97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/*
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File: file_hdr.c
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Copyright (C) 2015 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_hdr)
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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(file_stat); */
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static void register_header_check_hdr(file_stat_t *file_stat);
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const file_hint_t file_hint_hdr= {
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.extension="hdr",
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.description="InstallShield",
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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_hdr
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};
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struct hdr_header {
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uint32_t magic;
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uint16_t unk1;
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uint16_t val0100;
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uint32_t val00000000;
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uint16_t val0200;
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uint16_t val0000;
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uint16_t unk2; /* 0 if cab */
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uint16_t val0000_bis;
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uint32_t filesize; /* 0x200 if cab */
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uint32_t val00000000_bis;
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires buffer_size >= sizeof(struct hdr_header);
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@ requires \valid_read(buffer+(0..buffer_size-1));
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@ requires valid_file_recovery(file_recovery);
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@ requires \valid(file_recovery_new);
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@ requires file_recovery_new->blocksize > 0;
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@ requires separation: \separated(&file_hint_hdr, buffer+(..), file_recovery, file_recovery_new);
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@ ensures \result == 0 || \result == 1;
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@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_hdr(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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const struct hdr_header *hdr=(const struct hdr_header*)buffer;
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const unsigned int filesize=le32(hdr->filesize);
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if(le16(hdr->val0100)!=0x100)
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return 0;
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if(le32(hdr->val00000000)!=0)
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return 0;
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reset_file_recovery(file_recovery_new);
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if(le16(hdr->unk2)==0 && filesize==0x200)
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{
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file_recovery_new->extension="cab";
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file_recovery_new->min_filesize=0x200;
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return 1;
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}
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file_recovery_new->extension=file_hint_hdr.extension;
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file_recovery_new->calculated_file_size=filesize;
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file_recovery_new->data_check=&data_check_size;
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file_recovery_new->file_check=&file_check_size;
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return 1;
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}
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static void register_header_check_hdr(file_stat_t *file_stat)
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{
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register_header_check(0, "ISc(", 4, &header_check_hdr, file_stat);
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}
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#endif
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