linux/fs/nls/nls_base.c
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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#ifdef CONFIG_KMOD
  17#include <linux/kmod.h>
  18#endif
  19#include <linux/spinlock.h>
  20
  21static struct nls_table default_table;
  22static struct nls_table *tables = &default_table;
  23static DEFINE_SPINLOCK(nls_lock);
  24
  25/*
  26 * Sample implementation from Unicode home page.
  27 * http://www.stonehand.com/unicode/standard/fss-utf.html
  28 */
  29struct utf8_table {
  30        int     cmask;
  31        int     cval;
  32        int     shift;
  33        long    lmask;
  34        long    lval;
  35};
  36
  37static 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
  48int
  49utf8_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
  78int
  79utf8_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
 107int
 108utf8_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
 135int
 136utf8_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
 162int 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
 183int 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
 200static 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
 216struct 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
 238void unload_nls(struct nls_table *nls)
 239{
 240        module_put(nls->owner);
 241}
 242
 243static 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
 326static 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
 362static const unsigned char *const page_uni2charset[256] = {
 363        page00
 364};
 365
 366static 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
 402static 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
 439static 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
 456static 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
 464static 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 */
 473struct 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
 484EXPORT_SYMBOL(register_nls);
 485EXPORT_SYMBOL(unregister_nls);
 486EXPORT_SYMBOL(unload_nls);
 487EXPORT_SYMBOL(load_nls);
 488EXPORT_SYMBOL(load_nls_default);
 489EXPORT_SYMBOL(utf8_mbtowc);
 490EXPORT_SYMBOL(utf8_mbstowcs);
 491EXPORT_SYMBOL(utf8_wctomb);
 492EXPORT_SYMBOL(utf8_wcstombs);
 493
 494MODULE_LICENSE("Dual BSD/GPL");
 495