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|
/*
* linux/fs/nls.c
*
* Native language support--charsets and unicode translations.
* By Gordon Chaffee 1996, 1997
*
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/config.h>
#include <linux/nls.h>
#include <linux/malloc.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#include <asm/byteorder.h>
static struct nls_table *tables = (struct nls_table *) NULL;
/*
* Sample implementation from Unicode home page.
* http://www.stonehand.com/unicode/standard/fss-utf.html
*/
struct utf8_table {
int cmask;
int cval;
int shift;
long lmask;
long lval;
};
static struct utf8_table utf8_table[] =
{
{0x80, 0x00, 0*6, 0x7F, 0, /* 1 byte sequence */},
{0xE0, 0xC0, 1*6, 0x7FF, 0x80, /* 2 byte sequence */},
{0xF0, 0xE0, 2*6, 0xFFFF, 0x800, /* 3 byte sequence */},
{0xF8, 0xF0, 3*6, 0x1FFFFF, 0x10000, /* 4 byte sequence */},
{0xFC, 0xF8, 4*6, 0x3FFFFFF, 0x200000, /* 5 byte sequence */},
{0xFE, 0xFC, 5*6, 0x7FFFFFFF, 0x4000000, /* 6 byte sequence */},
{0, /* end of table */}
};
int
utf8_mbtowc(__u16 *p, const __u8 *s, int n)
{
long l;
int c0, c, nc;
struct utf8_table *t;
printk("utf8_mbtowc\n");
nc = 0;
c0 = *s;
l = c0;
for (t = utf8_table; t->cmask; t++) {
nc++;
if ((c0 & t->cmask) == t->cval) {
l &= t->lmask;
if (l < t->lval)
return -1;
*p = l;
return nc;
}
if (n <= nc)
return -1;
s++;
c = (*s ^ 0x80) & 0xFF;
if (c & 0xC0)
return -1;
l = (l << 6) | c;
}
return -1;
}
int
utf8_mbstowcs(__u16 *pwcs, const __u8 *s, int n)
{
__u16 *op;
const __u8 *ip;
int size;
printk("\nutf8_mbstowcs: n=%d\n", n);
op = pwcs;
ip = s;
while (*ip && n > 0) {
printk(" %02x", *ip);
if (*ip & 0x80) {
size = utf8_mbtowc(op, ip, n);
if (size == -1) {
/* Ignore character and move on */
ip++;
n--;
} else {
op += size;
ip += size;
n -= size;
}
} else {
*op++ = *ip++;
}
}
return (op - pwcs);
}
int
utf8_wctomb(__u8 *s, __u16 wc, int maxlen)
{
long l;
int c, nc;
struct utf8_table *t;
if (s == 0)
return 0;
l = wc;
nc = 0;
for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
nc++;
if (l <= t->lmask) {
c = t->shift;
*s = t->cval | (l >> c);
while (c > 0) {
c -= 6;
s++;
*s = 0x80 | ((l >> c) & 0x3F);
}
return nc;
}
}
return -1;
}
int
utf8_wcstombs(__u8 *s, const __u16 *pwcs, int maxlen)
{
const __u16 *ip;
__u8 *op;
int size;
op = s;
ip = pwcs;
while (*ip && maxlen > 0) {
if (*ip > 0x7f) {
size = utf8_wctomb(op, *ip, maxlen);
if (size == -1) {
/* Ignore character and move on */
maxlen--;
} else {
op += size;
maxlen -= size;
}
} else {
*op++ = (__u8) *ip;
}
ip++;
}
return (op - s);
}
int register_nls(struct nls_table * nls)
{
struct nls_table ** tmp = &tables;
if (!nls)
return -EINVAL;
if (nls->next)
return -EBUSY;
while (*tmp) {
if (nls == *tmp) {
return -EBUSY;
}
tmp = &(*tmp)->next;
}
nls->next = tables;
tables = nls;
return 0;
}
int unregister_nls(struct nls_table * nls)
{
struct nls_table ** tmp = &tables;
while (*tmp) {
if (nls == *tmp) {
*tmp = nls->next;
return 0;
}
tmp = &(*tmp)->next;
}
return -EINVAL;
}
struct nls_table *find_nls(char *charset)
{
struct nls_table *nls = tables;
while (nls) {
if (! strcmp(nls->charset, charset))
return nls;
nls = nls->next;
}
return NULL;
}
struct nls_table *load_nls(char *charset)
{
struct nls_table *nls;
#ifdef CONFIG_KMOD
char buf[40];
int ret;
#endif
nls = find_nls(charset);
if (nls) {
nls->inc_use_count();
return nls;
}
#ifndef CONFIG_KMOD
return NULL;
#else
if (strlen(charset) > sizeof(buf) - sizeof("nls_")) {
printk("Unable to load NLS charset %s: name too long\n", charset);
return NULL;
}
sprintf(buf, "nls_%s", charset);
ret = request_module(buf);
if (ret != 0) {
printk("Unable to load NLS charset %s\n", charset);
return NULL;
}
nls = find_nls(charset);
if (nls) {
nls->inc_use_count();
}
return nls;
#endif
}
void unload_nls(struct nls_table *nls)
{
nls->dec_use_count();
}
struct nls_unicode charset2uni[256] = {
/* 0x00*/
{0x00, 0x00}, {0x01, 0x00}, {0x02, 0x00}, {0x03, 0x00},
{0x04, 0x00}, {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x00},
{0x08, 0x00}, {0x09, 0x00}, {0x0a, 0x00}, {0x0b, 0x00},
{0x0c, 0x00}, {0x0d, 0x00}, {0x0e, 0x00}, {0x0f, 0x00},
/* 0x10*/
{0x10, 0x00}, {0x11, 0x00}, {0x12, 0x00}, {0x13, 0x00},
{0x14, 0x00}, {0x15, 0x00}, {0x16, 0x00}, {0x17, 0x00},
{0x18, 0x00}, {0x19, 0x00}, {0x1a, 0x00}, {0x1b, 0x00},
{0x1c, 0x00}, {0x1d, 0x00}, {0x1e, 0x00}, {0x1f, 0x00},
/* 0x20*/
{0x20, 0x00}, {0x21, 0x00}, {0x22, 0x00}, {0x23, 0x00},
{0x24, 0x00}, {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00},
{0x28, 0x00}, {0x29, 0x00}, {0x2a, 0x00}, {0x2b, 0x00},
{0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x2f, 0x00},
/* 0x30*/
{0x30, 0x00}, {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00},
{0x34, 0x00}, {0x35, 0x00}, {0x36, 0x00}, {0x37, 0x00},
{0x38, 0x00}, {0x39, 0x00}, {0x3a, 0x00}, {0x3b, 0x00},
{0x3c, 0x00}, {0x3d, 0x00}, {0x3e, 0x00}, {0x3f, 0x00},
/* 0x40*/
{0x40, 0x00}, {0x41, 0x00}, {0x42, 0x00}, {0x43, 0x00},
{0x44, 0x00}, {0x45, 0x00}, {0x46, 0x00}, {0x47, 0x00},
{0x48, 0x00}, {0x49, 0x00}, {0x4a, 0x00}, {0x4b, 0x00},
{0x4c, 0x00}, {0x4d, 0x00}, {0x4e, 0x00}, {0x4f, 0x00},
/* 0x50*/
{0x50, 0x00}, {0x51, 0x00}, {0x52, 0x00}, {0x53, 0x00},
{0x54, 0x00}, {0x55, 0x00}, {0x56, 0x00}, {0x57, 0x00},
{0x58, 0x00}, {0x59, 0x00}, {0x5a, 0x00}, {0x5b, 0x00},
{0x5c, 0x00}, {0x5d, 0x00}, {0x5e, 0x00}, {0x5f, 0x00},
/* 0x60*/
{0x60, 0x00}, {0x61, 0x00}, {0x62, 0x00}, {0x63, 0x00},
{0x64, 0x00}, {0x65, 0x00}, {0x66, 0x00}, {0x67, 0x00},
{0x68, 0x00}, {0x69, 0x00}, {0x6a, 0x00}, {0x6b, 0x00},
{0x6c, 0x00}, {0x6d, 0x00}, {0x6e, 0x00}, {0x6f, 0x00},
/* 0x70*/
{0x70, 0x00}, {0x71, 0x00}, {0x72, 0x00}, {0x73, 0x00},
{0x74, 0x00}, {0x75, 0x00}, {0x76, 0x00}, {0x77, 0x00},
{0x78, 0x00}, {0x79, 0x00}, {0x7a, 0x00}, {0x7b, 0x00},
{0x7c, 0x00}, {0x7d, 0x00}, {0x7e, 0x00}, {0x7f, 0x00},
/* 0x80*/
{0x80, 0x00}, {0x81, 0x00}, {0x82, 0x00}, {0x83, 0x00},
{0x84, 0x00}, {0x85, 0x00}, {0x86, 0x00}, {0x87, 0x00},
{0x88, 0x00}, {0x89, 0x00}, {0x8a, 0x00}, {0x8b, 0x00},
{0x8c, 0x00}, {0x8d, 0x00}, {0x8e, 0x00}, {0x8f, 0x00},
/* 0x90*/
{0x90, 0x00}, {0x91, 0x00}, {0x92, 0x00}, {0x93, 0x00},
{0x94, 0x00}, {0x95, 0x00}, {0x96, 0x00}, {0x97, 0x00},
{0x98, 0x00}, {0x99, 0x00}, {0x9a, 0x00}, {0x9b, 0x00},
{0x9c, 0x00}, {0x9d, 0x00}, {0x9e, 0x00}, {0x9f, 0x00},
/* 0xa0*/
{0xa0, 0x00}, {0xa1, 0x00}, {0xa2, 0x00}, {0xa3, 0x00},
{0xa4, 0x00}, {0xa5, 0x00}, {0xa6, 0x00}, {0xa7, 0x00},
{0xa8, 0x00}, {0xa9, 0x00}, {0xaa, 0x00}, {0xab, 0x00},
{0xac, 0x00}, {0xad, 0x00}, {0xae, 0x00}, {0xaf, 0x00},
/* 0xb0*/
{0xb0, 0x00}, {0xb1, 0x00}, {0xb2, 0x00}, {0xb3, 0x00},
{0xb4, 0x00}, {0xb5, 0x00}, {0xb6, 0x00}, {0xb7, 0x00},
{0xb8, 0x00}, {0xb9, 0x00}, {0xba, 0x00}, {0xbb, 0x00},
{0xbc, 0x00}, {0xbd, 0x00}, {0xbe, 0x00}, {0xbf, 0x00},
/* 0xc0*/
{0xc0, 0x00}, {0xc1, 0x00}, {0xc2, 0x00}, {0xc3, 0x00},
{0xc4, 0x00}, {0xc5, 0x00}, {0xc6, 0x00}, {0xc7, 0x00},
{0xc8, 0x00}, {0xc9, 0x00}, {0xca, 0x00}, {0xcb, 0x00},
{0xcc, 0x00}, {0xcd, 0x00}, {0xce, 0x00}, {0xcf, 0x00},
/* 0xd0*/
{0xd0, 0x00}, {0xd1, 0x00}, {0xd2, 0x00}, {0xd3, 0x00},
{0xd4, 0x00}, {0xd5, 0x00}, {0xd6, 0x00}, {0xd7, 0x00},
{0xd8, 0x00}, {0xd9, 0x00}, {0xda, 0x00}, {0xdb, 0x00},
{0xdc, 0x00}, {0xdd, 0x00}, {0xde, 0x00}, {0xdf, 0x00},
/* 0xe0*/
{0xe0, 0x00}, {0xe1, 0x00}, {0xe2, 0x00}, {0xe3, 0x00},
{0xe4, 0x00}, {0xe5, 0x00}, {0xe6, 0x00}, {0xe7, 0x00},
{0xe8, 0x00}, {0xe9, 0x00}, {0xea, 0x00}, {0xeb, 0x00},
{0xec, 0x00}, {0xed, 0x00}, {0xee, 0x00}, {0xef, 0x00},
/* 0xf0*/
{0xf0, 0x00}, {0xf1, 0x00}, {0xf2, 0x00}, {0xf3, 0x00},
{0xf4, 0x00}, {0xf5, 0x00}, {0xf6, 0x00}, {0xf7, 0x00},
{0xf8, 0x00}, {0xf9, 0x00}, {0xfa, 0x00}, {0xfb, 0x00},
{0xfc, 0x00}, {0xfd, 0x00}, {0xfe, 0x00}, {0xff, 0x00},
};
static unsigned char page00[256] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};
static unsigned char *page_uni2charset[256] = {
page00
};
void inc_use_count(void)
{
}
void dec_use_count(void)
{
}
static struct nls_table default_table = {
"default",
page_uni2charset,
charset2uni,
inc_use_count,
dec_use_count,
NULL
};
/* Returns a simple default translation table */
struct nls_table *load_nls_default(void)
{
return &default_table;
}
EXPORT_SYMBOL(register_nls);
EXPORT_SYMBOL(unregister_nls);
EXPORT_SYMBOL(unload_nls);
EXPORT_SYMBOL(find_nls);
EXPORT_SYMBOL(load_nls);
EXPORT_SYMBOL(load_nls_default);
EXPORT_SYMBOL(utf8_mbtowc);
EXPORT_SYMBOL(utf8_mbstowcs);
EXPORT_SYMBOL(utf8_wctomb);
EXPORT_SYMBOL(utf8_wcstombs);
int init_nls(void)
{
#ifdef CONFIG_NLS_ISO8859_1
init_nls_iso8859_1();
#endif
#ifdef CONFIG_NLS_ISO8859_2
init_nls_iso8859_2();
#endif
#ifdef CONFIG_NLS_ISO8859_3
init_nls_iso8859_3();
#endif
#ifdef CONFIG_NLS_ISO8859_4
init_nls_iso8859_4();
#endif
#ifdef CONFIG_NLS_ISO8859_5
init_nls_iso8859_5();
#endif
#ifdef CONFIG_NLS_ISO8859_6
init_nls_iso8859_6();
#endif
#ifdef CONFIG_NLS_ISO8859_7
init_nls_iso8859_7();
#endif
#ifdef CONFIG_NLS_ISO8859_8
init_nls_iso8859_8();
#endif
#ifdef CONFIG_NLS_ISO8859_9
init_nls_iso8859_9();
#endif
#ifdef CONFIG_NLS_CODEPAGE_437
init_nls_cp437();
#endif
#ifdef CONFIG_NLS_CODEPAGE_737
init_nls_cp737();
#endif
#ifdef CONFIG_NLS_CODEPAGE_775
init_nls_cp775();
#endif
#ifdef CONFIG_NLS_CODEPAGE_850
init_nls_cp850();
#endif
#ifdef CONFIG_NLS_CODEPAGE_852
init_nls_cp852();
#endif
#ifdef CONFIG_NLS_CODEPAGE_855
init_nls_cp855();
#endif
#ifdef CONFIG_NLS_CODEPAGE_857
init_nls_cp857();
#endif
#ifdef CONFIG_NLS_CODEPAGE_860
init_nls_cp860();
#endif
#ifdef CONFIG_NLS_CODEPAGE_861
init_nls_cp861();
#endif
#ifdef CONFIG_NLS_CODEPAGE_862
init_nls_cp862();
#endif
#ifdef CONFIG_NLS_CODEPAGE_863
init_nls_cp863();
#endif
#ifdef CONFIG_NLS_CODEPAGE_864
init_nls_cp864();
#endif
#ifdef CONFIG_NLS_CODEPAGE_865
init_nls_cp865();
#endif
#ifdef CONFIG_NLS_CODEPAGE_866
init_nls_cp866();
#endif
#ifdef CONFIG_NLS_CODEPAGE_869
init_nls_cp869();
#endif
#ifdef CONFIG_NLS_CODEPAGE_874
init_nls_cp874();
#endif
#ifdef CONFIG_NLS_KOI8_R
init_nls_koi8_r();
#endif
return 0;
}
#ifdef MODULE
int init_module(void)
{
return init_nls();
}
void cleanup_module(void)
{
}
#endif /* ifdef MODULE */
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