mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
3.1 KiB
109 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef _LINUX_NLS_H |
|
#define _LINUX_NLS_H |
|
|
|
#include <linux/init.h> |
|
|
|
/* Unicode has changed over the years. Unicode code points no longer |
|
* fit into 16 bits; as of Unicode 5 valid code points range from 0 |
|
* to 0x10ffff (17 planes, where each plane holds 65536 code points). |
|
* |
|
* The original decision to represent Unicode characters as 16-bit |
|
* wchar_t values is now outdated. But plane 0 still includes the |
|
* most commonly used characters, so we will retain it. The newer |
|
* 32-bit unicode_t type can be used when it is necessary to |
|
* represent the full Unicode character set. |
|
*/ |
|
|
|
/* Plane-0 Unicode character */ |
|
typedef u16 wchar_t; |
|
#define MAX_WCHAR_T 0xffff |
|
|
|
/* Arbitrary Unicode character */ |
|
typedef u32 unicode_t; |
|
|
|
struct nls_table { |
|
const char *charset; |
|
const char *alias; |
|
int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen); |
|
int (*char2uni) (const unsigned char *rawstring, int boundlen, |
|
wchar_t *uni); |
|
const unsigned char *charset2lower; |
|
const unsigned char *charset2upper; |
|
struct module *owner; |
|
struct nls_table *next; |
|
}; |
|
|
|
/* this value hold the maximum octet of charset */ |
|
#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */ |
|
|
|
/* Byte order for UTF-16 strings */ |
|
enum utf16_endian { |
|
UTF16_HOST_ENDIAN, |
|
UTF16_LITTLE_ENDIAN, |
|
UTF16_BIG_ENDIAN |
|
}; |
|
|
|
/* nls_base.c */ |
|
extern int __register_nls(struct nls_table *, struct module *); |
|
extern int unregister_nls(struct nls_table *); |
|
extern struct nls_table *load_nls(char *); |
|
extern void unload_nls(struct nls_table *); |
|
extern struct nls_table *load_nls_default(void); |
|
#define register_nls(nls) __register_nls((nls), THIS_MODULE) |
|
|
|
extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu); |
|
extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen); |
|
extern int utf8s_to_utf16s(const u8 *s, int len, |
|
enum utf16_endian endian, wchar_t *pwcs, int maxlen); |
|
extern int utf16s_to_utf8s(const wchar_t *pwcs, int len, |
|
enum utf16_endian endian, u8 *s, int maxlen); |
|
|
|
static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c) |
|
{ |
|
unsigned char nc = t->charset2lower[c]; |
|
|
|
return nc ? nc : c; |
|
} |
|
|
|
static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c) |
|
{ |
|
unsigned char nc = t->charset2upper[c]; |
|
|
|
return nc ? nc : c; |
|
} |
|
|
|
static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1, |
|
const unsigned char *s2, int len) |
|
{ |
|
while (len--) { |
|
if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++)) |
|
return 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* nls_nullsize - return length of null character for codepage |
|
* @codepage - codepage for which to return length of NULL terminator |
|
* |
|
* Since we can't guarantee that the null terminator will be a particular |
|
* length, we have to check against the codepage. If there's a problem |
|
* determining it, assume a single-byte NULL terminator. |
|
*/ |
|
static inline int |
|
nls_nullsize(const struct nls_table *codepage) |
|
{ |
|
int charlen; |
|
char tmp[NLS_MAX_CHARSET_SIZE]; |
|
|
|
charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE); |
|
|
|
return charlen > 0 ? charlen : 1; |
|
} |
|
|
|
#define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name)) |
|
|
|
#endif /* _LINUX_NLS_H */ |
|
|
|
|