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