blob: a912debcd20b3c27850c4e5754e164888a0a9e9d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/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/config.h>
14#include <linux/nls.h>
15#include <linux/kernel.h>
16#include <linux/errno.h>
17#ifdef CONFIG_KMOD
18#include <linux/kmod.h>
19#endif
20#include <linux/spinlock.h>
21
22static struct nls_table default_table;
23static struct nls_table *tables = &default_table;
24static DEFINE_SPINLOCK(nls_lock);
25
26/*
27 * Sample implementation from Unicode home page.
28 * http://www.stonehand.com/unicode/standard/fss-utf.html
29 */
30struct utf8_table {
31 int cmask;
32 int cval;
33 int shift;
34 long lmask;
35 long lval;
36};
37
38static struct utf8_table utf8_table[] =
39{
40 {0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
41 {0xE0, 0xC0, 1*6, 0x7FF, 0x80, /* 2 byte sequence */},
42 {0xF0, 0xE0, 2*6, 0xFFFF, 0x800, /* 3 byte sequence */},
43 {0xF8, 0xF0, 3*6, 0x1FFFFF, 0x10000, /* 4 byte sequence */},
44 {0xFC, 0xF8, 4*6, 0x3FFFFFF, 0x200000, /* 5 byte sequence */},
45 {0xFE, 0xFC, 5*6, 0x7FFFFFFF, 0x4000000, /* 6 byte sequence */},
46 {0, /* end of table */}
47};
48
49int
50utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
51{
52 long l;
53 int c0, c, nc;
54 struct utf8_table *t;
55
56 nc = 0;
57 c0 = *s;
58 l = c0;
59 for (t = utf8_table; t->cmask; t++) {
60 nc++;
61 if ((c0 & t->cmask) == t->cval) {
62 l &= t->lmask;
63 if (l < t->lval)
64 return -1;
65 *p = l;
66 return nc;
67 }
68 if (n <= nc)
69 return -1;
70 s++;
71 c = (*s ^ 0x80) & 0xFF;
72 if (c & 0xC0)
73 return -1;
74 l = (l << 6) | c;
75 }
76 return -1;
77}
78
79int
80utf8_mbstowcs(wchar_t *pwcs, const __u8 *s, int n)
81{
82 __u16 *op;
83 const __u8 *ip;
84 int size;
85
86 op = pwcs;
87 ip = s;
88 while (*ip && n > 0) {
89 if (*ip & 0x80) {
90 size = utf8_mbtowc(op, ip, n);
91 if (size == -1) {
92 /* Ignore character and move on */
93 ip++;
94 n--;
95 } else {
96 op++;
97 ip += size;
98 n -= size;
99 }
100 } else {
101 *op++ = *ip++;
102 n--;
103 }
104 }
105 return (op - pwcs);
106}
107
108int
109utf8_wctomb(__u8 *s, wchar_t wc, int maxlen)
110{
111 long l;
112 int c, nc;
113 struct utf8_table *t;
114
115 if (s == 0)
116 return 0;
117
118 l = wc;
119 nc = 0;
120 for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
121 nc++;
122 if (l <= t->lmask) {
123 c = t->shift;
124 *s = t->cval | (l >> c);
125 while (c > 0) {
126 c -= 6;
127 s++;
128 *s = 0x80 | ((l >> c) & 0x3F);
129 }
130 return nc;
131 }
132 }
133 return -1;
134}
135
136int
137utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
138{
139 const __u16 *ip;
140 __u8 *op;
141 int size;
142
143 op = s;
144 ip = pwcs;
145 while (*ip && maxlen > 0) {
146 if (*ip > 0x7f) {
147 size = utf8_wctomb(op, *ip, maxlen);
148 if (size == -1) {
149 /* Ignore character and move on */
150 maxlen--;
151 } else {
152 op += size;
153 maxlen -= size;
154 }
155 } else {
156 *op++ = (__u8) *ip;
157 }
158 ip++;
159 }
160 return (op - s);
161}
162
163int register_nls(struct nls_table * nls)
164{
165 struct nls_table ** tmp = &tables;
166
167 if (!nls)
168 return -EINVAL;
169 if (nls->next)
170 return -EBUSY;
171
172 spin_lock(&nls_lock);
173 while (*tmp) {
174 if (nls == *tmp) {
175 spin_unlock(&nls_lock);
176 return -EBUSY;
177 }
178 tmp = &(*tmp)->next;
179 }
180 nls->next = tables;
181 tables = nls;
182 spin_unlock(&nls_lock);
183 return 0;
184}
185
186int unregister_nls(struct nls_table * nls)
187{
188 struct nls_table ** tmp = &tables;
189
190 spin_lock(&nls_lock);
191 while (*tmp) {
192 if (nls == *tmp) {
193 *tmp = nls->next;
194 spin_unlock(&nls_lock);
195 return 0;
196 }
197 tmp = &(*tmp)->next;
198 }
199 spin_unlock(&nls_lock);
200 return -EINVAL;
201}
202
203static struct nls_table *find_nls(char *charset)
204{
205 struct nls_table *nls;
206 spin_lock(&nls_lock);
207 for (nls = tables; nls; nls = nls->next) {
208 if (!strcmp(nls->charset, charset))
209 break;
210 if (nls->alias && !strcmp(nls->alias, charset))
211 break;
212 }
213 if (nls && !try_module_get(nls->owner))
214 nls = NULL;
215 spin_unlock(&nls_lock);
216 return nls;
217}
218
219struct nls_table *load_nls(char *charset)
220{
221 struct nls_table *nls;
222#ifdef CONFIG_KMOD
223 int ret;
224#endif
225
226 nls = find_nls(charset);
227 if (nls)
228 return nls;
229
230#ifdef CONFIG_KMOD
231 ret = request_module("nls_%s", charset);
232 if (ret != 0) {
233 printk("Unable to load NLS charset %s\n", charset);
234 return NULL;
235 }
236 nls = find_nls(charset);
237#endif
238 return nls;
239}
240
241void unload_nls(struct nls_table *nls)
242{
243 module_put(nls->owner);
244}
245
Adrian Bunk75c96f82005-05-05 16:16:09 -0700246static wchar_t charset2uni[256] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 /* 0x00*/
248 0x0000, 0x0001, 0x0002, 0x0003,
249 0x0004, 0x0005, 0x0006, 0x0007,
250 0x0008, 0x0009, 0x000a, 0x000b,
251 0x000c, 0x000d, 0x000e, 0x000f,
252 /* 0x10*/
253 0x0010, 0x0011, 0x0012, 0x0013,
254 0x0014, 0x0015, 0x0016, 0x0017,
255 0x0018, 0x0019, 0x001a, 0x001b,
256 0x001c, 0x001d, 0x001e, 0x001f,
257 /* 0x20*/
258 0x0020, 0x0021, 0x0022, 0x0023,
259 0x0024, 0x0025, 0x0026, 0x0027,
260 0x0028, 0x0029, 0x002a, 0x002b,
261 0x002c, 0x002d, 0x002e, 0x002f,
262 /* 0x30*/
263 0x0030, 0x0031, 0x0032, 0x0033,
264 0x0034, 0x0035, 0x0036, 0x0037,
265 0x0038, 0x0039, 0x003a, 0x003b,
266 0x003c, 0x003d, 0x003e, 0x003f,
267 /* 0x40*/
268 0x0040, 0x0041, 0x0042, 0x0043,
269 0x0044, 0x0045, 0x0046, 0x0047,
270 0x0048, 0x0049, 0x004a, 0x004b,
271 0x004c, 0x004d, 0x004e, 0x004f,
272 /* 0x50*/
273 0x0050, 0x0051, 0x0052, 0x0053,
274 0x0054, 0x0055, 0x0056, 0x0057,
275 0x0058, 0x0059, 0x005a, 0x005b,
276 0x005c, 0x005d, 0x005e, 0x005f,
277 /* 0x60*/
278 0x0060, 0x0061, 0x0062, 0x0063,
279 0x0064, 0x0065, 0x0066, 0x0067,
280 0x0068, 0x0069, 0x006a, 0x006b,
281 0x006c, 0x006d, 0x006e, 0x006f,
282 /* 0x70*/
283 0x0070, 0x0071, 0x0072, 0x0073,
284 0x0074, 0x0075, 0x0076, 0x0077,
285 0x0078, 0x0079, 0x007a, 0x007b,
286 0x007c, 0x007d, 0x007e, 0x007f,
287 /* 0x80*/
288 0x0080, 0x0081, 0x0082, 0x0083,
289 0x0084, 0x0085, 0x0086, 0x0087,
290 0x0088, 0x0089, 0x008a, 0x008b,
291 0x008c, 0x008d, 0x008e, 0x008f,
292 /* 0x90*/
293 0x0090, 0x0091, 0x0092, 0x0093,
294 0x0094, 0x0095, 0x0096, 0x0097,
295 0x0098, 0x0099, 0x009a, 0x009b,
296 0x009c, 0x009d, 0x009e, 0x009f,
297 /* 0xa0*/
298 0x00a0, 0x00a1, 0x00a2, 0x00a3,
299 0x00a4, 0x00a5, 0x00a6, 0x00a7,
300 0x00a8, 0x00a9, 0x00aa, 0x00ab,
301 0x00ac, 0x00ad, 0x00ae, 0x00af,
302 /* 0xb0*/
303 0x00b0, 0x00b1, 0x00b2, 0x00b3,
304 0x00b4, 0x00b5, 0x00b6, 0x00b7,
305 0x00b8, 0x00b9, 0x00ba, 0x00bb,
306 0x00bc, 0x00bd, 0x00be, 0x00bf,
307 /* 0xc0*/
308 0x00c0, 0x00c1, 0x00c2, 0x00c3,
309 0x00c4, 0x00c5, 0x00c6, 0x00c7,
310 0x00c8, 0x00c9, 0x00ca, 0x00cb,
311 0x00cc, 0x00cd, 0x00ce, 0x00cf,
312 /* 0xd0*/
313 0x00d0, 0x00d1, 0x00d2, 0x00d3,
314 0x00d4, 0x00d5, 0x00d6, 0x00d7,
315 0x00d8, 0x00d9, 0x00da, 0x00db,
316 0x00dc, 0x00dd, 0x00de, 0x00df,
317 /* 0xe0*/
318 0x00e0, 0x00e1, 0x00e2, 0x00e3,
319 0x00e4, 0x00e5, 0x00e6, 0x00e7,
320 0x00e8, 0x00e9, 0x00ea, 0x00eb,
321 0x00ec, 0x00ed, 0x00ee, 0x00ef,
322 /* 0xf0*/
323 0x00f0, 0x00f1, 0x00f2, 0x00f3,
324 0x00f4, 0x00f5, 0x00f6, 0x00f7,
325 0x00f8, 0x00f9, 0x00fa, 0x00fb,
326 0x00fc, 0x00fd, 0x00fe, 0x00ff,
327};
328
329static unsigned char page00[256] = {
330 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
331 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
332 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
333 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
334 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
335 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
336 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
337 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
338 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
339 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
340 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
341 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
342 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
343 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
344 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
345 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
346
347 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
348 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
349 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
350 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
351 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
352 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
353 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
354 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
355 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
356 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
357 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
358 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
359 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
360 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
361 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
362 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
363};
364
365static unsigned char *page_uni2charset[256] = {
366 page00
367};
368
369static unsigned char charset2lower[256] = {
370 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
371 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
372 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
373 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
374 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
375 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
376 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
377 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
378 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
379 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
380 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
381 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
382 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
383 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
384 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
385 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
386
387 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
388 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
389 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
390 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
391 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
392 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
393 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
394 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
395 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
396 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
397 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
398 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
399 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
400 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
401 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
402 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
403};
404
405static unsigned char charset2upper[256] = {
406 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
407 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
408 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
409 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
410 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
411 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
412 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
413 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
414 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
415 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
416 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
417 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
418 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
419 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
420 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
421 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
422
423 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
424 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
425 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
426 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
427 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
428 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
429 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
430 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
431 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
432 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
433 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
434 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
435 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
436 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
437 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
438 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
439};
440
441
442static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
443{
444 unsigned char *uni2charset;
445 unsigned char cl = uni & 0x00ff;
446 unsigned char ch = (uni & 0xff00) >> 8;
447
448 if (boundlen <= 0)
449 return -ENAMETOOLONG;
450
451 uni2charset = page_uni2charset[ch];
452 if (uni2charset && uni2charset[cl])
453 out[0] = uni2charset[cl];
454 else
455 return -EINVAL;
456 return 1;
457}
458
459static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
460{
461 *uni = charset2uni[*rawstring];
462 if (*uni == 0x0000)
463 return -EINVAL;
464 return 1;
465}
466
467static struct nls_table default_table = {
468 .charset = "default",
469 .uni2char = uni2char,
470 .char2uni = char2uni,
471 .charset2lower = charset2lower,
472 .charset2upper = charset2upper,
473};
474
475/* Returns a simple default translation table */
476struct nls_table *load_nls_default(void)
477{
478 struct nls_table *default_nls;
479
480 default_nls = load_nls(CONFIG_NLS_DEFAULT);
481 if (default_nls != NULL)
482 return default_nls;
483 else
484 return &default_table;
485}
486
487EXPORT_SYMBOL(register_nls);
488EXPORT_SYMBOL(unregister_nls);
489EXPORT_SYMBOL(unload_nls);
490EXPORT_SYMBOL(load_nls);
491EXPORT_SYMBOL(load_nls_default);
492EXPORT_SYMBOL(utf8_mbtowc);
493EXPORT_SYMBOL(utf8_mbstowcs);
494EXPORT_SYMBOL(utf8_wctomb);
495EXPORT_SYMBOL(utf8_wcstombs);
496
497MODULE_LICENSE("Dual BSD/GPL");