123 lines
4.6 KiB
C
123 lines
4.6 KiB
C
/*
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File: file_dxf.c
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Copyright (C) 2009 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_dxf)
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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 "common.h"
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#include "filegen.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_dxf(file_stat_t *file_stat);
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const file_hint_t file_hint_dxf= {
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.extension="dxf",
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.description="Drawing Interchange File",
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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_dxf
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};
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/*@
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@ requires buffer_size >= 6;
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@ requires file_recovery->data_check==&data_check_dxf;
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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_dxf(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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unsigned int i;
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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 i, file_recovery->calculated_file_size;
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@*/
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for(i=(buffer_size/2)-3;i+4<buffer_size;i++)
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{
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if(buffer[i]=='\n' && buffer[i+1]=='E' && buffer[i+2]=='O' && buffer[i+3]=='F')
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{
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file_recovery->calculated_file_size=file_recovery->file_size+i+4-(buffer_size/2);
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return DC_STOP;
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}
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}
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file_recovery->calculated_file_size=file_recovery->file_size+(buffer_size/2);
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return DC_CONTINUE;
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}
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/*@
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@ requires file_recovery->file_check == &file_check_dxf;
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@ requires valid_file_check_param(file_recovery);
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@ ensures valid_file_check_result(file_recovery);
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@ assigns *file_recovery->handle, errno, Frama_C_entropy_source, file_recovery->file_size;
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@*/
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static void file_check_dxf(file_recovery_t *file_recovery)
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{
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const unsigned char dxf_footer[4]= {'\n', 'E', 'O', 'F'};
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file_search_footer(file_recovery, dxf_footer, sizeof(dxf_footer), 0);
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file_allow_nl(file_recovery, NL_BARENL|NL_CRLF);
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}
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/*@
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@ requires separation: \separated(&file_hint_dxf, 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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@ assigns *file_recovery_new;
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@*/
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static int header_check_dxf(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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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_dxf.extension;
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file_recovery_new->file_check=&file_check_dxf;
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if(file_recovery_new->blocksize >= 3)
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{
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file_recovery_new->data_check=&data_check_dxf;
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}
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return 1;
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}
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static void register_header_check_dxf(file_stat_t *file_stat)
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{
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static const unsigned char header_dxflib[10]= {'9', '9', '9', '\n',
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'd', 'x', 'f', 'l', 'i', 'b'};
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static const unsigned char header_dxflib_dos[11]= {'9', '9', '9', '\r', '\n',
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'd', 'x', 'f', 'l', 'i', 'b'};
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static const unsigned char header_dxf[11]= {' ', ' ', '0', '\n',
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'S', 'E', 'C', 'T', 'I', 'O', 'N'};
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static const unsigned char header_dxf_dos[12]= {' ', ' ', '0', '\r', '\n',
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'S', 'E', 'C', 'T', 'I', 'O', 'N'};
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register_header_check(0, header_dxf, sizeof(header_dxf), &header_check_dxf, file_stat);
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#ifndef DISABLED_FOR_FRAMAC
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register_header_check(0, header_dxf_dos, sizeof(header_dxf_dos), &header_check_dxf, file_stat);
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register_header_check(0, header_dxflib, sizeof(header_dxflib), &header_check_dxf, file_stat);
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register_header_check(0, header_dxflib_dos, sizeof(header_dxflib_dos), &header_check_dxf, file_stat);
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#endif
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}
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#endif
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