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/*
* VBSF - Long File Name support
* Copyright (C) 2011-2022 Eduardo Casino
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General 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 License for more details.
*
* You should have received a copy of the GNU General License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef LFN_H
#define LFN_H
#include <stdint.h>
#include "unicode.h"
#include "vboxshfl.h"
#include "sftsr.h"
#define REVERSE_HASH 1
static inline bool translate_filename_from_host(SHFLSTRING *, bool, bool);
static bool matches_8_3_wildcard(const char __far *, const char __far *);
static int my_strrchr(const char __far *, char);
/** Private buffer for resolving VirtualBox long filenames. */
static SHFLSTRING_WITH_BUF(shflstrlfn, SHFL_MAX_LEN);
static char fcb_name[12];
static char __far *_fstrchr_local(const char __far *str, char c)
{
int i;
for (i = 0; str[i] != '\0' && str[i] != c; ++i)
;
return (char __far *)&str[i];
}
static inline char __far *_fstrrchr_local(const char __far *str, char c)
{
int i;
for (i = 0; str[i] != '\0'; ++i)
;
for (; i && str[i] != c; --i)
;
return (char __far *)&str[i];
}
/** Like strcpy, but returns a pointer to the new last char in dst (a NULL). */
static inline char *_fstrcpy_local(char *dst, const char __far *src)
{
while (*dst++ = *src++)
;
return dst - 1;
}
static inline char hex_digit(uint8_t val)
{
return val > 9 ? val + 55 : val + 48;
}
/*
* NOTE: The hash algorithm is from sdbm, a public domain clone of ndbm
* by Ozan Yigit (http://www.cse.yorku.ca/~oz/), with the result
* folded to the desired hash lengh (method from
* http://isthe.com/chongo/tech/comp/fnv). Hence, lfn_name_hash() is
* also in the PUBLIC DOMAIN. (The actual code is fom the version
* included in gawk, which uses bit rotations instead of
* multiplications)
*/
#define FOLD_MASK(x) (((uint32_t)1 << (x)) - 1)
/** Calculates and returns hash_len bits length hash */
static uint32_t lfn_name_hash(
uint8_t *name, // in : File name in UTF-8
uint16_t len, // in : File name length
uint8_t hash_chars // in: Number of characters for hash part
)
{
uint8_t *be = name + len; /* beyond end of buffer */
uint32_t hval = 0;
uint8_t hash_len = hash_chars << 2;
while (name < be)
{
/* It seems that calculating the hash backwards gives an slightly
* better dispersion for files with names which are the same in their
* first part ( like image_000001.jpg, image_000002.jpg, ... )
*/
#ifdef REVERSE_HASH
hval = *--be + (hval << 6) + (hval << 16) - hval;
#else
hval = *name++ + (hval << 6) + (hval << 16) - hval;
#endif
}
// Fold result to the desired len
hval = (((hval >> hash_len) ^ hval) & FOLD_MASK(hash_len));
return hval;
}
// Generates a valid (and hopefully unique) 8.3 DOS path from an LFN
// This function assumes that fname is already in DOS character set
//
static void mangle_to_8_3_filename(
uint32_t hash, // in : Pre-calculated hash of the filename in UTF-8
uint8_t hash_chars, // in: Number of characters for hash part
char __far *fcb_name, // out : File name in FCB format. Must be 11 bytes long
SHFLSTRING *str // in : File name in DOS codepage
)
{
char *d, *p, __far *s, *fname = str->ach;
int i;
uint8_t mangle = hash_chars;
static int ror[] = {0, 4, 8, 12, 16, 20};
*(uint32_t __far *)(&fcb_name[0]) = 0x20202020;
*(uint32_t __far *)(&fcb_name[4]) = 0x20202020;
*(uint16_t __far *)(&fcb_name[8]) = 0X2020;
*(uint8_t __far *)(&fcb_name[10]) = 0X20;
// First, skip leading dots and spaces
//
while (*fname == ' ' || *fname == '.')
{
++fname;
}
// Then look for the last dot in the filename
//
d = p = (char *)_fstrrchr_local(fname, '.');
// There is an extension
//
if (p != fname)
{
*p = '\0';
i = 0;
s = &fcb_name[8];
while (*++p != '\0' && i < 3)
{
if (*p != ' ')
{
*s++ = illegal_char(*p) ? '_' : nls_toupper(*p);
++i;
}
}
}
i = 0;
s = fcb_name;
p = fname;
while (*p && i < 8)
{
if (*p != ' ' && *p != '.')
{
*s++ = illegal_char(*p) ? '_' : nls_toupper(*p);
++i;
}
++p;
}
if (*d == '\0')
{
*d = '.';
}
// It is 7 because 1 char is for the tilde '~'
//
if (i > 7 - mangle)
{
i = 7 - mangle;
}
fcb_name[i] = '~';
while (mangle--)
{
fcb_name[++i] = hex_digit((hash >> ror[mangle]) & 0xf);
}
}
static inline bool match_to_8_3_filename(const char __far *dos_filename, const char *fcb_name)
{
int len;
for (len = 0; dos_filename[len] != '.' && dos_filename[len] != '\0' && len < 8; ++len)
{
if (dos_filename[len] != fcb_name[len])
{
return false;
}
}
// No extension
if (dos_filename[len] == '\0')
{
while (len < 11)
{
if (fcb_name[len++] != ' ')
{
return false;
}
}
return true;
}
if (dos_filename[len] == '.')
{
int len2 = len + 1;
while (len < 8)
{
if (fcb_name[len++] != ' ')
{
return false;
}
}
while (dos_filename[len2] != '\0' && len < 11)
{
if (dos_filename[len2++] != fcb_name[len++])
{
return false;
}
}
while (len < 11)
{
if (fcb_name[len++] != ' ')
{
return false;
}
}
return true;
}
// Should not reach here
return false;
}
static inline char *find_real_name(
TSRDATAPTR data,
int drive,
char *dest, // out : destination buffer
char __far *path, // in : search path
char __far *filename, // in : DOS file name
uint16_t namelen, // in : file name length
uint16_t bufsiz // in : buffer size
)
{
SHFLROOT root = data->drives[drive].root;
uint8_t hash_chars = data->drives[drive].opt.hash_chars;
vboxerr err;
dprintf("find_real_name path=%Fs filename=%Fs\n", path, filename);
memset(&parms.create, 0, sizeof(SHFLCREATEPARMS));
parms.create.CreateFlags = SHFL_CF_DIRECTORY | SHFL_CF_ACT_OPEN_IF_EXISTS | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
shflstring_strcpy(&shflstrlfn.shflstr, path);
err = vbox_shfl_open(&data->vb, data->hgcm_client_id, root, &shflstrlfn.shflstr, &parms.create);
if (err)
{
dputs("open search dir failed");
goto not_found;
}
// Check there is room for appending "\*" to the path
if (shflstrlfn.shflstr.u16Size < shflstrlfn.shflstr.u16Length + 2)
{
dputs("path too long");
vbox_shfl_close(&data->vb, data->hgcm_client_id, root, parms.create.Handle);
goto not_found;
}
*(uint16_t *)&shflstrlfn.shflstr.ach[shflstrlfn.shflstr.u16Length] = '*\\';
shflstrlfn.shflstr.u16Length += 2;
shflstrlfn.shflstr.ach[shflstrlfn.shflstr.u16Length] = '\0';
for (;;)
{
unsigned size = sizeof(shfldirinfo), resume = 0, count = 0;
char *d;
uint32_t hash;
bool valid;
err = vbox_shfl_list(&data->vb, data->hgcm_client_id, root, parms.create.Handle,
SHFL_LIST_RETURN_ONE, &size, &shflstrlfn.shflstr, &shfldirinfo.dirinfo,
&resume, &count);
// Reset the size of the buffer
shfldirinfo.dirinfo.name.u16Size = sizeof(shfldirinfo.buf);
if (err)
{
dputs("vbox_shfl_list() failed");
vbox_shfl_close(&data->vb, data->hgcm_client_id, root, parms.create.Handle);
break;
}
// Calculate hash using host file name
hash = lfn_name_hash(shfldirinfo.dirinfo.name.ach, shfldirinfo.dirinfo.name.u16Length, hash_chars);
// Copy now, because translate_filename_from_host() converts fName to DOS codepage
//
if (shfldirinfo.dirinfo.name.u16Length > bufsiz)
{
vbox_shfl_close(&data->vb, data->hgcm_client_id, root, parms.create.Handle);
return (char *)0;
}
d = _fstrcpy_local(dest, &shfldirinfo.dirinfo.name.ach);
translate_filename_from_host(&shfldirinfo.dirinfo.name, false, true);
mangle_to_8_3_filename(hash, hash_chars, fcb_name, &shfldirinfo.dirinfo.name);
if (match_to_8_3_filename(filename, fcb_name))
{
vbox_shfl_close(&data->vb, data->hgcm_client_id, root, parms.create.Handle);
return d;
}
}
not_found:
if (namelen > bufsiz)
{
return (char *)0;
}
else
{
return _fstrcpy_local(dest, filename);
}
}
static uint16_t get_true_host_name_n(TSRDATAPTR data, int drive, uint8_t *dst, char __far *src, uint16_t buflen, uint16_t count)
{
char __far *s, *d;
char __far *tl, __far *ps, __far *ns, save_ns, save_end;
uint16_t ret, len = 0;
if (!data->drives[drive].opt.generate_sfn)
{
return local_to_utf8_n(data, dst, src, buflen, count);
}
if (count < buflen)
{
save_end = src[count];
src[count] = '\0';
}
dprintf("get_true_host_name_n() src: %Fs\n", src);
s = src;
d = dst;
tl = _fstrchr_local(src, '~');
while (*tl != '\0')
{
// tl
// |
// ps ---+ | +--- ns
// | | |
// /path/fil~enam/
// 0123456789
*tl = '\0';
ps = _fstrrchr_local(s, '\\');
*tl = '~';
ns = _fstrchr_local(tl, '\\');
save_ns = *ns; // Can be '\\' or '\0'
*ps = *ns = '\0';
ret = local_to_utf8(data, d, s, buflen - len);
d += ret;
len += ret;
if (buflen <= len)
{
goto return_name;
}
*d++ = '\\';
*d = '\0';
++len;
d = find_real_name(data, drive, d, dst, ps + 1, (uint16_t)(ns - ps + 1), buflen - len);
if (d == (char *)0)
{
goto return_name;
}
len = (uint16_t)(d - dst);
*d = '\0';
*ps = '\\';
*ns = save_ns;
tl = _fstrchr_local(ns, '~');
s = ns;
}
len += local_to_utf8(data, d, s, buflen - len);
return_name:
if (count < buflen)
{
src[count] = save_end;
}
dprintf("True host name: '%s', len: %d\n", dst, len);
return len;
}
static inline uint16_t get_true_host_name(TSRDATAPTR data, int drive, uint8_t *dst, char __far *src, uint16_t buflen)
{
return get_true_host_name_n(data, drive, dst, src, buflen, buflen);
}
#endif // LFN_H
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