550 lines · c
1/*2 * linux/fs/nls/nls_base.c3 *4 * Native language support--charsets and unicode translations.5 * By Gordon Chaffee 1996, 19976 *7 * Unicode based case conversion 1999 by Wolfram Pienkoss8 *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.html27 */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 0x0010ffff48#define PLANE_SIZE 0x0001000049 50#define SURROGATE_MASK 0xfffff80051#define SURROGATE_PAIR 0x0000d80052#define SURROGATE_LOW 0x0000040053#define SURROGATE_BITS 0x000003ff54 55int 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}84EXPORT_SYMBOL(utf8_to_utf32);85 86int 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}115EXPORT_SYMBOL(utf32_to_utf8);116 117static 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 132int 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}172EXPORT_SYMBOL(utf8s_to_utf16s);173 174static 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 186int 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}233EXPORT_SYMBOL(utf16s_to_utf8s);234 235int __register_nls(struct nls_table *nls, struct module *owner)236{237 struct nls_table ** tmp = &tables;238 239 if (nls->next)240 return -EBUSY;241 242 nls->owner = owner;243 spin_lock(&nls_lock);244 while (*tmp) {245 if (nls == *tmp) {246 spin_unlock(&nls_lock);247 return -EBUSY;248 }249 tmp = &(*tmp)->next;250 }251 nls->next = tables;252 tables = nls;253 spin_unlock(&nls_lock);254 return 0; 255}256EXPORT_SYMBOL(__register_nls);257 258int unregister_nls(struct nls_table * nls)259{260 struct nls_table ** tmp = &tables;261 262 spin_lock(&nls_lock);263 while (*tmp) {264 if (nls == *tmp) {265 *tmp = nls->next;266 spin_unlock(&nls_lock);267 return 0;268 }269 tmp = &(*tmp)->next;270 }271 spin_unlock(&nls_lock);272 return -EINVAL;273}274 275static struct nls_table *find_nls(const char *charset)276{277 struct nls_table *nls;278 spin_lock(&nls_lock);279 for (nls = tables; nls; nls = nls->next) {280 if (!strcmp(nls->charset, charset))281 break;282 if (nls->alias && !strcmp(nls->alias, charset))283 break;284 }285 if (nls && !try_module_get(nls->owner))286 nls = NULL;287 spin_unlock(&nls_lock);288 return nls;289}290 291struct nls_table *load_nls(const char *charset)292{293 return try_then_request_module(find_nls(charset), "nls_%s", charset);294}295 296void unload_nls(struct nls_table *nls)297{298 if (nls)299 module_put(nls->owner);300}301 302static const wchar_t charset2uni[256] = {303 /* 0x00*/304 0x0000, 0x0001, 0x0002, 0x0003,305 0x0004, 0x0005, 0x0006, 0x0007,306 0x0008, 0x0009, 0x000a, 0x000b,307 0x000c, 0x000d, 0x000e, 0x000f,308 /* 0x10*/309 0x0010, 0x0011, 0x0012, 0x0013,310 0x0014, 0x0015, 0x0016, 0x0017,311 0x0018, 0x0019, 0x001a, 0x001b,312 0x001c, 0x001d, 0x001e, 0x001f,313 /* 0x20*/314 0x0020, 0x0021, 0x0022, 0x0023,315 0x0024, 0x0025, 0x0026, 0x0027,316 0x0028, 0x0029, 0x002a, 0x002b,317 0x002c, 0x002d, 0x002e, 0x002f,318 /* 0x30*/319 0x0030, 0x0031, 0x0032, 0x0033,320 0x0034, 0x0035, 0x0036, 0x0037,321 0x0038, 0x0039, 0x003a, 0x003b,322 0x003c, 0x003d, 0x003e, 0x003f,323 /* 0x40*/324 0x0040, 0x0041, 0x0042, 0x0043,325 0x0044, 0x0045, 0x0046, 0x0047,326 0x0048, 0x0049, 0x004a, 0x004b,327 0x004c, 0x004d, 0x004e, 0x004f,328 /* 0x50*/329 0x0050, 0x0051, 0x0052, 0x0053,330 0x0054, 0x0055, 0x0056, 0x0057,331 0x0058, 0x0059, 0x005a, 0x005b,332 0x005c, 0x005d, 0x005e, 0x005f,333 /* 0x60*/334 0x0060, 0x0061, 0x0062, 0x0063,335 0x0064, 0x0065, 0x0066, 0x0067,336 0x0068, 0x0069, 0x006a, 0x006b,337 0x006c, 0x006d, 0x006e, 0x006f,338 /* 0x70*/339 0x0070, 0x0071, 0x0072, 0x0073,340 0x0074, 0x0075, 0x0076, 0x0077,341 0x0078, 0x0079, 0x007a, 0x007b,342 0x007c, 0x007d, 0x007e, 0x007f,343 /* 0x80*/344 0x0080, 0x0081, 0x0082, 0x0083,345 0x0084, 0x0085, 0x0086, 0x0087,346 0x0088, 0x0089, 0x008a, 0x008b,347 0x008c, 0x008d, 0x008e, 0x008f,348 /* 0x90*/349 0x0090, 0x0091, 0x0092, 0x0093,350 0x0094, 0x0095, 0x0096, 0x0097,351 0x0098, 0x0099, 0x009a, 0x009b,352 0x009c, 0x009d, 0x009e, 0x009f,353 /* 0xa0*/354 0x00a0, 0x00a1, 0x00a2, 0x00a3,355 0x00a4, 0x00a5, 0x00a6, 0x00a7,356 0x00a8, 0x00a9, 0x00aa, 0x00ab,357 0x00ac, 0x00ad, 0x00ae, 0x00af,358 /* 0xb0*/359 0x00b0, 0x00b1, 0x00b2, 0x00b3,360 0x00b4, 0x00b5, 0x00b6, 0x00b7,361 0x00b8, 0x00b9, 0x00ba, 0x00bb,362 0x00bc, 0x00bd, 0x00be, 0x00bf,363 /* 0xc0*/364 0x00c0, 0x00c1, 0x00c2, 0x00c3,365 0x00c4, 0x00c5, 0x00c6, 0x00c7,366 0x00c8, 0x00c9, 0x00ca, 0x00cb,367 0x00cc, 0x00cd, 0x00ce, 0x00cf,368 /* 0xd0*/369 0x00d0, 0x00d1, 0x00d2, 0x00d3,370 0x00d4, 0x00d5, 0x00d6, 0x00d7,371 0x00d8, 0x00d9, 0x00da, 0x00db,372 0x00dc, 0x00dd, 0x00de, 0x00df,373 /* 0xe0*/374 0x00e0, 0x00e1, 0x00e2, 0x00e3,375 0x00e4, 0x00e5, 0x00e6, 0x00e7,376 0x00e8, 0x00e9, 0x00ea, 0x00eb,377 0x00ec, 0x00ed, 0x00ee, 0x00ef,378 /* 0xf0*/379 0x00f0, 0x00f1, 0x00f2, 0x00f3,380 0x00f4, 0x00f5, 0x00f6, 0x00f7,381 0x00f8, 0x00f9, 0x00fa, 0x00fb,382 0x00fc, 0x00fd, 0x00fe, 0x00ff,383};384 385static const unsigned char page00[256] = {386 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */387 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */388 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */389 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */390 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */391 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */392 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */393 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */394 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */395 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */396 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */397 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */398 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */399 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */400 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */401 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */402 403 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */404 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */405 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */406 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */407 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */408 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */409 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */410 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */411 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */412 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */413 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */414 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */415 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */416 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */417 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */418 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */419};420 421static const unsigned char *const page_uni2charset[256] = {422 page00423};424 425static const unsigned char charset2lower[256] = {426 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */427 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */428 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */429 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */430 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */431 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */432 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */433 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */434 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */435 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */436 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */437 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */438 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */439 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */440 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */441 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */442 443 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */444 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */445 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */446 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */447 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */448 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */449 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */450 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */451 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */452 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */453 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */454 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */455 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */456 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */457 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */458 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */459};460 461static const unsigned char charset2upper[256] = {462 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */463 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */464 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */465 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */466 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */467 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */468 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */469 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */470 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */471 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */472 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */473 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */474 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */475 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */476 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */477 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */478 479 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */480 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */481 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */482 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */483 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */484 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */485 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */486 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */487 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */488 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */489 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */490 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */491 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */492 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */493 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */494 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */495};496 497 498static int uni2char(wchar_t uni, unsigned char *out, int boundlen)499{500 const unsigned char *uni2charset;501 unsigned char cl = uni & 0x00ff;502 unsigned char ch = (uni & 0xff00) >> 8;503 504 if (boundlen <= 0)505 return -ENAMETOOLONG;506 507 uni2charset = page_uni2charset[ch];508 if (uni2charset && uni2charset[cl])509 out[0] = uni2charset[cl];510 else511 return -EINVAL;512 return 1;513}514 515static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)516{517 *uni = charset2uni[*rawstring];518 if (*uni == 0x0000)519 return -EINVAL;520 return 1;521}522 523static struct nls_table default_table = {524 .charset = "default",525 .uni2char = uni2char,526 .char2uni = char2uni,527 .charset2lower = charset2lower,528 .charset2upper = charset2upper,529};530 531/* Returns a simple default translation table */532struct nls_table *load_nls_default(void)533{534 struct nls_table *default_nls;535 536 default_nls = load_nls(CONFIG_NLS_DEFAULT);537 if (default_nls != NULL)538 return default_nls;539 else540 return &default_table;541}542 543EXPORT_SYMBOL(unregister_nls);544EXPORT_SYMBOL(unload_nls);545EXPORT_SYMBOL(load_nls);546EXPORT_SYMBOL(load_nls_default);547 548MODULE_DESCRIPTION("Base file system native language support");549MODULE_LICENSE("Dual BSD/GPL");550