Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6
[linux-2.6.git] / fs / nls / nls_base.c
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 len, 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 (len <= 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 maxlen)
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 && maxlen; t++, maxlen--) {
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 int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs)
118 {
119         u16 *op;
120         int size;
121         unicode_t u;
122
123         op = pwcs;
124         while (*s && len > 0) {
125                 if (*s & 0x80) {
126                         size = utf8_to_utf32(s, len, &u);
127                         if (size < 0)
128                                 return -EINVAL;
129
130                         if (u >= PLANE_SIZE) {
131                                 u -= PLANE_SIZE;
132                                 *op++ = (wchar_t) (SURROGATE_PAIR |
133                                                 ((u >> 10) & SURROGATE_BITS));
134                                 *op++ = (wchar_t) (SURROGATE_PAIR |
135                                                 SURROGATE_LOW |
136                                                 (u & SURROGATE_BITS));
137                         } else {
138                                 *op++ = (wchar_t) u;
139                         }
140                         s += size;
141                         len -= size;
142                 } else {
143                         *op++ = *s++;
144                         len--;
145                 }
146         }
147         return op - pwcs;
148 }
149 EXPORT_SYMBOL(utf8s_to_utf16s);
150
151 static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
152 {
153         switch (endian) {
154         default:
155                 return c;
156         case UTF16_LITTLE_ENDIAN:
157                 return __le16_to_cpu(c);
158         case UTF16_BIG_ENDIAN:
159                 return __be16_to_cpu(c);
160         }
161 }
162
163 int utf16s_to_utf8s(const wchar_t *pwcs, int len, enum utf16_endian endian,
164                 u8 *s, int maxlen)
165 {
166         u8 *op;
167         int size;
168         unsigned long u, v;
169
170         op = s;
171         while (len > 0 && maxlen > 0) {
172                 u = get_utf16(*pwcs, endian);
173                 if (!u)
174                         break;
175                 pwcs++;
176                 len--;
177                 if (u > 0x7f) {
178                         if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
179                                 if (u & SURROGATE_LOW) {
180                                         /* Ignore character and move on */
181                                         continue;
182                                 }
183                                 if (len <= 0)
184                                         break;
185                                 v = get_utf16(*pwcs, endian);
186                                 if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
187                                                 !(v & SURROGATE_LOW)) {
188                                         /* Ignore character and move on */
189                                         continue;
190                                 }
191                                 u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
192                                                 + (v & SURROGATE_BITS);
193                                 pwcs++;
194                                 len--;
195                         }
196                         size = utf32_to_utf8(u, op, maxlen);
197                         if (size == -1) {
198                                 /* Ignore character and move on */
199                         } else {
200                                 op += size;
201                                 maxlen -= size;
202                         }
203                 } else {
204                         *op++ = (u8) u;
205                         maxlen--;
206                 }
207         }
208         return op - s;
209 }
210 EXPORT_SYMBOL(utf16s_to_utf8s);
211
212 int register_nls(struct nls_table * nls)
213 {
214         struct nls_table ** tmp = &tables;
215
216         if (nls->next)
217                 return -EBUSY;
218
219         spin_lock(&nls_lock);
220         while (*tmp) {
221                 if (nls == *tmp) {
222                         spin_unlock(&nls_lock);
223                         return -EBUSY;
224                 }
225                 tmp = &(*tmp)->next;
226         }
227         nls->next = tables;
228         tables = nls;
229         spin_unlock(&nls_lock);
230         return 0;       
231 }
232
233 int unregister_nls(struct nls_table * nls)
234 {
235         struct nls_table ** tmp = &tables;
236
237         spin_lock(&nls_lock);
238         while (*tmp) {
239                 if (nls == *tmp) {
240                         *tmp = nls->next;
241                         spin_unlock(&nls_lock);
242                         return 0;
243                 }
244                 tmp = &(*tmp)->next;
245         }
246         spin_unlock(&nls_lock);
247         return -EINVAL;
248 }
249
250 static struct nls_table *find_nls(char *charset)
251 {
252         struct nls_table *nls;
253         spin_lock(&nls_lock);
254         for (nls = tables; nls; nls = nls->next) {
255                 if (!strcmp(nls->charset, charset))
256                         break;
257                 if (nls->alias && !strcmp(nls->alias, charset))
258                         break;
259         }
260         if (nls && !try_module_get(nls->owner))
261                 nls = NULL;
262         spin_unlock(&nls_lock);
263         return nls;
264 }
265
266 struct nls_table *load_nls(char *charset)
267 {
268         return try_then_request_module(find_nls(charset), "nls_%s", charset);
269 }
270
271 void unload_nls(struct nls_table *nls)
272 {
273         if (nls)
274                 module_put(nls->owner);
275 }
276
277 static const wchar_t charset2uni[256] = {
278         /* 0x00*/
279         0x0000, 0x0001, 0x0002, 0x0003,
280         0x0004, 0x0005, 0x0006, 0x0007,
281         0x0008, 0x0009, 0x000a, 0x000b,
282         0x000c, 0x000d, 0x000e, 0x000f,
283         /* 0x10*/
284         0x0010, 0x0011, 0x0012, 0x0013,
285         0x0014, 0x0015, 0x0016, 0x0017,
286         0x0018, 0x0019, 0x001a, 0x001b,
287         0x001c, 0x001d, 0x001e, 0x001f,
288         /* 0x20*/
289         0x0020, 0x0021, 0x0022, 0x0023,
290         0x0024, 0x0025, 0x0026, 0x0027,
291         0x0028, 0x0029, 0x002a, 0x002b,
292         0x002c, 0x002d, 0x002e, 0x002f,
293         /* 0x30*/
294         0x0030, 0x0031, 0x0032, 0x0033,
295         0x0034, 0x0035, 0x0036, 0x0037,
296         0x0038, 0x0039, 0x003a, 0x003b,
297         0x003c, 0x003d, 0x003e, 0x003f,
298         /* 0x40*/
299         0x0040, 0x0041, 0x0042, 0x0043,
300         0x0044, 0x0045, 0x0046, 0x0047,
301         0x0048, 0x0049, 0x004a, 0x004b,
302         0x004c, 0x004d, 0x004e, 0x004f,
303         /* 0x50*/
304         0x0050, 0x0051, 0x0052, 0x0053,
305         0x0054, 0x0055, 0x0056, 0x0057,
306         0x0058, 0x0059, 0x005a, 0x005b,
307         0x005c, 0x005d, 0x005e, 0x005f,
308         /* 0x60*/
309         0x0060, 0x0061, 0x0062, 0x0063,
310         0x0064, 0x0065, 0x0066, 0x0067,
311         0x0068, 0x0069, 0x006a, 0x006b,
312         0x006c, 0x006d, 0x006e, 0x006f,
313         /* 0x70*/
314         0x0070, 0x0071, 0x0072, 0x0073,
315         0x0074, 0x0075, 0x0076, 0x0077,
316         0x0078, 0x0079, 0x007a, 0x007b,
317         0x007c, 0x007d, 0x007e, 0x007f,
318         /* 0x80*/
319         0x0080, 0x0081, 0x0082, 0x0083,
320         0x0084, 0x0085, 0x0086, 0x0087,
321         0x0088, 0x0089, 0x008a, 0x008b,
322         0x008c, 0x008d, 0x008e, 0x008f,
323         /* 0x90*/
324         0x0090, 0x0091, 0x0092, 0x0093,
325         0x0094, 0x0095, 0x0096, 0x0097,
326         0x0098, 0x0099, 0x009a, 0x009b,
327         0x009c, 0x009d, 0x009e, 0x009f,
328         /* 0xa0*/
329         0x00a0, 0x00a1, 0x00a2, 0x00a3,
330         0x00a4, 0x00a5, 0x00a6, 0x00a7,
331         0x00a8, 0x00a9, 0x00aa, 0x00ab,
332         0x00ac, 0x00ad, 0x00ae, 0x00af,
333         /* 0xb0*/
334         0x00b0, 0x00b1, 0x00b2, 0x00b3,
335         0x00b4, 0x00b5, 0x00b6, 0x00b7,
336         0x00b8, 0x00b9, 0x00ba, 0x00bb,
337         0x00bc, 0x00bd, 0x00be, 0x00bf,
338         /* 0xc0*/
339         0x00c0, 0x00c1, 0x00c2, 0x00c3,
340         0x00c4, 0x00c5, 0x00c6, 0x00c7,
341         0x00c8, 0x00c9, 0x00ca, 0x00cb,
342         0x00cc, 0x00cd, 0x00ce, 0x00cf,
343         /* 0xd0*/
344         0x00d0, 0x00d1, 0x00d2, 0x00d3,
345         0x00d4, 0x00d5, 0x00d6, 0x00d7,
346         0x00d8, 0x00d9, 0x00da, 0x00db,
347         0x00dc, 0x00dd, 0x00de, 0x00df,
348         /* 0xe0*/
349         0x00e0, 0x00e1, 0x00e2, 0x00e3,
350         0x00e4, 0x00e5, 0x00e6, 0x00e7,
351         0x00e8, 0x00e9, 0x00ea, 0x00eb,
352         0x00ec, 0x00ed, 0x00ee, 0x00ef,
353         /* 0xf0*/
354         0x00f0, 0x00f1, 0x00f2, 0x00f3,
355         0x00f4, 0x00f5, 0x00f6, 0x00f7,
356         0x00f8, 0x00f9, 0x00fa, 0x00fb,
357         0x00fc, 0x00fd, 0x00fe, 0x00ff,
358 };
359
360 static const unsigned char page00[256] = {
361         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
362         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
363         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
364         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
365         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
366         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
367         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
368         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
369         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
370         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
371         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
372         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
373         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
374         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
375         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
376         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
377
378         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
379         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
380         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
381         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
382         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
383         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
384         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
385         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
386         0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
387         0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
388         0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
389         0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
390         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
391         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
392         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
393         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
394 };
395
396 static const unsigned char *const page_uni2charset[256] = {
397         page00
398 };
399
400 static const unsigned char charset2lower[256] = {
401         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
402         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
403         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
404         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
405         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
406         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
407         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
408         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
409         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
410         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
411         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
412         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
413         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
414         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
415         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
416         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
417
418         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
419         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
420         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
421         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
422         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
423         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
424         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
425         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
426         0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
427         0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
428         0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
429         0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
430         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
431         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
432         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
433         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
434 };
435
436 static const unsigned char charset2upper[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, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
446         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
447         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
448         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
449         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
450         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
451         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
452         0x58, 0x59, 0x5a, 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
473 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
474 {
475         const unsigned char *uni2charset;
476         unsigned char cl = uni & 0x00ff;
477         unsigned char ch = (uni & 0xff00) >> 8;
478
479         if (boundlen <= 0)
480                 return -ENAMETOOLONG;
481
482         uni2charset = page_uni2charset[ch];
483         if (uni2charset && uni2charset[cl])
484                 out[0] = uni2charset[cl];
485         else
486                 return -EINVAL;
487         return 1;
488 }
489
490 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
491 {
492         *uni = charset2uni[*rawstring];
493         if (*uni == 0x0000)
494                 return -EINVAL;
495         return 1;
496 }
497
498 static struct nls_table default_table = {
499         .charset        = "default",
500         .uni2char       = uni2char,
501         .char2uni       = char2uni,
502         .charset2lower  = charset2lower,
503         .charset2upper  = charset2upper,
504 };
505
506 /* Returns a simple default translation table */
507 struct nls_table *load_nls_default(void)
508 {
509         struct nls_table *default_nls;
510         
511         default_nls = load_nls(CONFIG_NLS_DEFAULT);
512         if (default_nls != NULL)
513                 return default_nls;
514         else
515                 return &default_table;
516 }
517
518 EXPORT_SYMBOL(register_nls);
519 EXPORT_SYMBOL(unregister_nls);
520 EXPORT_SYMBOL(unload_nls);
521 EXPORT_SYMBOL(load_nls);
522 EXPORT_SYMBOL(load_nls_default);
523
524 MODULE_LICENSE("Dual BSD/GPL");