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 chunk_struct *chunk=(const struct chunk_struct*)&buffer[8];
const uint64_t chunk_size=be64(chunk->size);
if(chunk_size >= PHOTOREC_MAX_FILE_SIZE)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_caf.extension;
file_recovery_new->min_filesize=8+12;
if(file_recovery_new->blocksize >= 12)
{
file_recovery_new->data_check=&data_check_caf;
file_recovery_new->file_check=&file_check_size;
file_recovery_new->calculated_file_size=8;
}
/*@ assert file_recovery_new->data_check==&data_check_caf ==> file_recovery_new->calculated_file_size == 8; */
return 1;
}
static void register_header_check_caf(file_stat_t *file_stat)
{
static const unsigned char caf_header[12]= {
'c' , 'a' , 'f' , 'f' , 0x00, 0x01, 0x00, 0x00,
'd' , 'e' , 's' , 'c'
};
register_header_check(0, caf_header, sizeof(caf_header), &header_check_caf, file_stat);
}
#endif
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