aboutsummaryrefslogtreecommitdiff
path: root/include/charset.h
blob: b93d0230923b83eca645188a6bdfe423bebfc179 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 *  charset conversion utils
 *
 *  Copyright (c) 2017 Rob Clark
 */

#ifndef __CHARSET_H_
#define __CHARSET_H_

#include <linux/kernel.h>
#include <linux/types.h>

#define MAX_UTF8_PER_UTF16 3

/*
 * codepage_437 - Unicode to codepage 437 translation table
 */
extern const u16 codepage_437[128];

/**
 * console_read_unicode() - read Unicode code point from console
 *
 * @code:	pointer to store Unicode code point
 * Return:	0 = success
 */
int console_read_unicode(s32 *code);

/**
 * utf8_get() - get next UTF-8 code point from buffer
 *
 * @src:		pointer to current byte, updated to point to next byte
 * Return:		code point, or 0 for end of string, or -1 if no legal
 *			code point is found. In case of an error src points to
 *			the incorrect byte.
 */
s32 utf8_get(const char **src);

/**
 * utf8_put() - write UTF-8 code point to buffer
 *
 * @code:		code point
 * @dst:		pointer to destination buffer, updated to next position
 * Return:		-1 if the input parameters are invalid
 */
int utf8_put(s32 code, char **dst);

/**
 * utf8_utf16_strnlen() - length of a truncated utf-8 string after conversion
 *			  to utf-16
 *
 * @src:		utf-8 string
 * @count:		maximum number of code points to convert
 * Return:		length in u16 after conversion to utf-16 without the
 *			trailing \0. If an invalid UTF-8 sequence is hit one
 *			u16 will be reserved for a replacement character.
 */
size_t utf8_utf16_strnlen(const char *src, size_t count);

/**
 * utf8_utf16_strlen() - length of a utf-8 string after conversion to utf-16
 *
 * @a:			utf-8 string
 * Return:		length in u16 after conversion to utf-16 without the
 *			trailing \0. If an invalid UTF-8 sequence is hit one
 *			u16 will be reserved for a replacement character.
 */
#define utf8_utf16_strlen(a) utf8_utf16_strnlen((a), SIZE_MAX)

/**
 * utf8_utf16_strncpy() - copy utf-8 string to utf-16 string
 *
 * @dst:		destination buffer
 * @src:		source buffer
 * @count:		maximum number of code points to copy
 * Return:		-1 if the input parameters are invalid
 */
int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count);

/**
 * utf8_utf16_strcpy() - copy utf-8 string to utf-16 string
 *
 * @d:			destination buffer
 * @s:			source buffer
 * Return:		-1 if the input parameters are invalid
 */
#define utf8_utf16_strcpy(d, s) utf8_utf16_strncpy((d), (s), SIZE_MAX)

/**
 * utf16_get() - get next UTF-16 code point from buffer
 *
 * @src:		pointer to current word, updated to point to next word
 * Return:		code point, or 0 for end of string, or -1 if no legal
 *			code point is found. In case of an error src points to
 *			the incorrect word.
 */
s32 utf16_get(const u16 **src);

/**
 * utf16_put() - write UTF-16 code point to buffer
 *
 * @code:		code point
 * @dst:		pointer to destination buffer, updated to next position
 * Return:		-1 if the input parameters are invalid
 */
int utf16_put(s32 code, u16 **dst);

/**
 * utf16_strnlen() - length of a truncated utf-16 string
 *
 * @src:		utf-16 string
 * @count:		maximum number of code points to convert
 * Return:		length in code points. If an invalid UTF-16 sequence is
 *			hit one position will be reserved for a replacement
 *			character.
 */
size_t utf16_strnlen(const u16 *src, size_t count);

/**
 * utf16_utf8_strnlen() - length of a truncated utf-16 string after conversion
 *			  to utf-8
 *
 * @src:		utf-16 string
 * @count:		maximum number of code points to convert
 * Return:		length in bytes after conversion to utf-8 without the
 *			trailing \0. If an invalid UTF-16 sequence is hit one
 *			byte will be reserved for a replacement character.
 */
size_t utf16_utf8_strnlen(const u16 *src, size_t count);

/**
 * utf16_utf8_strlen() - length of a utf-16 string after conversion to utf-8
 *
 * @a:			utf-16 string
 * Return:		length in bytes after conversion to utf-8 without the
 *			trailing \0. If an invalid UTF-16 sequence is hit one
 *			byte will be reserved for a replacement character.
 */
#define utf16_utf8_strlen(a) utf16_utf8_strnlen((a), SIZE_MAX)

/**
 * utf16_utf8_strncpy() - copy utf-16 string to utf-8 string
 *
 * @dst:		destination buffer
 * @src:		source buffer
 * @count:		maximum number of code points to copy
 * Return:		-1 if the input parameters are invalid
 */
int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count);

/**
 * utf16_utf8_strcpy() - copy utf-16 string to utf-8 string
 *
 * @d:			destination buffer
 * @s:			source buffer
 * Return:		-1 if the input parameters are invalid
 */
#define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX)

/**
 * utf_to_lower() - convert a Unicode letter to lower case
 *
 * @code:		letter to convert
 * Return:		lower case letter or unchanged letter
 */
s32 utf_to_lower(const s32 code);

/**
 * utf_to_upper() - convert a Unicode letter to upper case
 *
 * @code:		letter to convert
 * Return:		upper case letter or unchanged letter
 */
s32 utf_to_upper(const s32 code);

/**
 * u16_strncmp() - compare two u16 string
 *
 * @s1:		first string to compare
 * @s2:		second string to compare
 * @n:		maximum number of u16 to compare
 * Return:	0  if the first n u16 are the same in s1 and s2
 *		< 0 if the first different u16 in s1 is less than the
 *		corresponding u16 in s2
 *		> 0 if the first different u16 in s1 is greater than the
 *		corresponding u16 in s2
 */
int u16_strncmp(const u16 *s1, const u16 *s2, size_t n);

/**
 * u16_strcmp() - compare two u16 string
 *
 * @s1:		first string to compare
 * @s2:		second string to compare
 * Return:	0  if the first n u16 are the same in s1 and s2
 *		< 0 if the first different u16 in s1 is less than the
 *		corresponding u16 in s2
 *		> 0 if the first different u16 in s1 is greater than the
 *		corresponding u16 in s2
 */
#define u16_strcmp(s1, s2)	u16_strncmp((s1), (s2), SIZE_MAX)

/**
 * u16_strlen - count non-zero words
 *
 * This function matches wsclen() if the -fshort-wchar compiler flag is set.
 * In the EFI context we explicitly need a function handling u16 strings.
 *
 * @in:			null terminated u16 string
 * Return:		number of non-zero words.
 *			This is not the number of utf-16 letters!
 */
size_t u16_strlen(const void *in);

/**
 * u16_strsize() - count size of u16 string in bytes including the null
 *		   character
 *
 * Counts the number of bytes occupied by a u16 string
 *
 * @in:			null terminated u16 string
 * Return:		bytes in a u16 string
 */
size_t u16_strsize(const void *in);

/**
 * u16_strnlen() - count non-zero words
 *
 * This function matches wscnlen_s() if the -fshort-wchar compiler flag is set.
 * In the EFI context we explicitly need a function handling u16 strings.
 *
 * @in:			null terminated u16 string
 * @count:		maximum number of words to count
 * Return:		number of non-zero words.
 *			This is not the number of utf-16 letters!
 */
size_t u16_strnlen(const u16 *in, size_t count);

/**
 * u16_strcpy() - copy u16 string
 *
 * Copy u16 string pointed to by src, including terminating null word, to
 * the buffer pointed to by dest.
 *
 * @dest:		destination buffer
 * @src:		source buffer (null terminated)
 * Return:		'dest' address
 */
u16 *u16_strcpy(u16 *dest, const u16 *src);

/**
 * u16_strdup() - duplicate u16 string
 *
 * Copy u16 string pointed to by src, including terminating null word, to a
 * newly allocated buffer.
 *
 * @src:		source buffer (null terminated)
 * Return:		allocated new buffer on success, NULL on failure
 */
u16 *u16_strdup(const void *src);

/**
 * utf16_to_utf8() - Convert an utf16 string to utf8
 *
 * Converts 'size' characters of the utf16 string 'src' to utf8
 * written to the 'dest' buffer.
 *
 * NOTE that a single utf16 character can generate up to 3 utf8
 * characters.  See MAX_UTF8_PER_UTF16.
 *
 * @dest:	the destination buffer to write the utf8 characters
 * @src:	the source utf16 string
 * @size:	the number of utf16 characters to convert
 * Return:	the pointer to the first unwritten byte in 'dest'
 */
uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);

/**
 * utf_to_cp() - translate Unicode code point to 8bit codepage
 *
 * Codepoints that do not exist in the codepage are rendered as question mark.
 *
 * @c:		pointer to Unicode code point to be translated
 * @codepage:	Unicode to codepage translation table
 * Return:	0 on success, -ENOENT if codepoint cannot be translated
 */
int utf_to_cp(s32 *c, const u16 *codepage);

/**
 * utf8_to_cp437_stream() - convert UTF-8 stream to codepage 437
 *
 * @c:		next UTF-8 character to convert
 * @buffer:	buffer, at least 5 characters
 * Return:	next codepage 437 character or 0
 */
int utf8_to_cp437_stream(u8 c, char *buffer);

/**
 * utf8_to_utf32_stream() - convert UTF-8 stream to UTF-32
 *
 * @c:		next UTF-8 character to convert
 * @buffer:	buffer, at least 5 characters
 * Return:	next codepage 437 character or 0
 */
int utf8_to_utf32_stream(u8 c, char *buffer);

#endif /* __CHARSET_H_ */