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nls_base.c
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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(op++, SURROGATE_PAIR |
153  ((u >> 10) & SURROGATE_BITS),
154  endian);
155  put_utf16(op++, SURROGATE_PAIR |
156  SURROGATE_LOW |
157  (u & SURROGATE_BITS),
158  endian);
159  maxout -= 2;
160  } else {
161  put_utf16(op++, u, endian);
162  maxout--;
163  }
164  } else {
165  put_utf16(op++, *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(*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(*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)
236 {
237  struct nls_table ** tmp = &tables;
238 
239  if (nls->next)
240  return -EBUSY;
241 
242  spin_lock(&nls_lock);
243  while (*tmp) {
244  if (nls == *tmp) {
245  spin_unlock(&nls_lock);
246  return -EBUSY;
247  }
248  tmp = &(*tmp)->next;
249  }
250  nls->next = tables;
251  tables = nls;
252  spin_unlock(&nls_lock);
253  return 0;
254 }
255 
256 int unregister_nls(struct nls_table * nls)
257 {
258  struct nls_table ** tmp = &tables;
259 
260  spin_lock(&nls_lock);
261  while (*tmp) {
262  if (nls == *tmp) {
263  *tmp = nls->next;
264  spin_unlock(&nls_lock);
265  return 0;
266  }
267  tmp = &(*tmp)->next;
268  }
269  spin_unlock(&nls_lock);
270  return -EINVAL;
271 }
272 
273 static struct nls_table *find_nls(char *charset)
274 {
275  struct nls_table *nls;
276  spin_lock(&nls_lock);
277  for (nls = tables; nls; nls = nls->next) {
278  if (!strcmp(nls->charset, charset))
279  break;
280  if (nls->alias && !strcmp(nls->alias, charset))
281  break;
282  }
283  if (nls && !try_module_get(nls->owner))
284  nls = NULL;
285  spin_unlock(&nls_lock);
286  return nls;
287 }
288 
289 struct nls_table *load_nls(char *charset)
290 {
291  return try_then_request_module(find_nls(charset), "nls_%s", charset);
292 }
293 
294 void unload_nls(struct nls_table *nls)
295 {
296  if (nls)
297  module_put(nls->owner);
298 }
299 
300 static const wchar_t charset2uni[256] = {
301  /* 0x00*/
302  0x0000, 0x0001, 0x0002, 0x0003,
303  0x0004, 0x0005, 0x0006, 0x0007,
304  0x0008, 0x0009, 0x000a, 0x000b,
305  0x000c, 0x000d, 0x000e, 0x000f,
306  /* 0x10*/
307  0x0010, 0x0011, 0x0012, 0x0013,
308  0x0014, 0x0015, 0x0016, 0x0017,
309  0x0018, 0x0019, 0x001a, 0x001b,
310  0x001c, 0x001d, 0x001e, 0x001f,
311  /* 0x20*/
312  0x0020, 0x0021, 0x0022, 0x0023,
313  0x0024, 0x0025, 0x0026, 0x0027,
314  0x0028, 0x0029, 0x002a, 0x002b,
315  0x002c, 0x002d, 0x002e, 0x002f,
316  /* 0x30*/
317  0x0030, 0x0031, 0x0032, 0x0033,
318  0x0034, 0x0035, 0x0036, 0x0037,
319  0x0038, 0x0039, 0x003a, 0x003b,
320  0x003c, 0x003d, 0x003e, 0x003f,
321  /* 0x40*/
322  0x0040, 0x0041, 0x0042, 0x0043,
323  0x0044, 0x0045, 0x0046, 0x0047,
324  0x0048, 0x0049, 0x004a, 0x004b,
325  0x004c, 0x004d, 0x004e, 0x004f,
326  /* 0x50*/
327  0x0050, 0x0051, 0x0052, 0x0053,
328  0x0054, 0x0055, 0x0056, 0x0057,
329  0x0058, 0x0059, 0x005a, 0x005b,
330  0x005c, 0x005d, 0x005e, 0x005f,
331  /* 0x60*/
332  0x0060, 0x0061, 0x0062, 0x0063,
333  0x0064, 0x0065, 0x0066, 0x0067,
334  0x0068, 0x0069, 0x006a, 0x006b,
335  0x006c, 0x006d, 0x006e, 0x006f,
336  /* 0x70*/
337  0x0070, 0x0071, 0x0072, 0x0073,
338  0x0074, 0x0075, 0x0076, 0x0077,
339  0x0078, 0x0079, 0x007a, 0x007b,
340  0x007c, 0x007d, 0x007e, 0x007f,
341  /* 0x80*/
342  0x0080, 0x0081, 0x0082, 0x0083,
343  0x0084, 0x0085, 0x0086, 0x0087,
344  0x0088, 0x0089, 0x008a, 0x008b,
345  0x008c, 0x008d, 0x008e, 0x008f,
346  /* 0x90*/
347  0x0090, 0x0091, 0x0092, 0x0093,
348  0x0094, 0x0095, 0x0096, 0x0097,
349  0x0098, 0x0099, 0x009a, 0x009b,
350  0x009c, 0x009d, 0x009e, 0x009f,
351  /* 0xa0*/
352  0x00a0, 0x00a1, 0x00a2, 0x00a3,
353  0x00a4, 0x00a5, 0x00a6, 0x00a7,
354  0x00a8, 0x00a9, 0x00aa, 0x00ab,
355  0x00ac, 0x00ad, 0x00ae, 0x00af,
356  /* 0xb0*/
357  0x00b0, 0x00b1, 0x00b2, 0x00b3,
358  0x00b4, 0x00b5, 0x00b6, 0x00b7,
359  0x00b8, 0x00b9, 0x00ba, 0x00bb,
360  0x00bc, 0x00bd, 0x00be, 0x00bf,
361  /* 0xc0*/
362  0x00c0, 0x00c1, 0x00c2, 0x00c3,
363  0x00c4, 0x00c5, 0x00c6, 0x00c7,
364  0x00c8, 0x00c9, 0x00ca, 0x00cb,
365  0x00cc, 0x00cd, 0x00ce, 0x00cf,
366  /* 0xd0*/
367  0x00d0, 0x00d1, 0x00d2, 0x00d3,
368  0x00d4, 0x00d5, 0x00d6, 0x00d7,
369  0x00d8, 0x00d9, 0x00da, 0x00db,
370  0x00dc, 0x00dd, 0x00de, 0x00df,
371  /* 0xe0*/
372  0x00e0, 0x00e1, 0x00e2, 0x00e3,
373  0x00e4, 0x00e5, 0x00e6, 0x00e7,
374  0x00e8, 0x00e9, 0x00ea, 0x00eb,
375  0x00ec, 0x00ed, 0x00ee, 0x00ef,
376  /* 0xf0*/
377  0x00f0, 0x00f1, 0x00f2, 0x00f3,
378  0x00f4, 0x00f5, 0x00f6, 0x00f7,
379  0x00f8, 0x00f9, 0x00fa, 0x00fb,
380  0x00fc, 0x00fd, 0x00fe, 0x00ff,
381 };
382 
383 static const unsigned char page00[256] = {
384  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
385  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
386  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
387  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
388  0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
389  0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
390  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
391  0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
392  0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
393  0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
394  0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
395  0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
396  0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
397  0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
398  0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
399  0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
400 
401  0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
402  0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
403  0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
404  0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
405  0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
406  0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
407  0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
408  0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
409  0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
410  0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
411  0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
412  0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
413  0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
414  0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
415  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
416  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
417 };
418 
419 static const unsigned char *const page_uni2charset[256] = {
420  page00
421 };
422 
423 static const unsigned char charset2lower[256] = {
424  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
425  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
426  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
427  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
428  0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
429  0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
430  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
431  0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
432  0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
433  0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
434  0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
435  0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
436  0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
437  0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
438  0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
439  0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
440 
441  0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
442  0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
443  0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
444  0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
445  0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
446  0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
447  0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
448  0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
449  0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
450  0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
451  0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
452  0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
453  0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
454  0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
455  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
456  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
457 };
458 
459 static const unsigned char charset2upper[256] = {
460  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
461  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
462  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
463  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
464  0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
465  0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
466  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
467  0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
468  0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
469  0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
470  0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
471  0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
472  0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
473  0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
474  0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
475  0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
476 
477  0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
478  0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
479  0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
480  0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
481  0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
482  0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
483  0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
484  0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
485  0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
486  0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
487  0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
488  0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
489  0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
490  0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
491  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
492  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
493 };
494 
495 
496 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
497 {
498  const unsigned char *uni2charset;
499  unsigned char cl = uni & 0x00ff;
500  unsigned char ch = (uni & 0xff00) >> 8;
501 
502  if (boundlen <= 0)
503  return -ENAMETOOLONG;
504 
505  uni2charset = page_uni2charset[ch];
506  if (uni2charset && uni2charset[cl])
507  out[0] = uni2charset[cl];
508  else
509  return -EINVAL;
510  return 1;
511 }
512 
513 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
514 {
515  *uni = charset2uni[*rawstring];
516  if (*uni == 0x0000)
517  return -EINVAL;
518  return 1;
519 }
520 
521 static struct nls_table default_table = {
522  .charset = "default",
523  .uni2char = uni2char,
524  .char2uni = char2uni,
525  .charset2lower = charset2lower,
526  .charset2upper = charset2upper,
527 };
528 
529 /* Returns a simple default translation table */
530 struct nls_table *load_nls_default(void)
531 {
532  struct nls_table *default_nls;
533 
534  default_nls = load_nls(CONFIG_NLS_DEFAULT);
535  if (default_nls != NULL)
536  return default_nls;
537  else
538  return &default_table;
539 }
540 
541 EXPORT_SYMBOL(register_nls);
542 EXPORT_SYMBOL(unregister_nls);
543 EXPORT_SYMBOL(unload_nls);
544 EXPORT_SYMBOL(load_nls);
545 EXPORT_SYMBOL(load_nls_default);
546 
547 MODULE_LICENSE("Dual BSD/GPL");
Generated on Thu Jan 10 2013 14:49:03 for Linux Kernel by   doxygen 1.8.2