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 | |
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 -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 | } |
84 | EXPORT_SYMBOL(utf8_to_utf32); |
85 | |
86 | int 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 | } |
115 | EXPORT_SYMBOL(utf32_to_utf8); |
116 | |
117 | static 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 | |
132 | int 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 | } |
172 | EXPORT_SYMBOL(utf8s_to_utf16s); |
173 | |
174 | static 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 | |
186 | int 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 | } |
233 | EXPORT_SYMBOL(utf16s_to_utf8s); |
234 | |
235 | int __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 | } |
256 | EXPORT_SYMBOL(__register_nls); |
257 | |
258 | int 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 | |
275 | static 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 | |
291 | struct nls_table *load_nls(const char *charset) |
292 | { |
293 | return try_then_request_module(find_nls(charset), "nls_%s" , charset); |
294 | } |
295 | |
296 | void unload_nls(struct nls_table *nls) |
297 | { |
298 | if (nls) |
299 | module_put(module: nls->owner); |
300 | } |
301 | |
302 | static 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 | |
385 | static 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 | |
421 | static const unsigned char *const page_uni2charset[256] = { |
422 | page00 |
423 | }; |
424 | |
425 | static 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 | |
461 | static 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 | |
498 | static 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 | |
515 | static 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 | |
523 | static 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 */ |
532 | struct 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 | |
543 | EXPORT_SYMBOL(unregister_nls); |
544 | EXPORT_SYMBOL(unload_nls); |
545 | EXPORT_SYMBOL(load_nls); |
546 | EXPORT_SYMBOL(load_nls_default); |
547 | |
548 | MODULE_LICENSE("Dual BSD/GPL" ); |
549 | |