120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/*
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File: file_caf.c
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Copyright (C) 2011 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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#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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//#define DEBUG_CAF
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#ifdef DEBUG_CAF
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#include "log.h"
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#endif
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static void register_header_check_caf(file_stat_t *file_stat);
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const file_hint_t file_hint_caf= {
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.extension="caf",
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.description="Core Audio Format",
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.min_header_distance=0,
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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_caf
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};
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/* http://developer.apple.com/library/mac/documentation/MusicAudio/Reference/CAFSpec/CAF_spec/CAF_spec.html */
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static const unsigned char caf_header[12]= {
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'c' , 'a' , 'f' , 'f' , 0x00, 0x01, 0x00, 0x00,
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'd' , 'e' , 's' , 'c'
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};
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struct chunk_struct
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{
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uint32_t type;
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int64_t size;
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} __attribute__ ((__packed__));
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static int data_check_caf(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 12 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
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const struct chunk_struct *chunk=(const struct chunk_struct*)&buffer[i];
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int64_t chunk_size=be64(chunk->size);
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#ifdef DEBUG_CAF
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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",
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file_recovery->filename,
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buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
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buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
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(long long unsigned)chunk_size,
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(long long unsigned)file_recovery->calculated_file_size,
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(long long unsigned)file_recovery->calculated_file_size);
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#endif
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if(buffer[i]==0)
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{
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file_recovery->calculated_file_size--;
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return 2;
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}
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if(chunk_size >= 0)
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{
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file_recovery->calculated_file_size+=12+chunk_size;
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}
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else
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{
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file_recovery->data_check=NULL;
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file_recovery->file_check=NULL;
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return 2;
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}
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}
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#ifdef DEBUG_CAF
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log_trace("file_caf.c: new calculated_file_size %llu\n",
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(long long unsigned)file_recovery->calculated_file_size);
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#endif
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return 1;
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}
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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)
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{
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if(memcmp(&buffer[0], caf_header, sizeof(caf_header))==0)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_caf.extension;
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file_recovery_new->data_check=data_check_caf;
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file_recovery_new->file_check=&file_check_size;
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file_recovery_new->calculated_file_size=8;
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return 1;
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}
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return 0;
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}
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static void register_header_check_caf(file_stat_t *file_stat)
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{
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register_header_check(0, caf_header, sizeof(caf_header), &header_check_caf, file_stat);
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}
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