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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
036ae95a | 6 | Copyright 2008-2011 Kay Sievers |
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7 | Copyright 2012 Lennart Poettering |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
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10 | under the terms of the GNU Lesser General Public License as published by |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
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12 | (at your option) any later version. |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 17 | Lesser General Public License for more details. |
7f110ff9 | 18 | |
5430f7f2 | 19 | You should have received a copy of the GNU Lesser General Public License |
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20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
21 | ***/ | |
22 | ||
036ae95a | 23 | /* Parts of this file are based on the GLIB utf8 validation functions. The |
7f110ff9 LP |
24 | * original license text follows. */ |
25 | ||
26 | /* gutf8.c - Operations on UTF-8 strings. | |
27 | * | |
28 | * Copyright (C) 1999 Tom Tromey | |
29 | * Copyright (C) 2000 Red Hat, Inc. | |
30 | * | |
31 | * This library is free software; you can redistribute it and/or | |
23757887 | 32 | * modify it under the terms of the GNU Library General Public |
7f110ff9 LP |
33 | * License as published by the Free Software Foundation; either |
34 | * version 2 of the License, or (at your option) any later version. | |
35 | * | |
36 | * This library is distributed in the hope that it will be useful, | |
37 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23757887 SK |
38 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
39 | * Library General Public License for more details. | |
7f110ff9 | 40 | * |
23757887 SK |
41 | * You should have received a copy of the GNU Library General Public |
42 | * License along with this library; if not, write to the Free Software | |
43 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
7f110ff9 LP |
44 | */ |
45 | ||
46 | #include <errno.h> | |
47 | #include <stdlib.h> | |
48 | #include <inttypes.h> | |
49 | #include <string.h> | |
50 | #include <stdbool.h> | |
51 | ||
52 | #include "utf8.h" | |
2e3d0692 | 53 | #include "util.h" |
7f110ff9 | 54 | |
7f110ff9 LP |
55 | static inline bool is_unicode_valid(uint32_t ch) { |
56 | ||
57 | if (ch >= 0x110000) /* End of unicode space */ | |
58 | return false; | |
59 | if ((ch & 0xFFFFF800) == 0xD800) /* Reserved area for UTF-16 */ | |
60 | return false; | |
61 | if ((ch >= 0xFDD0) && (ch <= 0xFDEF)) /* Reserved */ | |
62 | return false; | |
63 | if ((ch & 0xFFFE) == 0xFFFE) /* BOM (Byte Order Mark) */ | |
64 | return false; | |
65 | ||
66 | return true; | |
67 | } | |
68 | ||
ba961854 ZJS |
69 | static bool is_unicode_control(uint32_t ch) { |
70 | ||
71 | /* | |
72 | 0 to ' '-1 is the C0 range. | |
73 | DEL=0x7F, and DEL+1 to 0x9F is C1 range. | |
74 | '\t' is in C0 range, but more or less harmless and commonly used. | |
75 | */ | |
76 | ||
31f7bf19 | 77 | return (ch < ' ' && ch != '\t' && ch != '\n') || |
ba961854 ZJS |
78 | (0x7F <= ch && ch <= 0x9F); |
79 | } | |
80 | ||
7991ac34 DR |
81 | /* count of characters used to encode one unicode char */ |
82 | static int utf8_encoded_expected_len(const char *str) { | |
7e8185ef | 83 | unsigned char c; |
ba961854 | 84 | |
7e8185ef LP |
85 | assert(str); |
86 | ||
87 | c = (unsigned char) str[0]; | |
7991ac34 DR |
88 | if (c < 0x80) |
89 | return 1; | |
90 | if ((c & 0xe0) == 0xc0) | |
91 | return 2; | |
92 | if ((c & 0xf0) == 0xe0) | |
93 | return 3; | |
94 | if ((c & 0xf8) == 0xf0) | |
95 | return 4; | |
96 | if ((c & 0xfc) == 0xf8) | |
97 | return 5; | |
98 | if ((c & 0xfe) == 0xfc) | |
99 | return 6; | |
7e8185ef | 100 | |
7991ac34 DR |
101 | return 0; |
102 | } | |
ba961854 | 103 | |
7991ac34 | 104 | /* decode one unicode char */ |
f405e86d | 105 | int utf8_encoded_to_unichar(const char *str) { |
7e8185ef LP |
106 | int unichar, len, i; |
107 | ||
108 | assert(str); | |
ba961854 | 109 | |
7991ac34 | 110 | len = utf8_encoded_expected_len(str); |
7e8185ef | 111 | |
7991ac34 DR |
112 | switch (len) { |
113 | case 1: | |
114 | return (int)str[0]; | |
115 | case 2: | |
116 | unichar = str[0] & 0x1f; | |
117 | break; | |
118 | case 3: | |
119 | unichar = (int)str[0] & 0x0f; | |
120 | break; | |
121 | case 4: | |
122 | unichar = (int)str[0] & 0x07; | |
123 | break; | |
124 | case 5: | |
125 | unichar = (int)str[0] & 0x03; | |
126 | break; | |
127 | case 6: | |
128 | unichar = (int)str[0] & 0x01; | |
129 | break; | |
130 | default: | |
7e8185ef | 131 | return -EINVAL; |
ba961854 ZJS |
132 | } |
133 | ||
7991ac34 DR |
134 | for (i = 1; i < len; i++) { |
135 | if (((int)str[i] & 0xc0) != 0x80) | |
7e8185ef | 136 | return -EINVAL; |
7991ac34 DR |
137 | unichar <<= 6; |
138 | unichar |= (int)str[i] & 0x3f; | |
139 | } | |
140 | ||
141 | return unichar; | |
ba961854 ZJS |
142 | } |
143 | ||
0ade5ffe | 144 | bool utf8_is_printable_newline(const char* str, size_t length, bool newline) { |
7991ac34 | 145 | const uint8_t *p; |
7f110ff9 LP |
146 | |
147 | assert(str); | |
148 | ||
a7176505 | 149 | for (p = (const uint8_t*) str; length;) { |
7e8185ef LP |
150 | int encoded_len, val; |
151 | ||
152 | encoded_len = utf8_encoded_valid_unichar((const char *) p); | |
7e8185ef | 153 | if (encoded_len < 0 || |
144b3d9e LP |
154 | (size_t) encoded_len > length) |
155 | return false; | |
156 | ||
157 | val = utf8_encoded_to_unichar((const char*) p); | |
158 | if (val < 0 || | |
7e8185ef | 159 | is_unicode_control(val) || |
0ade5ffe | 160 | (!newline && val == '\n')) |
7991ac34 | 161 | return false; |
7f110ff9 | 162 | |
7991ac34 | 163 | length -= encoded_len; |
a7176505 | 164 | p += encoded_len; |
7f110ff9 LP |
165 | } |
166 | ||
7991ac34 | 167 | return true; |
7f110ff9 LP |
168 | } |
169 | ||
7991ac34 DR |
170 | const char *utf8_is_valid(const char *str) { |
171 | const uint8_t *p; | |
7f110ff9 LP |
172 | |
173 | assert(str); | |
174 | ||
7991ac34 | 175 | for (p = (const uint8_t*) str; *p; ) { |
faaa5728 LP |
176 | int len; |
177 | ||
178 | len = utf8_encoded_valid_unichar((const char *)p); | |
7991ac34 DR |
179 | if (len < 0) |
180 | return NULL; | |
181 | ||
182 | p += len; | |
183 | } | |
7f110ff9 | 184 | |
7991ac34 | 185 | return str; |
7f110ff9 LP |
186 | } |
187 | ||
550a40ec ZJS |
188 | char *utf8_escape_invalid(const char *str) { |
189 | char *p, *s; | |
190 | ||
191 | assert(str); | |
192 | ||
193 | p = s = malloc(strlen(str) * 4 + 1); | |
194 | if (!p) | |
195 | return NULL; | |
196 | ||
197 | while (*str) { | |
198 | int len; | |
199 | ||
200 | len = utf8_encoded_valid_unichar(str); | |
201 | if (len > 0) { | |
202 | s = mempcpy(s, str, len); | |
203 | str += len; | |
204 | } else { | |
3c6d3052 | 205 | s = stpcpy(s, UTF8_REPLACEMENT_CHARACTER); |
550a40ec ZJS |
206 | str += 1; |
207 | } | |
208 | } | |
7e8185ef | 209 | |
550a40ec ZJS |
210 | *s = '\0'; |
211 | ||
212 | return p; | |
213 | } | |
214 | ||
fec84576 WC |
215 | char *utf8_escape_non_printable(const char *str) { |
216 | char *p, *s; | |
217 | ||
218 | assert(str); | |
219 | ||
220 | p = s = malloc(strlen(str) * 4 + 1); | |
221 | if (!p) | |
222 | return NULL; | |
223 | ||
224 | while (*str) { | |
225 | int len; | |
226 | ||
227 | len = utf8_encoded_valid_unichar(str); | |
228 | if (len > 0) { | |
229 | if (utf8_is_printable(str, len)) { | |
230 | s = mempcpy(s, str, len); | |
231 | str += len; | |
232 | } else { | |
3c6d3052 | 233 | while (len > 0) { |
fec84576 WC |
234 | *(s++) = '\\'; |
235 | *(s++) = 'x'; | |
236 | *(s++) = hexchar((int) *str >> 4); | |
237 | *(s++) = hexchar((int) *str); | |
fec84576 | 238 | |
3c6d3052 LP |
239 | str += 1; |
240 | len --; | |
241 | } | |
fec84576 WC |
242 | } |
243 | } else { | |
3c6d3052 | 244 | s = stpcpy(s, UTF8_REPLACEMENT_CHARACTER); |
fec84576 WC |
245 | str += 1; |
246 | } | |
247 | } | |
248 | ||
249 | *s = '\0'; | |
250 | ||
251 | return p; | |
252 | } | |
253 | ||
7f110ff9 LP |
254 | char *ascii_is_valid(const char *str) { |
255 | const char *p; | |
256 | ||
257 | assert(str); | |
258 | ||
259 | for (p = str; *p; p++) | |
260 | if ((unsigned char) *p >= 128) | |
261 | return NULL; | |
262 | ||
263 | return (char*) str; | |
264 | } | |
265 | ||
2e3d0692 LP |
266 | char *utf16_to_utf8(const void *s, size_t length) { |
267 | char *r; | |
268 | const uint8_t *f; | |
269 | uint8_t *t; | |
270 | ||
271 | r = new(char, (length*3+1)/2 + 1); | |
272 | if (!r) | |
273 | return NULL; | |
274 | ||
275 | t = (uint8_t*) r; | |
276 | ||
277 | for (f = s; f < (const uint8_t*) s + length; f += 2) { | |
278 | uint16_t c; | |
279 | ||
280 | c = (f[1] << 8) | f[0]; | |
281 | ||
282 | if (c == 0) { | |
283 | *t = 0; | |
284 | return r; | |
285 | } else if (c < 0x80) { | |
286 | *(t++) = (uint8_t) c; | |
287 | } else if (c < 0x800) { | |
288 | *(t++) = (uint8_t) (0xc0 | (c >> 6)); | |
289 | *(t++) = (uint8_t) (0x80 | (c & 0x3f)); | |
290 | } else { | |
291 | *(t++) = (uint8_t) (0xe0 | (c >> 12)); | |
292 | *(t++) = (uint8_t) (0x80 | ((c >> 6) & 0x3f)); | |
293 | *(t++) = (uint8_t) (0x80 | (c & 0x3f)); | |
294 | } | |
295 | } | |
296 | ||
297 | *t = 0; | |
2e3d0692 | 298 | |
7b4d7cc0 | 299 | return r; |
2e3d0692 | 300 | } |
02a36bc9 | 301 | |
02a36bc9 DR |
302 | /* expected size used to encode one unicode char */ |
303 | static int utf8_unichar_to_encoded_len(int unichar) { | |
7e8185ef | 304 | |
02a36bc9 DR |
305 | if (unichar < 0x80) |
306 | return 1; | |
307 | if (unichar < 0x800) | |
308 | return 2; | |
309 | if (unichar < 0x10000) | |
310 | return 3; | |
311 | if (unichar < 0x200000) | |
312 | return 4; | |
313 | if (unichar < 0x4000000) | |
314 | return 5; | |
7e8185ef | 315 | |
02a36bc9 DR |
316 | return 6; |
317 | } | |
318 | ||
319 | /* validate one encoded unicode char and return its length */ | |
320 | int utf8_encoded_valid_unichar(const char *str) { | |
7e8185ef LP |
321 | int len, unichar, i; |
322 | ||
323 | assert(str); | |
02a36bc9 DR |
324 | |
325 | len = utf8_encoded_expected_len(str); | |
326 | if (len == 0) | |
7e8185ef | 327 | return -EINVAL; |
02a36bc9 DR |
328 | |
329 | /* ascii is valid */ | |
330 | if (len == 1) | |
331 | return 1; | |
332 | ||
333 | /* check if expected encoded chars are available */ | |
334 | for (i = 0; i < len; i++) | |
335 | if ((str[i] & 0x80) != 0x80) | |
7e8185ef | 336 | return -EINVAL; |
02a36bc9 DR |
337 | |
338 | unichar = utf8_encoded_to_unichar(str); | |
339 | ||
340 | /* check if encoded length matches encoded value */ | |
341 | if (utf8_unichar_to_encoded_len(unichar) != len) | |
7e8185ef | 342 | return -EINVAL; |
02a36bc9 DR |
343 | |
344 | /* check if value has valid range */ | |
345 | if (!is_unicode_valid(unichar)) | |
7e8185ef | 346 | return -EINVAL; |
02a36bc9 DR |
347 | |
348 | return len; | |
349 | } |