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/*
File: file_a.c
Copyright (C) 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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_a)
#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"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_a(file_stat_t *file_stat);
const file_hint_t file_hint_a= {
.extension="a",
.description="Unix Archive/Debian package",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_a
};
struct file_header
{
char name[16];
char mtime[12];
char uid[6];
char gid[6];
char mode[8];
char size[10];
char magic[2];
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size >= 8 + sizeof(struct file_header);
@ requires separation: \separated(&file_hint_a, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_a(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 const unsigned char a_header_debian[14] = { '!','<','a','r','c','h','>','\n','d','e','b','i','a','n'};
static const char magic[2]= { 0x60, 0x0a};
const struct file_header *fh=(const struct file_header *)&buffer[8];
if(memcmp(fh->magic, magic, 2)!=0)
return 0;
/* http://en.wikipedia.org/wiki/Ar_%28Unix%29 */
reset_file_recovery(file_recovery_new);
if(memcmp(buffer,a_header_debian,sizeof(a_header_debian))==0)
file_recovery_new->extension="deb";
else
file_recovery_new->extension=file_hint_a.extension;
return 1;
}
static void register_header_check_a(file_stat_t *file_stat)
{
static const unsigned char a_header[8] = { '!','<','a','r','c','h','>','\n'};
register_header_check(0, a_header,sizeof(a_header), &header_check_a, file_stat);
}
#endif
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