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/*
File: file_lzh.c
Copyright (C) 2013 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_lzh)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include "types.h"
#include "filegen.h"
#include "log.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_lzh(file_stat_t *file_stat);
const file_hint_t file_hint_lzh= {
.extension="lzh",
.description="lzh/LArc archive",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_lzh
};
struct lzh_level0
{
uint8_t header_size;
uint8_t header_crc;
uint8_t method_id[5];
uint32_t comp_size;
uint32_t uncomp_size;
uint32_t file_time;
uint8_t attrib;
uint8_t level;
uint8_t filename_len;
/* Size should be 0, be carefull when using sizeof to decrement */
#ifndef DISABLED_FOR_FRAMAC
uint8_t filename[0];
#endif
} __attribute__ ((gcc_struct, __packed__));
struct lzh_level1
{
uint8_t header_size;
uint8_t header_crc;
uint8_t method_id[5];
uint32_t comp_size;
uint32_t uncomp_size;
uint32_t file_time;
uint8_t reserved_20;
uint8_t level;
uint8_t filename_len;
#ifndef DISABLED_FOR_FRAMAC
uint8_t filename[0];
#endif
} __attribute__ ((gcc_struct, __packed__));
struct lzh_level2
{
uint16_t header_size;
uint8_t method_id[5];
uint32_t comp_size;
uint32_t uncomp_size;
uint32_t file_time_unix;
uint8_t reserved;
uint8_t level;
uint16_t file_crc;
uint8_t os_id;
uint16_t next_header_size;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->file_rename==&file_rename_level0;
@ requires valid_file_rename_param(file_recovery);
@ ensures valid_file_rename_result(file_recovery);
@*/
static void file_rename_level0(file_recovery_t *file_recovery)
{
unsigned char buffer[512];
FILE *file;
size_t buffer_size;
unsigned int i;
const struct lzh_level0 *hdr=(const struct lzh_level0 *)&buffer;
const char *fn=(const char *)hdr + sizeof(struct lzh_level0);
if((file=fopen(file_recovery->filename, "rb"))==NULL)
return;
buffer_size=fread(buffer, 1, sizeof(buffer), file);
fclose(file);
if(buffer_size < sizeof(struct lzh_level0))
return;
if(buffer_size < sizeof(struct lzh_level0) + hdr->filename_len)
return;
/*@ assert sizeof(struct lzh_level0) + hdr->filename_len <= buffer_size; */
/*@
@ loop invariant 0 <= i <= hdr->filename_len;
@ loop assigns i;
@ loop variant hdr->filename_len - i;
@*/
for(i=0; i< hdr->filename_len && fn[i]!=0 && fn[i]!='.'; i++);
/*@ assert 0 <= i <= hdr->filename_len; */
file_rename(file_recovery, fn, i, 0, NULL, 1);
}
/*@
@ requires buffer_size >= sizeof(struct lzh_level0);
@ requires buffer_size >= sizeof(struct lzh_level1);
@ requires separation: \separated(&file_hint_lzh, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_lzh(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)
{
switch(buffer[20])
{
/* Level 0 */
case 0:
{
const struct lzh_level0 *hdr=(const struct lzh_level0 *)buffer;
if(hdr->header_size!=22+hdr->filename_len)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_lzh.extension;
file_recovery_new->file_rename=&file_rename_level0;
return 1;
}
/* Level 1 */
case 1:
{
const struct lzh_level1 *hdr=(const struct lzh_level1 *)buffer;
if(hdr->reserved_20!=0x20)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_lzh.extension;
return 1;
}
/* Level 2 */
case 2:
{
// const struct lzh_level2 *hdr=(const struct lzh_level2 *)buffer;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_lzh.extension;
return 1;
}
}
return 0;
}
static void register_header_check_lzh(file_stat_t *file_stat)
{
register_header_check(2, "-lh0-", 5, &header_check_lzh, file_stat);
#ifndef DISABLED_FOR_FRAMAC
register_header_check(2, "-lh1-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lh2-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lh3-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lh4-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lh5-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lh6-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lh7-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lhd-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lzs-", 5, &header_check_lzh, file_stat);
register_header_check(2, "-lz4-", 5, &header_check_lzh, file_stat);
#endif
}
#endif
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