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#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 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)
 236{
 237        struct nls_table ** tmp = &tables;
 238
 239        if (nls->next)
 240                return -EBUSY;
 241
 242        spin_lock(&nls_lock);
 243        while (*tmp) {
 244                if (nls == *tmp) {
 245                        spin_unlock(&nls_lock);
 246                        return -EBUSY;
 247                }
 248                tmp = &(*tmp)->next;
 249        }
 250        nls->next = tables;
 251        tables = nls;
 252        spin_unlock(&nls_lock);
 253        return 0;       
 254}
 255
 256int unregister_nls(struct nls_table * nls)
 257{
 258        struct nls_table ** tmp = &tables;
 259
 260        spin_lock(&nls_lock);
 261        while (*tmp) {
 262                if (nls == *tmp) {
 263                        *tmp = nls->next;
 264                        spin_unlock(&nls_lock);
 265                        return 0;
 266                }
 267                tmp = &(*tmp)->next;
 268        }
 269        spin_unlock(&nls_lock);
 270        return -EINVAL;
 271}
 272
 273static struct nls_table *find_nls(char *charset)
 274{
 275        struct nls_table *nls;
 276        spin_lock(&nls_lock);
 277        for (nls = tables; nls; nls = nls->next) {
 278                if (!strcmp(nls->charset, charset))
 279                        break;
 280                if (nls->alias && !strcmp(nls->alias, charset))
 281                        break;
 282        }
 283        if (nls && !try_module_get(nls->owner))
 284                nls = NULL;
 285        spin_unlock(&nls_lock);
 286        return nls;
 287}
 288
 289struct nls_table *load_nls(char *charset)
 290{
 291        return try_then_request_module(find_nls(charset), "nls_%s", charset);
 292}
 293
 294void unload_nls(struct nls_table *nls)
 295{
 296        if (nls)
 297                module_put(nls->owner);
 298}
 299
 300static const wchar_t charset2uni[256] = {
 301        /* 0x00*/
 302        0x0000, 0x0001, 0x0002, 0x0003,
 303        0x0004, 0x0005, 0x0006, 0x0007,
 304        0x0008, 0x0009, 0x000a, 0x000b,
 305        0x000c, 0x000d, 0x000e, 0x000f,
 306        /* 0x10*/
 307        0x0010, 0x0011, 0x0012, 0x0013,
 308        0x0014, 0x0015, 0x0016, 0x0017,
 309        0x0018, 0x0019, 0x001a, 0x001b,
 310        0x001c, 0x001d, 0x001e, 0x001f,
 311        /* 0x20*/
 312        0x0020, 0x0021, 0x0022, 0x0023,
 313        0x0024, 0x0025, 0x0026, 0x0027,
 314        0x0028, 0x0029, 0x002a, 0x002b,
 315        0x002c, 0x002d, 0x002e, 0x002f,
 316        /* 0x30*/
 317        0x0030, 0x0031, 0x0032, 0x0033,
 318        0x0034, 0x0035, 0x0036, 0x0037,
 319        0x0038, 0x0039, 0x003a, 0x003b,
 320        0x003c, 0x003d, 0x003e, 0x003f,
 321        /* 0x40*/
 322        0x0040, 0x0041, 0x0042, 0x0043,
 323        0x0044, 0x0045, 0x0046, 0x0047,
 324        0x0048, 0x0049, 0x004a, 0x004b,
 325        0x004c, 0x004d, 0x004e, 0x004f,
 326        /* 0x50*/
 327        0x0050, 0x0051, 0x0052, 0x0053,
 328        0x0054, 0x0055, 0x0056, 0x0057,
 329        0x0058, 0x0059, 0x005a, 0x005b,
 330        0x005c, 0x005d, 0x005e, 0x005f,
 331        /* 0x60*/
 332        0x0060, 0x0061, 0x0062, 0x0063,
 333        0x0064, 0x0065, 0x0066, 0x0067,
 334        0x0068, 0x0069, 0x006a, 0x006b,
 335        0x006c, 0x006d, 0x006e, 0x006f,
 336        /* 0x70*/
 337        0x0070, 0x0071, 0x0072, 0x0073,
 338        0x0074, 0x0075, 0x0076, 0x0077,
 339        0x0078, 0x0079, 0x007a, 0x007b,
 340        0x007c, 0x007d, 0x007e, 0x007f,
 341        /* 0x80*/
 342        0x0080, 0x0081, 0x0082, 0x0083,
 343        0x0084, 0x0085, 0x0086, 0x0087,
 344        0x0088, 0x0089, 0x008a, 0x008b,
 345        0x008c, 0x008d, 0x008e, 0x008f,
 346        /* 0x90*/
 347        0x0090, 0x0091, 0x0092, 0x0093,
 348        0x0094, 0x0095, 0x0096, 0x0097,
 349        0x0098, 0x0099, 0x009a, 0x009b,
 350        0x009c, 0x009d, 0x009e, 0x009f,
 351        /* 0xa0*/
 352        0x00a0, 0x00a1, 0x00a2, 0x00a3,
 353        0x00a4, 0x00a5, 0x00a6, 0x00a7,
 354        0x00a8, 0x00a9, 0x00aa, 0x00ab,
 355        0x00ac, 0x00ad, 0x00ae, 0x00af,
 356        /* 0xb0*/
 357        0x00b0, 0x00b1, 0x00b2, 0x00b3,
 358        0x00b4, 0x00b5, 0x00b6, 0x00b7,
 359        0x00b8, 0x00b9, 0x00ba, 0x00bb,
 360        0x00bc, 0x00bd, 0x00be, 0x00bf,
 361        /* 0xc0*/
 362        0x00c0, 0x00c1, 0x00c2, 0x00c3,
 363        0x00c4, 0x00c5, 0x00c6, 0x00c7,
 364        0x00c8, 0x00c9, 0x00ca, 0x00cb,
 365        0x00cc, 0x00cd, 0x00ce, 0x00cf,
 366        /* 0xd0*/
 367        0x00d0, 0x00d1, 0x00d2, 0x00d3,
 368        0x00d4, 0x00d5, 0x00d6, 0x00d7,
 369        0x00d8, 0x00d9, 0x00da, 0x00db,
 370        0x00dc, 0x00dd, 0x00de, 0x00df,
 371        /* 0xe0*/
 372        0x00e0, 0x00e1, 0x00e2, 0x00e3,
 373        0x00e4, 0x00e5, 0x00e6, 0x00e7,
 374        0x00e8, 0x00e9, 0x00ea, 0x00eb,
 375        0x00ec, 0x00ed, 0x00ee, 0x00ef,
 376        /* 0xf0*/
 377        0x00f0, 0x00f1, 0x00f2, 0x00f3,
 378        0x00f4, 0x00f5, 0x00f6, 0x00f7,
 379        0x00f8, 0x00f9, 0x00fa, 0x00fb,
 380        0x00fc, 0x00fd, 0x00fe, 0x00ff,
 381};
 382
 383static const unsigned char page00[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, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
 397        0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
 398        0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
 399        0x78, 0x79, 0x7a, 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
 419static const unsigned char *const page_uni2charset[256] = {
 420        page00
 421};
 422
 423static const unsigned char charset2lower[256] = {
 424        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 425        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 426        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
 427        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
 428        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
 429        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
 430        0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
 431        0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
 432        0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
 433        0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
 434        0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
 435        0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
 436        0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
 437        0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
 438        0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
 439        0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 440
 441        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
 442        0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
 443        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
 444        0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
 445        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
 446        0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
 447        0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
 448        0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
 449        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
 450        0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
 451        0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
 452        0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
 453        0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
 454        0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
 455        0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
 456        0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
 457};
 458
 459static const unsigned char charset2upper[256] = {
 460        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 461        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 462        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
 463        0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
 464        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
 465        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
 466        0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
 467        0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
 468        0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
 469        0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
 470        0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
 471        0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
 472        0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
 473        0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
 474        0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
 475        0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 476
 477        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
 478        0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
 479        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
 480        0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
 481        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
 482        0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
 483        0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
 484        0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
 485        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
 486        0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
 487        0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
 488        0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
 489        0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
 490        0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
 491        0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
 492        0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
 493};
 494
 495
 496static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
 497{
 498        const unsigned char *uni2charset;
 499        unsigned char cl = uni & 0x00ff;
 500        unsigned char ch = (uni & 0xff00) >> 8;
 501
 502        if (boundlen <= 0)
 503                return -ENAMETOOLONG;
 504
 505        uni2charset = page_uni2charset[ch];
 506        if (uni2charset && uni2charset[cl])
 507                out[0] = uni2charset[cl];
 508        else
 509                return -EINVAL;
 510        return 1;
 511}
 512
 513static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
 514{
 515        *uni = charset2uni[*rawstring];
 516        if (*uni == 0x0000)
 517                return -EINVAL;
 518        return 1;
 519}
 520
 521static struct nls_table default_table = {
 522        .charset        = "default",
 523        .uni2char       = uni2char,
 524        .char2uni       = char2uni,
 525        .charset2lower  = charset2lower,
 526        .charset2upper  = charset2upper,
 527};
 528
 529/* Returns a simple default translation table */
 530struct nls_table *load_nls_default(void)
 531{
 532        struct nls_table *default_nls;
 533        
 534        default_nls = load_nls(CONFIG_NLS_DEFAULT);
 535        if (default_nls != NULL)
 536                return default_nls;
 537        else
 538                return &default_table;
 539}
 540
 541EXPORT_SYMBOL(register_nls);
 542EXPORT_SYMBOL(unregister_nls);
 543EXPORT_SYMBOL(unload_nls);
 544EXPORT_SYMBOL(load_nls);
 545EXPORT_SYMBOL(load_nls_default);
 546
 547MODULE_LICENSE("Dual BSD/GPL");
 548
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