]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/fs/nls/nls_base.c |
1da177e4 LT |
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> | |
1da177e4 LT |
13 | #include <linux/nls.h> |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
1da177e4 | 16 | #include <linux/kmod.h> |
1da177e4 | 17 | #include <linux/spinlock.h> |
74675a58 | 18 | #include <asm/byteorder.h> |
1da177e4 LT |
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 | ||
b9ec0339 | 36 | static const struct utf8_table utf8_table[] = |
1da177e4 LT |
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 | ||
74675a58 AS |
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) | |
1da177e4 | 56 | { |
74675a58 | 57 | unsigned long l; |
1da177e4 | 58 | int c0, c, nc; |
b9ec0339 | 59 | const struct utf8_table *t; |
1da177e4 LT |
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; | |
74675a58 AS |
68 | if (l < t->lval || l > UNICODE_MAX || |
69 | (l & SURROGATE_MASK) == SURROGATE_PAIR) | |
1da177e4 | 70 | return -1; |
74675a58 | 71 | *pu = (unicode_t) l; |
1da177e4 LT |
72 | return nc; |
73 | } | |
74675a58 | 74 | if (len <= nc) |
1da177e4 LT |
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 | } | |
74675a58 | 84 | EXPORT_SYMBOL(utf8_to_utf32); |
1da177e4 | 85 | |
74675a58 | 86 | int utf32_to_utf8(unicode_t u, u8 *s, int maxlen) |
1da177e4 | 87 | { |
74675a58 | 88 | unsigned long l; |
1da177e4 | 89 | int c, nc; |
b9ec0339 | 90 | const struct utf8_table *t; |
74675a58 | 91 | |
c80544dc | 92 | if (!s) |
1da177e4 | 93 | return 0; |
74675a58 AS |
94 | |
95 | l = u; | |
96 | if (l > UNICODE_MAX || (l & SURROGATE_MASK) == SURROGATE_PAIR) | |
97 | return -1; | |
98 | ||
1da177e4 LT |
99 | nc = 0; |
100 | for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) { | |
101 | nc++; | |
102 | if (l <= t->lmask) { | |
103 | c = t->shift; | |
74675a58 | 104 | *s = (u8) (t->cval | (l >> c)); |
1da177e4 LT |
105 | while (c > 0) { |
106 | c -= 6; | |
107 | s++; | |
74675a58 | 108 | *s = (u8) (0x80 | ((l >> c) & 0x3F)); |
1da177e4 LT |
109 | } |
110 | return nc; | |
111 | } | |
112 | } | |
113 | return -1; | |
114 | } | |
74675a58 | 115 | EXPORT_SYMBOL(utf32_to_utf8); |
1da177e4 | 116 | |
74675a58 | 117 | int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs) |
1da177e4 | 118 | { |
74675a58 | 119 | u16 *op; |
1da177e4 | 120 | int size; |
74675a58 AS |
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 | /* Ignore character and move on */ | |
129 | size = 1; | |
130 | } else 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; | |
1da177e4 LT |
169 | |
170 | op = s; | |
74675a58 AS |
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); | |
1da177e4 LT |
197 | if (size == -1) { |
198 | /* Ignore character and move on */ | |
1da177e4 LT |
199 | } else { |
200 | op += size; | |
201 | maxlen -= size; | |
202 | } | |
203 | } else { | |
74675a58 | 204 | *op++ = (u8) u; |
905c02ac | 205 | maxlen--; |
1da177e4 | 206 | } |
1da177e4 | 207 | } |
74675a58 | 208 | return op - s; |
1da177e4 | 209 | } |
74675a58 | 210 | EXPORT_SYMBOL(utf16s_to_utf8s); |
1da177e4 LT |
211 | |
212 | int register_nls(struct nls_table * nls) | |
213 | { | |
214 | struct nls_table ** tmp = &tables; | |
215 | ||
1da177e4 LT |
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 | { | |
5f4123be | 268 | return try_then_request_module(find_nls(charset), "nls_%s", charset); |
1da177e4 LT |
269 | } |
270 | ||
271 | void unload_nls(struct nls_table *nls) | |
272 | { | |
273 | module_put(nls->owner); | |
274 | } | |
275 | ||
b9ec0339 | 276 | static const wchar_t charset2uni[256] = { |
1da177e4 LT |
277 | /* 0x00*/ |
278 | 0x0000, 0x0001, 0x0002, 0x0003, | |
279 | 0x0004, 0x0005, 0x0006, 0x0007, | |
280 | 0x0008, 0x0009, 0x000a, 0x000b, | |
281 | 0x000c, 0x000d, 0x000e, 0x000f, | |
282 | /* 0x10*/ | |
283 | 0x0010, 0x0011, 0x0012, 0x0013, | |
284 | 0x0014, 0x0015, 0x0016, 0x0017, | |
285 | 0x0018, 0x0019, 0x001a, 0x001b, | |
286 | 0x001c, 0x001d, 0x001e, 0x001f, | |
287 | /* 0x20*/ | |
288 | 0x0020, 0x0021, 0x0022, 0x0023, | |
289 | 0x0024, 0x0025, 0x0026, 0x0027, | |
290 | 0x0028, 0x0029, 0x002a, 0x002b, | |
291 | 0x002c, 0x002d, 0x002e, 0x002f, | |
292 | /* 0x30*/ | |
293 | 0x0030, 0x0031, 0x0032, 0x0033, | |
294 | 0x0034, 0x0035, 0x0036, 0x0037, | |
295 | 0x0038, 0x0039, 0x003a, 0x003b, | |
296 | 0x003c, 0x003d, 0x003e, 0x003f, | |
297 | /* 0x40*/ | |
298 | 0x0040, 0x0041, 0x0042, 0x0043, | |
299 | 0x0044, 0x0045, 0x0046, 0x0047, | |
300 | 0x0048, 0x0049, 0x004a, 0x004b, | |
301 | 0x004c, 0x004d, 0x004e, 0x004f, | |
302 | /* 0x50*/ | |
303 | 0x0050, 0x0051, 0x0052, 0x0053, | |
304 | 0x0054, 0x0055, 0x0056, 0x0057, | |
305 | 0x0058, 0x0059, 0x005a, 0x005b, | |
306 | 0x005c, 0x005d, 0x005e, 0x005f, | |
307 | /* 0x60*/ | |
308 | 0x0060, 0x0061, 0x0062, 0x0063, | |
309 | 0x0064, 0x0065, 0x0066, 0x0067, | |
310 | 0x0068, 0x0069, 0x006a, 0x006b, | |
311 | 0x006c, 0x006d, 0x006e, 0x006f, | |
312 | /* 0x70*/ | |
313 | 0x0070, 0x0071, 0x0072, 0x0073, | |
314 | 0x0074, 0x0075, 0x0076, 0x0077, | |
315 | 0x0078, 0x0079, 0x007a, 0x007b, | |
316 | 0x007c, 0x007d, 0x007e, 0x007f, | |
317 | /* 0x80*/ | |
318 | 0x0080, 0x0081, 0x0082, 0x0083, | |
319 | 0x0084, 0x0085, 0x0086, 0x0087, | |
320 | 0x0088, 0x0089, 0x008a, 0x008b, | |
321 | 0x008c, 0x008d, 0x008e, 0x008f, | |
322 | /* 0x90*/ | |
323 | 0x0090, 0x0091, 0x0092, 0x0093, | |
324 | 0x0094, 0x0095, 0x0096, 0x0097, | |
325 | 0x0098, 0x0099, 0x009a, 0x009b, | |
326 | 0x009c, 0x009d, 0x009e, 0x009f, | |
327 | /* 0xa0*/ | |
328 | 0x00a0, 0x00a1, 0x00a2, 0x00a3, | |
329 | 0x00a4, 0x00a5, 0x00a6, 0x00a7, | |
330 | 0x00a8, 0x00a9, 0x00aa, 0x00ab, | |
331 | 0x00ac, 0x00ad, 0x00ae, 0x00af, | |
332 | /* 0xb0*/ | |
333 | 0x00b0, 0x00b1, 0x00b2, 0x00b3, | |
334 | 0x00b4, 0x00b5, 0x00b6, 0x00b7, | |
335 | 0x00b8, 0x00b9, 0x00ba, 0x00bb, | |
336 | 0x00bc, 0x00bd, 0x00be, 0x00bf, | |
337 | /* 0xc0*/ | |
338 | 0x00c0, 0x00c1, 0x00c2, 0x00c3, | |
339 | 0x00c4, 0x00c5, 0x00c6, 0x00c7, | |
340 | 0x00c8, 0x00c9, 0x00ca, 0x00cb, | |
341 | 0x00cc, 0x00cd, 0x00ce, 0x00cf, | |
342 | /* 0xd0*/ | |
343 | 0x00d0, 0x00d1, 0x00d2, 0x00d3, | |
344 | 0x00d4, 0x00d5, 0x00d6, 0x00d7, | |
345 | 0x00d8, 0x00d9, 0x00da, 0x00db, | |
346 | 0x00dc, 0x00dd, 0x00de, 0x00df, | |
347 | /* 0xe0*/ | |
348 | 0x00e0, 0x00e1, 0x00e2, 0x00e3, | |
349 | 0x00e4, 0x00e5, 0x00e6, 0x00e7, | |
350 | 0x00e8, 0x00e9, 0x00ea, 0x00eb, | |
351 | 0x00ec, 0x00ed, 0x00ee, 0x00ef, | |
352 | /* 0xf0*/ | |
353 | 0x00f0, 0x00f1, 0x00f2, 0x00f3, | |
354 | 0x00f4, 0x00f5, 0x00f6, 0x00f7, | |
355 | 0x00f8, 0x00f9, 0x00fa, 0x00fb, | |
356 | 0x00fc, 0x00fd, 0x00fe, 0x00ff, | |
357 | }; | |
358 | ||
b9ec0339 | 359 | static const unsigned char page00[256] = { |
1da177e4 LT |
360 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */ |
361 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */ | |
362 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */ | |
363 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */ | |
364 | 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */ | |
365 | 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */ | |
366 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */ | |
367 | 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */ | |
368 | 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */ | |
369 | 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */ | |
370 | 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */ | |
371 | 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */ | |
372 | 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */ | |
373 | 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */ | |
374 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */ | |
375 | 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */ | |
376 | ||
377 | 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */ | |
378 | 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */ | |
379 | 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */ | |
380 | 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */ | |
381 | 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */ | |
382 | 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */ | |
383 | 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */ | |
384 | 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */ | |
385 | 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */ | |
386 | 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */ | |
387 | 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */ | |
388 | 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */ | |
389 | 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */ | |
390 | 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */ | |
391 | 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */ | |
392 | 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */ | |
393 | }; | |
394 | ||
b9ec0339 | 395 | static const unsigned char *const page_uni2charset[256] = { |
1da177e4 LT |
396 | page00 |
397 | }; | |
398 | ||
b9ec0339 | 399 | static const unsigned char charset2lower[256] = { |
1da177e4 LT |
400 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */ |
401 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */ | |
402 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */ | |
403 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */ | |
404 | 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */ | |
405 | 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */ | |
406 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */ | |
407 | 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */ | |
408 | 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */ | |
409 | 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */ | |
410 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */ | |
411 | 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */ | |
412 | 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */ | |
413 | 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */ | |
414 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */ | |
415 | 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */ | |
416 | ||
417 | 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */ | |
418 | 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */ | |
419 | 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */ | |
420 | 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */ | |
421 | 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */ | |
422 | 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */ | |
423 | 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */ | |
424 | 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */ | |
425 | 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */ | |
426 | 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */ | |
427 | 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */ | |
428 | 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */ | |
429 | 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */ | |
430 | 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */ | |
431 | 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */ | |
432 | 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */ | |
433 | }; | |
434 | ||
b9ec0339 | 435 | static const unsigned char charset2upper[256] = { |
1da177e4 LT |
436 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */ |
437 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */ | |
438 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */ | |
439 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */ | |
440 | 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */ | |
441 | 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */ | |
442 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */ | |
443 | 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */ | |
444 | 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */ | |
445 | 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */ | |
446 | 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */ | |
447 | 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */ | |
448 | 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */ | |
449 | 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */ | |
450 | 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */ | |
451 | 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */ | |
452 | ||
453 | 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */ | |
454 | 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */ | |
455 | 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */ | |
456 | 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */ | |
457 | 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */ | |
458 | 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */ | |
459 | 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */ | |
460 | 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */ | |
461 | 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */ | |
462 | 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */ | |
463 | 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */ | |
464 | 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */ | |
465 | 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */ | |
466 | 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */ | |
467 | 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */ | |
468 | 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */ | |
469 | }; | |
470 | ||
471 | ||
472 | static int uni2char(wchar_t uni, unsigned char *out, int boundlen) | |
473 | { | |
b9ec0339 | 474 | const unsigned char *uni2charset; |
1da177e4 LT |
475 | unsigned char cl = uni & 0x00ff; |
476 | unsigned char ch = (uni & 0xff00) >> 8; | |
477 | ||
478 | if (boundlen <= 0) | |
479 | return -ENAMETOOLONG; | |
480 | ||
481 | uni2charset = page_uni2charset[ch]; | |
482 | if (uni2charset && uni2charset[cl]) | |
483 | out[0] = uni2charset[cl]; | |
484 | else | |
485 | return -EINVAL; | |
486 | return 1; | |
487 | } | |
488 | ||
489 | static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni) | |
490 | { | |
491 | *uni = charset2uni[*rawstring]; | |
492 | if (*uni == 0x0000) | |
493 | return -EINVAL; | |
494 | return 1; | |
495 | } | |
496 | ||
497 | static struct nls_table default_table = { | |
498 | .charset = "default", | |
499 | .uni2char = uni2char, | |
500 | .char2uni = char2uni, | |
501 | .charset2lower = charset2lower, | |
502 | .charset2upper = charset2upper, | |
503 | }; | |
504 | ||
505 | /* Returns a simple default translation table */ | |
506 | struct nls_table *load_nls_default(void) | |
507 | { | |
508 | struct nls_table *default_nls; | |
509 | ||
510 | default_nls = load_nls(CONFIG_NLS_DEFAULT); | |
511 | if (default_nls != NULL) | |
512 | return default_nls; | |
513 | else | |
514 | return &default_table; | |
515 | } | |
516 | ||
517 | EXPORT_SYMBOL(register_nls); | |
518 | EXPORT_SYMBOL(unregister_nls); | |
519 | EXPORT_SYMBOL(unload_nls); | |
520 | EXPORT_SYMBOL(load_nls); | |
521 | EXPORT_SYMBOL(load_nls_default); | |
1da177e4 LT |
522 | |
523 | MODULE_LICENSE("Dual BSD/GPL"); |