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/*
File: file_ps.c
Copyright (C) 2005,2007 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_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
static void register_header_check_ps(file_stat_t *file_stat);
static int header_check_ps(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);
static data_check_t data_check_ps(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
const file_hint_t file_hint_ps= {
.extension="ps",
.description="PostScript or Encapsulated PostScript document",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_ps
};
static const unsigned char ps_header[11]= { '%','!','P','S','-','A','d','o','b','e','-'};
static void register_header_check_ps(file_stat_t *file_stat)
{
register_header_check(0, ps_header,sizeof(ps_header), &header_check_ps, file_stat);
}
static int header_check_ps(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)
{
/* PS or EPSF */
int i;
for(i=sizeof(ps_header);i<20;i++)
{
switch(buffer[i])
{
case '\n':
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_ps.extension;
file_recovery_new->data_check=&data_check_ps;
file_recovery_new->file_check=&file_check_size;
return 1;
case 'E':
if(memcmp(&buffer[i],"EPSF-",5)==0)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension="eps";
return 1;
}
break;
}
}
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_ps.extension;
file_recovery_new->data_check=&data_check_ps;
file_recovery_new->file_check=&file_check_size;
return 1;
}
static data_check_t data_check_ps(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
if(buffer_size>8)
{
unsigned int i;
for(i=(buffer_size/2)-4;i+4<buffer_size;i++)
{
if(buffer[i]=='%' && buffer[i+1]=='%' && buffer[i+2]=='E' && buffer[i+3]=='O' && buffer[i+4]=='F')
{
file_recovery->calculated_file_size=file_recovery->file_size+i+5-(buffer_size/2);
return DC_STOP;
}
}
}
file_recovery->calculated_file_size=file_recovery->file_size+(buffer_size/2);
return DC_CONTINUE;
}
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