398 lines
12 KiB
C
398 lines
12 KiB
C
/*
|
|
* unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
|
|
*
|
|
* Copyright (c) 2001-2006 Anton Altaparmakov
|
|
*
|
|
* This program/include file 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/include file 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 (in the main directory of the Linux-NTFS
|
|
* distribution in the file COPYING); if not, write to the Free Software
|
|
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include "types.h"
|
|
#include "debug.h"
|
|
#include "ntfs.h"
|
|
|
|
/*
|
|
* IMPORTANT
|
|
* =========
|
|
*
|
|
* All these routines assume that the Unicode characters are in little endian
|
|
* encoding inside the strings!!!
|
|
*/
|
|
|
|
/*
|
|
* This is used by the name collation functions to quickly determine what
|
|
* characters are (in)valid.
|
|
*/
|
|
static const u8 legal_ansi_char_array[0x40] = {
|
|
0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
|
|
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
|
|
|
|
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
|
|
0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
|
|
|
|
0x17, 0x07, 0x18, 0x17, 0x17, 0x17, 0x17, 0x17,
|
|
0x17, 0x17, 0x18, 0x16, 0x16, 0x17, 0x07, 0x00,
|
|
|
|
0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
|
|
0x17, 0x17, 0x04, 0x16, 0x18, 0x16, 0x18, 0x18,
|
|
};
|
|
|
|
/**
|
|
* ntfs_are_names_equal - compare two Unicode names for equality
|
|
* @s1: name to compare to @s2
|
|
* @s1_len: length in Unicode characters of @s1
|
|
* @s2: name to compare to @s1
|
|
* @s2_len: length in Unicode characters of @s2
|
|
* @ic: ignore case bool
|
|
* @upcase: upcase table (only if @ic == IGNORE_CASE)
|
|
* @upcase_size: length in Unicode characters of @upcase (if present)
|
|
*
|
|
* Compare the names @s1 and @s2 and return 'true' (1) if the names are
|
|
* identical, or 'false' (0) if they are not identical. If @ic is IGNORE_CASE,
|
|
* the @upcase table is used to performa a case insensitive comparison.
|
|
*/
|
|
bool ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
|
|
const ntfschar *s2, size_t s2_len, const IGNORE_CASE_BOOL ic,
|
|
const ntfschar *upcase, const u32 upcase_size)
|
|
{
|
|
if (s1_len != s2_len)
|
|
return false;
|
|
if (ic == CASE_SENSITIVE)
|
|
return !ntfs_ucsncmp(s1, s2, s1_len);
|
|
return !ntfs_ucsncasecmp(s1, s2, s1_len, upcase, upcase_size);
|
|
}
|
|
|
|
/**
|
|
* ntfs_collate_names - collate two Unicode names
|
|
* @name1: first Unicode name to compare
|
|
* @name2: second Unicode name to compare
|
|
* @err_val: if @name1 contains an invalid character return this value
|
|
* @ic: either CASE_SENSITIVE or IGNORE_CASE
|
|
* @upcase: upcase table (ignored if @ic is CASE_SENSITIVE)
|
|
* @upcase_len: upcase table size (ignored if @ic is CASE_SENSITIVE)
|
|
*
|
|
* ntfs_collate_names collates two Unicode names and returns:
|
|
*
|
|
* -1 if the first name collates before the second one,
|
|
* 0 if the names match,
|
|
* 1 if the second name collates before the first one, or
|
|
* @err_val if an invalid character is found in @name1 during the comparison.
|
|
*
|
|
* The following characters are considered invalid: '"', '*', '<', '>' and '?'.
|
|
*/
|
|
int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
|
|
const ntfschar *name2, const u32 name2_len,
|
|
const int err_val, const IGNORE_CASE_BOOL ic,
|
|
const ntfschar *upcase, const u32 upcase_len)
|
|
{
|
|
u32 cnt, min_len;
|
|
u16 c1, c2;
|
|
|
|
min_len = name1_len;
|
|
if (name1_len > name2_len)
|
|
min_len = name2_len;
|
|
for (cnt = 0; cnt < min_len; ++cnt) {
|
|
c1 = le16_to_cpu(*name1++);
|
|
c2 = le16_to_cpu(*name2++);
|
|
if (ic) {
|
|
if (c1 < upcase_len)
|
|
c1 = le16_to_cpu(upcase[c1]);
|
|
if (c2 < upcase_len)
|
|
c2 = le16_to_cpu(upcase[c2]);
|
|
}
|
|
if (c1 < 64 && legal_ansi_char_array[c1] & 8)
|
|
return err_val;
|
|
if (c1 < c2)
|
|
return -1;
|
|
if (c1 > c2)
|
|
return 1;
|
|
}
|
|
if (name1_len < name2_len)
|
|
return -1;
|
|
if (name1_len == name2_len)
|
|
return 0;
|
|
/* name1_len > name2_len */
|
|
c1 = le16_to_cpu(*name1);
|
|
if (c1 < 64 && legal_ansi_char_array[c1] & 8)
|
|
return err_val;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* ntfs_ucsncmp - compare two little endian Unicode strings
|
|
* @s1: first string
|
|
* @s2: second string
|
|
* @n: maximum unicode characters to compare
|
|
*
|
|
* Compare the first @n characters of the Unicode strings @s1 and @s2,
|
|
* The strings in little endian format and appropriate le16_to_cpu()
|
|
* conversion is performed on non-little endian machines.
|
|
*
|
|
* The function returns an integer less than, equal to, or greater than zero
|
|
* if @s1 (or the first @n Unicode characters thereof) is found, respectively,
|
|
* to be less than, to match, or be greater than @s2.
|
|
*/
|
|
int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n)
|
|
{
|
|
u16 c1, c2;
|
|
size_t i;
|
|
|
|
for (i = 0; i < n; ++i) {
|
|
c1 = le16_to_cpu(s1[i]);
|
|
c2 = le16_to_cpu(s2[i]);
|
|
if (c1 < c2)
|
|
return -1;
|
|
if (c1 > c2)
|
|
return 1;
|
|
if (!c1)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ntfs_ucsncasecmp - compare two little endian Unicode strings, ignoring case
|
|
* @s1: first string
|
|
* @s2: second string
|
|
* @n: maximum unicode characters to compare
|
|
* @upcase: upcase table
|
|
* @upcase_size: upcase table size in Unicode characters
|
|
*
|
|
* Compare the first @n characters of the Unicode strings @s1 and @s2,
|
|
* ignoring case. The strings in little endian format and appropriate
|
|
* le16_to_cpu() conversion is performed on non-little endian machines.
|
|
*
|
|
* Each character is uppercased using the @upcase table before the comparison.
|
|
*
|
|
* The function returns an integer less than, equal to, or greater than zero
|
|
* if @s1 (or the first @n Unicode characters thereof) is found, respectively,
|
|
* to be less than, to match, or be greater than @s2.
|
|
*/
|
|
int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
|
|
const ntfschar *upcase, const u32 upcase_size)
|
|
{
|
|
size_t i;
|
|
u16 c1, c2;
|
|
|
|
for (i = 0; i < n; ++i) {
|
|
if ((c1 = le16_to_cpu(s1[i])) < upcase_size)
|
|
c1 = le16_to_cpu(upcase[c1]);
|
|
if ((c2 = le16_to_cpu(s2[i])) < upcase_size)
|
|
c2 = le16_to_cpu(upcase[c2]);
|
|
if (c1 < c2)
|
|
return -1;
|
|
if (c1 > c2)
|
|
return 1;
|
|
if (!c1)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void ntfs_upcase_name(ntfschar *name, u32 name_len, const ntfschar *upcase,
|
|
const u32 upcase_len)
|
|
{
|
|
u32 i;
|
|
u16 u;
|
|
|
|
for (i = 0; i < name_len; i++)
|
|
if ((u = le16_to_cpu(name[i])) < upcase_len)
|
|
name[i] = upcase[u];
|
|
}
|
|
|
|
void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
|
|
const ntfschar *upcase, const u32 upcase_len)
|
|
{
|
|
ntfs_upcase_name((ntfschar*)&file_name_attr->file_name,
|
|
file_name_attr->file_name_length, upcase, upcase_len);
|
|
}
|
|
|
|
int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
|
|
FILE_NAME_ATTR *file_name_attr2,
|
|
const int err_val, const IGNORE_CASE_BOOL ic,
|
|
const ntfschar *upcase, const u32 upcase_len)
|
|
{
|
|
return ntfs_collate_names((ntfschar*)&file_name_attr1->file_name,
|
|
file_name_attr1->file_name_length,
|
|
(ntfschar*)&file_name_attr2->file_name,
|
|
file_name_attr2->file_name_length,
|
|
err_val, ic, upcase, upcase_len);
|
|
}
|
|
|
|
/**
|
|
* ntfs_nlstoucs - convert NLS string to little endian Unicode string
|
|
* @vol: ntfs volume which we are working with
|
|
* @ins: input NLS string buffer
|
|
* @ins_len: length of input string in bytes
|
|
* @outs: on return contains the allocated output Unicode string buffer
|
|
*
|
|
* Convert the input string @ins, which is in whatever format the loaded NLS
|
|
* map dictates, into a little endian, 2-byte Unicode string.
|
|
*
|
|
* This function allocates the string and the caller is responsible for
|
|
* calling kmem_cache_free(ntfs_name_cache, *@outs); when finished with it.
|
|
*
|
|
* On success the function returns the number of Unicode characters written to
|
|
* the output string *@outs (>= 0), not counting the terminating Unicode NULL
|
|
* character. *@outs is set to the allocated output string buffer.
|
|
*
|
|
* On error, a negative number corresponding to the error code is returned. In
|
|
* that case the output string is not allocated. Both *@outs and *@outs_len
|
|
* are then undefined.
|
|
*
|
|
* This might look a bit odd due to fast path optimization...
|
|
*/
|
|
int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
|
|
const int ins_len, ntfschar **outs)
|
|
{
|
|
struct nls_table *nls = vol->nls_map;
|
|
ntfschar *ucs;
|
|
wchar_t wc;
|
|
int i, o, wc_len;
|
|
|
|
/* We do not trust outside sources. */
|
|
if (likely(ins)) {
|
|
ucs = kmem_cache_alloc(ntfs_name_cache, GFP_NOFS);
|
|
if (likely(ucs)) {
|
|
for (i = o = 0; i < ins_len; i += wc_len) {
|
|
wc_len = nls->char2uni(ins + i, ins_len - i,
|
|
&wc);
|
|
if (likely(wc_len >= 0 &&
|
|
o < NTFS_MAX_NAME_LEN)) {
|
|
if (likely(wc)) {
|
|
ucs[o++] = cpu_to_le16(wc);
|
|
continue;
|
|
} /* else if (!wc) */
|
|
break;
|
|
} /* else if (wc_len < 0 ||
|
|
o >= NTFS_MAX_NAME_LEN) */
|
|
goto name_err;
|
|
}
|
|
ucs[o] = 0;
|
|
*outs = ucs;
|
|
return o;
|
|
} /* else if (!ucs) */
|
|
ntfs_error(vol->sb, "Failed to allocate buffer for converted "
|
|
"name from ntfs_name_cache.");
|
|
return -ENOMEM;
|
|
} /* else if (!ins) */
|
|
ntfs_error(vol->sb, "Received NULL pointer.");
|
|
return -EINVAL;
|
|
name_err:
|
|
kmem_cache_free(ntfs_name_cache, ucs);
|
|
if (wc_len < 0) {
|
|
ntfs_error(vol->sb, "Name using character set %s contains "
|
|
"characters that cannot be converted to "
|
|
"Unicode.", nls->charset);
|
|
i = -EILSEQ;
|
|
} else /* if (o >= NTFS_MAX_NAME_LEN) */ {
|
|
ntfs_error(vol->sb, "Name is too long (maximum length for a "
|
|
"name on NTFS is %d Unicode characters.",
|
|
NTFS_MAX_NAME_LEN);
|
|
i = -ENAMETOOLONG;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* ntfs_ucstonls - convert little endian Unicode string to NLS string
|
|
* @vol: ntfs volume which we are working with
|
|
* @ins: input Unicode string buffer
|
|
* @ins_len: length of input string in Unicode characters
|
|
* @outs: on return contains the (allocated) output NLS string buffer
|
|
* @outs_len: length of output string buffer in bytes
|
|
*
|
|
* Convert the input little endian, 2-byte Unicode string @ins, of length
|
|
* @ins_len into the string format dictated by the loaded NLS.
|
|
*
|
|
* If *@outs is NULL, this function allocates the string and the caller is
|
|
* responsible for calling kfree(*@outs); when finished with it. In this case
|
|
* @outs_len is ignored and can be 0.
|
|
*
|
|
* On success the function returns the number of bytes written to the output
|
|
* string *@outs (>= 0), not counting the terminating NULL byte. If the output
|
|
* string buffer was allocated, *@outs is set to it.
|
|
*
|
|
* On error, a negative number corresponding to the error code is returned. In
|
|
* that case the output string is not allocated. The contents of *@outs are
|
|
* then undefined.
|
|
*
|
|
* This might look a bit odd due to fast path optimization...
|
|
*/
|
|
int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
|
|
const int ins_len, unsigned char **outs, int outs_len)
|
|
{
|
|
struct nls_table *nls = vol->nls_map;
|
|
unsigned char *ns;
|
|
int i, o, ns_len, wc;
|
|
|
|
/* We don't trust outside sources. */
|
|
if (ins) {
|
|
ns = *outs;
|
|
ns_len = outs_len;
|
|
if (ns && !ns_len) {
|
|
wc = -ENAMETOOLONG;
|
|
goto conversion_err;
|
|
}
|
|
if (!ns) {
|
|
ns_len = ins_len * NLS_MAX_CHARSET_SIZE;
|
|
ns = kmalloc(ns_len + 1, GFP_NOFS);
|
|
if (!ns)
|
|
goto mem_err_out;
|
|
}
|
|
for (i = o = 0; i < ins_len; i++) {
|
|
retry: wc = nls->uni2char(le16_to_cpu(ins[i]), ns + o,
|
|
ns_len - o);
|
|
if (wc > 0) {
|
|
o += wc;
|
|
continue;
|
|
} else if (!wc)
|
|
break;
|
|
else if (wc == -ENAMETOOLONG && ns != *outs) {
|
|
unsigned char *tc;
|
|
/* Grow in multiples of 64 bytes. */
|
|
tc = kmalloc((ns_len + 64) &
|
|
~63, GFP_NOFS);
|
|
if (tc) {
|
|
memcpy(tc, ns, ns_len);
|
|
ns_len = ((ns_len + 64) & ~63) - 1;
|
|
kfree(ns);
|
|
ns = tc;
|
|
goto retry;
|
|
} /* No memory so goto conversion_error; */
|
|
} /* wc < 0, real error. */
|
|
goto conversion_err;
|
|
}
|
|
ns[o] = 0;
|
|
*outs = ns;
|
|
return o;
|
|
} /* else (!ins) */
|
|
ntfs_error(vol->sb, "Received NULL pointer.");
|
|
return -EINVAL;
|
|
conversion_err:
|
|
ntfs_error(vol->sb, "Unicode name contains characters that cannot be "
|
|
"converted to character set %s. You might want to "
|
|
"try to use the mount option nls=utf8.", nls->charset);
|
|
if (ns != *outs)
|
|
kfree(ns);
|
|
if (wc != -ENAMETOOLONG)
|
|
wc = -EILSEQ;
|
|
return wc;
|
|
mem_err_out:
|
|
ntfs_error(vol->sb, "Failed to allocate name!");
|
|
return -ENOMEM;
|
|
}
|