summaryrefslogtreecommitdiffstats
path: root/fs/nls/nls_base.c
blob: 477d37d83b316367e1ac04fb31ba98e375a37b1a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
/*
 * linux/fs/nls/nls_base.c
 *
 * Native language support--charsets and unicode translations.
 * By Gordon Chaffee 1996, 1997
 *
 * Unicode based case conversion 1999 by Wolfram Pienkoss
 *
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/nls.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/kmod.h>
#include <linux/spinlock.h>
#include <asm/byteorder.h>

static struct nls_table default_table;
static struct nls_table *tables = &default_table;
static DEFINE_SPINLOCK(nls_lock);

/*
 * Sample implementation from Unicode home page.
 * http://www.stonehand.com/unicode/standard/fss-utf.html
 */
struct utf8_table {
	int     cmask;
	int     cval;
	int     shift;
	long    lmask;
	long    lval;
};

static const struct utf8_table utf8_table[] =
{
    {0x80,  0x00,   0*6,    0x7F,           0,         /* 1 byte sequence */},
    {0xE0,  0xC0,   1*6,    0x7FF,          0x80,      /* 2 byte sequence */},
    {0xF0,  0xE0,   2*6,    0xFFFF,         0x800,     /* 3 byte sequence */},
    {0xF8,  0xF0,   3*6,    0x1FFFFF,       0x10000,   /* 4 byte sequence */},
    {0xFC,  0xF8,   4*6,    0x3FFFFFF,      0x200000,  /* 5 byte sequence */},
    {0xFE,  0xFC,   5*6,    0x7FFFFFFF,     0x4000000, /* 6 byte sequence */},
    {0,						       /* end of table    */}
};

#define UNICODE_MAX	0x0010ffff
#define PLANE_SIZE	0x00010000

#define SURROGATE_MASK	0xfffff800
#define SURROGATE_PAIR	0x0000d800
#define SURROGATE_LOW	0x00000400
#define SURROGATE_BITS	0x000003ff

int utf8_to_utf32(const u8 *s, int len, unicode_t *pu)
{
	unsigned long l;
	int c0, c, nc;
	const struct utf8_table *t;
  
	nc = 0;
	c0 = *s;
	l = c0;
	for (t = utf8_table; t->cmask; t++) {
		nc++;
		if ((c0 & t->cmask) == t->cval) {
			l &= t->lmask;
			if (l < t->lval || l > UNICODE_MAX ||
					(l & SURROGATE_MASK) == SURROGATE_PAIR)
				return -1;
			*pu = (unicode_t) l;
			return nc;
		}
		if (len <= nc)
			return -1;
		s++;
		c = (*s ^ 0x80) & 0xFF;
		if (c & 0xC0)
			return -1;
		l = (l << 6) | c;
	}
	return -1;
}
EXPORT_SYMBOL(utf8_to_utf32);

int utf32_to_utf8(unicode_t u, u8 *s, int maxlen)
{
	unsigned long l;
	int c, nc;
	const struct utf8_table *t;

	if (!s)
		return 0;

	l = u;
	if (l > UNICODE_MAX || (l & SURROGATE_MASK) == SURROGATE_PAIR)
		return -1;

	nc = 0;
	for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
		nc++;
		if (l <= t->lmask) {
			c = t->shift;
			*s = (u8) (t->cval | (l >> c));
			while (c > 0) {
				c -= 6;
				s++;
				*s = (u8) (0x80 | ((l >> c) & 0x3F));
			}
			return nc;
		}
	}
	return -1;
}
EXPORT_SYMBOL(utf32_to_utf8);

int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs)
{
	u16 *op;
	int size;
	unicode_t u;

	op = pwcs;
	while (*s && len > 0) {
		if (*s & 0x80) {
			size = utf8_to_utf32(s, len, &u);
			if (size < 0) {
				/* Ignore character and move on */
				size = 1;
			} else if (u >= PLANE_SIZE) {
				u -= PLANE_SIZE;
				*op++ = (wchar_t) (SURROGATE_PAIR |
						((u >> 10) & SURROGATE_BITS));
				*op++ = (wchar_t) (SURROGATE_PAIR |
						SURROGATE_LOW |
						(u & SURROGATE_BITS));
			} else {
				*op++ = (wchar_t) u;
			}
			s += size;
			len -= size;
		} else {
			*op++ = *s++;
			len--;
		}
	}
	return op - pwcs;
}
EXPORT_SYMBOL(utf8s_to_utf16s);

static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
{
	switch (endian) {
	default:
		return c;
	case UTF16_LITTLE_ENDIAN:
		return __le16_to_cpu(c);
	case UTF16_BIG_ENDIAN:
		return __be16_to_cpu(c);
	}
}

int utf16s_to_utf8s(const wchar_t *pwcs, int len, enum utf16_endian endian,
		u8 *s, int maxlen)
{
	u8 *op;
	int size;
	unsigned long u, v;

	op = s;
	while (len > 0 && maxlen > 0) {
		u = get_utf16(*pwcs, endian);
		if (!u)
			break;
		pwcs++;
		len--;
		if (u > 0x7f) {
			if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
				if (u & SURROGATE_LOW) {
					/* Ignore character and move on */
					continue;
				}
				if (len <= 0)
					break;
				v = get_utf16(*pwcs, endian);
				if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
						!(v & SURROGATE_LOW)) {
					/* Ignore character and move on */
					continue;
				}
				u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
						+ (v & SURROGATE_BITS);
				pwcs++;
				len--;
			}
			size = utf32_to_utf8(u, op, maxlen);
			if (size == -1) {
				/* Ignore character and move on */
			} else {
				op += size;
				maxlen -= size;
			}
		} else {
			*op++ = (u8) u;
			maxlen--;
		}
	}
	return op - s;
}
EXPORT_SYMBOL(utf16s_to_utf8s);

int register_nls(struct nls_table * nls)
{
	struct nls_table ** tmp = &tables;

	if (nls->next)
		return -EBUSY;

	spin_lock(&nls_lock);
	while (*tmp) {
		if (nls == *tmp) {
			spin_unlock(&nls_lock);
			return -EBUSY;
		}
		tmp = &(*tmp)->next;
	}
	nls->next = tables;
	tables = nls;
	spin_unlock(&nls_lock);
	return 0;	
}

int unregister_nls(struct nls_table * nls)
{
	struct nls_table ** tmp = &tables;

	spin_lock(&nls_lock);
	while (*tmp) {
		if (nls == *tmp) {
			*tmp = nls->next;
			spin_unlock(&nls_lock);
			return 0;
		}
		tmp = &(*tmp)->next;
	}
	spin_unlock(&nls_lock);
	return -EINVAL;
}

static struct nls_table *find_nls(char *charset)
{
	struct nls_table *nls;
	spin_lock(&nls_lock);
	for (nls = tables; nls; nls = nls->next) {
		if (!strcmp(nls->charset, charset))
			break;
		if (nls->alias && !strcmp(nls->alias, charset))
			break;
	}
	if (nls && !try_module_get(nls->owner))
		nls = NULL;
	spin_unlock(&nls_lock);
	return nls;
}

struct nls_table *load_nls(char *charset)
{
	return try_then_request_module(find_nls(charset), "nls_%s", charset);
}

void unload_nls(struct nls_table *nls)
{
	module_put(nls->owner);
}

static const wchar_t charset2uni[256] = {
	/* 0x00*/
	0x0000, 0x0001, 0x0002, 0x0003,
	0x0004, 0x0005, 0x0006, 0x0007,
	0x0008, 0x0009, 0x000a, 0x000b,
	0x000c, 0x000d, 0x000e, 0x000f,
	/* 0x10*/
	0x0010, 0x0011, 0x0012, 0x0013,
	0x0014, 0x0015, 0x0016, 0x0017,
	0x0018, 0x0019, 0x001a, 0x001b,
	0x001c, 0x001d, 0x001e, 0x001f,
	/* 0x20*/
	0x0020, 0x0021, 0x0022, 0x0023,
	0x0024, 0x0025, 0x0026, 0x0027,
	0x0028, 0x0029, 0x002a, 0x002b,
	0x002c, 0x002d, 0x002e, 0x002f,
	/* 0x30*/
	0x0030, 0x0031, 0x0032, 0x0033,
	0x0034, 0x0035, 0x0036, 0x0037,
	0x0038, 0x0039, 0x003a, 0x003b,
	0x003c, 0x003d, 0x003e, 0x003f,
	/* 0x40*/
	0x0040, 0x0041, 0x0042, 0x0043,
	0x0044, 0x0045, 0x0046, 0x0047,
	0x0048, 0x0049, 0x004a, 0x004b,
	0x004c, 0x004d, 0x004e, 0x004f,
	/* 0x50*/
	0x0050, 0x0051, 0x0052, 0x0053,
	0x0054, 0x0055, 0x0056, 0x0057,
	0x0058, 0x0059, 0x005a, 0x005b,
	0x005c, 0x005d, 0x005e, 0x005f,
	/* 0x60*/
	0x0060, 0x0061, 0x0062, 0x0063,
	0x0064, 0x0065, 0x0066, 0x0067,
	0x0068, 0x0069, 0x006a, 0x006b,
	0x006c, 0x006d, 0x006e, 0x006f,
	/* 0x70*/
	0x0070, 0x0071, 0x0072, 0x0073,
	0x0074, 0x0075, 0x0076, 0x0077,
	0x0078, 0x0079, 0x007a, 0x007b,
	0x007c, 0x007d, 0x007e, 0x007f,
	/* 0x80*/
	0x0080, 0x0081, 0x0082, 0x0083,
	0x0084, 0x0085, 0x0086, 0x0087,
	0x0088, 0x0089, 0x008a, 0x008b,
	0x008c, 0x008d, 0x008e, 0x008f,
	/* 0x90*/
	0x0090, 0x0091, 0x0092, 0x0093,
	0x0094, 0x0095, 0x0096, 0x0097,
	0x0098, 0x0099, 0x009a, 0x009b,
	0x009c, 0x009d, 0x009e, 0x009f,
	/* 0xa0*/
	0x00a0, 0x00a1, 0x00a2, 0x00a3,
	0x00a4, 0x00a5, 0x00a6, 0x00a7,
	0x00a8, 0x00a9, 0x00aa, 0x00ab,
	0x00ac, 0x00ad, 0x00ae, 0x00af,
	/* 0xb0*/
	0x00b0, 0x00b1, 0x00b2, 0x00b3,
	0x00b4, 0x00b5, 0x00b6, 0x00b7,
	0x00b8, 0x00b9, 0x00ba, 0x00bb,
	0x00bc, 0x00bd, 0x00be, 0x00bf,
	/* 0xc0*/
	0x00c0, 0x00c1, 0x00c2, 0x00c3,
	0x00c4, 0x00c5, 0x00c6, 0x00c7,
	0x00c8, 0x00c9, 0x00ca, 0x00cb,
	0x00cc, 0x00cd, 0x00ce, 0x00cf,
	/* 0xd0*/
	0x00d0, 0x00d1, 0x00d2, 0x00d3,
	0x00d4, 0x00d5, 0x00d6, 0x00d7,
	0x00d8, 0x00d9, 0x00da, 0x00db,
	0x00dc, 0x00dd, 0x00de, 0x00df,
	/* 0xe0*/
	0x00e0, 0x00e1, 0x00e2, 0x00e3,
	0x00e4, 0x00e5, 0x00e6, 0x00e7,
	0x00e8, 0x00e9, 0x00ea, 0x00eb,
	0x00ec, 0x00ed, 0x00ee, 0x00ef,
	/* 0xf0*/
	0x00f0, 0x00f1, 0x00f2, 0x00f3,
	0x00f4, 0x00f5, 0x00f6, 0x00f7,
	0x00f8, 0x00f9, 0x00fa, 0x00fb,
	0x00fc, 0x00fd, 0x00fe, 0x00ff,
};

static const unsigned char page00[256] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */

	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};

static const unsigned char *const page_uni2charset[256] = {
	page00
};

static const unsigned char charset2lower[256] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
	0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
	0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */

	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};

static const unsigned char charset2upper[256] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
	0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
	0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */

	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};


static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
{
	const unsigned char *uni2charset;
	unsigned char cl = uni & 0x00ff;
	unsigned char ch = (uni & 0xff00) >> 8;

	if (boundlen <= 0)
		return -ENAMETOOLONG;

	uni2charset = page_uni2charset[ch];
	if (uni2charset && uni2charset[cl])
		out[0] = uni2charset[cl];
	else
		return -EINVAL;
	return 1;
}

static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
{
	*uni = charset2uni[*rawstring];
	if (*uni == 0x0000)
		return -EINVAL;
	return 1;
}

static struct nls_table default_table = {
	.charset	= "default",
	.uni2char	= uni2char,
	.char2uni	= char2uni,
	.charset2lower	= charset2lower,
	.charset2upper	= charset2upper,
};

/* Returns a simple default translation table */
struct nls_table *load_nls_default(void)
{
	struct nls_table *default_nls;
	
	default_nls = load_nls(CONFIG_NLS_DEFAULT);
	if (default_nls != NULL)
		return default_nls;
	else
		return &default_table;
}

EXPORT_SYMBOL(register_nls);
EXPORT_SYMBOL(unregister_nls);
EXPORT_SYMBOL(unload_nls);
EXPORT_SYMBOL(load_nls);
EXPORT_SYMBOL(load_nls_default);

MODULE_LICENSE("Dual BSD/GPL");