1/*
2 * linux/fs/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/version.h>
12#include <linux/module.h>
13#include <linux/string.h>
14#include <linux/config.h>
15#include <linux/nls.h>
16#include <linux/slab.h>
17#include <linux/errno.h>
18#ifdef CONFIG_KMOD
19#include <linux/kmod.h>
20#endif
21#include <linux/spinlock.h>
22
23static struct nls_table *tables;
24static spinlock_t nls_lock = SPIN_LOCK_UNLOCKED;
25
26/*
27 * Sample implementation from Unicode home page.
28 * http://www.stonehand.com/unicode/standard/fss-utf.html
29 */
30struct utf8_table {
31	int     cmask;
32	int     cval;
33	int     shift;
34	long    lmask;
35	long    lval;
36};
37
38static struct utf8_table utf8_table[] =
39{
40    {0x80,  0x00,   0*6,    0x7F,           0,         /* 1 byte sequence */},
41    {0xE0,  0xC0,   1*6,    0x7FF,          0x80,      /* 2 byte sequence */},
42    {0xF0,  0xE0,   2*6,    0xFFFF,         0x800,     /* 3 byte sequence */},
43    {0xF8,  0xF0,   3*6,    0x1FFFFF,       0x10000,   /* 4 byte sequence */},
44    {0xFC,  0xF8,   4*6,    0x3FFFFFF,      0x200000,  /* 5 byte sequence */},
45    {0xFE,  0xFC,   5*6,    0x7FFFFFFF,     0x4000000, /* 6 byte sequence */},
46    {0,						       /* end of table    */}
47};
48
49int
50utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
51{
52	long l;
53	int c0, c, nc;
54	struct utf8_table *t;
55
56	nc = 0;
57	c0 = *s;
58	l = c0;
59	for (t = utf8_table; t->cmask; t++) {
60		nc++;
61		if ((c0 & t->cmask) == t->cval) {
62			l &= t->lmask;
63			if (l < t->lval)
64				return -1;
65			*p = l;
66			return nc;
67		}
68		if (n <= nc)
69			return -1;
70		s++;
71		c = (*s ^ 0x80) & 0xFF;
72		if (c & 0xC0)
73			return -1;
74		l = (l << 6) | c;
75	}
76	return -1;
77}
78
79int
80utf8_mbstowcs(wchar_t *pwcs, const __u8 *s, int n)
81{
82	__u16 *op;
83	const __u8 *ip;
84	int size;
85
86	op = pwcs;
87	ip = s;
88	while (*ip && n > 0) {
89		if (*ip & 0x80) {
90			size = utf8_mbtowc(op, ip, n);
91			if (size == -1) {
92				/* Ignore character and move on */
93				ip++;
94				n--;
95			} else {
96				op++;
97				ip += size;
98				n -= size;
99			}
100		} else {
101			*op++ = *ip++;
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	struct utf8_table *t;
113
114	if (s == 0)
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)
167		return -EINVAL;
168	if (nls->next)
169		return -EBUSY;
170
171	spin_lock(&nls_lock);
172	while (*tmp) {
173		if (nls == *tmp) {
174			spin_unlock(&nls_lock);
175			return -EBUSY;
176		}
177		tmp = &(*tmp)->next;
178	}
179	nls->next = tables;
180	tables = nls;
181	spin_unlock(&nls_lock);
182	return 0;
183}
184
185int unregister_nls(struct nls_table * nls)
186{
187	struct nls_table ** tmp = &tables;
188
189	spin_lock(&nls_lock);
190	while (*tmp) {
191		if (nls == *tmp) {
192			*tmp = nls->next;
193			spin_unlock(&nls_lock);
194			return 0;
195		}
196		tmp = &(*tmp)->next;
197	}
198	spin_unlock(&nls_lock);
199	return -EINVAL;
200}
201
202static struct nls_table *find_nls(char *charset)
203{
204	struct nls_table *nls;
205	spin_lock(&nls_lock);
206	for (nls = tables; nls; nls = nls->next)
207		if (! strcmp(nls->charset, charset))
208			break;
209	if (nls && !try_inc_mod_count(nls->owner))
210		nls = NULL;
211	spin_unlock(&nls_lock);
212	return nls;
213}
214
215struct nls_table *load_nls(char *charset)
216{
217	struct nls_table *nls;
218#ifdef CONFIG_KMOD
219	char buf[40];
220	int ret;
221#endif
222
223	nls = find_nls(charset);
224	if (nls)
225		return nls;
226
227#ifdef CONFIG_KMOD
228	if (strlen(charset) > sizeof(buf) - sizeof("nls_")) {
229		printk("Unable to load NLS charset %s: name too long\n",
230			charset);
231		return NULL;
232	}
233
234	sprintf(buf, "nls_%s", charset);
235	ret = request_module(buf);
236	if (ret != 0) {
237		printk("Unable to load NLS charset %s\n", charset);
238		return NULL;
239	}
240	nls = find_nls(charset);
241#endif
242	return nls;
243}
244
245void unload_nls(struct nls_table *nls)
246{
247	if (nls->owner)
248		__MOD_DEC_USE_COUNT(nls->owner);
249}
250
251wchar_t charset2uni[256] = {
252	/* 0x00*/
253	0x0000, 0x0001, 0x0002, 0x0003,
254	0x0004, 0x0005, 0x0006, 0x0007,
255	0x0008, 0x0009, 0x000a, 0x000b,
256	0x000c, 0x000d, 0x000e, 0x000f,
257	/* 0x10*/
258	0x0010, 0x0011, 0x0012, 0x0013,
259	0x0014, 0x0015, 0x0016, 0x0017,
260	0x0018, 0x0019, 0x001a, 0x001b,
261	0x001c, 0x001d, 0x001e, 0x001f,
262	/* 0x20*/
263	0x0020, 0x0021, 0x0022, 0x0023,
264	0x0024, 0x0025, 0x0026, 0x0027,
265	0x0028, 0x0029, 0x002a, 0x002b,
266	0x002c, 0x002d, 0x002e, 0x002f,
267	/* 0x30*/
268	0x0030, 0x0031, 0x0032, 0x0033,
269	0x0034, 0x0035, 0x0036, 0x0037,
270	0x0038, 0x0039, 0x003a, 0x003b,
271	0x003c, 0x003d, 0x003e, 0x003f,
272	/* 0x40*/
273	0x0040, 0x0041, 0x0042, 0x0043,
274	0x0044, 0x0045, 0x0046, 0x0047,
275	0x0048, 0x0049, 0x004a, 0x004b,
276	0x004c, 0x004d, 0x004e, 0x004f,
277	/* 0x50*/
278	0x0050, 0x0051, 0x0052, 0x0053,
279	0x0054, 0x0055, 0x0056, 0x0057,
280	0x0058, 0x0059, 0x005a, 0x005b,
281	0x005c, 0x005d, 0x005e, 0x005f,
282	/* 0x60*/
283	0x0060, 0x0061, 0x0062, 0x0063,
284	0x0064, 0x0065, 0x0066, 0x0067,
285	0x0068, 0x0069, 0x006a, 0x006b,
286	0x006c, 0x006d, 0x006e, 0x006f,
287	/* 0x70*/
288	0x0070, 0x0071, 0x0072, 0x0073,
289	0x0074, 0x0075, 0x0076, 0x0077,
290	0x0078, 0x0079, 0x007a, 0x007b,
291	0x007c, 0x007d, 0x007e, 0x007f,
292	/* 0x80*/
293	0x0080, 0x0081, 0x0082, 0x0083,
294	0x0084, 0x0085, 0x0086, 0x0087,
295	0x0088, 0x0089, 0x008a, 0x008b,
296	0x008c, 0x008d, 0x008e, 0x008f,
297	/* 0x90*/
298	0x0090, 0x0091, 0x0092, 0x0093,
299	0x0094, 0x0095, 0x0096, 0x0097,
300	0x0098, 0x0099, 0x009a, 0x009b,
301	0x009c, 0x009d, 0x009e, 0x009f,
302	/* 0xa0*/
303	0x00a0, 0x00a1, 0x00a2, 0x00a3,
304	0x00a4, 0x00a5, 0x00a6, 0x00a7,
305	0x00a8, 0x00a9, 0x00aa, 0x00ab,
306	0x00ac, 0x00ad, 0x00ae, 0x00af,
307	/* 0xb0*/
308	0x00b0, 0x00b1, 0x00b2, 0x00b3,
309	0x00b4, 0x00b5, 0x00b6, 0x00b7,
310	0x00b8, 0x00b9, 0x00ba, 0x00bb,
311	0x00bc, 0x00bd, 0x00be, 0x00bf,
312	/* 0xc0*/
313	0x00c0, 0x00c1, 0x00c2, 0x00c3,
314	0x00c4, 0x00c5, 0x00c6, 0x00c7,
315	0x00c8, 0x00c9, 0x00ca, 0x00cb,
316	0x00cc, 0x00cd, 0x00ce, 0x00cf,
317	/* 0xd0*/
318	0x00d0, 0x00d1, 0x00d2, 0x00d3,
319	0x00d4, 0x00d5, 0x00d6, 0x00d7,
320	0x00d8, 0x00d9, 0x00da, 0x00db,
321	0x00dc, 0x00dd, 0x00de, 0x00df,
322	/* 0xe0*/
323	0x00e0, 0x00e1, 0x00e2, 0x00e3,
324	0x00e4, 0x00e5, 0x00e6, 0x00e7,
325	0x00e8, 0x00e9, 0x00ea, 0x00eb,
326	0x00ec, 0x00ed, 0x00ee, 0x00ef,
327	/* 0xf0*/
328	0x00f0, 0x00f1, 0x00f2, 0x00f3,
329	0x00f4, 0x00f5, 0x00f6, 0x00f7,
330	0x00f8, 0x00f9, 0x00fa, 0x00fb,
331	0x00fc, 0x00fd, 0x00fe, 0x00ff,
332};
333
334static unsigned char page00[256] = {
335	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
336	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
337	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
338	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
339	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
340	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
341	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
342	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
343	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
344	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
345	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
346	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
347	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
348	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
349	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
350	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
351
352	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
353	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
354	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
355	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
356	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
357	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
358	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
359	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
360	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
361	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
362	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
363	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
364	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
365	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
366	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
367	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
368};
369
370static unsigned char *page_uni2charset[256] = {
371	page00
372};
373
374static unsigned char charset2lower[256] = {
375	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
376	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
377	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
378	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
379	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
380	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
381	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
382	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
383	0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
384	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
385	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
386	0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
387	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
388	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
389	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
390	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
391
392	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
393	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
394	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
395	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
396	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
397	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
398	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
399	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
400	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
401	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
402	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
403	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
404	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
405	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
406	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
407	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
408};
409
410static unsigned char charset2upper[256] = {
411	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
412	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
413	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
414	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
415	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
416	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
417	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
418	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
419	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
420	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
421	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
422	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
423	0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
424	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
425	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
426	0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
427
428	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
429	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
430	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
431	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
432	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
433	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
434	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
435	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
436	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
437	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
438	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
439	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
440	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
441	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
442	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
443	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
444};
445
446
447static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
448{
449	unsigned char *uni2charset;
450	unsigned char cl = uni & 0x00ff;
451	unsigned char ch = (uni & 0xff00) >> 8;
452
453	if (boundlen <= 0)
454		return -ENAMETOOLONG;
455
456	uni2charset = page_uni2charset[ch];
457	if (uni2charset && uni2charset[cl])
458		out[0] = uni2charset[cl];
459	else
460		return -EINVAL;
461	return 1;
462}
463
464static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
465{
466	*uni = charset2uni[*rawstring];
467	if (*uni == 0x0000)
468		return -EINVAL;
469	return 1;
470}
471
472static struct nls_table default_table = {
473	"default",
474	uni2char,
475	char2uni,
476	charset2lower,
477	charset2upper,
478	NULL,
479};
480
481/* Returns a simple default translation table */
482struct nls_table *load_nls_default(void)
483{
484	struct nls_table *default_nls;
485
486	default_nls = load_nls(CONFIG_NLS_DEFAULT);
487	if (default_nls != NULL)
488		return default_nls;
489	else
490               return &default_table;
491}
492
493EXPORT_SYMBOL(register_nls);
494EXPORT_SYMBOL(unregister_nls);
495EXPORT_SYMBOL(unload_nls);
496EXPORT_SYMBOL(load_nls);
497EXPORT_SYMBOL(load_nls_default);
498EXPORT_SYMBOL(utf8_mbtowc);
499EXPORT_SYMBOL(utf8_mbstowcs);
500EXPORT_SYMBOL(utf8_wctomb);
501EXPORT_SYMBOL(utf8_wcstombs);
502