2 * unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
4 * Copyright (c) 2001-2003 Anton Altaparmakov
6 * This program/include file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program/include file is distributed in the hope that it will be
12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program (in the main directory of the Linux-NTFS
18 * distribution in the file COPYING); if not, write to the Free Software
19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * All these routines assume that the Unicode characters are in little endian
29 * encoding inside the strings!!!
33 * This is used by the name collation functions to quickly determine what
34 * characters are (in)valid.
36 static const u8 legal_ansi_char_array
[0x40] = {
37 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
38 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
40 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
41 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
43 0x17, 0x07, 0x18, 0x17, 0x17, 0x17, 0x17, 0x17,
44 0x17, 0x17, 0x18, 0x16, 0x16, 0x17, 0x07, 0x00,
46 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
47 0x17, 0x17, 0x04, 0x16, 0x18, 0x16, 0x18, 0x18,
51 * ntfs_are_names_equal - compare two Unicode names for equality
52 * @s1: name to compare to @s2
53 * @s1_len: length in Unicode characters of @s1
54 * @s2: name to compare to @s1
55 * @s2_len: length in Unicode characters of @s2
56 * @ic: ignore case bool
57 * @upcase: upcase table (only if @ic == IGNORE_CASE)
58 * @upcase_size: length in Unicode characters of @upcase (if present)
60 * Compare the names @s1 and @s2 and return TRUE (1) if the names are
61 * identical, or FALSE (0) if they are not identical. If @ic is IGNORE_CASE,
62 * the @upcase table is used to performa a case insensitive comparison.
64 BOOL
ntfs_are_names_equal(const uchar_t
*s1
, size_t s1_len
,
65 const uchar_t
*s2
, size_t s2_len
,
66 const IGNORE_CASE_BOOL ic
,
67 const uchar_t
*upcase
, const u32 upcase_size
)
71 if (ic
== CASE_SENSITIVE
)
72 return !ntfs_ucsncmp(s1
, s2
, s1_len
);
73 return !ntfs_ucsncasecmp(s1
, s2
, s1_len
, upcase
, upcase_size
);
77 * ntfs_collate_names - collate two Unicode names
78 * @name1: first Unicode name to compare
79 * @name2: second Unicode name to compare
80 * @err_val: if @name1 contains an invalid character return this value
81 * @ic: either CASE_SENSITIVE or IGNORE_CASE
82 * @upcase: upcase table (ignored if @ic is CASE_SENSITIVE)
83 * @upcase_len: upcase table size (ignored if @ic is CASE_SENSITIVE)
85 * ntfs_collate_names collates two Unicode names and returns:
87 * -1 if the first name collates before the second one,
88 * 0 if the names match,
89 * 1 if the second name collates before the first one, or
90 * @err_val if an invalid character is found in @name1 during the comparison.
92 * The following characters are considered invalid: '"', '*', '<', '>' and '?'.
94 int ntfs_collate_names(const uchar_t
*name1
, const u32 name1_len
,
95 const uchar_t
*name2
, const u32 name2_len
,
96 const int err_val
, const IGNORE_CASE_BOOL ic
,
97 const uchar_t
*upcase
, const u32 upcase_len
)
103 if (name1_len
> name2_len
)
105 for (cnt
= 0; cnt
< min_len
; ++cnt
) {
106 c1
= le16_to_cpu(*name1
++);
107 c2
= le16_to_cpu(*name2
++);
110 c1
= le16_to_cpu(upcase
[c1
]);
112 c2
= le16_to_cpu(upcase
[c2
]);
114 if (c1
< 64 && legal_ansi_char_array
[c1
] & 8)
121 if (name1_len
< name2_len
)
123 if (name1_len
== name2_len
)
125 /* name1_len > name2_len */
126 c1
= le16_to_cpu(*name1
);
127 if (c1
< 64 && legal_ansi_char_array
[c1
] & 8)
133 * ntfs_ucsncmp - compare two little endian Unicode strings
136 * @n: maximum unicode characters to compare
138 * Compare the first @n characters of the Unicode strings @s1 and @s2,
139 * The strings in little endian format and appropriate le16_to_cpu()
140 * conversion is performed on non-little endian machines.
142 * The function returns an integer less than, equal to, or greater than zero
143 * if @s1 (or the first @n Unicode characters thereof) is found, respectively,
144 * to be less than, to match, or be greater than @s2.
146 int ntfs_ucsncmp(const uchar_t
*s1
, const uchar_t
*s2
, size_t n
)
151 for (i
= 0; i
< n
; ++i
) {
152 c1
= le16_to_cpu(s1
[i
]);
153 c2
= le16_to_cpu(s2
[i
]);
165 * ntfs_ucsncasecmp - compare two little endian Unicode strings, ignoring case
168 * @n: maximum unicode characters to compare
169 * @upcase: upcase table
170 * @upcase_size: upcase table size in Unicode characters
172 * Compare the first @n characters of the Unicode strings @s1 and @s2,
173 * ignoring case. The strings in little endian format and appropriate
174 * le16_to_cpu() conversion is performed on non-little endian machines.
176 * Each character is uppercased using the @upcase table before the comparison.
178 * The function returns an integer less than, equal to, or greater than zero
179 * if @s1 (or the first @n Unicode characters thereof) is found, respectively,
180 * to be less than, to match, or be greater than @s2.
182 int ntfs_ucsncasecmp(const uchar_t
*s1
, const uchar_t
*s2
, size_t n
,
183 const uchar_t
*upcase
, const u32 upcase_size
)
188 for (i
= 0; i
< n
; ++i
) {
189 if ((c1
= le16_to_cpu(s1
[i
])) < upcase_size
)
190 c1
= le16_to_cpu(upcase
[c1
]);
191 if ((c2
= le16_to_cpu(s2
[i
])) < upcase_size
)
192 c2
= le16_to_cpu(upcase
[c2
]);
203 void ntfs_upcase_name(uchar_t
*name
, u32 name_len
, const uchar_t
*upcase
,
204 const u32 upcase_len
)
209 for (i
= 0; i
< name_len
; i
++)
210 if ((u
= le16_to_cpu(name
[i
])) < upcase_len
)
214 void ntfs_file_upcase_value(FILE_NAME_ATTR
*file_name_attr
,
215 const uchar_t
*upcase
, const u32 upcase_len
)
217 ntfs_upcase_name((uchar_t
*)&file_name_attr
->file_name
,
218 file_name_attr
->file_name_length
, upcase
, upcase_len
);
221 int ntfs_file_compare_values(FILE_NAME_ATTR
*file_name_attr1
,
222 FILE_NAME_ATTR
*file_name_attr2
,
223 const int err_val
, const IGNORE_CASE_BOOL ic
,
224 const uchar_t
*upcase
, const u32 upcase_len
)
226 return ntfs_collate_names((uchar_t
*)&file_name_attr1
->file_name
,
227 file_name_attr1
->file_name_length
,
228 (uchar_t
*)&file_name_attr2
->file_name
,
229 file_name_attr2
->file_name_length
,
230 err_val
, ic
, upcase
, upcase_len
);
234 * ntfs_nlstoucs - convert NLS string to little endian Unicode string
235 * @vol: ntfs volume which we are working with
236 * @ins: input NLS string buffer
237 * @ins_len: length of input string in bytes
238 * @outs: on return contains the allocated output Unicode string buffer
240 * Convert the input string @ins, which is in whatever format the loaded NLS
241 * map dictates, into a little endian, 2-byte Unicode string.
243 * This function allocates the string and the caller is responsible for
244 * calling kmem_cache_free(ntfs_name_cache, @outs); when finished with it.
246 * On success the function returns the number of Unicode characters written to
247 * the output string *@outs (>= 0), not counting the terminating Unicode NULL
248 * character. *@outs is set to the allocated output string buffer.
250 * On error, a negative number corresponding to the error code is returned. In
251 * that case the output string is not allocated. Both *@outs and *@outs_len
252 * are then undefined.
254 * This might look a bit odd due to fast path optimization...
256 int ntfs_nlstoucs(const ntfs_volume
*vol
, const char *ins
,
257 const int ins_len
, uchar_t
**outs
)
259 struct nls_table
*nls
= vol
->nls_map
;
264 /* We don't trust outside sources. */
266 ucs
= (uchar_t
*)kmem_cache_alloc(ntfs_name_cache
, SLAB_NOFS
);
268 for (i
= o
= 0; i
< ins_len
; i
+= wc_len
) {
269 wc_len
= nls
->char2uni(ins
+ i
, ins_len
- i
,
273 ucs
[o
++] = cpu_to_le16(wc
);
277 } /* else (wc_len < 0) */
280 ucs
[o
] = cpu_to_le16('\0');
284 ntfs_error(vol
->sb
, "Failed to allocate name from "
288 ntfs_error(NULL
, "Received NULL pointer.");
291 ntfs_error(vol
->sb
, "Name using character set %s contains characters "
292 "that cannot be converted to Unicode.", nls
->charset
);
293 kmem_cache_free(ntfs_name_cache
, ucs
);
298 * ntfs_ucstonls - convert little endian Unicode string to NLS string
299 * @vol: ntfs volume which we are working with
300 * @ins: input Unicode string buffer
301 * @ins_len: length of input string in Unicode characters
302 * @outs: on return contains the (allocated) output NLS string buffer
303 * @outs_len: length of output string buffer in bytes
305 * Convert the input little endian, 2-byte Unicode string @ins, of length
306 * @ins_len into the string format dictated by the loaded NLS.
308 * If @outs is NULL, this function allocates the string and the caller is
309 * responsible for calling kfree(@outs); when finished with it.
311 * On success the function returns the number of bytes written to the output
312 * string *@outs (>= 0), not counting the terminating NULL byte. If the output
313 * string buffer was allocated, *@outs is set to it.
315 * On error, a negative number corresponding to the error code is returned. In
316 * that case the output string is not allocated. The contents of *@outs are
319 * This might look a bit odd due to fast path optimization...
321 int ntfs_ucstonls(const ntfs_volume
*vol
, const uchar_t
*ins
,
322 const int ins_len
, unsigned char **outs
, int outs_len
)
324 struct nls_table
*nls
= vol
->nls_map
;
326 int i
, o
, ns_len
, wc
;
328 /* We don't trust outside sources. */
337 ns_len
= ins_len
* NLS_MAX_CHARSET_SIZE
;
338 ns
= (unsigned char*)kmalloc(ns_len
+ 1, GFP_NOFS
);
342 for (i
= o
= 0; i
< ins_len
; i
++) {
343 retry
: wc
= nls
->uni2char(le16_to_cpu(ins
[i
]), ns
+ o
,
350 else if (wc
== -ENAMETOOLONG
&& ns
!= *outs
) {
352 /* Grow in multiples of 64 bytes. */
353 tc
= (unsigned char*)kmalloc((ns_len
+ 64) &
356 memcpy(tc
, ns
, ns_len
);
357 ns_len
= ((ns_len
+ 64) & ~63) - 1;
361 } /* No memory so goto conversion_error; */
362 } /* wc < 0, real error. */
369 ntfs_error(vol
->sb
, "Received NULL pointer.");
372 ntfs_error(vol
->sb
, "Unicode name contains characters that cannot be "
373 "converted to character set %s.", nls
->charset
);
376 if (wc
!= -ENAMETOOLONG
)
380 ntfs_error(vol
->sb
, "Failed to allocate name!");