120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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File: file_che.c
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Copyright (C) 2016 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_che)
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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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#include "log.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_che(file_stat_t *file_stat);
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const file_hint_t file_hint_che= {
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.extension="che",
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.description="Compucon EOS Design File",
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.max_filesize=100*1024*1024,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_che
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};
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struct che_block
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{
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char name[0x10];
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uint32_t size;
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uint32_t unk1;
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uint32_t unk2;
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires file_recovery->file_check == &file_check_che;
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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, file_recovery->file_size;
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@ assigns Frama_C_entropy_source;
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@
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@*/
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static void file_check_che(file_recovery_t *file_recovery)
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{
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struct che_block block;
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uint64_t offset;
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uint64_t new_offset=0x19;
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const uint64_t file_size_org=file_recovery->file_size;
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file_recovery->file_size=0;
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/*@
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@ loop assigns *file_recovery->handle, errno, file_recovery->file_size;
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@ loop assigns Frama_C_entropy_source;
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@*/
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do
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{
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offset=new_offset;
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#ifdef DEBUG_CHE
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log_info("offset=0x%llx\n", (long long unsigned)offset);
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#endif
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if(my_fseek(file_recovery->handle, offset, SEEK_SET) < 0 ||
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fread(&block, sizeof(struct che_block), 1, file_recovery->handle) != 1)
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{
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file_recovery->file_size=offset;
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return ;
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}
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#ifdef DEBUG_CHE
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log_info(" sizeof=0x%x, size=%x, name=%s\n", sizeof(struct che_block),le32(block.size), block.name);
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#endif
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new_offset=offset+sizeof(struct che_block)+le32(block.size);
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if(memcmp(block.name,"ConnectionInfo",14)==0)
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{
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file_recovery->file_size=new_offset;
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return ;
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}
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} while(new_offset <= file_size_org && le32(block.size)!=0);
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file_recovery->file_size=offset;
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}
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/*@
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@ requires separation: \separated(&file_hint_che, 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_che(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_che.extension;
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file_recovery_new->min_filesize=0x19;
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file_recovery_new->file_check=&file_check_che;
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return 1;
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}
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static void register_header_check_che(file_stat_t *file_stat)
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{
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register_header_check(0, "Compucon EOS Design File", 24, &header_check_che, file_stat);
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}
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#endif
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