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
20 static struct nls_table default_table;
21 static struct nls_table *tables = &default_table;
22 static DEFINE_SPINLOCK(nls_lock);
23
24 /*
25 * Sample implementation from Unicode home page.
26 * http://www.stonehand.com/unicode/standard/fss-utf.html
27 */
28 struct utf8_table {
29 int cmask;
30 int cval;
31 int shift;
32 long lmask;
33 long lval;
34 };
35
36 static const struct utf8_table utf8_table[] =
37 {
38 {0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
39 {0xE0, 0xC0, 1*6, 0x7FF, 0x80, /* 2 byte sequence */},
40 {0xF0, 0xE0, 2*6, 0xFFFF, 0x800, /* 3 byte sequence */},
41 {0xF8, 0xF0, 3*6, 0x1FFFFF, 0x10000, /* 4 byte sequence */},
42 {0xFC, 0xF8, 4*6, 0x3FFFFFF, 0x200000, /* 5 byte sequence */},
43 {0xFE, 0xFC, 5*6, 0x7FFFFFFF, 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
utf8_to_utf32(const u8 * s,int inlen,unicode_t * pu)55 int 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 -EILSEQ;
71
72 *pu = (unicode_t) l;
73 return nc;
74 }
75 if (inlen <= nc)
76 return -EOVERFLOW;
77
78 s++;
79 c = (*s ^ 0x80) & 0xFF;
80 if (c & 0xC0)
81 return -EILSEQ;
82
83 l = (l << 6) | c;
84 }
85 return -EILSEQ;
86 }
87 EXPORT_SYMBOL(utf8_to_utf32);
88
utf32_to_utf8(unicode_t u,u8 * s,int maxout)89 int utf32_to_utf8(unicode_t u, u8 *s, int maxout)
90 {
91 unsigned long l;
92 int c, nc;
93 const struct utf8_table *t;
94
95 if (!s)
96 return 0;
97
98 l = u;
99 if (l > UNICODE_MAX || (l & SURROGATE_MASK) == SURROGATE_PAIR)
100 return -EILSEQ;
101
102 nc = 0;
103 for (t = utf8_table; t->cmask && maxout; t++, maxout--) {
104 nc++;
105 if (l <= t->lmask) {
106 c = t->shift;
107 *s = (u8) (t->cval | (l >> c));
108 while (c > 0) {
109 c -= 6;
110 s++;
111 *s = (u8) (0x80 | ((l >> c) & 0x3F));
112 }
113 return nc;
114 }
115 }
116 return -EOVERFLOW;
117 }
118 EXPORT_SYMBOL(utf32_to_utf8);
119
put_utf16(wchar_t * s,unsigned c,enum utf16_endian endian)120 static inline void put_utf16(wchar_t *s, unsigned c, enum utf16_endian endian)
121 {
122 switch (endian) {
123 default:
124 *s = (wchar_t) c;
125 break;
126 case UTF16_LITTLE_ENDIAN:
127 *s = __cpu_to_le16(c);
128 break;
129 case UTF16_BIG_ENDIAN:
130 *s = __cpu_to_be16(c);
131 break;
132 }
133 }
134
utf8s_to_utf16s(const u8 * s,int inlen,enum utf16_endian endian,wchar_t * pwcs,int maxout)135 int utf8s_to_utf16s(const u8 *s, int inlen, enum utf16_endian endian,
136 wchar_t *pwcs, int maxout)
137 {
138 u16 *op;
139 int size;
140 unicode_t u;
141
142 op = pwcs;
143 while (inlen > 0 && maxout > 0 && *s) {
144 if (*s & 0x80) {
145 size = utf8_to_utf32(s, inlen, &u);
146 if (size < 0)
147 return -EINVAL;
148 s += size;
149 inlen -= size;
150
151 if (u >= PLANE_SIZE) {
152 if (maxout < 2)
153 break;
154 u -= PLANE_SIZE;
155 put_utf16(op++, SURROGATE_PAIR |
156 ((u >> 10) & SURROGATE_BITS),
157 endian);
158 put_utf16(op++, SURROGATE_PAIR |
159 SURROGATE_LOW |
160 (u & SURROGATE_BITS),
161 endian);
162 maxout -= 2;
163 } else {
164 put_utf16(op++, u, endian);
165 maxout--;
166 }
167 } else {
168 put_utf16(op++, *s++, endian);
169 inlen--;
170 maxout--;
171 }
172 }
173 return op - pwcs;
174 }
175 EXPORT_SYMBOL(utf8s_to_utf16s);
176
get_utf16(unsigned c,enum utf16_endian endian)177 static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
178 {
179 switch (endian) {
180 default:
181 return c;
182 case UTF16_LITTLE_ENDIAN:
183 return __le16_to_cpu(c);
184 case UTF16_BIG_ENDIAN:
185 return __be16_to_cpu(c);
186 }
187 }
188
utf16s_to_utf8s(const wchar_t * pwcs,int inlen,enum utf16_endian endian,u8 * s,int maxout)189 int utf16s_to_utf8s(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
190 u8 *s, int maxout)
191 {
192 u8 *op;
193 int size;
194 unsigned long u, v;
195
196 op = s;
197 while (inlen > 0 && maxout > 0) {
198 u = get_utf16(*pwcs, endian);
199 if (!u)
200 break;
201 pwcs++;
202 inlen--;
203 if (u > 0x7f) {
204 if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
205 if (u & SURROGATE_LOW) {
206 /* Ignore character and move on */
207 continue;
208 }
209 if (inlen <= 0)
210 break;
211 v = get_utf16(*pwcs, endian);
212 if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
213 !(v & SURROGATE_LOW)) {
214 /* Ignore character and move on */
215 continue;
216 }
217 u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
218 + (v & SURROGATE_BITS);
219 pwcs++;
220 inlen--;
221 }
222 size = utf32_to_utf8(u, op, maxout);
223 if (size < 0) {
224 if (size == -EILSEQ) {
225 /* Ignore character and move on */
226 continue;
227 }
228 /*
229 * Stop filling the buffer with data once a character
230 * does not fit anymore.
231 */
232 break;
233 } else {
234 op += size;
235 maxout -= size;
236 }
237 } else {
238 *op++ = (u8) u;
239 maxout--;
240 }
241 }
242 return op - s;
243 }
244 EXPORT_SYMBOL(utf16s_to_utf8s);
245
__register_nls(struct nls_table * nls,struct module * owner)246 int __register_nls(struct nls_table *nls, struct module *owner)
247 {
248 struct nls_table ** tmp = &tables;
249
250 if (nls->next)
251 return -EBUSY;
252
253 nls->owner = owner;
254 spin_lock(&nls_lock);
255 while (*tmp) {
256 if (nls == *tmp) {
257 spin_unlock(&nls_lock);
258 return -EBUSY;
259 }
260 tmp = &(*tmp)->next;
261 }
262 nls->next = tables;
263 tables = nls;
264 spin_unlock(&nls_lock);
265 return 0;
266 }
267 EXPORT_SYMBOL(__register_nls);
268
unregister_nls(struct nls_table * nls)269 int unregister_nls(struct nls_table * nls)
270 {
271 struct nls_table ** tmp = &tables;
272
273 spin_lock(&nls_lock);
274 while (*tmp) {
275 if (nls == *tmp) {
276 *tmp = nls->next;
277 spin_unlock(&nls_lock);
278 return 0;
279 }
280 tmp = &(*tmp)->next;
281 }
282 spin_unlock(&nls_lock);
283 return -EINVAL;
284 }
285
find_nls(const char * charset)286 static struct nls_table *find_nls(const char *charset)
287 {
288 struct nls_table *nls;
289 spin_lock(&nls_lock);
290 for (nls = tables; nls; nls = nls->next) {
291 if (!strcmp(nls->charset, charset))
292 break;
293 if (nls->alias && !strcmp(nls->alias, charset))
294 break;
295 }
296 if (nls && !try_module_get(nls->owner))
297 nls = NULL;
298 spin_unlock(&nls_lock);
299 return nls;
300 }
301
load_nls(const char * charset)302 struct nls_table *load_nls(const char *charset)
303 {
304 return try_then_request_module(find_nls(charset), "nls_%s", charset);
305 }
306
unload_nls(struct nls_table * nls)307 void unload_nls(struct nls_table *nls)
308 {
309 if (nls)
310 module_put(nls->owner);
311 }
312
313 static const wchar_t charset2uni[256] = {
314 /* 0x00*/
315 0x0000, 0x0001, 0x0002, 0x0003,
316 0x0004, 0x0005, 0x0006, 0x0007,
317 0x0008, 0x0009, 0x000a, 0x000b,
318 0x000c, 0x000d, 0x000e, 0x000f,
319 /* 0x10*/
320 0x0010, 0x0011, 0x0012, 0x0013,
321 0x0014, 0x0015, 0x0016, 0x0017,
322 0x0018, 0x0019, 0x001a, 0x001b,
323 0x001c, 0x001d, 0x001e, 0x001f,
324 /* 0x20*/
325 0x0020, 0x0021, 0x0022, 0x0023,
326 0x0024, 0x0025, 0x0026, 0x0027,
327 0x0028, 0x0029, 0x002a, 0x002b,
328 0x002c, 0x002d, 0x002e, 0x002f,
329 /* 0x30*/
330 0x0030, 0x0031, 0x0032, 0x0033,
331 0x0034, 0x0035, 0x0036, 0x0037,
332 0x0038, 0x0039, 0x003a, 0x003b,
333 0x003c, 0x003d, 0x003e, 0x003f,
334 /* 0x40*/
335 0x0040, 0x0041, 0x0042, 0x0043,
336 0x0044, 0x0045, 0x0046, 0x0047,
337 0x0048, 0x0049, 0x004a, 0x004b,
338 0x004c, 0x004d, 0x004e, 0x004f,
339 /* 0x50*/
340 0x0050, 0x0051, 0x0052, 0x0053,
341 0x0054, 0x0055, 0x0056, 0x0057,
342 0x0058, 0x0059, 0x005a, 0x005b,
343 0x005c, 0x005d, 0x005e, 0x005f,
344 /* 0x60*/
345 0x0060, 0x0061, 0x0062, 0x0063,
346 0x0064, 0x0065, 0x0066, 0x0067,
347 0x0068, 0x0069, 0x006a, 0x006b,
348 0x006c, 0x006d, 0x006e, 0x006f,
349 /* 0x70*/
350 0x0070, 0x0071, 0x0072, 0x0073,
351 0x0074, 0x0075, 0x0076, 0x0077,
352 0x0078, 0x0079, 0x007a, 0x007b,
353 0x007c, 0x007d, 0x007e, 0x007f,
354 /* 0x80*/
355 0x0080, 0x0081, 0x0082, 0x0083,
356 0x0084, 0x0085, 0x0086, 0x0087,
357 0x0088, 0x0089, 0x008a, 0x008b,
358 0x008c, 0x008d, 0x008e, 0x008f,
359 /* 0x90*/
360 0x0090, 0x0091, 0x0092, 0x0093,
361 0x0094, 0x0095, 0x0096, 0x0097,
362 0x0098, 0x0099, 0x009a, 0x009b,
363 0x009c, 0x009d, 0x009e, 0x009f,
364 /* 0xa0*/
365 0x00a0, 0x00a1, 0x00a2, 0x00a3,
366 0x00a4, 0x00a5, 0x00a6, 0x00a7,
367 0x00a8, 0x00a9, 0x00aa, 0x00ab,
368 0x00ac, 0x00ad, 0x00ae, 0x00af,
369 /* 0xb0*/
370 0x00b0, 0x00b1, 0x00b2, 0x00b3,
371 0x00b4, 0x00b5, 0x00b6, 0x00b7,
372 0x00b8, 0x00b9, 0x00ba, 0x00bb,
373 0x00bc, 0x00bd, 0x00be, 0x00bf,
374 /* 0xc0*/
375 0x00c0, 0x00c1, 0x00c2, 0x00c3,
376 0x00c4, 0x00c5, 0x00c6, 0x00c7,
377 0x00c8, 0x00c9, 0x00ca, 0x00cb,
378 0x00cc, 0x00cd, 0x00ce, 0x00cf,
379 /* 0xd0*/
380 0x00d0, 0x00d1, 0x00d2, 0x00d3,
381 0x00d4, 0x00d5, 0x00d6, 0x00d7,
382 0x00d8, 0x00d9, 0x00da, 0x00db,
383 0x00dc, 0x00dd, 0x00de, 0x00df,
384 /* 0xe0*/
385 0x00e0, 0x00e1, 0x00e2, 0x00e3,
386 0x00e4, 0x00e5, 0x00e6, 0x00e7,
387 0x00e8, 0x00e9, 0x00ea, 0x00eb,
388 0x00ec, 0x00ed, 0x00ee, 0x00ef,
389 /* 0xf0*/
390 0x00f0, 0x00f1, 0x00f2, 0x00f3,
391 0x00f4, 0x00f5, 0x00f6, 0x00f7,
392 0x00f8, 0x00f9, 0x00fa, 0x00fb,
393 0x00fc, 0x00fd, 0x00fe, 0x00ff,
394 };
395
396 static const unsigned char page00[256] = {
397 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
398 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
399 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
400 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
401 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
402 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
403 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
404 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
405 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
406 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
407 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
408 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
409 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
410 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
411 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
412 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
413
414 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
415 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
416 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
417 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
418 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
419 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
420 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
421 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
422 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
423 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
424 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
425 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
426 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
427 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
428 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
429 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
430 };
431
432 static const unsigned char *const page_uni2charset[256] = {
433 page00
434 };
435
436 static const unsigned char charset2lower[256] = {
437 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
438 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
439 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
440 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
441 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
442 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
443 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
444 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
445 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
446 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
447 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
448 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
449 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
450 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
451 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
452 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
453
454 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
455 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
456 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
457 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
458 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
459 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
460 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
461 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
462 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
463 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
464 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
465 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
466 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
467 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
468 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
469 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
470 };
471
472 static const unsigned char charset2upper[256] = {
473 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
474 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
475 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
476 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
477 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
478 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
479 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
480 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
481 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
482 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
483 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
484 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
485 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
486 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
487 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
488 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
489
490 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
491 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
492 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
493 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
494 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
495 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
496 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
497 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
498 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
499 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
500 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
501 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
502 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
503 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
504 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
505 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
506 };
507
508
uni2char(wchar_t uni,unsigned char * out,int boundlen)509 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
510 {
511 const unsigned char *uni2charset;
512 unsigned char cl = uni & 0x00ff;
513 unsigned char ch = (uni & 0xff00) >> 8;
514
515 if (boundlen <= 0)
516 return -ENAMETOOLONG;
517
518 uni2charset = page_uni2charset[ch];
519 if (uni2charset && uni2charset[cl])
520 out[0] = uni2charset[cl];
521 else
522 return -EINVAL;
523 return 1;
524 }
525
char2uni(const unsigned char * rawstring,int boundlen,wchar_t * uni)526 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
527 {
528 *uni = charset2uni[*rawstring];
529 if (*uni == 0x0000)
530 return -EINVAL;
531 return 1;
532 }
533
534 static struct nls_table default_table = {
535 .charset = "default",
536 .uni2char = uni2char,
537 .char2uni = char2uni,
538 .charset2lower = charset2lower,
539 .charset2upper = charset2upper,
540 };
541
542 /* Returns a simple default translation table */
load_nls_default(void)543 struct nls_table *load_nls_default(void)
544 {
545 struct nls_table *default_nls;
546
547 default_nls = load_nls(CONFIG_NLS_DEFAULT);
548 if (default_nls != NULL)
549 return default_nls;
550 else
551 return &default_table;
552 }
553
554 EXPORT_SYMBOL(unregister_nls);
555 EXPORT_SYMBOL(unload_nls);
556 EXPORT_SYMBOL(load_nls);
557 EXPORT_SYMBOL(load_nls_default);
558
559 MODULE_DESCRIPTION("Base file system native language support");
560 MODULE_LICENSE("Dual BSD/GPL");
561