235 lines
7.7 KiB
C
235 lines
7.7 KiB
C
/*
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File: file_dv.c
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Copyright (C) 2006-2007 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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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_dv)
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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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#if defined(__FRAMAC__)
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#include "__fc_builtin.h"
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#endif
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_dv(file_stat_t *file_stat);
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const file_hint_t file_hint_dv= {
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.extension="dv",
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.description="DIF Digital Video",
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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_dv
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};
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/*@
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@ requires file_recovery->data_check==&data_check_NTSC;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ assigns file_recovery->calculated_file_size;
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@*/
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static data_check_t data_check_NTSC(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@
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@ loop assigns file_recovery->calculated_file_size;
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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 + 8 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
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/*@ assert 0 <= i < buffer_size - 8; */
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if(buffer[i]==0x1f && buffer[i+1]==0x07 && buffer[i+2]==0x00 &&
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buffer[i+5]==0x78 && buffer[i+6]==0x78 && buffer[i+7]==0x78)
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file_recovery->calculated_file_size+=120000;
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else
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return DC_STOP;
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}
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return DC_CONTINUE;
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}
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/*@
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@ requires fr->file_check == &file_check_dv_NTSC;
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@ requires valid_file_check_param(fr);
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@ ensures valid_file_check_result(fr);
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@ assigns *fr->handle, errno, Frama_C_entropy_source, fr->file_size;
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@*/
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static void file_check_dv_NTSC(file_recovery_t *fr)
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{
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char buffer_header[512];
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uint64_t fs=fr->file_size/120000*120000;
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if(my_fseek(fr->handle, 0, SEEK_SET) < 0 ||
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fread(&buffer_header, sizeof(buffer_header), 1, fr->handle) != 1)
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return ;
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#if defined(__FRAMAC__)
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Frama_C_make_unknown(&buffer_header, sizeof(buffer_header));
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#endif
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if(fs > 0)
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fs-=120000;
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if(fs > 0)
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fs-=120000;
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/*@ loop assigns fs, *fr->handle, errno, Frama_C_entropy_source, fr->file_size; */
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while(fs < fr->file_size &&
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my_fseek(fr->handle, fs, SEEK_SET) >= 0)
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{
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char buffer[120000];
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unsigned int i;
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if(fread(&buffer, sizeof(buffer), 1, fr->handle) != 1)
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{
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fr->file_size=fs;
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return;
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}
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#if defined(__FRAMAC__)
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Frama_C_make_unknown(&buffer, sizeof(buffer));
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#endif
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/*@ loop assigns i, fr->file_size; */
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for(i=1; i<sizeof(buffer); i+=0x50)
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if((buffer[i]&0x0f)!=(buffer_header[1]&0x0f))
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{
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fr->file_size=fs;
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return;
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}
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fs+=sizeof(buffer);
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}
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fr->file_size=fs;
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}
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/*@
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@ requires file_recovery->data_check==&data_check_PAL;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ assigns file_recovery->calculated_file_size;
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@*/
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static data_check_t data_check_PAL(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert buffer_size <= 2 * PHOTOREC_MAX_BLOCKSIZE; */
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/*@
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@ loop assigns file_recovery->calculated_file_size;
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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 + 8 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
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/*@ assert 0 <= i < buffer_size - 8; */
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if(buffer[i]==0x1f && buffer[i+1]==0x07 && buffer[i+2]==0x00 &&
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buffer[i+5]==0x78 && buffer[i+6]==0x78 && buffer[i+7]==0x78)
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file_recovery->calculated_file_size+=144000;
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else
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return DC_STOP;
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}
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return DC_CONTINUE;
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}
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/*@
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@ requires fr->file_check == &file_check_dv_PAL;
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@ requires valid_file_check_param(fr);
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@ ensures valid_file_check_result(fr);
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@ assigns *fr->handle, errno, Frama_C_entropy_source, fr->file_size;
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@*/
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static void file_check_dv_PAL(file_recovery_t *fr)
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{
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char buffer_header[512];
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uint64_t fs=fr->file_size/144000*144000;
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if(my_fseek(fr->handle, 0, SEEK_SET) < 0 ||
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fread(&buffer_header, sizeof(buffer_header), 1, fr->handle) != 1)
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return ;
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#if defined(__FRAMAC__)
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Frama_C_make_unknown(&buffer_header, sizeof(buffer_header));
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#endif
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if(fs > 0)
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fs-=144000;
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if(fs > 0)
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fs-=144000;
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/*@ loop assigns fs, *fr->handle, errno, Frama_C_entropy_source, fr->file_size; */
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while(fs < fr->file_size &&
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my_fseek(fr->handle, fs, SEEK_SET) >= 0)
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{
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unsigned int i;
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char buffer[144000];
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if(fread(&buffer, sizeof(buffer), 1, fr->handle) != 1)
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{
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fr->file_size=fs;
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return;
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}
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#if defined(__FRAMAC__)
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Frama_C_make_unknown(&buffer, sizeof(buffer));
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#endif
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/*@ loop assigns i, fr->file_size; */
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for(i=1; i<sizeof(buffer); i+=0x50)
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if((buffer[i]&0x0f)!=(buffer_header[1]&0x0f))
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{
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fr->file_size=fs;
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return;
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}
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fs+=sizeof(buffer);
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}
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fr->file_size=fs;
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}
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/*@
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@ requires buffer_size >= 8;
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@ requires separation: \separated(&file_hint_dv, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@*/
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static int header_check_dv(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(buffer[0]!=0x1f || buffer[1]!=0x07 || buffer[2]!=0x00 || buffer[5]!=0x78 || buffer[6]!=0x78 || buffer[7]!=0x78)
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return 0;
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if(file_recovery->file_stat!=NULL &&
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file_recovery->file_check!=NULL &&
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file_recovery->file_stat->file_hint==&file_hint_dv)
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{
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/*@ assert \valid_function(file_recovery->file_check); */
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header_ignored(file_recovery_new);
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return 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_dv.extension;
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if((buffer[3]&0x80)==0)
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file_recovery_new->file_check=&file_check_dv_NTSC;
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else
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file_recovery_new->file_check=&file_check_dv_PAL;
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if(file_recovery_new->blocksize < 8)
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return 1;
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// Each frame contains exactly 120000 bytes in NTSC, 144000 in PAL.
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if((buffer[3]&0x80)==0)
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file_recovery_new->data_check=&data_check_NTSC;
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else
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file_recovery_new->data_check=&data_check_PAL;
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return 1;
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}
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static void register_header_check_dv(file_stat_t *file_stat)
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{
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static const unsigned char dv_header[3]= {0x1f, 0x07, 0x00};
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register_header_check(0, dv_header,sizeof(dv_header), &header_check_dv, file_stat);
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}
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#endif
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