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/*
File: file_pdf.c
Copyright (C) 1998-2007 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 "memmem.h"
static void register_header_check_pdf(file_stat_t *file_stat);
static int header_check_pdf(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 void file_check_pdf(file_recovery_t *file_recovery);
static void file_check_pdf_and_size(file_recovery_t *file_recovery);
const file_hint_t file_hint_pdf= {
.extension="pdf",
.description="Portable Document Format, Adobe Illustrator",
.min_header_distance=0,
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_pdf
};
static const unsigned char pdf_header[] = { '%','P','D','F','-','1'};
static void register_header_check_pdf(file_stat_t *file_stat)
{
register_header_check(0, pdf_header,sizeof(pdf_header), &header_check_pdf, file_stat);
}
static int header_check_pdf(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)
{
if(memcmp(buffer,pdf_header,sizeof(pdf_header))==0)
{
const unsigned char sig_illustrator[11]={'I','l','l','u','s','t','r','a','t','o','r'};
const unsigned char sig_linearized[10]={'L','i','n','e','a','r','i','z','e','d'};
const unsigned char *linearized;
reset_file_recovery(file_recovery_new);
if(td_memmem(buffer, 512, sig_illustrator,sizeof(sig_illustrator)) != NULL)
file_recovery_new->extension="ai";
else
file_recovery_new->extension=file_hint_pdf.extension;
if((linearized=(const unsigned char *)td_memmem(buffer, 512, sig_linearized, sizeof(sig_linearized))) != NULL)
{
linearized+=sizeof(sig_linearized);
while(*linearized!='>' && linearized<=buffer+512)
{
if(*linearized=='/' && *(linearized+1)=='L')
{
linearized+=2;
while(*linearized==' ' || *linearized=='\t' || *linearized=='\n' || *linearized=='\r')
linearized++;
file_recovery_new->calculated_file_size=0;
while(*linearized>='0' && *linearized<='9' && linearized<=buffer+512)
{
file_recovery_new->calculated_file_size=file_recovery_new->calculated_file_size*10+(*linearized)-'0';
linearized++;
}
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_pdf_and_size;
return 1;
}
linearized++;
}
}
file_recovery_new->file_check=&file_check_pdf;
return 1;
}
return 0;
}
static void file_check_pdf_and_size(file_recovery_t *file_recovery)
{
if(file_recovery->file_size>=file_recovery->calculated_file_size)
{
const unsigned int read_size=20;
unsigned char buffer[20+3]; /* read_size+3 */
int i;
int taille;
file_recovery->file_size=file_recovery->calculated_file_size;
if(fseek(file_recovery->handle,file_recovery->file_size-read_size,SEEK_SET)<0)
{
file_recovery->file_size=0;
return ;
}
taille=fread(buffer,1,read_size,file_recovery->handle);
for(i=taille-4;i>=0;i--)
{
if(buffer[i]=='%' && buffer[i+1]=='E' && buffer[i+2]=='O' && buffer[i+3]=='F')
return ;
}
}
file_recovery->file_size=0;
}
static void file_check_pdf(file_recovery_t *file_recovery)
{
const unsigned char pdf_footer[4]= { '%', 'E', 'O', 'F'};
file_search_footer(file_recovery, pdf_footer, sizeof(pdf_footer));
file_allow_nl(file_recovery, NL_BARENL|NL_CRLF|NL_BARECR);
}
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