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 20static struct nls_table default_table; 21static struct nls_table *tables = &default_table; 22static DEFINE_SPINLOCK(nls_lock); 23 24/* 25 * Sample implementation from Unicode home page. 26 * http://www.stonehand.com/unicode/standard/fss-utf.html 27 */ 28struct utf8_table { 29 int cmask; 30 int cval; 31 int shift; 32 long lmask; 33 long lval; 34}; 35 36static 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 55int 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} 84EXPORT_SYMBOL(utf8_to_utf32); 85 86int 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} 115EXPORT_SYMBOL(utf32_to_utf8); 116 117int 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} 149EXPORT_SYMBOL(utf8s_to_utf16s); 150 151static 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 163int 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} 210EXPORT_SYMBOL(utf16s_to_utf8s); 211 212int 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 233int 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 250static 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 266struct nls_table *load_nls(char *charset) 267{ 268 return try_then_request_module(find_nls(charset), "nls_%s", charset); 269} 270 271void unload_nls(struct nls_table *nls) 272{ 273 if (nls) 274 module_put(nls->owner); 275} 276 277static 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 360static 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 396static const unsigned char *const page_uni2charset[256] = { 397 page00 398}; 399 400static 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 436static 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 473static 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 490static 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 498static 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 */ 507struct 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 518EXPORT_SYMBOL(register_nls); 519EXPORT_SYMBOL(unregister_nls); 520EXPORT_SYMBOL(unload_nls); 521EXPORT_SYMBOL(load_nls); 522EXPORT_SYMBOL(load_nls_default); 523 524MODULE_LICENSE("Dual BSD/GPL"); 525