1 /* 2 * Copyright 2009,2010 Red Hat, Inc. 3 * Copyright 2011,2012 Google, Inc. 4 * 5 * This is part of HarfBuzz, a text shaping library. 6 * 7 * Permission is hereby granted, without written agreement and without 8 * license or royalty fees, to use, copy, modify, and distribute this 9 * software and its documentation for any purpose, provided that the 10 * above copyright notice and the following two paragraphs appear in 11 * all copies of this software. 12 * 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 17 * DAMAGE. 18 * 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 24 * 25 * Red Hat Author(s): Behdad Esfahbod 26 * Google Author(s): Behdad Esfahbod 27 */ 28 29 #include "hb-private.hh" 30 31 #include "hb-mutex-private.hh" 32 #include "hb-object-private.hh" 33 34 #include <locale.h> 35 36 37 /* hb_options_t */ 38 39 hb_options_union_t _hb_options; 40 41 void 42 _hb_options_init (void) 43 { 44 hb_options_union_t u; 45 u.i = 0; 46 u.opts.initialized = 1; 47 48 char *c = getenv ("HB_OPTIONS"); 49 u.opts.uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible"); 50 51 /* This is idempotent and threadsafe. */ 52 _hb_options = u; 53 } 54 55 56 /* hb_tag_t */ 57 58 /** 59 * hb_tag_from_string: 60 * @str: (array length=len): 61 * @len: 62 * 63 * 64 * 65 * Return value: 66 * 67 * Since: 1.0 68 **/ 69 hb_tag_t 70 hb_tag_from_string (const char *str, int len) 71 { 72 char tag[4]; 73 unsigned int i; 74 75 if (!str || !len || !*str) 76 return HB_TAG_NONE; 77 78 if (len < 0 || len > 4) 79 len = 4; 80 for (i = 0; i < (unsigned) len && str[i]; i++) 81 tag[i] = str[i]; 82 for (; i < 4; i++) 83 tag[i] = ' '; 84 85 return HB_TAG_CHAR4 (tag); 86 } 87 88 /** 89 * hb_tag_to_string: 90 * @tag: 91 * @buf: (array fixed-size=4): 92 * 93 * 94 * 95 * Since: 1.0 96 **/ 97 void 98 hb_tag_to_string (hb_tag_t tag, char *buf) 99 { 100 buf[0] = (char) (uint8_t) (tag >> 24); 101 buf[1] = (char) (uint8_t) (tag >> 16); 102 buf[2] = (char) (uint8_t) (tag >> 8); 103 buf[3] = (char) (uint8_t) (tag >> 0); 104 } 105 106 107 /* hb_direction_t */ 108 109 const char direction_strings[][4] = { 110 "ltr", 111 "rtl", 112 "ttb", 113 "btt" 114 }; 115 116 /** 117 * hb_direction_from_string: 118 * @str: (array length=len): 119 * @len: 120 * 121 * 122 * 123 * Return value: 124 * 125 * Since: 1.0 126 **/ 127 hb_direction_t 128 hb_direction_from_string (const char *str, int len) 129 { 130 if (unlikely (!str || !len || !*str)) 131 return HB_DIRECTION_INVALID; 132 133 /* Lets match loosely: just match the first letter, such that 134 * all of "ltr", "left-to-right", etc work! 135 */ 136 char c = TOLOWER (str[0]); 137 for (unsigned int i = 0; i < ARRAY_LENGTH (direction_strings); i++) 138 if (c == direction_strings[i][0]) 139 return (hb_direction_t) (HB_DIRECTION_LTR + i); 140 141 return HB_DIRECTION_INVALID; 142 } 143 144 /** 145 * hb_direction_to_string: 146 * @direction: 147 * 148 * 149 * 150 * Return value: (transfer none): 151 * 152 * Since: 1.0 153 **/ 154 const char * 155 hb_direction_to_string (hb_direction_t direction) 156 { 157 if (likely ((unsigned int) (direction - HB_DIRECTION_LTR) 158 < ARRAY_LENGTH (direction_strings))) 159 return direction_strings[direction - HB_DIRECTION_LTR]; 160 161 return "invalid"; 162 } 163 164 165 /* hb_language_t */ 166 167 struct hb_language_impl_t { 168 const char s[1]; 169 }; 170 171 static const char canon_map[256] = { 172 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 173 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 174 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '-', 0, 0, 175 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 0, 0, 0, 0, 0, 0, 176 '-', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 177 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, '-', 178 0, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 179 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, 0 180 }; 181 182 static hb_bool_t 183 lang_equal (hb_language_t v1, 184 const void *v2) 185 { 186 const unsigned char *p1 = (const unsigned char *) v1; 187 const unsigned char *p2 = (const unsigned char *) v2; 188 189 while (*p1 && *p1 == canon_map[*p2]) 190 p1++, p2++; 191 192 return *p1 == canon_map[*p2]; 193 } 194 195 #if 0 196 static unsigned int 197 lang_hash (const void *key) 198 { 199 const unsigned char *p = key; 200 unsigned int h = 0; 201 while (canon_map[*p]) 202 { 203 h = (h << 5) - h + canon_map[*p]; 204 p++; 205 } 206 207 return h; 208 } 209 #endif 210 211 212 struct hb_language_item_t { 213 214 struct hb_language_item_t *next; 215 hb_language_t lang; 216 217 inline bool operator == (const char *s) const { 218 return lang_equal (lang, s); 219 } 220 221 inline hb_language_item_t & operator = (const char *s) { 222 lang = (hb_language_t) strdup (s); 223 for (unsigned char *p = (unsigned char *) lang; *p; p++) 224 *p = canon_map[*p]; 225 226 return *this; 227 } 228 229 void finish (void) { free ((void *) lang); } 230 }; 231 232 233 /* Thread-safe lock-free language list */ 234 235 static hb_language_item_t *langs; 236 237 #ifdef HAVE_ATEXIT 238 static inline 239 void free_langs (void) 240 { 241 while (langs) { 242 hb_language_item_t *next = langs->next; 243 langs->finish (); 244 free (langs); 245 langs = next; 246 } 247 } 248 #endif 249 250 static hb_language_item_t * 251 lang_find_or_insert (const char *key) 252 { 253 retry: 254 hb_language_item_t *first_lang = (hb_language_item_t *) hb_atomic_ptr_get (&langs); 255 256 for (hb_language_item_t *lang = first_lang; lang; lang = lang->next) 257 if (*lang == key) 258 return lang; 259 260 /* Not found; allocate one. */ 261 hb_language_item_t *lang = (hb_language_item_t *) calloc (1, sizeof (hb_language_item_t)); 262 if (unlikely (!lang)) 263 return NULL; 264 lang->next = first_lang; 265 *lang = key; 266 267 if (!hb_atomic_ptr_cmpexch (&langs, first_lang, lang)) { 268 free (lang); 269 goto retry; 270 } 271 272 #ifdef HAVE_ATEXIT 273 if (!first_lang) 274 atexit (free_langs); /* First person registers atexit() callback. */ 275 #endif 276 277 return lang; 278 } 279 280 281 /** 282 * hb_language_from_string: 283 * @str: (array length=len): 284 * @len: 285 * 286 * 287 * 288 * Return value: 289 * 290 * Since: 1.0 291 **/ 292 hb_language_t 293 hb_language_from_string (const char *str, int len) 294 { 295 char strbuf[64]; 296 297 if (!str || !len || !*str) 298 return HB_LANGUAGE_INVALID; 299 300 if (len >= 0) 301 { 302 /* NUL-terminate it. */ 303 len = MIN (len, (int) sizeof (strbuf) - 1); 304 memcpy (strbuf, str, len); 305 strbuf[len] = '\0'; 306 str = strbuf; 307 } 308 309 hb_language_item_t *item = lang_find_or_insert (str); 310 311 return likely (item) ? item->lang : HB_LANGUAGE_INVALID; 312 } 313 314 /** 315 * hb_language_to_string: 316 * @language: 317 * 318 * 319 * 320 * Return value: (transfer none): 321 * 322 * Since: 1.0 323 **/ 324 const char * 325 hb_language_to_string (hb_language_t language) 326 { 327 /* This is actually NULL-safe! */ 328 return language->s; 329 } 330 331 /** 332 * hb_language_get_default: 333 * 334 * 335 * 336 * Return value: 337 * 338 * Since: 1.0 339 **/ 340 hb_language_t 341 hb_language_get_default (void) 342 { 343 static hb_language_t default_language = HB_LANGUAGE_INVALID; 344 345 hb_language_t language = (hb_language_t) hb_atomic_ptr_get (&default_language); 346 if (unlikely (language == HB_LANGUAGE_INVALID)) { 347 language = hb_language_from_string (setlocale (LC_CTYPE, NULL), -1); 348 hb_atomic_ptr_cmpexch (&default_language, HB_LANGUAGE_INVALID, language); 349 } 350 351 return default_language; 352 } 353 354 355 /* hb_script_t */ 356 357 /** 358 * hb_script_from_iso15924_tag: 359 * @tag: 360 * 361 * 362 * 363 * Return value: 364 * 365 * Since: 1.0 366 **/ 367 hb_script_t 368 hb_script_from_iso15924_tag (hb_tag_t tag) 369 { 370 if (unlikely (tag == HB_TAG_NONE)) 371 return HB_SCRIPT_INVALID; 372 373 /* Be lenient, adjust case (one capital letter followed by three small letters) */ 374 tag = (tag & 0xDFDFDFDFu) | 0x00202020u; 375 376 switch (tag) { 377 378 /* These graduated from the 'Q' private-area codes, but 379 * the old code is still aliased by Unicode, and the Qaai 380 * one in use by ICU. */ 381 case HB_TAG('Q','a','a','i'): return HB_SCRIPT_INHERITED; 382 case HB_TAG('Q','a','a','c'): return HB_SCRIPT_COPTIC; 383 384 /* Script variants from http://unicode.org/iso15924/ */ 385 case HB_TAG('C','y','r','s'): return HB_SCRIPT_CYRILLIC; 386 case HB_TAG('L','a','t','f'): return HB_SCRIPT_LATIN; 387 case HB_TAG('L','a','t','g'): return HB_SCRIPT_LATIN; 388 case HB_TAG('S','y','r','e'): return HB_SCRIPT_SYRIAC; 389 case HB_TAG('S','y','r','j'): return HB_SCRIPT_SYRIAC; 390 case HB_TAG('S','y','r','n'): return HB_SCRIPT_SYRIAC; 391 } 392 393 /* If it looks right, just use the tag as a script */ 394 if (((uint32_t) tag & 0xE0E0E0E0u) == 0x40606060u) 395 return (hb_script_t) tag; 396 397 /* Otherwise, return unknown */ 398 return HB_SCRIPT_UNKNOWN; 399 } 400 401 /** 402 * hb_script_from_string: 403 * @s: (array length=len): 404 * @len: 405 * 406 * 407 * 408 * Return value: 409 * 410 * Since: 1.0 411 **/ 412 hb_script_t 413 hb_script_from_string (const char *s, int len) 414 { 415 return hb_script_from_iso15924_tag (hb_tag_from_string (s, len)); 416 } 417 418 /** 419 * hb_script_to_iso15924_tag: 420 * @script: 421 * 422 * 423 * 424 * Return value: 425 * 426 * Since: 1.0 427 **/ 428 hb_tag_t 429 hb_script_to_iso15924_tag (hb_script_t script) 430 { 431 return (hb_tag_t) script; 432 } 433 434 /** 435 * hb_script_get_horizontal_direction: 436 * @script: 437 * 438 * 439 * 440 * Return value: 441 * 442 * Since: 1.0 443 **/ 444 hb_direction_t 445 hb_script_get_horizontal_direction (hb_script_t script) 446 { 447 /* http://goo.gl/x9ilM */ 448 switch ((hb_tag_t) script) 449 { 450 /* Unicode-1.1 additions */ 451 case HB_SCRIPT_ARABIC: 452 case HB_SCRIPT_HEBREW: 453 454 /* Unicode-3.0 additions */ 455 case HB_SCRIPT_SYRIAC: 456 case HB_SCRIPT_THAANA: 457 458 /* Unicode-4.0 additions */ 459 case HB_SCRIPT_CYPRIOT: 460 461 /* Unicode-4.1 additions */ 462 case HB_SCRIPT_KHAROSHTHI: 463 464 /* Unicode-5.0 additions */ 465 case HB_SCRIPT_PHOENICIAN: 466 case HB_SCRIPT_NKO: 467 468 /* Unicode-5.1 additions */ 469 case HB_SCRIPT_LYDIAN: 470 471 /* Unicode-5.2 additions */ 472 case HB_SCRIPT_AVESTAN: 473 case HB_SCRIPT_IMPERIAL_ARAMAIC: 474 case HB_SCRIPT_INSCRIPTIONAL_PAHLAVI: 475 case HB_SCRIPT_INSCRIPTIONAL_PARTHIAN: 476 case HB_SCRIPT_OLD_SOUTH_ARABIAN: 477 case HB_SCRIPT_OLD_TURKIC: 478 case HB_SCRIPT_SAMARITAN: 479 480 /* Unicode-6.0 additions */ 481 case HB_SCRIPT_MANDAIC: 482 483 /* Unicode-6.1 additions */ 484 case HB_SCRIPT_MEROITIC_CURSIVE: 485 case HB_SCRIPT_MEROITIC_HIEROGLYPHS: 486 487 /* Unicode-7.0 additions */ 488 case HB_SCRIPT_MANICHAEAN: 489 case HB_SCRIPT_MENDE_KIKAKUI: 490 case HB_SCRIPT_NABATAEAN: 491 case HB_SCRIPT_OLD_NORTH_ARABIAN: 492 case HB_SCRIPT_PALMYRENE: 493 case HB_SCRIPT_PSALTER_PAHLAVI: 494 495 return HB_DIRECTION_RTL; 496 } 497 498 return HB_DIRECTION_LTR; 499 } 500 501 502 /* hb_user_data_array_t */ 503 504 bool 505 hb_user_data_array_t::set (hb_user_data_key_t *key, 506 void * data, 507 hb_destroy_func_t destroy, 508 hb_bool_t replace) 509 { 510 if (!key) 511 return false; 512 513 if (replace) { 514 if (!data && !destroy) { 515 items.remove (key, lock); 516 return true; 517 } 518 } 519 hb_user_data_item_t item = {key, data, destroy}; 520 bool ret = !!items.replace_or_insert (item, lock, replace); 521 522 return ret; 523 } 524 525 void * 526 hb_user_data_array_t::get (hb_user_data_key_t *key) 527 { 528 hb_user_data_item_t item = {NULL }; 529 530 return items.find (key, &item, lock) ? item.data : NULL; 531 } 532 533 534 /* hb_version */ 535 536 /** 537 * hb_version: 538 * @major: (out): Library major version component. 539 * @minor: (out): Library minor version component. 540 * @micro: (out): Library micro version component. 541 * 542 * Returns library version as three integer components. 543 * 544 * Since: 1.0 545 **/ 546 void 547 hb_version (unsigned int *major, 548 unsigned int *minor, 549 unsigned int *micro) 550 { 551 *major = HB_VERSION_MAJOR; 552 *minor = HB_VERSION_MINOR; 553 *micro = HB_VERSION_MICRO; 554 } 555 556 /** 557 * hb_version_string: 558 * 559 * Returns library version as a string with three components. 560 * 561 * Return value: library version string. 562 * 563 * Since: 1.0 564 **/ 565 const char * 566 hb_version_string (void) 567 { 568 return HB_VERSION_STRING; 569 } 570 571 /** 572 * hb_version_atleast: 573 * @major: 574 * @minor: 575 * @micro: 576 * 577 * 578 * 579 * Return value: 580 * 581 * Since: 1.0 582 **/ 583 hb_bool_t 584 hb_version_atleast (unsigned int major, 585 unsigned int minor, 586 unsigned int micro) 587 { 588 return HB_VERSION_ATLEAST (major, minor, micro); 589 } 590
