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 #ifdef CONFIG_KMOD
  17 #include <linux/kmod.h>
  18 #endif
  19 #include <linux/spinlock.h>
  20
  21 static struct nls_table default_table;
  22 static struct nls_table *tables = &default_table;
  23 static DEFINE_SPINLOCK(nls_lock);
  24
  25 /*
  26  * Sample implementation from Unicode home page.
  27  * http://www.stonehand.com/unicode/standard/fss-utf.html
  28  */
  29 struct utf8_table {
  30         int     cmask;
  31         int     cval;
  32         int     shift;
  33         long    lmask;
  34         long    lval;
  35 };
  36
  37 static const struct utf8_table utf8_table[] =
  38 {
  39     {0x80,  0x00,   0*6,    0x7F,           0,         /* 1 byte sequence */},
  40     {0xE0,  0xC0,   1*6,    0x7FF,          0x80,      /* 2 byte sequence */},
  41     {0xF0,  0xE0,   2*6,    0xFFFF,         0x800,     /* 3 byte sequence */},
  42     {0xF8,  0xF0,   3*6,    0x1FFFFF,       0x10000,   /* 4 byte sequence */},
  43     {0xFC,  0xF8,   4*6,    0x3FFFFFF,      0x200000,  /* 5 byte sequence */},
  44     {0xFE,  0xFC,   5*6,    0x7FFFFFFF,     0x4000000, /* 6 byte sequence */},
  45     {0,                                                /* end of table    */}
  46 };
  47
  48 int
  49 utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
  50 {
  51         long l;
  52         int c0, c, nc;
  53         const struct utf8_table *t;
  54
  55         nc = 0;
  56         c0 = *s;
  57         l = c0;
  58         for (t = utf8_table; t->cmask; t++) {
  59                 nc++;
  60                 if ((c0 & t->cmask) == t->cval) {
  61                         l &= t->lmask;
  62                         if (l < t->lval)
  63                                 return -1;
  64                         *p = l;
  65                         return nc;
  66                 }
  67                 if (n <= nc)
  68                         return -1;
  69                 s++;
  70                 c = (*s ^ 0x80) & 0xFF;
  71                 if (c & 0xC0)
  72                         return -1;
  73                 l = (l << 6) | c;
  74         }
  75         return -1;
  76 }
  77
  78 int
  79 utf8_mbstowcs(wchar_t *pwcs, const __u8 *s, int n)
  80 {
  81         __u16 *op;
  82         const __u8 *ip;
  83         int size;
  84
  85         op = pwcs;
  86         ip = s;
  87         while (*ip && n > 0) {
  88                 if (*ip & 0x80) {
  89                         size = utf8_mbtowc(op, ip, n);
  90                         if (size == -1) {
  91                                 /* Ignore character and move on */
  92                                 ip++;
  93                                 n--;
  94                         } else {
  95                                 op++;
  96                                 ip += size;
  97                                 n -= size;
  98                         }
  99                 } else {
 100                         *op++ = *ip++;
 101                         n--;
 102                 }
 103         }
 104         return (op - pwcs);
 105 }
 106
 107 int
 108 utf8_wctomb(__u8 *s, wchar_t wc, int maxlen)
 109 {
 110         long l;
 111         int c, nc;
 112         const struct utf8_table *t;
 113
 114         if (!s)
 115                 return 0;
 116
 117         l = wc;
 118         nc = 0;
 119         for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
 120                 nc++;
 121                 if (l <= t->lmask) {
 122                         c = t->shift;
 123                         *s = t->cval | (l >> c);
 124                         while (c > 0) {
 125                                 c -= 6;
 126                                 s++;
 127                                 *s = 0x80 | ((l >> c) & 0x3F);
 128                         }
 129                         return nc;
 130                 }
 131         }
 132         return -1;
 133 }
 134
 135 int
 136 utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
 137 {
 138         const __u16 *ip;
 139         __u8 *op;
 140         int size;
 141
 142         op = s;
 143         ip = pwcs;
 144         while (*ip && maxlen > 0) {
 145                 if (*ip > 0x7f) {
 146                         size = utf8_wctomb(op, *ip, maxlen);
 147                         if (size == -1) {
 148                                 /* Ignore character and move on */
 149                                 maxlen--;
 150                         } else {
 151                                 op += size;
 152                                 maxlen -= size;
 153                         }
 154                 } else {
 155                         *op++ = (__u8) *ip;
 156                 }
 157                 ip++;
 158         }
 159         return (op - s);
 160 }
 161
 162 int register_nls(struct nls_table * nls)
 163 {
 164         struct nls_table ** tmp = &tables;
 165
 166         if (nls->next)
 167                 return -EBUSY;
 168
 169         spin_lock(&nls_lock);
 170         while (*tmp) {
 171                 if (nls == *tmp) {
 172                         spin_unlock(&nls_lock);
 173                         return -EBUSY;
 174                 }
 175                 tmp = &(*tmp)->next;
 176         }
 177         nls->next = tables;
 178         tables = nls;
 179         spin_unlock(&nls_lock);
 180         return 0;
 181 }
 182
 183 int unregister_nls(struct nls_table * nls)
 184 {
 185         struct nls_table ** tmp = &tables;
 186
 187         spin_lock(&nls_lock);
 188         while (*tmp) {
 189                 if (nls == *tmp) {
 190                         *tmp = nls->next;
 191                         spin_unlock(&nls_lock);
 192                         return 0;
 193                 }
 194                 tmp = &(*tmp)->next;
 195         }
 196         spin_unlock(&nls_lock);
 197         return -EINVAL;
 198 }
 199
 200 static struct nls_table *find_nls(char *charset)
 201 {
 202         struct nls_table *nls;
 203         spin_lock(&nls_lock);
 204         for (nls = tables; nls; nls = nls->next) {
 205                 if (!strcmp(nls->charset, charset))
 206                         break;
 207                 if (nls->alias && !strcmp(nls->alias, charset))
 208                         break;
 209         }
 210         if (nls && !try_module_get(nls->owner))
 211                 nls = NULL;
 212         spin_unlock(&nls_lock);
 213         return nls;
 214 }
 215
 216 struct nls_table *load_nls(char *charset)
 217 {
 218         struct nls_table *nls;
 219 #ifdef CONFIG_KMOD
 220         int ret;
 221 #endif
 222
 223         nls = find_nls(charset);
 224         if (nls)
 225                 return nls;
 226
 227 #ifdef CONFIG_KMOD
 228         ret = request_module("nls_%s", charset);
 229         if (ret != 0) {
 230                 printk("Unable to load NLS charset %s\n", charset);
 231                 return NULL;
 232         }
 233         nls = find_nls(charset);
 234 #endif
 235         return nls;
 236 }
 237
 238 void unload_nls(struct nls_table *nls)
 239 {
 240         module_put(nls->owner);
 241 }
 242
 243 static const wchar_t charset2uni[256] = {
 244         /* 0x00*/
 245         0x0000, 0x0001, 0x0002, 0x0003,
 246         0x0004, 0x0005, 0x0006, 0x0007,
 247         0x0008, 0x0009, 0x000a, 0x000b,
 248         0x000c, 0x000d, 0x000e, 0x000f,
 249         /* 0x10*/
 250         0x0010, 0x0011, 0x0012, 0x0013,
 251         0x0014, 0x0015, 0x0016, 0x0017,
 252         0x0018, 0x0019, 0x001a, 0x001b,
 253         0x001c, 0x001d, 0x001e, 0x001f,
 254         /* 0x20*/
 255         0x0020, 0x0021, 0x0022, 0x0023,
 256         0x0024, 0x0025, 0x0026, 0x0027,
 257         0x0028, 0x0029, 0x002a, 0x002b,
 258         0x002c, 0x002d, 0x002e, 0x002f,
 259         /* 0x30*/
 260         0x0030, 0x0031, 0x0032, 0x0033,
 261         0x0034, 0x0035, 0x0036, 0x0037,
 262         0x0038, 0x0039, 0x003a, 0x003b,
 263         0x003c, 0x003d, 0x003e, 0x003f,
 264         /* 0x40*/
 265         0x0040, 0x0041, 0x0042, 0x0043,
 266         0x0044, 0x0045, 0x0046, 0x0047,
 267         0x0048, 0x0049, 0x004a, 0x004b,
 268         0x004c, 0x004d, 0x004e, 0x004f,
 269         /* 0x50*/
 270         0x0050, 0x0051, 0x0052, 0x0053,
 271         0x0054, 0x0055, 0x0056, 0x0057,
 272         0x0058, 0x0059, 0x005a, 0x005b,
 273         0x005c, 0x005d, 0x005e, 0x005f,
 274         /* 0x60*/
 275         0x0060, 0x0061, 0x0062, 0x0063,
 276         0x0064, 0x0065, 0x0066, 0x0067,
 277         0x0068, 0x0069, 0x006a, 0x006b,
 278         0x006c, 0x006d, 0x006e, 0x006f,
 279         /* 0x70*/
 280         0x0070, 0x0071, 0x0072, 0x0073,
 281         0x0074, 0x0075, 0x0076, 0x0077,
 282         0x0078, 0x0079, 0x007a, 0x007b,
 283         0x007c, 0x007d, 0x007e, 0x007f,
 284         /* 0x80*/
 285         0x0080, 0x0081, 0x0082, 0x0083,
 286         0x0084, 0x0085, 0x0086, 0x0087,
 287         0x0088, 0x0089, 0x008a, 0x008b,
 288         0x008c, 0x008d, 0x008e, 0x008f,
 289         /* 0x90*/
 290         0x0090, 0x0091, 0x0092, 0x0093,
 291         0x0094, 0x0095, 0x0096, 0x0097,
 292         0x0098, 0x0099, 0x009a, 0x009b,
 293         0x009c, 0x009d, 0x009e, 0x009f,
 294         /* 0xa0*/
 295         0x00a0, 0x00a1, 0x00a2, 0x00a3,
 296         0x00a4, 0x00a5, 0x00a6, 0x00a7,
 297         0x00a8, 0x00a9, 0x00aa, 0x00ab,
 298         0x00ac, 0x00ad, 0x00ae, 0x00af,
 299         /* 0xb0*/
 300         0x00b0, 0x00b1, 0x00b2, 0x00b3,
 301         0x00b4, 0x00b5, 0x00b6, 0x00b7,
 302         0x00b8, 0x00b9, 0x00ba, 0x00bb,
 303         0x00bc, 0x00bd, 0x00be, 0x00bf,
 304         /* 0xc0*/
 305         0x00c0, 0x00c1, 0x00c2, 0x00c3,
 306         0x00c4, 0x00c5, 0x00c6, 0x00c7,
 307         0x00c8, 0x00c9, 0x00ca, 0x00cb,
 308         0x00cc, 0x00cd, 0x00ce, 0x00cf,
 309         /* 0xd0*/
 310         0x00d0, 0x00d1, 0x00d2, 0x00d3,
 311         0x00d4, 0x00d5, 0x00d6, 0x00d7,
 312         0x00d8, 0x00d9, 0x00da, 0x00db,
 313         0x00dc, 0x00dd, 0x00de, 0x00df,
 314         /* 0xe0*/
 315         0x00e0, 0x00e1, 0x00e2, 0x00e3,
 316         0x00e4, 0x00e5, 0x00e6, 0x00e7,
 317         0x00e8, 0x00e9, 0x00ea, 0x00eb,
 318         0x00ec, 0x00ed, 0x00ee, 0x00ef,
 319         /* 0xf0*/
 320         0x00f0, 0x00f1, 0x00f2, 0x00f3,
 321         0x00f4, 0x00f5, 0x00f6, 0x00f7,
 322         0x00f8, 0x00f9, 0x00fa, 0x00fb,
 323         0x00fc, 0x00fd, 0x00fe, 0x00ff,
 324 };
 325
 326 static const unsigned char page00[256] = {
 327         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 328         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 329         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
 330         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
 331         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
 332         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
 333         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
 334         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
 335         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
 336         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
 337         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
 338         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
 339         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
 340         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
 341         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
 342         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 343
 344         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
 345         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
 346         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
 347         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
 348         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
 349         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
 350         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
 351         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
 352         0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
 353         0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
 354         0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
 355         0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
 356         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
 357         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
 358         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
 359         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
 360 };
 361
 362 static const unsigned char *const page_uni2charset[256] = {
 363         page00
 364 };
 365
 366 static const unsigned char charset2lower[256] = {
 367         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 368         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 369         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
 370         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
 371         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
 372         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
 373         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
 374         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
 375         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
 376         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
 377         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
 378         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
 379         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
 380         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
 381         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
 382         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 383
 384         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
 385         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
 386         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
 387         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
 388         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
 389         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
 390         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
 391         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
 392         0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
 393         0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
 394         0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
 395         0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
 396         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
 397         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
 398         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
 399         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
 400 };
 401
 402 static const unsigned char charset2upper[256] = {
 403         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 404         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 405         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
 406         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
 407         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
 408         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
 409         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
 410         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
 411         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
 412         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
 413         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
 414         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
 415         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
 416         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
 417         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
 418         0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 419
 420         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
 421         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
 422         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
 423         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
 424         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
 425         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
 426         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
 427         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
 428         0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
 429         0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
 430         0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
 431         0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
 432         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
 433         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
 434         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
 435         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
 436 };
 437
 438
 439 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
 440 {
 441         const unsigned char *uni2charset;
 442         unsigned char cl = uni & 0x00ff;
 443         unsigned char ch = (uni & 0xff00) >> 8;
 444
 445         if (boundlen <= 0)
 446                 return -ENAMETOOLONG;
 447
 448         uni2charset = page_uni2charset[ch];
 449         if (uni2charset && uni2charset[cl])
 450                 out[0] = uni2charset[cl];
 451         else
 452                 return -EINVAL;
 453         return 1;
 454 }
 455
 456 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
 457 {
 458         *uni = charset2uni[*rawstring];
 459         if (*uni == 0x0000)
 460                 return -EINVAL;
 461         return 1;
 462 }
 463
 464 static struct nls_table default_table = {
 465         .charset        = "default",
 466         .uni2char       = uni2char,
 467         .char2uni       = char2uni,
 468         .charset2lower  = charset2lower,
 469         .charset2upper  = charset2upper,
 470 };
 471
 472 /* Returns a simple default translation table */
 473 struct nls_table *load_nls_default(void)
 474 {
 475         struct nls_table *default_nls;
 476
 477         default_nls = load_nls(CONFIG_NLS_DEFAULT);
 478         if (default_nls != NULL)
 479                 return default_nls;
 480         else
 481                 return &default_table;
 482 }
 483
 484 EXPORT_SYMBOL(register_nls);
 485 EXPORT_SYMBOL(unregister_nls);
 486 EXPORT_SYMBOL(unload_nls);
 487 EXPORT_SYMBOL(load_nls);
 488 EXPORT_SYMBOL(load_nls_default);
 489 EXPORT_SYMBOL(utf8_mbtowc);
 490 EXPORT_SYMBOL(utf8_mbstowcs);
 491 EXPORT_SYMBOL(utf8_wctomb);
 492 EXPORT_SYMBOL(utf8_wcstombs);
 493
 494 MODULE_LICENSE("Dual BSD/GPL");