1/*
2 * linux/fs/nls/nls_base.c
3 *
4 * Native language support--charsets and unicode translations.
5 * By Gordon Chaffee 1996, 1997
6 *
7 * Unicode based case conversion 1999 by Wolfram Pienkoss
8 *
9 */
10
11#include <linux/module.h>
12#include <linux/string.h>
13#include <linux/nls.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/kmod.h>
17#include <linux/spinlock.h>
18#include <asm/byteorder.h>
19
20static struct nls_table default_table;
21static struct nls_table *tables = &default_table;
22static DEFINE_SPINLOCK(nls_lock);
23
24/*
25 * Sample implementation from Unicode home page.
26 * http://www.stonehand.com/unicode/standard/fss-utf.html
27 */
28struct utf8_table {
29 int cmask;
30 int cval;
31 int shift;
32 long lmask;
33 long lval;
34};
35
36static const struct utf8_table utf8_table[] =
37{
38 {0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
39 {.cmask: 0xE0, .cval: 0xC0, .shift: 1*6, .lmask: 0x7FF, .lval: 0x80, /* 2 byte sequence */},
40 {.cmask: 0xF0, .cval: 0xE0, .shift: 2*6, .lmask: 0xFFFF, .lval: 0x800, /* 3 byte sequence */},
41 {.cmask: 0xF8, .cval: 0xF0, .shift: 3*6, .lmask: 0x1FFFFF, .lval: 0x10000, /* 4 byte sequence */},
42 {.cmask: 0xFC, .cval: 0xF8, .shift: 4*6, .lmask: 0x3FFFFFF, .lval: 0x200000, /* 5 byte sequence */},
43 {.cmask: 0xFE, .cval: 0xFC, .shift: 5*6, .lmask: 0x7FFFFFFF, .lval: 0x4000000, /* 6 byte sequence */},
44 {0, /* end of table */}
45};
46
47#define UNICODE_MAX 0x0010ffff
48#define PLANE_SIZE 0x00010000
49
50#define SURROGATE_MASK 0xfffff800
51#define SURROGATE_PAIR 0x0000d800
52#define SURROGATE_LOW 0x00000400
53#define SURROGATE_BITS 0x000003ff
54
55int utf8_to_utf32(const u8 *s, int inlen, unicode_t *pu)
56{
57 unsigned long l;
58 int c0, c, nc;
59 const struct utf8_table *t;
60
61 nc = 0;
62 c0 = *s;
63 l = c0;
64 for (t = utf8_table; t->cmask; t++) {
65 nc++;
66 if ((c0 & t->cmask) == t->cval) {
67 l &= t->lmask;
68 if (l < t->lval || l > UNICODE_MAX ||
69 (l & SURROGATE_MASK) == SURROGATE_PAIR)
70 return -1;
71 *pu = (unicode_t) l;
72 return nc;
73 }
74 if (inlen <= nc)
75 return -1;
76 s++;
77 c = (*s ^ 0x80) & 0xFF;
78 if (c & 0xC0)
79 return -1;
80 l = (l << 6) | c;
81 }
82 return -1;
83}
84EXPORT_SYMBOL(utf8_to_utf32);
85
86int utf32_to_utf8(unicode_t u, u8 *s, int maxout)
87{
88 unsigned long l;
89 int c, nc;
90 const struct utf8_table *t;
91
92 if (!s)
93 return 0;
94
95 l = u;
96 if (l > UNICODE_MAX || (l & SURROGATE_MASK) == SURROGATE_PAIR)
97 return -1;
98
99 nc = 0;
100 for (t = utf8_table; t->cmask && maxout; t++, maxout--) {
101 nc++;
102 if (l <= t->lmask) {
103 c = t->shift;
104 *s = (u8) (t->cval | (l >> c));
105 while (c > 0) {
106 c -= 6;
107 s++;
108 *s = (u8) (0x80 | ((l >> c) & 0x3F));
109 }
110 return nc;
111 }
112 }
113 return -1;
114}
115EXPORT_SYMBOL(utf32_to_utf8);
116
117static inline void put_utf16(wchar_t *s, unsigned c, enum utf16_endian endian)
118{
119 switch (endian) {
120 default:
121 *s = (wchar_t) c;
122 break;
123 case UTF16_LITTLE_ENDIAN:
124 *s = __cpu_to_le16(c);
125 break;
126 case UTF16_BIG_ENDIAN:
127 *s = __cpu_to_be16(c);
128 break;
129 }
130}
131
132int utf8s_to_utf16s(const u8 *s, int inlen, enum utf16_endian endian,
133 wchar_t *pwcs, int maxout)
134{
135 u16 *op;
136 int size;
137 unicode_t u;
138
139 op = pwcs;
140 while (inlen > 0 && maxout > 0 && *s) {
141 if (*s & 0x80) {
142 size = utf8_to_utf32(s, inlen, &u);
143 if (size < 0)
144 return -EINVAL;
145 s += size;
146 inlen -= size;
147
148 if (u >= PLANE_SIZE) {
149 if (maxout < 2)
150 break;
151 u -= PLANE_SIZE;
152 put_utf16(s: op++, SURROGATE_PAIR |
153 ((u >> 10) & SURROGATE_BITS),
154 endian);
155 put_utf16(s: op++, SURROGATE_PAIR |
156 SURROGATE_LOW |
157 (u & SURROGATE_BITS),
158 endian);
159 maxout -= 2;
160 } else {
161 put_utf16(s: op++, c: u, endian);
162 maxout--;
163 }
164 } else {
165 put_utf16(s: op++, c: *s++, endian);
166 inlen--;
167 maxout--;
168 }
169 }
170 return op - pwcs;
171}
172EXPORT_SYMBOL(utf8s_to_utf16s);
173
174static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
175{
176 switch (endian) {
177 default:
178 return c;
179 case UTF16_LITTLE_ENDIAN:
180 return __le16_to_cpu(c);
181 case UTF16_BIG_ENDIAN:
182 return __be16_to_cpu(c);
183 }
184}
185
186int utf16s_to_utf8s(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
187 u8 *s, int maxout)
188{
189 u8 *op;
190 int size;
191 unsigned long u, v;
192
193 op = s;
194 while (inlen > 0 && maxout > 0) {
195 u = get_utf16(c: *pwcs, endian);
196 if (!u)
197 break;
198 pwcs++;
199 inlen--;
200 if (u > 0x7f) {
201 if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
202 if (u & SURROGATE_LOW) {
203 /* Ignore character and move on */
204 continue;
205 }
206 if (inlen <= 0)
207 break;
208 v = get_utf16(c: *pwcs, endian);
209 if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
210 !(v & SURROGATE_LOW)) {
211 /* Ignore character and move on */
212 continue;
213 }
214 u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
215 + (v & SURROGATE_BITS);
216 pwcs++;
217 inlen--;
218 }
219 size = utf32_to_utf8(u, op, maxout);
220 if (size == -1) {
221 /* Ignore character and move on */
222 } else {
223 op += size;
224 maxout -= size;
225 }
226 } else {
227 *op++ = (u8) u;
228 maxout--;
229 }
230 }
231 return op - s;
232}
233EXPORT_SYMBOL(utf16s_to_utf8s);
234
235int __register_nls(struct nls_table *nls, struct module *owner)
236{
237 struct nls_table ** tmp = &tables;
238
239 if (nls->next)
240 return -EBUSY;
241
242 nls->owner = owner;
243 spin_lock(lock: &nls_lock);
244 while (*tmp) {
245 if (nls == *tmp) {
246 spin_unlock(lock: &nls_lock);
247 return -EBUSY;
248 }
249 tmp = &(*tmp)->next;
250 }
251 nls->next = tables;
252 tables = nls;
253 spin_unlock(lock: &nls_lock);
254 return 0;
255}
256EXPORT_SYMBOL(__register_nls);
257
258int unregister_nls(struct nls_table * nls)
259{
260 struct nls_table ** tmp = &tables;
261
262 spin_lock(lock: &nls_lock);
263 while (*tmp) {
264 if (nls == *tmp) {
265 *tmp = nls->next;
266 spin_unlock(lock: &nls_lock);
267 return 0;
268 }
269 tmp = &(*tmp)->next;
270 }
271 spin_unlock(lock: &nls_lock);
272 return -EINVAL;
273}
274
275static struct nls_table *find_nls(const char *charset)
276{
277 struct nls_table *nls;
278 spin_lock(lock: &nls_lock);
279 for (nls = tables; nls; nls = nls->next) {
280 if (!strcmp(nls->charset, charset))
281 break;
282 if (nls->alias && !strcmp(nls->alias, charset))
283 break;
284 }
285 if (nls && !try_module_get(module: nls->owner))
286 nls = NULL;
287 spin_unlock(lock: &nls_lock);
288 return nls;
289}
290
291struct nls_table *load_nls(const char *charset)
292{
293 return try_then_request_module(find_nls(charset), "nls_%s", charset);
294}
295
296void unload_nls(struct nls_table *nls)
297{
298 if (nls)
299 module_put(module: nls->owner);
300}
301
302static const wchar_t charset2uni[256] = {
303 /* 0x00*/
304 0x0000, 0x0001, 0x0002, 0x0003,
305 0x0004, 0x0005, 0x0006, 0x0007,
306 0x0008, 0x0009, 0x000a, 0x000b,
307 0x000c, 0x000d, 0x000e, 0x000f,
308 /* 0x10*/
309 0x0010, 0x0011, 0x0012, 0x0013,
310 0x0014, 0x0015, 0x0016, 0x0017,
311 0x0018, 0x0019, 0x001a, 0x001b,
312 0x001c, 0x001d, 0x001e, 0x001f,
313 /* 0x20*/
314 0x0020, 0x0021, 0x0022, 0x0023,
315 0x0024, 0x0025, 0x0026, 0x0027,
316 0x0028, 0x0029, 0x002a, 0x002b,
317 0x002c, 0x002d, 0x002e, 0x002f,
318 /* 0x30*/
319 0x0030, 0x0031, 0x0032, 0x0033,
320 0x0034, 0x0035, 0x0036, 0x0037,
321 0x0038, 0x0039, 0x003a, 0x003b,
322 0x003c, 0x003d, 0x003e, 0x003f,
323 /* 0x40*/
324 0x0040, 0x0041, 0x0042, 0x0043,
325 0x0044, 0x0045, 0x0046, 0x0047,
326 0x0048, 0x0049, 0x004a, 0x004b,
327 0x004c, 0x004d, 0x004e, 0x004f,
328 /* 0x50*/
329 0x0050, 0x0051, 0x0052, 0x0053,
330 0x0054, 0x0055, 0x0056, 0x0057,
331 0x0058, 0x0059, 0x005a, 0x005b,
332 0x005c, 0x005d, 0x005e, 0x005f,
333 /* 0x60*/
334 0x0060, 0x0061, 0x0062, 0x0063,
335 0x0064, 0x0065, 0x0066, 0x0067,
336 0x0068, 0x0069, 0x006a, 0x006b,
337 0x006c, 0x006d, 0x006e, 0x006f,
338 /* 0x70*/
339 0x0070, 0x0071, 0x0072, 0x0073,
340 0x0074, 0x0075, 0x0076, 0x0077,
341 0x0078, 0x0079, 0x007a, 0x007b,
342 0x007c, 0x007d, 0x007e, 0x007f,
343 /* 0x80*/
344 0x0080, 0x0081, 0x0082, 0x0083,
345 0x0084, 0x0085, 0x0086, 0x0087,
346 0x0088, 0x0089, 0x008a, 0x008b,
347 0x008c, 0x008d, 0x008e, 0x008f,
348 /* 0x90*/
349 0x0090, 0x0091, 0x0092, 0x0093,
350 0x0094, 0x0095, 0x0096, 0x0097,
351 0x0098, 0x0099, 0x009a, 0x009b,
352 0x009c, 0x009d, 0x009e, 0x009f,
353 /* 0xa0*/
354 0x00a0, 0x00a1, 0x00a2, 0x00a3,
355 0x00a4, 0x00a5, 0x00a6, 0x00a7,
356 0x00a8, 0x00a9, 0x00aa, 0x00ab,
357 0x00ac, 0x00ad, 0x00ae, 0x00af,
358 /* 0xb0*/
359 0x00b0, 0x00b1, 0x00b2, 0x00b3,
360 0x00b4, 0x00b5, 0x00b6, 0x00b7,
361 0x00b8, 0x00b9, 0x00ba, 0x00bb,
362 0x00bc, 0x00bd, 0x00be, 0x00bf,
363 /* 0xc0*/
364 0x00c0, 0x00c1, 0x00c2, 0x00c3,
365 0x00c4, 0x00c5, 0x00c6, 0x00c7,
366 0x00c8, 0x00c9, 0x00ca, 0x00cb,
367 0x00cc, 0x00cd, 0x00ce, 0x00cf,
368 /* 0xd0*/
369 0x00d0, 0x00d1, 0x00d2, 0x00d3,
370 0x00d4, 0x00d5, 0x00d6, 0x00d7,
371 0x00d8, 0x00d9, 0x00da, 0x00db,
372 0x00dc, 0x00dd, 0x00de, 0x00df,
373 /* 0xe0*/
374 0x00e0, 0x00e1, 0x00e2, 0x00e3,
375 0x00e4, 0x00e5, 0x00e6, 0x00e7,
376 0x00e8, 0x00e9, 0x00ea, 0x00eb,
377 0x00ec, 0x00ed, 0x00ee, 0x00ef,
378 /* 0xf0*/
379 0x00f0, 0x00f1, 0x00f2, 0x00f3,
380 0x00f4, 0x00f5, 0x00f6, 0x00f7,
381 0x00f8, 0x00f9, 0x00fa, 0x00fb,
382 0x00fc, 0x00fd, 0x00fe, 0x00ff,
383};
384
385static const unsigned char page00[256] = {
386 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
387 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
388 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
389 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
390 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
391 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
392 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
393 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
394 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
395 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
396 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
397 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
398 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
399 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
400 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
401 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
402
403 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
404 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
405 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
406 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
407 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
408 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
409 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
410 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
411 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
412 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
413 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
414 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
415 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
416 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
417 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
418 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
419};
420
421static const unsigned char *const page_uni2charset[256] = {
422 page00
423};
424
425static const unsigned char charset2lower[256] = {
426 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
427 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
428 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
429 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
430 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
431 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
432 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
433 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
434 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
435 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
436 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
437 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
438 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
439 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
440 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
441 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
442
443 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
444 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
445 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
446 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
447 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
448 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
449 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
450 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
451 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
452 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
453 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
454 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
455 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
456 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
457 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
458 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
459};
460
461static const unsigned char charset2upper[256] = {
462 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
463 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
464 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
465 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
466 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
467 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
468 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
469 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
470 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
471 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
472 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
473 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
474 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
475 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
476 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
477 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
478
479 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
480 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
481 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
482 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
483 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
484 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
485 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
486 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
487 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
488 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
489 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
490 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
491 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
492 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
493 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
494 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
495};
496
497
498static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
499{
500 const unsigned char *uni2charset;
501 unsigned char cl = uni & 0x00ff;
502 unsigned char ch = (uni & 0xff00) >> 8;
503
504 if (boundlen <= 0)
505 return -ENAMETOOLONG;
506
507 uni2charset = page_uni2charset[ch];
508 if (uni2charset && uni2charset[cl])
509 out[0] = uni2charset[cl];
510 else
511 return -EINVAL;
512 return 1;
513}
514
515static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
516{
517 *uni = charset2uni[*rawstring];
518 if (*uni == 0x0000)
519 return -EINVAL;
520 return 1;
521}
522
523static struct nls_table default_table = {
524 .charset = "default",
525 .uni2char = uni2char,
526 .char2uni = char2uni,
527 .charset2lower = charset2lower,
528 .charset2upper = charset2upper,
529};
530
531/* Returns a simple default translation table */
532struct nls_table *load_nls_default(void)
533{
534 struct nls_table *default_nls;
535
536 default_nls = load_nls(CONFIG_NLS_DEFAULT);
537 if (default_nls != NULL)
538 return default_nls;
539 else
540 return &default_table;
541}
542
543EXPORT_SYMBOL(unregister_nls);
544EXPORT_SYMBOL(unload_nls);
545EXPORT_SYMBOL(load_nls);
546EXPORT_SYMBOL(load_nls_default);
547
548MODULE_DESCRIPTION("Base file system native language support");
549MODULE_LICENSE("Dual BSD/GPL");
550