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OSCL-LXR
 
 

     

0001 /*
0002  * linux/fs/nls/nls_base.c
0003  *
0004  * Native language support--charsets and unicode translations.
0005  * By Gordon Chaffee 1996, 1997
0006  *
0007  * Unicode based case conversion 1999 by Wolfram Pienkoss
0008  *
0009  */
0010 
0011 #include <linux/module.h>
0012 #include <linux/string.h>
0013 #include <linux/nls.h>
0014 #include <linux/kernel.h>
0015 #include <linux/errno.h>
0016 #include <linux/kmod.h>
0017 #include <linux/spinlock.h>
0018 #include <asm/byteorder.h>
0019 
0020 static struct nls_table default_table;
0021 static struct nls_table *tables = &default_table;
0022 static DEFINE_SPINLOCK(nls_lock);
0023 
0024 /*
0025  * Sample implementation from Unicode home page.
0026  * http://www.stonehand.com/unicode/standard/fss-utf.html
0027  */
0028 struct utf8_table {
0029     int     cmask;
0030     int     cval;
0031     int     shift;
0032     long    lmask;
0033     long    lval;
0034 };
0035 
0036 static const struct utf8_table utf8_table[] =
0037 {
0038     {0x80,  0x00,   0*6,    0x7F,           0,         /* 1 byte sequence */},
0039     {0xE0,  0xC0,   1*6,    0x7FF,          0x80,      /* 2 byte sequence */},
0040     {0xF0,  0xE0,   2*6,    0xFFFF,         0x800,     /* 3 byte sequence */},
0041     {0xF8,  0xF0,   3*6,    0x1FFFFF,       0x10000,   /* 4 byte sequence */},
0042     {0xFC,  0xF8,   4*6,    0x3FFFFFF,      0x200000,  /* 5 byte sequence */},
0043     {0xFE,  0xFC,   5*6,    0x7FFFFFFF,     0x4000000, /* 6 byte sequence */},
0044     {0,                            /* end of table    */}
0045 };
0046 
0047 #define UNICODE_MAX 0x0010ffff
0048 #define PLANE_SIZE  0x00010000
0049 
0050 #define SURROGATE_MASK  0xfffff800
0051 #define SURROGATE_PAIR  0x0000d800
0052 #define SURROGATE_LOW   0x00000400
0053 #define SURROGATE_BITS  0x000003ff
0054 
0055 int utf8_to_utf32(const u8 *s, int inlen, unicode_t *pu)
0056 {
0057     unsigned long l;
0058     int c0, c, nc;
0059     const struct utf8_table *t;
0060   
0061     nc = 0;
0062     c0 = *s;
0063     l = c0;
0064     for (t = utf8_table; t->cmask; t++) {
0065         nc++;
0066         if ((c0 & t->cmask) == t->cval) {
0067             l &= t->lmask;
0068             if (l < t->lval || l > UNICODE_MAX ||
0069                     (l & SURROGATE_MASK) == SURROGATE_PAIR)
0070                 return -1;
0071             *pu = (unicode_t) l;
0072             return nc;
0073         }
0074         if (inlen <= nc)
0075             return -1;
0076         s++;
0077         c = (*s ^ 0x80) & 0xFF;
0078         if (c & 0xC0)
0079             return -1;
0080         l = (l << 6) | c;
0081     }
0082     return -1;
0083 }
0084 EXPORT_SYMBOL(utf8_to_utf32);
0085 
0086 int utf32_to_utf8(unicode_t u, u8 *s, int maxout)
0087 {
0088     unsigned long l;
0089     int c, nc;
0090     const struct utf8_table *t;
0091 
0092     if (!s)
0093         return 0;
0094 
0095     l = u;
0096     if (l > UNICODE_MAX || (l & SURROGATE_MASK) == SURROGATE_PAIR)
0097         return -1;
0098 
0099     nc = 0;
0100     for (t = utf8_table; t->cmask && maxout; t++, maxout--) {
0101         nc++;
0102         if (l <= t->lmask) {
0103             c = t->shift;
0104             *s = (u8) (t->cval | (l >> c));
0105             while (c > 0) {
0106                 c -= 6;
0107                 s++;
0108                 *s = (u8) (0x80 | ((l >> c) & 0x3F));
0109             }
0110             return nc;
0111         }
0112     }
0113     return -1;
0114 }
0115 EXPORT_SYMBOL(utf32_to_utf8);
0116 
0117 static inline void put_utf16(wchar_t *s, unsigned c, enum utf16_endian endian)
0118 {
0119     switch (endian) {
0120     default:
0121         *s = (wchar_t) c;
0122         break;
0123     case UTF16_LITTLE_ENDIAN:
0124         *s = __cpu_to_le16(c);
0125         break;
0126     case UTF16_BIG_ENDIAN:
0127         *s = __cpu_to_be16(c);
0128         break;
0129     }
0130 }
0131 
0132 int utf8s_to_utf16s(const u8 *s, int inlen, enum utf16_endian endian,
0133         wchar_t *pwcs, int maxout)
0134 {
0135     u16 *op;
0136     int size;
0137     unicode_t u;
0138 
0139     op = pwcs;
0140     while (inlen > 0 && maxout > 0 && *s) {
0141         if (*s & 0x80) {
0142             size = utf8_to_utf32(s, inlen, &u);
0143             if (size < 0)
0144                 return -EINVAL;
0145             s += size;
0146             inlen -= size;
0147 
0148             if (u >= PLANE_SIZE) {
0149                 if (maxout < 2)
0150                     break;
0151                 u -= PLANE_SIZE;
0152                 put_utf16(op++, SURROGATE_PAIR |
0153                         ((u >> 10) & SURROGATE_BITS),
0154                         endian);
0155                 put_utf16(op++, SURROGATE_PAIR |
0156                         SURROGATE_LOW |
0157                         (u & SURROGATE_BITS),
0158                         endian);
0159                 maxout -= 2;
0160             } else {
0161                 put_utf16(op++, u, endian);
0162                 maxout--;
0163             }
0164         } else {
0165             put_utf16(op++, *s++, endian);
0166             inlen--;
0167             maxout--;
0168         }
0169     }
0170     return op - pwcs;
0171 }
0172 EXPORT_SYMBOL(utf8s_to_utf16s);
0173 
0174 static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
0175 {
0176     switch (endian) {
0177     default:
0178         return c;
0179     case UTF16_LITTLE_ENDIAN:
0180         return __le16_to_cpu(c);
0181     case UTF16_BIG_ENDIAN:
0182         return __be16_to_cpu(c);
0183     }
0184 }
0185 
0186 int utf16s_to_utf8s(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
0187         u8 *s, int maxout)
0188 {
0189     u8 *op;
0190     int size;
0191     unsigned long u, v;
0192 
0193     op = s;
0194     while (inlen > 0 && maxout > 0) {
0195         u = get_utf16(*pwcs, endian);
0196         if (!u)
0197             break;
0198         pwcs++;
0199         inlen--;
0200         if (u > 0x7f) {
0201             if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
0202                 if (u & SURROGATE_LOW) {
0203                     /* Ignore character and move on */
0204                     continue;
0205                 }
0206                 if (inlen <= 0)
0207                     break;
0208                 v = get_utf16(*pwcs, endian);
0209                 if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
0210                         !(v & SURROGATE_LOW)) {
0211                     /* Ignore character and move on */
0212                     continue;
0213                 }
0214                 u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
0215                         + (v & SURROGATE_BITS);
0216                 pwcs++;
0217                 inlen--;
0218             }
0219             size = utf32_to_utf8(u, op, maxout);
0220             if (size == -1) {
0221                 /* Ignore character and move on */
0222             } else {
0223                 op += size;
0224                 maxout -= size;
0225             }
0226         } else {
0227             *op++ = (u8) u;
0228             maxout--;
0229         }
0230     }
0231     return op - s;
0232 }
0233 EXPORT_SYMBOL(utf16s_to_utf8s);
0234 
0235 int __register_nls(struct nls_table *nls, struct module *owner)
0236 {
0237     struct nls_table ** tmp = &tables;
0238 
0239     if (nls->next)
0240         return -EBUSY;
0241 
0242     nls->owner = owner;
0243     spin_lock(&nls_lock);
0244     while (*tmp) {
0245         if (nls == *tmp) {
0246             spin_unlock(&nls_lock);
0247             return -EBUSY;
0248         }
0249         tmp = &(*tmp)->next;
0250     }
0251     nls->next = tables;
0252     tables = nls;
0253     spin_unlock(&nls_lock);
0254     return 0;   
0255 }
0256 EXPORT_SYMBOL(__register_nls);
0257 
0258 int unregister_nls(struct nls_table * nls)
0259 {
0260     struct nls_table ** tmp = &tables;
0261 
0262     spin_lock(&nls_lock);
0263     while (*tmp) {
0264         if (nls == *tmp) {
0265             *tmp = nls->next;
0266             spin_unlock(&nls_lock);
0267             return 0;
0268         }
0269         tmp = &(*tmp)->next;
0270     }
0271     spin_unlock(&nls_lock);
0272     return -EINVAL;
0273 }
0274 
0275 static struct nls_table *find_nls(char *charset)
0276 {
0277     struct nls_table *nls;
0278     spin_lock(&nls_lock);
0279     for (nls = tables; nls; nls = nls->next) {
0280         if (!strcmp(nls->charset, charset))
0281             break;
0282         if (nls->alias && !strcmp(nls->alias, charset))
0283             break;
0284     }
0285     if (nls && !try_module_get(nls->owner))
0286         nls = NULL;
0287     spin_unlock(&nls_lock);
0288     return nls;
0289 }
0290 
0291 struct nls_table *load_nls(char *charset)
0292 {
0293     return try_then_request_module(find_nls(charset), "nls_%s", charset);
0294 }
0295 
0296 void unload_nls(struct nls_table *nls)
0297 {
0298     if (nls)
0299         module_put(nls->owner);
0300 }
0301 
0302 static const wchar_t charset2uni[256] = {
0303     /* 0x00*/
0304     0x0000, 0x0001, 0x0002, 0x0003,
0305     0x0004, 0x0005, 0x0006, 0x0007,
0306     0x0008, 0x0009, 0x000a, 0x000b,
0307     0x000c, 0x000d, 0x000e, 0x000f,
0308     /* 0x10*/
0309     0x0010, 0x0011, 0x0012, 0x0013,
0310     0x0014, 0x0015, 0x0016, 0x0017,
0311     0x0018, 0x0019, 0x001a, 0x001b,
0312     0x001c, 0x001d, 0x001e, 0x001f,
0313     /* 0x20*/
0314     0x0020, 0x0021, 0x0022, 0x0023,
0315     0x0024, 0x0025, 0x0026, 0x0027,
0316     0x0028, 0x0029, 0x002a, 0x002b,
0317     0x002c, 0x002d, 0x002e, 0x002f,
0318     /* 0x30*/
0319     0x0030, 0x0031, 0x0032, 0x0033,
0320     0x0034, 0x0035, 0x0036, 0x0037,
0321     0x0038, 0x0039, 0x003a, 0x003b,
0322     0x003c, 0x003d, 0x003e, 0x003f,
0323     /* 0x40*/
0324     0x0040, 0x0041, 0x0042, 0x0043,
0325     0x0044, 0x0045, 0x0046, 0x0047,
0326     0x0048, 0x0049, 0x004a, 0x004b,
0327     0x004c, 0x004d, 0x004e, 0x004f,
0328     /* 0x50*/
0329     0x0050, 0x0051, 0x0052, 0x0053,
0330     0x0054, 0x0055, 0x0056, 0x0057,
0331     0x0058, 0x0059, 0x005a, 0x005b,
0332     0x005c, 0x005d, 0x005e, 0x005f,
0333     /* 0x60*/
0334     0x0060, 0x0061, 0x0062, 0x0063,
0335     0x0064, 0x0065, 0x0066, 0x0067,
0336     0x0068, 0x0069, 0x006a, 0x006b,
0337     0x006c, 0x006d, 0x006e, 0x006f,
0338     /* 0x70*/
0339     0x0070, 0x0071, 0x0072, 0x0073,
0340     0x0074, 0x0075, 0x0076, 0x0077,
0341     0x0078, 0x0079, 0x007a, 0x007b,
0342     0x007c, 0x007d, 0x007e, 0x007f,
0343     /* 0x80*/
0344     0x0080, 0x0081, 0x0082, 0x0083,
0345     0x0084, 0x0085, 0x0086, 0x0087,
0346     0x0088, 0x0089, 0x008a, 0x008b,
0347     0x008c, 0x008d, 0x008e, 0x008f,
0348     /* 0x90*/
0349     0x0090, 0x0091, 0x0092, 0x0093,
0350     0x0094, 0x0095, 0x0096, 0x0097,
0351     0x0098, 0x0099, 0x009a, 0x009b,
0352     0x009c, 0x009d, 0x009e, 0x009f,
0353     /* 0xa0*/
0354     0x00a0, 0x00a1, 0x00a2, 0x00a3,
0355     0x00a4, 0x00a5, 0x00a6, 0x00a7,
0356     0x00a8, 0x00a9, 0x00aa, 0x00ab,
0357     0x00ac, 0x00ad, 0x00ae, 0x00af,
0358     /* 0xb0*/
0359     0x00b0, 0x00b1, 0x00b2, 0x00b3,
0360     0x00b4, 0x00b5, 0x00b6, 0x00b7,
0361     0x00b8, 0x00b9, 0x00ba, 0x00bb,
0362     0x00bc, 0x00bd, 0x00be, 0x00bf,
0363     /* 0xc0*/
0364     0x00c0, 0x00c1, 0x00c2, 0x00c3,
0365     0x00c4, 0x00c5, 0x00c6, 0x00c7,
0366     0x00c8, 0x00c9, 0x00ca, 0x00cb,
0367     0x00cc, 0x00cd, 0x00ce, 0x00cf,
0368     /* 0xd0*/
0369     0x00d0, 0x00d1, 0x00d2, 0x00d3,
0370     0x00d4, 0x00d5, 0x00d6, 0x00d7,
0371     0x00d8, 0x00d9, 0x00da, 0x00db,
0372     0x00dc, 0x00dd, 0x00de, 0x00df,
0373     /* 0xe0*/
0374     0x00e0, 0x00e1, 0x00e2, 0x00e3,
0375     0x00e4, 0x00e5, 0x00e6, 0x00e7,
0376     0x00e8, 0x00e9, 0x00ea, 0x00eb,
0377     0x00ec, 0x00ed, 0x00ee, 0x00ef,
0378     /* 0xf0*/
0379     0x00f0, 0x00f1, 0x00f2, 0x00f3,
0380     0x00f4, 0x00f5, 0x00f6, 0x00f7,
0381     0x00f8, 0x00f9, 0x00fa, 0x00fb,
0382     0x00fc, 0x00fd, 0x00fe, 0x00ff,
0383 };
0384 
0385 static const unsigned char page00[256] = {
0386     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
0387     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
0388     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
0389     0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
0390     0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
0391     0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
0392     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
0393     0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
0394     0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
0395     0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
0396     0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
0397     0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
0398     0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
0399     0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
0400     0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
0401     0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
0402 
0403     0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
0404     0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
0405     0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
0406     0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
0407     0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
0408     0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
0409     0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
0410     0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
0411     0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
0412     0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
0413     0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
0414     0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
0415     0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
0416     0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
0417     0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
0418     0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
0419 };
0420 
0421 static const unsigned char *const page_uni2charset[256] = {
0422     page00
0423 };
0424 
0425 static const unsigned char charset2lower[256] = {
0426     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
0427     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
0428     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
0429     0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
0430     0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
0431     0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
0432     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
0433     0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
0434     0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
0435     0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
0436     0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
0437     0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
0438     0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
0439     0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
0440     0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
0441     0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
0442 
0443     0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
0444     0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
0445     0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
0446     0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
0447     0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
0448     0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
0449     0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
0450     0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
0451     0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
0452     0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
0453     0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
0454     0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
0455     0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
0456     0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
0457     0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
0458     0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
0459 };
0460 
0461 static const unsigned char charset2upper[256] = {
0462     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
0463     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
0464     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
0465     0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
0466     0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
0467     0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
0468     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
0469     0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
0470     0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
0471     0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
0472     0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
0473     0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
0474     0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
0475     0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
0476     0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
0477     0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
0478 
0479     0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
0480     0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
0481     0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
0482     0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
0483     0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
0484     0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
0485     0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
0486     0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
0487     0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
0488     0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
0489     0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
0490     0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
0491     0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
0492     0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
0493     0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
0494     0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
0495 };
0496 
0497 
0498 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
0499 {
0500     const unsigned char *uni2charset;
0501     unsigned char cl = uni & 0x00ff;
0502     unsigned char ch = (uni & 0xff00) >> 8;
0503 
0504     if (boundlen <= 0)
0505         return -ENAMETOOLONG;
0506 
0507     uni2charset = page_uni2charset[ch];
0508     if (uni2charset && uni2charset[cl])
0509         out[0] = uni2charset[cl];
0510     else
0511         return -EINVAL;
0512     return 1;
0513 }
0514 
0515 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
0516 {
0517     *uni = charset2uni[*rawstring];
0518     if (*uni == 0x0000)
0519         return -EINVAL;
0520     return 1;
0521 }
0522 
0523 static struct nls_table default_table = {
0524     .charset    = "default",
0525     .uni2char   = uni2char,
0526     .char2uni   = char2uni,
0527     .charset2lower  = charset2lower,
0528     .charset2upper  = charset2upper,
0529 };
0530 
0531 /* Returns a simple default translation table */
0532 struct nls_table *load_nls_default(void)
0533 {
0534     struct nls_table *default_nls;
0535     
0536     default_nls = load_nls(CONFIG_NLS_DEFAULT);
0537     if (default_nls != NULL)
0538         return default_nls;
0539     else
0540         return &default_table;
0541 }
0542 
0543 EXPORT_SYMBOL(unregister_nls);
0544 EXPORT_SYMBOL(unload_nls);
0545 EXPORT_SYMBOL(load_nls);
0546 EXPORT_SYMBOL(load_nls_default);
0547 
0548 MODULE_LICENSE("Dual BSD/GPL");
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