arm: mvebu: turris_omnia: move ATSHA204A from defconfig to Kconfig
[platform/kernel/u-boot.git] / lib / charset.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  charset conversion utils
4  *
5  *  Copyright (c) 2017 Rob Clark
6  */
7
8 #include <common.h>
9 #include <charset.h>
10 #include <capitalization.h>
11 #include <malloc.h>
12
13 static struct capitalization_table capitalization_table[] =
14 #ifdef CONFIG_EFI_UNICODE_CAPITALIZATION
15         UNICODE_CAPITALIZATION_TABLE;
16 #elif CONFIG_FAT_DEFAULT_CODEPAGE == 1250
17         CP1250_CAPITALIZATION_TABLE;
18 #else
19         CP437_CAPITALIZATION_TABLE;
20 #endif
21
22 /**
23  * get_code() - read Unicode code point from UTF-8 stream
24  *
25  * @read_u8:    - stream reader
26  * @src:        - string buffer passed to stream reader, optional
27  * Return:      - Unicode code point
28  */
29 static int get_code(u8 (*read_u8)(void *data), void *data)
30 {
31         s32 ch = 0;
32
33         ch = read_u8(data);
34         if (!ch)
35                 return 0;
36         if (ch >= 0xc2 && ch <= 0xf4) {
37                 int code = 0;
38
39                 if (ch >= 0xe0) {
40                         if (ch >= 0xf0) {
41                                 /* 0xf0 - 0xf4 */
42                                 ch &= 0x07;
43                                 code = ch << 18;
44                                 ch = read_u8(data);
45                                 if (ch < 0x80 || ch > 0xbf)
46                                         goto error;
47                                 ch &= 0x3f;
48                         } else {
49                                 /* 0xe0 - 0xef */
50                                 ch &= 0x0f;
51                         }
52                         code += ch << 12;
53                         if ((code >= 0xD800 && code <= 0xDFFF) ||
54                             code >= 0x110000)
55                                 goto error;
56                         ch = read_u8(data);
57                         if (ch < 0x80 || ch > 0xbf)
58                                 goto error;
59                 }
60                 /* 0xc0 - 0xdf or continuation byte (0x80 - 0xbf) */
61                 ch &= 0x3f;
62                 code += ch << 6;
63                 ch = read_u8(data);
64                 if (ch < 0x80 || ch > 0xbf)
65                         goto error;
66                 ch &= 0x3f;
67                 ch += code;
68         } else if (ch >= 0x80) {
69                 goto error;
70         }
71         return ch;
72 error:
73         return '?';
74 }
75
76 /**
77  * read_string() - read byte from character string
78  *
79  * @data:       - pointer to string
80  * Return:      - byte read
81  *
82  * The string pointer is incremented if it does not point to '\0'.
83  */
84 static u8 read_string(void *data)
85
86 {
87         const char **src = (const char **)data;
88         u8 c;
89
90         if (!src || !*src || !**src)
91                 return 0;
92         c = **src;
93         ++*src;
94         return c;
95 }
96
97 /**
98  * read_console() - read byte from console
99  *
100  * @data        - not used, needed to match interface
101  * Return:      - byte read or 0 on error
102  */
103 static u8 read_console(void *data)
104 {
105         int ch;
106
107         ch = getc();
108         if (ch < 0)
109                 ch = 0;
110         return ch;
111 }
112
113 int console_read_unicode(s32 *code)
114 {
115         if (!tstc()) {
116                 /* No input available */
117                 return 1;
118         }
119
120         /* Read Unicode code */
121         *code = get_code(read_console, NULL);
122         return 0;
123 }
124
125 s32 utf8_get(const char **src)
126 {
127         return get_code(read_string, src);
128 }
129
130 int utf8_put(s32 code, char **dst)
131 {
132         if (!dst || !*dst)
133                 return -1;
134         if ((code >= 0xD800 && code <= 0xDFFF) || code >= 0x110000)
135                 return -1;
136         if (code <= 0x007F) {
137                 **dst = code;
138         } else {
139                 if (code <= 0x07FF) {
140                         **dst = code >> 6 | 0xC0;
141                 } else {
142                         if (code < 0x10000) {
143                                 **dst = code >> 12 | 0xE0;
144                         } else {
145                                 **dst = code >> 18 | 0xF0;
146                                 ++*dst;
147                                 **dst = (code >> 12 & 0x3F) | 0x80;
148                         }
149                         ++*dst;
150                         **dst = (code >> 6 & 0x3F) | 0x80;
151                 }
152                 ++*dst;
153                 **dst = (code & 0x3F) | 0x80;
154         }
155         ++*dst;
156         return 0;
157 }
158
159 size_t utf8_utf16_strnlen(const char *src, size_t count)
160 {
161         size_t len = 0;
162
163         for (; *src && count; --count)  {
164                 s32 code = utf8_get(&src);
165
166                 if (!code)
167                         break;
168                 if (code < 0) {
169                         /* Reserve space for a replacement character */
170                         len += 1;
171                 } else if (code < 0x10000) {
172                         len += 1;
173                 } else {
174                         len += 2;
175                 }
176         }
177         return len;
178 }
179
180 int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count)
181 {
182         if (!src || !dst || !*dst)
183                 return -1;
184
185         for (; count && *src; --count) {
186                 s32 code = utf8_get(&src);
187
188                 if (code < 0)
189                         code = '?';
190                 utf16_put(code, dst);
191         }
192         **dst = 0;
193         return 0;
194 }
195
196 s32 utf16_get(const u16 **src)
197 {
198         s32 code, code2;
199
200         if (!src || !*src)
201                 return -1;
202         if (!**src)
203                 return 0;
204         code = **src;
205         ++*src;
206         if (code >= 0xDC00 && code <= 0xDFFF)
207                 return -1;
208         if (code >= 0xD800 && code <= 0xDBFF) {
209                 if (!**src)
210                         return -1;
211                 code &= 0x3ff;
212                 code <<= 10;
213                 code += 0x10000;
214                 code2 = **src;
215                 ++*src;
216                 if (code2 <= 0xDC00 || code2 >= 0xDFFF)
217                         return -1;
218                 code2 &= 0x3ff;
219                 code += code2;
220         }
221         return code;
222 }
223
224 int utf16_put(s32 code, u16 **dst)
225 {
226         if (!dst || !*dst)
227                 return -1;
228         if ((code >= 0xD800 && code <= 0xDFFF) || code >= 0x110000)
229                 return -1;
230         if (code < 0x10000) {
231                 **dst = code;
232         } else {
233                 code -= 0x10000;
234                 **dst = code >> 10 | 0xD800;
235                 ++*dst;
236                 **dst = (code & 0x3ff) | 0xDC00;
237         }
238         ++*dst;
239         return 0;
240 }
241
242 size_t utf16_strnlen(const u16 *src, size_t count)
243 {
244         size_t len = 0;
245
246         for (; *src && count; --count)  {
247                 s32 code = utf16_get(&src);
248
249                 if (!code)
250                         break;
251                 /*
252                  * In case of an illegal sequence still reserve space for a
253                  * replacement character.
254                  */
255                 ++len;
256         }
257         return len;
258 }
259
260 size_t utf16_utf8_strnlen(const u16 *src, size_t count)
261 {
262         size_t len = 0;
263
264         for (; *src && count; --count)  {
265                 s32 code = utf16_get(&src);
266
267                 if (!code)
268                         break;
269                 if (code < 0)
270                         /* Reserve space for a replacement character */
271                         len += 1;
272                 else if (code < 0x80)
273                         len += 1;
274                 else if (code < 0x800)
275                         len += 2;
276                 else if (code < 0x10000)
277                         len += 3;
278                 else
279                         len += 4;
280         }
281         return len;
282 }
283
284 int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count)
285 {
286         if (!src || !dst || !*dst)
287                 return -1;
288
289         for (; count && *src; --count) {
290                 s32 code = utf16_get(&src);
291
292                 if (code < 0)
293                         code = '?';
294                 utf8_put(code, dst);
295         }
296         **dst = 0;
297         return 0;
298 }
299
300 s32 utf_to_lower(const s32 code)
301 {
302         struct capitalization_table *pos = capitalization_table;
303         s32 ret = code;
304
305         if (code <= 0x7f) {
306                 if (code >= 'A' && code <= 'Z')
307                         ret += 0x20;
308                 return ret;
309         }
310         for (; pos->upper; ++pos) {
311                 if (pos->upper == code) {
312                         ret = pos->lower;
313                         break;
314                 }
315         }
316         return ret;
317 }
318
319 s32 utf_to_upper(const s32 code)
320 {
321         struct capitalization_table *pos = capitalization_table;
322         s32 ret = code;
323
324         if (code <= 0x7f) {
325                 if (code >= 'a' && code <= 'z')
326                         ret -= 0x20;
327                 return ret;
328         }
329         for (; pos->lower; ++pos) {
330                 if (pos->lower == code) {
331                         ret = pos->upper;
332                         break;
333                 }
334         }
335         return ret;
336 }
337
338 size_t u16_strlen(const u16 *in)
339 {
340         size_t i;
341         for (i = 0; in[i]; i++);
342         return i;
343 }
344
345 size_t u16_strnlen(const u16 *in, size_t count)
346 {
347         size_t i;
348         for (i = 0; count-- && in[i]; i++);
349         return i;
350 }
351
352 u16 *u16_strcpy(u16 *dest, const u16 *src)
353 {
354         u16 *tmp = dest;
355
356         for (;; dest++, src++) {
357                 *dest = *src;
358                 if (!*src)
359                         break;
360         }
361
362         return tmp;
363 }
364
365 u16 *u16_strdup(const u16 *src)
366 {
367         u16 *new;
368
369         if (!src)
370                 return NULL;
371
372         new = malloc((u16_strlen(src) + 1) * sizeof(u16));
373         if (!new)
374                 return NULL;
375
376         u16_strcpy(new, src);
377
378         return new;
379 }
380
381 /* Convert UTF-16 to UTF-8.  */
382 uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size)
383 {
384         uint32_t code_high = 0;
385
386         while (size--) {
387                 uint32_t code = *src++;
388
389                 if (code_high) {
390                         if (code >= 0xDC00 && code <= 0xDFFF) {
391                                 /* Surrogate pair.  */
392                                 code = ((code_high - 0xD800) << 10) + (code - 0xDC00) + 0x10000;
393
394                                 *dest++ = (code >> 18) | 0xF0;
395                                 *dest++ = ((code >> 12) & 0x3F) | 0x80;
396                                 *dest++ = ((code >> 6) & 0x3F) | 0x80;
397                                 *dest++ = (code & 0x3F) | 0x80;
398                         } else {
399                                 /* Error...  */
400                                 *dest++ = '?';
401                                 /* *src may be valid. Don't eat it.  */
402                                 src--;
403                         }
404
405                         code_high = 0;
406                 } else {
407                         if (code <= 0x007F) {
408                                 *dest++ = code;
409                         } else if (code <= 0x07FF) {
410                                 *dest++ = (code >> 6) | 0xC0;
411                                 *dest++ = (code & 0x3F) | 0x80;
412                         } else if (code >= 0xD800 && code <= 0xDBFF) {
413                                 code_high = code;
414                                 continue;
415                         } else if (code >= 0xDC00 && code <= 0xDFFF) {
416                                 /* Error... */
417                                 *dest++ = '?';
418                         } else if (code < 0x10000) {
419                                 *dest++ = (code >> 12) | 0xE0;
420                                 *dest++ = ((code >> 6) & 0x3F) | 0x80;
421                                 *dest++ = (code & 0x3F) | 0x80;
422                         } else {
423                                 *dest++ = (code >> 18) | 0xF0;
424                                 *dest++ = ((code >> 12) & 0x3F) | 0x80;
425                                 *dest++ = ((code >> 6) & 0x3F) | 0x80;
426                                 *dest++ = (code & 0x3F) | 0x80;
427                         }
428                 }
429         }
430
431         return dest;
432 }