122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/*
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File: file_abr.c
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Copyright (C) 2012,2016 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_abr)
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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 <assert.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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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_abr(file_stat_t *file_stat);
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struct abr_header
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{
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char magic[4];
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char info[4];
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uint32_t size;
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} __attribute__ ((gcc_struct, __packed__));
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const file_hint_t file_hint_abr= {
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.extension="abr",
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.description="Adobe Brush",
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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_abr
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};
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/*@
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@ requires file_recovery->data_check==&data_check_abr;
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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_abr(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@
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@ loop assigns file_recovery->calculated_file_size;
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@*/
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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 12 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
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/*@ assert 0 <= i < buffer_size - 12 ; */
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const struct abr_header *hdr=(const struct abr_header*)&buffer[i];
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/*@ assert \valid_read(hdr); */
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if(memcmp(hdr->magic, "8BIM", 4)!=0)
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return DC_STOP;
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file_recovery->calculated_file_size+=(uint64_t)12 + be32(hdr->size);
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}
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return DC_CONTINUE;
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}
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/*@
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@ requires buffer_size >= 4 + sizeof(struct abr_header) ;
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@ requires separation: \separated(&file_hint_abr, 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_abr(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 abr_header *hdr=(const struct abr_header*)&buffer[4];
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uint64_t i=4;
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assert(buffer_size >= 12);
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/*@
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@ loop assigns i;
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@*/
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while(i < buffer_size - 12 && i < 512 - 12)
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{
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const struct abr_header *h=(const struct abr_header*)&buffer[i];
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if(memcmp(h->magic, "8BIM", 4)!=0)
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return 0;
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i+=(uint64_t)12 + be32(h->size);
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}
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_abr.extension;
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file_recovery_new->min_filesize=(uint64_t)4+12+be32(hdr->size);
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file_recovery_new->calculated_file_size=(uint64_t)4+12+be32(hdr->size);
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if(file_recovery_new->blocksize < 12)
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return 1;
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file_recovery_new->data_check=&data_check_abr;
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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_abr(file_stat_t *file_stat)
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{
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static const unsigned char abr_header[11]= {
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0x00, 0x02, '8' , 'B' , 'I' , 'M' , 's' , 'a' ,
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'm' , 'p' , 0x00
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};
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register_header_check(2, abr_header, sizeof(abr_header), &header_check_abr, file_stat);
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}
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#endif
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