xref: /openbmc/linux/fs/nls/nls_base.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /*
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 
22 static struct nls_table default_table;
23 static struct nls_table *tables = &default_table;
24 static DEFINE_SPINLOCK(nls_lock);
25 
26 /*
27  * Sample implementation from Unicode home page.
28  * http://www.stonehand.com/unicode/standard/fss-utf.html
29  */
30 struct utf8_table {
31 	int     cmask;
32 	int     cval;
33 	int     shift;
34 	long    lmask;
35 	long    lval;
36 };
37 
38 static 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 
49 int
50 utf8_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 
79 int
80 utf8_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 
108 int
109 utf8_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 
136 int
137 utf8_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 
163 int 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 
186 int 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 
203 static 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 
219 struct 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 
241 void unload_nls(struct nls_table *nls)
242 {
243 	module_put(nls->owner);
244 }
245 
246 static wchar_t charset2uni[256] = {
247 	/* 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 
329 static 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 
365 static unsigned char *page_uni2charset[256] = {
366 	page00
367 };
368 
369 static 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 
405 static 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 
442 static 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 
459 static 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 
467 static 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 */
476 struct 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 
487 EXPORT_SYMBOL(register_nls);
488 EXPORT_SYMBOL(unregister_nls);
489 EXPORT_SYMBOL(unload_nls);
490 EXPORT_SYMBOL(load_nls);
491 EXPORT_SYMBOL(load_nls_default);
492 EXPORT_SYMBOL(utf8_mbtowc);
493 EXPORT_SYMBOL(utf8_mbstowcs);
494 EXPORT_SYMBOL(utf8_wctomb);
495 EXPORT_SYMBOL(utf8_wcstombs);
496 
497 MODULE_LICENSE("Dual BSD/GPL");
498